JP2014195335A - Non-contact power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system capable of reducing the possibility of undesired influence given to electric loads.SOLUTION: A non-contact power transmission system 1 includes: a power transmission unit 100; and a power receiver 200. The power transmission unit 100 has a power transmission circuit 110, a power transmission control section 120 and a power transmission detection section 130. The power receiver 200 has a power reception circuit 210, a power reception control section 220 and a power reception detection section 230. The power reception detection section 230 detects a voltage before rectification which is a voltage of the power before being rectified by the power reception circuit 210 and a voltage after rectification which is a voltage of the power after being rectified by the power reception circuit 210. The power reception control section 220 operates based on the voltage after rectification to control the power supply. The power supply control supplies the power which the power reception circuit 210 receives from the power transmission circuit 110 to an electric load 3. The power transmission control section 120 selects to carry out/stop the power supply control on the basis of the voltage before rectification or the voltage after rectification.

Description

  The present invention relates to a contactless power transmission system.

A conventional non-contact power transmission system includes a power transmission device and a power reception device.
The power reception device includes a power reception circuit unit, a power reception control unit, and a power reception detection unit. The power reception circuit unit rectifies the power received from the power transmission device. The power reception detection unit detects a pre-rectification voltage that is a voltage before rectification in the power reception circuit unit or a post-rectification voltage that is a voltage after rectification in the power reception circuit unit. The power reception control unit is driven based on the rectified voltage and executes power supply control. The power reception control unit supplies power rectified by the power reception circuit unit to the electric load unit in the power supply control. The power reception control unit executes power reception communication control in conjunction with power supply control. The power reception control unit outputs a response signal according to the signal received from the power transmission device in the power reception communication control. Note that Patent Document 1 discloses an example of a conventional non-contact power transmission system.

JP 2011-205867 A

The inventor of the present application has found that the conventional non-contact power transmission system has the following problems.
The power receiving device may not be able to receive a preferred amount of power from the power transmitting device. The reason is, for example, the following three points. The first reason indicates that the position of the power receiving device with respect to the power transmitting device is shifted from the normal position. The second reason indicates that a metal foreign object exists between the power transmission device and the power reception device. The third reason indicates that the power transmission performance of the power transmission device has decreased due to deterioration over time of the power transmission device. The power receiving device may not be able to receive a preferred amount of power from the power transmitting device due to at least one of these exemplified reasons.

  The rectified voltage decreases as the power received by the power receiving circuit unit from the power transmission device decreases. In addition, the rectified voltage is lowered when the power receiving device outputs a response signal. Since the power reception control unit operates based on the rectified voltage, the operation may stop due to the operation of the power receiving device when the rectified voltage is low. As an example, the power reception control unit stops operating in the following situation. When the response signal is output in a state where the voltage after rectification is low, the rectified voltage may be lower than the start-up voltage of the power reception control unit due to a decrease in the voltage accompanying the output of the response signal. For this reason, the power reception control unit stops the operation when the activation voltage is not input. The power supply control is stopped when the operation of the power reception control unit is stopped.

  On the other hand, the power transmission device continues to transmit power. For this reason, immediately after the power supply control of the power reception control unit stops, the rectified voltage exceeds the activation voltage of the power reception control unit by the power received by the power reception circuit unit from the power reception device. For this reason, the power reception control unit starts operation again, and starts power supply control and power reception communication control.

  When the state in which the power receiving device cannot receive the preferred amount of power from the power transmitting device continues, the rectified current falls below the activation voltage of the power receiving control unit again when the power receiving device outputs a response signal. For this reason, the power reception control unit stops the operation again when the activation voltage is not input. For this reason, the power supply control is also stopped again. After the power reception control unit stops operating, the power reception control unit re-operation, response signal output, power reception control unit and power supply control re-stop, and power reception control unit re-operation are repeated as described above. .

  Then, the operation of the electric control unit and the stop of the power supply control and the re-operation of the power reception control unit are repeated, whereby the electric power supplied to the electric load unit shows a pulse-like change. A pulse-like change in power may adversely affect the electric load.

  The present invention has been invented based on the above background, and an object of the present invention is to provide a non-contact power transmission system capable of reducing the possibility of undesirably affecting an electric load portion.

  (1) One form of this means is “a contactless power transmission system, wherein the contactless power transmission system includes a power transmission device and a power reception device, and the power reception device includes a power reception circuit unit, a power reception control unit, and A power reception detection unit, wherein the power reception detection unit is at least one of a pre-rectification voltage that is a voltage of power before rectification in the power reception circuit unit and a post-rectification voltage that is a voltage of power after rectification in the power reception circuit unit The power reception control unit is driven based on the rectified voltage to execute power supply control, and the power supply control is configured to supply the electric power received by the power reception circuit unit from the power transmission device to the electric load unit. And a non-contact power transmission system in which execution or stop of the power supply control is selected based on at least one of the pre-rectification voltage and the post-rectification voltage.

  (2) One form of the above means is that “the power supply control is selected to execute or stop the power supply control based on a comparison result between the pre-rectification voltage or the post-rectification voltage and a reference voltage. Includes "contactless power transmission system".

  (3) One form of the above means is that the power reception detection unit outputs at least one of a pre-rectification voltage signal indicating the pre-rectification voltage and a post-rectification voltage signal indicating the post-rectification voltage to the power reception control unit, The power supply control includes a non-contact power transmission system in which execution or stop of the power supply control is selected based on a result of comparison between the voltage signal before rectification or the voltage signal after rectification and the reference voltage. .

  (4) One form of the above means is that “the power receiving device has a function of receiving power from one type of the power transmitting device, executes information response control for transmitting a power receiving device signal to the power transmitting device, and The supply control includes a non-contact power transmission system in which execution or stop of the power supply control is selected in a period until the information response control is completed.

  (5) One form of the above means is that “the power receiving device has a function of receiving power from a plurality of types of the power transmission devices, executes information response control for transmitting a power receiving device signal to the power transmission device, and The power supply control includes a “contactless power transmission system in which execution or stop of the power supply control is selected based on the power receiving device signal”.

  (6) One form of the above means is that “the power receiving device has a function of receiving power from a plurality of types of the power transmitting devices, and performs information response control for transmitting a power receiving device signal to the power transmitting device, The power supply control includes a non-contact power transmission system in which execution or stop of the power supply control is selected in a period until the information response control is completed.

This non-contact power transmission system has the following operations and effects.
The power reception control unit is driven based on the rectified voltage. The post-rectification voltage changes according to the pre-rectification voltage. For this reason, the voltage before rectification and the voltage after rectification can be used as information for confirming the possibility that the voltage after rectification is lower than the activation voltage of the power reception control unit. On the other hand, when the power supply control is stopped, the electric load unit is not supplied with power from the power receiving device. For this reason, when the operation of the power reception control unit is stopped in a state where the power supply control is stopped, the power supplied to the electric load unit does not substantially change before and after the operation of the power reception control unit is stopped. .

  Based on this, the non-contact power transmission system selects execution or stop of power supply control based on at least one of the pre-rectification voltage and the post-rectification voltage. For this reason, when there is a possibility that the operation of the power reception control unit will stop due to the operation of the power reception device, which is suggested by the voltage before rectification or the voltage after rectification, the contactless power transmission system stops the operation of the power reception control unit The power supply control can be stopped before starting. For this reason, when the power reception control unit is executing power supply control, the possibility that the operation of the power reception control unit stops is reduced. For this reason, it is suppressed that the electric power supplied to an electric load part changes like a pulse. For this reason, this non-contact electric power transmission system can suppress having an unfavorable influence on an electric load part.

  This non-contact power transmission system can reduce the possibility of undesirably affecting the electric load portion.

The block diagram of the non-contact electric power transmission system of 1st Embodiment. The flowchart of the power transmission authentication control of 1st Embodiment. The time chart regarding operation | movement of the non-contact electric power transmission system of 1st Embodiment. The time chart regarding operation | movement of the non-contact electric power transmission system of 1st Embodiment. The time chart regarding operation | movement of a 1st comparison transmission system. The time chart regarding operation | movement of a 2nd comparison transmission system.

(First embodiment)
The non-contact power transmission system 1 has the configuration shown in FIG. The non-contact power transmission system 1 is incorporated in a rechargeable small electric product as an example. The rechargeable small electric product includes a charging device and a main device. As an example, the main body device is an electric toothbrush, an electric razor, a mobile phone, a digital camera, a digital video camera, or a notebook personal computer. The non-contact power transmission system 1 includes a power transmission device 100 and a power reception device 200.

  The power transmission device 100 forms a charging device for a small electrical product. The power transmission device 100 is driven by AC power supplied from the commercial AC power supply 2. The power transmission device 100 corresponds to one type of power reception device 200. The power transmission device 100 can transmit power to the corresponding one type of power reception device 200. The power transmission device 100 does not transmit power to a power receiving device other than the corresponding one type of power receiving device 200.

  The power transmission device 100 includes a plurality of components and a plurality of functional blocks. The plurality of components of the power transmission device 100 includes a casing component 101, a power transmission coil 111, and a resonance capacitor 112. The plurality of functional blocks of the power transmission device 100 includes a power transmission circuit unit 110, a power transmission control unit 120, a power transmission detection unit 130, and a power supply circuit unit 140.

  The casing component 101 accommodates a plurality of elements constituting a plurality of functional blocks in an internal space. The casing component 101 has an installation part 102. The installation unit 102 has a structure for installing the power receiving device 200.

  The power receiving device 200 forms a main device of a small electrical product. The power receiving device 200 supplies power to the secondary battery as the electric load unit 3. The power receiving device 200 has a structure that can be coupled to and separated from the electric load unit 3.

  The power receiving device 200 includes a plurality of components and a plurality of functional blocks. The plurality of components of the power receiving device 200 includes a casing component 201, a power receiving coil 211, and a resonance capacitor 212. The plurality of functional blocks of the power reception device 200 includes a power reception circuit unit 210, a power reception control unit 220, a power reception detection unit 230, and a power adjustment unit 240.

  The casing component 201 accommodates a plurality of elements constituting a plurality of functional blocks in an internal space. The casing component 201 has a facing portion 202. The facing unit 202 faces the installation unit 102 when the power receiving device 200 is installed in the installation unit 102 of the power transmission device 100.

  The non-contact power transmission system 1 charges the power receiving device 200 by non-contact power transmission of the power transmission device 100. When the power receiving device 200 is installed in the installation unit 102, the power receiving device 200 is charged with the power transmitted from the power transmitting device 100. When the power receiving apparatus 200 is installed in the installation unit 102, the power reception device 200 can take a normal position or a non-regular position with respect to the installation unit 102.

  The normal position of the power receiving device 200 indicates a position where the facing portion 202 faces a location in the specified range in the installation portion 102. As an example, the normal position of the power receiving device 200 can be defined by the positional relationship between the central axis of the power transmission coil 111 and the central axis of the power receiving coil 211. As an example, the normal position of the power receiving device 200 indicates a position where the central axis of the power receiving coil 211 intersects with a virtual circle around the central axis of the power transmitting coil 111. This virtual circle is centered on the central axis of the power transmission coil 111 and has a certain radius.

  The non-regular position of the power receiving device 200 indicates a position where at least a part of the facing portion 202 does not face a specified range in the installation portion 102. As an example, the non-regular position of the power receiving device 200 can be defined by the positional relationship between the central axis of the power transmitting coil 111 and the central axis of the power receiving coil 211. As an example, the non-regular position of the power receiving device 200 indicates a position where the central axis of the power receiving coil 211 does not intersect the virtual circle around the central axis of the power transmitting coil 111.

  The non-contact power transmission system 1 can obtain a preferable charging efficiency when the power receiving device 200 takes a normal position and when the power transmission from the power transmitting device 100 to the power receiving device 200 is not hindered by the metal foreign object. In the non-contact power transmission system 1, when the power receiving device 200 takes a non-regular position, there is a high possibility that preferable charging efficiency cannot be obtained.

Each functional block of the power transmission device 100 has the following configuration.
The power supply circuit unit 140 includes a plurality of circuit elements. The power supply circuit unit 140 receives AC power from the commercial AC power supply 2. The power supply circuit unit 140 converts AC power into DC power and outputs a constant DC voltage. The output voltage of the power supply circuit unit 140 is input to the power transmission circuit unit 110, the power transmission control unit 120, and the power transmission detection unit 130.

  The power transmission circuit unit 110 includes a plurality of circuit elements. The power transmission circuit unit 110 includes a power transmission coil 111 and a resonance capacitor 112. The power transmission circuit unit 110 forms a series resonance circuit by the power transmission coil 111 and the resonance capacitor 112. The power transmission circuit unit 110 controls a switching element (not shown) based on the voltage signal output from the power transmission control unit 120. The power transmission circuit unit 110 controls the current flowing through the power transmission coil 111 by using a switching element. The power transmission circuit unit 110 supplies a high-frequency current to the power transmission coil 111 by controlling the switching element. The power transmission coil 111 generates a high-frequency magnetic flux when supplied with a high-frequency current. The power transmission circuit unit 110 transmits power to the power reception circuit unit 210 by electromagnetic induction action of high-frequency magnetic flux generated by the power transmission coil 111.

  The power transmission circuit unit 110 has at least a preparation mode and a production mode as power transmission modes. The power transmission circuit unit 110 changes the power transmission mode based on the voltage signal output from the power transmission control unit 120.

  The power transmission circuit unit 110 intermittently supplies a high-frequency current to the power transmission coil 111 in the preparation mode. The power transmission circuit unit 110 intermittently supplies a high-frequency current to the power transmission coil 111 by alternately repeating a period for supplying a current to the power transmission coil 111 and a period for not supplying a current to the power transmission coil 111. The power transmission circuit unit 110 outputs minute power from the power transmission coil 111 in the preparation mode.

  The power transmission circuit unit 110 continuously supplies a high-frequency current to the power transmission coil 111 in the production mode. The power transmission circuit unit 110 outputs power larger than that in the preparation mode by the power transmission coil 111 in the production mode. The power transmission circuit unit 110 supplies a high-frequency current of 200 kHz to the power transmission coil 111 as an example of the production mode.

  The power transmission control unit 120 includes a plurality of circuit elements. The power transmission control unit 120 performs power transmission device control for controlling the operation of the power transmission device 100. The power transmission control unit 120 controls the power transmission mode of the power transmission circuit unit 110 and the transmission mode of the power transmission device signal ST of the power transmission circuit unit 110 by power transmission device control. The power transmission device signal ST indicates a signal output from the power transmission device 100 as electric power. The power transmission device signal ST includes one or more signals.

  The power transmission detection unit 130 includes a plurality of circuit elements. The power transmission detection unit 130 detects the voltage of the power transmission circuit unit 110 (hereinafter, “power transmission voltage VT”), and outputs the detected power transmission voltage VT to the power transmission control unit 120. The power transmission detection unit 130 detects the voltage of the terminal on the resonance capacitor 112 side in the power transmission coil 111 as an example of the power transmission voltage VT. The power transmission voltage VT includes the power reception device signal SR received by the power transmission circuit unit 110 from the power reception circuit unit 210. Therefore, the power transmission detection unit 130 detects the power reception device signal SR by detecting the power transmission voltage VT. The power receiving device signal SR indicates a signal output as electric power from the power receiving device 200. The power receiving device signal SR includes one or more signals.

Each functional block of the power receiving apparatus 200 has the following configuration.
The power receiving circuit unit 210 includes a plurality of circuit elements. The power receiving circuit unit 210 includes a power receiving coil 211 and a resonance capacitor 212. The power receiving circuit unit 210 generates high frequency induction power by receiving the high frequency magnetic flux generated by the power transmission circuit unit 110 by the power receiving coil 211. The power reception circuit unit 210 rectifies the high-frequency induced electromotive force generated by the power reception coil 211 and outputs the rectified DC power to the power reception control unit 220 and the power adjustment unit 240. The power reception circuit unit 210 outputs a power reception device signal SR based on the voltage signal output from the power reception control unit 220.

  The power reception detection unit 230 includes a plurality of circuit elements. The power reception detection unit 230 detects a voltage before rectification in the power reception circuit unit 210 (hereinafter referred to as “pre-rectification voltage VRF”), and outputs the pre-rectification voltage VRF to the power reception control unit 220. The power reception detection unit 230 detects the voltage after rectification in the power reception circuit unit 210 (hereinafter, “rectified voltage VRR”), and outputs the rectified voltage VRR to the power reception control unit 220. The power reception detection unit 230 detects the voltage of power adjusted by the power adjustment unit 240 (hereinafter, “load input voltage VL”), and outputs the detected load input voltage VL to the power reception control unit 220. The power reception detection unit 230 detects the current of the electric power after adjustment in the power adjustment unit 240 (hereinafter, “load input current IL”), and outputs the detected load input current IL to the power reception control unit 220.

  The pre-rectification voltage VRF includes the power transmission device signal ST received by the power reception circuit unit 210 from the power transmission circuit unit 110. For this reason, the power reception detection unit 230 detects the power transmission device signal ST by detecting the pre-rectification voltage VRF. The rectified voltage VRR includes the power transmission device signal ST received by the power reception circuit unit 210 from the power transmission circuit unit 110. For this reason, the power reception detection unit 230 detects the power transmission device signal ST by detecting the rectified voltage VRR. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to the impedance of the power receiving circuit unit 210.

  The power reception control unit 220 includes a plurality of circuit elements. The power reception control unit 220 performs power reception device control for controlling the operation of the power reception device 200. The power reception control unit 220 controls the transmission mode of the power reception device signal SR of the power reception circuit unit 210 and the supply mode of power to the electric load unit 3 by the power adjustment unit 240 by power reception device control. The power reception control unit 220 operates based on the rectified voltage VRR. The power reception control unit 220 is maintained in a power-on state when the rectified voltage VRR is equal to or higher than the activation voltage VD of the power reception control unit 220.

  The power adjustment unit 240 includes a plurality of circuit elements. The power adjustment unit 240 receives the DC power rectified by the power reception circuit unit 210. The power adjustment unit 240 adjusts the DC power received from the power reception circuit unit 210 to a constant voltage, and supplies the adjusted DC power to the electric load unit 3. The power adjustment unit 240 charges the electric load unit 3 by supplying DC power to the electric load unit 3.

The power transmission device control and the power reception device control have the following contents.
The power transmission control unit 120 performs frequency modulation control, power transmission authentication control, power transmission control, and power transmission communication control as power transmission device control. The power transmission control unit 120 starts power transmission authentication control when the power transmission control unit 120 changes from the power-off state to the power-on state. The power transmission control unit 120 performs installation determination control, information confirmation control, and supply permission control in power transmission authentication control.

  The power transmission control unit 120 starts the information confirmation control based on the completion of the installation determination control, starts the supply permission control based on the completion of the information confirmation control, and based on the completion of the supply permission control. Complete power transmission authentication control. The power transmission control unit 120 starts power transmission control and power transmission communication control based on the completion of power transmission authentication control. When the power transmission circuit unit 110 receives the stop request signal SRC, the power transmission control unit 120 stops the power transmission control and the power transmission communication control based on the stop request signal SRC.

  The power transmission control unit 120 performs frequency modulation control when the power transmission circuit unit 110 outputs the power transmission device signal ST in power transmission authentication control or power transmission communication control. The power transmission control unit 120 causes the power transmission circuit unit 110 to output the power transmission device signal ST by modulating the frequency of the high-frequency magnetic flux generated by the power transmission circuit unit 110 by frequency modulation control.

  The power reception control unit 220 performs load modulation control, power reception authentication control, power supply control, and power reception communication control as power reception device control. The power reception control unit 220 starts power reception authentication control when the power reception control unit 220 changes from a power-off state to a power-on state. The power reception control unit 220 performs information transmission control in power reception authentication control.

  When the power reception circuit unit 210 receives the information request signal STB, the power reception control unit 220 starts information transmission control based on the information request signal STB. When the power reception circuit unit 210 receives the supply enable signal STD, the power reception control unit 220 starts power supply control and power reception communication control based on the supply enable signal STD. The power reception control unit 220 stops the power supply control based on the fact that the load input current IL indicates a magnitude smaller than the supply stop current ILX.

  The power reception control unit 220 performs load modulation control when the power reception circuit unit 210 outputs the power reception device signal SR in power reception authentication control or power reception communication control. The power reception control unit 220 causes the power reception circuit unit 210 to output the power reception device signal SR by changing the impedance of the power reception circuit unit 210 by load modulation control.

The installation determination control has the following contents.
The installation determination control indicates control for determining whether or not the power receiving device 200 is installed in the installation unit 102. The power transmission device 100 operates as follows in the installation determination control. The power transmission control unit 120 outputs a voltage signal to the power transmission circuit unit 110. This voltage signal includes information for causing the power transmission coil 111 to output constant power in the preparation mode. Based on the voltage signal output from the power transmission control unit 120, the power transmission circuit unit 110 outputs constant power from the power transmission coil 111 in the preparation mode.

  The power transmission voltage VT is lower when the power receiving device 200 has a regular position or a non-regular position than when the power receiving device 200 is not installed in the installation unit 102. The power transmission control unit 120 determines whether or not the power transmission voltage VT is equal to or lower than the installation determination voltage VS. The power transmission control unit 120 determines that the power receiving device 200 has the normal position or the non-normal position when the power transmission voltage VT is equal to or lower than the installation determination voltage VS. The power transmission control unit 120 starts information confirmation control based on the fact that the power transmission voltage VT has a magnitude equal to or lower than the installation determination voltage VS.

The information confirmation control and the information response control have the following contents.
The information confirmation control indicates control for determining whether or not the power receiving device 200 is a device corresponding to the standard of the power transmitting device 100. The information confirmation control includes a first stage and a second stage. The information confirmation control shifts to the later stage after passing through the earlier stage.

  The power transmission device 100 operates as follows in the first stage of information confirmation control. The power transmission control unit 120 outputs a voltage signal to the power transmission circuit unit 110. This voltage signal includes information for causing the power transmission coil 111 to output the information request signal STB in the preparation mode. Based on the voltage signal output from the power transmission control unit 120, the power transmission circuit unit 110 causes the power transmission coil 111 to output the power transmission device signal ST including the information request signal STB.

  The information response control indicates control for outputting the power receiving device signal SRA based on the information request signal STB. The information response control includes a first stage and a second stage. Information response control shifts to the later stage after passing through the earlier stage.

  The power receiving device 200 operates as follows in the first stage of information response control. The power receiving circuit unit 210 receives the power transmitting device signal ST output from the power transmitting circuit unit 110 when the power receiving device 200 has the normal position or the non-normal position.

  The power reception detection unit 230 detects the pre-rectification voltage VRF. The pre-rectification voltage VRF includes the power transmission device signal ST received by the power reception circuit unit 210. The power transmission device signal ST includes an information request signal STB. The power reception detection unit 230 outputs the pre-rectification voltage VRF including the information request signal STB to the power reception control unit 220.

  The power reception control unit 220 outputs a voltage signal to the power reception circuit unit 210 based on the information request signal STB included in the pre-rectification voltage VRF. This voltage signal includes information for causing the power receiving coil 211 to output the power receiving device signal SRA. Based on the voltage signal output from the power reception control unit 220, the power reception circuit unit 210 outputs the power reception device signal SR including the power reception device signal SRA by the power reception coil 211. The power receiving device signal SRA includes information related to the standard of the power receiving device 200.

  The power transmission device 100 operates as follows in the later stage of information confirmation control. The power transmission circuit unit 110 receives the power reception device signal SR output from the power reception circuit unit 210 when the power reception device 200 has a normal position or an irregular position. The power transmission detection unit 130 detects the power transmission voltage VT. The power transmission voltage VT includes the power receiving device signal SR received by the power transmission circuit unit 110. The power receiving device signal SR includes a power receiving device signal SRA. The power transmission detection unit 130 outputs the power transmission voltage VT including the power receiving device signal SRA to the power transmission control unit 120.

  The power transmission control unit 120 compares the power receiving device signal SRA included in the power transmission voltage VT with the power transmitting device signal STE and determines whether the power receiving device 200 is a device corresponding to the power transmitting device 100. The power transmission control unit 120 authenticates that the power receiving device 200 corresponds to the power transmitting device 100 based on the fact that the power receiving device signal SRA matches the power transmitting device signal STE. The power transmission control unit 120 starts supply permission control based on the fact that the power receiving device signal SRA matches the power transmission device signal STE.

  The power reception control unit 220 operates as follows in the later stage of information response control. The power reception control unit 220 stands by in a state where the detection of the information request signal STB, the detection of the supply enable signal STD, and the output of the power receiving device signal SRA based on the information request signal STB are possible.

The supply permission control has the following contents.
The supply permission control indicates control for permitting or denying supply of electric power to the electric load unit 3 in the power receiving device 200. That is, the supply permission control indicates control for selecting execution or stop related to power supply to the electric load unit 3.

  The power transmission device 100 operates as follows in the supply permission control. The power transmission detection unit 130 detects the power transmission voltage VT. The power transmission voltage VT includes a power receiving device signal SR. The power receiving device signal SR includes a pre-rectification voltage signal SRF. The power transmission detection unit 130 outputs the power transmission voltage VT including the pre-rectification voltage signal SRF to the power transmission control unit 120.

  The power transmission control unit 120 compares the pre-rectification voltage signal SRF included in the power transmission voltage VT with the power transmission reference voltage VTX as a reference voltage. When the pre-rectification voltage VRF indicated by the pre-rectification voltage signal SRF is less than the power transmission reference voltage VTX, the power transmission control unit 120 sets the supply negative signal STC on and sets the supply enable signal STD off. The supply negative signal STC indicates that power supply to the electric load unit 3 in the power receiving device 200 is not permitted. When the supply negative signal STC is set to ON, the power transmission control unit 120 continues the comparison between the pre-rectification voltage signal SRF included in the power transmission voltage VT and the power transmission reference voltage VTX.

  When the pre-rectification voltage VRF indicated by the pre-rectification voltage signal SRF is equal to or higher than the power transmission reference voltage VTX, the power transmission control unit 120 sets the supply enable signal STD on and sets the supply negative signal STC off. Supplyable signal STD indicates that power supply to electric load unit 3 in power receiving device 200 is permitted.

  The power transmission control unit 120 outputs a voltage signal to the power transmission circuit unit 110 based on the fact that the supply enabled signal STD is set to ON. This voltage signal includes information for causing the power transmission coil 111 to output the supplyable signal STD and information for causing the power transmission coil 111 to output power in the actual mode. Based on the voltage signal output from the power transmission control unit 120, the power transmission circuit unit 110 causes the power transmission coil 111 to output the power transmission device signal ST including the supplyable signal STD. The power transmission circuit unit 110 outputs constant power from the power transmission coil 111 in the production mode based on the voltage signal output from the power transmission control unit 120.

  The power transmission control unit 120 completes the supply permission control based on the output of the supply enable signal STD from the power transmission circuit unit 110. The power transmission control unit 120 starts power transmission control and power transmission communication control based on the completion of the supply permission control.

  The power receiving device 200 operates as follows in the later stage of information response control. The power receiving circuit unit 210 receives the suppliable signal STD output from the power transmitting circuit unit 110 when the power receiving device 200 has a normal position or a non-normal position.

  The power reception detection unit 230 detects the pre-rectification voltage VRF. The pre-rectification voltage VRF includes the power transmission device signal ST received by the power reception circuit unit 210. The power transmission device signal ST includes a supply enable signal STD. The power reception detection unit 230 outputs the pre-rectification voltage VRF including the supply enable signal STD to the power reception control unit 220. The power reception control unit 220 completes the information response control based on the supply enable signal STD included in the pre-rectification voltage VRF. The power reception control unit 220 starts power supply control and power reception communication control based on the completion of the information response control.

FIG. 2 shows an example of a flowchart of power transmission authentication control.
In step S <b> 11, the power transmission control unit 120 outputs a voltage signal for transmitting power in the preparation mode to the power transmission circuit unit 110. The power transmission circuit unit 110 transmits power in the preparation mode based on the voltage signal received from the power transmission control unit 120.

  In step S12, the power transmission control unit 120 determines whether or not the power transmission voltage VT is equal to or lower than the installation determination voltage VS. When the power transmission voltage VT is higher than the installation determination voltage VS, the power transmission control unit 120 performs the determination in step S12 again. The power transmission control unit 120 proceeds to step S13 when the power transmission voltage VT is equal to or lower than the installation determination voltage VS.

  In step S13, the power transmission control unit 120 outputs a voltage signal for outputting the information request signal STB to the power transmission circuit unit 110. The power transmission circuit unit 110 outputs an information request signal STB based on the voltage signal received from the power transmission control unit 120.

  In step S14, the power transmission control unit 120 determines whether the power receiving device signal SRA is compatible with the power transmitting device signal STE based on the power receiving device signal SRA received by the power transmission circuit unit 110. When the power receiving device signal SRA is not compatible with the power transmitting device signal STE, the power transmission control unit 120 performs the determination in step S12 again. The power transmission control unit 120 proceeds to step S15 when the power receiving device signal SRA matches the power transmission device signal STE.

  In step S15, the power transmission control unit 120 determines whether the pre-rectification voltage VRF is equal to or higher than the supply determination voltage VX based on the pre-rectification voltage signal SRF received by the power transmission circuit unit 110. When the pre-rectification voltage VRF is less than the supply determination voltage VX, the power transmission control unit 120 performs the determination in step S12 again. When the pre-rectification voltage VRF is equal to or higher than the supply determination voltage VX, the power transmission control unit 120 proceeds to step S16.

  In step S <b> 16, the power transmission control unit 120 outputs a voltage signal for outputting the supply enable signal STD to the power transmission circuit unit 110. The power transmission circuit unit 110 outputs a supply enable signal STD based on the voltage signal received from the power transmission control unit 120.

The power transmission communication control and the power reception communication control have the following contents.
The power transmission communication control indicates control for acquiring information of the power receiving device 200 after the power receiving device 200 starts supplying power to the electric load unit 3. The power transmission device 100 operates as follows in power transmission communication control. The power transmission control unit 120 outputs a voltage signal to the power transmission circuit unit 110 at regular intervals. This voltage signal includes information for causing the power transmission coil 111 to output the power transmission communication signal STF. The power transmission circuit unit 110 outputs the power transmission device signal ST including the power transmission communication signal STF by the power transmission coil 111 based on the voltage signal output from the power transmission control unit 120.

  The power receiving communication control indicates control for outputting information of the power receiving device 200 after the power receiving device 200 starts supplying power to the electric load unit 3. The power receiving device 200 operates as follows in the power receiving communication control. The power receiving circuit unit 210 receives the power transmission communication signal STF output from the power transmitting circuit unit 110 when the power receiving device 200 has the normal position or the non-normal position.

  The power reception detection unit 230 detects the pre-rectification voltage VRF. The pre-rectification voltage VRF includes the power transmission device signal ST received by the power reception circuit unit 210. The power transmission device signal ST includes a power transmission communication signal STF. The power reception detection unit 230 outputs the pre-rectification voltage VRF including the power transmission communication signal STF to the power reception control unit 220.

  The power reception control unit 220 determines whether or not the load input current IL is less than the supply stop current ILX based on the power transmission communication signal STF included in the pre-rectification voltage VRF. The supply stop current ILX indicates a value for determining whether the charge level of the electric load unit 3 belongs to a low level or a high level.

  When the load input current IL is equal to or greater than the supply stop current ILX, the power reception control unit 220 outputs a voltage signal to the power reception circuit unit 210 based on the determination result. This voltage signal includes information for causing the power receiving coil 211 to output the transmission request signal SRB. The power receiving circuit unit 210 outputs the power receiving device signal SR including the transmission request signal SRB by the power receiving coil 211 based on the voltage signal output from the power receiving control unit 220. The transmission request signal SRB indicates a signal that requests the electric load unit 3 to continuously supply power.

  When the load input current IL is less than the supply stop current ILX, the power reception control unit 220 outputs a voltage signal to the power reception circuit unit 210 based on the determination result. This voltage signal includes information for causing the power receiving coil 211 to output the stop request signal SRC. The power receiving circuit unit 210 outputs the power receiving device signal SR including the stop request signal SRC by the power receiving coil 211 based on the voltage signal output from the power receiving control unit 220. The stop request signal SRC indicates a signal for requesting to stop the supply of power to the electric load unit 3.

The power transmission control has the following contents.
The power transmission control indicates control related to the power transmission mode of the power transmission circuit unit 110 for supplying power to the electric load unit 3. The power transmission device 100 operates as follows in the power transmission control. When the power transmission circuit unit 110 receives the transmission request signal SRB, the power transmission control unit 120 continues to transmit power in the production mode based on the transmission request signal SRB. When the power transmission circuit unit 110 receives the stop request signal SRC, the power transmission control unit 120 stops the power transmission in the production mode and starts the power transmission in the preparation mode based on the stop request signal SRC.

The power supply control has the following contents.
The power supply control indicates control related to the power supply mode of the power adjustment unit 240 for supplying power to the electric load unit 3. The power receiving device 200 operates as follows in the power supply control. The power reception control unit 220 outputs a voltage signal to the power adjustment unit 240 based on the load input current IL. This voltage signal includes information for controlling the power supply form from the power adjustment unit 240 to the electric load unit 3. The power adjustment unit 240 changes the supply form of power to the electric load unit 3 based on the voltage signal output from the power reception control unit 220.

  The power reception control unit 220 outputs a supply voltage signal to the power adjustment unit 240 when the load input current IL is greater than or equal to the supply stop current ILX. The supply voltage signal includes information for supplying power from the power adjustment unit 240 to the electric load unit 3. The power adjustment unit 240 supplies power to the electric load unit 3 based on the supply voltage signal output from the power reception control unit 220.

  The power reception control unit 220 outputs a stop voltage signal to the power adjustment unit 240 when the load input current IL is less than the supply stop current ILX. The stop voltage signal includes information for stopping the supply of power from the power adjustment unit 240 to the electric load unit 3. The power adjustment unit 240 stops the supply of power to the electric load unit 3 based on the stop voltage signal output from the power reception control unit 220.

  FIG. 3 shows an example of the operation of the non-contact power transmission system 1. In this example of operation, when the power receiving device 200 is installed at a normal position with respect to the power transmitting device 100, the changes indicated by the items (a) to (f) with the passage of time are expressed in the form of a time chart. Show.

The period before time t30 indicates the following state.
The power transmission device 100 is maintained in a power-on state. The power receiving device 200 is not installed in the installation unit 102. The power transmission control unit 120 performs installation determination control. The power transmission control unit 120 selects the preparation mode as the power transmission mode of the power transmission circuit unit 110 and causes the power transmission circuit unit 110 to output power in the preparation mode.

Time t30 indicates the following state.
The power transmission control unit 120 continues the installation determination control. The power receiving device 200 is installed at a normal position with respect to the installation unit 102. The power transmission voltage VT decreases to a voltage lower than when the power receiving device 200 is not installed in the installation unit 102 according to a change in impedance due to the installation of the power receiving device 200 in the installation unit 102.

  The power receiving circuit unit 210 receives power transmitted from the power transmitting circuit unit 110. For this reason, the post-rectification voltage VRR is higher than the starting voltage VD of the power reception control unit 220. For this reason, the power reception control unit 220 changes from a power-off state to a power-on state. The power reception control unit 220 does not start supplying power from the power adjustment unit 240 to the electric load unit 3 based on the fact that the power reception circuit unit 210 has not received the supply enable signal STD. Therefore, the load input voltage VL and the load input current IL indicate initial values.

The period after time t30 to immediately before time t31 indicates the following state.
The power transmission voltage VT indicates a lower voltage than when the power receiving device 200 is not installed in the installation unit 102. The rectified voltage VRR indicates a higher voltage than when power is supplied from the power adjustment unit 240 to the electric load unit 3 because power is not supplied from the power adjustment unit 240 to the electric load unit 3. The load input voltage VL and the load input current IL indicate initial values.

Time t31 indicates the following state.
The power transmission control unit 120 determines that the power receiving device 200 is installed in the installation unit 102 based on the fact that the transmission voltage VT has a magnitude equal to or lower than the installation determination voltage VS. The power transmission control unit 120 completes the installation determination control based on the fact that the power receiving device 200 is installed, and starts information confirmation control.

The period immediately before time t31 to time t32 indicates the following state.
In the information confirmation control, the power transmission control unit 120 causes the power transmission circuit unit 110 to output an information request signal STB for each predetermined period in the preparation mode. The power transmission voltage VT indicates a lower voltage than when the power receiving device 200 is not installed in the installation unit 102.

  The power receiving circuit unit 210 receives the information request signal STB output from the power transmitting circuit unit 110. The power reception control unit 220 starts information response control based on the information request signal STB. The power reception control unit 220 causes the power reception circuit unit 210 to output the power reception device signal SRA by performing load modulation control in the information response control. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

  The power transmission circuit unit 110 receives the power receiving device signal SRA output from the power reception circuit unit 210. The power transmission control unit 120 determines whether or not the power receiving device signal SRA matches the power transmission device signal STE. The power transmission control unit 120 authenticates the power reception device 200 as a device corresponding to the power transmission device 100 based on the fact that the power reception device signal SRA matches the power transmission device signal STE.

Time t32 indicates the following state.
The power transmission control unit 120 ends the information confirmation control and starts the supply permission control based on the fact that the power receiving apparatus 200 has been authenticated. The power transmission control unit 120 starts a comparison between the pre-rectification voltage signal SRF included in the power transmission voltage VT and the supply determination voltage VX in the supply permission control.

The period immediately before time t32 to time t33 indicates the following state.
The power transmission control unit 120 compares the pre-rectification voltage signal SRF included in the transmission voltage VT with the supply determination voltage VX, and the pre-rectification voltage VRF indicated by the pre-rectification voltage signal SRF has a magnitude greater than or equal to the supply determination voltage VX. Determine. The power transmission control unit 120 sets the supply enable signal STD to ON based on the fact that the pre-rectification voltage VRF has a magnitude equal to or higher than the supply determination voltage VX. The power transmission control unit 120 changes the power transmission mode of the power transmission circuit unit 110 from the preparation mode to the production mode based on the fact that the suppliable signal STD is set to ON, and starts preparation for starting the power transmission control. .

Time t33 indicates the following state.
The power transmission control unit 120 causes the power transmission circuit unit 110 to output a supply enable signal STD based on the completion of preparation for executing power transmission control. Based on the output of the supply enable signal STD, the power transmission control unit 120 completes the supply permission control and starts power transmission control and power transmission communication control.

  The power receiving circuit unit 210 receives the suppliable signal STD output from the power transmitting circuit unit 110. The power reception control unit 220 starts power supply control and power reception communication control based on the supply enable signal STD. The power reception control unit 220 starts power supply to the electric load unit 3 by the power adjustment unit 240 in the power supply control.

  The load input voltage VL becomes higher than the voltage before the supply of electric power to the electric load unit 3 is started by supplying electric power to the electric load unit 3. The load input current IL becomes higher than the current before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3. The rectified voltage VRR becomes lower than the voltage before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3.

After time t33, the following states are shown.
The power transmission control unit 120 continues power transmission by the power transmission circuit unit 110 in the power transmission control. The power transmission control unit 120 causes the power transmission circuit unit 110 to output a power transmission communication signal STF in power transmission communication control.

  The power reception circuit unit 210 receives the power transmission communication signal STF output from the power transmission circuit unit 110. The power reception control unit 220 compares the load input current IL and the supply stop current ILX based on the power transmission communication signal STF, and determines the charge level of the electric load unit 3. When the load input current IL is greater than or equal to the supply stop current ILX, the power reception control unit 220 causes the power reception circuit unit 210 to output the transmission request signal SRB by performing load modulation control in the power reception communication control. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

  As an example, the non-contact power transmission system 1 stops the power supply control by the following operation. When the load input current IL is less than the supply stop current ILX, the power reception control unit 220 causes the power reception circuit unit 210 to output a stop request signal SRC by load modulation control. The power reception control unit 220 stops the power supply control based on the fact that the load input current IL indicates a magnitude smaller than the supply stop current ILX. The load input current IL and the load input voltage VL decrease as the power supply control is stopped.

  The power transmission circuit unit 110 receives the stop request signal SRC output from the power reception circuit unit 210. The power transmission control unit 120 stops the power transmission control based on the stop request signal SRC and starts the installation determination control. The power transmission control unit 120 changes the power transmission mode of the power transmission circuit unit 110 from the production mode to the preparation mode based on the stop request signal SRC.

  The transmission voltage VT decreases to a voltage corresponding to the power in the preparation mode as the transmission mode of the power transmission circuit unit 110 is changed. The rectified voltage VRR decreases to a voltage corresponding to the power in the preparation mode as the power transmission mode of the power transmission circuit unit 110 is changed.

  FIG. 4 shows an example of the operation of the non-contact power transmission system 1. In this example of operation, when the power receiving apparatus 200 is installed at a non-regular position with respect to the power transmitting apparatus 100 and then installed at the regular position, each item of (a) to (f) These changes are shown in a time chart format.

The period before time t40 indicates the following state.
The power transmission device 100 is maintained in a power-on state. The power receiving device 200 is not installed in the installation unit 102. The power transmission control unit 120 performs installation determination control. The power transmission control unit 120 selects the preparation mode as the power transmission mode of the power transmission circuit unit 110 and causes the power transmission circuit unit 110 to output power in the preparation mode.

Time t40 indicates the following state.
The power transmission control unit 120 continues the installation determination control. The power receiving device 200 is installed at an irregular position with respect to the installation unit 102. The power transmission voltage VT decreases to a voltage lower than when the power receiving device 200 is not installed in the installation unit 102 according to a change in impedance due to the installation of the power receiving device 200 in the installation unit 102. The power transmission voltage VT is higher than the time t30 in the operation example of FIG. 3 because the power receiving device 200 is installed at the non-regular position (see FIG. 3D).

  The power receiving circuit unit 210 receives power transmitted from the power transmitting circuit unit 110. For this reason, the post-rectification voltage VRR is higher than the starting voltage VD of the power reception control unit 220. For this reason, the power reception control unit 220 changes from a power-off state to a power-on state. The power reception control unit 220 does not start supplying power from the power adjustment unit 240 to the electric load unit 3 based on the fact that the power reception circuit unit 210 has not received the supply enable signal STD. Therefore, the load input voltage VL and the load input current IL indicate initial values.

The period after time t40 to immediately before time t41 indicates the following state.
The power transmission voltage VT indicates a lower voltage than when the power receiving device 200 is not installed in the installation unit 102. The rectified voltage VRR indicates a higher voltage than when power is supplied from the power adjustment unit 240 to the electric load unit 3 because power is not supplied from the power adjustment unit 240 to the electric load unit 3. The load input voltage VL and the load input current IL indicate initial values.

Time t41 indicates the following state.
The power transmission control unit 120 determines that the power receiving device 200 is installed in the installation unit 102 based on the fact that the transmission voltage VT has a magnitude equal to or lower than the installation determination voltage VS. The power transmission control unit 120 completes the installation determination control based on the fact that the power receiving device 200 is installed, and starts information confirmation control. The rectified voltage VRR is lower than the voltage when the power receiving apparatus 200 is installed at the regular position because the power receiving apparatus 200 is installed at the non-regular position (see FIG. 3C).

The period immediately before time t41 to time t42 indicates the following state.
In the information confirmation control, the power transmission control unit 120 causes the power transmission circuit unit 110 to output an information request signal STB for each predetermined period in the preparation mode. The transmission voltage VT indicates a voltage lower than that before the information request signal STB is output with the output of the information request signal STB.

  The power receiving circuit unit 210 receives the information request signal STB output from the power transmitting circuit unit 110. The power reception control unit 220 starts information response control based on the information request signal STB. The power reception control unit 220 causes the power reception circuit unit 210 to output the power reception device signal SRA by performing load modulation control in the information response control. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

  The power transmission circuit unit 110 receives the power receiving device signal SRA output from the power reception circuit unit 210. The power transmission control unit 120 determines whether or not the power receiving device signal SRA matches the power transmission device signal STE. The power transmission control unit 120 authenticates the power reception device 200 as a device corresponding to the power transmission device 100 based on the fact that the power reception device signal SRA matches the power transmission device signal STE.

Time t42 indicates the following state.
The power transmission control unit 120 ends the information confirmation control and starts the supply permission control based on the fact that the power receiving apparatus 200 has been authenticated. The power transmission control unit 120 starts a comparison between the pre-rectification voltage signal SRF included in the power transmission voltage VT and the supply determination voltage VX in the supply permission control.

The period immediately before time t42 to time t43 indicates the following state.
The power transmission control unit 120 compares the pre-rectification voltage signal SRF included in the transmission voltage VT with the supply determination voltage VX, and the pre-rectification voltage VRF indicated by the pre-rectification voltage signal SRF has a magnitude less than the supply determination voltage VX. Determine. The power transmission control unit 120 sets the supply negative signal STC to ON based on the fact that the pre-rectification voltage VRF has a magnitude less than the supply determination voltage VX, and continues the supply permission control.

The time immediately before time t43 indicates the following state.
In the power receiving device 200, the position with respect to the power transmitting device 100 is changed from the non-regular position to the regular position. The power receiving circuit unit 210 changes the impedance with respect to the power transmitting device 100 based on the power receiving coil 211 as the power receiving device 200 takes the normal position. The rectified voltage VRR rises as the impedance of the power reception circuit unit 210 changes compared to when the power reception device 200 is installed at an irregular position. The rectified voltage VRR rises to a voltage greater than or equal to the supply determination voltage VX.

A period after time t43 to immediately before time t44 indicates the following state.
The power transmission control unit 120 compares the pre-rectification voltage signal SRF included in the transmission voltage VT with the supply determination voltage VX, and the pre-rectification voltage VRF indicated by the pre-rectification voltage signal SRF has a magnitude greater than or equal to the supply determination voltage VX. Determine. The power transmission control unit 120 sets the supply enable signal STD to ON based on the fact that the pre-rectification voltage VRF has a magnitude equal to or higher than the supply determination voltage VX. The power transmission control unit 120 changes the power transmission mode of the power transmission circuit unit 110 from the preparation mode to the production mode based on the fact that the suppliable signal STD is set to ON, and starts preparation for starting the power transmission control. .

Time t44 indicates the following state.
The power transmission control unit 120 causes the power transmission circuit unit 110 to output a supply enable signal STD based on the completion of preparation for executing power transmission control. Based on the output of the supply enable signal STD, the power transmission control unit 120 completes the supply permission control and starts power transmission control and power transmission communication control.

  The power receiving circuit unit 210 receives the suppliable signal STD output from the power transmitting circuit unit 110. The power reception control unit 220 starts power supply control and power reception communication control based on the supply enable signal STD. The power reception control unit 220 starts power supply to the electric load unit 3 by the power adjustment unit 240 in the power supply control.

  The load input voltage VL becomes higher than the voltage before the supply of electric power to the electric load unit 3 is started by supplying electric power to the electric load unit 3. The load input current IL becomes higher than the current before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3. The rectified voltage VRR becomes lower than the voltage before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3. In addition, after time 44, the same or similar state is shown after time t33 in the operation example of FIG.

  FIG. 5 shows an example of the operation of the first comparison transmission system. The first comparison transmission system is a virtual contactless power transmission system that is different from the contactless power transmission system 1 in the following points and has the same configuration as that of the contactless power transmission system 1 in other points. In addition, the description regarding the 1st comparison transmission system attaches | subjects the code | symbol same as the code | symbol of the component of the non-contact electric power transmission system 1 with respect to the component common to the non-contact electric power transmission system 1. FIG.

  The power transmission control unit 120 of the first comparison transmission system does not execute supply permission control. That is, the first comparative transmission system performs information confirmation control based on completion of installation determination control, and starts power transmission control based on completion of information confirmation control. The first comparison transmission system causes the power receiving device 200 to start power supply control based on the completion of the information confirmation control. In addition, it is thought that the non-contact electric power transmission system of Unexamined-Japanese-Patent No. 2011-19373 and Unexamined-Japanese-Patent No. 2011-205867 has the operation | movement similar to the following operation | movement which a 1st comparison transmission system has.

  FIG. 5 shows an example of the operation of the first comparison transmission system. An example of this operation is a time chart format in which each item of (a) to (f) indicates changes with time when the power receiving device 200 is installed at an irregular position with respect to the power transmitting device 100. It shows by.

  The operation example of FIG. 5 is mainly different from the operation example of FIG. 4 in the following points. Note that the period before time t50 shows the same or similar state as the period before time 40. Time t50 indicates the same or similar state as time t40. The period after time t50 to immediately before time t51 shows the same or similar state as the period after time 40 to immediately before time t41.

Time t51 indicates the following state.
The power transmission control unit 120 completes the installation determination control based on the fact that the power receiving device 200 is installed, and starts information confirmation control. The rectified voltage VRR is lower than the voltage when the power receiving apparatus 200 is installed at the regular position because the power receiving apparatus 200 is installed at the non-regular position (see FIG. 3C).

The period from time t51 to just before time t52 indicates the following state.
In the information confirmation control, the power transmission control unit 120 causes the power transmission circuit unit 110 to output an information request signal STB at regular intervals. The power receiving circuit unit 210 receives the information request signal STB output from the power transmitting circuit unit 110. The power reception control unit 220 starts information response control based on the information request signal STB. The power reception control unit 220 causes the power reception circuit unit 210 to output the power reception device signal SRA by performing load modulation control in the information response control. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

  The power transmission circuit unit 110 receives the power receiving device signal SRA output from the power reception circuit unit 210. The power transmission control unit 120 determines whether or not the power receiving device signal SRA matches the power transmission device signal STE. The power transmission control unit 120 authenticates the power reception device 200 as a device corresponding to the power transmission device 100 based on the fact that the power reception device signal SRA matches the power transmission device signal STE. The power transmission control unit 120 changes the power transmission mode of the power transmission circuit unit 110 from the preparation mode to the production mode based on the authentication of the power receiving device 200, and starts preparation for executing the power transmission control.

Time t52 indicates the following state.
The power transmission control unit 120 causes the power transmission circuit unit 110 to output a supply enable signal STD based on the completion of preparation for executing power transmission control. The power transmission control unit 120 completes the information confirmation control based on the output of the supply enable signal STD, and starts power transmission control and power transmission communication control.

  The power receiving circuit unit 210 receives the suppliable signal STD output from the power transmitting circuit unit 110. The power reception control unit 220 starts power supply control and power reception communication control based on the supply enable signal STD. The power reception control unit 220 starts power supply to the electric load unit 3 by the power adjustment unit 240 in the power supply control.

  The load input voltage VL becomes larger than the voltage before the supply of electric power to the electric load unit 3 is started by supplying electric power to the electric load unit 3. The load input current IL becomes larger than the current before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3. The rectified voltage VRR becomes lower than the voltage before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3.

  In the first comparison transmission system, the rectified voltage VRR before the start of power supply control is lower than that in the operation example of FIG. Lower. The rectified voltage VRR after the start of power supply to the electric load unit 3 has a small difference from the starting voltage VD.

A period from time t52 to immediately before time t53 indicates the following state.
The power transmission control unit 120 continues power transmission by the power transmission circuit unit 110 in the power transmission control. The power transmission control unit 120 causes the power transmission circuit unit 110 to output a power transmission communication signal STF in power transmission communication control.

  The power reception circuit unit 210 receives the power transmission communication signal STF output from the power transmission circuit unit 110. The power reception control unit 220 compares the load input current IL and the supply stop current ILX based on the power transmission communication signal STF, and determines the charge level of the electric load unit 3. When the load input current IL is greater than or equal to the supply stop current ILX, the power reception control unit 220 causes the power reception circuit unit 210 to output the transmission request signal SRB by performing load modulation control in the power reception communication control. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

  In the first comparative transmission system, since the rectified voltage VRR at the start of power supply control (time t52) is lower than the operation example of FIG. 3, the rectified voltage VRR with load modulation control is less than the startup voltage VD. descend. For this reason, the power reception control unit 220 stops its operation and stops the power supply control. For this reason, the load input voltage VL and the load input current IL are reduced to the magnitude before the power supply control is performed.

  In the information confirmation control, the power transmission control unit 120 causes the power transmission circuit unit 110 to output an information request signal STB at regular intervals. For this reason, the period from the start of power supply control at time t52 to when the power receiving circuit unit 210 receives the information request signal STB is short. For this reason, the period until the operation of the power reception control unit 220 stops after the start of the power supply control is also short. For this reason, the load input voltage VL and the load input current IL show a pulse-like change in a period from the start of the power supply control to the stop of the operation of the power reception control unit 220. For this reason, there exists a possibility of exerting an unfavorable influence on the electric load part 3. When the electrical load unit 3 includes a lithium ion battery, pulse-like changes in the load input voltage VL and the load input current IL may have a particularly undesirable effect on the electrical load unit 3.

  As described above, the first comparison transmission system has the power supply control of the power receiving device 200 under power supply control due to the power supply control being started in a state where the rectified voltage VRR has a magnitude lower than the supply determination voltage VX. The operation of the power reception control unit 220 stops with the operation.

Time t53 indicates the following state.
When the operation of the power reception control unit 220 stops, the power transmission control unit 120 starts the information confirmation control again based on the fact that the installation determination control has already been completed. The rectified voltage VRR rises to a magnitude equal to or higher than the starting voltage VD as the power supply control is stopped. For this reason, the power reception control unit 220 resumes the operation.

A period from time t53 to immediately before time t54 indicates the following state.
In the information confirmation control, the power transmission control unit 120 causes the power transmission circuit unit 110 to output an information request signal STB at regular intervals. The power receiving circuit unit 210 receives the information request signal STB output from the power transmitting circuit unit 110. The power reception control unit 220 starts information response control based on the information request signal STB. The power reception control unit 220 causes the power reception circuit unit 210 to output the power reception device signal SRA by performing load modulation control in the information response control. That is, a state similar to the period from time t51 to just before time t52 occurs.

  For this reason, the rectified voltage VRR drops to the vicinity of the start-up voltage VD at time t54, similarly to time t52. For this reason, the post-rectification voltage VRR decreases to a level less than the start-up voltage VD in accordance with the load modulation control in the period after time t54 as in the period after time t52.

  Time t55 shows the same state as time t53. The period from time t55 to just before time t56 shows the same state as the period from time t51 to just before time t52. Time t56 shows the same state as time t52. The period from time t56 to just before time t57 shows the same state as the period from time t52 to just before time t53. Time t57 shows the same state as time t53. The first comparison transmission system repeats the same state thereafter.

  Since the non-contact power transmission system 1 executes the supply permission control, it is possible to suppress the occurrence of the above problem that occurs in the first comparison transmission system. As an example, the difference in operation between the non-contact power transmission system 1 and the first comparison transmission system is due to the behavior at and around time t43 in the operation example of FIG. 4, and the behavior at and around time t52 in the operation example of FIG. It is specified.

  FIG. 6 shows an example of the operation of the second comparison transmission system. The second comparison transmission system is a virtual contactless power transmission system that is different from the contactless power transmission system 1 in the following points and has the same configuration as that of the contactless power transmission system 1 in other points. In addition, the description regarding the 2nd comparison transmission system attaches | subjects the code | symbol same as the code | symbol of the component of the non-contact electric power transmission system 1 with respect to the component common to the non-contact electric power transmission system 1. FIG.

  The power transmission control unit 120 of the second comparison transmission system does not execute the supply permission control. That is, the second comparison transmission system performs information confirmation control based on completion of installation determination control, and starts power transmission control based on completion of information confirmation control. The second comparison transmission system causes the power receiving device 200 to start power supply control based on the completion of the information confirmation control.

  The second comparative transmission system performs current adjustment control during communication after the start of power supply control. In the communication current adjustment control, the load input current IL is reduced more than when the power receiving circuit unit 210 does not receive the power transmission communication signal STF before the power reception communication control is started during the power supply control.

  The current adjustment control during communication decreases the load input current IL with the intention of suppressing the rectified voltage VRR from decreasing to a level lower than the starting voltage VD. Note that the non-contact power transmission system of Japanese Patent No. 4413236 is considered to have operations similar to the following operations of the second comparative transmission system.

  FIG. 6 shows an example of the operation of the second comparison transmission system. An example of this operation is a time chart format in which each item of (a) to (f) indicates changes with time when the power receiving device 200 is installed at an irregular position with respect to the power transmitting device 100. It shows by.

  The operation example of FIG. 6 is mainly different from the operation example of FIG. 5 in the following points. Note that the period before time t60 shows the same or similar state as the period before time 50. Time t60 indicates a state similar to or similar to time t50. A period after time t60 to immediately before time t61 shows the same or similar state as a period after time 50 to immediately before time t51. Time t51 indicates the same or similar state as time t51. The period after time t61 to immediately before time t62 shows the same or similar state as the period after time 51 to immediately before time t52.

Time t62 indicates the following state.
The power transmission control unit 120 changes the power transmission mode of the power transmission circuit unit 110 from the preparation mode to the production mode based on the fact that the power receiving device signal SRA matches the power transmission device signal STE, and power supply control, power reception communication control, and Start current adjustment control during communication. The power reception control unit 220 starts power supply to the electric load unit 3 by the power adjustment unit 240 in the power supply control.

  The load input voltage VL becomes larger than the voltage before the supply of electric power to the electric load unit 3 is started by supplying electric power to the electric load unit 3. The load input current IL becomes larger than the current before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3. The rectified voltage VRR becomes lower than the voltage before the supply of power to the electrical load unit 3 is started by supplying power to the electrical load unit 3.

  In the second comparative transmission system, the rectified voltage VRR before the start of power supply control is lower than that in the operation example of FIG. Lower. The rectified voltage VRR after the start of power supply to the electric load unit 3 has a small difference from the starting voltage VD.

A period from time t62 to immediately before time t63 indicates the following state.
The power transmission control unit 120 continues power transmission by the power transmission circuit unit 110 in the power transmission control. The power transmission control unit 120 causes the power transmission circuit unit 110 to output a power transmission communication signal STF in power transmission communication control.

Time t63 indicates the following state.
The power reception circuit unit 210 receives the power transmission communication signal STF output from the power transmission circuit unit 110. The power reception control unit 220 compares the load input current IL and the supply stop current ILX based on the power transmission communication signal STF, and determines the charge level of the electric load unit 3. The power reception control unit 220 executes current adjustment control during communication when the load input current IL is equal to or greater than the supply stop current ILX.

  In communication current adjustment control, the power reception control unit 220 reduces the load input current IL more than when the power reception circuit unit 210 does not receive the power transmission communication signal STF. The rectified voltage VRR increases as the load input current IL decreases. The power reception control unit 220 causes the power reception circuit unit 210 to output the transmission request signal SRB by performing load modulation control in power reception communication control after the rectified voltage VRR increases. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

  The second comparative transmission system executes communication current adjustment control because the rectified voltage VRR at the start of power supply control (time t62) is lower than the operation example of FIG. 3 (time t33 of FIG. 3C). When not, the difference between the rectified voltage VRR and the starting voltage VD is small. However, since the second comparative transmission system executes the current adjustment control during communication unlike the first comparative transmission system, the rectified voltage VRR is prevented from decreasing to a level lower than the startup voltage VD due to the load modulation control. The

  In the information confirmation control, the power transmission control unit 120 causes the power transmission circuit unit 110 to output an information request signal STB at regular intervals. For this reason, the period from the start of power supply control at time t62 until the power receiving circuit unit 210 receives the information request signal STB is short. For this reason, the period until the load input current IL is reduced by the current adjustment control during communication after the start of the power supply control is also short. For this reason, the load input current IL shows a pulse-like change in a period from the start of power supply control to the execution of communication current adjustment control. For this reason, there exists a possibility of exerting an unfavorable influence on the electric load part 3.

  As described above, the second comparative transmission system causes the pulse-like change in the load input current IL due to the current adjustment control during communication for suppressing the rectified voltage VRR from decreasing to a level lower than the startup voltage VD. May occur. When the electrical load unit 3 includes a lithium ion battery, pulse-like changes in the load input voltage VL and the load input current IL may have a particularly undesirable effect on the electrical load unit 3.

A period from time t63 to time t64 indicates the following state.
When the load input current IL is greater than or equal to the supply stop current ILX, the power reception control unit 220 causes the power reception circuit unit 210 to output the transmission request signal SRB by performing load modulation control in the power reception communication control. The pre-rectification voltage VRF and the post-rectification voltage VRR change according to a change in impedance by load modulation control.

Time t64 indicates the following state.
The power reception control unit 220 temporarily stops communication current adjustment control. The load input current IL increases as the current adjustment control during communication stops. The rectified voltage VRR decreases to near the start-up voltage VD as the current adjustment control during communication stops.

  Time t65 shows the same state as time t63. The period from time t65 to just before time t66 shows the same state as the period from time t63 to just before time t64. Time t66 shows the same state as time t64. The second comparison transmission system repeats the same state thereafter.

  Since the non-contact power transmission system 1 performs the supply permission control, it is possible to suppress the occurrence of the above problem that occurs in the second comparison transmission system. As an example, the difference in operation between the non-contact power transmission system 1 and the second comparison transmission system is due to the behavior at and around time t43 in the operation example of FIG. 4 and the behavior from time t62 to time t63 in the operation example of FIG. It is specified.

The non-contact power transmission system 1 has the following operations and effects.
(1) The power reception control unit 220 is driven based on the rectified voltage VRR. The post-rectification voltage VRR changes according to the pre-rectification voltage VRF. Therefore, the pre-rectification voltage VRF and the post-rectification voltage VRR can be used as information for confirming the possibility that the post-rectification voltage VRR is lower than the activation voltage VD of the power reception control unit 220. On the other hand, the electric load unit 3 is not supplied with power from the power receiving device 200 when the power supply control is stopped. For this reason, when the operation of the power reception control unit 220 is stopped in a state where the power supply control is stopped, the power supplied to the electric load unit 3 changes substantially before and after the operation of the power reception control unit 220 stops. Not shown.

  Based on this, the non-contact power transmission system 1 selects execution or stop of power supply control based on the pre-rectification voltage VRF. For this reason, when it is suggested that the operation of the power reception control unit 220 may stop due to the operation of the power reception device 200 due to the pre-rectification voltage VRF, the contactless power transmission system 1 operates the power reception control unit 220. The power supply control can be stopped before stopping. For this reason, when power reception control part 220 is performing power supply control, a possibility that operation of power reception control part 220 will stop becomes low. For this reason, it is suppressed that the electric power which shows a pulse-like change to the electric load part 3 is supplied. For this reason, the non-contact power transmission system 1 can suppress an undesirable influence on the electric load unit 3.

  (2) The power transmission control unit 120 performs supply permission control. For this reason, compared with the structure assumed that supply permission control is performed in the power reception control part 220, the power consumption in the power receiving apparatus 200 is reduced.

  (3) The power transmission control unit 120 performs supply permission control as part of power transmission authentication control. For this reason, compared with the structure assumed that supply permission control is performed after completion of power transmission authentication control, the start timing of power transmission control is advanced.

(Second Embodiment)
The non-contact power transmission system 1 of the second embodiment has a plurality of components. The plurality of components of the second embodiment have the same or similar structure and function as the plurality of components of the contactless power transmission system 1 of the first embodiment. In the description of the contactless power transmission system 1 of the second embodiment, a part or all of the description of the components of the second embodiment having the same or similar structure and function as the components of the first embodiment is omitted. The description of the contactless power transmission system 1 according to the second embodiment is based on the first embodiment with respect to at least some of the components of the second embodiment having the same or similar structure and function as the components of the first embodiment. The same reference numerals as those of the structural elements are attached.

  The non-contact power transmission system 1 of the second embodiment is different from the non-contact power transmission system 1 of the first embodiment in the following points, and is otherwise the same configuration as the non-contact power transmission system 1 of the first embodiment. Have The power transmission control unit 120 performs installation confirmation control instead of installation determination control in power transmission authentication control. The power reception control unit 220 performs installation response control in power reception authentication control.

The installation confirmation control and the installation response control have the following contents.
The installation confirmation control indicates control for determining whether or not the power receiving device 200 is installed in the installation unit 102. The authentication confirmation control includes a first stage and a second stage. The authentication confirmation control shifts to the later stage after passing through the earlier stage.

  The power transmission device 100 operates as follows in the first stage of the installation confirmation control. The power transmission control unit 120 outputs a voltage signal to the power transmission circuit unit 110. This voltage signal includes information for causing the power transmission coil 111 to output the installation confirmation signal STA in the preparation mode. The power transmission circuit unit 110 outputs the power transmission device signal ST including the installation confirmation signal STA by the power transmission coil 111 based on the voltage signal output from the power transmission control unit 120.

  Installation response control indicates control for outputting an installation response signal SRQ based on the installation confirmation signal STA. The power receiving device 200 operates as follows in the installation response control. The power receiving circuit unit 210 receives the power transmitting device signal ST output from the power transmitting circuit unit 110 when the power receiving device 200 has the normal position or the non-normal position.

  The power reception detection unit 230 detects the pre-rectification voltage VRF. The pre-rectification voltage VRF includes the power transmission device signal ST received by the power reception circuit unit 210. The power transmission device signal ST includes an installation confirmation signal STA. The power reception detection unit 230 outputs the pre-rectification voltage VRF including the installation confirmation signal STA to the power reception control unit 220.

  The power reception control unit 220 outputs a voltage signal to the power reception circuit unit 210 based on the installation confirmation signal STA included in the pre-rectification voltage VRF. This voltage signal includes information for causing the power receiving coil 211 to output the installation response signal SRQ. The power receiving circuit unit 210 outputs the power receiving device signal SR including the installation response signal SRQ by the power receiving coil 211 based on the voltage signal output from the power receiving control unit 220.

  The power transmission device 100 operates as follows in the later stage of the installation confirmation control. The power transmission circuit unit 110 receives the power reception device signal SR output from the power reception circuit unit 210 when the power reception device 200 has a normal position or an irregular position. The power transmission detection unit 130 detects the power transmission voltage VT. The power transmission voltage VT includes the power receiving device signal SR received by the power transmission circuit unit 110. Power reception device signal SR includes an installation response signal SRQ. The power transmission detection unit 130 outputs the power transmission voltage VT including the installation response signal SRQ to the power transmission control unit 120.

  The power transmission control unit 120 sets the installation completion signal STT to ON based on the installation response signal SRQ included in the transmission voltage VT, and starts supply permission control. The installation completion signal STT indicates that the power receiving device 200 is installed at the regular position or the non-regular position.

  The non-contact power transmission system 1 according to the second embodiment has effects similar to the effects (1) to (3) exhibited by the non-contact power transmission system 1 according to the first embodiment. That is, the effect that an adverse influence on the electrical load unit 3 can be reduced, and various other effects can be achieved.

(Other embodiments)
This non-contact power transmission system includes other embodiments different from the first embodiment and the second embodiment. Other embodiment has the form as a modification of 1st Embodiment shown below and 2nd Embodiment as an example. Note that the following modifications can be combined with each other within a technically consistent range.

  -The power transmission apparatus 100 of 1st Embodiment respond | corresponds to one type of power receiving apparatus 200. FIG. However, the correspondence relationship between the power transmission device 100 and the power reception device 200 is not limited to the content exemplified in the first embodiment. The power transmission device 100 according to the modification corresponds to a plurality of types of power reception devices 200. The power transmission control unit 120 of the power transmission device 100 performs the following processing in the power transmission authentication control shown in FIG. The power transmission control unit 120 selects the supply determination voltage VX suitable for the power receiving device 200 based on the power receiving device signal SRA of the power receiving device 200 between Step S14 and Step S15. In the next step S15, the power transmission control unit 120 compares the selected supply determination voltage VX with the pre-rectification voltage VRF, and sets the supply enable signal STD on based on the comparison result. For this reason, the power transmission control unit 120 can more accurately determine whether or not the operation of the power reception control unit 220 may stop due to the execution of power supply control in the power reception device 200. Note that the same modification is established in the power transmission control unit 120 of the second embodiment.

  -The power transmission control part 120 of 1st Embodiment controls the transmission form of the electric power of the power transmission circuit part 110 based on the relationship between the voltage signal SRF before rectification contained in the power transmission voltage VT, and the power transmission reference voltage VTX. However, the control method of the power transmission circuit unit 110 by the power transmission control unit 120 is not limited to the content exemplified in the first embodiment. The power transmission control unit 120 of the modified example controls the power transmission mode of the power transmission circuit unit 110 based on the relationship between the rectified voltage signal SRR included in the power transmission voltage VT and the power transmission reference voltage VTX. The power transmission control unit 120 sets the supply negative signal STC to OFF when the rectified voltage signal SRR is less than the power transmission reference voltage VTX, and supplies the supply enable signal STD when the rectified voltage signal SRR is equal to or higher than the power transmission reference voltage VTX. Set to on. Note that the same modification is established in the power transmission control unit 120 of the second embodiment.

  -The power transmission detection part 130 of 1st Embodiment detects the voltage of the terminal by the side of the resonance capacitor | condenser 112 in the power transmission coil 111 as the power transmission voltage VT. However, the voltage detection part by the power transmission detection part 130 is not restricted to the content illustrated by 1st Embodiment. The power transmission detection unit 130 of the modification detects the voltage of the terminal on the opposite side of the terminal on the resonance capacitor 112 side in the power transmission coil 111 as the power transmission voltage VT. A similar modification is also established in the power transmission detection unit 130 of the second embodiment.

  The power receiving device 200 of the first embodiment detects the pre-rectification voltage VRF and the post-rectification voltage VRR by the power reception detection unit 230. However, the configuration of the power receiving device 200 is not limited to the content exemplified in the first embodiment. The power receiving device 200 according to the modified example has the following configuration (a) or (b) as an example. A similar modification is also established in the power receiving device 200 of the second embodiment.

  (A) The power reception detection unit 230 of the modification detects the pre-rectification voltage VRF and does not detect the post-rectification voltage VRR. As an example, the power receiving device 200 can detect the rectified voltage VRR using another functional block. The power reception control unit 220 uses the pre-rectification voltage VRF in the control that can use the pre-rectification voltage VRF as an alternative to the post-rectification voltage VRR.

  (B) The power reception detection unit 230 of the modification detects the post-rectification voltage VRR and does not detect the pre-rectification voltage VRF. As an example, the power receiving device 200 can detect the pre-rectification voltage VRF using another functional block. The power reception control unit 220 uses the rectified voltage VRR in control that can use the rectified voltage VRR as an alternative to the pre-rectification voltage VRF.

  -The power reception detection part 230 of 1st Embodiment detects the voltage of the terminal by the side of the resonance capacitor | condenser 212 in the receiving coil 211 as the voltage VRF before rectification. However, the voltage detection part by the power reception detection unit 230 is not limited to the content exemplified in the first embodiment. The power reception detection unit 230 according to the modification detects the voltage at the terminal on the opposite side of the terminal on the resonance capacitor 212 side of the power reception coil 211 as the pre-rectification voltage VRF. A similar modification is also established in the power reception detection unit 230 of the second embodiment.

  -The non-contact electric power transmission system 1 of 1st Embodiment performs supply permission control in the power transmission control part 120. FIG. However, the execution form of supply permission control is not restricted to the content illustrated by 1st Embodiment. The non-contact power transmission system 1 of the modified example has the following configuration instead of the execution mode of the supply permission control of the first embodiment. The contactless power transmission system 1 of the modification performs supply permission control in the power reception control unit 220. The power reception control unit 220 compares the pre-rectification voltage VRF or the post-rectification voltage VRR with the power reception reference voltage VRX as the reference voltage. The power reception reference voltage VRX has the same magnitude as the power transmission reference voltage VTX or a magnitude different from the power transmission reference voltage VTX.

  The power reception control unit 220 causes the power reception circuit unit 210 to output the actual request signal SRZ when the pre-rectification voltage VRF or the post-rectification voltage VRR is equal to or higher than the power reception reference voltage VRX. The power reception control unit 220 does not cause the power reception circuit unit 210 to output the production request signal SRZ when the pre-rectification voltage VRF or the post-rectification voltage VRR is less than the power reception reference voltage VRX. The power transmission control unit 120 starts power transmission control based on the production request signal SRZ included in the power transmission voltage VT. The power transmission control unit 120 does not start the power transmission control when the installation determination control and the information confirmation control are completed and when the power transmission circuit unit 110 has not received the production request signal SRZ. In addition, the same deformation | transformation is materialized also in the non-contact electric power transmission system 1 of 2nd Embodiment.

  -The non-contact electric power transmission system 1 of 1st Embodiment performs supply permission control, after information confirmation control is completed. However, the execution form of information confirmation control and supply permission control is not restricted to the content illustrated by 1st Embodiment. The non-contact electric power transmission system 1 of a modification has the structure in any one of the following (a)-(d) as an example. In addition, the same deformation | transformation is materialized also in the non-contact electric power transmission system 1 of 2nd Embodiment.

  (A) The non-contact power transmission system 1 of the modified example starts information confirmation control and supply permission control simultaneously. This non-contact power transmission system 1 starts power transmission control and power transmission communication control after both information confirmation control and supply permission control are completed.

  (B) The non-contact power transmission system 1 of the modified example starts the supply permission control after the information confirmation control is started and before the information confirmation control is completed. This non-contact power transmission system 1 starts power transmission control and power transmission communication control after both information confirmation control and supply permission control are completed.

  (C) The non-contact power transmission system 1 of the modified example starts the supply permission control after the installation determination control is completed, starts the information confirmation control after the supply permission control is completed, and powers after the information confirmation control is completed. Start transmission control and power transmission communication control.

  (D) The non-contact power transmission system 1 of the modified example starts the supply permission control after the installation determination control is completed, and starts the information confirmation control after the start of the supply permission control and before the completion. The non-contact power transmission system 1 starts power transmission control and power transmission communication control after both supply permission control and information confirmation control are completed.

  -The non-contact electric power transmission system 1 of 1st Embodiment has the power transmission apparatus 100 illustrated by FIG. However, the configuration of the power transmission device 100 is not limited to the content exemplified in the first embodiment. The contactless power transmission system 1 according to the modification includes a modified power transmission device instead of the power transmission device 100. The modified power transmission device has a function according to the function of the power transmission device 100 and has a configuration different from that of the power transmission device 100. In addition, the same deformation | transformation is materialized also in the non-contact electric power transmission system 1 of 2nd Embodiment.

  -The non-contact electric power transmission system 1 of 1st Embodiment has the power receiving apparatus 200 illustrated by FIG. However, the configuration of the power receiving device 200 is not limited to the content exemplified in the first embodiment. The non-contact power transmission system 1 of the modified example has a modified power receiving device instead of the power receiving device 200. The modified power receiving apparatus has a function according to the function of the power receiving apparatus 200 and has a configuration different from that of the power receiving apparatus 200. In addition, the same deformation | transformation is materialized also in the non-contact electric power transmission system 1 of 2nd Embodiment.

(Additional note regarding means for solving the problem)
Means for solving the problems include the following [Appendix 1] and [Appendix 2]. Note that items included in [Appendix 1] and [Appendix 2] correspond to items disclosed in the embodiment.

[Appendix 1]
The non-contact power transmission system according to claim 4 has the following matters. The power transmission device changes the reference voltage based on a type of the power receiving device.

[Appendix 2]
The contactless power transmission system according to any one of claims 1 to 6 or the contactless power transmission system according to Supplementary Note 1 has the following matters. The power transmission device stops the transmission of power to the power receiving device when one of the pre-rectification voltage and the post-rectification voltage is less than the reference voltage.

DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power transmission system, 2 ... Commercial alternating current power supply, 3 ... Electric load part 100 ... Power transmission apparatus, 101 ... Housing part, 102 ... Installation part 110 ... Power transmission circuit part, 111 ... Power transmission coil, 112 ... Resonance capacitor 120 DESCRIPTION OF SYMBOLS ... Power transmission control part 130 ... Power transmission detection part 140 ... Power supply circuit part 200 ... Power receiving apparatus, 201 ... Housing parts, 202 ... Opposing part 210 ... Power receiving circuit part, 211 ... Power receiving coil, 212 ... Resonance capacitor 220 ... Power receiving control part 230 ... Power reception detection unit 240 ... Power adjustment unit VT ... Transmission voltage, VD ... Startup voltage, VS ... Installation determination voltage, VX ... Supply determination voltage, VL ... Load input voltage, VRF ... Voltage before rectification, VRR ... Voltage after rectification, VTX ... Transmission reference voltage, VRX ... Receiving reference voltage IL ... Load input current, ILX ... Supply stop current ST ... Transmission device signal, STA ... Installation confirmation signal, STB ... Information STC ... Supply denied signal, STD ... Supplyable signal, STE ... Power transmission device signal, STF ... Power transmission communication signal, STT ... Installation completion signal SR ... Power reception device signal, SRF ... Voltage signal before rectification, SRR ... After rectification Voltage signal, SRA ... Power receiving device signal, SRB ... Transmission request signal, SRC ... Stop request signal, SRQ ... Installation response signal, SRZ ... Production request signal

Claims (6)

A non-contact power transmission system,
The non-contact power transmission system includes a power transmission device and a power reception device,
The power receiving device includes a power receiving circuit unit, a power receiving control unit, and a power receiving detection unit,
The power reception detection unit detects at least one of a voltage before rectification that is a voltage of power before rectification in the power reception circuit unit and a voltage after rectification that is a voltage of power after rectification in the power reception circuit unit,
The power reception control unit is driven based on the rectified voltage and executes power supply control.
In the power supply control, the power receiving circuit unit supplies power received from the power transmission device to an electric load unit, and the power supply control is executed or stopped based on at least one of the pre-rectification voltage and the post-rectification voltage. Is selected contactless power transmission system. The contactless power transmission system according to claim 1, wherein the power supply control is selected to execute or stop the power supply control based on a result of comparison between the pre-rectification voltage or the post-rectification voltage and a reference voltage. . The power reception detection unit outputs at least one of a pre-rectification voltage signal indicating the pre-rectification voltage and a post-rectification voltage signal indicating the post-rectification voltage to the power reception control unit,
The non-contact according to claim 2, wherein in the power supply control, execution or stop of the power supply control is selected based on a comparison result between the voltage signal before rectification or the voltage signal after rectification and the reference voltage. Power transmission system. The power receiving device has a function of receiving power from one type of the power transmission device, executes information response control for transmitting a power receiving device signal to the power transmission device,
The contactless power transmission system according to any one of claims 1 to 3, wherein in the power supply control, execution or stop of the power supply control is selected in a period until the information response control is completed. The power receiving device has a function of receiving power from a plurality of types of the power transmitting devices, and executes information response control for transmitting a power receiving device signal to the power transmitting device,
The contactless power transmission system according to any one of claims 1 to 3, wherein in the power supply control, execution or stop of the power supply control is selected based on the power receiving device signal. The power receiving device has a function of receiving power from a plurality of types of the power transmitting devices, and executes information response control for transmitting a power receiving device signal to the power transmitting device,
The contactless power transmission system according to any one of claims 1 to 3, wherein in the power supply control, execution or stop of the power supply control is selected in a period until the information response control is completed.