JP2011211863A - Noncontact power supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide noncontact power supply equipment wherein the efficiency can be improved by using a feeding coil corresponding to power consumption of a load.SOLUTION: The noncontact power supply equipment has a power supply unit equipped with a feeding coil connected with a power supply and supplies power from the power supply to the load by electromagnetic coupling of the feeding coil and a power receiving coil connected with the load. The power supply unit includes a socket having an AC applying circuit and a feeding unit attaching portion, and a feeding coil unit having the feeding coil, wherein the feeding coil unit is mounted replaceably on the feeding with attaching portion.

Description

  The present invention relates to a non-contact power feeding device, and in particular, electromagnetically couples a power feeding coil connected to a power source and a power receiving coil connected to a load to supply power from the power source to the load. It is related with the non-contact electric power feeder which can be exchanged corresponding to.

  In recent years, for the purpose of reducing power supply loss, the spread of DC power supply in data centers, commercial facilities, and residences has been studied and attracted attention. In order to reduce the resistance loss of the power supply voltage, it is considered to increase the voltage, and from the aspect of safety against electric shock, it is considered that the non-contact power supply device is applied as a connector between the power supply system and the device, or an outlet. Has been.

The non-contact power feeding device is an electromagnetic coupling between the power feeding coil and the power receiving coil, and it is known that the efficiency is reduced due to iron loss due to the core and copper loss due to the coil. Efficiency can be improved by using a coil and a power receiving coil. That is, when power is supplied to a load with low power consumption, if a core having a large capacity is used, no-load loss increases and power supply efficiency deteriorates. On the other hand, when power is supplied to a load with large power consumption, if a core with small capacity is used, the necessary power may not be supplied.
For such a problem, even when the load fluctuates in a wide range, the power feeding coil is configured with a plurality of small power feeding coils so that power can be stably supplied, and according to the current value flowing through the power feeding coil. It is known to switch the number of small power feeding coils that are electromagnetically coupled to a power receiving coil (see, for example, Patent Document 1).

JP 2005-210801 A

Even when the load fluctuates in a wide range by the above known technique, it is possible to stably supply power, but further improvement in conversion efficiency, size reduction, and cost reduction are required.
The present invention solves the above-described problems, and an object thereof is to provide a non-contact power feeding device capable of improving the efficiency by using a power feeding coil corresponding to the power consumption of a load.

In order to solve the above problems, the non-contact power feeding device of the present invention has a power feeding unit including a power feeding coil connected to a power source, and the power feeding coil and a power receiving coil connected to a load are electromagnetically coupled. Power is supplied from a power source to a load, and the power supply unit includes an AC application circuit, a socket unit having a power supply unit mounting unit, and a power supply coil unit unit having a power supply coil. The power supply unit mounting portion is replaceably mounted.
Here, the non-contact power feeding device of the present invention includes a plurality of power feeding coil unit portions each having a power feeding core and a power feeding coil having a size corresponding to the power consumption of the load, and each of the plurality of power feeding coil unit portions includes the power feeding. It is desirable to have a structure that can be mounted on the unit mounting portion. Note that the feeding core is not necessarily required, and may be an air-core coil.

  According to the present invention, it is possible to perform electromagnetic coupling by using the power supply coil and the power receiving coil corresponding to the power consumption of the load by mounting the power supply coil corresponding to the power consumption of the load on the power supply unit mounting portion. As a result, the efficiency of the non-contact power feeding device can be improved. In addition, since the power supply coil unit corresponding to the power consumption of the load is replaced and used, an extra power supply coil is not used, and the non-contact power supply device can be downsized.

The outline explanatory view of the non-contact electric supply device of the present invention is shown. The block diagram of the socket part used in the 1st Embodiment of this invention is shown. The circuit diagram of the switch detection part used in the 1st Embodiment of this invention is shown. The circuit diagram of the switch order control part used in the 1st Embodiment of this invention is shown. The circuit diagram of the DC / AC conversion part used in the 1st Embodiment of this invention is shown. In the 1st Embodiment of this invention, the block diagram of the socket part at the time of mounting | wearing with the feed coil unit part which supplies electric power to load with large power consumption is shown. In the 1st Embodiment of this invention, explanatory drawing of the feed coil unit part and receiving coil part in the case of supplying electric power to load with large power consumption is shown. In the 1st Embodiment of this invention, the block diagram when the feed coil unit part which supplies electric power to load with small power consumption is mounted | worn is shown. In 1st Embodiment of this invention, explanatory drawing of the electric power feeding coil unit part in the case of supplying electric power to load with small power consumption and a receiving coil part is shown. An explanatory view of a tack stop structure used in a 1st embodiment of the present invention is shown. The block diagram of the socket part used by the 2nd Embodiment of this invention is shown. The circuit diagram of the unit part control circuit used in the 2nd Embodiment of this invention is shown. The block diagram of the socket part used by the 3rd Embodiment of this invention is shown. The block diagram of the socket part used in the 4th Embodiment of this invention is shown.

The non-contact power feeding device of the present invention replaces the power feeding coil unit corresponding to the power consumption of the load, and includes a power feeding unit including a power feeding coil connected to a power source and a power receiving power connected to the load. A power receiving unit including a coil, and the power supply unit includes a socket unit having an AC application circuit and a power supply unit mounting unit, and a power supply coil unit unit having a power supply coil, and the power supply coil unit unit is the power supply unit mounting unit. It is comprised by mounting | wearing interchangeably.
Here, the power feeding coil and the power receiving coil are defined by combining an air-core coil, an iron core (core), and a coil wound around the core.
Thus, since the power feeding coil corresponding to the magnitude of the power consumption of the load is mounted on the power feeding unit mounting section, and the power receiving section includes the power receiving coil section corresponding to the power consumption of the load, it corresponds to the power consumption of the load. Since power can be supplied by electromagnetically coupling the power feeding coil and the power receiving coil, and the influence of no-load loss can be reduced, the efficiency of the non-contact power feeding device can be improved.

  The power supply coil unit section includes a plurality of power supply coil unit sections each having a power supply core and a power supply coil having a size corresponding to the power consumption of the load, and each of the plurality of power supply coil unit sections is replaced with the power supply unit mounting section. It has a structure that can be mounted. As a result, it is possible to select a power supply coil unit having a power supply coil and a power supply core corresponding to the load and attach the power supply unit to the power supply unit mounting part, and as described above, the efficiency of the non-contact power supply device can be improved. .

  As described above, when a non-contact power supply device is used as a connector or an outlet, when a specific device is connected to a place where the non-contact power supply device is installed, However, when an unspecified device is connected, a non-contact power supply apparatus installed at a specific location must cope with an unspecified number of devices with different output voltages and supply power. In particular, devices with various power consumptions are connected in houses, commercial facilities, and the like, but the number of non-contact power supply devices to be installed is limited due to cost problems. According to the present invention, by replacing the power supply coil unit portion of the non-contact power supply device for a specific installation location, a non-contact power supply device having various power supply capabilities can be obtained. It is not necessary to install a plurality of types of non-contact power feeding devices corresponding to the above, and the number of non-contact power feeding devices can be reduced as a whole, so that the cost of housing equipment and facility equipment as a whole can be reduced.

  In addition, the device side has a power receiving unit as a connector or outlet of a non-contact power supply device, but a power supply coil (and a power supply core) having a power supply capacity more than necessary for the power consumption of the device is a power supply coil unit. When the power receiving unit is provided, the power receiving unit requires a power receiving coil corresponding to the power receiving unit. Therefore, the cost of the power receiving coil is high for the device, and the power receiving unit is large and heavy. According to the present invention, since it is possible to replace the power supply coil unit that is optimal for the device, the power receiving coil of the power receiving unit on the device side can be optimized, and the power receiving unit of the device can be reduced in size, weight, and cost. Is possible.

In the present invention, the power supply unit mounting portion includes an opening on the bottom surface (in particular, the side surface is not limited to the bottom surface and may be a side surface), and the opening includes an AC application circuit. When an output terminal is disposed and the power supply coil unit is attached to the power supply unit mounting part, the input terminal of the power supply coil unit may be connected to the output terminal.
In this way, when the power feeding unit mounting part is provided with an opening, and the output terminal of the AC application circuit is arranged in the opening, when the power feeding coil unit part is attached to the power feeding unit mounting part, the input of the power feeding coil unit part It is convenient because the terminal can be connected to the output terminal.

In the present invention, the socket portion connects the power source and the AC application circuit via a semiconductor switch and a mechanism switch, and when the power feeding coil unit portion is mounted on the power feeding unit mounting portion, the mechanism switch A switch control unit that first turns on the semiconductor switch, then turns on the semiconductor switch, and when the feeding coil unit part is taken out from the feeding unit mounting part, the semiconductor switch is turned off first, and then the mechanism switch is turned off. It is good to have.
In this way, when the power supply coil unit part is attached to the power supply unit attachment part by the switch control part, the mechanism switch is turned on first, then the semiconductor switch is turned on, and power is supplied from the power supply unit attachment part. When the coil unit part is taken out, the semiconductor switch is turned off first, and then the mechanism switch is turned off, so that even if a high voltage is applied, even if the mechanism switch causes chattering. It is possible to prevent a spark from being generated between the contacts of the mechanism switch.

In the present invention, it is preferable that the socket unit further includes a control unit that controls the operation of the AC application circuit, and the power supply coil unit unit includes an overcurrent detection unit of the power supply coil. And when an overcurrent detection part detects an overcurrent, it is good for a control part to control operation | movement of an alternating current application circuit based on an overcurrent detection output.
For example, when a large current flows through the power receiving coil due to a short circuit failure of the load when power is supplied from the power supply to the load, if a large current flows through the power feeding coil and the power feeding core is magnetically saturated, the power feeding coil is further increased. A current flows and the feeding coil generates heat. As a result, the IC, the transistor or the capacitor constituting the AC application circuit may be damaged, and there is a risk that the user may be burned. Since there is no means for determining whether the feeding coil is a large-capacity coil or a small-capacity coil in the AC application circuit, it cannot be determined whether the flowing current is an overcurrent. If the feeding coil has a small capacity, there is a possibility that magnetic saturation occurs due to overcurrent. Therefore, in the present invention, the power supply coil unit section includes a power supply coil overcurrent detection section, and the control section controls the AC application circuit based on the overcurrent detection output of the overcurrent detection section provided for each power supply coil unit section. . By setting it as such a structure, the socket part does not need to recognize the kind of feed coil, and can anticipate an initial effect with a simple structure. Further, with such a configuration, the power supply coil unit can be replaced, and a power supply device including a highly efficient and safe non-contact power supply device can be provided.

In the present invention, the socket unit includes a control unit that controls the operation of the AC application circuit, and a feeding power detection unit that detects power fed to the feeding coil. Power supply maximum rating value notification means for notifying the AC power application circuit of the power maximum rating value, and the control unit is notified of the power detected by the power supply power detection means by the power supply power maximum rating value notification means It is desirable to control the operation of the AC application circuit so as not to exceed the maximum rated value of the supplied power.
Specifically, the input power to the feeding coil can be reduced by reducing the voltage application time to the feeding coil. Thereby, the overcurrent prevention mentioned above can be performed and the electric power supply apparatus provided with the highly efficient and safe non-contact electric power feeder can be provided.
As a means for notifying the maximum rated current value to the socket side, for example, a switch corresponding to a specific maximum rated current value is provided by a mechanism such as a button provided on the socket side and the uneven structure of the feeding coil unit part. It can be judged as it is pushed. Moreover, even if it is not a button, it is sufficient that the socket side has a structure that can be electrically short-circuited at a specific maximum rated current value. The notification means may be short-circuited. It can be controlled by a logic circuit on the socket side thereafter. The input current detection means may be sensed by a voltage across the resistor or may be sensed by a Hall element. As described above, the power supply coil unit portion may not include the overcurrent detection unit, and the socket unit may include the current detection unit.

In the present invention, the power feeding coil unit section may further include a heating detection section, and when the overheat detection section detects overheating, the control section may control the operation of the AC application circuit based on the overheat detection output.
It is preferable that the overheat detection unit is provided in the immediate vicinity of the power supply coil and in the vicinity of the attachment / detachment position of the power supply coil unit unit touched by the user. It is possible to protect the internal circuit components by providing a heat detection circuit in the socket, but if the power supply coil unit is not actually touched by the user, the temperature is measured accurately and AC is applied. It is impossible to control the operation of the circuit. As a result, when a large current flows through the power supply coil to generate heat, or when a foreign object such as metal is sandwiched between the power supply coil unit part and the power reception coil part and heated, the temperature rise is detected, and the AC application circuit Can be controlled. Thereby, it is possible to prevent the non-contact power feeding apparatus from firing and the user from being burned. By providing each heating coil unit with a heating detection unit in this way, it is possible to provide a power supply device including a highly efficient and safe non-contact power feeding device even when the feeding coil unit is replaced. it can.

In the present invention, the power feeding coil unit section may further include an attachment / detachment detection section for the receiving coil section, and the control section may control the operation of the AC application circuit based on the detection output of the attachment / detachment detection section for the receiving coil section.
Thereby, since it can control so that an alternating current application circuit will operate | move only when the receiving coil part is mounted | worn, the power consumption of a non-contact electric power feeder can be reduced. In this way, each power supply coil unit section includes a power receiving coil section attachment / detachment detection section, so that even when the power supply coil unit section is replaced, a power supply apparatus including a highly efficient and safe non-contact power supply apparatus is provided. Can be provided.

Further, in the present invention, the AC application circuit may change the duty of the voltage applied to the power supply coil by a signal from the power supply coil unit portion mounted corresponding to the power consumption of the load. The feeding coil unit section preferably has means for notifying the AC application circuit of information on the rated power of the feeding coil provided in each. The alternating current application circuit includes a circuit for detecting a supply voltage and a supply current, and monitors the supply power. It is preferable to judge from no load to light load and steady load from information on the monitored power supply and rated power of the power supply coil, and to reduce the duty at light load. The power supply power on the load side can be predicted by the coils and cores provided in each power supply coil unit. For example, in the case of a power supply coil unit with a 500 W rated output, since the corresponding load is connected due to the coincidence of the shape of the coil and core on the power receiving side, it can be regarded as a light load up to 10 W output power. In this case, it is preferable to reduce the duty with respect to the steady output and gradually increase the duty until it reaches 10 W, and thereafter set the steady fixed duty. As a result, the voltage does not rise too much at light loads, and the fluctuation range of the output voltage can be suppressed without feeding back the output voltage on the power receiving side to the power feeding side. As a result, the feedback circuit and mechanism can be eliminated, and the cost can be reduced. During a steady load, the output voltage can be stably fed to a desired voltage with the turn ratio of the coil on the power feeding side and the coil on the power receiving side with the duty fixed. Furthermore, since the duty is reduced, the current flowing through the coil can be reduced, and the efficiency can be increased at light loads.
Thus, since the duty of the pulse signal of the pulse signal generator of the AC application circuit unit is changed according to the power supply coil unit unit corresponding to the power consumption of the load, the voltage fluctuation is small corresponding to the power consumption of the load. A stable voltage can be supplied.

  Moreover, this invention is a non-contact electric power feeding system from another viewpoint, The said electric power feeding part is from the alternating current application circuit, the electric power feeding unit mounting part, the socket part which has a control part, the electric power feeding coil, and the said electric power receiving part. An output voltage information receiving unit that receives information on the output voltage of the power supply coil unit, and a power supply coil unit unit that includes information on the output voltage received by the output voltage information receiving unit, and a power supply side output voltage information transmission unit that transmits the information to the control unit. Preferably, the power receiving unit includes an output voltage detecting unit and a power receiving side output voltage information transmitting unit that transmits information on the output voltage detected by the output voltage detecting unit to the output voltage information receiving unit. Preferably, the control unit receives information on the output voltage transmitted by the power supply side output voltage transmission unit, and controls the operation of the AC application circuit based on the information on the output voltage.

  As described above, it is preferable that the output voltage of the power receiving unit is wired so that a signal can be sent to the control unit on the socket side through a power supply coil unit by wired connection. As a result, it is possible to detect a voltage increase abnormality of the output voltage on the power receiving side, and based on the voltage increase abnormality, the control unit communicates an OFF signal to the AC voltage application circuit during the voltage application period (during the ON period). Thus, the duty can be adjusted. Further, even if it is not wired, by providing a photocoupler or a separate transformer and their drive circuit from the power receiving side, it is possible to communicate the voltage rise abnormality of the output voltage on the power receiving side to the power feeding coil unit in a non-contact manner. For example, the AC voltage application circuit is driven at the maximum fixed duty, and the set value of the output voltage is less than the voltage obtained by the winding ratio of the coil on the power supply side and the power reception side at the maximum fixed duty. preferable. Thus, the AC application circuit is driven at the maximum fixed duty, and when the output voltage exceeds the set value, the on period is preferably turned off, and the off signal is preferably reset at the next on time. If it is reset, the next on-period starts. Therefore, based on the output voltage on the power receiving side, the duty can be adjusted to obtain a stable output voltage on the power receiving side.

  In the present invention, the power feeding coil unit section may include a power receiving coil fixing portion having a size or a shape that is different from the power consumption of the load at a portion where the power feeding coil is electromagnetically coupled to the power receiving coil. Thereby, the combination of the power feeding coil unit and the power receiving coil becomes clear, and the power feeding coil and the power receiving coil can be electromagnetically coupled by the optimum combination.

In the present invention, it is preferable that the power receiving coil fixing portion includes a tacking mechanism that tacks the coupling of the power receiving coil unit.
As described above, since the power feeding coil unit portion is provided with the tacking mechanism for attaching and detaching the power receiving coil portion, it is possible to maintain a good engagement state between the power feeding coil unit portion and the power receiving coil portion. Since the coupling of magnetic fluxes is good and the leakage magnetic flux can be reduced, a non-contact power feeding device can be provided with high efficiency.

  In the present invention, the power supply coil unit section may be filled with a filler. For example, heat dissipation and insulation can be improved by filling the power supply coil unit with a silicon resin having good thermal conductivity and insulation. Furthermore, the position of the power feeding coil can be fixed at a position close to the power receiving unit when connected, and physical impacts such as dropping can be mitigated, thereby making it difficult to cause layout problems such as separation and displacement. be able to.

(Summary of Invention)
FIG. 1 is a schematic explanatory diagram of a non-contact power feeding device according to the present invention. A terminal 11 is a power generation type DC power source such as a solar power generation device or a fuel cell, or the voltage of those DC power sources by a DC power converter. It is connected to a stabilized DC power supply stabilized to a predetermined voltage, or an AC power conversion DC power supply that rectifies a commercial system (AC) and converts it to DC. In addition, the terminal 11 is connected to a socket unit 10 including an AC application circuit 12 and a power supply unit mounting unit 13. The commercial power supply may be connected to the terminal 11 as it is. In that case, the AC applying circuit 12 may apply AC to the feeding coil as it is, or may convert AC to DC once and apply high-frequency AC to the feeding coil.
A power feeding coil unit section 20 is mounted on the power feeding unit mounting section 13. The socket part 13 and the feeding coil unit part 20 constitute a feeding part. On the other hand, power is supplied to the load 40 via the power receiving coil unit 30 that is electromagnetically coupled to the power feeding coil unit unit 20. A power receiving unit is configured by including the power receiving coil unit 30.

Here, the power receiving coil unit 30 corresponds to the magnitude of power consumption of the load, and a plurality of types of power feeding coil unit units 20 are prepared so as to be compatible with the power receiving coil unit 30 corresponding to power consumption of various loads. Is done. In FIG. 1, three power supply coil unit portions 20 and a power receiving coil portion 30 are prepared and are distinguished by adding alphabetic characters. FIG. 1 shows three feeding coil unit sections 20 and receiving coil sections 30, but there is no limitation on the number (type), and any number (type) is required, but at least two or more are necessary. The loads 40a, 40b, and 40c are different in power consumption, and in FIG. 1, the square size represents the power consumption.
The three power supply coil unit units 20a, 20b, and 20c and the power reception coil units 30a, 30b, and 30c correspond to the power consumption of the loads 40a, 40b, and 40c, and the sizes of the power supply core 21 and the power reception core 31. Is different. The number of turns of the feeding coil 22 may be different or the same. The voltage fed to the load 40 is preferably adjusted by the duty ratio (ON / OFF ratio) of the AC voltage application and the ratio of the winding of the feeding coil 22 and the winding of the power receiving coil 32. However, the three power supply coil unit portions 20a, 20b, and 20c are formed to have the same structure so that they can be attached to the power supply unit attachment portion 13. That is, the shape and size are the same. The power receiving coil sections 30a, 30b, and 30c may have the power receiving core 31 and the power receiving coil 32 that are electromagnetically coupled to the power feeding core 21 and the power feeding coil 22, and the outer shapes may be the same or different.

As shown in FIG. 1, the power supply coil unit 20a supplies power to a load 40a having the largest power consumption, including, for example, electric heaters having a power consumption of about 1000 W, dryers, oven toasters, and vacuum cleaners. The feeding core 21a is formed large, and the feeding coil 22a is formed by a coil having a large number of turns.
The power supply coil unit 20b supplies power to a load 40b having a medium power consumption, such as a television having a power consumption of about 200 W or less, so that the power supply core 21b is formed to have a medium size. The coil 22b is formed by a coil having a medium number of turns.
The power supply coil unit 20c supplies power to a load 40c with low power consumption, such as a personal computer or a mobile phone charger having a power consumption of about 20 W or less, so that the power supply core 21c is formed small, and the power supply coil 22c It is formed by a coil with a small number of turns.
FIG. 1 shows a DC load, and most home appliances are DC loads. In many cases, the power receiving coil unit 30 includes a rectifier circuit 33. However, when the load 40 is an AC load, rectification is performed. No circuit is required. The AC power system may be applied to the power supply coil as it is, and after receiving power with the power receiving coil, the power may be used without changing AC.

Therefore, when supplying power to the load 40a having the largest power consumption, the feeding coil unit portion 20a having the largest feeding core 21a and the feeding coil 22a designed for high power feeding is selected, and the feeding unit mounting portion 13 is selected. Installed. In addition, when power is supplied to the load 40b with medium power consumption, the power supply coil unit section 20b having the power supply core 21b having a medium size and the power supply coil 22b designed for medium power supply is selected and supplied with power. Mounted on the unit mounting portion 13. Further, when supplying power to the load 40c with low power consumption, the power supply coil unit section 20c having the small power supply core 21c and the power supply coil 22c designed for low power supply is selected and mounted on the power supply unit mounting section 13. The
1 has the power supply core 21, it may be an air-core coil without the power supply core. Moreover, although the receiving coil part 30 has the receiving core 31, the air core coil without a receiving core may be sufficient. Further, the feeding core 21 and the receiving core 31 may use various shapes such as a C shape, an E shape, and a P shape other than the U shape as shown in FIG.

(First embodiment)
FIG. 2 shows a configuration diagram of the socket unit 10 used in the first embodiment of the present invention. For example, the socket unit 10 is inserted into a recess 101 formed in a part of a wall 100 of a house and fixed. The socket part 10 is fixed to the wall 100 with screws (not shown) so that the socket part 10 does not come out of the recess 101.
A DC power supply connector 102 is provided at the bottom of the recess 101, and its terminal is connected to the terminal 11 of the socket 10 by screwing or soldering. Although not shown in the figure, the DC power supply connector 102 is supplied with a DC power source such as a solar battery, a storage battery, or a fuel cell, or a grid AC power, adjusted to a stable predetermined DC voltage by a power converter.

The socket unit 10 includes a DC / AC conversion unit 12 and a power supply unit mounting unit 13 as an AC application circuit. The opening 13a of the power supply mounting portion 13 opens toward the wall 100, and allows the power supply coil unit portion 20 to be mounted and removed from the opening 13a.
The power supply unit mounting portion 13 is provided with an insertion port 13c for inserting a terminal of the power supply coil unit portion 20 in the back bottom surface 13b. There are two insertion openings 13c, and as shown in FIG. 6, two plug blade-type first terminals 23a of the feeding coil unit section 20 can be inserted. The power supply unit mounting portion 13 has a shock absorbing material 13d such as sponge bonded and fixed to the back bottom surface 13b with an adhesive, and absorbs an impact when the power supply coil unit portion 20 is mounted. It is more preferable to use a material having good thermal conductivity for the buffer material 13d. An example is silicon rubber. Thereby, heat can be transmitted to the power supply mounting portion 13 to increase the heat dissipation area.
In the present invention, the power supply unit mounting portion 13 and the insertion port 13 c are commonly used for the plurality of power supply coil unit portions 20. Therefore, the outer shape of the feeding coil unit 20 and the terminal position and shape of the feeding coil unit 20 are formed the same.

  The DC power supply connector 102 is connected to the DC / AC converter 12 via a semiconductor switch element 14 such as an N-channel IGBT element or an N-channel FET element, and a mechanism switch 15 including, for example, a solenoid type DC relay. Connected. The output terminal 12 a of the DC / AC conversion unit 12 is disposed so as to face the insertion port 13 c formed in the back bottom surface 13 b of the power supply unit mounting unit 13, and the first terminal 23 a of the power supply coil of the power supply coil unit unit 20 Connected. Although the output terminal 12a in FIG. 2 is indicated by a circle, it is actually constituted by a blade receiving connector that contacts the first terminal 23a of the power feeding coil unit 20 so as to sandwich it. The semiconductor switch element 14 and the mechanism switch 15 are controlled to be turned on / off by the switch control unit 18.

  The semiconductor switch opening / closing part 16 and the mechanism switch opening / closing part 17 are arranged on the surface 19 of the socket part 10 and are operated by the user. Accordingly, when the semiconductor switch opening / closing unit 16 and the mechanism switch opening / closing unit 17 are operated, the switch control unit 18 operates and the gate source of the N-channel IGBT element or N-channel FET element constituting the semiconductor switch element 14 is operated. On / off control is performed by applying 15 V as a control voltage between them. The switch control unit 18 outputs, for example, 15V to turn on the mechanism switch 15, and outputs 0V to turn it off. When a solenoid type DC relay is used as the mechanism switch 15, it is desirable to connect a reverse voltage prevention diode of the coil between the signal terminal (cathode) and the common terminal (anode) of the mechanism switch 15.

The switch control unit 18 determines the operation order of the semiconductor switch opening / closing unit 16 and the mechanism switch opening / closing unit 17. When the power supply coil unit unit 20 is mounted, the semiconductor switch opening / closing unit 16 and the mechanism switch opening / closing unit 17. Whichever is operated first, the mechanism switch 15 is turned on first, and then the semiconductor switch element 14 is turned on. Thereby, even if the DC / AC converter 12 is in operation, the mechanism switch 15 is turned on first, and even if the mechanism switch 15 causes chattering, no spark is generated, and therefore the contact is not oxidized.
Further, when the feeding coil unit section 20 is taken out, the semiconductor switch element 14 is turned off first, and the mechanism switch 15 is turned off next, regardless of which of the semiconductor switch opening / closing section 16 and the mechanism switch opening / closing section 17 is operated first. Control to be. Thereby, even if the DC / AC converter 12 is in operation, the semiconductor switch element 14 is turned off first, and the mechanism switch 15 does not generate arc discharge.

The switch control unit 18 includes a switch detection unit 18a shown in FIG. 3 and a switch order control unit 18b shown in FIG.
As shown in FIG. 3, the switch detection unit 18 a is connected to the auxiliary power supply circuit 18 a 1 that supplies the switch operating voltage from the DC power source obtained from the terminal 11, the semiconductor switch opening / closing unit 16, and the mechanism switch opening / closing unit 17. 18 a 2 and 18 a 3, 100 kΩ ground potential connection resistors 18 a 4 and 18 a 5, a semiconductor switch signal terminal 18 a 6, and a mechanism switch signal terminal 18 a 7.
The auxiliary power supply circuit 18a1 is a DC / DC conversion converter that converts a DC power supply voltage obtained at the terminal 11, for example, 380V into two output voltages of 15V and 5V. The 15V DC voltage is used to drive a relay or a semiconductor element. 5V DC voltage is used for operating the logic circuit. The 5V DC voltage is supplied from the terminal 18a2 to the semiconductor switch opening / closing unit 16, and when the semiconductor switch opening / closing unit 16 is turned on, the 5V DC voltage is output to the semiconductor switch signal terminal 18a6. However, when the semiconductor switch opening / closing part 16 is off, 0 V is output to the semiconductor switch signal terminal 18a6.
The 5V DC voltage of the auxiliary power circuit 18a1 is supplied to the mechanism switch opening / closing unit 17 from the terminal 18a3, and when the mechanism switch opening / closing unit 17 is turned on, the 5V DC voltage is output to the mechanism switch signal terminal 18a7. However, when the mechanism switch opening / closing part 17 is off, 0 V is output to the mechanism switch signal terminal 18a7.

As shown in FIG. 4, the switch order control unit 18b includes a semiconductor switch signal terminal 18a6 on the input side and a terminal 18b8 for supplying a control signal to the drive circuit of the semiconductor switch element 14 on the output side. The switch sequence control unit 18b includes AND circuits 18b1, 18b2, and 18b3, an inverter 18b4, a delay circuit 18b5 having a delay time of 0.1 milliseconds, a differentiation circuit 18b6 having a time constant of 10 milliseconds, and an SR flip-flop. Circuit 18b7. Although the drive circuit is not shown, when 5V is input from the terminal 18b8, the photocoupler is turned on, and a DC voltage of 15V is applied between the gate and source of the N-channel IGBT element or N-channel FET element. By this, it will be in an ON state.
Further, a mechanism switch signal terminal 18a7 is connected to the input side, and a terminal 18b18 for giving a control signal to the drive circuit of the mechanism switch 15 is provided on the output side, and an AND circuit 18b11 is provided between the mechanism switch signal terminal 18a7 and the terminal 18b18. , 18b12, 18b13, an inverter 18b14, a delay circuit 18b15 having a delay time of 0.1 milliseconds, a differentiating circuit 18b16 having a time constant of 10 milliseconds, and an SR flip-flop circuit 18b17. Although the drive circuit is not shown, when 5V is input from the terminal 18b18, the transistor is turned on, and the DC voltage of 15V is applied to the relay drive unit to be turned on.
The output signal of the terminal 18b18 is given to the AND circuit 18b1 and the delay circuit 18b5. On the other hand, the Q bar output of the SR flip-flop circuit 18b7 is supplied to the AND circuits 18b11 and 18b13 and the delay circuit 18b15.
Since the switch sequence control unit 18b is configured as described above, when the feeding coil unit unit 20 is mounted, the mechanism switch 15 is turned on first, and then the semiconductor switch element 14 is turned on. Is done. Further, when the feeding coil unit 20 is taken out, the semiconductor switch element 14 is turned off first, and the mechanism switch 15 is turned off next. In the present embodiment, both the semiconductor switch element 14 and the mechanism switch element 15 are provided for further safety, but only one of the switch elements may be provided.

  The DC / AC converter 12 of the present invention is configured as shown in the circuit diagram of FIG. The DC / AC converter 12 includes a half-bridge converter 121 including transistors QA and QB, diodes DA and DB, capacitors CA and CB, and a pulse signal generator that generates a pulse signal for turning the transistors QA and QB on and off. 122. The pulse signal generator 122 generates a high-frequency pulse signal and operates the half-bridge converter 121 to convert direct current into alternating current. In this case, the frequency of the high-frequency pulse signal is preferably higher than the human audible range. However, since the hysteresis loss and eddy current loss of the iron core increase when the frequency is increased to several hundred kHz or higher, it is preferably several hundred kHz or lower. For example, from the viewpoint of the human audible region or larger, the semiconductor element at 20 kHz or higher from the viewpoint of coil size. From the viewpoint of the switching speed and the frequency of generated noise, it is more preferable that the frequency is 100 kHz or less.

The pulse signal generator 122 may output a pulse signal having a fixed frequency, for example, 50 kHz, and a fixed duty, for example, a QA on period of 50% and a QB on period of 50% alternately. However, it is preferable to provide a 2-3% simultaneous off period (dead time) so that the periods when QA and QB are turned on do not overlap. When the switching of the semiconductors QA and QB is controlled by such a pulse signal, the output voltage on the power receiving coil side is a ratio of the number of turns of the power feeding coil and the number of turns of the power receiving coil to the DC voltage applied to the power feeding coil. It becomes.
Further, when receiving the voltage control signal S from the outside, the pulse signal generator 122 may control the output voltage of the DC / AC converter 12 by changing the ON period of the high-frequency pulse signal, that is, the duty. Therefore, according to the present invention, the feeding coil unit 20 is mounted on the feeding unit mounting unit 13 in accordance with the power consumption of the load. Therefore, the voltage control signal S corresponding to the feeding coil unit 20 is received and the DC / AC The output voltage of the converter 12 is controlled.

  5 shows a case where a DC power source is connected to the terminal 11 via a DC power source connector 102. For example, when AC is input from a commercial AC power source, An AC / DC conversion unit that converts AC to DC may be provided, and the AC signal may be input to the input terminal 11 after being converted to DC.

  The socket unit 10 according to the first embodiment of the present invention is configured as described above. When power is supplied to the load 40a having the largest power consumption, as shown in FIG. 6, the largest feeding core 21a and feeding coil 22a are provided. Is selected and attached to the power supply unit mounting portion 13 from the front side of the power supply coil unit portion 20a. The impact at the time of mounting is buffered by the buffer material 13d. At the time of this mounting, the two first terminals 23a provided in the feeding coil unit portion 20a are inserted into the insertion port 13c and are connected to the output terminal 12a of the DC / AC conversion unit 12 disposed in the vicinity of the insertion port 13c. Connected. Then, the unit fixing portion 9 is operated to fix the feeding coil unit portion 20a and prevent it from coming off. The power supply coil unit preferably has a mechanism that cannot be removed except when both or one of the semiconductor switch and / or the mechanism switch is OFF. Although not shown, for example, the switch and the motor are interlocked, and when the switch is turned off, the unit fixing part 9 is detached, and when the switch is on, the unit fixing part is closed and can be removed or inserted. It is preferable not to do so.

  7 shows a view of FIG. 6 as viewed from the wall 100 side. The feeding coil unit portion 20a is inserted and attached to the feeding unit mounting portion 13 of the socket portion 10, and the input terminal 23a of the feeding coil unit portion 20a is inserted. The state where it is inserted in the port 13c and connected to the output terminal 12a of the DC / AC converter 12 is shown. Next, the unit fixing part 9 is rotated to fix the feeding coil unit part 20a. Thereafter, the semiconductor switch opening / closing part 16 and the mechanism switch opening / closing part 17 provided on the surface 19 of the socket part 10 are pressed. Regardless of the operation order, the semiconductor switch opening / closing unit 16 and the mechanism switch opening / closing unit 17 are controlled so that the switch control unit 18 first turns on the mechanism switch 15 and then turns on the semiconductor switch element 14. Thereby, even if the DC / AC converter 12 is in operation, the mechanism switch 15 is turned on first, and even if the mechanism switch 15 causes chattering, no spark is generated, and therefore the contact is not oxidized. After the switch control unit 18 performs the above-described operation, the switch control unit 18 supplies power to the detachable display LED 8 to light it, and displays the completion of mounting. As shown in the figure, it is more preferable that a take-out knob 27a is attached so that the inserted feeding coil unit portion can be easily taken out. When a plurality of knobs 27a are provided, it becomes easier to grip.

A portion where the feeding coil unit 20a is coupled to the receiving coil 30a has a large recessed portion 24a as a receiving coil fixing portion, that is, on the rear side of the feeding coil unit 20a. Although the shape of the concave portion 24a in FIG. 7 is a quadrangle, the shape and size are arbitrary, and any shape corresponding to the convex portion 33a of the power receiving coil portion 30a may be used.
The power receiving coil unit 30a includes the largest power receiving core 31a and the power receiving coil 32a corresponding to the power consumption of the load, and has a convex portion 33a at a portion where the power receiving coil unit 30a is magnetically coupled to the power feeding coil unit.
Therefore, the feeding coil and the receiving coil can be coupled by fitting the projection 33a to the recess 24a. Thus, since the recessed part 24a and the convex part 33a have a mutually corresponding shape, they can be fitted together without making a mistake in the relationship between the feeding coil unit part and the receiving coil part corresponding to the power consumption of the load.

  Further, when power is supplied to the load 40c with low power consumption, the power supply coil unit portion 20c having the small power supply core 21c and the power supply coil 22c is selected as shown in FIG. 8, and power is supplied from the front side of the power supply coil unit portion 20c. Mounted on the unit mounting portion 13. The impact at the time of mounting is buffered by the buffer material 13d. At the time of this mounting, the two first terminals 23c provided in the feeding coil unit portion 20c are inserted into the insertion port 13c, and are connected to the output terminal 12a of the DC / AC conversion unit 12 disposed in the vicinity of the insertion port 13c. Connected. Then, the unit fixing portion 9 is operated to fix the feeding coil unit portion 20c and prevent it from coming off. The buffer material preferably has thermal conductivity, and heat can be released to the entire socket portion through the buffer material. Silicon rubber can be used as such a cushioning material.

  FIG. 9 shows a view of FIG. 8 as viewed from the wall 100 side. The difference from FIG. 7 is the power receiving coil portion 30c, the concave portion 24c and the convex portion 33c. is there.

Similarly, although not shown, when supplying power to the load 40b having medium power consumption, the power supply coil unit portion 20b having the medium-size power supply core 21b and the power supply coil 22b is selected and the power supply unit mounting portion is selected. 13, the fixing portion 9 is operated to fix the feeding coil unit portion 20 b and prevent it from coming off. At the time of mounting, the input terminal 23b provided in the power feeding coil unit portion 20b is inserted into the insertion port 13c and connected to the output terminal 12a of the DC / AC conversion unit 12 disposed in the vicinity of the insertion port 13c. The power supply coil unit portion 20b has a medium concave portion at the portion where the power supply coil unit portion 30b is coupled to the power receiving coil portion 30b.
Therefore, the power feeding coil and the power receiving coil can be satisfactorily magnetically coupled by fitting the middle convex portion to the middle concave portion.

  In order to remove the power supply coil unit 20 from the power supply unit mounting part 13, first, the semiconductor switch opening / closing part 16 is pressed and then the mechanism switch opening / closing part 17 is pressed. When the pressing operation is performed in this order, the mechanism switch opening / closing unit 17 first turns off the semiconductor switch element 14 and then turns off the mechanism switch 15. However, since the switch control unit 18 has a function of turning off the semiconductor switch element 14 first and then turning off the mechanism switch 15 when removing, the semiconductor switch opening / closing unit 16 and the mechanism switch opening / closing unit 17. Regardless of which one is operated first, the semiconductor switch element 14 is turned off first, and then the mechanism switch 15 is turned off. Thereby, even if the DC / AC converter 12 is in operation, the semiconductor switch element 14 is turned off first, so that no spark is generated even if the mechanism switch 15 causes arc discharge.

FIG. 10 shows a tacking mechanism 40a that tacks after the convex part 33a of the power receiving coil part 30a is coupled to the concave part 24a of the power feeding coil unit part 20a. The barb mechanism 40a includes a recess 25a into which a barb tip fits into a recess 24a provided on the rear side of the power feeding coil unit 20a. On the other hand, the power receiving coil portion 30a includes a protrusion 41a that fits into the recess 25a, a push button 42a provided at a rear portion of the power receiving coil portion 30a, a connecting rod 43a that connects the protrusion 41a and the push button 42a, and a protrusion. 41a and the push button 42a consist of a spring or a spring 44a that urges the receiving coil portion 30a to the outside.
As shown in FIG. 10, when the barb mechanism 40a is provided on the upper side and the lower side behind the power receiving coil unit 30a, both the bar mounting mechanisms 40a can be operated simultaneously, and the power receiving coil unit 30a can be attached and detached. Operation can be performed easily.
FIG. 10 shows the power feeding coil unit 20a and the power receiving coil 30a tacking mechanism 40a for supplying power to the load having the largest power consumption. However, the power is supplied to the load having medium power consumption and the load having low power consumption. Although the hooking mechanism of the power feeding coil unit portions 20b and 20c and the power receiving coils 30b and 30c is similarly configured, the illustration thereof is omitted.

In addition, a detachment detection switch button 26a that contacts the power receiving coil unit 30a and detects the mounting of the power receiving coil unit 30a when the power receiving coil unit 30a is mounted in the recess 24a of the power feeding coil unit unit 20a is provided. In order to ensure the operation of the attachment / detachment detection switch button 26a, a projection 45a may be provided on the power receiving coil portion 30a. When the attachment / detachment detection switch button 26a detects the attachment of the power receiving coil unit 30a, a drive signal is generated to the pulse signal generator 122. When this drive signal S is received by the pulse signal generator 122, generation of a pulse is started.
Thus, since the attachment / detachment state of the power receiving coil unit 30a can be detected by the attachment / detachment detection switch button 26a, the pulse signal generator is stopped and the AC application circuit is stopped when the power receiving coil unit 30a is not attached. Therefore, unnecessary power consumption can be deleted.

FIG. 10A shows a state before the power receiving coil unit 30a is attached to the power feeding coil unit 20a, and the protrusion 41a and the push button 42a protrude from the power receiving coil unit 30a by a spring or a spring 44a.
Next, as shown in FIG. 10B, when the push button 42a is pressed to attach the power receiving coil unit 30a to the power feeding coil unit 20a, the protrusion 41a is recessed into the power receiving coil unit, and the power receiving coil unit 20a receives power. The coil part 30a can be attached.
Then, as shown in FIG. 10C, when the power receiving coil portion 30a is completely attached to the power feeding coil unit portion 20a, the protrusion 41a fits into the concave portion 25a, and the power receiving coil portion 30a does not fall off. At this time, the attachment / detachment detection switch button 26 a detects the attachment of the power receiving coil unit 30 a and controls the start of operation of the DC / AC conversion unit 12.

  When the power receiving coil part 30a is extracted from the power feeding coil unit part 20a, when the push button 42a is pressed, the protrusion 41a is detached from the concave part 25a, so that the power receiving coil part 30a can be pulled out. At this time, the attachment / detachment detection switch button 26a detects that the power receiving coil unit 30a has been taken out, and stops the operation of the DC / AC converter 12 and the pulse signal generator 122.

(Second Embodiment)
FIG. 11 shows a configuration diagram of the socket unit 10 used in the second embodiment. FIG. 11 shows a case where the power feeding coil unit portion 20c with the smallest load power consumption is mounted on the power feeding unit mounting portion 13 as a representative, but the other power feeding coil unit portions 20a and 20b are similarly configured.
As shown in FIG. 11, the feeding coil unit 20c is installed in the vicinity of the feeding core 21c or the feeding coil 22c, and includes an overheat detection unit 51 including a thermistor that detects overheating of the feeding core 21c or the feeding coil 22c, and a feeding coil. An overcurrent detection circuit 52 that is connected in series to 22c and detects an overcurrent of the power feeding coil 22c, and an attachment / detachment detection unit 53 including a switch that is turned on or off by the attachment / detachment of the power receiving coil unit 30c, and further includes an overheat detection unit 51, a unit control circuit 54 to which detection signals from the overcurrent detection circuit 52 and the attachment / detachment detection unit 53 are input. The attachment / detachment detection unit 53 is substantially the same as the attachment / detachment detection switch button 26a.
Further, the feeding coil unit 20c includes three second terminals 55b, 55c, and 55d. The terminal 55b is a terminal that outputs a control signal from the unit control circuit 54, and the terminals 55c and 55d are power supply terminals that supply power (5 V) to the unit control circuit 54. The terminal 55b gives a control signal to the DC / AC converter 12 and controls the start or stop of the operation of the DC / AC converter 12. The terminals 55c and 55d are connected to an auxiliary power source 12e provided in the DC / AC converter 12, and supply 5V power.

FIG. 12 shows a circuit diagram of the unit control circuit 54.
As shown in FIG. 12, the overheat detection unit 51 is formed of a thermistor, and 5 V is applied from a 5 V power line 55c through an overcurrent prevention resistor 61 of 100 kΩ. The output of the thermistor is given to the non-inverting terminal of the comparator 62 and compared with the reference voltage 62a. When the thermistor detects an increase in temperature, the resistance value decreases, and the input voltage to the non-inverting terminal of the comparator 62 decreases. When the thermistor falls below the reference voltage, the comparator 62 outputs an H signal. The output of the comparator 62 is given to the OR circuit 63, and the OR circuit 63 outputs an off signal (H signal) when the H signal is inputted.

  In the overcurrent detection circuit 52, for example, the value of the current flowing through the power feeding coil 22 is detected as an analog signal by an overcurrent detection resistor and an error amplifier (not shown). This detection output is given to the inverting terminal of the comparator 64 and compared with the reference voltage 64a. Therefore, when the detection output of the overcurrent detection circuit 52 detects an overcurrent, the analog signal is input to the inverting terminal of the comparator 62, and when it is equal to or higher than the reference voltage, the comparator 64 outputs an H signal. The output of the comparator 64 is given to the OR circuit 63, and the OR circuit 63 outputs an off signal (H signal) when the H signal is inputted.

  The attachment / detachment detection unit 53 of the power receiving coil unit 30 includes the attachment / detachment detection switch button shown in FIG. 11, and short-circuits or opens the terminals 53a and 53b. The terminal 53a is connected to a 5V power supply line 55c through a 100 kΩ overcurrent prevention resistor 65, and the terminal 53b is short-circuited to the common electrode. Accordingly, when the attachment / detachment detection switch button is pressed and the terminals 53a and 53b are connected, an L signal is output to the OR circuit 63. When the terminals 53a and 53b are open, an H signal is output to the OR circuit 63.

  As described above, when an H signal is input from any of the overheat detection unit 51, the overcurrent detection circuit 52, and the attachment / detachment detection unit 53, the OR circuit 63 outputs an H signal (off signal) and all inputs. When the signal is an L signal, an L signal (ON signal) is output. The output terminal 55b of the OR circuit 63 is given to the DC / AC conversion unit 12 and controls the operation of the DC / AC conversion unit 12.

On the other hand, the power supply unit mounting portion 13 includes three insertion ports 13g, 13h, and 13i, and the three terminals 55b, 55c, and 55d pass through the insertion ports 13g, 13h, and 13i, and contacts 12b, 12c, and 12d, respectively.
The DC / AC conversion unit 12 of the socket unit 10 includes an auxiliary power source 12e inside, and outputs a voltage difference of 5 V between the plus terminal and the minus terminal (COM). The auxiliary power supply 12e is an insulated DCDC converter that converts, for example, direct current 380V input from the terminal 11 into 5V. A plus terminal 12e and a minus terminal 12f are connected to the contacts 12c and 12d from the auxiliary power source 12e, and a DC voltage of 5 V is supplied between the terminals 55c and 55D of the unit control circuit 54. The DC / AC converter 12 includes a controller that controls the operation of the DC / AC converter 12 inside.

When the overheat detection unit 51 and the overcurrent detection circuit 52 detect an abnormality, they send a detection signal to the unit unit control circuit 54. The unit control circuit 54 that has received the detection signal sends an abnormal signal to the DC / AC converter 12 through the terminal 55b and the contact 12b, and the received DC / AC converter 12 stops its operation. As described above, the unit control circuit 54 has a function of sending a control signal to the DC / AC converter 12.
Similarly, the attachment / detachment detection unit 53 includes a micro switch installed in the recess 24a of the power feeding coil unit unit 20. When the power receiving coil unit 30a is attached to the power feeding coil unit unit 20, the micro switch is turned on and the power receiving unit 53 receives power. It detects that the coil part 30a was mounted | worn with the electric power feeding coil unit part 20. FIG. In this way, when the attachment / detachment detection unit 53 recognizes that the power receiving coil unit 30 is mounted, it sends a detection signal to the unit unit control circuit 54, and the unit control circuit 54 sends a drive command to the DC / AC conversion unit 12. To do. When the power receiving coil unit 30 a is removed, the attachment / detachment detection unit 53 sends a signal to the unit unit control circuit 54, and the unit control circuit 54 sends a stop command to the DC / AC conversion unit 12.
This communication may be performed by serial communication using a single terminal, or a separate terminal may be provided for each signal, and communication may be performed for each detection using H and L logic signals. .

An overheat detection circuit 51 is provided inside the power feeding coil unit 20. The overheat detection circuit 51 can be detected by using a thermistor. In the overheat detection circuit 51, an overheat detection value is set for each power supply coil unit 20 based on the design of the power supply coil 22. When overheating exceeding the overheat detection value is detected, a detection signal is sent to the DC / AC conversion unit 12 to stop the operation of the DC / AC conversion unit 12.
For example, when the temperature reaches 60 ° C., the operation of the DC / AC converter is stopped. When the temperature reaches 40 ° C., hysteresis is provided so that the DC / AC converter automatically returns, and a return signal is sent to the DC / AC converter 12 to perform the operation. Let it resume.
The overheat detection circuit 51 is preferably provided in the immediate vicinity of the power supply coil 22 and in the immediate vicinity of the plug attachment / detachment position touched by the user's hand.
As a result, coil heat generation due to a large current flow or metal foreign matter mixed between the plug and socket and overheating is detected, and the operation of the DC / AC converter is stopped. Since power supply is stopped, it is possible to prevent ignition and user burns.
By making the power supply coil unit section 20 including the power supply coil 22 replaceable, the attachment / detachment section of the plug touched by the user is replaced with a plurality of types of units as a unit, so an overheat detection section is provided for each unit. Is preferred. Thereby, the primary side coil can be replaced, and a highly efficient and safe non-contact power supply outlet can be provided.

An overcurrent detection circuit 52 is provided inside the feeding coil unit section 20. The overcurrent detection circuit 52 is set with an overcurrent detection value for each power supply coil unit section 20 based on the design of the power supply coil 22. When an overcurrent greater than the overcurrent detection value is detected, that is, when a saturation current is detected, a detection signal is sent to the DC / AC converter 12 to stop the operation of the DC / AC converter 12.
The return operation is reset at the timing when a predetermined time elapses, and may automatically return to the normal operation state, or when a reset button is separately provided and the user or the person performing maintenance operates the reset button You may make it return.
The current value can be measured with a resistor or a current transformer. An overcurrent state can be detected by providing a reference voltage and a comparator, converting the measured current value into a voltage, and comparing it with a reference voltage set as an overcurrent limit value.

  When a large current flows through the power receiving coil 32 due to a short circuit failure of the load, the large current also flows through the power feeding coil 22, causing magnetic saturation, and further a large current flows. As a result, the power feeding coil 22 generates heat and becomes high temperature, which may cause a failure of a semiconductor component such as a transistor or a capacitor, or burn the user, which is dangerous. By providing the overcurrent detection circuit 52 in the feeding coil unit unit 20, the overcurrent detection value provided for each feeding coil unit unit 20 is referred to notify the DC / AC conversion circuit of the socket unit 10 of the abnormal state. Therefore, the socket portion 10 does not need to recognize the type of the feeding coil, and can have a simple configuration. With such a configuration, the power supply coil 22 of the power supply coil unit section 20 can be replaced, and a highly efficient and safe non-contact power supply outlet can be provided. Needless to say, an overcurrent detection circuit may be provided on the socket side, and a means for notifying the maximum rated current value to the feeding coil unit may be provided.

An attachment / detachment detection unit 53 for the power reception coil unit 30 is provided inside the power supply coil unit unit 20. The attachment / detachment detection unit 53 of the power receiving coil unit 30 starts the operation by notifying the DC / AC conversion unit 12 that the power feeding coil unit 30 is mounted on the power feeding coil unit unit 20, and the power receiving coil unit 30 is mounted. If not, the DC / AC converter 12 stops operating. By controlling in this way, power consumption can be reduced.
As shown in FIG. 11, the attachment / detachment detection of the power feeding coil unit unit 20 is performed, for example, when the power receiving coil unit 30 is attached, the attachment / detachment detection unit 53 is pushed, and an H signal is sent to the unit control circuit 54 shown in FIG. Is transmitted, and it is preferable that the L signal is input to the unit control circuit without pressing the attachment / detachment detection button.
By making the power supply coil unit including the power supply coil replaceable, the attachment / detachment part of the power reception unit (plug) is replaced as a power supply coil unit for each of a plurality of types of power supply coil units. It is preferable to provide an attachment / detachment detection unit for each. Thereby, the power supply coil can be replaced, and a highly efficient non-contact power supply outlet can be provided.

(Third embodiment)
FIG. 13 is a configuration diagram of the socket unit 10 used in the fourth embodiment. 11 differs from FIG. 11 in which the socket unit 10 of the fourth embodiment shows the socket unit 10 of the third embodiment. A unit unit control circuit 54 is provided in the socket unit 10, and an overheat detection unit 51, an overcurrent detection unit are provided. The difference is that the detection outputs of the circuit 52 and the attachment / detachment detection unit 53 are supplied to the unit control circuit 54 via terminals, but the other points are the same.

(Fourth embodiment)
FIG. 14 is a configuration diagram of the socket unit 10 used in the second embodiment. In the second embodiment, the feeding coil unit portion 20 is filled with a filler 13g having good thermal conductivity and insulation. Silicone resin is suitable as the filler 13g having good thermal conductivity. Further, the feeding coil unit portion 13 of the socket portion 10 is constituted by a metal casing such as aluminum having good thermal conductivity. It is more preferable to use a material having good thermal conductivity for the buffer material 13d. For example, silicon resin or the like can be used. Other parts are the same as those of the first embodiment.
According to the fourth embodiment, even if the power supply core 21 and the power supply coil 22 generate heat during power supply, the generated heat is dissipated through the filler 13g, the buffer material 13d, and the power supply coil unit 13, and the socket 10 To the wall 100. Since the heat dissipating area is improved, the temperature can be hardly increased. Moreover, if the filler 13g has good insulation, the insulation in the feeding coil unit portion 20 can be improved.

10 Socket part 11 Terminal 12 AC application circuit (DC / AC conversion part)
DESCRIPTION OF SYMBOLS 13 Feeding unit mounting part 20 Feeding coil unit part 21 Feeding core 22 Feeding coil 23 1st terminal 30 Power receiving coil part 31 Power receiving core 32 Power receiving coil 40 Load 51 Overheat detection part 52 Overcurrent detection circuit 53 Attachment / detachment detection part 54 Unit part control circuit

Claims (13)

A non-contact power feeding device that has a power feeding unit including a power feeding coil connected to a power source, and supplies power from the power source to the load by electromagnetically coupling the power feeding coil and the power receiving coil connected to the load,
The power feeding unit is
A socket portion having an AC application circuit and a power supply unit mounting portion;
A power supply coil unit having a power supply coil,
The non-contact power feeding apparatus according to claim 1, wherein the power feeding coil unit portion is replaceably mounted on the power feeding unit mounting portion. The power supply unit mounting portion has an opening,
Arrange the output terminal of the AC application circuit in the opening,
The non-contact power feeding device according to claim 1, wherein when the power feeding coil unit portion is mounted on the power feeding unit mounting portion, an input terminal of the power feeding coil unit portion is connected to the output terminal. The socket unit includes a control unit that controls the operation of the AC application circuit, and a feeding power detection unit that detects power fed to the feeding coil.
The feeding coil unit section has a feeding power maximum rating value notification means for notifying the AC application circuit of a feeding power maximum rating value,
The control unit controls the operation of the AC application circuit so that the power detected by the feed power detection means does not exceed the feed power maximum rating value notified by the feed power maximum rating value notification means. The non-contact electric power feeder of Claim 1 or 2 characterized by the above-mentioned. The socket part has a control part for controlling the operation of the AC application circuit,
The feeding coil unit has an overcurrent detection unit of the feeding coil,
The non-contact power feeding device according to claim 1, wherein the control unit controls the operation of the AC application circuit based on an overcurrent detection output that is output when the overcurrent detection unit detects an overcurrent. The power supply coil unit section has an overheat detection section,
5. The non-contact power feeding according to claim 1, wherein the control unit controls the operation of the AC application circuit based on an overheat detection output that is output when the overheat detection unit detects an overcurrent. apparatus. The power supply coil unit section includes a power receiving section attachment / detachment detection section,
6. The non-contact power feeding device according to claim 1, wherein the control unit controls the operation of the AC application circuit based on an attachment / detachment detection output output by the attachment / detachment detection unit.   7. The control unit according to claim 3, wherein the control unit stops the operation of the AC application circuit based on a maximum rated power supply value, the overcurrent detection output, the overheat detection output, or the attachment / detachment detection output. The non-contact electric power feeder of Claim 1. The feeding coil unit section has a feeding power maximum rating value notification section for notifying an AC application circuit of a feeding power maximum rating value,
The socket part has a control part for controlling the operation of the AC application circuit,
The said control part controls the operation | movement of the said AC application circuit so that a duty may be changed according to the ratio of the output electric power calculated from the electric power feeding maximum rated value, The any one of Claim 1-7 characterized by the above-mentioned. The non-contact electric power feeder of Claim 1. The feeding coil unit has a feeding power detection unit that detects power to be fed to a load,
The non-contact power supply device according to any one of claims 1 to 8, wherein the AC application circuit changes a duty of a pulse signal of the pulse signal generation device according to the power detected by the power supply power detection unit.   The non-contact power feeding device according to any one of claims 1 to 9, wherein the power feeding coil unit has a power receiving coil fixing portion at a portion where the power feeding coil is electromagnetically coupled to the power receiving coil.   The non-contact power feeding device according to any one of claims 1 to 10, wherein the power receiving coil fixing portion includes a tacking mechanism for attaching and detaching the power receiving coil portion.   The non-contact power feeding device according to claim 1, wherein the power feeding coil unit portion is filled with a filler. Consists of a power feeding unit including a power feeding coil connected to a power source and a power receiving unit including a power receiving coil. The power feeding coil and the power receiving coil connected to the load are electromagnetically coupled to supply power from the power source to the load. A contactless power supply system,
The power feeding unit is
A socket section having an AC application circuit, a power supply unit mounting section, and a control section;
A power supply coil, an output voltage information receiving unit that receives information on the output voltage from the power receiving unit, and a power supply side output voltage information transmitting unit that transmits information on the output voltage received by the output voltage information receiving unit to the control unit A power supply coil unit having
The power receiving unit
An output voltage detector;
A power receiving side output voltage information transmitting unit that transmits information on the output voltage detected by the output voltage detecting unit to the output voltage information receiving unit,
The control unit receives information on the output voltage transmitted from the power supply side output voltage transmission unit, and controls the operation of the AC application circuit based on the information on the output voltage. .

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