JP7519167B2 - Non-contact power supply device, non-contact power supply system including the same, non-contact power supply method, and non-contact power supply program - Google Patents

Description

The present invention relates to a non-contact power supply device, a non-contact power supply system including the same, a non-contact power supply method, and a non-contact power supply program.

2. Description of the Related Art In recent years, contactless power supply systems that wirelessly supply power from a power supply device to a power receiving device have come into use.
Some of such contactless power supply systems perform communication between a power receiving device and a power supply device, and power is supplied from the power supply device based on data received from the power receiving device via communication in the power supply device.

In such a configuration, the power receiving device is usually operated by a battery installed in the power receiving device. For this reason, if, for example, the remaining battery charge on the power receiving device side is almost zero, the positional relationship between the power supply device and the power receiving device is inappropriate (the distance between the power supply/power receiving coils is far or there is a large misalignment), the power supply efficiency of the contactless power supply is reduced and the power required to operate the power receiving device cannot be supplied, or the power receiving device is affected by external disturbances (crosstalk, noise, etc.), there is a risk of a shortage of power required for the power receiving device to operate. Therefore, there is a problem that wireless communication becomes unstable and power supply becomes unstable when the power receiving device stops functioning.

For example, Patent Document 1 discloses a power supply device that stops power supply to a power supply unit for a predetermined period of time and then resumes power supply to the power supply unit based on a wireless communication unit receiving signals from multiple power receiving devices in order to accurately supply power to the power receiving devices.

JP 2018-68008 A

However, the above-mentioned conventional power supply device has the following problems.
That is, in the power supply device disclosed in the above publication, when a signal from a power receiving device to be supplied with power and a signal from another power receiving device not to be supplied with power are received, power supply to the power receiving device to be supplied with power is resumed and power supply to the other power receiving device not to be supplied with power is stopped. In this way, since the communication unit receives only the signal from the power receiving device to be supplied with power, the power supply device can accurately receive power reception information from the power receiving device to be supplied with power and accurately supply power to the desired power receiving device.

However, this configuration does not take into consideration measures to ensure stable power supply to the power receiving device, for example, when the positional relationship between the power supply device and the power receiving device is inappropriate or when communication becomes unstable due to external disturbances.

The object of the present invention is to provide a contactless power supply device capable of stabilizing the communication state with the power receiving device and supplying power in a stable state, as well as a contactless power supply system, a contactless power supply method, and a contactless power supply program that include the contactless power supply device.

The non-contact power supply device according to the first invention is a non-contact power supply device that communicates with a power receiving device and supplies power to the power receiving device, and includes a power supply coil unit, a first communication unit, and a power supply control unit. The power supply coil unit supplies power to the power receiving device. The first communication unit communicates with the power receiving device. When the first communication unit starts receiving data transmitted from the power receiving device, if the magnitude of the radio wave intensity included in the data is smaller than a predetermined threshold, the power supply control unit performs a correction to increase the output value supplied from the power supply coil unit to the power receiving device.

Here, in a contactless power supply device that supplies power to a power receiving device while communicating with the power receiving device, when communication starts, a power supply control unit adjusts the output of power supplied from the power supply coil unit to the power receiving device based on the magnitude of the radio wave intensity of the data received from the power receiving device by the first communication unit.

More specifically, when the radio wave intensity of the data received from the power receiving device by the first communication unit is smaller than a predetermined threshold, the power supply control unit adjusts the output of power supplied from the power supply coil unit to the power receiving device to be larger.

Note that non-contact power supply means that there is no direct contact between the power supply coil section of the non-contact power supply device and the power receiving device (power receiving coil section), and power is supplied to the power receiving device wirelessly without using a cord or metal setting, etc.

As the contactless power supply system, an electromagnetic induction system or a magnetic resonance system may be adopted.
Here, for example, when the remaining battery charge on the power receiving device side is almost zero, when the positional relationship between the non-contact power supply device and the power receiving device is inappropriate, when there is an influence of disturbance such as noise, etc., the radio wave intensity included in the data received from the power receiving device may become weak due to a deteriorated communication environment. In this case, the data transmitted from the power receiving device cannot be received in a stable state, and therefore, there is a risk that power cannot be stably supplied to the power receiving device.

In this non-contact power supply device, if the communication environment is poor when communication starts and the radio wave strength of the received data is lower than a predetermined threshold, the power supply control unit corrects the output value of the power supplied from the power supply coil unit to the power receiving device to be larger.

As a result, even if the communication environment is poor due to, for example, an inappropriate positional relationship between the non-contact power supply device and the power receiving device, the output to the power receiving device can be corrected to be larger, thereby improving the communication environment with the power receiving device and enabling stable power supply.
As a result, the state of communication with the power receiving device can be stabilized, and power can be fed in a stable state.

The non-contact power supply device according to the second invention is the non-contact power supply device according to the first invention, in which the power supply control unit compares the average value of the multiple radio wave intensities contained in the multiple data received by the first communication unit with a threshold value to correct the output value.

Here, when comparing the signal strength that has decreased due to the deterioration of the communication environment described above with a predetermined threshold, the average value of multiple signal strengths contained in multiple data received 10 times in succession is calculated, for example, and compared with the predetermined threshold.

This allows the average value of the radio wave strength of multiple received data to be calculated and compared with a predetermined threshold value, thereby avoiding correction of the output value when, for example, the radio wave strength temporarily drops, and enabling more stable power supply to the power receiving device.

The non-contact power supply device according to the third invention is the non-contact power supply device according to the first or second invention, and further includes a memory unit that stores a correction table showing the relationship between the correction factor used to correct the output value and the radio wave intensity.

Here, a storage unit is provided that stores a correction table that indicates the relationship between the value of radio field intensity that is determined to be smaller than a predetermined threshold value and the correction factor used when correcting the output value.
As a result, when the radio wave intensity contained in the data received from the power receiving device is smaller than a predetermined threshold, the power supply control unit can easily obtain a correction rate for correcting the output value by referring to the correction table stored in the memory unit.

A contactless power supplying device according to a fourth aspect of the present invention is the contactless power supplying device according to the third aspect of the present invention, wherein the power supply control unit determines the correction factor by referring to the correction table stored in the storage unit.
Here, the power supply control unit refers to the correction table stored in the storage unit to determine the correction factor used to correct the output value.
This makes it possible to easily obtain the correction factor required for correcting the output value by using the correction table stored in the storage unit.

The contactless power supply device according to the fifth invention is a contactless power supply device according to any one of the first to fourth inventions, further comprising a DC input section to which power is input from a power source, a DC/AC circuit that supplies the DC power input to the DC input section as AC power to the power supply coil section, and a DC/AC control section that controls the DC/AC circuit based on a signal received from the power supply control section.

Here, for example, the device further includes a DC input unit to which power is input from an external power source such as an outlet, a DC/AC circuit that converts DC power into AC power, and a DC/AC control unit that controls the AC power supplied to the power supply coil unit based on a signal received from the power supply control unit.
This allows the DC/AC control unit to appropriately control the magnitude of the AC power (output) supplied from the DC/AC circuit to the power feeding coil unit.

The non-contact power supply device according to the sixth invention is a non-contact power supply device according to any one of the first to fifth inventions, in which the power supply control unit corrects the output value by duty control of PWM (Pulse-Width-Modulation).

Here, the power (output) supplied to the power supply coil is corrected by PWM duty control.
This makes it possible to easily adjust the output of power supplied to the power supply coil by modulating the pulse width.

The contactless power supply device according to the seventh invention is a contactless power supply device according to any one of the first to sixth inventions, in which the power supply control unit, when activated, supplies power at a second output that is lower than the first output when supplying power to the power receiving device until communication is received from the power receiving device.

Here, after the contactless power supply device is activated, until communication with the power receiving device is received, power is supplied at a second output lower than the first output when power is supplied to the power receiving device.
That is, the power supply control unit supplies low-output power from the contactless power supply device until the power receiving device is placed in a position where power can be supplied to the contactless power supply device.

As a result, a power receiving device placed in a position where it can receive power from a contactless power supply device can transmit data to the first communication unit of the contactless power supply device through low-power supply even when, for example, the remaining battery charge on the power receiving device side is almost zero or the placement of the power receiving device is not suitable for the contactless charging device.

The non-contact power supply device according to the eighth invention is the non-contact power supply device according to the seventh invention, in which the power supply control unit performs authentication processing to determine whether the power receiving device is authenticated as a power supply target based on data received from the power receiving device when power is supplied at the second output.

Here, an authentication process is performed to authenticate that the power receiving device is a power receiving device to be supplied with power, based on various information (e.g., the ID of the power receiving device) included in the data received from the power receiving device that received low-output power supply.
As a result, after authenticating that the power receiving device is a power receiving device to be supplied with power, stable power supply can be performed to an appropriate power receiving device.

The non-contact power supply device according to the ninth invention is the non-contact power supply device according to the eighth invention, and the power supply control unit performs a correction process to increase the second output if the power receiving device is not authenticated as a power supply target in the authentication process, and performs authentication again to determine whether the power receiving device is authenticated as a power supply target based on the data received from the power receiving device.

Here, even if authentication using data received from the power receiving device due to low-output power supply results in a non-authenticated result, a correction process is performed to increase the second output in anticipation of cases where authentication is not successful due to reasons such as a deterioration in the communication environment, and re-authentication is performed again using the data received from the power receiving device.

As a result, even if authentication using data received from a power receiving device due to low-output power supply determines that the device is not authenticated, stable power supply can be provided to an appropriate power receiving device by re-authenticating the power receiving device that was not authenticated due to reasons such as a deterioration in the communication environment.

The non-contact power supply system according to the tenth invention includes a non-contact power supply device according to any one of the first to ninth inventions, and a power receiving device that communicates with the non-contact power supply device and receives power from the non-contact power supply device.

Here, a contactless power supply system is configured that includes the above-mentioned contactless power supply device and a power receiving device that communicates with the contactless power supply device and receives power.
This makes it possible to obtain a contactless power supply system that can stabilize the communication state between the contactless power supply device and the power receiving device and supply power in a stable state.

The non-contact power supply system according to the eleventh invention is the non-contact power supply system according to the tenth invention, in which the power receiving device includes a power receiving coil section that receives power from a power supply coil section, a battery that stores the power supplied to the power receiving coil section, a second communication section that communicates with the first communication section, and a power receiving control section that controls the output from the power receiving coil section to the battery.

Here, the power receiving device side is provided with a receiving coil unit, a battery that stores the power supplied to the receiving coil unit, a second communication unit that communicates with the non-contact power supply device side, and a power receiving control unit that controls the output from the receiving coil unit to the battery.
This allows the power supplied from the power supply coil section to the power receiving coil section to be stored in the battery while the first communication section and the second communication section on the contactless power supply device side are communicating with each other.

The non-contact power supply system according to the twelfth invention is the non-contact power supply system according to the eleventh invention, in which the power receiving device further includes a state detection unit that detects the power supplied to the power receiving coil unit.

Here, in the power receiving device, the state detection unit detects whether the power supplied from the power supply coil unit on the non-contact power supply device side to the power receiving coil unit has reached a specified power required on the power receiving device side.

As a result, depending on the detection result in the state detection unit, it is possible to determine, for example, whether or not to store the power supplied to the power receiving coil unit in the battery. Or, for example, the second communication unit can notify the first communication unit on the contactless power supply device side that the supplied power is insufficient.

The non-contact power supply system according to the thirteenth invention is the non-contact power supply system according to the twelfth invention, in which the power receiving control unit controls the output from the power receiving coil unit to the battery based on the amount of power detected by the state detection unit, and notifies the second communication unit.

Here, the power receiving control section uses the detection result from the state detection section to control whether or not to output from the power receiving coil section to the battery, and notifies the second communication section of the detection result.
More specifically, if the amount of power detected by the status detection unit is less than the amount of power required by the power receiving device, the receiving coil unit is controlled so as not to output power to the battery, and the detection result is notified to the second communication unit.

This allows the system to determine whether or not power can be stored in the battery based on the detection results from the state detection unit, and to communicate to the non-contact power supply device via the second communication unit that there is a shortage of power supply.

The non-contact power supply method according to the fourteenth invention is a non-contact power supply method in which communication is performed between a non-contact power supply device and a power receiving device, and power is supplied from the non-contact charging device to the power receiving device, and includes a communication step, a comparison step, and an output correction step. The communication step transmits data from a second communication unit of the power receiving device to a first communication unit of the non-contact power supply device. The comparison step compares the magnitude of the radio wave intensity included in the data with a predetermined threshold when the first communication unit starts receiving the data transmitted from the second communication unit. The output correction step performs a correction to increase the output value supplied from the power supply coil unit of the non-contact power supply device to the power receiving coil unit of the power receiving device when the magnitude of the radio wave intensity included in the data is smaller than the predetermined threshold as a result of comparing the magnitude of the radio wave intensity included in the data with the predetermined threshold.

Here, in a non-contact power supply method using a non-contact power supply device that supplies power to a power receiving device while communicating with the power receiving device, the output of power supplied from the power supply coil unit to the power receiving device is adjusted at the start of communication based on the magnitude of the radio wave intensity of data received from the power receiving device by the first communication unit.

More specifically, when the radio wave intensity of the data received from the power receiving device by the first communication unit is smaller than a predetermined threshold, the output of power supplied from the power supply coil unit to the power receiving device is adjusted to be larger.

Note that non-contact power supply means that there is no direct contact between the power supply coil section of the non-contact power supply device and the power receiving device (power receiving coil section), and power is supplied to the power receiving device wirelessly without using a cord or metal setting, etc.

As the contactless power supply system, an electromagnetic induction system or a magnetic resonance system may be adopted.
Here, for example, when the remaining battery charge on the power receiving device side is almost zero, when the positional relationship between the non-contact power supply device and the power receiving device is inappropriate, when there is an influence of disturbance such as noise, etc., the radio wave intensity included in the data received from the power receiving device may become weak due to a deteriorated communication environment. In this case, the data transmitted from the power receiving device cannot be received in a stable state, and therefore, there is a risk that power cannot be stably supplied to the power receiving device.

In this non-contact power supply method, if the communication environment is poor when communication starts and the radio wave strength of the received data is smaller than a predetermined threshold, the output value of the power supplied from the power supply coil to the power receiving device is corrected to be larger.

As a result, even if the communication environment is poor due to, for example, an inappropriate positional relationship between the non-contact power supply device and the power receiving device, the output to the power receiving device can be corrected to be larger, thereby improving the communication environment with the power receiving device and enabling stable power supply.
As a result, the state of communication with the power receiving device can be stabilized, and power can be fed in a stable state.

The non-contact power supply method according to the fifteenth invention is the non-contact power supply method according to the fourteenth invention, in which in the output correction step, the average value of the multiple radio wave intensities contained in the multiple data received by the first communication unit is compared with a threshold value to correct the output value.

Here, in the output correction step, when comparing the radio wave strength that has decreased due to a deterioration in the communication environment with a predetermined threshold, the average value of multiple radio wave strengths contained in multiple data received 10 times in succession is calculated and compared with the predetermined threshold.

This allows the average value of the radio wave strength of multiple received data to be calculated and compared with a predetermined threshold value, thereby avoiding correction of the output value when, for example, the radio wave strength temporarily drops, and enabling more stable power supply to the power receiving device.

The non-contact power supply method according to the sixteenth aspect of the present invention is the non-contact power supply method according to the fourteenth or fifteenth aspect of the present invention, and in the output correction step, a correction table stored in a memory unit of the non-contact power supply device is referenced to calculate a correction factor used to correct the output value.

Here, a correction table showing the relationship between the value of the radio field intensity determined to be smaller than a predetermined threshold value and the correction factor used to correct the output value is stored in the memory unit of the contactless power supply device.

As a result, in the output correction step, if the radio wave intensity contained in the data received from the power receiving device is smaller than a predetermined threshold, the correction table stored in the memory unit can be referenced to easily obtain a correction rate for correcting the output value.

The non-contact power supply method according to the seventeenth aspect of the present invention is a non-contact power supply method according to any one of the fourteenth to sixteenth aspects of the present invention, in which in the output correction step, the output value is corrected by duty control of PWM (Pulse-Width-Modulation).

Here, the power (output) supplied to the power supply coil is corrected by PWM duty control.
This makes it possible to easily adjust the output of power supplied to the power supply coil by modulating the pulse width.

The contactless power supply method according to the eighteenth invention is a contactless power supply method according to any one of the fourteenth to seventeenth inventions, and further includes a low-output power supply step of supplying power at a second output lower than the first output when supplying power to the power receiving device after activation, until communication is received from the power receiving device.

Here, after the contactless power supply device is activated, power is supplied at a second output lower than the first output when supplying power to the power receiving device until communication with the power receiving device is received.
That is, the power supply control unit supplies low-output power from the contactless power supply device until the power receiving device is placed in a position where power can be supplied to the contactless power supply device.

As a result, a power receiving device placed in a position where it can receive power from a contactless power supply device can transmit data to the first communication unit of the contactless power supply device through low-power supply even when, for example, the remaining battery charge on the power receiving device side is almost zero or the placement of the power receiving device is not suitable for the contactless charging device.

The non-contact power supply method according to the 19th invention is a non-contact power supply method according to any one of the 14th to 18th inventions, and further includes an authentication step for performing an authentication process to determine whether or not the power receiving device is authenticated as a power supply target based on data received from the power receiving device during power supply at the second output.

Here, an authentication process is performed to authenticate that the power receiving device is a power receiving device to be supplied with power, based on various information (e.g., the ID of the power receiving device) included in the data received from the power receiving device that received low-output power supply.
As a result, after authenticating that the power receiving device is a power receiving device to be supplied with power, stable power supply can be performed to an appropriate power receiving device.

The non-contact power supply method according to the 20th invention is the non-contact power supply method according to the 19th invention, and if the power receiving device is not authenticated as a power supply target in the authentication step, a correction process is performed to increase the second output, and authentication process is performed again based on data received from the power receiving device to determine whether the power receiving device is authenticated as a power supply target.

Here, even if authentication using data received from the power receiving device due to low-output power supply results in a non-authenticated result, a correction process is performed to increase the second output in anticipation of cases where authentication is not successful due to reasons such as a deterioration in the communication environment, and re-authentication is performed again using the data received from the power receiving device.

As a result, even if authentication using data received from a power receiving device due to low-output power supply determines that the device is not authenticated, stable power supply can be provided to an appropriate power receiving device by re-authenticating the power receiving device that was not authenticated due to reasons such as a deterioration in the communication environment.

The non-contact power supply program according to the twenty-first invention is a non-contact power supply program for communicating between a non-contact power supply device and a power receiving device to supply power from a non-contact charging device to the power receiving device, and causes a computer to execute a non-contact power supply method including a communication step, a comparison step, and an output correction step. The communication step transmits data from a second communication unit of the power receiving device to a first communication unit of the non-contact power supply device. The comparison step compares the magnitude of the radio wave intensity included in the data with a predetermined threshold when the first communication unit starts receiving data transmitted from the second communication unit. The output correction step performs a correction to increase the output value supplied from the power supply coil unit of the non-contact power supply device to the power receiving coil unit of the power receiving device when the magnitude of the radio wave intensity included in the data is smaller than the predetermined threshold as a result of comparing the magnitude of the radio wave intensity included in the data with the predetermined threshold.

Here, in a non-contact power supply method using a non-contact power supply device that supplies power to a power receiving device while communicating with the power receiving device, the output of power supplied from the power supply coil unit to the power receiving device is adjusted at the start of communication based on the magnitude of the radio wave intensity of data received from the power receiving device by the first communication unit.

More specifically, when the radio wave intensity of the data received from the power receiving device by the first communication unit is smaller than a predetermined threshold, the output of power supplied from the power supply coil unit to the power receiving device is adjusted to be larger.

Note that non-contact power supply means that there is no direct contact between the power supply coil section of the non-contact power supply device and the power receiving device (power receiving coil section), and power is supplied to the power receiving device wirelessly without using a cord or metal setting, etc.

As the contactless power supply system, an electromagnetic induction system or a magnetic resonance system may be adopted.
Here, for example, when the remaining battery charge on the power receiving device side is almost zero, when the positional relationship between the non-contact power supply device and the power receiving device is inappropriate, when there is an influence of disturbance such as noise, etc., the radio wave intensity included in the data received from the power receiving device may become weak due to a deteriorated communication environment. In this case, the data transmitted from the power receiving device cannot be received in a stable state, and therefore, there is a risk that power cannot be stably supplied to the power receiving device.

In this non-contact power supply method, if the communication environment is poor when communication starts and the radio wave strength of the received data is smaller than a predetermined threshold, the output value of the power supplied from the power supply coil to the power receiving device is corrected to be larger.

As a result, even if the communication environment is poor due to, for example, an inappropriate positional relationship between the non-contact power supply device and the power receiving device, the output to the power receiving device is corrected to be larger, improving the communication environment with the power receiving device and enabling stable power supply.

As a result, the communication state with the power receiving device can be stabilized, and power can be supplied in a stable state.

The non-contact power supply device according to the present invention can stabilize the communication state with the power receiving device and supply power in a stable state.

1 is a control block diagram showing a configuration of a contactless power supply system including a contactless power supply device according to an embodiment of the present invention. 5 is a flowchart showing a process flow at the time of startup of the contactless power supply device. 6 is a flowchart showing a flow of processing on the power receiving device side. 10 is a flowchart showing a flow of processing such as message analysis on the contactless power supply device side. 10 is a flowchart showing a process flow for performing correction by comparing an average value with a threshold value on the contactless power supply device side. 2 is a diagram showing a correction table stored in a storage unit of the contactless power supply device of FIG. 1 .

The following describes a non-contact power supply system 30 including a non-contact power supply device 10 according to one embodiment of the present invention, and a non-contact power supply method, with reference to Figures 1 to 6.

(Configuration of the non-contact power supply system 30)
The non-contact power supply system 30 of this embodiment is a system that supplies power from the non-contact power supply device 10 to the power receiving device 20 while communicating between the non-contact power supply device 10 and the power receiving device 20. As shown in FIG. 1, the wireless communication unit 16 on the non-contact power supply device 10 side and the wireless communication unit 28 on the power receiving device 20 side communicate with each other, and power is supplied from the power supply coil unit 13 arranged close to each other to the power receiving coil unit 21.

In this embodiment, non-contact power supply means that the power supply coil section 13 on the non-contact power supply device 10 side and the power receiving coil section 21 on the power receiving device 20 side are not in direct contact with each other, and power is supplied from the non-contact power supply device 10 to the power receiving device 20 wirelessly without using a cord, metal setting, etc.

The configurations of the contactless power supply device 10 and the power receiving device 20 will be described in detail later.
In this embodiment, the power receiving device 20 supplied with power by the contactless power supply device 10 includes various devices such as flying devices such as drones equipped with a chargeable and dischargeable battery inside, electric vehicles such as electric motorcycles, power tools such as lawnmowers and work tools, vacuum cleaners, robots, etc., but the power receiving device 20 is not limited to the devices listed here.

(Configuration of the non-contact power supply device 10)
As shown in FIG. 1 , the contactless power supply device 10 includes a DC input unit 11, a DC/AC circuit 12, a power supply coil unit 13, a DC/AC control unit 14, a power supply control unit 15, a wireless communication unit 16, and a memory unit 17.

The DC input unit 11 receives DC (direct current) power via an external outlet 11a (see FIG. 1).
1 , the DC/AC circuit 12 is connected to the DC input unit 11, the DC/AC control unit 14, and the power supply coil unit 13. The DC/AC circuit 12 converts the DC power input to the DC input unit 11 into AC (alternating current) power, and is controlled to adjust the output (amount of power supply) to the power supply coil unit 13 based on an instruction input from the DC/AC control unit 14.

As shown in FIG. 1, the power supply coil unit 13 is connected to the DC/AC circuit 12, and generates a magnetic flux using the AC current output from the DC/AC circuit 12 to supply power to the power receiving coil unit 21 on the power receiving device 20 side located nearby.

The method of power supply from the non-contact power supply device 10 to the power receiving device 20 is not limited to the electromagnetic induction method, and other methods such as a resonance method may be adopted.
As shown in FIG. 1 , the DC/AC control unit 14 is connected to the DC/AC circuit 12 and the power supply control unit 15 , and controls the DC/AC circuit 12 based on an instruction input from the power supply control unit 15 .

As shown in FIG. 1, the power supply control unit 15 is connected to the DC/AC control unit 14, the wireless communication unit 16, and the storage unit 17, and is composed of a CPU and other circuits. The power supply control unit 15 corrects the output (amount of power supply) to the power receiving device 20 based on the radio wave intensity included in the data received via the wireless communication unit 16.

More specifically, if the average value of the radio wave intensity included in the data received from the power receiving device 20 is smaller than a predetermined threshold, the power supply control unit 15 instructs the DC/AC control unit 14 to correct the amount of power supply to be output.

The correction of the power supply amount is performed by duty control of PWM (Pulse-Width-Modulation).
1, the wireless communication unit 16 is connected to the power supply control unit 15, and communicates with a wireless communication unit 28 on the power receiving device 20 side, and transmits data received from the power receiving device 20 side to the power supply control unit 15. The wireless communication unit 16 detects the radio wave intensity of the data received from the power receiving device 20 side.

Note that communication between the wireless communication unit 16 on the non-contact power supply device 10 side and the wireless communication unit 28 on the power receiving device 20 side may be performed using, for example, the 2.4 GHz band (2402 to 2480 MHz).

As shown in FIG. 1, the storage unit 17 is connected to the power supply control unit 15, and stores a correction table (see FIG. 6) for obtaining a correction factor used to correct the power supply value, which will be described later.
The process of feeding power from the non-contact power feeding device 10 to the power receiving device 20 based on the radio wave intensity of the data received by the wireless communication unit 16 will be described in detail later.

(Configuration of power receiving device 20)
As shown in FIG. 1, the power receiving device 20 includes a power receiving coil unit 21, a rectifier circuit 22, a DC/DC circuit 23, a DC/DC control unit 24, a battery (load) 25, a status detection unit 26, a power receiving control unit 27, and a wireless communication unit 28.

As shown in FIG. 1, the power receiving coil unit 21 is connected to the rectifier circuit 22, and an induced electromotive force is generated by the magnetic flux generated in the power supply coil unit 13 on the side of the non-contact power supply device 10 arranged nearby. The power receiving coil unit 21 then transmits the power received from the non-contact power supply device 10 to the rectifier circuit 22.

As shown in FIG. 1, the rectifier circuit 22 is connected to the receiving coil unit 21, the DC/DC circuit 23, and the state detection unit 26, and rectifies the AC power received from the receiving coil unit 21 into DC power.

As shown in FIG. 1, the DC/DC circuit 23 is connected to the rectifier circuit 22, the DC/DC control unit 24, and the battery 25, and performs switching based on instruction input from the DC/DC control unit 24 to control the output to the battery 25.

As shown in FIG. 1, the DC/DC control unit 24 is connected to the DC/DC circuit 23 and the power receiving control unit 27, and controls the switching operation of the DC/DC circuit 23 based on instruction input from the power receiving control unit 27.

The battery 25 is a chargeable and dischargeable secondary battery, and as shown in FIG. 1, is connected to the DC/DC circuit 23 and stores the DC power output from the DC/DC circuit 23 .
As shown in FIG. 1 , the state detection unit 26 is connected to the rectifier circuit 22 and the power receiving control unit 27 , detects the voltage and current values between the rectifier circuit 22 and the DC/DC circuit 23 , and notifies the power receiving control unit 27 .

As shown in FIG. 1, the power receiving control unit 27 is connected to the DC/DC control unit 24, the state detection unit 26, and the wireless communication unit 28. The power receiving control unit 27 compares the voltage value and current value detected by the state detection unit 26 with a preset reference voltage value and reference current value, and if the voltage value and current value are greater than the reference voltage value and reference current value, it determines that there is no problem with the amount of received power, and notifies the DC/DC control unit 24 to output the power from the DC/DC circuit 23 to the battery 25. The power receiving control unit 27 also transmits the voltage value and current value detected by the state detection unit 26 to the wireless communication unit 28.

The wireless communication unit 28 is configured with a circuit including a CPU, and is connected to the power receiving control unit 27 as shown in FIG. 1. The wireless communication unit 28 then transmits a message including the data received from the power receiving control unit 27 (such as the voltage value and current value of the received power) to the wireless communication unit 16 on the contactless power supply device 10 side.

<Start-up process of the non-contact power supply device 10>
The startup process (low-output power supply) performed in the contactless power supply device 10 of this embodiment will be described below with reference to the flowchart shown in FIG.

In other words, in the non-contact power supply device 10 of this embodiment, as a preliminary process before power is supplied to the power receiving device 20 to be supplied with power, the device outputs a power lower than the normal power supply and waits until the power receiving device 20 is located in a position where communication is possible.

Specifically, as shown in FIG. 2, when the power supply of the non-contact power supply device 10 is turned on, in step S11, regardless of whether the power receiving device 20 is located within a communication range or not, power is supplied at a lower power (low-output power supply) than the power normally supplied to the power receiving device 20.

Here, the power supply control unit 15 instructs the DC/AC control unit 14 to reduce the output from the DC/AC circuit 12. This causes the power supply coil unit 13 to output a lower power than during normal power supply.

This low-power supply continues after the non-contact power supply device 10 is started, for example, until wireless communication is received from a power receiving device 20 located within the communication range, or until the power supply of the non-contact power supply device 10 is turned off.

Next, in step S12, the wireless communication unit 16 waits until it receives wireless communication (data) from the wireless communication unit 28 of the power receiving device 20 that is supplied with low power output, and when it receives wireless communication (data) from the wireless communication unit 28 of the power receiving device 20, it proceeds to step S13.

Next, in step S13, the power supply control unit 15 performs a process of checking whether or not authentication has been performed to confirm whether or not the communication is from the power receiving device 20 that is the target of power supply based on the information received from the power receiving device 20. If the power supply control unit 15 determines that the power receiving device 20 is authenticated as the target of power supply, the process proceeds to the process flow shown in FIG. 5 in order to supply normal power. On the other hand, if authentication is not possible, the process proceeds to step S14.

Here, possible reasons for failure to authenticate include communication with a device that is not the target of power supply, the power supplied by low-output power supply being insufficient for stable communication, etc. For this reason, in steps S14 and S15, processing is performed to rescue the power receiving device 20 that cannot be authenticated for the latter reason.

That is, in step S14, the power supply control unit 15 determines whether the correction rate has reached the upper limit in order to check whether the low-output power supply to the power receiving device 20 that was not authenticated in step S13 is at maximum output.

If the correction rate has not reached the upper limit, the output of the low-output power supply is increased by one step, and the process proceeds to step S15 to retry authentication again to see if it is possible.
On the other hand, if the correction rate has reached the upper limit, it is unlikely that authentication was not successful because insufficient power was supplied, preventing sufficient communication, and therefore the power supply control unit 15 determines that the communication is with a device that is not a target for power supply, and terminates the process without supplying power.

Next, in step S15, the power supply control unit 15 increases the correction factor, performs low-power power supply again, and waits until receiving a radio signal in step S12.
The processes from step S12 to step S15 are repeatedly performed until the power receiving device 20 is authenticated or until the correction rate for low-output power supply reaches the upper limit.

<Processing in Power Receiving Device 20>
Next, the process on the power receiving device 20 side, which receives low-output power supply from the contactless power supply device 10 described above, performs communication, and is authenticated by the contactless power supply device 10, will be described below with reference to the flowchart shown in FIG.

That is, as shown in FIG. 3, in step S21, the power receiving coil section 21 of the authenticated power receiving device 20 receives the power output from the power supply coil section 13 of the non-contact power supply device 10.

Next, in step S22, the rectifier circuit 22 rectifies the AC power received by the power receiving coil section 21 into DC power and outputs it to the DC/DC circuit 23 and the state detection section 26.
Next, in step S23, the state detection unit 26 detects the voltage value and the current value of the received power.

Next, in step S24, the power reception control unit 27 determines whether or not the voltage value and the current value detected by the state detection unit 26 are equal to or greater than a predetermined value.
If the received power is equal to or greater than the predetermined value, the process proceeds to step S25. If the received power is less than the predetermined value, the process proceeds to step S27 in order to notify the non-contact power supply device 10 that the received power is insufficient, without charging the battery 25 with power.

Next, in step S25, since the power receiving control unit 27 has confirmed in step S24 that the received power is equal to or greater than a predetermined value, the DC/DC control unit 24 controls the DC/DC circuit 23 to perform DC/DC conversion and output the power to the battery 25.

Next, in step S26, the power output from the DC/DC circuit 23 is charged into the battery 25.
Next, in step S27, the power reception control unit 27 creates a message including data such as the voltage value and current value detected from the received power by the state detection unit 26.

Next, in step S28, the power receiving control unit 27 controls the wireless communication unit 28 to transmit a message including data such as the received power (voltage value and current value) created by the power receiving control unit 27 to the wireless communication unit 16 on the contactless power supply device 10 side. Then, when the process of step S28 is completed, the processes of steps S21 to S28 are repeated again.

Here, the received power (voltage value and current value) included in the message transmitted from the wireless communication unit 28 to the non-contact power supply device 10 side is used by the non-contact power supply device 10 side to verify whether the supplied power is sufficient for the power receiving device 20 side. Therefore, in the non-contact power supply device 10, if the power value (voltage value and current value) received from the power receiving device 20 side is not sufficient for the power receiving device 20 side, the output is increased and the power is supplied.

<Message Analysis Processing in Contactless Power Supply Device 10>
The analysis process of the message received from the power receiving device 20, which is performed in the wireless communication unit 16 of the contactless power supply device 10 of this embodiment, will be described below with reference to the flowchart shown in FIG.

That is, as shown in FIG. 4 , in step S<b>31 , the wireless communication unit 16 receives a message created in the power receiving device 20 from the wireless communication unit 28 of the power receiving device 20 .
Next, in step S32, the received message is analyzed in the wireless communication unit 16. More specifically, the wireless communication unit 16 acquires the power (voltage value and current value) received by the power receiving device 20 through message analysis, and performs control so as to cut off communication with devices other than the target of power supply.

Next, in step S33, the wireless communication unit 16 analyzes the radio wave intensity of the wireless communication contained in the received message.
Next, in step S34, the wireless communication unit 16 notifies the power supply control unit 15 of the analysis result of the message including data such as the received voltage value and current value, and the analysis result of the radio wave intensity.

The analysis process of the radio wave intensity and the like contained in the message may be performed in the wireless communication unit 16 including a circuit such as a CPU, as in this embodiment, or may be performed in the power supply control unit 15.

In step S35, the power supply control unit 15 determines whether the power supplied to the power receiving device 20 is appropriate based on the analysis result of the message notified in step S34, and if it is not appropriate, performs feedback control to adjust the output value so that the supplied power is appropriate.

<Output Correction Processing in the Contactless Power Supply Device 10>
In the non-contact power supply device 10 of this embodiment, the power supply output correction process based on the radio wave intensity of the data received from the power receiving device 20, which is performed when communication with the power receiving device 20 is started, will be explained below using the flowchart shown in Figure 5.

That is, as shown in FIG. 5, in step S41, the wireless communication unit 16 waits until it receives a wireless communication from the power receiving device 20, and when it receives a wireless communication, the process proceeds to step S42.
Next, in step S42, it is determined the value of the radio wave intensity of the data received by the wireless communication unit 16. More specifically, it is determined whether the value of the radio wave intensity of the data received by the wireless communication unit 16 is -50 dBm or more.

If the radio wave strength of the received data is -50 dBm or more, it is determined that data with a radio wave strength in the range requiring correction has been received, and the process proceeds to step S43. On the other hand, if the radio wave strength of the received data is less than -50 dBm, it is determined that the radio wave strength is even lower than the radio wave strength requiring correction, and therefore correction is not possible, and the process returns to step S41 without performing correction processing.

Note that the threshold value used for the judgment in step S42 is not limited to -50 dBm, but may be set to a value greater than -50 dBm or less than -50 dBm.

Next, in step S43, data is acquired until the number of communications between the wireless communication unit 16 of the contactless power supply device 10 and the wireless communication unit 28 of the power receiving device 20 reaches a predetermined number of samplings.
In this embodiment, since the number of sampling times is set to 10, the process of step S43 is repeated until data for 10 communications is received from the power receiving device 20.

Next, in step S44, the power supply control unit 15 calculates the average value of the radio wave intensity of the data received by the wireless communication unit 16 for ten times.
Next, in step S45, the power supply control unit 15 determines whether or not the average value of the radio wave intensity calculated in step S44 is equal to or greater than a predetermined threshold value (-40 dBm).

If the average radio wave strength is -40 dBm or greater, it is determined that normal communication is occurring, and the process proceeds to step S47. On the other hand, if the average radio wave strength is less than -40 dBm, it is determined that normal communication may not be occurring, and the process proceeds to step S46.

In this embodiment, the predetermined threshold is set to −40 dBm as a value at which normal communication can be performed.
It should be noted that the threshold value used for the judgment in step S45 is not limited to -40 dBm, and may be set to a value greater than -40 dBm, or may be set to a value less than -40 dBm, as long as the value is greater than the threshold value used in step S42.

Next, in step S46, since it was determined in step S45 that the average value of the radio wave strength is less than -40 dBm, the power supply control unit 15 refers to the correction table stored in the memory unit 17 and obtains the correction factor to be used for output correction control.

The correction table stored in the memory unit 17 shows the relationship between the radio wave strength (dBm) in the range of -50 to -40 dBm calculated as the average value of 10 pieces of data, and the correction rate (%) used for output correction control, as shown in Figure 6.

In the correction table shown in Figure 6, for example, if the average radio wave strength is -40 dBm, it is assumed that normal and stable communication is taking place, so the correction rate is set to 100%.

In addition, if the average radio wave strength is -45 dBm, it is assumed that communication is somewhat unstable, so the correction rate is set to 125%. As a result, when the communication state is somewhat unstable, a correction rate is selected that increases the output power supplied to the power receiving device 20.

Furthermore, if the average radio wave strength is -50 dBm, it is assumed that unstable communication is taking place, so the correction rate is set to 150%. As a result, if the communication state becomes unstable, a correction rate is selected that further increases the output power supplied to the power receiving device 20.

The power supply control unit 15 can therefore easily obtain the optimal correction rate corresponding to the radio wave strength calculated as the average value by referring to the correction table shown in FIG. 6 stored in the memory unit 17.

When the average value of the radio field strength is greater than -40 dBm, it is assumed that normal communication is taking place, just as when the strength is -40 dBm, and therefore all correction factors are set to 100%.
That is, if the average value of the radio field strength is -40 dBm or more in step S45, a correction rate of 100% is selected for all, and essentially no output correction is performed during power supply.

Next, in step S47, the power supply control unit 15 corrects the output power supplied from the power supply coil unit 13 to the power receiving coil unit 21 of the power receiving device 20 using the correction factor obtained by referring to the correction table.

Specifically, in the output correction process carried out in step S45, the corrected output is calculated by the formula: power supply output voltage value (V) x correction rate (%).
Next, in step S48, the power supply control unit 15 instructs the DC/AC control unit 14 to supply power from the power supply coil unit 13 to the power receiving coil unit 21 on the power receiving device 20 side with the corrected output calculated in step S47.

As described above, in this embodiment, the non-contact power supply device 10 that communicates with the power receiving device 20 and supplies power to the power receiving device 20 includes the power supply coil unit 13, the wireless communication unit 16, and the power supply control unit 15. The power supply coil unit 13 supplies power to the power receiving device 20. The wireless communication unit 16 communicates with the wireless communication unit 28 on the power receiving device 20 side. When the wireless communication unit 16 starts receiving data transmitted from the power receiving device 20, if the magnitude of the radio wave intensity included in the data is smaller than a predetermined threshold, the power supply control unit 15 performs a correction to increase the output value supplied from the power supply coil unit 13 to the power receiving device 20.

In other words, in the non-contact power supply device 10 of this embodiment, when the radio wave intensity of the data received from the power receiving device 20 by the wireless communication unit 16 is smaller than a predetermined threshold, the power supply control unit 15 adjusts the output of power supplied from the power supply coil unit 13 to the power receiving device 20 to be larger.

For example, if the remaining battery charge on the power receiving device 20 side is nearly zero, if the positional relationship between the non-contact power supply device 10 and the power receiving device 20 is inappropriate, or if there is an influence of external disturbances such as noise, the radio wave intensity included in the data received from the power receiving device 20 may be reduced due to a deteriorated communication environment. In this case, the data transmitted from the power receiving device 20 cannot be received in a stable state, and therefore there is a risk that power cannot be supplied to the power receiving device 20 stably.

In the present non-contact power supply device 10, when the communication environment deteriorates in this way and the radio wave strength of the received data is lower than a predetermined threshold (-40 dBm), the power supply control unit 15 corrects the output value of the power supplied from the power supply coil unit 13 to the power receiving device 20 (power receiving coil unit 21) to be larger.

As a result, even if the communication environment deteriorates due to, for example, an inappropriate positional relationship between the non-contact power supply device 10 and the power receiving device 20, the output to the power receiving device 20 is corrected to be larger, improving the communication environment with the power receiving device 20 and enabling stable power supply.

As a result, the communication state with the power receiving device 20 can be stabilized, and power can be fed in a stable state.
[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

(A)
In the above embodiment, an example has been described in which the power supply control unit 15 compares the average value of the radio wave intensity of 10 reception data with a predetermined threshold value (-40 dBm), and if the average value is smaller than the predetermined threshold value, performs output correction control to increase the output power supplied from the power supply coil unit 13. However, the present invention is not limited to this.

For example, the radio wave intensity compared with a predetermined threshold value when performing output correction control does not have to be an average value for a predetermined number of times, and may be the radio wave intensity for each piece of received data.
However, in this case, even if the communication environment temporarily deteriorates due to external disturbances, etc., it will be determined that a correction of the power output is necessary and a correction process will be carried out, so it is more preferable to carry out output correction control using the average value of the radio wave strength measured multiple times as described above.

(B)
In the above embodiment, an example has been described in which the power supply control unit 15 calculates an average value of the radio wave intensity of 10 pieces of received data and performs output correction control. However, the present invention is not limited to this.

For example, the average value compared to the predetermined threshold is not limited to the average value of 10 received data items, but may be the average value of the radio wave strength of 9 or less received data items, or 11 or more received data items.

(C)
In the above embodiment, the configuration of the contactless power supply system 30 in which power is supplied from a single contactless power supply device 10 to a single power receiving device 20 has been described as an example. However, the present invention is not limited to this.
For example, the present invention may be a contactless power supply system in which a single contactless power supply device supplies power to a plurality of power receiving devices almost simultaneously.

(D)
In the above embodiment, an example has been described in which the power supply control unit 15 compares the radio wave intensity of the data received by the wireless communication unit 16 with a predetermined threshold value to determine whether or not to perform output correction control. However, the present invention is not limited to this.
For example, the wireless communication unit 16 of the contactless power supply device 10 may determine whether or not to perform output correction control using a predetermined threshold value.

(E)
In the above embodiment, a configuration has been described as an example in which the wireless communication unit 16 that communicates with the power receiving device 20 and the power supply control unit 15 that controls power supply from the power supply coil unit 13 are provided separately. However, the present invention is not limited to this.
For example, the present invention may be realized as a single microcomputer having a communication function for communicating with the power receiving device 20 and a power supply control function for controlling power supply from the power supply coil section 13 .

(F)
In the above embodiment, the contactless power supply device 10, the contactless power supply system 30 including the contactless power supply device 10, and the contactless power supply method are described as examples of the present invention. However, the present invention is not limited to this.
For example, the present invention may be realized as a control program that causes a computer to execute the contactless power supply method described in the above embodiment.
This control program may be stored in the storage unit 17 shown in FIG. 1, and can be read by hardware such as a CPU to cause a computer to execute the above-described control method.

(G)
In the above embodiment, an example has been described in which, at the time of startup, the contactless power supply device 10 supplies power at a lower output (low-output power supply) than during normal power supply, and waits for wireless communication to be received from the power receiving device 20 to which the low-output power supply is being supplied. However, the present invention is not limited to this.
For example, the power supply may be performed at substantially the same output as normal from the time of startup, while waiting for wireless communication to be received from the power receiving device 20 to which the power has been supplied.
However, in this case, high-output power supply is always performed even when the power receiving device 20 is not nearby. Therefore, taking into consideration the power consumption, etc., of the non-contact power supply device 10, it is preferable that low-output power supply be performed first at startup, as in the above embodiment.

The non-contact power supply device of the present invention has the effect of stabilizing the communication state with the power receiving device and enabling power supply in a stable state, and is therefore widely applicable to various devices that employ a non-contact power supply method.

10 Non-contact power supply device 11 DC input unit 11a External outlet 12 DC/AC circuit 13 Power supply coil unit 14 DC/AC control unit 15 Power supply control unit 16 Wireless communication unit (first communication unit)
17 Memory unit 20 Power receiving device 21 Power receiving coil unit 22 Rectifier circuit 23 DC/DC circuit 24 DC/DC control unit 25 Battery (load)
26 State detection unit 27 Power reception control unit 28 Wireless communication unit (second communication unit)
30. Non-contact power supply system

Claims (19)

A contactless power supply device that communicates with a power receiving device and supplies power to the power receiving device,
A power supply coil unit that supplies power to the power receiving device;
A first communication unit that communicates with the power receiving device;
a power supply control unit that performs a correction to increase an output value of power supplied from the power supply coil unit to the power receiving device in order to supply sufficient power to cause the power receiving device to function and stabilize communication between the power receiving device and the first communication unit when the first communication unit starts receiving data transmitted from the power receiving device and the strength of a radio wave for communicating the data is smaller than a predetermined threshold value;
Equipped with
When the power supply control unit is activated, the power supply control unit supplies power at a second output that is lower than a first output when supplying power to the power receiving device until communication is received from the power receiving device, and waits for reception of wireless communication from the power receiving device.
Non-contact power supply device. The power supply control unit compares an average value of the intensities of the radio waves of the plurality of data pieces received by the first communication unit with the threshold value, and corrects the output value.
The contactless power supply device according to claim 1 . The device further includes a storage unit for storing a correction table indicating a relationship between a correction factor used for correcting the output value and the intensity of the radio wave.
The contactless power supply device according to claim 1 or 2. The power supply control unit determines the correction factor by referring to the correction table stored in the storage unit.
The non-contact power supply device according to claim 3 . A DC input unit to which power is input from a power source;
a DC/AC circuit for supplying AC power to the power supply coil unit from the DC power input to the DC input unit;
a DC/AC control unit that controls the DC/AC circuit based on a signal received from the power supply control unit;
Further comprising:
The non-contact power supply device according to claim 1 . The power supply control unit corrects the output value by duty control of PWM (Pulse-Width-Modulation).
The contactless power supply device according to claim 1 . the power supply control unit performs an authentication process to determine whether the power receiving device is authenticated as a power supply target based on data received from the power receiving device during power supply at the second output.
The contactless power supply device according to claim 1 . When the power receiving device is not authenticated as a power supply target in the authentication process, the power supply control unit performs a correction process to increase the second output, and performs an authentication process again to determine whether the power receiving device is authenticated as a power supply target based on data received from the power receiving device.
The non-contact power supply device according to claim 7. A non-contact power supply device according to any one of claims 1 to 8,
a power receiving device that communicates with the non-contact power supply device and receives power from the non-contact power supply device;
A non-contact power supply system equipped with the above. The power receiving device includes a power receiving coil unit to which power is supplied from the power supply coil unit, a battery that stores the power supplied to the power receiving coil unit, a second communication unit that communicates with the first communication unit, and a power receiving control unit that controls an output from the power receiving coil unit to the battery.
The contactless power supply system according to claim 9 . The power receiving device further includes a state detection unit that detects power supplied to the power receiving coil unit.
The contactless power supply system according to claim 10. The power receiving control unit controls an output from the power receiving coil unit to the battery based on the amount of power detected by the state detection unit, and notifies the second communication unit.
The contactless power supply system according to claim 11. A contactless power supplying method for performing communication between a contactless power supplying device and a power receiving device and supplying power from the contactless power supplying device to the power receiving device, comprising:
a communication step of transmitting data from a second communication unit of the power receiving device to a first communication unit of the contactless power supply device;
a comparison step of comparing a magnitude of a radio wave intensity for data communication with a predetermined threshold value when the first communication unit starts receiving the data transmitted from the second communication unit;
an output correction step of performing a correction to increase an output value supplied from a power supply coil section of the non-contact power supply device to a power receiving coil section of the power receiving device in order to supply sufficient power to function the power receiving device and stabilize communication between the power receiving device and the first communication unit when the strength of the radio waves for the data communication is smaller than the predetermined threshold as a result of comparing the strength of the radio waves for the data communication with the predetermined threshold;
a low-output power supply step of supplying power at a second output lower than a first output when supplying power to the power receiving device after being started up until receiving communication from the power receiving device, and waiting for reception of wireless communication from the power receiving device;
A non-contact power supply method comprising: In the output correction step, an average value of the intensities of a plurality of radio waves of the plurality of data received by the first communication unit is compared with the threshold value to correct the output value.
The contactless power supply method according to claim 13. In the output correction step, a correction factor used for correcting the output value is obtained by referring to a correction table stored in a storage unit of the non-contact power supply device.
The contactless power supply method according to claim 13 or 14. In the output correction step, the output value is corrected by a duty control of PWM (Pulse-Width-Modulation).
The contactless power supply method according to any one of claims 13 to 15. The power supply control method further includes an authentication step of performing an authentication process to determine whether the power receiving device is authenticated as a power supply target based on data received from the power receiving device during power supply at the second output.
The contactless power supply method according to claim 13. If the power receiving device is not authenticated as a power supply target in the authentication step, a correction process is performed to increase the second output, and an authentication process is performed again to determine whether the power receiving device is authenticated as a power supply target based on the data received from the power receiving device.
The contactless power supply method according to claim 17. A non-contact power supplying program for performing communication between a non-contact power supplying device and a power receiving device and supplying power from the non-contact power supplying device to the power receiving device,
a communication step of transmitting data from a second communication unit of the power receiving device to a first communication unit of the contactless power supply device;
a comparison step of comparing a magnitude of a radio wave intensity for data communication with a predetermined threshold value when the first communication unit starts receiving the data transmitted from the second communication unit;
an output correction step of performing a correction to increase an output value supplied from a power supply coil section of the non-contact power supply device to a power receiving coil section of the power receiving device in order to supply sufficient power to function the power receiving device and stabilize communication between the power receiving device and the first communication unit when the strength of the radio waves for the data communication is smaller than the predetermined threshold as a result of comparing the strength of the radio waves for the data communication with the predetermined threshold;
a low-output power supply step of supplying power at a second output lower than a first output when supplying power to the power receiving device after being started up until receiving communication from the power receiving device, and waiting for reception of wireless communication from the power receiving device;
A non-contact power supplying program that causes a computer to execute a non-contact power supplying method comprising the steps of:

Images