Non-contact power supply system, method for testing power transmission device, power transmission device, and power reception device

Abstract

A non-contact power supply system (10-10c) for testing the performance of a power transmission device (100, 100c) that performs non-contact power supply, the non-contact power supply system comprising: the power transmission device that transmits power (Pi) to a power reception device (200, 200c) by non-contact power supply; and a power receiving device that receives power. The power transmitting device is provided with: a power transmitting coil (110) that transmits power; a power source (130) that outputs power for power transmission to the power transmission coil; and a first control unit (120, 120a, 120b) that controls the power transmission device, the power receiving device includes a power receiving coil (210) that receives power, and the first control unit includes a plurality of modes (M) that control the output, the plurality of modes having a period switching mode (M2) that changes the output at a predetermined first period (C1).

Description

[0001] Reference to Related Applications This application is based on Japanese Patent Application No. 2023-064898 filed on April 12, 2023, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present disclosure relates to a non-contact power supply system, a test method for a power transmission device, a power transmission device, and a power reception device. BACKGROUND

[0003] As shown in Non-Patent Literature 1, EMC tests of fixed non-contact power supply in a continuous power supply state are performed in a case where there is a positional shift in the positions of the power transmission coil and the power reception coil and in a case where there is no positional shift and they are directly opposite each other.

[0004] The state of a vehicle in which non-contact power supply is performed is divided into a parked state and a running state. In a power transmission line configured of a plurality of power transmission coils, running while switching the power transmission coils is performed to perform power supply based on the running state. At this time, the non-contact power supply device can generate noise depending on the switching period due to output fluctuations caused by switching of the power transmission coils.

[0005] Prior Art Documents Non-Patent Literature

Non-Patent Literature 1

[0006] EMC tests for power supply in a parked state are generally performed with a distance of 10 m between an antenna and a test product. That is, a 10 m method wave darkroom is required. Since EMC tests for power supply in a running state require switching of the power transmission coils, switching is performed by moving the power reception coil with respect to the power transmission coil. Therefore, compared to EMC tests for power supply in a parked state, EMC tests for power supply in a running state are performed in a wider wave darkroom. Therefore, compared to EMC tests for power supply in a parked state, EMC tests for power supply in a running state are more expensive in terms of test costs, and thus cannot be easily implemented.

[0007] Further, the operation of the non-contact power supply device due to switching of the power transmission coil sometimes also changes with time variation of the device or the environment. However, in the case where the power transmission coil is laid underground, for example, it is not easy to perform inspection. Therefore, a technique capable of easily testing the switching of the power transmission coil is required.

[0008] The present disclosure can be implemented in the following manner.

[0009] According to the first aspect of the present disclosure, a non-contact power supply system that tests the performance of a power transmission device that performs non-contact power supply is provided. The non-contact power supply system includes: the power transmission device that performs power transmission to a power reception device by non-contact power supply; and the power reception device that performs power reception of the power. The power transmission device has: a power transmission coil that performs the power transmission; a power source that outputs the power for the power transmission to the power transmission coil; and a first control section that controls the power transmission device. The power reception device includes a power reception coil that performs the power reception. The first control section includes a plurality of modes that controls the output, as the plurality of modes, a cycle switching mode that causes the output to change at a predetermined first cycle.

[0010] By adopting such a manner, the power transmission device outputs the power for the power transmission at the predetermined first cycle in the cycle switching mode. In the case where an electric vehicle is taken as an example as the power reception device, for example, the electric vehicle performs power reception while switching the power transmission coil in the middle of traveling. Therefore, the power transmission device outputs the power according to the switching of the power transmission coil. The switching of the power transmission coil is caused by a cycle based on the traveling speed of the electric vehicle. Therefore, the non-contact power supply system is able to test the performance of the power transmission device at the time of the switching of the power transmission coil without causing the electric vehicle to travel, by setting the first cycle of the cycle switching mode to the cycle based on the traveling speed. Therefore, the non-contact power supply system is able to test the switching of the power transmission coil in a stopped state, and thus is able to easily perform the test compared to when traveling.

[0011] According to a second aspect of the present disclosure, there is provided a test method of testing performance of a power transmission device that performs non-contact power transmission. The test method includes: (a) a process of preparing, as the power transmission device that performs power transmission to a power receiving device by the non-contact power transmission, a power transmission coil that performs the power transmission, a power source that outputs the power for the power transmission to the power transmission coil, and a first control section that controls the power transmission device; (b) a process of preparing the power receiving device that includes a power receiving coil that receives the power for the test; (c) a process of preparing a test device that measures the performance; (d) a process of arranging the power transmission coil and the power receiving coil at predetermined relative positions at which the power transmission coil and the power receiving coil do not face each other when the power transmission coil and the power receiving coil are within a range in which non-contact power transmission is possible; and (e) a process of outputting the power from the power source at a predetermined cycle.

[0012] By adopting such a configuration, the test method of the present disclosure can test the power transmission device according to the electromagnetic coupling state of the power transmission coil and the power receiving coil by changing the relative position of the power receiving coil with respect to the power transmission coil. For example, in the case of an electric vehicle as the power receiving device, the electric vehicle performs power reception while switching the power transmission coil during travel. At this time, since the relative position of the power receiving coil with respect to the power transmission coil changes as the electric vehicle moves, the electromagnetic coupling state changes. Therefore, the test method of the present disclosure can test the power transmission device in a situation closer to actual use by matching the switching position corresponding to the coupling state of the power transmission coil and the power receiving coil in actual non-contact power transmission. In addition, the test method of the present disclosure can easily test the switching of the power transmission coil in a stopped state compared to a traveling state by outputting the output of the power source at a cycle corresponding to the switching of the power transmission coil.

[0013] According to a third aspect of the present disclosure, there is provided a power transmission device that tests performance of non-contact power transmission in a non-contact power transmission system. The non-contact power transmission system includes: a power transmission device that performs power transmission to a power receiving device by the non-contact power transmission; and the power receiving device that performs power reception of the power. The power transmission device includes: a power transmission coil that performs the power transmission; a power source that outputs the power for the power transmission to the power transmission coil; and a first control section that controls the power transmission device. The power receiving device includes a power receiving coil that performs the power reception. The first control section includes a plurality of modes that control the output, and includes a cycle switching mode that changes the output at a predetermined first cycle as one of the plurality of modes.

[0014] By adopting such a manner, the power transmitting device outputs the electric power for power transmission in a predetermined first period in the cycle switching mode. For example, in a case where an electric vehicle is exemplified as the power receiving device, the electric vehicle receives power while switching the power transmitting coil in traveling. Therefore, the power transmitting device outputs the electric power according to the switching of the power transmitting coil. The switching of the power transmitting coil is generated based on a cycle of a traveling speed of the electric vehicle. Therefore, the non-contact power feeding system is able to test the performance of the power transmitting device at the time of switching of the power transmitting coil without causing the electric vehicle to travel, by setting the first period of the cycle switching mode to the cycle based on the traveling speed. Therefore, the non-contact power feeding system is able to test the switching of the power transmitting coil in a stopped state, and thus is able to easily perform the test as compared with performing in a traveling state.

[0015] According to a fourth aspect of the present disclosure, there is provided a power receiving device of a non-contact power feeding system that tests the performance of a power transmitting device that performs non-contact power feeding. The non-contact power feeding system includes the power transmitting device that performs power transmission of electric power to the power receiving device by the non-contact power feeding, and the power receiving device that performs power reception of the electric power. The power transmitting device includes a power transmitting coil that performs the power transmission, a power source that outputs the electric power for the power transmission to the power transmitting coil, and a first control section that controls the power transmitting device. The power receiving device includes a power receiving coil that performs the power reception. The first control section includes a plurality of modes that control the output, and has a cycle switching mode that causes the output to change in a predetermined first period.

[0016] By adopting such a manner, the power transmitting device outputs the electric power for power transmission in a predetermined first period in the cycle switching mode. For example, in a case where an electric vehicle is exemplified as the power receiving device, the electric vehicle receives power while switching the power transmitting coil in traveling. Therefore, the power transmitting device outputs the electric power according to the switching of the power transmitting coil. The switching of the power transmitting coil is generated based on a cycle of a traveling speed of the electric vehicle. Therefore, the non-contact power feeding system is able to test the performance of the power transmitting device at the time of switching of the power transmitting coil without causing the electric vehicle to travel, by setting the first period of the cycle switching mode to the cycle based on the traveling speed. Therefore, the non-contact power feeding system is able to test the switching of the power transmitting coil in a stopped state, and thus is able to easily perform the test as compared with performing in a traveling state. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above objects, other objects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a diagram illustrating a schematic configuration of a non-contact power feeding system according to a first embodiment.

[0019] Figure 2 is an explanatory diagram showing a functional structure of the first control section.

[0020] Figure 3 is an explanatory diagram showing switching of the power transmission coil.

[0021] Figure 4 is an explanatory diagram showing a waveform of an output current at the normal mode of the power supply.

[0022] Figure 5 is an explanatory diagram showing a waveform of an output current at the periodic switching mode of the power supply.

[0023] Figure 6 is a flowchart showing a test procedure of the non-contact power feeding system.

[0024] Figure 7 is an explanatory diagram showing a functional structure of the first control section of the second embodiment.

[0025] Figure 8 is an explanatory diagram showing a functional structure of the first control section of the third embodiment.

[0026] Figure 9 is an explanatory diagram showing a waveform of an output current at the efficiency variable mode of the power supply.

[0027] Figure 10 is an explanatory diagram showing a schematic structure of the non-contact power feeding system of the fourth embodiment.

[0028] Figure 11 is an explanatory diagram showing relative positions of the power transmission coil and the power reception coil. DETAILED DESCRIPTION

[0029] A. First Embodiment: A1. Structure of Non-Contact Power Feeding System: Figure 1 The non-contact power feeding system 10 shown tests the performance of the power transmission device 100 that performs non-contact power feeding. More specifically, the non-contact power feeding system 10 tests the performance of the power transmission device 100 at the time of switching of the power transmission coil 110. For example, the test of the performance of the power transmission device 100 refers to an EMC test or a power feeding efficiency of non-contact power feeding, and the like. The non-contact power feeding system 10 includes the power transmission device 100, the power reception device 200, and the test device 300.

[0030] The power transmission device 100 performs power transmission to the power receiving device 200 by non-contact power feeding. More specifically, the power transmission device 100 includes a power transmission coil 110 that supplies electric power to the power receiving device 200 including a power receiving coil 210 in a non-contact manner. The power transmission coil 110 and the power receiving coil 210 perform transmission of electric power in a non-contact manner by magnetic field resonance coupling. The power transmission device 100 is, for example, a charging station that supplies electric power to an electric vehicle EV having the power receiving coil 210 in a non-contact manner from the laid power transmission coil 110. The power transmission device 100 includes the power transmission coil 110, a first control section 120, a power source 130, and an input section 140.

[0031] The power source 130 outputs electric power for power transmission to the power transmission coil 110. The power source 130 is constituted by a commercial AC power source 131, a rectifier circuit 132, and an inverter 133. The commercial AC power source 131 is electrically connected to the rectifier circuit 132. The rectifier circuit 132 is electrically connected to the inverter 133. The commercial AC power source 131 outputs commercial frequency AC electric power Pg to the rectifier circuit 132. The rectifier circuit 132 converts the received commercial frequency AC electric power Pg to direct current electric power.

[0032] The inverter 133 converts the direct current electric power output from the rectifier circuit 132 to AC electric power Pi of a frequency required for power transmission of the power transmission coil 110. More specifically, the inverter 133 outputs AC electric power Pi based on a resonance frequency of the power transmission coil 110 and the power receiving coil 210 described later. The inverter 133 is, for example, a full-bridge inverter constituted by four switching elements Q1 to Q4 connected in a full-bridge configuration. In Figure 1 In order to easily understand the input and output of the inverter 133, the rectifier circuit 132 and the power transmission coil 110 connected to the inverter 133 are illustrated as input and output lines of the circuit.

[0033] In the inverter 133, the switching elements Q1 to Q4 are controlled in on and off states by switching control signals supplied from the first control section 120. By alternately making the pair of the switching element Q1 and the switching element Q4 and the pair of the switching element Q2 and the switching element Q3 into the on state, AC electric power Pi is supplied to the power transmission coil 110 connected to the middle point MP1 and the middle point MP2 of each pair as electric power for power transmission. The frequency of the AC electric power Pi is also referred to as a power supply frequency Fp. That is, the power supply frequency Fp is the operation frequency of the switching elements Q1 to Q4 for the AC electric power Pi. In addition, in the present embodiment, a state in which the power supply frequency Fp and the resonance frequency substantially coincide is described. Further, the output of the inverter 133 and the output of the power source 130 are regarded as the same meaning.

[0034] The power transmission coil 110 performs power transmission to the power receiving device 200. More specifically, the power transmission coil 110 is a resonance circuit including a capacitor. The power transmission coil 110 is, for example, designed so that the resonance frequency is 85 kHz in a state of electromagnetic coupling with the power receiving coil 210. The power transmission coil 110 receives an alternating-current power Pi of 85 kHz from the inverter 133 by being connected to the inverter 133. The power transmission coil 110 generates an alternating-current magnetic field by the alternating-current power Pi received from the inverter 133. Thus, the power receiving coil 210 receives power by resonating with the alternating-current magnetic field received from the power transmission coil 110. The configuration of the power transmission coil 110 is described later. In addition, there is a case where a filter for noise suppression is inserted between the inverter 133 and the power transmission coil 110.

[0035] Further, the resonance circuit of the power transmission coil 110 is a series resonance circuit. Thus, for example, in a case where an alternating-current voltage of a rectangular wave of 85 kHz is output from the inverter 133, an alternating-current current of a sine wave of 85 kHz is output as the resonance circuit of the power transmission coil 110. Thus, in the drawings described later, the output current of the power source 130 as the power for power transmission is illustrated as a sine wave. In addition, as a form of resonance, various resonance modes such as a parallel resonance can be applied.

[0036] Figure 2 The first control section 120 controls the power transmission device 100. More specifically, the first control section 120 controls the power transmission of the power transmission device 100 by controlling the switching elements Q1 to Q4 of the inverter 133.

[0037] The first control section 120 includes a processor 121, a ROM 122, and a RAM 123. The ROM 122 is a read-only semiconductor memory, and stores a control program for controlling the inverter 133 in advance.

[0038] The ROM 122 includes a normal mode M1 and a cycle switching mode M2 as the control mode M of the power source 130. Each mode is described in detail later.

[0039] The RAM 123 includes a main memory as a semiconductor memory and a hard disk or a solid state drive or the like as an auxiliary storage device. The RAM 123 stores information required for controlling the power source 130. More specifically, the RAM 123 stores cycle information C and mode information S of the control mode M as parameters of the control mode M of the power source 130. These information is described later.

[0040] The processor 121 realizes the functions of the respective sections by implementing various programs stored in the ROM 122. The processor 121 uses the RAM 123 to store information required for processing. The specific functions of the processor 121 are described in detail later.

[0041] The first control section 120 is connected to the switching elements Q1 to Q4 of the inverter 133 via a drive circuit. The drive circuit outputs switching control signals for driving the switching elements Q1 to Q4 in accordance with control signals from the first control section 120. In order to easily understand the technology, the illustration of the drive circuit is omitted in Figure 1

[0042] The input section 140 inputs information for controlling the power supply 130. More specifically, the input section 140 inputs at least the period information C by an operation from the outside. The input section 140 is, for example, a switch. The switch is electrically connected to the first control section 120. The switch changes the period information C and the mode information S by inputting a signal to the first control section 120 by a switching operation.

[0043] The test device 300 tests the performance of the power transmission device 100. The test device 300 is, for example, an EMC tester or a wattmeter. The test device 300 as the EMC tester tests the EMC at the time of switching of the power transmission coil 110 by the EMC tester. The test device 300 as the wattmeter measures the power supply efficiency of power at the time of non-contact power supply by being connected to the power supply 130 and the load 230.

[0044] The power receiving device 200 receives power. More specifically, the power receiving device 200 is a standard device that receives power for the test of the power transmission device 100. The power receiving device 200 includes a power receiving coil 210, a rectifier circuit 220, and a load 230.

[0045] The power receiving coil 210 receives power from the power transmission coil 110. More specifically, the power receiving coil 210 includes a capacitor and constitutes a resonance circuit. The power receiving coil 210 is, for example, a resonance circuit designed so that the resonance frequency is 85 kHz in a state of being electromagnetically coupled to the power transmission coil 110. The power receiving coil 210 receives an alternating-current magnetic field from the power transmission coil 110. The power receiving coil 210 is connected to the rectifier circuit 220. Therefore, the power receiving coil 210 outputs alternating-current power generated by an induced electromotive force generated by resonance with the alternating-current magnetic field to the rectifier circuit 220.

[0046] The power receiving coil 210 is arranged in an orientation that faces the power transmission coil 110. In addition, the power receiving coil 210 is located in a range Lon in which power supply is possible with the power transmission coil 110. For example, as illustrated in FIG. 1, the power receiving coil 210 is arranged in a range Lon in which power supply is possible with the power transmission coil 110. Figure 3 ​The case where the electric vehicle EV including the power receiving coil 210 travels on the road Ro on which the plurality of power transmission coils 110 are laid is shown as an example. The plurality of power transmission coils 110 are in a state of being arranged at equal intervals along the advancing direction Am10 of the electric vehicle EV as an arrow Am10.

[0047] There are a range in which the power transmission coil 110 can supply power to the power receiving coil 210 and a range in which the power transmission coil 110 cannot supply power on the road Ro on which the plurality of power transmission coils 110 are laid. In addition, the determination of the ability to supply power and the inability to supply power is made on the basis of the electromagnetic coupling state of the power transmission coil 110 and the power receiving coil 210. In the case where the range in which power can be supplied is set as a length Lon and the range in which power cannot be supplied is set as a length Loff with respect to the length in the direction parallel to the advancing direction Am10, the power receiving coil 210 is located in the range Lon in which power can be supplied. In the following description, the sum of the length Lon and the length Loff is referred to as an interval L as the interval of the supply of power to the electric vehicle EV in travel. In addition, the length Lon is a length different from the length R1 corresponding to the width of the power transmission coil 110. More specifically, in the case where the range in which the power transmission coil 110 is not present between the adjacent power transmission coils 110 is set as a length R2, each length is in a relationship of the length R1 < the length Lon and the length R2 > the length Loff. These relationships are also the same in each of the power transmission coils arranged at equal intervals. In addition, the relationship of the dimensions based on the Figure 3 is shown here, but there are various modifications in the dimensions according to the coil shape and the like, such as the case where the power receiving coil 210 is longer than the power transmission coil 110 or the case where power is transmitted from the plurality of power transmission coils 110 by one power receiving coil 210.

[0048] The power receiving coil 210 in the case where it is located in the range Lon in which power can be supplied performs power reception by magnetic field resonance coupling to lower the impedance of the resonance circuit. At this time, as the state of the on period Ton of the output, the power supply 130 is in a state of outputting a current for the alternating current power Pi. The power receiving coil 210 in the case where it is located in the range Loff of the power transmission coil 110 in which power cannot be supplied cannot perform power reception because the impedance of the resonance circuit is high. At this time, as the state of the off period Toff of the output, the power supply 130 is in a state of not outputting a current. The on period Ton of the output and the off period Toff of the output are described later. The on period Ton of the output is also referred to as a first period Ton. The off period Toff of the output is also referred to as a second period Toff.

[0049] Figure 1The rectifier circuit 220 shown converts the alternating-current power received from the power receiving coil 210 into direct-current power. The rectifier circuit 220 is electrically connected to the power receiving coil 210 and the load 230. Therefore, the rectifier circuit 220 outputs the converted direct-current power to the load 230.

[0050] The load 230 is a device that uses the received power. More specifically, the load 230 is an electronic load. Since the power receiving device 200 is a standard tester, the load 230 simulates a load possessed by the power receiving device 200 that actually receives power transmission from the power transmitting device 100. The load 230 corresponds to a battery, for example, in the case of an electric vehicle EV.

[0051] A2: Normal mode: The first control section 120 includes a plurality of modes M that control the output of the power supply 130. More specifically, the first control section 120 includes a normal mode Ml and a periodic switching mode M2. Each mode M is a mode M of control of the switching elements Ql to Q4 of the inverter 133. Each mode M is selected by receiving mode information S that selects one mode M of the plurality of modes M by the input section 140.

[0052] The normal mode Ml is a mode M that does not periodically change the output of the power supply 130. More specifically, the switching elements Ql to Q4 at the time of the normal mode Ml are in a state of being driven at a power supply frequency Fp based on the resonance frequency of the power transmitting coil 110 and the power receiving coil 210. That is, the normal mode Ml is not a mode M for testing of the test device 300, but is a mode M of the output of the power supply 130 at the time of actual use of the power transmitting device 100. For example, in a case where the inverter 133 outputs alternating-current power Pi coinciding with the resonance frequency of 85 kHz of the power transmitting coil 110 and the power receiving coil 210, as shown in Figure 4 The normal mode Ml outputs an alternating-current current of a frequency of 85 kHz as the power supply frequency Fp during the output period of the inverter 133. In addition, in Figure 4 The waveform of the output current in a stable state by the power supply 130 at the time of the normal mode Ml is shown.

[0053] A3: Periodic switching mode: The periodic switching mode M2 causes the output of the power supply 130 to change at a predetermined first period. More specifically, the periodic switching mode M2 causes the output of the power supply 130 to change at a switching period of the power transmitting coil 110 at the time of actual use of the power transmitting device 100.

[0054] As shown in Figure 3As shown, the switching of the power supply coil 110 occurs, for example, when an electric vehicle (EV) including the power receiving coil 210 is in motion and receives power from multiple power supply coils 110. The power receiving coil 210 moves from a non-power-supply range of length Loff in the direction of travel Am10 to the next power-supply range. Therefore, the power receiving coil 210 provides non-contact power supply while switching the power supply coils 110. That is, the switching cycle of the power supply coil 110 is the cycle in which the object of the power supply coil 110 that supplies power to the power receiving coil 210 changes. This cycle is referred to as the first cycle C1.

[0055] As described above, the state of the current output from the power supply 130 is changed by positioning the receiving coil 210 within a power supply range or a power non-power supply range. More specifically, as... Figure 5 As shown, the output current of power supply 130 has an on-time period Ton during which the output current is output and an off-time period Toff during which the output current is not output. That is, the first cycle C1 is a period in which the total time of the on-time Ton during which the output current of power supply 130 is executed and the off-time Toff during which the output current of power supply 130 is stopped is considered as one cycle. During the on-time Ton, the receiving coil 210 is located within the range of length Lon, which is within the range where it can supply power to the supply coil 110. During the off-time Toff, the receiving coil 210 is located within the range of length Loff, which is within the range where it cannot supply power to the supply coil 110.

[0056] Therefore, the first cycle C1 of the switching of the power supply coil 110 is determined by the driving speed V of the electric vehicle EV and the interval L of the power supply coil 110. More specifically, the first cycle C1 is calculated as C1 = L / V. For example, when the driving speed V is 100 km / h and the interval L of the power supply coil 110 is 1 m, the first cycle C1 is 0.036 sec. That is, the frequency is approximately 27 Hz.

[0057] Furthermore, when the ratio of the output's on-time Ton in the first cycle C1 to the ratio of the length Lon of the power supply range in the interval L between the transmitting coil 110 and the receiving coil is set as the duty cycle Don, the duty cycle Don is calculated as Don = Lon / (Lon + Loff). Therefore, the output's on-time Ton is calculated as Ton = Don × C1. The output's off-time Toff is calculated as Toff = C1 - Ton.

[0058] The cycle switching mode M2 ​​is generated by controlling inverter 133. Figure 5the state of the current shown. More specifically, the periodic switching mode M2 makes all of the switching elements Q1 to Q4 of the inverter 133 into the off state during the output off period Toff. The periodic switching mode M2 makes the pairs of the switching elements Q1 and Q4 and the switching elements Q2 and Q3 alternately act in the on state and the off state during the output on period Ton by the power supply frequency Fp based on the resonance frequency of the power transmission coil 110 and the power reception coil 210. That is, the periodic switching mode M2 stops the output of the inverter 133 as the output off period Toff by the first period C1 longer than the period of the power supply frequency Fp.

[0059] In addition, the output off period Toff is a period different from the dead time in which the switching elements Q1 to Q4 are made into the off state in order to prevent the through current of the pairs of the switching elements Q1 and Q4 and the switching elements Q2 and Q3.

[0060] In the periodic switching mode M2, as described above, the first period C1 and the output on period Ton and the output off period Toff of the output as the period information C are determined by the conditions at the time of actual use of the power transmission device 100. The period information C is set by the input section 140 by operation.

[0061] Therefore, the periodic switching mode M2 can simulate the switching of the power transmission coil 110 by controlling the output of the power supply 130 using the first period C1 having the output off period Toff. In addition, in order to easily understand the technology, in Figure 5 In the periodic switching mode M2, as described above, the first period C1 and the output on period Ton and the output off period Toff of the output as the period information C are determined by the conditions at the time of actual use of the power transmission device 100. The period information C is set by the input section 140 by operation.

[0062] A4: Test method: Figure 6 is a flowchart showing the procedure of the test performed by the non-contact power supply system 10. The non-contact power supply system 10 performs a test on the performance of the power transmission device 100 according to Figure 6 The flow shown in the test procedure is performed on the performance of the power transmission device 100.

[0063] In step S110 of the test procedure, Figure 6 In step S110 of the test procedure,

[0064] In step S110 of the test procedure, Figure 6In step S120, the operator prepares the power receiving device 200 including the power receiving coil 210 for performing power reception for the purpose of test. More specifically, the operator prepares the power receiving device 200 including the power receiving coil 210, the rectifier circuit 220, and the load 230 as a standard tester.

[0065] In Figure 6 In step S130, the operator prepares the test device 300 for measuring the performance of the power transmitting device 100. That is, in the case of EMC test, the operator performs preparation for arranging the power transmitting device 100 or the power receiving device 200 in an antenna or a wave darkroom for EMC measurement. In the case of measuring the power supply efficiency of non-contact power supply, the operator performs preparation for connecting the electric energy meter to the power transmitting device 100 and the power receiving device 200, respectively.

[0066] In Figure 6 In step S140, the operator sets the control mode M of the power supply 130 to the periodic switching mode M2. More specifically, the operator sets to the periodic switching mode M2 in accordance with the instruction of the mode information S by the operation of the input section 140. In addition, at this time, the operator also sets the periodic information C through the input section 140.

[0067] In Figure 6 In step S150, after selecting the control mode M of the power supply 130, the operator decides the relative position of the power transmitting coil 110 and the power receiving coil 210. That is, the power receiving coil 210 is arranged within the range in which power can be supplied.

[0068] In Figure 6 In step S160, the operator performs output of electric power for power transmission at the first period determined in advance by the power transmitting device 100. That is, the operator starts non-contact power supply by the power supply 130 set to the periodic switching mode M2.

[0069] In Figure 6 In step S170, the operator performs test. For example, the operator performs EMC test of the non-contact power supply system 10 or measurement of the power supply efficiency of non-contact power supply by the test device 300.

[0070] Thus, by adopting such a manner, the power transmitting device 100 outputs the electric power for power transmission in the periodic switching mode M2 with the predetermined first period. For example, in a case where the electric vehicle EV is exemplified as the power receiving device 200, the electric vehicle EV receives the electric power while switching the power transmitting coil 110 in the running. Thus, the power transmitting device 100 outputs the electric power in accordance with the switching of the power transmitting coil 110. The switching of the power transmitting coil 110 is generated based on the period of the running speed V of the electric vehicle EV. Thus, the non-contact power feeding system 10 is able to test the performance of the power transmitting device 100 at the time of the switching of the power transmitting coil 110 without causing the electric vehicle EV to run, by setting the first period Cl of the periodic switching mode M2 to the period based on the running speed V. Thus, the non-contact power feeding system 10 is able to test the switching of the power transmitting coil 110 in the stopped state, and thus, is able to easily test compared to in the running state.

[0071] Further, the power transmitting device 100 is able to switch between the normal mode Ml and the periodic switching mode M2. Thus, the non-contact power feeding system 10 is able to cause the power transmitting device 100 to operate in the normal mode Ml at the time of use, and to cause the power transmitting device 100 to operate in the periodic switching mode M2 only at the time of test. Thus, the non-contact power feeding system 10 is able to easily test the actually used power transmitting device 100 without rewriting the control contents for the test.

[0072] Further, the power receiving device 200 is a standard for test, and thus, comparison becomes easy in a case where a plurality of tests are performed on the power transmitting device 100.

[0073] B. Second Embodiment: In the non-contact power feeding system 10a of the second embodiment, as shown in Figure 7 the plurality of modes M that control the output of the power source 130 further includes an on-off switching mode M3 in which the on period Ton of the output and the off period Toff of the output are different. The on-off switching mode M3 controls the output of the power source 130 based on the information of the first period Cl. The on-off switching mode M3 is stored in the ROM 122 of the first control section 120a. The other structures of the non-contact power feeding system 10a of the second embodiment are the same as those of the non-contact power feeding system 10 of the first embodiment.

[0074] In the on-off switching mode M3, the on period Ton of the output is different from the off period Toff of the output. That is, the on-off switching mode M3 is a state in which the duty ratio Don is other than 0.5. The cycle information C is information including the on period Ton of the output and the off period Toff of the output. Therefore, in the on-off switching mode M3, the on period Ton of the output and the off period Toff of the output are set by the input section 140. That is, the on-off switching mode M3 can change the duty ratio Don.

[0075] By adopting such a manner, it is possible to perform a test according to the ratio of the actual power supply range to the non-power supply range.

[0076] C. Third Embodiment: In the non-contact power supply system 10b of the third embodiment, as shown in Figure 8 the output of the power supply 130 further includes an efficiency variable mode M4. The efficiency variable mode M4 is stored in the ROM 122 of the first control section 120b. Also, the input section 140 of the third embodiment can input information of a second cycle C2. The second cycle C2 is a cycle of the power supply frequency Fp of the alternating current power Pi. The second cycle C2 is stored in the RAM 123. The other structures of the non-contact power supply system 10b of the third embodiment are the same as those of the non-contact power supply system 10a of the second embodiment.

[0077] The efficiency variable mode M4 varies the second cycle C2 in the on period Ton of the output. More specifically, in the efficiency variable mode M4, the second cycle C2 is varied in a manner that gradually becomes longer from the start of the on period Ton of the output. For example, as shown in Figure 9 the efficiency variable mode M4 varies the second cycle C2 into three stages of a cycle Ca to a cycle Cc. For example, the cycle Ca to the cycle Cc are, in order, a cycle 11.1 nsec, a cycle 11.8 nsec, and a cycle 12.7 nsec, and are, as frequencies, a frequency 90 kHz, a frequency 85 kHz, and a frequency 79 kHz.

[0078] In the efficiency variable mode M4, the information of the second cycle C2 is input by an operation from the input section 140. The efficiency variable mode M4 varies the second cycle C2 in a range of a cycle shorter than the first cycle Cl. Therefore, for example, as in the example described above, in a case where the first cycle Cl is 0.036 sec, the second cycle C2 is a cycle shorter than 0.036 sec.

[0079] By adopting such a manner, it is possible to perform a test simulating a case where the power supply frequency Fp is changed according to the relative positions of the overhead coil and the vehicle coil as the power transmission coil 110 and the power reception coil 210, for example.

[0080] D. Fourth Embodiment: In Figure 10 In the non-contact power feeding system 10c of the fourth embodiment shown in FIG. 10, the power receiving device 200c includes a power receiving communication section 240 that transmits mode information S that selects one of the plurality of modes M to the power feeding device 100c. Further, the power feeding device 100c includes a power feeding communication section 150 that communicates the mode information S with the power receiving communication section 240 of the power receiving device 200c. The other structure of the non-contact power feeding system 10c of the fourth embodiment is the same as that of the non-contact power feeding system 10b of the third embodiment.

[0081] The power feeding communication section 150 communicates information related to the control of the inverter 133 with the power receiving communication section 240 of the power receiving device 200c. That is, the power feeding communication section 150 communicates the mode information S that selects the mode M. For example, the power feeding communication section 150 is a hardware module that can communicate by Bluetooth ("bluetooth" registered trademark). The power feeding communication section 150 is connected to the first control section 120 through a communication line.

[0082] The power receiving communication section 240 communicates with the power feeding communication section 150 of the power feeding device 100c. The power receiving communication section 240 is a hardware module that can wirelessly communicate by Bluetooth ("bluetooth" registered trademark). The power receiving communication section 240 also includes a second input section. The power receiving communication section 240 transmits the mode information S that selects the mode M input from the second input section to the power feeding communication section 150 through wireless communication.

[0083] By adopting such a manner, the non-contact power feeding system 10 can start the test of the power feeding device 100 according to the instruction from the power receiving device 200. For example, even in a state where the power feeding device 100 is laid, the non-contact power feeding system 10 can easily test the power feeding device 100 from the power receiving device 200.

[0084] E. Fifth Embodiment: In the non-contact power feeding system 10 of the fifth embodiment, the power feeding coil 110 and the power receiving coil 210 are disposed at predetermined relative positions that are not directly opposite each other.

[0085] In Figure 11 In the non-contact power feeding system 10 of the fifth embodiment, the power feeding coil 110 and the power receiving coil 210 are disposed at predetermined relative positions that are not directly opposite each other. Figure 11In the present embodiment, as the position of the power receiving coil 210, an arbitrary position Pl within the power supplyable range of the length Lon, an arbitrary position P3 within the non-power supplyable range of the length Loff, and an arbitrary position P2 across the ranges of the length Lon and the length Loff are shown. The non-contact power feeding system 10 of the fifth embodiment performs the test of the above-described embodiments in a state where the power receiving coil 210 is disposed at any one of the position Pl to the position P3. In addition, the position P2 and the position P3 are relative positions where the power feeding coil 110 and the power receiving coil 210 are not aligned. That is, in the non-contact power feeding system 10 of the fifth embodiment, the power feeding coil 110 and the power receiving coil 210 are also disposed at relative positions where they are not aligned with each other.

[0086] For example, in the case of the electric vehicle EV that is an example of actual use of the power feeding device 100, the power receiving coil 210 performs non-contact power feeding while transitioning to the state of the position Pl to the position P3. The electromagnetic coupling state of the power feeding coil 110 and the power receiving coil 210 differs at each of the position Pl to the position P3. That is, at each of the position Pl to the position P3, the state of the power feeding efficiency and the EMC differs.

[0087] The position P2 is a position where the power supplyable range is shifted to the non-power supplyable range, and is a position where the switching of the power receiving coil 210 is started. Therefore, by disposing the power receiving coil 210 at the position P2, it is possible to make the conditions of the relative positions of the power feeding coil 110 and the power receiving coil 210 close to the switching conditions of the power feeding coil 110 of the power feeding device 100 when it is actually used.

[0088] Further, by performing the test of the above-described embodiments at each of the position Pl to the position P3, it is possible to perform the test in a state closer to the electromagnetic coupling of the power feeding coil 110 and the power receiving coil 210 of the power feeding device 100 when it is actually used.

[0089] In addition, as the test method, in the flowchart of Figure 6 the procedure of step S150, the determination of the relative positions of the power feeding coil 110 and the power receiving coil 210 is performed.

[0090] By employing such a manner, the test method of the non-contact power feeding system 10 of the fifth embodiment is able to perform the test of the power feeding device 100 according to the electromagnetic coupling state of the power feeding coil 110 and the power receiving coil 210 by changing the relative position of the power receiving coil 210 with respect to the power feeding coil 110. For example, in the case of taking the electric vehicle EV as an example as the power receiving device 200, the electric vehicle EV performs power receiving while switching the power feeding coil 110 in the middle of traveling. At this time, since the relative position of the power receiving coil 210 with respect to the power feeding coil 110 changes with the movement of the electric vehicle EV, the electromagnetic coupling state changes. Therefore, the test method of the present disclosure is able to perform the test of the power feeding device 100 in a situation closer to the actual use by matching the switching position corresponding to the coupling state of the power feeding coil 110 and the power receiving coil 210 in the actual non-contact power feeding. Further, the test method of the present disclosure is able to easily perform the test of the switching of the power feeding coil 110 in the stopped state compared to the traveling state, for example, by outputting the output of the power source 130 with a period corresponding to the switching of the power feeding coil 110.

[0091] F. Modification (1) In the above-described embodiment, the input section 140 can also input the device from the outside in a manner other than a switch. As long as it is a manner capable of transmitting the information necessary for the control of the power source 130 to the first control section 120. For example, it is also possible to input the period information C, the mode information S, and the like by the operation of the keyboard of a general-purpose computer capable of connecting to the first control section 120.

[0092] (2) In the above-described embodiment, the power receiving device 200 is a standard device that performs power receiving for the test of the power feeding device 100. However, the power receiving device 200 can also not be a standard device, but a power receiving device 200 that performs power receiving at the time of the actual use of the power feeding device 100. For example, in the case of performing the test of the power feeding device 100 as a charging station for the electric vehicle EV, it is also possible to use the electric vehicle EV as the power receiving device 200.

[0093] (3) In the above-described embodiment, the power supplyable range and the power non-supplyable range are judged according to the electromagnetic coupling state of the power feeding coil 110 and the power receiving coil 210, but it is also possible to judge by other methods. For example, these ranges can also be judged according to the range based on the outer diameter of the power feeding coil.

[0094] (4) In the above-described embodiment, the first control section 120 includes the normal mode Ml and the period switching mode M2 in advance. However, the first control section 120 can also be a manner including only the period switching mode M2. That is, for the test, the first control section 120 can also be a state in which only the period switching mode M2 is written.

[0095] (5) In the above embodiment, the plurality of modes M that control the output of the power supply 130 are stored in the ROM 122. However, the plurality of modes M that control the output of the power supply 130 can also be stored in the RAM 123.

[0096] (6) In the above embodiment, the power supply 130 controls the output of the power supply 130 by the inverter 133. However, the power supply 130 can also control the output by other structures. For example, the power supply 130 can also control the output by including a linear amplifier.

[0097] (7) In the above embodiment, the power transmission device 100 includes the input section 140. However, the power transmission device 100 can also not include the input section 140. For example, the first control section 120 can also be a manner that stores the cycle information C in advance and does not need the input from the input section 140.

[0098] (8) In the above embodiment, the input section 140 inputs the cycle information C and the mode information S. However, the input section 140 can also input only the cycle information C.

[0099] (9) In the above embodiment, the cycle information C includes the first cycle Cl, the on period Ton of the output, and the off period Toff of the output. However, the cycle information C can also be a manner that contains a part of the information or a manner that contains other information. For example, the cycle information C can also be a manner that has only the first cycle Cl and the on period Ton of the output, or a manner that has the first cycle Cl and the duty ratio Don.

[0100] (10) In the above embodiment, the second cycle C2 is a cycle shorter than the first cycle Cl. However, the second cycle C2 can also be a cycle range based on the resonance frequency. For example, in the case where the resonance frequency is 85 kHz, the second cycle C2 can also be a range of frequencies 79 kHz to 90 kHz that contains the frequency 85 kHz, that is, a range of cycles 11 nsec to 13 nsec.

[0101] (11) In the above embodiment, the communication of the power transmission device 100c and the power receiving device 200c is performed by the power receiving communication section 240 and the power transmission communication section 150. However, the power transmission device 100c and the power receiving device 200c can also not include the power receiving communication section 240 and the power transmission communication section 150. It can also be a manner that the power transmission device 100 and the power receiving device 200 are connected by a wired connection. That is, the power receiving device 200 can also be a manner that communicates information to the power transmission device 100 by wired communication by including an input section that can input information for controlling the output of the power supply 130.

[0102] (12) In the above embodiment, as described above, Figure 9As shown, the efficiency-variable mode M4 changes the second period C2 in such a manner that the start of the on period Ton of the output gradually becomes longer. However, the efficiency-variable mode M4 is not limited to three stages, and can change the second period C2 in a plurality of stages of two or more stages. The efficiency-variable mode M4 can also change the second period C2 in such a manner that the start of the on period Ton of the output gradually becomes shorter.

[0103] (13) In the above-described embodiment, the power feeding communication section 150 and the power receiving communication section 240 perform wireless communication by Bluetooth ("bluetooth" registered trademark). However, the power feeding communication section 150 and the power receiving communication section 240 can perform wireless communication by IrDA (registered trademark), Zigbee (registered trademark), or wireless LAN such as Wi-Fi (registered trademark).

[0104] (14) In the above-described embodiment, the on period Ton of the output, the off period Toff of the output, and the first period Cl are controlled by the inverter 133. However, these can be controlled by a device other than the inverter 133. For example, the power supply 130 can control the power input to the inverter 133 by providing a relay between the rectifier circuit 132 and the inverter 133. That is, the power supply 130 can control the on period Ton of the output, the off period Toff of the output, and the first period Cl by controlling the relay.

[0105] (15) In the above-described embodiment, the test device 300 is a test device for testing EMC or power feeding efficiency. However, the test device 300 can also be another test device. For example, the test device 300 can also be an oscilloscope for confirming the operation of the circuit of the power supply 130, a thermal imaging camera for measuring the temperature rise of a component, or the like. In addition, the values of the current or voltage measured in the power feeding device 100 or the power receiving device 200 can also be accepted and used.

[0106] (16) In the above-described embodiment, the power feeding device 100 includes one power feeding coil 110, and the power receiving device 200 includes one power receiving coil 210. However, the power feeding device 100 can include one or more power feeding coils 110. In addition, the power receiving device 200 can include one or more power receiving coils 210.

[0107] (17) In the above-described embodiment, the power receiving communication section 240 inputs the mode information S by including the second input section. However, the power receiving communication section 240 can also not include the second input section. The power receiving communication section 240 can also be a mode in which the power receiving communication section 240 does not need the input of the second input section, and transmits the mode information S stored in advance to the power feeding communication section 150.

[0108] The present disclosure is not limited to the above-described embodiments and modifications, and can be implemented by various structures within a range not departing from the gist described above. For example, the technical features in the embodiments and modifications corresponding to the technical features in each of the modes described in the summary of the application can be appropriately replaced or combined to solve part or all of the above-described technical problems or achieve part or all of the above-described effects. In addition, the above-described technical features can be appropriately deleted as long as they are not described as essential structures in the present specification.

[0109] Other modes: Features of the present disclosure are as shown below.

[0110] (Mode 1) A non-contact power feeding system tests performance of a power feeding device (100, 100c) that performs non-contact power feeding, the non-contact power feeding system (10 to 10c) including: the power feeding device that performs power (Pi) feeding of electric power to a power receiving device (200, 200c) by the non-contact power feeding; and the power receiving device that receives the electric power, the power feeding device includes: a power feeding coil (110) that performs the power feeding; a power supply (130) that outputs the electric power for the power feeding to the power feeding coil; and a first control section (120, 120a, 120b) that controls the power feeding device, the power receiving device includes a power receiving coil (210) that performs the power receiving, and the first control section includes a plurality of modes (M) that are modes of controlling the output, the plurality of modes including a cycle switching mode (M2) that causes the output to change at a predetermined first cycle (C1).

[0111] (Mode 2) In the non-contact power feeding system described in Mode 1, wherein the plurality of modes further include a normal mode (M1) that causes the output to change aperiodically.

[0112] (Mode 3) In the non-contact power feeding system described in Mode 2, wherein the power feeding device includes an input section (140) that inputs at least information of the first cycle from an operation from the outside.

[0113] (Mode 4) In the non-contact power feeding system described in Mode 3, wherein The first period is a period in which a sum of a first period (Ton) in which the output is performed and a second period (Toff) in which the output is stopped is set as one cycle, The plurality of modes further includes an on-off switching mode (M3) in which the first period and the second period are different, The on-off switching mode controls the output based on information of the first period.

[0114] (Mode 5) In the non-contact power feeding system described in Mode 4, wherein The power is alternating current power of a second period (C2) shorter than the first period, The input section is capable of inputting information of the second period, The plurality of modes includes an efficiency variable mode (M4) in which the second period in the first period is changed.

[0115] (Mode 6) In the non-contact power feeding system described in any one of Modes 2 to 5, wherein The power receiving device includes a power receiving communication section (240) that transmits mode information of selecting one mode of the plurality of modes to the power feeding device, The power feeding device includes a power feeding communication section (150) that communicates the mode information with the power receiving communication section of the power receiving device, The first control section performs one mode of the plurality of modes based on the mode information.

[0116] (Mode 7) A test method of testing a performance of a power feeding device that performs non-contact power feeding, the test method including: (a) a process of preparing a power feeding coil that performs power feeding to a power receiving device by the non-contact power feeding, a power source that outputs power (Pi) for the power feeding to the power feeding coil, and a first control section that controls the power feeding device; (b) a process of preparing the power receiving device including a power receiving coil that receives the power for the test; (c) a process of preparing a test device that measures the performance; (d) a process of disposing the power feeding coil and the power receiving coil at predetermined relative positions not facing each other when the power feeding coil and the power receiving coil are within a range in which the non-contact power feeding is possible; and (e) a process of performing the output at a predetermined period.

[0117] (Mode 8) In the non-contact power feeding system described in Mode 1, The power receiving device is a standard for the above-described test.

[0118] (Mode 9) A power feeding device that tests the performance of non-contact power feeding in a non-contact power feeding system, The non-contact power feeding system includes: The power feeding device that feeds power to the power receiving device through the non-contact power feeding; and The power receiving device that receives the power, The power feeding device includes: A power feeding coil that performs the power feeding; A power source that outputs the power for the power feeding to the power feeding coil; and A first control section that controls the power feeding device, The power receiving device includes a power receiving coil that performs the power receiving, The first control section includes a plurality of modes that are modes of controlling the output, the plurality of modes having a cycle switching mode that causes the output to change at a predetermined first cycle.

[0119] (Mode 10) A power receiving device that is a power receiving device of a non-contact power feeding system that tests the performance of a power feeding device that performs non-contact power feeding, The non-contact power feeding system includes: The power feeding device that feeds power to the power receiving device through the non-contact power feeding; and The power receiving device that receives the power, The power feeding device includes: A power feeding coil that performs the power feeding; A power source that outputs the power for the power feeding to the power feeding coil; and A first control section that controls the power feeding device, The power receiving device includes a power receiving coil that performs the power receiving, The first control section includes a plurality of modes that are modes of controlling the output, the plurality of modes having a cycle switching mode that causes the output to change at a predetermined first cycle.

Claims

1. A non-contact power supply system which tests performance of a power transmission device (100, 100c) that performs non-contact power transmission, the non-contact power supply system (10, 10a, 10b, 10c) comprising: the power transmission device that performs power transmission (Pi) of electric power to a power reception device (200, 200c) by the non-contact power supply; and the power reception device that receives the electric power, the power transmission device including: a power transmission coil (110) that performs the power transmission; a power source (130) that outputs the electric power for the power transmission to the power transmission coil; and a first control section (120, 120a, 120b) that controls the power transmission device, the power reception device including a power reception coil (210) that performs the power reception, the first control section including a plurality of modes (M) of control of the output, the plurality of modes including a cycle switching mode (M2) that causes the output to vary with a predetermined first cycle (C1).

2. The non-contact power supply system according to claim 1, wherein: the plurality of modes further include a normal mode (Ml) that causes the output to vary aperiodically.

3. The non-contact power supply system according to claim 2, wherein: the power transmission device includes an input section (140) that inputs information of at least the first cycle by operation from the outside.

4. The non-contact power supply system according to claim 3, wherein: the first cycle is the first cycle when a sum of a first period (Ton) during which the output is performed and a second period (Toff) during which the output is stopped is set as one cycle, the plurality of modes further include an on-off switching mode (M3) in which the first period and the second period are different, the on-off switching mode controls the output based on information of the first cycle.

5. The non-contact power supply system according to claim 4, wherein: the electric power is alternating current electric power of a second cycle (C2) that is shorter than the first cycle, the input section is able to input information of the second cycle, the plurality of modes include an efficiency variable mode (M4) that causes the second cycle in the first period to vary.

6. The non-contact power supply system according to any one of claims 2 to 5, wherein: the power reception device includes a power reception communication section (240) that transmits mode information that selects one of the plurality of modes to the power transmission device, the power transmission device includes a power transmission communication section (150) that communicates the mode information with the power reception communication section of the power reception device, the first control section performs one of the plurality of modes based on the mode information.

7. A test method that tests performance of a power transmission device that performs non-contact power transmission, the test method comprising: ​ (a) a process of preparing the power transmission device that performs power transmission to a power receiving device by the non-contact power feeding, i.e., a power transmission coil that performs the power transmission, a power source that outputs the power (Pi) for the power transmission to the power transmission coil, and a first control section that controls the power transmission device; (b) a process of preparing the power receiving device that includes a power receiving coil that receives the power for the test; (c) a process of preparing a test device that measures the performance; (d) a process of arranging the power transmission coil and the power receiving coil at predetermined relative positions that are not aligned with each other when the power transmission coil and the power receiving coil are within a range in which the non-contact power feeding is possible; and (e) a process of performing the output at a predetermined cycle.

8. The non-contact power feeding system according to claim 1, wherein the power receiving device is a standard device for the test.

9. A power transmission device that tests a performance of non-contact power feeding in a non-contact power feeding system, the non-contact power feeding system including: the power transmission device that performs power transmission of power to a power receiving device by the non-contact power feeding; and the power receiving device that receives the power, the power transmission device including: a power transmission coil that performs the power transmission; a power source that outputs the power for the power transmission to the power transmission coil; and a first control section that controls the power transmission device, the power receiving device including a power receiving coil that receives the power, the first control section including a plurality of modes that are controlled to change the output at a predetermined first cycle as a cycle switching mode.

10. A power receiving device that is a power receiving device of a non-contact power feeding system that tests a performance of a power transmission device that performs non-contact power feeding, the non-contact power feeding system including: the power transmission device that performs power transmission of power to a power receiving device by the non-contact power feeding; and the power receiving device that receives the power, the power transmission device including: a power transmission coil that performs the power transmission; a power source that outputs the power for the power transmission to the power transmission coil; and a first control section that controls the power transmission device, the power receiving device including a power receiving coil that receives the power, the first control section including a plurality of modes that are controlled to change the output at a predetermined first cycle as a cycle switching mode. ​ ​

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