Power supply system during driving

Abstract

A period for performing a pre-power supply check is provided before formal power supply from a power supply device (100) to a power receiving device (200). In the pre-power supply check, the power receiving side control unit (220) checks the power supplied from the power supply device (100) to the power receiving device (200) while the effective value of the output voltage of the inverter circuit (32) is fixed to a first voltage predetermined by a power supply side control unit (16) and the input voltage of the DC-DC converter (238) is fixed to a second voltage predetermined by a power receiving side control unit (220). When the power supplied is greater than the predetermined power, the power supply device (100) starts formal power supply.

Description

[0001] Citation of related applications

[0002] This application claims priority based on Japanese patent application No. 2019-098187 filed on May 27, 2019, and all the disclosed contents are incorporated into this application by reference. Technical Field

[0003] The present disclosure relates to a running power supply system that supplies electric power to a vehicle during running. Background Art

[0004] Japanese Patent Publication No. 2017-147821 discloses a wireless power receiving device that receives power wirelessly while a vehicle is traveling. The system starts charging of a charging unit when a voltage generated by a power receiving unit of the wireless power receiving device or a current flowing to the power receiving unit is detected to be above a reference value, and stops charging of the charging unit when the detected value is below the reference value, and supplies power from the capacitor unit to the charging unit. Summary of the invention

[0005] However, the voltage charged to the capacitor of the power receiving device changes depending on the voltage (inverter voltage) generated by the power supply device on the power supply side, so it is sometimes difficult to determine whether the vehicle is in a suitable position for charging the battery. In addition, when the vehicle is not in a suitable position, there is a problem that the inverter circuit of the power supply device flows useless current that does not contribute to charging the battery, causing loss, and further generating a leakage magnetic field.

[0006] According to one embodiment of the present disclosure, there is provided a power supply system for supplying power from a power supply device to a power receiving device during driving. In the power supply system for supplying power during driving, the power supply device has: an inverter circuit, the inverter circuit outputs alternating current; a power transmission unit, the power transmission unit is connected to the inverter circuit and transmits alternating current power; a power supply side control unit, the power supply side control unit controls the inverter circuit; and a power supply side communication unit, and the power receiving device has: a power receiving unit, the power receiving unit receives the alternating current power transmitted from the power transmission unit; a rectifier circuit, the rectifier circuit is connected to the power receiving unit and rectifies the received alternating current; a DC-DC converter, the DC-DC converter is connected to the rectifier circuit and converts and outputs a voltage; and a battery, the battery is connected to the output of the DC-DC converter. ; a load, the load is operated by the received power; a receiving-side control unit, the receiving-side control unit controls the DC-DC converter; and a receiving-side communication unit, wherein in the pre-power supply inspection, the receiving-side control unit checks the power supplied from the power supply device to the power receiving device while the effective value of the output voltage of the inverter circuit is fixed to the first voltage predetermined by the power supply-side control unit and the input voltage of the DC-DC converter is fixed to the second voltage predetermined by the power receiving-side control unit, and when the power supplied from the power supply device to the power receiving device is greater than the predetermined power, the power supply device starts to supply power formally. According to this mode, it is possible to determine whether the vehicle is in a position suitable for charging the battery, and it is possible to start the formal power supply without flowing a useless current that does not contribute to the charging of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is an explanatory diagram showing a contactless power supply system.

[0008] Figure 2 This is an explanatory diagram showing a circuit of a power supply device and a power receiving device.

[0009] Figure 3 It is an explanatory diagram showing a resonance circuit and a filter circuit of a power supply device.

[0010] Figure 4 It is an explanatory diagram showing the time changes of the voltage and current of each circuit during power supply.

[0011] Figure 5 It is the control flow chart of the power receiving side.

[0012] Figure 6 It is the control flow chart of the power supply side. DETAILED DESCRIPTION

[0013] like Figure 1As shown, the running power supply system 300 includes a power supply device 100 on the road 105 side and a power receiving device 200 on the vehicle 202 side. The running power supply system 300 is a system that can supply power from the power supply device 100 to the vehicle 202 while the vehicle 202 is running. The vehicle 202 is configured as an electric vehicle or a hybrid vehicle, for example. Figure 1 , the x-axis direction indicates the traveling direction of the vehicle 202 , the y-axis direction indicates the width direction of the vehicle 202 , and the z-axis direction indicates the vertical upward direction.

[0014] The power supply device 100 on the road 105 side includes: a plurality of coils 40 for power transmission (hereinafter also referred to as "power transmission coils 40"); a plurality of power transmission circuits 30, wherein the plurality of the power transmission circuits 30 supply an AC voltage to each of the plurality of power transmission coils 40; a plurality of vehicle position detection units 20, wherein the plurality of vehicle position detection units 20 are arranged corresponding to the power transmission circuits 30 or the power transmission coils 40; a power supply circuit 10, wherein the power supply circuit 10 supplies a DC voltage to the plurality of power transmission circuits 30; a power supply side control unit 16; a vehicle position detection unit 20; and a power supply side communication unit 22.

[0015] A plurality of power transmission coils 40 are arranged along the x direction at a predetermined depth from the surface of the road 105. The power transmission circuit 30 is a circuit that converts the DC voltage supplied from the power supply circuit 10 into a high-frequency AC voltage and applies it to the power transmission coil 40, and includes an inverter circuit and a resonant circuit. In addition, in addition to the inverter circuit and the resonant circuit, a filter circuit may also be included. The power transmission coil 40 and the power transmission circuit 30 are collectively referred to as the "power supply segment SG". In addition, there is also a case where it is simply referred to as "segment SG". The power supply circuit 10 is a circuit that supplies DC power to the power transmission circuit 30. For example, the power supply circuit 10 is configured as an AC / DC converter circuit that rectifies the AC supplied from a commercial power supply to output DC. In addition, the DC output by the power supply circuit 10 may not be completely DC, but may also contain a certain degree of variation (fluctuation).

[0016] The vehicle position detection unit 20 detects the position of the vehicle 202. The vehicle position detection unit 20 communicates with, for example, a vehicle side position sensor 225 provided on the vehicle 202, and uses the communication strength to detect whether the vehicle 202 is present in the segment SG. The plurality of power transmission circuits 30 transmit power using one or more power transmission coils 40 close to the vehicle 202 according to the position of the vehicle 202 detected by the vehicle position detection unit 20. The power supply side control unit 16 controls the power supply from the segment SG. In addition, the vehicle position detection unit 20 may also detect the position of the vehicle 202 using a camera, a search coil, and a laser.

[0017] The power supply side communication unit 22 communicates with the power receiving side communication unit 222 provided in the vehicle 202. This communication includes, for example, a power supply instruction, a formal power supply instruction, and a power supply instruction.

[0018] The vehicle 202 includes a battery 210, an auxiliary battery 215, a power receiving side control unit 220, a vehicle side position sensor 225, a power receiving circuit 230, a power receiving coil 240, a DC / DC converter circuit 260, an inverter circuit 270, a motor generator (MG) 280, and an auxiliary device 290. The power receiving coil 240 is connected to the power receiving circuit 230, and the battery 210, the high voltage side of the DC / DC converter circuit 260, and the inverter circuit 270 are connected to the output of the power receiving circuit 230. The auxiliary battery 215 and the auxiliary device 290 are connected to the low voltage side of the DC / DC converter circuit 260. The inverter circuit 270 is connected to the motor generator 280.

[0019] The power receiving coil 240 is a device that generates an induced electromotive force by electromagnetic induction with the power transmitting coil 40. The power receiving circuit 230 includes a rectifier circuit that converts the AC voltage output from the power receiving coil 240 into a DC voltage, and a DC / DC converter circuit that converts the DC voltage generated by the rectifier circuit into a voltage suitable for charging the battery 210. The DC voltage output from the power receiving circuit 230 can be used to charge the battery 210 and drive the motor generator 280 via the inverter circuit 270, and can also be used to charge the auxiliary battery 215 and drive the auxiliary device 290 by stepping down the voltage using the DC / DC converter circuit 260. In addition, a configuration may be provided with a plurality of power receiving coils 240. By providing a plurality of power receiving coils 240, it is possible to perform an optimal design that is robust to positional deviation of the vehicle 202. In addition, when a plurality of power receiving coils 240 are provided, the power receiving circuit 230 can also be multi-phased. By multi-phase, the power receiving circuit 230 can be provided as one, and the installation space of the vehicle 202 can be reduced.

[0020] The battery 210 is a secondary battery that outputs a relatively high DC voltage for driving the motor generator 280. The motor generator 280 operates as a three-phase AC motor and generates a driving force for the vehicle 202 to travel. The motor generator 280 operates as a generator when the vehicle 202 decelerates and regenerates electric power. When the motor generator 280 operates as a motor, the inverter circuit 270 converts the power of the battery 210 into a three-phase AC and supplies it to the motor generator 280. When the motor generator 280 operates as a generator, the inverter circuit 270 converts the three-phase AC regenerated by the motor generator 280 into a DC and supplies it to the battery 210.

[0021] The DC / DC converter circuit 260 converts the output of the battery 210 into a voltage lower than the output voltage of the battery 210 and supplies it to the auxiliary battery 215 and the auxiliary equipment 290. The auxiliary battery 215 is a secondary battery for driving the auxiliary equipment 290, and its voltage is relatively low. The auxiliary equipment 290 includes peripheral devices such as the air conditioner, the electric power steering, the headlights, the turn signals, and the wipers of the vehicle 202, and various accessories of the vehicle 202.

[0022] The power receiving-side control unit 220 controls each unit such as the inverter 270 in the vehicle 202. When receiving non-contact power feeding during driving, the power receiving-side control unit 220 controls the power receiving circuit 230 to perform power reception.

[0023] like Figure 2 As shown, the power supply device 100 on the road 105 side includes a power transmission circuit 30 and a power transmission coil 40. The power transmission circuit 30 includes an inverter circuit 32 and a resonant circuit 36. The inverter circuit 32 includes four switching transistors Tr1 to Tr4, a capacitor C3 and four protection diodes D1 to D4. The four switching transistors Tr1 to Tr4 form an H-bridge circuit. The switching transistors Tr1 and Tr3 are connected in series, and the switching transistors Tr2 and Tr4 are connected in series. The switching transistors Tr1 and Tr2 are connected to the positive power line V+, and the switching transistors Tr3 and Tr4 are connected to the negative power line V-. The intermediate node N1 of the switching transistors Tr1 and Tr3 and the intermediate node N2 of the switching transistors Tr2 and Tr4 are connected to the power transmission coil 40 via the resonant circuit 36. The protection diodes D1 to D4 are connected in parallel to each of the switching transistors Tr1 to Tr4. The capacitor C3 is a smoothing capacitor provided between the positive power line V+ and the negative power line V-. When the switching transistors Tr1 and Tr4 are turned on, the switching transistors Tr2 and Tr3 are turned off, and when the switching transistors Tr2 and Tr3 are turned on, the switching transistors Tr1 and Tr4 are turned off.

[0024] The resonant circuit 36 ​​is formed by the capacitor C1 inserted in series between the power transmission coil 40 and the inverter circuit 32. Therefore, in this embodiment, the resonant circuit 36 ​​forms a series resonant circuit. Alternatively, a parallel resonant circuit may be formed in which the capacitor C1 is connected in parallel to the power transmission coil 40 instead of the series resonant circuit.

[0025] like Figure 3 As shown, a filter circuit may be included between the inverter circuit 32 and the resonant circuit 36. When the resonant circuit 36 ​​is a series resonant circuit, a T-type filter circuit 34 having two coils and one capacitor may be used as the filter circuit. In addition, when the resonant circuit 36 ​​is a parallel resonant circuit, a bandpass filter circuit 35 in which a coil and a capacitor are connected in series may be used as the filter circuit.

[0026] The power receiving device 200 on the vehicle side includes a power receiving circuit 230 and a power receiving coil 240. The power receiving circuit 230 includes a resonant circuit 236, a rectifier circuit 232, and a DC-DC converter circuit 238. The resonant circuit 236 is formed by a capacitor C21 connected in series with the power receiving coil 240. Therefore, in the present embodiment, the resonant circuit 236 is a series resonant circuit. In addition, a parallel resonant circuit in which the capacitor C21 is connected in parallel with the power receiving coil 240 may be used instead of the series resonant circuit. Between the resonant circuit 236 and the rectifier circuit 232, a filter circuit similar to that of the power transmitting device 100 may also be included.

[0027] The rectifier circuit 232 is a bridge rectifier circuit, and includes four rectifier diodes D21 to D24 and a smoothing capacitor C23. The rectifier diodes D21 and D23 are connected in series, and the capacitor C21 of the resonance circuit 236 is connected to their intermediate node N3. The rectifier diodes D22 and D24 are connected in series, and the power receiving coil 240 is connected to their intermediate node N4. The cathode of the rectifier diode D21 and the cathode of the rectifier diode D22 are connected to the node Np, and the anode of the rectifier diode D23 and the anode of the rectifier diode D24 are connected to the node Nn. The smoothing capacitor C23 is connected to the node Np and the node Nn.

[0028] The DC-DC converter circuit 238 is a circuit that steps up or steps down the voltage of the direct current rectified by the rectifier circuit 232 and supplies it to the battery 210. The DC-DC converter circuit 238 includes four switching transistors Tr25 to Tr28, an inductor L28, protection diodes D25 to D28, and a smoothing capacitor C28. Between the node Np and the node Nn, the switching transistors Tr25 and Tr27 are connected in series, and the switching transistors Tr26 and Tr28 are connected in series. The inductor L28 is connected to the middle node N5 of the switching transistors Tr25 and Tr27 and the middle node N6 of the switching transistors Tr26 and Tr28. Protection diodes D25 to D28 are connected in parallel to each of the switching transistors Tr25 to Tr28. The smoothing capacitor C28 is arranged at a position closer to the battery 210 side than the four switching transistors Tr25 to Tr28.

[0029] Motor generator 280 is connected to battery 210 via inverter circuit 270 .

[0030] like Figure 4As shown, when the vehicle 202 is traveling on a normal road where the segment SG is not provided, the switching transistors Tr1 to Tr4 of the inverter circuit 32 of the power supply device 100 on the road 105 side are all turned off, the output V1 of the inverter circuit 32 is zero, and the output current I1 is also zero. In this case, since no voltage is applied to the power transmission coil 40 and no current flows, no voltage or current is generated in the power receiving coil 240 of the vehicle 202. The output voltage V2 of the rectifier circuit 232 is zero, and the output current I2 of the rectifier circuit 232 is also zero.

[0031] When the driver of the vehicle 202 wants to supply power to the vehicle 202, Figure 4 As shown, the lane is changed from a normal road without a segment SG to a power supply road with a segment SG. At time t1, when the power receiving side control unit 220 of the vehicle 202 detects that the vehicle 202 has moved to a position where power can be supplied from the segment SG, a pre-power supply check is performed. As to whether the position is a position where power can be supplied, the power receiving side control unit 220 may also determine, for example, based on the communication strength between the vehicle position detection unit 20 and the vehicle side position sensor 225. In the case where the signal of the vehicle position detection unit 20 has directivity, if the vehicle side position sensor 225 is within a specific range relative to the vehicle position detection unit 20, communication is possible.

[0032] During the pre-power supply inspection, the power receiving side control unit 220 fixes the effective value V1 of the output voltage of the inverter circuit 32 to a predetermined first voltage for the power supply side control unit 16. The first voltage is a voltage lower than the output voltage of the inverter circuit 32 when the formal power supply is performed. The power supply side control unit 16 can set the effective value V1 of the output voltage of the inverter circuit 32 to the predetermined first voltage by controlling the duty cycle of the output of the inverter circuit 32. In addition, when the relative position relationship between the power transmission coil 40 and the power receiving coil 240 is in a state where power transmission can be performed, the first voltage is preferably a lower value, and if possible, the first voltage is set to the minimum value that enables power transmission. This is to avoid unnecessary losses during the power supply inspection. In addition, when the output voltage is set to the first voltage, in order to avoid transient current changes, it is desirable to perform filtering processing. As Figure 4As shown, in order to avoid transient phenomena, the waveform of the effective value V1 of the output voltage when the output voltage is fixed to the first voltage can also be set to simulate the waveform after filtering. The power receiving side control unit 220 drives the switching transistors Tr25~Tr28 of the DC-DC converter circuit 238, and fixes the input voltage V2 of the DC-DC converter circuit 238 to the second voltage. The second voltage is set according to the power consumption of the auxiliary equipment 290 as the load, and the larger the power consumption of the auxiliary equipment 290, the larger the value is set. The effective value of the output current of the inverter circuit 32 is set to I1, and the output current of the rectifier circuit 232 is set to I2. The currents I1 and I2 vary according to the coupling coefficient k between the power transmitting coil 40 and the power receiving coil. As shown Figure 4 As shown, if the vehicle 202 changes lanes to directly above the segment SG, the coupling coefficient k increases. In addition, let the power supplied by the power supply device 100 be P1, and the power received by the power receiving device 200 be P2. P1 = V1 * I1, P2 = V2 * I2.

[0033] There is a relationship represented by the following formula (1) between the voltages V1, V2, the currents I1, I2, the inductance L1 of the power transmission coil 40, the resistance R1, the inductance L2 of the power receiving coil 240, the resistance R2, and the coupling coefficient k. When solving formula (1) for the coupling coefficient k, formula (2) is obtained. If the frequency of the inverter circuit 32 is set to f, then in formula (2), ω=2πf. In addition, in formula (2), the value of the coupling coefficient k is a value greater than or equal to 0 and less than or equal to 1, and varies according to the relative position of the power transmission coil 40 and the power receiving coil 240, and becomes larger when the power transmission coil 40 and the power receiving coil 240 are close.

[0034] [Mathematical formula 1]

[0035] [Formula 1]

[0036]

[0037] [Mathematical formula 2]

[0038] [Formula 2]

[0039]

[0040] When the vehicle 202 changes lanes and enters the power supply road, the relative positions of the power transmission coil 40 and the power reception coil 240 are close, and the coupling coefficient k increases. That is, in this case, if V2 is set constant, the output current I2 increases. Then, at time t2, the output current I2 of the rectifier circuit 232 exceeds the threshold value I th . Threshold I th The power consumption P of the auxiliary equipment 290 as a load during the pre-power supply inspection is used.a , power transmission efficiency η p and the battery voltage V of the battery 210 b , the power receiving side control unit 220 sets the threshold value I th The power transmission efficiency η is set to the value shown by the following formula (3). p It is a combination of the power transmission efficiency between the power transmission coil 40 and the power reception coil 240 and the conversion efficiency in the DC-DC converter circuit 238 and is obtained through experiments.

[0041] I th =(P a / η p ) / V b …(3)

[0042] If we calculate and set the threshold I th , then when the output current I2 of the rectifier circuit 232 exceeds the threshold value I th In this case, even if the auxiliary equipment 290 as the load consumes the supplied power, the power can be charged to the battery 210.

[0043] When it is detected that the output current I2 of the rectifier circuit 232 exceeds the threshold value I th At the time t1, the power receiving side control unit 220 issues a formal power supply instruction to the power supply side control unit 16 through communication from the power receiving side communication unit 222 via the power supply side communication unit 22. The formal power supply is a process in which the power supply side control unit 16 performs power supply by increasing the effective value V1 of the output voltage of the inverter circuit 32 to a voltage higher than the first voltage. For example, compared with the time t1, the power supply side control unit 16 can increase the effective value V1 of the output voltage of the inverter circuit 32 to a voltage higher than the first voltage by increasing the duty cycle of the inverter circuit 32.

[0044] use Figure 5 , the power receiving flow chart performed by the power receiving side control unit 220 is described. In step S100, when the vehicle side position sensor 225 detects that the vehicle 202 enters the power supply road based on the signal received from the vehicle position detection unit 20, the power receiving side control unit 220 transfers to step S110.

[0045] In step S110 , the power receiving-side control unit 220 instructs the power supplying-side control unit 16 to supply power for inspection. This instruction is made by communication from the power receiving-side communication unit 222 via the power supplying-side communication unit 22 .

[0046] In step S120, the power receiving side control unit 220 drives the DC-DC converter 238 to fix the input voltage of the DC-DC converter 238 to a predetermined second voltage and monitors the current I2 flowing from the rectifier circuit. thIn the above case, it is determined that the pre-power supply inspection is qualified, and the process moves to step S130. When the current I2 is less than the threshold I th In the case of the above, it is determined that the pre-power supply inspection is unqualified and the process moves to step S170.

[0047] In step S130 , the power receiving-side control unit 220 instructs the power supplying-side control unit 16 to officially supply power.

[0048] Next, in step S140, the power receiving side control unit 220 determines whether the input current of the battery 210 is negative. The fact that the input current of the battery 210 is negative means that the battery 210 is not charged but the power of the battery 210 is supplied to the outside. If the input current of the battery 210 is negative, the power receiving side control unit 220 transfers the process to step S190, and if the input current of the battery 210 is not negative, the process is transferred to step S150.

[0049] In step S150, when the vehicle position sensor 225 detects that the vehicle 202 has left the power supply road based on the signal received from the vehicle position detector 20, the power receiving control unit 220 shifts the process to step S160. In step S160, the power receiving control unit 220 instructs the power supply control unit 16 to stop power supply.

[0050] In step S170, when the vehicle position sensor 225 detects that the vehicle 202 has left the power supply road based on the signal received from the vehicle position detection unit 20, the power receiving side control unit 220 transfers the process to step S180. In step S180, the power receiving side control unit 220 instructs the power supply side control unit 16 to stop the power supply for inspection. This is because there is a case where the vehicle 202 has left the power supply road after approaching the power supply road. In the case where the vehicle 202 has not left the power supply road, the power receiving side control unit 220 transfers the process to step S120 and continues the pre-power supply inspection.

[0051] In step S190 , the power receiving-side control unit 220 instructs the power supplying-side control unit 16 to stop power supply, and then the process shifts to step S110 .

[0052] use Figure 6 , the power supply flow chart performed by the power supply side control unit 16 is described. In step S200, when receiving the instruction of power supply for inspection from the power receiving side control unit 220 (step S110), the power supply side control unit 16 transfers the processing to step S210. In step S210, the switching transistors Tr1 to Tr4 of the inverter circuit 32 are turned on and off to control the output voltage V1 of the inverter circuit 32 to be the first voltage.

[0053] In step S220, when receiving the instruction to supply power from the power receiving control unit 220 (step S130), the power supply control unit 16 moves the process to step S230. When not receiving the instruction to supply power, the power supply control unit 16 moves the process to step S260.

[0054] In step S230 , the on / off of the switching transistors Tr1 to Tr4 of the inverter circuit 32 is controlled so that the output voltage V1 of the inverter circuit 32 becomes a voltage for actual power supply higher than the first voltage.

[0055] In step S240, when receiving an instruction to stop power supply from the power receiving side control unit 220 (step S160 or S190), the power supply side control unit 16 transfers to step S250 and stops power supply. In step S240, when not receiving an instruction to stop power supply from the power receiving side control unit 220, the power supply side control unit 16 transfers to step S230 and continues to supply power.

[0056] In step S260, when receiving the instruction to stop the inspection power supply from the power receiving side control unit 220 (step S180), the power supply side control unit 16 transfers to step S250 and stops the power supply. In step S260, when not receiving the instruction to stop the inspection power supply from the power receiving side control unit 220, the power supply side control unit 16 transfers to step S210 and continues the inspection power supply.

[0057] As described above, according to the present embodiment, in a state where the power supply side control unit 16 fixes the effective value V1 of the output voltage of the inverter circuit 32 to a predetermined first voltage, and the power receiving side control unit 220 fixes the input voltage V2 of the DC-DC converter circuit 238 to a predetermined second voltage, it is possible to simply check whether the expected power can be received and the battery 210 can be charged.

[0058] In addition, when the voltage V2 is fixed, the received power is proportional to the current I2. Here, the measurement of the current I2 is easier than the measurement of the power. Therefore, as described above, the power receiving side control unit 220 compares the current I2 output from the rectifier circuit 232 with the threshold value I2. th Alternatively, when the power supplied from power supply device 100 to power receiving device 200 during the pre-power-receiving check is equal to or greater than a predetermined power, power receiving-side control unit 220 may cause power supply device 100 to start the formal power supply.

[0059] Furthermore, when power is supplied from the power supply device 100 to the power receiving device 200, power supply is not performed when the coupling coefficient k is small and the power transmission efficiency is low, and power supply is started after sufficient power transmission efficiency is achieved. This improves the overall power supply efficiency.

[0060] In addition, when the received electric power is consumed by motor generator 280 instead of passing through battery 210, if the power consumption of motor generator 280 is set to P m , the power receiving side control unit 220 may also set the threshold value I th It is set to the value shown in the following formula (4).

[0061] I th =(P a / η p -P m ) / V b …(4)

[0062] If we calculate and set the threshold I th , then when the output current I2 of the rectifier circuit 232 exceeds the threshold value I th Even if the power consumption P of the motor generator 280 is considered 3m , and can also charge the battery 210 with electricity.

[0063] In this embodiment, the case where the power transmission unit has a power transmission coil 40 and the power receiving unit has a power receiving coil 240, and the power supply from the power transmission unit to the power receiving unit is performed in a non-contact manner is described as an example, but it can also be the case that the power transmission unit has a power transmission terminal and the power receiving unit has a power receiving terminal, and the power supply from the power transmission unit to the power receiving unit is performed after the power transmission terminal and the power receiving terminal are in contact. In the case of the contact type, if the influence of resistance is eliminated, the coupling coefficient k is substantially 1. The power receiving side control unit 220 issues an instruction for power supply for inspection, and can immediately adjust the current I2 to the threshold value I th The comparison is made to determine whether to implement formal power supply.

[0064] In the above-mentioned embodiment, the power supply side communication unit 22 and the power receiving side communication unit 222 are included, and the communication of the instructions for the inspection power supply and the formal power supply is performed between the power supply side communication unit 22 and the power receiving side communication unit 222. The communication between the power supply side control unit 16 and the power receiving side control unit 220 can also be performed by superimposing a signal on the alternating current between the power transmission coil 40 and the power receiving coil 240, for example.

[0065] The present disclosure is not limited to the above-mentioned embodiments, and can be implemented by various structures within the scope of the above-mentioned subject matter. For example, the technical features in each embodiment corresponding to the technical features in each method described in the invention content section can be appropriately replaced or combined to solve part or all of the above-mentioned technical problems, or to achieve part or all of the above-mentioned effects. Moreover, the above-mentioned technical features can be appropriately deleted as long as they are not described as necessary structures in this specification.

Claims

1. A running power supply system, wherein the running power supply system supplies power from a power supply device to a power receiving device, The power supply device comprises: An inverter circuit, wherein the inverter circuit outputs alternating current; a power transmission unit connected to the inverter circuit and transmitting AC power; as well as a power supply side control unit, the power supply side control unit controlling the inverter circuit, The power receiving device comprises: a power receiving unit that receives the AC power transmitted from the power transmitting unit; a power receiving circuit including: a rectifier circuit for rectifying the AC power received by the power receiving unit; and a DC-DC converter, which converts and outputs the voltage rectified by the rectifier circuit; a battery connected to an output of the power receiving circuit; a load operated by the electric power rectified by the rectifying circuit; as well as a power receiving side control unit, the power receiving side control unit controlling the DC-DC converter, A period for performing a pre-power supply inspection is provided before the power supply device actually supplies power to the power receiving device. In the pre-power supply check, the power receiving-side control unit checks the power supplied from the power supply device to the power receiving device in a state where the effective value of the output voltage of the inverter circuit is fixed to a first voltage predetermined by the power supply-side control unit and the input voltage of the DC-DC converter is fixed to a second voltage predetermined by the power receiving-side control unit, and when it is determined that the power supplied is greater than a predetermined power based on the current flowing out of the rectifier circuit being greater than a threshold value, the power supply device starts formally supplying power.

2. The power supply system during driving according to claim 1, characterized in that: The power receiving-side control unit sets the second voltage based on the power consumption of the load when the pre-power supply inspection is started.

3. The power supply system during driving according to claim 1, characterized in that: The power transmission unit is a power transmission coil, The power receiving unit is a power receiving coil, The power transmission unit supplies power to the power reception unit in a contactless manner.

4. The power supply system during driving according to claim 2, characterized in that: The power transmission unit is a power transmission coil, The power receiving unit is a power receiving coil, The power transmission unit supplies power to the power reception unit in a contactless manner.

5. The power supply system during driving according to claim 3, characterized in that: In the pre-power supply inspection, the power receiving-side control unit calculates the power supply power based on the current and voltage of the power receiving coil.

6. The power supply system during driving according to claim 4, characterized in that: In the pre-power supply inspection, the power receiving-side control unit calculates the power supply power based on the current and voltage of the power receiving coil.

7. The power supply system during driving according to claim 1, characterized in that: The threshold value is a current value calculated from (power consumption of the load / efficiency of the DC-DC converter) / (voltage of the battery).

8. The power supply system during driving according to claim 1, characterized in that: further comprising a motor generator driven by electric power received without passing through the battery, The threshold value is a current value calculated from ((power consumption of the load / efficiency of the DC-DC converter)−power consumption of the motor generator) / (voltage of the battery).

9. The power supply system during driving according to any one of claims 3 to 8, characterized in that: The power receiving side control unit detects the current input to the battery after starting formal power supply, and continues formal power supply when the current input to the battery is greater than zero, and stops formal power supply and performs the pre-power supply check when the current input to the battery is less than zero.

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