JP6252334B2 - Contactless power supply system - Google Patents

Description

  The present invention relates to a non-contact power feeding system that performs non-contact power transmission from a power transmission side resonance circuit to a power reception side resonance circuit.

  2. Description of the Related Art Conventionally, as a non-contact power feeding system that uses a power transmission side coil and a power receiving side coil as a pair and performs non-contact power transmission from the power transmission side coil to the power receiving side coil, for example, there is a non-contact power feeding system disclosed in Patent Document 1 . This non-contact power supply system is a system in which power is supplied to a vehicle as a power supply target from the outside of the vehicle in a non-contact manner, thereby charging an in-vehicle battery. The non-contact power feeding system includes a power transmission side resonance circuit including a power transmission side coil and a power transmission side capacitor, and a power reception side resonance circuit including a power reception side coil and a power reception side capacitor.

  The power transmission side coil is installed at a predetermined position on the ground surface of the parking space, and generates alternating magnetic flux when AC is supplied. The power receiving side coil is installed at the bottom of the vehicle, and when the vehicle is parked in the parking space, the power receiving side coil is arranged facing the power transmitting side coil with a space in the vertical direction, and is linked to the alternating magnetic flux generated by the power transmitting side coil. By doing so, alternating current is generated by electromagnetic induction.

JP 2012-105503 A

  In the above contactless power supply system, if a malfunction occurs or a communication delay occurs between the power transmission side control unit and the power reception side control unit, the power reception side resonance circuit is not suitable for receiving power. It is conceivable that electric power is transmitted from the circuit to the power receiving side resonance circuit. Further, it is conceivable that excessive power is transmitted from the power transmission side resonance circuit to the power reception side resonance circuit. As described above, when power is transmitted from the power transmission side resonance circuit to the power reception side resonance circuit in an inappropriate state, an overvoltage or an overcurrent may be applied to the power reception side resonance circuit.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a non-contact power feeding system capable of appropriately protecting the power receiving side resonance circuit.

  The present invention includes a power transmission side coil (37) and a power transmission side capacitor (36), and a power transmission side resonance circuit (17) that generates magnetic flux in the power transmission side coil by being supplied with AC power, and a power reception side coil ( 38) and a power receiving side capacitor (39), and a power receiving side resonance circuit (19) that receives AC power by interlinking magnetic flux generated in the power transmitting side coil. And a power receiving side filter circuit (22) provided on the output side of the power receiving side resonance circuit and including a reactor (40, 41), and an opening / closing means constituting a closed circuit including the power receiving side resonance circuit and the reactor ( 90, 91) and a command to temporarily close the open / close means, and in that state, perform test power transmission from the power transmission side resonance circuit to the power reception side resonance circuit. A power transmission execution means (80) and an abnormality determination means for determining whether or not the switching means is abnormal based on the power output from the power receiving side resonance circuit in a state where the test power transmission is being performed by the test power transmission execution means (80).

  According to the above configuration, when power is transmitted from the power transmission side resonance circuit to the power reception side resonance circuit in an inappropriate state, the resonance frequency of the power reception side resonance circuit is set to the resonance of the power transmission side resonance circuit by closing the opening / closing means. The power supplied from the power transmission side resonance circuit to the power reception side resonance circuit is suppressed by shifting from the frequency. At this time, power supplied from the power transmission side resonance circuit to the power reception side resonance circuit is consumed in the reactor.

  Here, when a normally open abnormality has occurred in the opening / closing means, a closed circuit cannot be formed by the power receiving side resonance circuit and the reactor, and it cannot be suppressed that excessive power is output from the power receiving side resonance circuit. Inconvenience arises. Therefore, a command to temporarily close the opening / closing means is issued, and test power transmission from the power transmission side resonance circuit to the power reception side resonance circuit is performed in that state. If the switching means is instructed to be closed while the opening / closing means is operating normally, the resonance frequency of the power reception side resonance circuit deviates from the resonance frequency of the power transmission side resonance circuit, and power is not output from the power reception side resonance circuit. Further, if the opening / closing means is instructed to be closed when the opening / closing means is in an abnormal state, the opening / closing means is not closed. For this reason, the resonance frequency of the power reception side resonance circuit and the resonance frequency of the power transmission side resonance circuit remain the same, and power is transmitted from the power transmission side resonance circuit to the power reception side resonance circuit. Is output.

  In other words, since the output of the power receiving side resonance circuit varies depending on whether or not there is an abnormality in the switching means, it is possible to suitably determine the abnormality of the switching means based on the power output from the power receiving side resonance circuit. . Therefore, it is possible to prevent power transmission from being performed while the opening / closing means is abnormal, and as a result, it is possible to suppress the application of overvoltage or overcurrent to the output side of the power reception side resonance circuit and the power reception side resonance circuit.

The electric block diagram showing the non-contact electric power feeding system in 1st Embodiment. The flowchart showing the power transmission test process in 1st Embodiment. The electrical block diagram showing the non-contact electric power feeding system in 2nd Embodiment. The flowchart showing the power transmission test process in 2nd Embodiment. The electrical block diagram showing the non-contact electric power feeding system in a modification. The electrical block diagram showing the non-contact electric power feeding system in a modification.

(First embodiment)
The contactless power supply system in the present embodiment includes a power transmission device that is supplied with power from a commercial power source and transmits power to the power receiving device in a contactless manner, and a power receiving device that receives power from the power transmission device in a contactless manner. The power receiving device is mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and charges the in-vehicle battery by outputting electric power to the in-vehicle battery. Moreover, the power transmission device is provided in a parking space where the vehicle is parked.

  FIG. 1 shows a non-contact power feeding system 10 in the present embodiment. The non-contact power supply system 10 transmits the power supplied from the DC power supply 11 from the power transmission device 12 to the power reception device 13 mounted on the vehicle in a contactless manner. And the power receiving apparatus 13 outputs the transmitted electric power with respect to the vehicle-mounted battery 14, and performs charging.

  The power transmission device 12 includes a step-down circuit 15 that steps down power supplied from the DC power supply 11, an inverter circuit 16 that converts DC power output from the step-down circuit 15 into AC power having a predetermined frequency, and a device that receives AC power. 13 is provided with a power transmission side resonance circuit 17 that outputs the power to 13. Further, a power transmission side filter circuit 18 that removes AC power other than a predetermined frequency range from the AC power input from the inverter circuit 16 and outputs the power to the power transmission side resonance circuit 17 is provided.

  The power receiving device 13 is supplied from the power receiving side resonance circuit 19 to which power is supplied from the power transmission side resonance circuit 17, the rectification circuit 20 that full-wave rectifies the AC power supplied from the power reception side resonance circuit 19, and the rectification circuit 20. And a booster circuit 21 that boosts the power to a predetermined voltage. In addition, a power receiving side filter circuit 22 that removes AC power other than a predetermined frequency range from the AC power input from the power receiving side resonance circuit 19 and outputs the AC power to the rectifier circuit 20 is provided.

  The step-down circuit 15 is a well-known step-down chopper circuit and is connected to the DC power supply 11. The step-down circuit 15 includes a capacitor 23 for smoothing power supplied from the DC power supply 11, a reactor 24 for storing power, a capacitor 25 for smoothing output voltage, a switch 26 for adjusting the output voltage, and the switch 26 being off. A diode 27 is provided for passing a current to the reactor 24 when it is in a state. The switch 26 is an insulated gate bipolar transistor (IGBT), and includes a diode component connected in antiparallel between a collector and an emitter.

  The inverter circuit 16 is a known full-bridge type inverter circuit, and is provided on the output side of the step-down circuit 15. The inverter circuit 16 includes switches 28 to 31, and the DC power supplied from the step-down circuit 15 is converted into AC power having a predetermined frequency by alternately turning on and off the switches 28 to 31. Note that the switches 28 to 31 are IGBTs.

  The power transmission side resonance circuit 17 is configured by connecting a power transmission side capacitor 36 and a power transmission side coil 37 in parallel. The power receiving side resonance circuit 19 is configured by connecting a power receiving side coil 38 and a power receiving side capacitor 39 in parallel.

  The power transmission side coil 37 and the power reception side coil 38 are each sealed with a plate-shaped resin, and a power transmission pad is constituted by a resin that seals the power transmission side coil 37 and the power transmission side coil 37. The power reception side coil 38 and the power reception side A power receiving pad is formed of a resin that seals the coil 38. The power transmission pad is provided at a predetermined position on the ground surface of the parking space, and the power reception pad is provided at the bottom of the vehicle. When the vehicle is parked in the parking space, the power transmission pad and the power receiving pad are arranged facing each other in the vertical direction at a predetermined interval. Then, AC power is supplied to the power transmission side coil 37 in the facing state, and the alternating magnetic flux generated by the AC power is linked to the power reception side coil 38, thereby generating AC power in the power reception side coil 38 by electromagnetic induction.

  The size of the inductive component of the power transmission side coil 37 and the power reception side coil 38 and the size of the capacitance component of the power transmission side capacitor 36 and the power reception side capacitor 39 are determined when the power transmission pad and the power reception pad are in a predetermined facing state. Further, the power factor of the inverter circuit 16 is set to be 1 or a value close to 1.

  The rectifier circuit 20 is a full-bridge type full-wave rectifier circuit including four diodes 44 to 47, and converts AC power supplied from the power receiving side resonance circuit 19 into DC.

  The booster circuit 21 is a well-known boost chopper circuit, is connected to the output side of the rectifier circuit 20, boosts the power output from the rectifier circuit 20, and outputs the boosted power to the in-vehicle battery 14. The booster circuit 21 includes a capacitor 48 for smoothing the power supplied from the rectifier circuit 20, a reactor 49 for accumulating power, a capacitor 50 for smoothing the output voltage, a switch 51 for adjusting the output voltage, and the switch 51 being off. A diode 52 through which current flows when in a state is provided. The switch 51 is an IGBT.

  Main relays 53 and 54 are respectively provided between the two output terminals of the booster circuit 21 and the in-vehicle battery 14. The main relays 53 and 54 are turned off, so that the connection between the power receiving device 13 and the in-vehicle battery 14 is cut off. When charging the in-vehicle battery 14, the main relays 53 and 54 are in principle turned on.

  The power transmission side filter circuit 18 is a bandpass filter including reactors 32 and 33 and capacitors 34 and 35, and is provided between the inverter circuit 16 and the power transmission side resonance circuit 17. In the power transmission side filter circuit 18, the reactor 32 and the capacitor 34, the reactor 33 and the capacitor 35 are connected in series. A capacitor 34 is connected to one of the output terminals of the inverter circuit 16 and a capacitor 35 is connected to the other. In other words, the power transmission side filter circuit 18 is configured by connecting in parallel the bandpass filter composed of the reactor 32 and the capacitor 34 and the bandpass filter composed of the reactor 33 and the capacitor 35.

  The power reception side filter circuit 22 is a bandpass filter including reactors 40 and 41 and capacitors 42 and 43, and is provided between the power reception side resonance circuit 19 and the rectification circuit 20. In the power receiving side filter circuit 22, the reactor 40 and the capacitor 42, the reactor 41 and the capacitor 43 are respectively connected in series. And the reactor 40 is connected to one of the output terminals of the power receiving side resonance circuit 19, and the reactor 41 is connected to the other. In other words, the power receiving side filter circuit 22 is configured by connecting in parallel the bandpass filter composed of the reactor 40 and the capacitor 42 and the bandpass filter composed of the reactor 41 and the capacitor 43.

  The size of the inductive component of reactors 32, 33, 40, and 41 so that the resonance frequency (pass band) of each of the band-pass filters connected in parallel is the frequency of the AC power output from inverter circuit 16. And the magnitude | size of the capacitance component of capacitor | condenser 34,35,42,43 is determined. Moreover, in the power transmission side filter circuit 18 and the power reception side filter circuit 22, the heat generation in the band pass filter can be dispersed by connecting two band pass filters in parallel.

  In addition, the power transmission device 12 is provided with a power transmission side control unit 60 that controls the power transmission device 12, and the power reception device 13 is provided with a power reception side control unit 70 that controls the power reception device 13. The power transmission side control unit 60 controls the step-down circuit 15 and the inverter circuit 16. The power receiving side control unit 70 controls the booster circuit 21.

  Further, the vehicle is provided with an ECU 80 (Electronic Control Unit) and a charge start button (not shown). When the charging start button is pressed by the user while the vehicle is stopped, ECU 80 starts power transmission from power transmission device 12 to power reception device 13. Specifically, the ECU 80 gives commands to the control units 60 and 70 and controls on / off of the main relays 53 and 54. The control units 60 and 70 and the ECU 80 are microcomputers including a CPU that is an arithmetic unit, a RAM that is a main storage device, and the like. Communication between the power transmission side control unit 60 and the ECU 80 is performed wirelessly, and communication between the power reception side control unit 70 and the ECU 80 is performed by wire.

  Here, when an abnormality occurs in the in-vehicle battery 14 during power transmission from the power transmitting device 12 to the power receiving device 13, the ECU 80 stops charging the in-vehicle battery 14. Specifically, the ECU 80 turns off the main relays 53 and 54 and instructs the power transmission side control unit 60 and the power reception side control unit 70 to stop the power output. In this case, with the delay of the command signal from the ECU 80 to the power transmission side control unit 60, power transmission from the power transmission device 12 to the power reception device 13 may be continued after the main relays 53 and 54 are turned off. As a result, an overvoltage is applied to the rectifier circuit 20 and the booster circuit 21, which may cause damage to the elements of the power receiving device 13.

  In addition, when power is transmitted from the power transmission device 12 to the power reception device 13, there is a concern that an abnormality occurs in the power transmission device 12 and excessive power is transmitted from the power transmission device 12 to the power reception device 13. In this case, an overvoltage is applied to the rectifier circuit 20, the booster circuit 21, and the in-vehicle battery 14.

  In view of the above problem, a protection switch 90 as an opening / closing means is provided for the power receiving side filter circuit 22. The protection switch 90 is connected to the terminal on the rectifier circuit 20 side of the reactor 40 of the power receiving side filter circuit 22 and the terminal on the power receiving side resonance circuit 19 side of the reactor 41. In other words, the protection switch 90 is provided on a path that connects the power-receiving-side resonance circuit 19 and the reactor 40 to form a closed circuit. The protection switch 90 is a normally closed switch, and is controlled by the power receiving side control unit 70. When charging the in-vehicle battery 14, the protection switch 90 is turned off.

  When power transmission from the power transmission device 12 to the power reception device 13 is performed in a state unsuitable for power transmission, the protection switch 90 is turned on, and the power reception side resonance circuit 19 and the reactor 40 constitute a closed circuit. When the closed circuit is formed, the resonance frequency of the power reception side resonance circuit 19 shifts, the coupling coefficient between the power transmission side resonance circuit 17 and the power reception side resonance circuit 19 decreases, and the power supplied to the power reception side resonance circuit 19 decreases. . When the protection switch 90 is turned on, the power supplied to the power receiving resonance circuit 19 flows to the reactor 40 and the power is consumed in the reactor 40. Thus, fail-safe processing is performed by turning on the protection switch 90, and it is possible to suppress the occurrence of overvoltage and overcurrent in the power receiving device 13 and the in-vehicle battery 14.

  Further, the ECU 80 in this embodiment determines whether or not the protection switch 90 operates normally before power transmission from the power transmission device 12 to the power reception device 13 is started. By performing the abnormality determination of the protection switch 90 in this way, the fail safe process by the protection switch 90 can be reliably performed.

  As an abnormality determination of the protection switch 90, test power smaller than that at the time of charging the in-vehicle battery 14 is transmitted from the power transmission device 12 while controlling the protection switch 90 to be in an ON state. Then, the input side voltage (voltage across the capacitor 48) of the booster circuit 21 is detected, and when the detected value is equal to or less than a predetermined value, it is determined that the protection switch 90 is operating normally. Further, when the detected value of the input side voltage of the booster circuit 21 is larger than a predetermined value, it is determined that the normally open abnormality has occurred in the protection switch 90.

  FIG. 2 shows a flowchart representing the power transmission test process. This process is performed by the ECU 80 at a predetermined cycle while the vehicle is stopped.

  In step S11, it is determined whether or not it is a test execution period. Whether or not it is the test execution period is determined based on whether or not the charging start button is pressed by the user. If it is determined that it is not the test execution period (S11: NO), the process is terminated. If it is determined that it is the test execution period (S11: YES), it is determined in step S12 whether or not the establishment of the communication path between the power transmission side control unit 60 and the ECU 80 has been completed. Here, establishment of the communication path means that the power transmission side control unit 60 and the ECU 80 are in a state where they can communicate information with each other. If the establishment of the communication path is not completed (S12: NO), the process ends.

  If the communication path between the power transmission side control unit 60 and the ECU 80 has been established (S12: YES), it is determined in step S13 whether or not a test command has been transmitted to the power reception side control unit 70. Here, the test command is a command transmitted to the power receiving side control unit 70 so that the power receiving device 13 is in a state suitable for starting the abnormality determination of the protection switch 90. When the test command has not been transmitted (S13: YES), the test command is transmitted to the power receiving side control unit 70 in step S14. When receiving the test command, the power receiving side control unit 70 turns on the protection switch 90 and transmits to the ECU 80 a signal indicating that the power receiving device 13 has shifted to a state suitable for abnormality determination of the protection switch 90. To do.

  If it is determined that the test command has been transmitted (S13: NO), it is determined in step S15 whether or not it has been confirmed that the power receiving device 13 has shifted to the test state. If it is not confirmed that the power receiving device 13 has shifted to the test state (S15: NO), in step S16, it is determined whether or not a signal indicating that the power receiving device 13 has shifted to the test state has been received. To do.

  When the signal indicating the transition to the test state is received from the power receiving side control unit 70 (S16: YES), a power transmission command of the test power is transmitted to the power transmission side control unit 60 in step S17. Upon receiving the command, the power transmission side control unit 60 controls the step-down circuit 15 and the inverter circuit 16 to transmit test power from the power transmission side resonance circuit 17. Here, the test power is set to a value (for example, 50 W) lower than the power (for example, 3 kW) transmitted from the power transmission device 12 when charging the in-vehicle battery 14. The test power is transmitted temporarily, for example, for one second. If the signal indicating that the test state has shifted to the test state has not been received from the power receiving side control unit 70 (S16: NO), it is determined in step S18 that an abnormality has occurred in the protection switch 90, and the process ends.

  When it is confirmed that the power receiving device 13 has shifted to the test state (S15: NO), in step S19, it is determined whether or not the input voltage of the booster circuit 21, which is the output voltage of the power receiving side resonance circuit 19, is equal to or lower than a predetermined value. judge. If the input voltage of the booster circuit 21 is equal to or lower than the predetermined value (S19: YES), it is determined in step S20 that the protection switch 90 is normal, and a command is issued to the power receiving side control unit 70 to shift to the normal state. The process is terminated. The power receiving side control unit 70 turns off the protection switch 90 when receiving the instruction to shift to the normal state. After the power receiving side control unit 70 shifts to the normal state, power transmission for charging the in-vehicle battery 14 is started. If the input voltage of the booster circuit 21 is greater than the predetermined value (S19: NO), it is determined in step S21 that the protection switch 90 is not functioning effectively and an abnormality has occurred in the protection switch 90, and processing is performed. Exit.

  Hereinafter, effects in the present embodiment will be described.

  When the protection switch 90 is commanded to turn on while the protection switch 90 is operating normally, the resonance frequency of the power reception side resonance circuit 19 is shifted from the resonance frequency of the power transmission side resonance circuit 17, and the power from the power reception side resonance circuit 19 Will not be output. Further, if the protection switch 90 is commanded to turn on when the protection switch 90 is abnormal, the protection switch 90 is not turned on. For this reason, the resonance frequency of the power reception side resonance circuit 19 and the resonance frequency of the power transmission side resonance circuit 17 remain equal, and power transmission from the power transmission side resonance circuit 17 to the power reception side resonance circuit 19 is performed. Power is output from the resonance circuit 19. That is, since the output of the power reception side resonance circuit 19 varies depending on whether or not the protection switch 90 is abnormal, the abnormality of the protection switch 90 is suitably determined based on the power output from the power reception side resonance circuit 19. can do.

  By performing abnormality determination processing of the protection switch 90 before transmitting power for charging the in-vehicle battery 14, it is possible to suppress power from being continuously transmitted while the abnormality occurs in the protection switch 90. Can do. Thereby, it can suppress that excessive electric power is output from the receiving side resonance circuit 19 suitably.

  The transmission power in the abnormality determination process of the protection switch 90 is set to be smaller than the transmission power when charging the in-vehicle battery 14. As a result, if an abnormality occurs in the protection switch 90, it is possible to prevent an excessive amount of power from being output from the power receiving resonance circuit 19 when the abnormality of the protection switch 90 is determined.

(Second Embodiment)
A non-contact power feeding system 10A of the second embodiment is shown in FIG. The contactless power supply system 10A of the second embodiment is a switch that constitutes an opening / closing means with respect to the contactless power supply system 10 of the first embodiment. 91 is added. The second protection switch 91 is provided in parallel with the first protection switch 90, and is turned on / off by the power receiving side control unit 70. The power receiving side control unit 70 instructs each of the switches 90 and 91 to individually switch the on / off state of the first protection switch 90 and the second protection switch 91. When either one of the first protection switch 90 and the second protection switch 91 is turned on, application of an overvoltage to the rectifier circuit 20 and the booster circuit 21 can be suppressed.

  The first protection switch 90 is a relay switch, and the second protection switch 91 is a semiconductor switch. The first protection switch 90 allows a large current to flow for a longer time than the second protection switch 91. The second protection switch 91 is more responsive to switching between on and off states than the first protection switch 90. Therefore, when an abnormality occurs, the power receiving side control unit 70 instructs the first protection switch 90 and the second protection switch 91 to be turned on. When the command is given in this way, the second protection switch 91 having high switching responsiveness is quickly turned on, and it is possible to suppress the overvoltage from being applied to the rectifier circuit 20 and the booster circuit 21. Thereafter, when the first protection switch 90 is turned on, it is possible to suppress the occurrence of an abnormality in the second protection switch 91 as a large current flows through the second protection switch 91.

  When receiving a test state transition command from the ECU 80, the power receiving side control unit 70 in the present embodiment turns on the first protection switch 90 and turns off the second protection switch 91 unlike the first embodiment (the first protection switch 91). 1 state). In the first state, the ECU 80 instructs the power receiving device 13 to transmit the test power from the power transmitting device 12 and determines whether the first protection switch 90 is abnormal. Thereafter, the ECU 80 transmits a second state transition command to the power receiving side control unit 70. When receiving the second state transition command from the ECU 80, the power receiving side control unit 70 turns off the first protection switch 90 and turns on the second protection switch 91 (second state). The ECU 80 performs abnormality determination of the second protection switch 91 in the second state. Transmission of test power is continued in the first state and the second state. The power transmission of the test power may be stopped after the abnormality determination of the first protection switch 90 is performed, and the power transmission of the test power may be resumed after the protection switches 90 and 91 are changed to the second state.

  FIG. 4 is a flowchart showing power transmission test processing in the present embodiment. This process is performed by the ECU 80 at a predetermined cycle while the vehicle is stopped. In the power transmission test process shown in FIG. 4, processes in steps S31 to S39 are performed instead of steps S19 to S21 in FIG. 2.

  When it is confirmed that the power receiving side control unit 70 has shifted to the abnormality determination state (S15: NO), it is determined in step S31 whether or not the abnormality determination of the first protection switch 90 has been performed. When the abnormality determination of the first protection switch 90 has not been performed (S31: YES), it is determined in step S32 whether or not the input voltage of the booster circuit 21 is equal to or lower than a predetermined value.

  If the input voltage of the booster circuit 21 is equal to or lower than the predetermined value (S32: YES), it is determined in step S33 that the first protection switch 90 is normal. Next, in step S <b> 34, a second state transition command is transmitted to the power receiving side control unit 70. If the input voltage of the booster circuit 21 is greater than the predetermined value (S32: NO), it is determined in step S35 that an abnormality has occurred in the first protection switch 90, and the process ends.

  When the abnormality determination of the first protection switch 90 has been completed (S31: NO), it is determined in step S36 whether or not the input voltage of the booster circuit 21 is equal to or lower than a predetermined value. When the input voltage of the booster circuit 21 is equal to or lower than the predetermined value (S36: YES), it is determined in step S37 that the second protection switch 91 is normal. Next, in step S38, the power transmission side control unit 60 and the power reception side control unit 70 are instructed to shift to the normal state, and the process ends. If the input voltage of the booster circuit 21 is greater than the predetermined value (S36: NO), it is determined in step S39 that an abnormality has occurred in the second protection switch 91, and the process ends.

  By performing the abnormality determination process in the second embodiment, it is possible to individually determine the open abnormality of the protection switches 90 and 91 in a configuration including a plurality of protection switches 90 and 91 as opening / closing means.

(Other embodiments)
In the abnormality determination of the opening / closing means, the determination is made based on the input side voltage of the booster circuit 21, but this may be changed. For example, a configuration may be adopted in which an abnormality of the opening / closing means is determined based on the detected value of the output side voltage of the booster circuit 21. In this case, the abnormality determination process may be performed after the main relays 53 and 54 are turned off. Moreover, it is good also as a structure which determines abnormality of an opening / closing means based on the detected value of the electric current which flows into the main relays 53 and 54.

  -As an opening-and-closing means, it is good also as a structure which provides three or more protection switches in parallel. In this case, it is preferable that one is a normally closed relay switch and the rest is a normally open semiconductor switch. Even if an abnormality occurs in the normally open semiconductor switch, the vehicle-mounted battery 14 can be charged by turning off the switch in which no abnormality has occurred, and the switch in which no abnormality has occurred is turned on. Fail safe processing is possible by setting the state.

  -It is good also as a structure which provides the protection switch 90 between the power receiving side filter circuit 22 and the rectifier circuit 20 like the non-contact electric power feeding system 10B shown in FIG. In other words, a path may be provided so that a closed circuit is formed by the power reception side resonance circuit 19 and the power reception side filter circuit 22, and the protection switch 90 may be provided on the path. Also in this configuration, by turning on the protection switch 90, the resonance frequency of the power reception side resonance circuit 19 is shifted from the resonance frequency of the power transmission side resonance circuit 17, and is supplied from the power transmission side resonance circuit 17 to the power reception side resonance circuit 19. Power can be suppressed.

  In the above embodiment, the power transmission side resonance circuit 17 and the power reception side resonance circuit 19 are configured to use parallel connection type resonance circuits in which the coils 37 and 38 and the capacitors 36 and 39 are connected in parallel. By changing this, a series connection type resonance circuit may be used as the power transmission side resonance circuit 17a and the power reception side resonance circuit 19a as in the non-contact power feeding system 10C shown in FIG. Specifically, the power transmission side capacitors 37 a and 36 b are respectively connected in series to both terminals of the power transmission side coil 37 to constitute the power transmission side resonance circuit 17 a, and the power reception side coils 38 are respectively connected to both terminals of the power reception side coil 38. The power receiving side resonance circuit 19a is configured by connecting 39a and 39b in series. Even when such a series connection type resonance circuit is used, by turning on the protection switch 90, the resonance frequency of the power reception side resonance circuit 19a is shifted from the resonance frequency of the power transmission side resonance circuit 17a. The power supplied from the side resonance circuit 17a to the power reception side resonance circuit 19a can be suppressed.

  In the above embodiment, the abnormality determination of the opening / closing means is performed before charging the in-vehicle battery 14, but this is changed and the abnormality determination of the opening / closing means is performed independently of the charging of the in-vehicle battery 14. It may be a configuration.

  Instead of the diode full bridge circuit using the diodes 44 to 47 as the rectifier circuit 20, a full bridge circuit using a semiconductor switch may be provided. In this case, the rectifier circuit has a function as an inverter circuit. Further, the step-down circuit 15 and the step-up circuit 21 may be changed to bidirectional DC / DC converters. In this configuration, power can be transmitted from the power reception device 13 to the power transmission device 12. For example, when power is supplied from the in-vehicle battery 14 to household electric appliances, it is conceivable to perform power transmission from the power receiving device 13 to the power transmitting device 12.

  And it is good to set it as the structure which provides the path | route which forms a closed circuit with the reactor 32 of the power transmission side filter circuit 18, and the power transmission side resonance circuit 17, and newly provides a protection switch on the path | route. In this case, power transmission from the power reception device 13 to the power transmission device 12 can be stopped by turning on a protection switch provided in the power transmission device 12 during power transmission from the power reception device 13 to the power transmission device 12. Furthermore, it may be configured to perform abnormality determination of the protection switch of the power transmission device 12 before power transmission from the power reception device 13 to the power transmission device 12.

  -Although it was set as the structure which uses the reactor and capacitor | condenser which were connected in series as the power receiving side filter circuit 22, this may be changed. For example, a configuration including only one reactor may be employed, and a configuration may be employed in which opening / closing means is provided on a path that connects the power receiving resonance circuit 19 and the reactor to form a closed circuit.

  DESCRIPTION OF SYMBOLS 17 ... Power transmission side resonance circuit, 19 ... Power reception side resonance circuit, 22 ... Power reception side filter circuit, 36 ... Power transmission side capacitor, 37 ... Power transmission side coil, 38 ... Power reception side coil, 39 ... Power reception side capacitor, 40, 41 ... Reactor 80 ... ECU, 90 ... protection switch.

Claims (7)

A power transmission side resonance circuit (17) including a power transmission side coil (37) and a power transmission side capacitor (36) and generating magnetic flux in the power transmission side coil by being supplied with AC power;
A power-receiving-side resonance circuit (19) that includes a power-receiving-side coil (38) and a power-receiving-side capacitor (39);
In the contactless power supply system (10) comprising:
A power receiving side filter circuit (22) provided on the output side of the power receiving side resonance circuit and provided with a reactor (40, 41);
Opening / closing means (90, 91) constituting a closed circuit including the power receiving side resonance circuit and the reactor;
Instructing that the opening / closing means is temporarily closed, and in that state, test power transmission execution means (80) for performing test power transmission from the power transmission side resonance circuit to the power reception side resonance circuit;
An abnormality determining means (80) for determining whether or not the opening / closing means is abnormal based on the power output from the power receiving side resonance circuit in a state where the test power transmission is performed by the test power transmission performing means;
Equipped with a,
As the opening / closing means, a plurality of switches (90, 91) connected in parallel are provided,
The test power transmission execution unit instructs each of the plurality of switches to close one switch and open the other switch, and perform the test power transmission by the power transmission side resonance circuit in that state. And
The abnormality determining means determines whether or not the opening / closing means is abnormal based on the power output from the power-receiving-side resonance circuit in a state where the test power transmission is performed for each switch. Contact power supply system. A power transmission side resonance circuit (17) including a power transmission side coil (37) and a power transmission side capacitor (36) and generating magnetic flux in the power transmission side coil by being supplied with AC power;
A power-receiving-side resonance circuit (19) that includes a power-receiving-side coil (38) and a power-receiving-side capacitor (39);
In the contactless power supply system (10) comprising:
A power receiving side filter circuit (22) provided on the output side of the power receiving side resonance circuit and provided with a reactor (40, 41);
Opening / closing means (90, 91) constituting a closed circuit including the power receiving side resonance circuit and the reactor;
Instructing that the opening / closing means is temporarily closed, and in that state, test power transmission execution means (80) for performing test power transmission from the power transmission side resonance circuit to the power reception side resonance circuit;
An abnormality determining means (80) for determining whether or not the opening / closing means is abnormal based on the power output from the power receiving side resonance circuit in a state where the test power transmission is performed by the test power transmission performing means;
With
The power receiving side filter circuit is two sets of LC filter circuits each connected to one and the other of a pair of output terminals of the power receiving side resonance circuit, and including a reactor (40, 41) and a capacitor (42, 43),
The non-contact power feeding system, wherein the opening / closing means forms a closed circuit with the power receiving side resonance circuit and one of the reactors. The power receiving side filter circuit is two sets of LC filter circuits each connected to one and the other of a pair of output terminals of the power receiving side resonance circuit, and including a reactor (40, 41) and a capacitor (42, 43),
The contactless power feeding system according to claim 1 , wherein the opening / closing means forms a closed circuit by the power receiving side resonance circuit and one of the reactors. Before performing normal power transmission from the power transmission side resonance circuit to the power reception side resonance circuit in response to a power supply request, test power transmission is performed by the test power transmission execution unit, and whether there is an abnormality in the opening / closing unit by the abnormality determination unit Make a decision,
Normal power transmission execution means (80) for performing normal power transmission from the power transmission side resonance circuit in a state where the opening / closing means is in an open state when the abnormality determination means determines that there is no abnormality in the opening / closing means; The non-contact electric power feeding system according to any one of claims 1 to 3 provided. The power receiving side resonance circuit is connected to a secondary battery (14),
The normal power transmission execution means is for charging the secondary battery by transmitting predetermined power from the power transmission side resonance circuit to the power reception side resonance circuit,
The non-contact power feeding system according to claim 4 , wherein transmission power by the test power transmission execution unit is smaller than transmission power by the normal power transmission execution unit. The contactless power supply system according to any one of claims 1 to 5 , further comprising a normally closed switch (90) as the opening / closing means. As the switching means, non-contact power supply system according to any one of claims 1 to 6, characterized in that it comprises a switch (91) of the normally open.

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