Power supply device

Abstract

A power supply device that transmits power in a non-contact manner comprises: a DC power source; a converter circuit 32 connected to the DC power source; a resonance circuit (33) connected to the converter circuit and including a power transmission coil (35); sensors (61-64) for detecting the value of current flowing through the circuits or the value of voltage applied to the circuits; and the control device is connected with the converter circuit and the sensor. The control device controls the converter circuit so as to convert a DC voltage supplied from the DC power source into an AC voltage and supply the AC voltage to the resonance circuit when causing the power supply device to transmit power in a non-contact manner. When diagnosing an abnormality of the sensor, the control device controls the converter circuit so as to supply a DC voltage supplied from the DC power source to the resonance circuit without converting the DC voltage into an AC voltage, and diagnoses the abnormality of the sensor on the basis of a detection value of the sensor at that time.

Description

Technical Field

[0001] The present disclosure relates to a power supply device. Background Art

[0002] A power supply device is known, which has a plurality of power transmission coils arranged along a lane for contactlessly transmitting power to a vehicle, and transmits power to a moving vehicle (Japanese Patent Laid-Open No. 2019-426219). Summary of the invention

[0003] In order to control the power supply device and calculate the power supply, the power supply device is provided with sensors for detecting the current and voltage flowing through the circuit. If these sensors are abnormal, the current and voltage cannot be accurately detected, and the power supply device cannot be properly controlled or the power supply cannot be calculated.

[0004] In view of the above-mentioned problems, an object of the present disclosure is to enable diagnosis of abnormality of a sensor provided in a power supply device.

[0005] The gist of the present disclosure is as follows.

[0006] (1) A power supply device that transmits power contactlessly, The power supply device comprises: a DC power supply; a converter circuit connected to the DC power supply; a resonant circuit connected to the converter circuit and including a power transmission coil; a sensor for detecting a current value flowing through these circuits or a voltage value applied to these circuits; and a control device connected to the converter circuit and the sensor. When the control device causes the power supply device to transmit power contactlessly, the control device controls the converter circuit to convert the DC voltage supplied from the DC power supply into an AC voltage and supply it to the resonant circuit. When the sensor abnormality is diagnosed, the control device controls the converter circuit to supply the DC voltage supplied from the DC power supply to the resonant circuit without converting it into an AC voltage, and diagnoses the abnormality of the sensor based on the detection value of the sensor at this time. (2) The power supply device described in (1) above, wherein: The control device diagnoses abnormality of the sensor based on a detection value of the sensor after ringing generated in the resonance circuit due to the supply of a direct current to the resonance circuit has converged. (3) The power supply device described in (1) or (2) above, wherein: The sensor comprises: a first sensor that detects a current value or a voltage value between the DC power supply and the converter circuit; and a second sensor that detects a current value or a voltage value between the converter circuit and the resonant circuit. When a DC voltage is supplied to the resonant circuit, if a current value or a voltage value detected by the first sensor is the same as a current value or a voltage value detected by the second sensor, the control device diagnoses that the first sensor and the second sensor are normal. (4) The power supply device described in (1) or (2) above, wherein: The sensor includes a sensor for detecting a current value or a voltage value between the converter circuit and the resonant circuit. When a current value or a voltage value detected by the sensor when a DC voltage is supplied to the resonance circuit is within a predetermined range set in advance, the control device determines that the sensor is normal. (5) The power supply device according to any one of (1) to (4) above, wherein: The sensor includes a current sensor for detecting a current value, The control device diagnoses abnormality of the current sensor based on a parameter related to ringing occurring in a current value detected by the current sensor when a DC voltage is supplied through the resonant circuit. (6) The power supply device according to any one of (1) to (5) above, wherein: The sensor includes a current sensor for detecting a current value, The control device controls the converter circuit to supply a predetermined AC voltage to the resonant circuit after the ringing generated in the resonant circuit converges due to the DC voltage being supplied to the resonant circuit, and diagnoses abnormality of the current sensor based on the detection value of the current sensor at this time. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a diagram schematically showing the configuration of a contactless power supply system including a ground power supply device. Figure 2 It is a diagram schematically showing the configuration of a converter circuit and a power transmission-side resonant circuit. Figure 3 The structure of the converter circuit and the power transmission side resonance circuit is schematically shown. Figure 2 Same picture. Figure 4 The structure of the converter circuit and the power transmission side resonance circuit is schematically shown. Figure 2 Same picture. Figure 5 This is a diagram for explaining the flow of current in the converter circuit and the power transmission-side resonance circuit during power transmission. Figure 6 The diagram schematically shows the state of the circuit when diagnosing abnormality of the sensor. Figure 7This is a graph showing the time variation of the current flowing through the circuit when the converter circuit is switched from the off mode to the DC mode. Figure 8 This is a graph showing the time variation of the voltage flowing through the circuit when the converter circuit switches from the off mode to the DC mode. Fig. 9 This is a flowchart showing the flow of a diagnostic process for diagnosing a sensor abnormality. Fig.10 This is a flowchart showing the flow of a diagnostic process for diagnosing a sensor abnormality. DETAILED DESCRIPTION

[0008] Hereinafter, the embodiment will be described in detail with reference to the drawings. In the following description, the same reference numerals are given to the same components.

[0009] First embodiment <Overview of the contactless power supply system> Figure 1 1 is a diagram schematically showing the configuration of a contactless power supply system 100 including a ground power supply device 1 according to the first embodiment. The contactless power supply system 100 includes a ground power supply device 1 and a vehicle 5 capable of receiving power from the ground power supply device 1. In the contactless power supply system 100, contactless power transmission using magnetic field resonance coupling (magnetic field resonance) is performed from the ground power supply device 1 to the vehicle 5. In this embodiment, contactless power transmission is performed not only when the vehicle 5 is parked, but also when the vehicle 5 is driving.

[0010] The ground power supply device 1 has a power transmission coil 35 configured to transmit power to the vehicle 5 in a non-contact manner, and the vehicle 5 has a power receiving coil 22 configured to receive power in a non-contact manner. If power is supplied to the power transmission coil 35 of the ground power supply device 1, a magnetic field is generated by the power transmission coil 35. When the power receiving coil 22 of the vehicle 5 is located on the power transmission coil 35, current flows through the power receiving coil 22 due to the magnetic field generated by the power transmission coil 35, and power is received by the power receiving coil 22.

[0011] <Vehicle Configuration> Next, refer to Figure 1 The structure of the vehicle 5 will be described. Figure 1 As shown, the vehicle 5 has a motor 11, a battery 12, a power control unit (PCU) 13, a power receiving unit 14, and an electronic control unit (ECU) 15. The vehicle 5 is an electric vehicle (BEV) in which the motor 11 drives the vehicle 5, or a hybrid vehicle (HEV) in which the motor 11 and an internal combustion engine drive the vehicle 5.

[0012] The motor 11 is, for example, an AC synchronous motor, and functions as a motor and a generator. The motor 11 functions as a motor and is driven using the electric power stored in the battery 12 as a power source. The output of the motor 11 is transmitted to the wheels via a speed reducer and an axle.

[0013] The battery 12 is composed of a rechargeable secondary battery, such as a lithium-ion battery, a nickel-metal hydride battery, etc. The battery 12 stores the power required for the vehicle 5 to travel (for example, the driving power of the motor 11). If the power received by the power receiving unit 14 is supplied to the battery 12, the battery 12 is charged. In addition, the battery 12 can also be charged by an external power source other than the ground power supply device 1 via a charging port provided in the vehicle 5.

[0014] The PCU 13 is electrically connected to the motor 11 and the battery 12. The PCU 13 includes a converter, a boost converter, and a DC / DC converter. The converter converts the DC power supplied from the battery 12 into AC power, and supplies the AC power to the motor 11. When the power stored in the battery 12 is supplied to the motor 11, the boost converter boosts the voltage of the battery 12 as needed. When the power stored in the battery 12 is supplied to electronic devices such as headlights, the DC / DC converter steps down the voltage of the battery 12.

[0015] The power receiving unit 14 receives electric power from the power transmission coil 35 and supplies the received electric power to the battery 12. The power receiving unit 14 includes a power receiving side resonance circuit 21, a power receiving side rectification circuit 24, and a charging circuit 25.

[0016] The receiving-side resonant circuit 21 is arranged at the bottom of the vehicle 5 so that the distance from the road surface is small. The receiving-side resonant circuit 21 includes a receiving coil 22 and a receiving-side resonant capacitor 23. The receiving coil 22 is arranged so that a current flows through the receiving coil 22 after a magnetic field is generated around it. The receiving coil 22 and the receiving-side resonant capacitor 23 constitute a resonator. Various parameters of the receiving coil 22 and the receiving-side resonant capacitor 23 (the outer diameter and inner diameter of the receiving coil 22, the number of turns of the receiving coil 22, the capacitance of the receiving-side resonant capacitor 23, etc.) are determined so that the resonant frequency of the receiving-side resonant circuit 21 coincides with the resonant frequency of the transmitting-side resonant circuit 33. In addition, if the deviation between the resonant frequency of the receiving-side resonant circuit 21 and the resonant frequency of the transmitting-side resonant circuit 33 is small, for example, the resonant frequency of the receiving-side resonant circuit 21 is within the range of ±10% of the resonant frequency of the transmitting-side resonant circuit 33, the resonant frequency of the receiving-side resonant circuit 21 does not necessarily have to be consistent with the resonant frequency of the transmitting-side resonant circuit 33.

[0017] The receiving-side rectifier circuit 24 is electrically connected to the receiving-side resonance circuit 21 and the charging circuit 25. The receiving-side rectifier circuit 24 rectifies the AC power supplied from the receiving-side resonance circuit 21 and converts it into DC power, and supplies the DC power to the charging circuit 25. The receiving-side rectifier circuit 24 is, for example, an AC / DC converter.

[0018] The charging circuit 25 is electrically connected to the power receiving side rectifier circuit 24 and the battery 12. The charging circuit 25 converts the DC power supplied from the power receiving side rectifier circuit 24 into the voltage level of the battery 12 and supplies it to the battery 12. When the power transmitted from the power transmission coil 35 is supplied to the battery 12 through the power receiving unit 14, the battery 12 is charged. The charging circuit 25 is, for example, a DC / DC converter.

[0019] The ECU 15 performs various controls on the vehicle 5. For example, the ECU 15 is electrically connected to the charging circuit 25 of the power receiving unit 14, and controls the charging circuit 25 to control charging of the battery 12 by the power transmitted from the power transmission coil 35. In addition, the ECU 15 is electrically connected to the PCU 13, and controls the PCU 13 to control reception / transmission of power between the battery 12 and the motor 11.

[0020] <Configuration of ground power supply equipment> Next, refer to Figure 1 The structure of the ground power supply device 1 is briefly described. Figure 1 As shown, the ground power supply device 1 includes a power source 2, a power transmission side rectifier circuit 31, a converter circuit 32, a power transmission side resonant circuit 33, and a controller 34. In this embodiment, one ground power supply device 1 includes, for example, a plurality of power transmission coils 35 buried in a row on a roadway.

[0021] The power supply 2 supplies power to the power transmission side resonance circuit 33 via the power transmission side rectification circuit 31 and the converter circuit 32. The power supply 2 is, for example, a commercial AC power supply that supplies single-phase AC power. In addition, the power supply 2 may also be another AC power supply that supplies three-phase AC power, or may be a DC power supply such as a fuel cell.

[0022] The power transmission side rectifier circuit 31 is electrically connected to the power supply 2 and the converter circuit 32. The power transmission side rectifier circuit 2 rectifies the AC power supplied from the power supply 31 and converts it into DC power, and supplies the DC power to the converter circuit 32. The power transmission side rectifier circuit 31 is, for example, an AC / DC converter. In the present embodiment, a power transmission side rectifier circuit 31 is provided in one ground power supply device 1. Since the power transmission side rectifier circuit 31 supplies DC power to the converter circuit 32, in the present embodiment, the power supply 2 and the power transmission side rectifier circuit 31 function as a DC power supply. In addition, when the power supply 2 is a DC power supply, the power transmission side rectifier circuit 31 may be omitted. In addition, the power transmission side rectifier circuit 31 may be buried underground or may be provided above ground.

[0023] The converter circuit 32 is electrically connected to the power transmission side rectification circuit 31 and the power transmission side resonance circuit 33. The converter circuit 32 converts the DC power supplied from the power transmission side rectification circuit 2 into AC power (high-frequency AC power) having a frequency higher than the AC power of the power source 2, and supplies the high-frequency AC power to the power transmission side resonance circuit 33. In the present embodiment, one ground power supply device 1 has a number of converter circuits 32 corresponding to the number of power transmission coils 35. Each converter circuit 32 is connected to a corresponding one of the different power transmission side resonance circuits 33. For the specific circuit configuration of the converter circuit 32, refer to Figure 2 This will be described later. In addition, the converter circuit 32 may be buried underground or installed above ground.

[0024] The power transmission side resonance circuit 33 is connected to the converter circuit 32. A plurality of them are provided in one ground power supply device 1. Each power transmission side resonance circuit 33 includes a power transmission coil 35 and a power transmission side resonance capacitor 36. In each power transmission side resonance circuit 33, when high frequency power is supplied from the converter circuit 32, an alternating magnetic field is generated in the power transmission coil 35. The power transmission coil 35 and the power transmission side resonance capacitor 36 constitute a resonator. Various parameters of the power transmission coil 35 and the power transmission side resonance capacitor 36 (the outer diameter and inner diameter of the power transmission coil 35, the number of turns of the power transmission coil 35, the capacitance of the power transmission side resonance capacitor 36, etc.) are determined so that the resonance frequency of the power transmission side resonance circuit 33 becomes a predetermined set value. The predetermined set value is, for example, 10 kHz to 100 GHz, and preferably 85 kHz determined according to the SAE TIR J2954 standard as a frequency band for contactless power transmission. In addition, in the present embodiment, all the power transmission side resonance circuits 33 are configured so that the various parameters of the power transmission coil 35 and the power transmission side resonance capacitor 36 are the same as each other. In other words, all the power-transmitting-side resonant circuits 33 have the same configuration.

[0025] The controller 34 is, for example, a general-purpose computer, and performs various controls on the ground power supply device 1. In particular, the controller 34 functions as a control device for controlling the power supply device. For example, the controller 34 is electrically connected to the converter circuit 32, and controls the converter circuit 32 in order to control the power transmission through the power transmission coil 35. Specifically, for example, the controller 34 determines the power transmission coil 35 on which the vehicle 5 is located based on the detection value of an arbitrary sensor (not shown), and controls the converter circuit 32 in a manner that supplies power to the determined power transmission coil 35. The controller 34 has a processor that performs various processes, a memory that stores programs for causing the processor to perform various processes, and various data used by the processor when performing various processes.

[0026] The power transmission coil 35 and the power transmission side resonance capacitor 36 of the power transmission side resonance circuit 33 are buried underground. In particular, the power transmission coil 35 is arranged with its center located in the center of the charging section. Alternatively, the power transmission coil 35 is arranged with its center located in the center of the lane.

[0027] In the contactless power supply system 100 configured as described above, Figure 1 When the power receiving coil 22 of the vehicle 5 is facing the power transmission coil 35 of the ground power supply device 1, AC power is supplied to the power transmission side resonance circuit 33, and an alternating magnetic field is generated by the power transmission coil 35. After the alternating magnetic field is generated in this way, the vibration of the alternating magnetic field is transmitted to the power receiving coil 22. As a result, an induced current flows in the power receiving coil 22 due to electromagnetic induction, and an induced electromotive force is generated in the power receiving side resonance circuit 21 by the induced current. That is, power is transmitted from the power transmission side resonance circuit 33 to the power receiving unit 14 including the power receiving side resonance circuit 21.

[0028] <Circuit Description> Next, refer to Figure 2 , a circuit including the converter circuit 32 and the power transmission side resonance circuit 33 is described. Figure 2 2 is a diagram schematically showing the configuration of the converter circuit 32 and the power transmission side resonance circuit 33 .

[0029] like Figure 2 As shown, the converter circuit 32 has four switching transistors 41 to 44 , a smoothing capacitor 45 , and a first normal mode choke coil 46 .

[0030] The four switching transistors 41 to 44 form an H-bridge circuit. The first switching transistor 41 is connected in series with the third switching transistor 43, and the second switching transistor 42 is connected in series with the fourth switching transistor 44. The two sets of switching transistors 41 to 44 connected in series are connected to a positive line 47 connected to the positive electrode of the power transmission side rectifier circuit 31 and a negative line 48 connected to the negative electrode of the power transmission side rectifier circuit 31.

[0031] Specifically, the first switching transistor 41 and the second switching transistor 42 are connected to the positive line 47. On the other hand, the third switching transistor 43 and the fourth switching transistor 44 are connected to the negative line 48. In addition, the first switching transistor 41 and the second switching transistor 42 are connected to the first output terminal 49 of the converter circuit 32. On the other hand, the third switching transistor 43 and the fourth switching transistor 44 are connected to the second output terminal 50 of the converter circuit 32. Therefore, the first switching transistor 41 is provided between the positive line 47 and the first output terminal 49, and the second switching transistor 42 is provided between the positive line 47 and the second output terminal 50. In addition, the third switching transistor 43 is provided between the negative line 48 and the first output terminal 49, and the fourth switching transistor 44 is provided between the negative line 48 and the second output terminal 50. These switching transistors 41 to 44 are connected to the controller 34, and the controller 34 controls the on / off state.

[0032] The smoothing capacitor 45 is provided between the positive electrode line 47 and the negative electrode line 48. The smoothing capacitor 45 is used to smooth the current rectified by the power transmission side rectifier circuit 31.

[0033] The first normal mode choke coil 46 is connected in series to the positive line 47 and the negative line 48, respectively. In particular, the first normal mode choke coil 46 is connected to the positive line 47 and the negative line 48, respectively, on the power transmission side rectifier circuit 31 side relative to the switching transistors 41 to 44 and the smoothing capacitor 45. The first normal mode choke coil 46 can reduce the normal mode noise generated in the converter circuit 32 and the power transmission side resonant circuit 33.

[0034] In addition, in order to reduce noise, other filter elements may be provided in the converter circuit 32. For example, an X capacitor or a Y capacitor may be provided between the positive line 47 and the negative line 48. Alternatively, a common mode choke coil may be provided in which a conductor connected in series with the positive line 47 and a conductor connected in series with the negative line 48 are wound around a core material. Alternatively, no filter element may be provided in the converter circuit 32.

[0035] As described above, the power transmission side resonance circuit 33 includes the power transmission coil 35 and the power transmission side resonance capacitor 36. Furthermore, the power transmission side resonance circuit 33 includes the second normal mode choke coil 51 and the X capacitor 52.

[0036] One end of the power transmission coil 35 is connected to a first line 53 connected to the first output terminal 49 of the converter circuit 32. In addition, the other end of the power transmission coil 35 is connected to a second line 54 connected to the second output terminal 50 of the converter circuit 32. Therefore, the first output terminal 49 of the converter circuit 32 is connected to one end of the power transmission coil 35. On the other hand, the second output terminal 50 of the converter circuit 32 is connected to the other end of the power transmission coil 35.

[0037] In addition, in the present embodiment, two power transmission side resonant capacitors 36 are respectively connected in series with the first line 53 and the second line 54. In addition, the power transmission side resonant capacitor 36 can be provided in any manner as long as it forms a resonator together with the power transmission coil 35. Therefore, the power transmission side resonant capacitor 36 can be connected in series with only one of the first line 53 and the second line 54, or can be connected in parallel with the power transmission coil 35 between the first line 53 and the second line 54.

[0038] The second normal mode choke coil 51 is connected in series with the first line 53 and the second line 54. In particular, the second normal mode choke coil 51 is connected to the first line 53 and the second line 54 between the output terminals 49 and 50 of the converter circuit 32 and the X capacitor 52. The second normal mode choke coil 51 can reduce the normal mode noise generated in the power transmission side resonance circuit 33.

[0039] The X capacitor 52 is a capacitor provided between the first line 53 and the second line 54. The X capacitor 52 can reduce the normal mode noise generated in the resonant circuit 33 on the power transmission side.

[0040] Furthermore, in order to reduce noise, other filter elements may be provided in the power transmission side resonance circuit 33. For example, a Y capacitor may be provided between the first wire 53 and the second wire 54. Alternatively, a common mode choke coil may be provided in which a conductor connected in series with the first wire 53 and a conductor connected in series with the second wire 54 are wound around a core material. Alternatively, no filter element may be provided in the power transmission side resonance circuit 33. In addition, the filter element (filter circuit) is not limited to an admittance transformation filter, but may be in other circuit forms. For example, the filter circuit may be as follows: Figure 3 The fourth-order filter 55 shown, Figure 4 The bandpass filter 56 shown, etc.

[0041] In addition, the ground power supply device 1 of the present embodiment further includes sensors 61 to 64, which detect the current flowing through the converter circuit 32 and the power transmission side resonance circuit 33, and the voltage applied to the converter circuit 32 and the power transmission side resonance circuit 33. These sensors 61 to 64 are connected to the controller 34, and transmit the detection results to the controller 34.

[0042] The first current sensor 61 is provided on the positive line 47 between the power transmission side rectifier circuit 31 and the converter circuit 32. The first current sensor 61 detects the value of the current flowing through the positive line 47. In addition, the first current sensor 61 only needs to be connected in series with the positive line 47, and may be provided at other positions such as between the switching transistors 41, 42 and the first normal mode choke coil 46. Alternatively, the first current sensor 61 may also be provided on the negative line 48.

[0043] The second current sensor 62 is provided on the first line 53 between the converter circuit 32 and the power transmission side resonance circuit 33. The second current sensor 62 detects the value of the current flowing through the first line 53. In addition, the second current sensor 62 only needs to be connected in series with the first line 53, and may be provided at other positions such as between the power transmission coil 35 and the second normal mode choke coil 51. Alternatively, the second current sensor 62 may also be provided on the negative line 48.

[0044] The first voltage sensor 63 is provided between the positive line 47 and the negative line 48 between the power transmission side rectifier circuit 31 and the converter circuit 32. The first voltage sensor 63 detects the voltage value between the positive line 47 and the negative line 48. In addition, the first voltage sensor 63 only needs to be located between the positive line 47 and the negative line 48 and connected thereto, and may also be provided at other positions such as between the switching transistors 41, 42 and the first normal mode choke coil 46.

[0045] The second voltage sensor 64 is provided between the first line 53 and the second line 54 between the converter circuit 32 and the power transmission side resonance circuit 33. The second voltage sensor 64 detects the voltage value between the first line 53 and the second line 54. In addition, the second voltage sensor 64 only needs to be located between the first line 53 and the second line 54 and connected thereto, and may also be provided at other positions such as between the power transmission coil 35 and the second normal mode choke coil 51.

[0046] In addition, in the ground power supply device 1 of the present embodiment, four sensors 61 to 64 for detecting current or voltage are provided. Of course, it is sufficient as long as at least any one of these sensors is provided in the ground power supply device 1. In addition, the first current sensor 61, the second current sensor 62, the first voltage sensor 63, and the second voltage sensor 64 can also be provided in plurality. In this case, each sensor is arranged at a different position. For example, one of the plurality of second current sensors 62 is arranged on the first line 53 between the first output terminal 49 of the converter circuit 32 and the second normal mode choke coil 51, and another second current sensor 62 is arranged on the first line 53 between the power transmission coil 35 and the power transmission side resonant capacitor 36.

[0047] <Operation during power transmission> Next, refer to Figure 5 , the flow of current in the converter circuit 32 and the power-transmission-side resonant circuit 33 during power transmission will be described. Figure 5 It is a diagram for explaining the flow of current in the converter circuit 32 and the power-transmission-side resonance circuit 33 during power transmission.

[0048] During power transmission, the switching transistors 41 to 44 of the converter circuit 32 are selectively connected to output AC power from the output terminals 49 and 50 of the converter circuit 32. Specifically, in the converter circuit 32, the first connection state and the second connection state are alternately repeated intermittently to output AC power.

[0049] like Figure 5 As shown in (A), in the first connection state, the first switch transistor 41 and the fourth switch transistor 44 are turned on, and the second switch transistor 42 and the third switch transistor 43 are turned off. In this case, the positive line 47 is connected to the first output terminal 49, thereby connected to the first line 53. On the other hand, the negative line 48 is connected to the second output terminal 50, thereby connected to the second line 54.

[0050] In addition, in the second connection state, if Figure 5 As shown in (B), the second switching transistor 42 and the third switching transistor 43 are turned on, and the first switching transistor 41 and the fourth switching transistor 44 are turned off. In this case, the positive line 47 is connected to the second output terminal 50, thereby connected to the second line 54. On the other hand, the negative line 48 is connected to the first output terminal 49, thereby connected to the first line 53.

[0051] When transmitting power, the first connection state and the second connection state as described above are intermittently and repeatedly alternately in the converter circuit 32, thereby outputting, for example, 85kHz AC power from the output terminals 49 and 50 of the converter circuit 32. When the AC power is output from the converter circuit 32 in this way, the AC power is supplied to the power transmission side resonance circuit 33, and as a result, an alternating magnetic field is generated in the power transmission coil 35. That is, in the present embodiment, when the controller 34 causes the ground power supply device 1 to transmit power contactlessly, it controls the converter circuit 32 to convert the DC voltage supplied from the power transmission side rectification circuit 31 into an AC voltage and supply it to the power transmission side resonance circuit 33.

[0052] <Detection of sensor abnormality> As described above, the ground power supply device 1 is provided with sensors 61 to 64 for detecting current values ​​or voltage values. The detection values ​​of these sensors 61 to 64 are input to the controller 34. The controller 34 controls the converter circuit 32 (controls the switching transistors 41 to 44), calculates the amount of power supplied by the ground power supply device 1, etc. based on the current values ​​or voltage values ​​detected by the sensors 61 to 64. Therefore, if an abnormality occurs in the sensors 61 to 64, the sensors 61 to 64 become unable to detect a value corresponding to the actual current or voltage, and the converter circuit 32 cannot be properly controlled, and the amount of power supplied by the ground power supply device 1 cannot be properly calculated. Therefore, in the present embodiment, abnormality diagnosis of the sensors 61 to 64 is performed.

[0053] Reference Figure 6 to Figure 9 , abnormality diagnosis of sensors 61 to 64 will be described. Figure 6 It is a diagram schematically showing the state of the circuit when abnormality diagnosis of the sensors 61 to 64 is performed.

[0054] like Figure 6 As shown in (A), when abnormality diagnosis is performed, first, all switching transistors 41 to 44 of the converter circuit 32 are turned off. As a result, no current flows in the converter circuit 32 and the power transmission side resonance circuit 33, and the current values ​​detected by the first current sensor 61 and the second current sensor 62 are zero.

[0055] Then, if Figure 6 As shown in (B), the first switching transistor 41 and the fourth switching transistor 44 of the converter circuit 32 are turned on and maintained in this state. Furthermore, the second switching transistor 42 and the third switching transistor 43 are turned off and maintained in this state. As a result, a DC current flows through the power transmission side resonance circuit 33. That is, in this embodiment, when performing abnormal diagnosis of the sensors 61 to 64, the converter circuit 32 is controlled so that the DC voltage supplied from the power transmission side rectifier circuit 31 is not converted into an AC voltage and is supplied to the power transmission side resonance circuit 33.

[0056] In addition, at this time, the power supply 2 or the power transmission side rectifier circuit 31 may be controlled so that their output voltage becomes a voltage lower than that when power is transmitted. Figure 6 Unlike the example shown in (B), the converter circuit 32 turns on the second switching transistor 42 and the third switching transistor 43 and turns off the first switching transistor 41 and the fourth switching transistor 44.

[0057] In the converter circuit 32 from Figure 6 The state shown in (A) (disconnect mode) switches to Figure 6 After the state shown in (B) (DC mode), ringing occurs in the converter circuit 32 and the power transmission side resonance circuit 33.

[0058] Figure 7 3 is a diagram showing the temporal change in the current flowing through the circuit when the converter circuit 32 is switched from the off mode to the DC mode. Figure 7 For example, the time-dependent change of the current value detected by the first current sensor 61 or the second current sensor 62 is shown. In particular, Figure 7 1 and 2 show changes in the case where the converter circuit 32 is switched from the off mode to the DC mode at time t0.

[0059] like Figure 7As shown in FIG. 1 , before the converter circuit 32 is switched at time t0, the converter circuit 32 is in the off mode, so no current flows in the circuit. When the converter circuit 32 is switched to the DC mode at time t0, a DC current is supplied to the power transmission side resonance circuit 33, causing ringing, and the current value detected by the first current sensor 61 or the second current sensor 62 fluctuates up and down. Such ringing occurs because the converter circuit 32 and the power transmission side resonance circuit 33 include a coil and a capacitor.

[0060] If the voltage of the DC power supplied from the power transmission side rectifier circuit 31 is the same, the ringing that occurs in this way has the same waveform. Figure 7 The current value detected by the first current sensor 61 or the second current sensor 62 shown has the same waveform every time the converter circuit 32 is switched to the DC mode. Therefore, for example, after the converter circuit 32 is switched to the DC mode, the first positive side peak value Ipd1 and the first negative side peak value Ipd2 of the current value detected by the first current sensor 61 or the second current sensor 62 become substantially the same design values ​​corresponding to the voltage of the DC power every time.

[0061] Thereafter, when the converter circuit 32 is maintained in the DC mode and the DC current is continuously supplied to the power transmission side resonance circuit 33, as shown in FIG. Figure 7 As shown in FIG. 1 , this ringing converges at time t1. In the power transmission side resonance circuit 33 of the present embodiment, the power transmission side resonance capacitor 36 is connected in series with the first line 53, the second line 54, and the power transmission coil 35. Therefore, when the charge corresponding to the voltage of the power transmission side rectifier circuit 31 is accumulated in the power transmission side resonance capacitor 36, no current flows in the power transmission side resonance circuit 33. Therefore, as Figure 7 As shown, in the present embodiment, the current value detected by the first current sensor 61 or the second current sensor 62 converges to substantially zero.

[0062] Figure 8 3 is a diagram showing the temporal change in the voltage flowing through the circuit when the converter circuit 32 is switched from the off mode to the DC mode. Figure 8 For example, a temporal change in a voltage value detected by the first voltage sensor 63 or the second voltage sensor 64 is shown. Figure 8 Also shown are changes in the case where the converter circuit 32 is switched from the disconnection mode to the DC mode at time t0 .

[0063] like Figure 8 As shown in FIG. 1 , after time t0, the voltage value detected by the first voltage sensor 63 or the second voltage sensor 64 fluctuates up and down due to ringing. Thereafter, when the converter circuit 32 is maintained in the DC mode and the DC voltage is continuously supplied to the power transmission side resonance circuit 33, as shown in FIG. Figure 8As shown, the ringing converges at time t1. Therefore, after time t1, the first voltage sensor 63 and the second voltage sensor 64 detect the same constant voltage value. In particular, the voltage values ​​detected by the first voltage sensor 63 and the second voltage sensor 64 at this time become the design values ​​corresponding to the voltage of the DC power.

[0064] Here, consider the case where the first current sensor 61 or the second current sensor 62 is abnormal and cannot detect the accurate current value. In such a case, the first positive side peak value Ipd1 and the first negative side peak value Ipd2 detected after the converter circuit 32 switches to the DC mode become values ​​different from the design values. Therefore, in the present embodiment, based on whether the first positive side peak value Ipd1 is within a predetermined range near the design value, the first current sensor 61 or the second current sensor 62 is diagnosed to be abnormal. In addition, in the present embodiment, based on whether the first negative side peak value Ipd2 is within a predetermined range near the design value, the first current sensor 61 or the second current sensor 62 is diagnosed to be abnormal. In addition, the predetermined range is, for example, ± a few percent or more than ten percent of the design value.

[0065] Furthermore, when an abnormality occurs in the first voltage sensor 63 or the second voltage sensor 64, the converter circuit 32 is switched to the DC mode, and after the ringing converges, the first voltage sensor 63 and the second voltage sensor 64 detect different voltage values. Therefore, in the present embodiment, after the ringing converges, the presence or absence of an abnormality in the first voltage sensor 63 and the second voltage sensor 64 is diagnosed based on whether the voltage values ​​detected by the first voltage sensor 63 and the second voltage sensor 64 are the same. That is, in the present embodiment, the abnormality of the voltage sensors 63 and 64 is diagnosed based on the detection values ​​of the voltage sensors 63 and 63 after the ringing converges. Specifically, when the voltage values ​​detected by the first voltage sensor 63 and the second voltage sensor 64 are the same after the ringing converges, the controller 34 determines that these sensors 63 and 64 are normal. On the other hand, when the voltage values ​​detected by the first voltage sensor 63 and the second voltage sensor 64 are different from each other, the controller 34 determines that one of these sensors 63 and 64 is abnormal. In addition, in addition to the case where the difference between the two voltages is zero, the two voltages are also determined to be the same when they are within 1% or within a few percent.

[0066] In particular, after the above-mentioned ringing converges, the detected voltage values ​​of the voltage sensors 63 and 64 that have not generated an abnormality become substantially the same design values ​​corresponding to the voltage of the DC power. Therefore, in the present embodiment, when the voltage values ​​detected by the first voltage sensor 63 and the second voltage sensor 64 are different from each other, the controller 34 determines that the voltage sensor that has detected a value that deviates from the design value has an abnormality.

[0067] As described above, in the present embodiment, based on the detection values ​​of the sensors 61 to 64 when the converter circuit 32 is controlled in the DC mode, the abnormality of the sensors 61 to 64 is diagnosed. Thus, it is possible to diagnose the abnormality of the sensors 61 to 64 provided in the ground power supply device 1. In particular, by controlling the converter circuit 32 in the DC mode, it is not necessary to add any components for the abnormality diagnosis of the sensors 61 to 64, and the abnormality of the sensors 61 to 64 can be diagnosed at a low cost.

[0068] Fig. 9 1 is a flowchart showing the flow of a diagnostic process for diagnosing abnormalities of the sensors 61 to 64. The diagnostic process shown in the figure is executed by the controller 34 at an arbitrary timing (for example, at fixed time intervals).

[0069] like Fig. 9 As shown, in the abnormality diagnosis of the sensors 61 to 64, the controller 34 first switches the converter circuit 32 from the disconnection mode to the DC mode (step S11). Then, the controller 34 obtains the peak value Ipd (e.g., the first positive side peak value Ipd1, the first negative side peak value Ipd2) of the current value detected by the first current sensor 61 or the second current sensor 62 (step S12).

[0070] Next, the controller 34 determines whether the peak value Ipd obtained in step S12 is within a prescribed range α near the corresponding set value Irefd (step S13). Thus, for example, the controller 34 determines whether the difference between the peak value Ipd1 of the first positive side and the first set value Irefd1 corresponding to the peak value of the first positive side is within the prescribed range α. In the case where it is determined in step S13 that the peak value Ipd is within the prescribed range near the set value Irefd, the controller 34 determines that the first current sensor 61 or the second current sensor 62 is normal (step S14). On the other hand, in the case where it is determined in step S13 that the peak value Ipd is not within the prescribed range near the set value Irefd, the controller 34 determines that an abnormality has occurred in the first current sensor 61 or the second current sensor 62 (step S15).

[0071] After that, the controller 34 determines whether the current value detected by the first current sensor 61 or the second current sensor 62 has converged (step S16). For example, if the detected current value has converged within a specified current width after a specified time, it is determined that the current value has converged. In step S16, if it is determined that the detected current value has not converged, step S16 is repeated.

[0072] On the other hand, when it is determined in step S16 that the detected current value converges, it is determined whether the voltage value V1 detected by the first voltage sensor 63 and the voltage value V2 detected by the second voltage sensor 64 are the same (step S17). When it is determined in step S17 that the detected voltage value V1 of the first voltage sensor 63 and the detected voltage value V2 of the second voltage sensor 64 are the same, the controller 34 determines that both the first voltage sensor 63 and the second voltage sensor 64 are normal (step S18). On the other hand, when it is determined in step S18 that the detected voltage value V1 of the first voltage sensor 63 and the detected voltage value V2 of the second voltage sensor 64 are different, the controller 34 determines that one of the first voltage sensor 63 and the second voltage sensor 64 is abnormal (step S19). In particular, in the present embodiment, the controller 34 determines that the voltage sensors 63 and 64 that detect values ​​that deviate from the design values ​​among the detected voltage value V1 of the first voltage sensor 63 and the detected voltage value V2 of the second voltage sensor 64 are abnormal.

[0073] Then, the controller 34 switches the converter circuit 32 from the DC mode to the OFF mode (step S20 ). The diagnosis process is thus terminated.

[0074] <Modification> Furthermore, in the above-described embodiment, the abnormality diagnosis of the current sensors 61 and 62 is performed based on the first positive side peak value Ipd1 and the first negative side peak value Ipd2. However, the abnormality diagnosis may be performed based on the second and subsequent positive side and negative side peak values. In addition, the abnormality diagnosis of the current sensors 61 and 62 may be performed based on parameters other than the peak value related to the ringing, such as the rising speed of the current immediately after the converter circuit 32 is switched to the DC mode.

[0075] In addition, in the above-mentioned embodiment, the abnormality diagnosis of the voltage sensors 63 and 64 is performed based on whether the detected voltage values ​​of the two voltage sensors 63 and 64 are the same after the ringing converges. However, the abnormality diagnosis of the current sensors 61 and 62 may be performed based on whether the detected current values ​​of the two current sensors 61 and 62 are the same after the ringing converges. However, in this case, in order to distinguish from the case where the abnormality occurs in the current sensors 61 and 62 and the detected current value does not change from zero, it may be assumed that the current sensors 61 and 62 detect the change of the current value accompanied by the ringing.

[0076] In addition, in the above-mentioned embodiment, when the converter circuit 32 is set to the DC mode, the abnormality diagnosis of the voltage sensors 63 and 64 is performed based on whether the detected voltage values ​​of the two voltage sensors 63 and 64 are the same after the ringing converges. However, when the converter circuit 32 is set to the DC mode, it is also possible to determine whether the voltage sensors 63 and 64 have abnormalities based on whether the detected voltage values ​​of each voltage sensor 63 and 64 are within a predetermined range near the design value after the ringing converges. Similarly, when the converter circuit 32 is set to the DC mode, it is also possible to determine whether the current sensors 61 and 62 have abnormalities based on whether the detected voltage values ​​of each current sensor 61 and 62 are within a predetermined range near the design value (zero in this embodiment) after the ringing converges.

[0077] In addition, in the above-mentioned embodiment, two current sensors 61, 62 and two voltage sensors 63, 64 are provided. However, only one current sensor and one voltage sensor may be provided. In this case, for example, the second current sensor 62 and the second voltage sensor 64 are provided between the converter circuit 32 and the power transmission side resonance circuit 33, and the first current sensor 61 and the first voltage sensor 63 are omitted. In addition, in the above-mentioned embodiment, both the current sensors 61, 62 and the voltage sensors 63, 64 are provided in the ground power supply device 1, but only one of these components (for example, only the current sensors 61, 62) may be provided.

[0078] In the above embodiment, the converter circuit 32 is switched from the OFF mode to the DC mode during the abnormality diagnosis of the sensors 61 to 64. However, the abnormality diagnosis of the sensors 61 to 64 may be performed when the converter circuit 32 is switched from a mode other than the OFF mode to the DC mode.

[0079] Second embodiment Next, refer to Fig.10, a ground power supply device 1 according to a second embodiment is described. The configuration and control of the ground power supply device 1 according to the second embodiment are basically the same as those of the ground power supply device 1 according to the first embodiment. The following description will focus on the parts that are different from the ground power supply device according to the first embodiment.

[0080] In the ground power supply device 1 involved in the first embodiment, the abnormality of the current sensors 61 and 62 is diagnosed based on the parameter (peak value) related to the ringing. However, in this embodiment, after the converter circuit 32 is maintained in the DC mode until the ringing converges, the converter circuit 32 is switched to the AC mode, and the abnormality of the current sensor 61 is diagnosed based on the detection values ​​of the current sensors 61 and 62 at this time.

[0081] Specifically, in this embodiment, the converter circuit 32 is maintained in the DC mode until the ringing converges (until Figure 7 Then, similarly to the first embodiment, abnormality diagnosis of the voltage sensors 63 and 64 is performed based on the detected voltage values ​​of the first voltage sensor 63 and the second voltage sensor 64 immediately after the ringing has converged.

[0082] Then, in this embodiment, the converter circuit 32 is switched to the AC mode. In the AC mode, as shown in FIG. Figure 5 As described, the first connection state and the second connection state are intermittently alternated and repeated, and AC power of, for example, 85kHz is output from the output terminals 49 and 50 of the converter circuit 32. Thus, the controller 34 controls the converter circuit 32 to supply a preset AC voltage to the power transmission side resonance circuit 33. However, at this time, the converter circuit 32 or the power transmission side rectifier circuit 31 is controlled so that the output power becomes lower than when power is transmitted. Specifically, the output power is reduced by lengthening the disconnection time in the first connection state, the second connection state, or between them in the converter circuit 32. Alternatively, the output power is reduced by reducing the output voltage of the power transmission side rectifier circuit 31. At this time, the converter circuit 32 or the power transmission side rectifier circuit 31 is controlled based on the detection voltage value of the first voltage sensor 63 and the second voltage sensor 64.

[0083] Furthermore, in the present embodiment, based on the detection values ​​of the current sensors 61 and 62 when the converter circuit 32 is set to the AC mode, abnormality diagnosis of these current sensors 61 and 62 is performed. For example, based on whether the peak value of the positive side or the negative side of the detected current value of the current sensors 61 and 62 that have changed is within a preset range near the design value, abnormality diagnosis of the current sensors is performed. Specifically, when the peak value of the positive side or the negative side of the detected current value of the current sensors 61 and 62 is within the preset range, it is determined that the current sensors 61 and 62 are normal. On the other hand, when the peak value of the positive side or the negative side of the detected current value of the current sensors 61 and 62 is not within the preset range, it is determined that the current sensors are abnormal.

[0084] According to the present embodiment, after the abnormality diagnosis of the voltage sensors 63 and 64 is completed, the converter circuit 32 or the power transmission side rectifier circuit 31 is controlled based on the detection values ​​of the voltage sensors 63 and 64. Therefore, since the abnormality diagnosis of the voltage sensors 63 and 64 has been completed, the converter circuit 32 or the power transmission side rectifier circuit 31 is appropriately controlled based on the detection values ​​of these voltage sensors 63 and 64. Therefore, the abnormality diagnosis of the current sensors 61 and 62 can also be appropriately performed.

[0085] In addition, in the present embodiment, abnormality diagnosis is performed based on the peak value of the detected current value of the current sensors 61 and 62 when the converter circuit 32 is set to the AC mode. However, abnormality diagnosis of the current sensors 61 and 62 may be performed based on parameters other than the peak value related to the AC current, such as the maximum rising speed of the detected current value of the current sensors 61 and 62. In addition, in the present embodiment, abnormality diagnosis of the current sensors 61 and 62 may be performed based on parameters related to ringing, as in the first embodiment.

[0086] Fig.10 61 to 64. The illustrated diagnostic process is executed by the controller 34 at an arbitrary timing (for example, at fixed intervals). Fig.10 Steps S31 to S35 and Fig. 9 Steps S11 and S16 to S19 are the same, and thus description thereof is omitted. In addition, in the present embodiment, when it is determined that the voltage sensors 63 and 64 are abnormal (step S35), the abnormality determination of the current sensor is skipped (steps S36 to S40).

[0087] like Fig.10As shown, after the abnormal diagnosis of the voltage sensor is completed, the controller 34 switches the converter circuit 32 from the DC mode to the AC mode (step S36). Next, the controller 34 obtains the peak value Ipa of the current value detected by the first current sensor 61 or the second current sensor 62 (step S37). Thereafter, the controller 34 determines whether the peak value Ipa obtained in step S34 is within a prescribed range β near the corresponding set value Irefa (step S38). In the case where it is determined in step S38 that the peak value Ipa is within the prescribed range near the set value Irefa, the controller 34 determines that the first current sensor 61 or the second current sensor 62 is normal (step S39). On the other hand, in the case where it is determined in step S38 that the peak value Ipa is not within the prescribed range near the set value Irefa, the controller 34 determines that an abnormality has occurred in the first current sensor 61 or the second current sensor 62 (step S40).

[0088] Then, the controller 34 switches the converter circuit 32 from the DC mode to the disconnection mode (step S41 ). Thus, the diagnosis process ends.

[0089] As mentioned above, although the preferred embodiment concerning this invention was described, this invention is not limited to these embodiments, Various corrections and changes can be implemented within the description of the scope of claims. [Explanation of Reference Numerals]

[0090] 1 Ground power supply device 5 Vehicles 14 Power receiving unit 31 Transmission side rectifier circuit 32 Converter circuit 33 Transmission side resonance circuit 34 Controller 35 Power transmission coil 61, 62 Current sensor 63, 64 voltage sensor.

Claims

1. A power supply device that transmits power contactlessly, The power supply device comprises: a DC power supply; a converter circuit connected to the DC power supply; a resonant circuit connected to the converter circuit and including a power transmission coil; a sensor for detecting a current value flowing through these circuits or a voltage value applied to these circuits; and a control device connected to the converter circuit and the sensor. When the control device causes the power supply device to transmit power contactlessly, the control device controls the converter circuit to convert the DC voltage supplied from the DC power supply into an AC voltage and supply it to the resonant circuit. When diagnosing abnormality of the sensor, the control device controls the converter circuit to supply the DC voltage supplied from the DC power supply to the resonant circuit without converting it into an AC voltage, and diagnoses the abnormality of the sensor based on the detection value of the sensor at this time.

2. The power supply device according to claim 1, wherein: The control device diagnoses abnormality of the sensor based on a detection value of the sensor after ringing generated in the resonance circuit due to the supply of a direct current to the resonance circuit has converged.

3. The power supply device according to claim 1 or 2, wherein: The sensor comprises: a first sensor that detects a current value or a voltage value between the DC power supply and the converter circuit; and a second sensor that detects a current value or a voltage value between the converter circuit and the resonant circuit, When a DC voltage is supplied to the resonant circuit, if a current value or a voltage value detected by the first sensor is the same as a current value or a voltage value detected by the second sensor, the control device diagnoses that the first sensor and the second sensor are normal.

4. The power supply device according to claim 1 or 2, wherein: The sensor includes a sensor for detecting a current value or a voltage value between the converter circuit and the resonant circuit. When a current value or a voltage value detected by the sensor when a DC voltage is supplied to the resonance circuit is within a predetermined range set in advance, the control device determines that the sensor is normal.

5. The power supply device according to any one of claims 1 to 4, wherein: The sensor includes a current sensor for detecting a current value, The control device diagnoses abnormality of the current sensor based on a parameter related to ringing occurring in a current value detected by the current sensor when a DC voltage is supplied through the resonant circuit.

6. The power supply device according to any one of claims 1 to 5, wherein: The sensor includes a current sensor for detecting a current value, The control device controls the converter circuit to supply a predetermined AC voltage to the resonant circuit after the ringing generated in the resonant circuit converges due to the DC voltage being supplied to the resonant circuit, and diagnoses abnormality of the current sensor based on the detection value of the current sensor at this time.

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