Non-contact power supply device

Abstract

To early determine a failure of a non-contact power supply device.SOLUTION: A non-contact power supply device includes: a power transmission resonance circuit 42; a switching circuit 44; and a unit controller 46 that controls the switching circuit. The unit controller performs at least one of a first anomaly determination processing for determining whether the non-contact power supply device is anomalous or not by using a first detection value detected by a detection unit in a non-resonance state and a second anomaly determination process for determining whether the non-contact power supply device is anomalous or not by using a second detection value detected by the detection unit in a resonant state.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 discloses a technique for determining that a contactless power supply device has a malfunction when an induced current flowing through a power receiving coil that receives power supplied contactlessly from the contactless power supply device is equal to or smaller than a first threshold value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-76657 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is inconvenient if a fault is discovered when trying to receive power and power cannot be received, so there is a demand for technology that can determine faults at an early stage. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] According to one embodiment of the present disclosure, there is provided a non-contact power supply device (10) that non-contactly supplies power to a power receiving device (80) having a secondary coil (L2). The non-contact power supply device includes a power transmitting resonant circuit (42, 442, 542) having a primary coil (L1) that can be magnetically coupled to the secondary coil and a primary capacitor (C1), an AC power source (11) that supplies AC power of a predetermined operating frequency to the power transmitting resonant circuit, a switching circuit (44) for switching the state of the power transmitting resonant circuit between a resonant state and a non-resonant state, a detection unit (51) for directly or indirectly detecting a current value of a current flowing through the primary coil, and a unit control unit (46) that controls the switching circuit. The unit control unit performs at least one of a first abnormality judgment process for determining whether or not the non-contact power supply device is abnormal using a first detection value detected by the detection unit in the non-resonant state, and a second abnormality judgment process for determining whether or not the non-contact power supply device is abnormal using a second detection value detected by the detection unit in the resonant state.In the first abnormality judgment process, a first judgment step is performed for determining whether or not the first detection value is outside a predetermined first reference range, and a first abnormality judgment step is performed for determining that the non-contact power supply device is abnormal if it is determined in the first judgment step that the first detection value is outside the first reference range.In the second abnormality judgment process, a second judgment step is performed for determining whether or not the second detection value is outside a predetermined second reference range, and a second abnormality judgment step is performed for determining that the non-contact power supply device is abnormal if it is determined in the second judgment step that the second detection value is outside the second reference range.

[0007] According to this aspect, the non-contact power supply device can determine an abnormality by performing at least one of the first abnormality determination process and the second abnormality determination process, thereby making it possible to determine a failure of the non-contact power supply device at an early stage. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram of a non-contact power supply system according to a first embodiment. [Diagram 2] FIG. 1 is a circuit diagram of a contactless power supply system according to a first embodiment. [Diagram 3] 4 is a flowchart of a power supply sequence. [Figure 4] 4 is a flowchart of an abnormality detection process according to the first embodiment. [Diagram 5] FIG. 11 is a circuit diagram of a non-contact power supply system according to a second embodiment. [Figure 6] 13 is a first correspondence table between failures and changes in detection values ​​according to the second embodiment. [Figure 7] 13 is a second correspondence table between failures and changes in detection values ​​according to the second embodiment. [Figure 8] 13A to 13C are diagrams showing current values ​​of each coil in normal conditions according to the second embodiment; [Figure 9] 10 is a flowchart of an abnormality detection process according to the second embodiment. [Figure 10] FIG. 11 is a circuit diagram of a non-contact power supply device according to a third embodiment. [Figure 11] 13A to 13C are diagrams showing current values ​​of each coil in normal states according to the third embodiment. [Figure 12] 13 is a first correspondence table between failures and changes in detection values ​​according to the third embodiment. [Figure 13] 13 is a second correspondence table between failures and changes in detection values ​​according to the third embodiment. [Figure 14] 13 is a third correspondence table between failures and changes in detection values ​​according to the third embodiment. [Figure 15] 13 is a flowchart of the first half of an abnormality detection process according to the third embodiment. [Figure 16] 13 is a flowchart of the second half of the abnormality detection process according to the third embodiment. [Figure 17] FIG. 11 is a circuit diagram of a non-contact power supply device according to a fourth embodiment. [Figure 18] 13 is a first correspondence table between failures and changes in detection values ​​according to the fourth embodiment. [Figure 19] 13 is a second correspondence table between failures and changes in detection values ​​in the fourth embodiment. [Figure 20] FIG. 13 is a circuit diagram of a non-contact power supply device according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A. First embodiment: A1. Configuration of the wireless power supply system: As shown in FIG. 1, the contactless power supply system 1 includes a contactless power supply device 10 and a power receiving device 80. In this embodiment, the contactless power supply device 10 is buried under a road RS. The power receiving device 80 is mounted on a vehicle VE as a moving body that travels on the road RS. When the vehicle VE is traveling, power is supplied to the power receiving device 80 from the contactless power supply device 10. Here, traveling includes a case where the vehicle VE is moving and a case where the vehicle is stopped, such as waiting at a traffic light. The vehicle VE is configured as, for example, an electric vehicle or a hybrid vehicle.

[0010] The contactless power supply device 10 includes a power transmission unit 40 having a power transmission coil L1 as a primary coil, and an AC power source 11 that supplies power to the power transmission unit 40. The AC power source 11 supplies AC power at a predetermined operating frequency to the multiple power transmission units 40. In detail, the AC power source 11 includes a DC power source that converts AC power supplied from a system power source into DC power, and a DC / AC conversion device that converts the DC power supplied from the DC power source into AC power at the operating frequency. The multiple power transmission coils L1 are arranged along the extension direction of the road RS.

[0011] The moving body on which the power receiving device 80 is mounted is not limited to a vehicle VE traveling on the road RS, and may be, for example, an AGV (automated guided vehicle) or a traveling robot. The power transmitting unit 40 may be installed not under the road RS, but on a sidewalk or parking lot adjacent to the road RS, or on a route along which the AGV travels. A configuration in which one power transmitting unit 40 is connected to the AC power source 11 may also be used.

[0012] The power receiving device 80 includes a battery 84 as a load device, a power receiving resonant circuit 81 having a power receiving coil L2 as a secondary coil, and a power receiving side control unit 96. The power receiving coil L2 can be magnetically coupled to the power transmitting coil L1. In this embodiment, the power receiving coil L2 is provided on the underside of the vehicle VE, facing the power transmitting coil L1.

[0013] The electric power received by the power receiving coil L2 is supplied to the battery 84. The battery 84 is a secondary battery that is charged by the supplied DC power. The electric power charged in the battery 84 is used as a driving force for traveling, etc.

[0014] The power receiving side control unit 96 controls each unit such as the power receiving resonant circuit 81 in the power receiving device 80. The power receiving side control unit 96 is realized by including an ECU (engine control unit). Note that the ECU may be realized by one microcontroller or may be realized by including multiple microcontrollers.

[0015] A2.Circuit configuration of the non-contact power supply system: 2, the power transmitting unit 40 has a power transmitting resonant circuit 42, a switching circuit 44, and a unit control unit 46 in addition to the above configuration. The power transmitting resonant circuit 42 has a power transmitting coil L1, a power transmitting capacitor C1 as a primary capacitor, and a first switch SW1. The power transmitting capacitor C1 has a function of putting the power transmitting resonant circuit 42 in a resonant state at the operating frequency and putting the power transmitting resonant circuit 42 in a non-resonant state at the operating frequency. The power transmitting capacitor C1 includes a first power transmitting capacitor C11 and a second power transmitting capacitor C12.

[0016] The switching circuit 44 switches the state of the power transmission resonant circuit 42 between a resonant state and a non-resonant state. The unit control unit 46 controls the switching circuit 44. The unit control unit 46 is realized by, for example, a microcontroller. A program for an abnormality detection process, which will be described later, is stored in the memory of the unit control unit 46.

[0017] The first power transmitting capacitor C11 is connected in series with the power transmitting coil L1. The second power transmitting capacitor C12 is connected in series with the first switch SW1. The connection between the second power transmitting capacitor C12 and the first switch SW1 is connected in parallel with the first power transmitting capacitor C11. The first switch SW1 is a bidirectional switch to which the source terminals of two FETs (Field effect transistors) are connected. A switching signal Sig1 output from a switching circuit 44 is input to the gate terminals of the two FETs. This controls the on / off state of the first switch SW1.

[0018] When a high-level switching signal Sig1 is input to the first switch SW1, the first switch SW1 is turned on, i.e., in a conductive state, and a current flows through the second power transmitting capacitor C12. Here, the combined capacitance of the first power transmitting capacitor C11 and the second power transmitting capacitor C12 and the inductance of the power transmitting coil L1 are set to values ​​that provide a resonant state at the operating frequency when the power transmitting coil L1 and the power receiving coil L2 are magnetically coupled. As a result, when the first switch SW1 is turned on, the power transmitting resonant circuit 42 is in a resonant state by the first power transmitting capacitor C11, the second power transmitting capacitor C12, and the power transmitting coil L1. On the other hand, when a low-level switching signal Sig1 is input to the first switch SW1, the first switch SW1 is turned off, i.e., in a non-conductive state. Then, the resonant frequency of the resonant circuit formed by the first power transmitting capacitor C11 and the power transmitting coil L1 deviates from the operating frequency, and the power transmitting resonant circuit 42 is in a non-resonant state.

[0019] The power transmitting unit 40 further includes a first current sensor 51 serving as a detection unit for directly or indirectly detecting a current value of a current flowing through the power transmitting coil L1, and a magnetic sensor 52. In the present embodiment, the first current sensor 51 directly detects a current value of a current flowing through the power transmitting coil L1, and transmits a signal indicating the detected current value to the unit control unit 46.

[0020] Here, indirect detection of the current value of the current flowing through the power transmitting coil L1 specifically means detection of the voltage value of the power transmitting coil L1, the magnetic flux density near the power transmitting coil L1, or the voltage of the first power transmitting capacitor C11, for example. The larger the current value of the current flowing through the power transmitting coil L1, the larger the voltage value of the power transmitting coil L1. Therefore, the voltage value of the power transmitting coil L1 can be converted into the current value of the current flowing through the power transmitting coil L1. The larger the current value of the current flowing through the power transmitting coil L1, the larger the current density near the power transmitting coil L1. Therefore, the magnetic flux density near the power transmitting coil L1 can be converted into the current value of the current flowing through the power transmitting coil L1. Therefore, in order to detect the current value of the power transmitting coil L1, that is, as a detection unit, a voltage sensor that detects the voltage value of the power transmitting coil L1 or a magnetic sensor that detects the magnetic flux density near the power transmitting coil L1 may be used instead of the first current sensor 51.

[0021] The magnetic sensor 52 incorporates a detection coil Lsp. The detection coil Lsp is disposed in the vicinity of the power transmitting coil L1. The magnetic sensor 52 detects the magnetic flux density in the vicinity of the power transmitting coil L1, and transmits a detection value indicating the detected magnetic flux density to the unit control unit 46. In this embodiment, the magnetic sensor 52 incorporates a voltage sensor that detects a voltage induced in the detection coil Lsp. The greater the magnetic flux density to be detected, the greater the voltage value detected by the magnetic sensor 52.

[0022] The power receiving device 80 has a power receiving resonant circuit 81 which is a series resonant circuit having a power receiving coil L2 and a power receiving capacitor C2.

[0023] A3. Power supply sequence: The power transmitting coils L1 are arranged in the direction in which the road RS extends, and the power receiving coil L2 receives power from the nearest power transmitting coil L1 in a non-contact manner. The power transmitting unit 40 is set to either a standby state or a power supplying state. Specifically, when the power transmitting unit 40 is set to the standby state, the unit control unit 46 commands the switching circuit 44 to set the first switch SW1 to an off state and set the power transmitting resonant circuit 42 to a non-resonant state. On the other hand, when the power supplying state is set, the unit control unit 46 commands the switching circuit 44 to set the first switch SW1 to an on state and set the power transmitting resonant circuit 42 to a resonant state. The standby current flowing through the power transmitting coil L1 in the standby state is smaller than the power supplying current flowing through the power transmitting coil L1 in the power supplying state.

[0024] The power transmission unit 40 is set to a standby state at startup. When the power transmission unit 40 detects the approach of the power receiving coil L2, the power transmission unit 40 switches from the standby state to a power supply state and supplies power to the power receiving coil L2. A power supply sequence showing the details of switching between the standby state and the power supply state will be described with reference to FIG. 3.

[0025] The power transmission unit 40 is set to a standby state at the time of startup. In the standby state, the power transmission unit 40 causes a standby current to flow through the power transmission coil L1, thereby generating magnetic flux from the power transmission coil L1. When the power receiving coil L2 approaches the power transmission coil L1, the power receiving device 80 detects the magnetic flux generated by the power transmission coil L1 using a secondary side detection circuit (not shown). When the power receiving device 80 detects the magnetic flux generated by the power transmission coil L1, it generates a starting magnetic flux. Specifically, the power receiving device 80 applies AC power to a magnetic flux generating coil (not shown). This causes the magnetic flux generating coil to generate magnetic flux. The generated magnetic flux increases the detection value of the magnetic sensor 52, and becomes larger than a predetermined reference value.

[0026] When the detection value of the magnetic sensor 52 is greater than a first reference value, the unit control unit 46 determines that the power receiving coil L2 is located near the power transmitting coil L1. On the other hand, when the detection value of the magnetic sensor 52 is equal to or less than a second reference value, the unit control unit 46 determines that the power receiving coil L2 is not located near the power transmitting coil L1. The first reference value and the second reference value may be the same value or different values. In the following description, a case where the unit control unit 46 determines that the power receiving coil L2 is located near the power transmitting coil L1 may be simply described as "when the power receiving coil L2 approaches." A case where the unit control unit 46 determines that the power receiving coil L2 is not located near the power transmitting coil L1 may be simply described as "when the power receiving coil L2 is removed."

[0027] 3, when the unit control unit 46 determines that the power receiving coil L2 is located near the power transmitting coil L1, the unit control unit 46 sets the power transmitting resonant circuit 42 to a resonant state in step S3. Specifically, the unit control unit 46 commands the switching circuit 44 to switch the first switch SW1 from an off state to an on state using a switching signal Sig1. When the power transmitting coil L1 and the power receiving coil L2 are magnetically coupled, the resonant frequency of the power transmitting resonant circuit 42 and the resonant frequency of the power receiving resonant circuit 81 are set to be substantially the same. This allows contactless power supply to the power receiving coil L2 by magnetic field resonant coupling between the power transmitting coil L1 and the power receiving coil L2.

[0028] In step S5, the unit control unit 46 determines that the power receiving coil L2 is not located near the power transmitting coil L1, and sets the power transmitting resonant circuit 42 to a non-resonant state. Specifically, the unit control unit 46 commands the switching circuit 44 to switch the first switch SW1 from the on state to the off state using the switching signal Sig1. As a result, power supply is stopped, and the power transmitting unit 40 is set to a standby state.

[0029] A4. Anomaly detection process: After the power transmission unit 40 is started, the unit control unit 46 starts the abnormality detection process shown in FIG. 4. In step S10, the unit control unit 46 judges whether or not the power receiving device 80 is present within the position range where power can be supplied. Specifically, when the detection value of the magnetic sensor 52 is equal to or less than a predetermined first reference value, the unit control unit 46 judges that the power receiving device 80 is not present within the range where power can be supplied. In contrast, when the detection value of the magnetic sensor 52 is greater than the first reference value, the unit control unit 46 judges that the power receiving device 80 is present within the range where power can be supplied. The judgment of whether or not an abnormality has occurred is performed in a state where the power receiving coil L2 is not present within the position range where power can be supplied. Therefore, in step S10, when it is judged that the power receiving device 80 is present within the position range where power can be supplied, the unit control unit 46 repeatedly executes step S10 until it is judged that the power receiving device 80 is not present.

[0030] If it is determined in step S10 that no power receiving device 80 is present within the range to which power can be supplied, then in step S14, the unit control unit 46 acquires the detection value of the first current sensor 51. Note that since the state of the power transmitting unit 40 has not been changed from the non-resonant state, the detection value of the first current sensor 51 acquired in step S14 is, in other words, the detection value in the non-resonant state.

[0031] In step S20, the unit control unit 46 determines whether the acquired current value is outside a predetermined reference range. Specifically, the reference range is a range equal to or less than a predetermined reference value. If the acquired current value is greater than the reference value, the unit control unit 46 determines that the current value is outside the reference range. On the other hand, if the acquired detection value is equal to or less than the reference value, the unit control unit 46 determines that the current value is not outside the reference range, i.e., is within the reference range.

[0032] Since the power transmission unit 40 is set to a standby state, a standby current flows through the power transmission coil L1 during normal operation when the power transmission resonant circuit 42 is not faulty. Therefore, when the current flowing through the power transmission coil L1 is larger than that during normal operation, it can be determined that the power transmission resonant circuit 42 is faulty. Specifically, the fault in this case may be a short-circuit fault of the first switch SW1 or a short-circuit fault of the first power transmission capacitor C11. Here, a short-circuit fault is a fault that results in a constant conductive state. Since such a fault may cause unnecessary generation of magnetic flux from the power transmission coil L1, it is preferable to detect it early.

[0033] The reference value used in step S20 is a value larger than the standby current in a normal state, and is determined in advance through experiments or the like.

[0034] If it is determined in step S20 that the detected value is not outside the reference range, the unit control unit 46 determines in step S22 that the power transmission unit 40 is normal, and sets the power supply permitted state. The power supply permitted state is a state in which a power supply sequence can be executed. On the other hand, if it is determined in step S20 that the detected value is outside the reference range, the unit control unit 46 determines in step S24 that the power transmission unit 40 is abnormal, and sets the power supply prohibited state. The power supply prohibited state is a state in which a power supply sequence cannot be executed. In the power supply prohibited state, the power transmission unit 40 is always set to a standby state. The unit control unit 46 ends this processing sequence after executing step S22 and after executing step S24.

[0035] In step S14, the detection value acquired by unit control section 46 is also referred to as a first detection value. Step S20 is also referred to as a first determination step. Step S24 is also referred to as a first abnormality determination step. Steps S20 and S24 are collectively referred to as a first abnormality determination process.

[0036] According to the first embodiment described above, the unit control unit 46 acquires the detection value in the non-resonant state in step S14, and determines whether the detection value is outside a reference range in step S20, thereby determining whether the non-contact power supply device 10 is abnormal, i.e., whether it has a malfunction. Therefore, it is possible to determine in advance whether the non-contact power supply device 10 has a malfunction at a time different from the power supply operation, and to determine a malfunction of the non-contact power supply device 10 at an early stage.

[0037] Furthermore, the unit control unit 46 performs an abnormality detection process at the time of startup, i.e., after startup, before switching from the standby state to the power supply state. This makes it possible to avoid switching from the standby state to the power supply state when the contactless power supply device 10 is broken.

[0038] B. Second embodiment: 5, the contactless power supply device 210 according to this embodiment differs from the first embodiment in that it includes a power transmission control device 60, in the circuit configuration of the power transmission unit 240, and in the processing content of the abnormality detection processing. The same configurations and processing steps as those in the first embodiment are denoted by the same reference numerals, and detailed explanations will be omitted as appropriate.

[0039] B1.Circuit configuration of the non-contact power supply system: As shown in FIG. 5, the power transmission unit 240 has a coupling circuit 48. The coupling circuit 48 is used to form or cut off a power transmission path between the power transmission unit 240 and the power receiving device 80. The coupling circuit 48 has a tertiary coil L3, a tertiary capacitor C3, and a second switch SW2. The tertiary capacitor C3 and the second switch SW2 are connected in parallel to the tertiary coil L3. The second switch SW2 is a bidirectional switch similar to the first switch SW1. The tertiary coil L3 is disposed at a position where it can be magnetically coupled to the power transmission coil L1. As a result, when the power transmission coil L1 and the power receiving coil L2 are magnetically coupled to each other, the power transmission coil L1, the power receiving coil L2, and the tertiary coil L3 are magnetically coupled to each other.

[0040] The capacitance value of the tertiary capacitor C3 is set to a value that causes the parallel resonant circuit formed by the tertiary coil L3 and the tertiary capacitor C3 to enter a resonant state when the transmitting coil L1, the receiving coil L2, and the tertiary coil L3 are magnetically coupled to each other.

[0041] The power receiving device 80 is mounted on a moving body as in the first embodiment, and when the power receiving coil L2 approaches the power transmitting coil L1, the unit control unit 46 switches the power transmitting resonant circuit 42 and the coupling circuit 48 from a non-resonant state to a resonant state, and switches the power transmitting unit 40 from a standby state to a power supplying state. Specifically, as described above, the switching circuit 44 switches the first switch SW1 from an off state to an on state, and switches the second switch SW2 from an on state to an off state. When the second switch SW2 is switched to the off state, the parallel resonant circuit formed by the tertiary coil L3 and the tertiary capacitor C3 enters a resonant state. As a result, a power supply current flows through the power transmitting coil L1, and power is supplied contactlessly to the power receiving coil L2.

[0042] On the other hand, when the power receiving coil L2 is detached, the unit control unit 46 switches the power transmitting resonant circuit 42 and the coupling circuit 48 from a resonant state to a non-resonant state, and switches the power transmitting unit 40 from a power supply state to a standby state. Specifically, as described above, the switching circuit 44 switches the first switch SW1 from an on state to an off state, and switches the second switch SW2 from an off state to an on state. When the second switch SW2 is switched to the on state, both terminals of the tertiary coil L3 are short-circuited, and the coupling circuit 48 is in a non-resonant state. As a result, the power transmitting unit 40 is switched to a standby state in which a standby current smaller than the power supply current flows through the power transmitting coil L1.

[0043] The power transmitting coils L1 are arranged in an array, and the power receiving coil L2 is supplied with power from the nearest power transmitting coil L1 among the arranged power transmitting coils L1. That is, the arranged power transmitting coils L1 are switched from the standby state to the power supplying state in order of arrangement. For this reason, a magnetic flux generated by the power transmitting coil L1 of the power transmitting unit 40 set to the power supplying state may penetrate the power transmitting coil L1 of the adjacent power transmitting unit 40 set to the standby state. Here, since the coupling circuit 48 is set to the non-resonant state, the standby current flowing through the power transmitting coil L1 can be reduced.

[0044] Furthermore, in the standby state, the coupling circuit 48 also functions as a magnetic sensor for detecting the approach of the power receiving coil L2. In the standby state, since the second switch SW2 is set to the on state, the current induced in the tertiary coil L3 flows through the second switch SW2 in the conductive state. The current flowing through the tertiary coil L3 can be detected by the second current sensor 54 described later. In the first embodiment, the magnetic sensor 52 is used in step S1 of FIG. 3 in the power supply sequence. In contrast, in the present embodiment, the approach of the power receiving coil L2 in the power supply sequence is performed using the second current sensor 54. The removal of the power receiving coil L2 in the power supply sequence is performed using the first current sensor 51. In this embodiment, the approach and removal of the power receiving coil L2 may be performed using the magnetic sensor 52, as in the first embodiment. As described later, the detection value of the second current sensor 54 is used for the abnormality detection process. That is, the second current sensor 54 for detecting the approach of the power receiving coil L2 can be used for the abnormality detection process. Therefore, the abnormality detection process can be performed without adding a new sensor.

[0045] The power transmission unit 240 includes a voltage sensor 53 and a second current sensor 54 in addition to the first current sensor 51 and the magnetic sensor 52. The voltage sensor 53 detects the voltage value of the second power transmission capacitor C12 and transmits a signal indicating the detected voltage value to the unit control unit 46. The second current sensor 54 directly detects the current value of the current flowing through the tertiary coil L3 and transmits a signal indicating the detected current value to the unit control unit 46. In this embodiment, in addition to the first current sensor 51, the voltage sensor 53, the second current sensor 54, and the magnetic sensor 52 are used in the abnormality detection process. The current value detected by the first current sensor 51, the voltage value detected by the magnetic sensor 52, the voltage value detected by the voltage sensor 53, and the current value detected by the second current sensor 54 are collectively referred to as detection values.

[0046] The power transmission control device 60 is capable of communicating with each power transmitting unit 240. Specifically, the power transmission control device 60 is capable of communicating with the unit control unit 46. The power transmission control device 60 is realized by including, for example, a microcontroller.

[0047] B2. Overview of abnormality detection process: 6 and 7 are tables summarizing the fault locations and the changes in each detection value. The change in detection value, in detail, indicates the change in the detection value when an abnormality occurs relative to the detection value when normal. In the table, "increase" indicates that the detection value when an abnormality occurs due to a fault is larger relative to the normal state when no fault occurs. In the table, "decrease" indicates that the detection value is smaller relative to the normal state. In the table, "-" indicates that there is no change relative to the normal state or the amount of change is small. In addition, "I(L1)" in the table indicates the current value of the first current sensor 51. "I(L3)" in the table indicates the current value of the second current sensor 54. "V(C12)" in the table indicates the voltage value of the voltage sensor 53. "φ(L1)" in the table indicates the magnetic flux density indicated by the voltage value of the magnetic sensor 52.

[0048] In this embodiment, since the coupling circuit 48 is included in addition to the power transmitting resonant circuit 42, the standby state and power feeding state of the power transmitting unit 240 will be used in the description, instead of the resonant state and non-resonant state of the power transmitting resonant circuit 42. Note that the correspondence between the resonant state and non-resonant state of the power transmitting resonant circuit 42 and the coupling circuit 48, respectively, and the standby state and power feeding state of the power transmitting unit 240 is as described above.

[0049] In the standby state, both the power transmitting resonant circuit 42 and the coupling circuit 48 are set to a non-resonant state. Therefore, as shown in FIG. 8, both the current flowing through the power transmitting coil L1 and the current flowing through the tertiary coil L3 are small. In the power supply state, both the power transmitting resonant circuit 42 and the coupling circuit 48 are set to a resonant state. Even in a normal state, the current value flowing through the power transmitting coil L1 and the current value flowing through the tertiary coil L3 are different. In addition, the current value of the power transmitting coil L1 in the standby state is different from the current value in the power supply state. Therefore, the reference value used in the abnormality detection process is set for each combination of each detection value and each state of the standby state and the power supply state.

[0050] The following describes an example of changes in detection values ​​when the first switch SW1 has a short-circuit fault and there is no fault in the circuit elements other than the first switch SW1. As shown in Fig. 6, when the first switch SW1 has a short-circuit fault, in the standby state, the current value of the first current sensor 51, the voltage value of the voltage sensor 53, the current value of the second current sensor 54, and the detection value of the magnetic sensor 52 all increase compared to the normal state.

[0051] In the standby state, the first switch SW1 is set to the off state, so that in the normal state, as described above, a standby current smaller than that in the power supply state flows through the power transmission coil L1. However, when the first switch SW1 has a short-circuit failure, the state of the power transmission resonant circuit 42 becomes substantially the same as the power supply state, so that a current equivalent to the power supply current flows through the power transmission coil L1, and the detection value of the first current sensor 51 increases. Then, as the current flowing through the power transmission coil L1 increases, the current flowing through the magnetically coupled tertiary coil L3 also increases. Therefore, the detection value of the second current sensor 54 increases. As the current flowing through the second power transmission capacitor C12 connected in series with the power transmission coil L1 also increases, the detection value of the voltage sensor 53 also increases. As the current flowing through the power transmission coil L1 increases, the current flowing through the magnetically coupled detection coil Lsp also increases. Therefore, the detection value of the magnetic sensor 52 also increases.

[0052] On the other hand, in the power supply state, even if the first switch SW1 has a short-circuit failure, the detection value does not fluctuate significantly because in the power supply state, the first switch SW1 is set to the on state, and there is no significant difference from when the first switch SW1 has a short-circuit failure.

[0053] When the first switch SW1 has an open circuit failure, in the power supply state, the state of the power transmitting resonant circuit 42 becomes substantially the same as the standby state in the normal state, so that the current value of the first current sensor 51, the voltage value of the voltage sensor 53, the current value of the second current sensor 54, and the magnetic flux density of the magnetic sensor 52 all decrease compared to the normal state. On the other hand, when the first switch SW1 has an open circuit failure, in the standby state, the first switch SW1 is set to the off state, so there is no significant difference from the case where the first switch SW1 has an open circuit failure.

[0054] As described above, by using the detection values ​​in the power supply state in addition to the standby state, it is possible to detect faults that cannot be detected in the standby state alone. Furthermore, by comparing the changes in the detection values ​​in the standby state with the changes in the detection values ​​in the power supply state, it is possible to identify a faulty circuit element and a fault mode such as a short circuit fault or an open circuit fault.

[0055] "Decrease in C" in Figure 6 indicates a decrease in the capacitance value of the capacitor. "Increase in L" in Figure 7 indicates an increase in the inductance of the coil. "Decrease in L" in Figure 7 indicates a decrease in the inductance of the coil. "Foreign matter (metal, etc.)" and "Foreign matter (magnetic material, etc.)" in Figure 7 will be discussed later.

[0056] B3. Details of abnormality judgment process: 9, when the unit control unit 46 determines in step S10 that the power receiving device 80 is not present within the positional range where power can be supplied, the process proceeds to step S14. When the power receiving coil L2 is present within the positional range where the power transmitting coil L1 can be magnetically coupled, the value of the current flowing through the power transmitting coil L1 varies depending on the degree of coupling between the power transmitting coil L1 and the power receiving coil L2. Thus, when it is determined that the power receiving device 80 is not present within the positional range where power can be supplied, the unit control unit 46 determines whether or not there is an abnormality, thereby enabling accurate determination of whether or not there is an abnormality.

[0057] In step S14, the unit control unit 46 acquires each detection value in the standby state and stores the acquired detection value in the built-in memory. Here, the detection values ​​indicate the current value of the first current sensor 51, the voltage value of the voltage sensor 53, the current value of the second current sensor 54, and the voltage value of the magnetic sensor 52. In step S16, the unit control unit 46 sets the power transmitting unit 240 to a power supplying state. In step S18, the unit control unit 46 acquires each detection value and stores the acquired detection value in the built-in memory.

[0058] In step S20, it is determined whether the detection value in the standby state is outside a first reference range. The first reference range is a reference range for determining whether the detection value in the standby state is abnormal. In contrast, the second reference range in the next step S21 is a reference range for determining whether the detection value in the power supply state is abnormal. The first reference range and the second reference range are collectively referred to as the reference range.

[0059] Specifically, step S20 is performed by comparing each of the four detection values ​​with a predetermined lower limit reference value and upper limit reference value. When the detection value is smaller than the lower limit reference value or when the detection value is larger than the upper limit reference value, it is determined that the detection value is outside the first reference range. On the other hand, when the detection value is equal to or larger than the lower limit reference value and equal to or smaller than the upper limit reference value, it is determined that the detection value is not outside the first reference range, that is, is within the first reference range.

[0060] Note that a case where the detected value is smaller than the lower reference value corresponds to "decrease" in Figures 6 and 7. A case where the detected value is larger than the upper reference value corresponds to "increase" in Figures 6 and 7. A case where the detected value is equal to or larger than the lower reference value and equal to or smaller than the upper reference value corresponds to "-" in Figures 6 and 7.

[0061] If, as a result of judging whether each of the four detection values ​​is outside the first reference range, the unit control unit 46 judges that at least one of the four detection values ​​is outside the first reference range, then in step S20, the unit control unit 46 judges that the detection values ​​are outside the first reference range. On the other hand, if all of the four detection values ​​are not outside the first reference range, that is, are within the first reference range, then in step S20, the unit control unit 46 judges that the detection values ​​are not outside the first reference range.

[0062] If it is determined in step S20 that the detection value in the standby state is not outside the first reference range, the unit control unit 46 determines in step S21 whether the detection value in the power supply state is within the second reference range. Specifically, as in step S20, the detection value is compared with the second reference range for each of the four detection values, and if at least one of the four detection values ​​is outside the second reference range, it is determined in step S21 that the detection value is outside the second reference range. On the other hand, if all of the four detection values ​​are not outside the second reference range, that is, are within the second reference range, after comparing each detection value with the second reference range, the unit control unit 46 determines in step S21 that the detection value is not outside the second reference range.

[0063] If it is determined in step S21 that the detection value in the power supply state is not outside the second reference range, the detection value is within the reference range in both the standby state and the power supply state, so that in step S22 the unit control unit 46 determines that the power transmission unit 40 is normal, sets it to a power supply permitted state, and terminates this processing routine.

[0064] If it is determined in step S21 that the detection value in the power supply state is outside the second reference range, the detection value in the standby state is outside the first reference range, which is abnormal, so the unit control unit 46 advances the process to step S38.

[0065] If it is determined in step S20 that the detection value in the standby state is outside the first reference range, the unit control unit 46 determines in step S24 that an abnormality has occurred and sets the power transmission unit 240 to a power supply prohibited state. In step S32, the unit control unit 46 transmits a first abnormality notification signal to the power transmission control device 60, indicating that an abnormality has been determined in the standby state.

[0066] In step S34, the unit control unit 46 judges whether or not the detection value in the power supply state is outside the second reference range, as in step S21. If it is judged that the detection value in the power supply state is not outside the second reference range, the unit control unit 46 ends this processing routine. On the other hand, if it is judged that the detection value in the power supply state is outside the second reference range, the unit control unit 46 judges in step S38 that an abnormality has occurred and sets the power transmission unit 240 to a power supply prohibited state. In step S40, the unit control unit 46 transmits a second abnormality notification signal indicating that an abnormality has been determined in the power supply state to the power transmission control device 60, sets the power transmission unit 240 to a power supply prohibited state, and then ends this processing routine.

[0067] In step S18, the detection value acquired by the unit control unit 46 is also referred to as a second detection value. Steps S21 and S34 are also referred to as second determination steps. Step S38 is also referred to as a second abnormality determination step. Steps S34 and S38 are also referred to as a second abnormality determination process. Step S10 is also referred to as a power receiving device determination step.

[0068] According to the second embodiment described above, the same effects as those of the first embodiment are achieved. Furthermore, when the unit control unit 46 determines in step S24 that an abnormality has occurred, it transmits a first abnormality notification signal to the power transmission control device 60 in step S32. When the unit control unit 46 determines in step S38 that an abnormality has occurred, it transmits a second abnormality notification signal to the power transmission control device 60 in step S40. As a result, when the power transmission control device 60 receives at least one of the first abnormality notification signal and the second abnormality notification signal, it can perform a response process. As a response process, for example, it is possible to stop the power supply from the AC power source 11 to the power transmission unit 240. As a result, for example, a secondary failure can be suppressed by generating a magnetic flux from the power transmission unit 240. As a response process, for example, it is possible to prompt the manager of the non-contact power supply device 10 to repair the failure.

[0069] Furthermore, when the unit control unit 46 determines in step S10 that the power receiving device 80 is not located within the positional range in which contactless power supply is possible, it performs steps S20 and S34 to compare the detection value with a reference range. This allows the unit control unit 46 to accurately determine whether or not an abnormality has occurred.

[0070] C. Alternative form 1 of the second embodiment: In this embodiment, after step S24 in Fig. 9, the unit control unit 46 performs a fourth judgment step of judging whether or not the detection value of the voltage sensor 53 is outside a predetermined first reference voltage range, a fifth judgment step of judging whether or not the detection value of the second current sensor 54 is outside a predetermined first reference current range, and a sixth judgment step of judging whether or not the detection value of the magnetic sensor 52 is outside a predetermined first reference magnetic flux range. Thereafter, when the unit control unit 46 judges in the fourth judgment step that the detection value of the voltage sensor 53 is outside the first reference voltage range, and judges in the fifth judgment step that the detection value of the second current sensor 54 is outside the first reference current range, and judges in the sixth judgment step that the detection value of the magnetic sensor 52 is outside the first reference magnetic flux range, it judges that the first switch SW1 has a short-circuit failure. According to this embodiment, it is possible to identify that the failure is a short-circuit failure of the first switch SW1.

[0071] The first reference voltage range, the first reference current range, and the first reference voltage range are determined in advance through experiments or the like.

[0072] Furthermore, when it is determined that the first switch SW1 has a short-circuit fault, the unit control unit 46 may transmit a notification signal indicating that the first switch SW1 has a short-circuit fault to the power transmission control device 60. By transmitting the notification signal, for example, a manager of the contactless power supply device 10 can repair the contactless power supply device 10 early because the fault location has been identified in advance.

[0073] D. Alternative form 2 of the second embodiment: In this embodiment, after step S38, the unit control unit 46 performs a seventh judgment step of judging whether or not the detection value of the voltage sensor 53 is outside the predetermined second reference voltage range, an eighth judgment step of judging whether or not the detection value of the second current sensor 54 is outside the predetermined second reference current range, and a ninth judgment step of judging whether or not the detection value of the magnetic sensor 52 is outside the predetermined second reference magnetic flux range. Thereafter, when the unit control unit 46 judges in the seventh judgment step that the detection value of the voltage sensor 53 is outside the second reference voltage range, and judges in the eighth judgment step that the detection value of the second current sensor 54 is outside the second reference current range, and judges in the ninth judgment step that the detection value of the magnetic sensor 52 is outside the second reference magnetic flux range, it judges that the power transmitting resonant circuit 42 is faulty. According to this embodiment, it is possible to identify that the power transmitting resonant circuit 42 is faulty. By identifying the fault location, it is possible to achieve the same effect as the above-mentioned "Alternative embodiment 1 of the second embodiment".

[0074] E. Alternative form 3 of the second embodiment: This embodiment corresponds to "foreign object (metal, etc.)" and "foreign object (magnetic material, etc.)" in Fig. 7. When a foreign object such as a metal or a magnetic material adheres near the power transmitting coil L1, the inductance of the power transmitting coil L1 and the inductance of the tertiary coil L3 magnetically coupled to the power transmitting coil L1 change. Therefore, the detection value in the power supply state changes.

[0075] However, the amount of change in the detection value due to the attachment of a foreign object is smaller than that due to a circuit element failure. Therefore, in this embodiment, if the amount of change in the detection value is relatively small, it is determined that the failure is due to a foreign object, and if the amount of change in the detection value is relatively large, it is determined that the failure is due to a circuit element. In detail, in this embodiment, the second reference range in steps S21 and S34 in FIG. 9 is used to determine whether or not the failure is due to a foreign object. Then, a circuit reference range that is larger than the range outside the second reference range is used to determine whether or not the failure is due to a circuit element.

[0076] If the unit control unit 46 determines in step S34 that the detection value is outside the second reference range, it performs a third determination step of determining whether or not the detection value is outside a circuit reference range that is larger than the second reference range. After that, if the unit control unit 46 determines in the third determination step that the detection value is outside the circuit reference range, it determines that a circuit abnormality has occurred in the circuit of the non-contact power supply device 210. On the other hand, if the unit control unit 46 determines in the third determination step that the detection value is not outside the circuit reference range, it determines that a foreign object abnormality has occurred in the non-contact power supply device 210.

[0077] According to this embodiment, it is possible to distinguish whether the cause of the failure is a circuit element or a foreign object. By identifying whether the failure location is a circuit element or a foreign object, it is possible to achieve the same effect as the above-mentioned "Alternative embodiment 1 of the second embodiment."

[0078] In addition, "increase / decrease" in FIG. 7 indicates that the current value may increase or decrease compared to the normal state depending on the magnitude relationship with the inductance of the power transmitting coil L1 and the power receiving coil L2.

[0079] F. Third embodiment: In the power transmitting unit 340 according to this embodiment shown in Fig. 10, the circuit configuration of the coupling circuit 348 is different from that of the coupling circuit 48 according to the second embodiment. Also, the processing content of the abnormality determination processing is different from that of the second embodiment. The same configurations and processing steps as those in the above embodiments are denoted by the same reference numerals, and detailed explanations are omitted as appropriate.

[0080] F1.Circuit configuration of the non-contact power supply device: The coupling circuit 348 of this embodiment further includes an additional capacitor C4 and a third switch SW3 in addition to the coupling circuit 48 of the second embodiment. The additional capacitor C4 and the third switch SW3 function in the same manner as the first switch SW1 and the second power transmission capacitor C12 of the power transmission resonant circuit 42. That is, the additional capacitor C4 is connected in series with the third switch SW3, and the connection between the additional capacitor C4 and the third switch SW3 is connected in parallel with the tertiary capacitor C3. The capacitance value of the LC parallel resonant circuit including the tertiary coil L3 is changed by switching the state of the third switch SW3 between the off state and the on state. Specifically, when the coupling circuit 348 is set to a resonant state, the second switch SW2 is set to an off state and the third switch SW3 is set to an on state. On the other hand, when the coupling circuit 348 is set to a non-resonant state, the second switch SW2 is set to an off state and the third switch SW3 is set to an off state. In the coupling circuit 348, the non-resonant state can be set by using the third switch SW3 in addition to the second switch SW2. Therefore, for example, even if an open circuit fault occurs in which the second switch SW2 is always in an off state, the tertiary resonant circuit 948 can be set to the non-resonant state by using the third switch SW3.

[0081] In this embodiment, the power transmission control device 60 is capable of communicating with a power receiving side control unit 96 of the power receiving device 80 (FIG. 5).

[0082] F2. Overview of Anomaly Detection Process: In this embodiment, when performing the abnormality determination process, in addition to the detection values ​​when the power transmitting unit 340 is set to the standby state and the power supply state, the detection value when the power transmitting unit 340 is set to the inspection state is used. The inspection state is a state that is not set in the power supply sequence. By using the detection value in the inspection state, it is possible to detect a failure of the third switch SW3, as will be described in detail later.

[0083] 10, when the power transmitting unit 340 is set to a standby state, the first switch SW1, the second switch SW2, and the third switch SW3 are all set to an off state. When the power transmitting unit 340 is set to a power supply state, the first switch SW1 and the third switch SW3 are set to an on state, and the second switch SW2 is set to an off state. When the power transmitting unit 340 is set to an inspection state, the first switch SW1 is set to an off state, and the second switch SW2 and the third switch SW3 are set to an on state. As a result, the power transmitting resonant circuit 42 and the coupling circuit 348 are both set to a non-resonant state.

[0084] As in the second embodiment, as shown in FIG. 11, in the standby state, the current flowing through the power transmission coil L1 and the current flowing through the tertiary coil L3 are both small. In the power supply state, the current flowing through the tertiary coil L3 is larger than the current flowing through the power transmission coil L1. In the inspection state, the power transmission resonant circuit 42 is set to a non-resonant state, so that the current flowing through the power transmission coil L1 is small, as in the standby state. The difference between the standby state and the inspection state is the settings of the second switch SW2 and the third switch SW3. In the standby state, the second switch SW2 and the third switch SW3 are both set to an off state. In contrast, in the inspection state, the second switch SW2 and the third switch SW3 are both set to an on state. In the inspection state, the tertiary coil L3 is short-circuited, so that the current flowing through the tertiary coil L3 is reduced from that in the standby state.

[0085] As shown in FIG. 10, when the second switch SW2 has an open fault, in the inspection state, the third switch SW3 is set to the on state, and a parallel resonant circuit is formed by the tertiary coil L3, the tertiary capacitor C3, and the additional capacitor C4. Therefore, as shown in FIG. 12, in the inspection state, the power transmission coil L1 through which the standby current flows and the tertiary coil L3 are magnetically coupled, and the parallel resonant circuit is in a resonant state, so that the current flowing through the tertiary coil L3 increases more than in normal times. In this way, an open fault of the second switch SW2 can be detected. The correspondence between the fault and the change in the detection value is as shown in FIG. 12 to FIG. 14.

[0086] F3. Details of abnormality inspection process: 15, the unit control unit 46 transmits an inspection enable signal to the power transmission control device 60 in step S50. Upon receiving the inspection enable signal, the power transmission control device 60 transmits an inspection permission signal to the power transmission unit 40 so that at least two adjacent power transmission units 40 among the arranged power transmission units 40 do not execute an abnormality detection process at the same time. Specifically, the power transmission control device 60 sets one power transmission unit 340 among the multiple power transmission units 340 as a target power transmission unit for performing an abnormality determination process. In this embodiment, the power transmission control device 60 sets the target power transmission unit in the order of arrangement of the arranged power transmission units 40.

[0087] After transmitting the inspection permission signal, the power transmission control device 60 transmits to the power receiving device 80 a second prohibition signal that prohibits the power receiving device 80 from approaching the power transmission resonance circuit 42, the state of which is switched by the switching circuit 44 controlled by the unit control device 46, which is the destination of the inspection permission signal. When the power receiving side control device 96 receives the second prohibition signal, it does not move within a predetermined position range centered on the power transmission resonance circuit 42, which is the destination of the inspection permission signal, until it receives a permission signal. Specifically, for example, the power transmission control device 60 includes, in the second prohibition signal, position information of the power transmission unit 340 including the power transmission resonance circuit 42, which is the destination of the inspection permission signal. The power receiving side control device 96 stops moving or moves around the position range. This makes it possible to suppress fluctuations in the current flowing through the power transmission coil L1 to be inspected, which are caused by the adjacent power transmission coil L1 generating magnetic flux. In addition, it is possible to suppress fluctuations in the current flowing through the power transmission coil L1 to be inspected, which are caused by the power receiving coil L2 of the power receiving device 80 approaching. This makes it possible to improve the inspection accuracy.

[0088] In step S52, the unit control unit 46 determines whether or not an inspection permission signal has been received from the power transmission control device 60. If it is determined in step S52 that an inspection permission signal has been received, the process proceeds to step S10. On the other hand, if it is determined in step S52 that an inspection permission signal has not been received, the unit control unit 46 repeatedly executes steps S50 and S52 until it determines that an inspection permission signal has been received.

[0089] When the unit control unit 46 determines in step S52 that it has received the inspection permission signal, it executes steps S10 to S18. In step S54, the unit control unit 46 sets the power transmission unit 340 to an inspection state. In step S56, the unit control unit 46 acquires a detection value in the inspection state and stores the acquired detection value in a built-in memory. In step S20, the unit control unit 46 determines whether or not the detection value in the standby state is outside the first reference range. When the unit control unit 46 determines in step S20 that the detection value in the standby state is not outside the first reference range, it determines in step S21 of FIG. 16 whether or not the detection value in the power supply state is outside the second reference range. When the unit control unit 46 determines in step S21 that the detection value in the power supply state is outside the second reference range, it advances the process to step S38.

[0090] If the unit control unit 46 determines in step S21 that the detection value in the power supply state is not outside the second reference range, then in step S58 it determines whether the detection value in the inspection state is outside the third reference range. If the unit control unit 46 determines in step S58 that the detection value in the inspection state is outside the third reference range, it advances the process to step S62. If the unit control unit 46 determines in step S58 that the detection value in the inspection state is not outside the third reference range, then in step S22 it determines that the unit is normal. In step S66, the unit control unit 46 transmits an inspection end signal to the power transmission control device 60 and ends this processing routine. Upon receiving the inspection end signal, the power transmission control device 60 changes the target power transmission unit.

[0091] 15, when the unit control unit 46 determines that the detection value in the standby state is outside the first reference range, it determines that an abnormality exists in step S24. In step S32, the unit control unit 46 transmits a first abnormality notification signal to the power transmission control device.

[0092] In step 34 of Fig. 16, the unit control unit 46 determines whether or not the detection value in the power supply state is outside the second reference range. If it is determined in step 34 that the detection value in the power supply state is not outside the second reference range, the unit control unit 46 advances the process to step S60. If it is determined in step 34 that the detection value in the power supply state is outside the second reference range, the unit control unit 46 determines in step S38 that an abnormality has occurred. In step S40, the unit control unit 46 transmits a second abnormality notification signal to the power transmission control device 60.

[0093] In step S60, the unit control unit 46 determines whether the detection value in the inspection state is outside the third reference range. If it is determined in step S60 that the detection value in the inspection state is not outside the third reference range, the unit control unit 46 advances the process to step S66. If it is determined in step S60 that the detection value in the inspection state is outside the third reference range, the unit control unit 46 determines in step S62 that there is an abnormality. In step S64, the unit control unit 46 transmits a third or higher notification signal indicating that the detection value in the inspection state is outside the third reference range to the power transmission control device 60. After executing step S64, the unit control unit 46 advances the process to step S66.

[0094] When the power transmission control device 60 receives at least one of the first abnormality notification signal, the second abnormality notification signal, and the third abnormality signal, it transmits a first prohibition signal to the power transmission unit 340 adjacent to the power transmission unit 340 that transmitted the signal, prohibiting the power transmission resonant circuit 42 from being set in a resonant state. When the unit control unit 46 receives the first prohibition signal, it maintains the state of the power transmission resonant circuit 42 in a non-resonant state until it receives an enabling signal. This makes it possible to suppress secondary failures in the power transmission unit 340, for example, caused by excessive generation of magnetic flux.

[0095] According to the third embodiment described above, the same effects as those of the above-mentioned embodiments are achieved. Furthermore, when the power transmission control device 60 receives at least one of the first abnormality notification signal, the second abnormality notification signal, and the third abnormality notification signal, the power transmission control device 60 transmits a first prohibition signal to the power transmission unit 340 adjacent to the power transmission unit 340 that transmitted the signal. This makes it possible to suppress the occurrence of a secondary failure.

[0096] Furthermore, the power transmission control device 60 sets one of the power transmission units 340 as a target power transmission unit and transmits an inspection permission signal to the target power transmission unit. When the power transmission unit 340 receives the inspection permission signal, it performs an abnormality determination process. This prevents two adjacent power transmission units 340 from performing an abnormality determination process at the same time, preventing magnetic flux interference and improving the accuracy of the determination of the detection value.

[0097] In addition, the unit control unit 46 transmits a second prohibition signal to the power receiving device 80 to prohibit the power receiving device 80 from approaching the power transmitting unit 340 including the unit control unit 46 to which the inspection permission signal is transmitted. This prevents the power transmitting coil L1 and the power receiving coil L2, in which the abnormality determination process is performed, from being magnetically coupled, thereby improving the detection accuracy. It is possible to suppress erroneous detections in which a malfunction is determined to be normal despite the occurrence of a malfunction, and erroneous detections in which a malfunction is determined to be abnormal despite the occurrence of no malfunction.

[0098] G. Fourth embodiment: 17, the circuit configuration of a power transmitting unit 440 according to this embodiment differs from that of the above-described embodiments. The same components as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

[0099] G1.Circuit configuration of non-contact power supply device: The power transmitting unit 440 includes a power transmitting coil L1, a power transmitting capacitor C1, a first switch SW1, and a second switch SW2. The power transmitting capacitor C1 is connected in parallel with the power transmitting coil L1. The first switch SW1 is connected in series with the power transmitting coil L1. The second switch SW2 is connected between the first switch SW1 and the power transmitting coil L1. The power transmitting resonant circuit 442 is a parallel resonant circuit.

[0100] When setting the standby state, the unit control section 46 sets the first switch SW1 to the OFF state and sets the second switch SW2 to the ON state. When setting the power supply state, the unit control section 46 sets the first switch SW1 to the ON state and sets the second switch SW2 to the OFF state.

[0101] The second current sensor 54 is connected between the AC power supply 11 and the first switch SW1, and detects the input current to the power transmitting resonant circuit 442. The voltage sensor 53 detects the voltage of the power transmitting capacitor C1. The first current sensor 51 and the magnetic sensor 52 are the same as those in the first embodiment.

[0102] The changes in each detection value when a failure occurs are as shown in Figures 18 and 19. "I(IN)" in Figures 18 and 19 is the detection value of the second current sensor 54.

[0103] In the power transmitting resonant circuit 442 of the present embodiment, when the first switch SW1 is short-circuited in the standby state, the detection value of the first current sensor 51 increases compared to the normal state. Therefore, similarly to the first embodiment, the abnormality detection process can be performed using the detection value in the standby state.

[0104] H. Fifth embodiment: 20, the circuit configuration of a power transmitting unit 540 according to this embodiment differs from that of each of the above-described embodiments. The same components as those of the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

[0105] H1.Circuit configuration of the non-contact power supply device: The power transmitting unit 540 includes a power transmitting coil L1, a first power transmitting capacitor C11, a second power transmitting capacitor C12, a first switch SW1, a second switch SW2, and a third switch SW3. The first power transmitting capacitor C11 is connected in parallel with the power transmitting coil L1. The second power transmitting capacitor C12 is connected in series with the third switch SW3. The third switch SW3 is a one-way switch having one FET. A connection between the second power transmitting capacitor C12 and the third switch SW3 is connected in parallel with the power transmitting coil L1. The second switch SW2 is connected in series with the power transmitting coil L1. The first switch SW1 is connected in series with the power transmitting coil L1. The second switch SW2, the connection between the second power transmitting capacitor C12 and the third switch SW3, and the first power transmitting capacitor C11 are connected between the first switch SW1 and the power transmitting coil L1.

[0106] By switching the on / off state of the third switch SW3, the capacitance value of the power transmitting resonant circuit 542, which is a parallel resonant circuit, is switched.

[0107] When setting the standby state, the unit control unit 46 sets the first switch SW1 to the OFF state, sets the second switch SW2 to the ON state, and sets the third switch SW3 to the OFF state. When setting the power supply state, the unit control unit 46 sets the first switch SW1 to the ON state, sets the second switch SW2 to the OFF state, and sets the third switch SW3 to the ON state. When setting the inspection state, the first switch SW1 is set to the OFF state, sets the second switch SW2 to the OFF state, and sets the third switch SW3 to the OFF state. When setting the second inspection state, the first switch SW1 is set to the OFF state, sets the second switch SW2 to the ON state, and sets the third switch SW3 to the ON state.

[0108] In the power transmitting resonant circuit 542 of the present embodiment, when the first switch SW1 or the third switch SW3 is short-circuited in the standby state, the detection value of the first current sensor 51 increases compared to the normal state. Therefore, similarly to the first embodiment, the abnormality detection process can be performed using the detection value in the standby state.

[0109] I. Other Embodiments: (I1) In the first embodiment, the unit control unit 46 performs the abnormality detection process at the start-up of the power transmitting unit 40. The timing at which the abnormality detection process is performed is not limited to the start-up of the power transmitting unit 40, and may be performed, for example, at the timing when an administrator instructs the unit control unit 46 to perform the abnormality detection process.

[0110] (I2) The order of steps S14, S16, and S18 in the abnormality detection process according to the second embodiment is not limited to the above, since it is sufficient to obtain detection values ​​in each state. Similarly, the order of steps S20, S21, and S34 for determining whether or not there is an abnormality is not limited to the above. The same applies to the abnormality detection process according to the third embodiment.

[0111] (I3) In the first embodiment, the approach of the power receiving coil L2 is detected using the magnetic sensor 52. The method of detecting the power receiving coil L2 is not limited to this, and for example, the power receiving coil L2 may be detected by a camera or the like.

[0112] (I4) In the first embodiment, the power transmitting resonant circuit 42 has a so-called SS type circuit configuration in which the power transmitting capacitor C1 is connected in series to the power transmitting coil L1, and the power receiving resonant circuit 81 has a so-called SS type circuit configuration in which the power receiving capacitor C2 is connected in series to the power receiving coil L2. The circuit configuration of the power transmitting resonant circuit 42 and the circuit configuration of the power receiving resonant circuit 81 are not limited to the SS type. (a) For example, the power transmitting resonant circuit 42 may have a so-called PS type circuit configuration in which the power transmitting capacitor C1 is connected in parallel to the power transmitting coil L1, and the power receiving resonant circuit 81 may have a so-called PS type circuit configuration in which the power receiving capacitor C2 is connected in series to the power receiving coil L2. (b) Also, in addition to the power transmitting capacitor C1 connected in series to the power transmitting coil L1, a capacitor connected in parallel to the power transmitting coil L1 is provided, and the power receiving resonant circuit 81 may have a so-called P-SS type circuit configuration in which two power receiving capacitors C2 are connected in series to each of both terminals of the power receiving coil L2. (c) In addition to the power transmitting capacitor C1 connected in series to the power transmitting coil L1, a capacitor connected in parallel to the power transmitting coil L1 may be provided, and the power receiving resonant circuit 81 may have a so-called SP-PS type circuit configuration, which includes a first power receiving capacitor connected in series to the power receiving coil L2 and a second power receiving capacitor connected in parallel to the power receiving coil L2. (d) The power transmitting resonant circuit 42 may also have a closed circuit in which a coil and a capacitor are connected in series. The coil of this closed circuit is arranged at a position where it can be magnetically coupled to the power receiving coil L2 when the power transmitting coil L1 and the power receiving coil L2 are magnetically coupled. (e) Furthermore, the capacitor of the closed circuit may be connected in parallel to the coil, not in series. (f) The power transmitting resonant circuit 42 may also have a coil connected in series to the power transmitting coil L1 and a capacitor connected in parallel to the coil. This coil is arranged at a position where it can be magnetically coupled to the power receiving coil L2 when the power transmitting coil L1 and the power receiving coil L2 are magnetically coupled.

[0113] (I5) In the first embodiment, the switching element constituting the first switch SW1 is realized by a FET. In other embodiments, the switching element may be realized by other semiconductor elements, for example, an IGBT (Insulated Gate Bipolar Transistor) connected to a freewheeling diode. The same applies to the second switch SW2 and the third switch SW3 in embodiments other than the first embodiment. In addition, the first switch SW1 is not limited to a bidirectional switch, and may be a unidirectional switch composed of one switching element. The third switch SW3 may be a bidirectional switch.

[0114] (I6) In the second embodiment, the second current sensor 54 directly detects the current value of the current flowing through the tertiary coil L3. The method of detecting the current flowing through the tertiary coil L3 is not limited to the method using the second current sensor 54. As with the first current sensor 51, the current flowing through the tertiary coil L3 may be indirectly detected by detecting the voltage value of the tertiary coil L3 or the magnetic flux density in the vicinity of the tertiary coil L3. Similarly, the method of directly detecting the voltage value of the second power transmitting capacitor C12 is not limited to the method using the voltage sensor 53. The voltage value of the second power transmitting capacitor C12 may be indirectly detected by detecting the current value flowing through the second power transmitting capacitor C12. In addition, in the second embodiment, the power transmitting unit 240 includes the first current sensor 51, the magnetic sensor 52, the voltage sensor 53, and the second current sensor 54. The power transmitting unit 240 is not limited to a configuration including four sensors, the first current sensor 51, the magnetic sensor 52, the voltage sensor 53, and the second current sensor 54. It is preferable to attach sensors according to a desired fault. For example, the power transmitting unit 240 can detect a short-circuit fault of the first switch SW1 by including at least the first current sensor 51.

[0115] (I7) The coupling circuit 348 of the third embodiment includes a tertiary capacitor C3 connected in parallel to the tertiary coil L3 and an additional capacitor C4. As another embodiment of the coupling circuit 348, the tertiary capacitor C3 may not be included. When the tertiary capacitor C3 is not included, the state of the coupling circuit 348 may be switched between a non-resonant state and a resonant state by switching the state of the third switch SW3 connected in series with the additional capacitor C4 between an off state and an on state.

[0116] (I8) In the third embodiment, the power transmission control device 60 can communicate with the power receiving side control unit 96 of the power receiving device 80. When communication with the power transmission control device 60 is not performed, for example, in step S50 in the abnormality detection process shown in Fig. 15, the power transmission control device 60 and the power receiving side control unit 96 may not be able to communicate with each other.

[0117] The present disclosure is not limited to the above-mentioned embodiments and modifications, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments and modifications corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted.

[0118] J:Other forms: The features of the present disclosure are as follows: (Form 1) A non-contact power supply device (10, 210) that non-contactly supplies power to a power receiving device (80) having a secondary coil (L2), a power transmitting resonant circuit (42, 442, 542) having a primary coil (L1) that can be magnetically coupled to the secondary coil and a primary capacitor (C1); An AC power source (11) that supplies AC power having a predetermined operating frequency to the power transmitting resonant circuit; A switching circuit (44) for switching a state of the power transmitting resonant circuit between a resonant state and a non-resonant state; a detection unit (51) for directly or indirectly detecting a current value of a current flowing through the primary coil; a unit control unit (46) for controlling the switching circuit, The unit control unit includes: performing at least one of a first abnormality determination process for determining whether or not the non-contact power supply device is abnormal by using a first detection value detected by the detection unit in the non-resonant state, and a second abnormality determination process for determining whether or not the non-contact power supply device is abnormal by using a second detection value detected by the detection unit in the resonant state; In the first abnormality determination process, a first determination step is performed to determine whether or not the first detection value is outside a predetermined first reference range, and a first abnormality determination step is performed to determine that the first detection value is abnormal when it is determined in the first determination step that the first detection value is outside the first reference range, A contactless power supply device, in which, in the second abnormality judgment process, a second judgment step is performed to judge whether the second detection value is outside a predetermined second reference range, and a second abnormality judgment step is performed to judge that an abnormality exists if it is determined in the second judgment step that the second detection value is outside the second reference range. (Form 2) The non-contact power supply device according to aspect 1, The unit control unit, in the second abnormality determination process, If it is determined in the second judgment step that the second detection value is outside the second reference range, a third judgment step is further performed to determine whether the second detection value is outside a circuit reference range that is larger than the second reference range, and if it is determined in the third judgment step that the second detection value is outside the circuit reference range, it is determined that the abnormality is a circuit abnormality in a circuit of the non-contact power supply device, and if it is determined in the third judgment step that the second detection value is not outside the circuit reference range, it is determined that the abnormality is a foreign object abnormality in which a foreign object has adhered to the non-contact power supply device. (Form 3) The non-contact power supply device according to aspect 1, A power transmission control device (60) that communicates with the unit control unit, The unit control unit transmits a first abnormality notification signal to the power transmission control device when it determines that an abnormality exists in the first abnormality judgment process, and transmits a second abnormality notification signal to the power transmission control device when it determines that an abnormality exists in the second abnormality judgment process. (Form 4) The non-contact power supply device according to aspect 3, a plurality of power transmitting units (40) each including the power transmitting resonant circuit, the switching circuit, the detection unit, and the unit control unit; The plurality of power transmitting units are arranged in an array, The power transmission control device includes: When at least one of the first abnormality notification signal and the second abnormality notification signal is received, a first prohibition signal is transmitted to a power transmitting unit adjacent to the power transmitting unit that transmitted at least one of the first abnormality notification signal and the second abnormality notification signal, the first prohibition signal prohibiting the power transmitting resonant circuit from being set in the resonant state. (Form 5) The non-contact power supply device according to aspect 3, a plurality of power transmitting units (40) each including the power transmitting resonant circuit, the switching circuit, the detection unit, and the unit control unit; The power transmission control device includes: setting one of the plurality of power transmission units as a target power transmission unit for performing at least one of the first abnormality determination process and the second abnormality determination process; Transmitting an inspection permission signal to the target power transmitting unit; When the target power transmitting unit receives the inspection permission signal, the target power transmitting unit performs at least one of the first abnormality determination process and the second abnormality determination process. (Form 6) A non-contact power supply device according to any one of aspects 1 to 5, The unit control section performs at least one of the first abnormality determination process and the second abnormality determination process when the contactless power supplying device is started up. (Form 7) A contactless power supply device according to any one of aspects 1 to 6, performing a power receiving device determination step of determining whether or not the power receiving device is located within a position range in which wireless power supply is possible before performing at least one of the first abnormality determination process and the second abnormality determination process; a contactless power supply device that performs at least one of the first abnormality determination process and the second abnormality determination process after determining that the power receiving device is not located in the power receiving device determination step; (Form 8) A non-contact power supply device according to any one of aspects 1 to 7, A power transmission control device that communicates with the unit control unit, The power transmission control device transmits an inspection permission signal to the unit control unit, When the unit control unit receives the inspection permission signal, the unit control unit performs at least one of the first abnormality determination process and the second abnormality determination process, The power transmission control device transmits a second prohibition signal to the power receiving device, prohibiting the power receiving device from approaching the power transmitting resonant circuit, the state of which is switched by the switching circuit controlled by the unit control unit to which the inspection permission signal is sent. (Form 9) A non-contact power supply device according to any one of aspects 1 to 8, The primary capacitor includes a first power transmission capacitor and a second power transmission capacitor, The power transmitting resonant circuit further includes a first switch connected in series with the second power transmitting capacitor, the first power transmission capacitor is connected in series with the primary coil; a connection between the second power transmitting capacitor and the first switch is connected in parallel with the first power transmitting capacitor, the detection unit is a first current sensor that directly detects a current value of a current flowing through the primary coil, The non-contact power supply device further comprises: a coupling circuit including a tertiary coil capable of magnetically coupling with the primary coil, a tertiary capacitor connected in parallel with the tertiary coil, and a second switch connected in parallel with the tertiary coil; A voltage sensor that detects a voltage of the second power transmission capacitor; A second current sensor that directly detects a current flowing through the tertiary coil; a magnetic sensor that detects the magnitude of magnetic flux in the vicinity of the primary coil; The switching circuit sets the power transmitting resonant circuit to the resonant state by setting the first switch to an on state, and sets the power transmitting resonant circuit to the non-resonant state by setting the first switch to an off state; After the first abnormality determination step, the unit control unit performs a fourth determination step of determining whether or not a detection value of the voltage sensor is outside a predetermined first reference voltage range, a fifth determination step of determining whether or not a detection value of the second current sensor is outside a predetermined first reference current range, and a sixth determination step of determining whether or not a detection value of the magnetic sensor is outside a predetermined first reference magnetic flux range, a contactless power supply device which determines in the fourth judgment step that the detection value of the voltage sensor is outside the first reference voltage range, and in the fifth judgment step that the detection value of the second current sensor is outside the first reference current range, and in the sixth judgment step that the detection value of the magnetic sensor is outside the first reference magnetic flux range, determines that the first switch has a short-circuit fault. (Form 10) The non-contact power supply device according to aspect 9, After the second abnormality determination step, the unit control unit performs a seventh determination step of determining whether or not a detection value of the voltage sensor is outside a predetermined second reference voltage range, an eighth determination step of determining whether or not a detection value of the second current sensor is outside a predetermined second reference current range, and a ninth determination step of determining whether or not a detection value of the magnetic sensor is outside a predetermined second reference magnetic flux range, a contactless power supply device that determines that the power transmitting resonant circuit has a fault when the seventh judgment step determines that the detection value of the voltage sensor is outside the second reference voltage range, the eighth judgment step determines that the detection value of the second current sensor is outside the second reference current range, and the ninth judgment step determines that the detection value of the magnetic sensor is outside the second reference magnetic flux range. (Form 11) A non-contact power supply device according to any one of aspects 1 to 8, The primary capacitor includes a first power transmission capacitor and a second power transmission capacitor, The power transmitting resonant circuit further includes a first switch connected in series with the second power transmitting capacitor, the first power transmission capacitor is connected in series with the primary coil; a connection between the second power transmitting capacitor and the first switch is connected in parallel with the first power transmitting capacitor, the contactless power supply device further includes a coupling circuit including a tertiary coil capable of magnetically coupling with the primary coil, a tertiary capacitor connected in parallel with the tertiary coil, a second switch connected in parallel with the tertiary coil, an additional capacitor, and a third switch connected in series with the additional capacitor; a connection between the additional capacitor and the third switch is connected in parallel to the tertiary coil; the detection unit is a first current sensor that directly detects a current value of a current flowing through the primary coil, The switching circuit sets the power transmission resonant circuit to the resonant state by setting the first switch and the third switch to an on state and the second switch to an off state, and sets the power transmission resonant circuit to the non-resonant state by setting the first switch, the second switch, and the third switch to an off state. (Form 12) 12. The non-contact power supply device according to any one of aspects 1 to 11, The power transmitting resonant circuit further includes: (i) a first switch connected in series to the primary coil; and (ii) a second switch between the primary coil and the first switch, the second switch connected in parallel to the primary coil; the primary capacitor is connected in parallel with the primary coil between the first switch and the primary coil; the detection unit is a first current sensor that directly detects a current value of a current flowing through the primary coil, The switching circuit sets the power transmission resonant circuit to the resonant state by setting the first switch to an on state and the second switch to an off state, and sets the power transmission resonant circuit to the non-resonant state by setting the first switch to an off state and the second switch to an on state. [Explanation of symbols]

[0119] 10... non-contact power supply device, L1... power transmission coil, C1... power transmission capacitor, 11... AC power source, 42, 442, 542... power transmission resonance circuit, 44... switching circuit, 46... unit control unit, 51... first current sensor

Claims

1. A non-contact power supply device (10, 210) for non-contact power supply to a power receiving device (80) having a secondary coil (L2), comprising a plurality of power transmission units (40) arranged, each power transmission unit of the plurality of power transmission units has, a power transmission resonance circuit (42, 442, 542) having a primary coil (L1) magnetically coupled to the secondary coil and a primary capacitor (C1), a switching circuit (44) for switching the state of the power transmission resonance circuit between a resonance state and a non-resonance state, a detection unit (51) for directly or indirectly detecting the current value of the current flowing through the primary coil, and a unit control unit (46) for controlling the switching circuit, the non-contact power supply device has, an AC power supply (11) for supplying AC power of a predetermined operating frequency to the power transmission resonance circuit, and a power transmission control device (60) communicating with the unit control unit, the unit control unit, performs at least one of a first abnormality determination process for determining whether the non-contact power supply device is abnormal using a first detection value detected by the detection unit in the non-resonance state, and a second abnormality determination process for determining whether the non-contact power supply device is abnormal using a second detection value detected by the detection unit in the resonance state, in the first abnormality determination process, a first determination step of determining whether the first detection value is outside a predetermined first reference range, and a first abnormality determination step of determining that it is abnormal when it is determined that the first detection value is outside the first reference range in the first determination step are performed, in the second abnormality determination process, a second determination step of determining whether the second detection value is outside a predetermined second reference range, and a second abnormality determination step of determining that it is abnormal when it is determined that the second detection value is outside the second reference range in the second determination step are performed, when it is determined to be abnormal in the first abnormality determination process, a first abnormality notification signal is transmitted to the power transmission control device, and when it is determined to be abnormal in the second abnormality determination process, a second abnormality notification signal is transmitted to the power transmission control device, the power transmission control device, When receiving at least one of the first abnormality notification signal and the second abnormality notification signal, a non-contact power feeding device transmits a first prohibition signal for prohibiting setting the power transmission resonance circuit to the resonance state to a power transmission unit adjacent to the power transmission unit that has transmitted at least one of the first abnormality notification signal and the second abnormality notification signal.

2. The non-contact power feeding device according to claim 1, wherein in the second abnormality determination process, the unit control unit when it is determined in the second determination step that the value is outside the second reference range, further performs a third determination step of determining whether the second detected value is outside a circuit reference range that is larger in range than the second reference range. In the third determination step, when it is determined that the value is outside the circuit reference range, it is determined that there is an abnormality in the circuit of the non-contact power feeding device, which is a circuit abnormality. In the third determination step, when it is determined that the value is not outside the circuit reference range, it is determined that there is an abnormality due to foreign matter adhering to the non-contact power feeding device, which is a foreign matter abnormality. A non-contact power feeding device.

3. The non-contact power feeding device according to claim 1, wherein the power transmission control device sets one of the plurality of power transmission units as a target power transmission unit that performs at least one of the first abnormality determination process and the second abnormality determination process, transmits an inspection permission signal to the target power transmission unit, and when the target power transmission unit receives the inspection permission signal, the target power transmission unit performs at least one of the first abnormality determination process and the second abnormality determination process. A non-contact power feeding device.

4. The non-contact power feeding device according to claim 1, wherein the unit control unit performs at least one of the first abnormality determination process and the second abnormality determination process when the non-contact power feeding device is activated. A non-contact power feeding device.

5. A non-contact power feeding device (10, 210) that non-contact feeds a power receiving device (80) having a secondary coil (L2), a power transmission resonance circuit (42, 442, 542) having a primary coil (L1) that can be magnetically coupled to the secondary coil, and a primary capacitor (C1); an AC power supply (11) that supplies AC power at a predetermined operating frequency to the power transmission resonance circuit; a switching circuit (44) for switching the state of the power transmission resonance circuit between a resonance state and a non-resonance state; a detection unit (51) for directly or indirectly detecting the current value of the current flowing through the primary coil. A unit control unit (46) for controlling the switching circuit, The unit control unit, A first abnormality determination process for determining whether the non-contact power supply device is abnormal using the first detection value detected by the detection unit in the non-resonant state, and a second detection value detected by the detection unit in the resonant state. At least one of the second abnormality determination processes for determining whether the non-contact power supply device is abnormal using the above is performed, In the first abnormality determination process, a first determination step of determining whether the first detection value is outside a predetermined first reference range, and in the first determination step, when it is determined that the first detection value is outside the first reference range, a first abnormality determination step of determining that it is abnormal is performed, In the second abnormality determination process, a second determination step of determining whether the second detection value is outside a predetermined second reference range, and in the second determination step, when it is determined that the second detection value is outside the second reference range, a second abnormality determination step of determining that it is abnormal is performed, Before performing at least one of the first abnormality determination process and the second abnormality determination process, a power receiving device determination step of determining whether the power receiving device is located within a non-contact power supply possible position range is performed, A non-contact power supply device that performs at least one of the first abnormality determination process and the second abnormality determination process after determining in the power receiving device determination step that the power receiving device is not located.

6. The non-contact power supply device according to claim 5, Further comprising a power transmission control device that communicates with the unit control unit, The power transmission control device transmits an inspection permission signal to the unit control unit, When the unit control unit receives the inspection permission signal, it performs at least one of the first abnormality determination process and the second abnormality determination process, The power transmission control device transmits a second prohibition signal to the power receiving device to prohibit approach to the power transmission resonance circuit whose state is switched by the switching circuit controlled by the unit control unit which is the transmission destination of the inspection permission signal. Non-contact power supply device.

7. The non-contact power supply device according to claim 5, The primary capacitor includes a first power transmission capacitor and a second power transmission capacitor, The power transmission resonance circuit further has a first switch connected in series with the second power transmission capacitor, The first power transmission capacitor is connected in series to the primary coil, The connection body between the second power transmission capacitor and the first switch is connected in parallel with the first power transmission capacitor. The detection unit is a first current sensor that directly detects the current value of the current flowing through the primary coil. The non-contact power supply device further includes A coupling circuit having a tertiary coil that can be magnetically coupled to the primary coil, a tertiary capacitor connected in parallel with the tertiary coil, and a second switch connected in parallel with the tertiary coil. A voltage sensor that detects the voltage of the second power transmission capacitor. A second current sensor that directly detects the current flowing through the tertiary coil. A magnetic sensor that detects the magnitude of the magnetic flux near the primary coil. The switching circuit sets the power transmission resonance circuit to the resonance state by setting the first switch to the on state, and sets the power transmission resonance circuit to the non-resonance state by setting the first switch to the off state. After the first abnormality determination step, the unit control unit performs a fourth determination step of determining whether the detection value of the voltage sensor is outside a predetermined first reference voltage range, a fifth determination step of determining whether the detection value of the second current sensor is outside a predetermined first reference current range, and a sixth determination step of determining whether the detection value of the magnetic sensor is outside a predetermined first reference magnetic flux range. In the fourth determination step, when it is determined that the detection value of the voltage sensor is outside the first reference voltage range, and in the fifth determination step, when it is determined that the detection value of the second current sensor is outside the first reference current range, and in the sixth determination step, when it is determined that the detection value of the magnetic sensor is outside the first reference magnetic flux range, it is determined that the first switch has a short-circuit fault. Non-contact power supply device.

8. The non-contact power supply device according to claim 7, wherein After the second abnormality determination step, the unit control unit performs a seventh determination step of determining whether the detection value of the voltage sensor is outside a predetermined second reference voltage range, an eighth determination step of determining whether the detection value of the second current sensor is outside a predetermined second reference current range, and a ninth determination step of determining whether the detection value of the magnetic sensor is outside a predetermined second reference magnetic flux range. In the seventh determination step, when it is determined that the detected value of the voltage sensor is outside the second reference voltage range, and in the eighth determination step, when it is determined that the detected value of the second current sensor is outside the second reference current range, and in the ninth determination step, when it is determined that the detected value of the magnetic sensor is outside the second reference magnetic flux range, it is determined that the power transmission resonance circuit is faulty, a non-contact power supply device.

9. The non-contact power supply device according to claim 5, wherein the primary capacitor includes a first power transmission capacitor and a second power transmission capacitor, wherein the power transmission resonance circuit further has a first switch connected in series with the second power transmission capacitor, wherein the first power transmission capacitor is connected in series with the primary coil, wherein the connection body between the second power transmission capacitor and the first switch is connected in parallel with the first power transmission capacitor, wherein the non-contact power supply device further includes a tertiary coil capable of magnetic coupling with the primary coil, a tertiary capacitor connected in parallel with the tertiary coil, a second switch connected in parallel with the tertiary coil, an additional capacitor, and a third switch connected in series with the additional capacitor, and has a coupling circuit, wherein the connection body between the additional capacitor and the third switch is connected in parallel with the tertiary coil, wherein the detection unit is a first current sensor that directly detects the current value of the current flowing through the primary coil, wherein the switching circuit sets the power transmission resonance circuit to the resonance state by setting the first switch and the third switch to the on state and setting the second switch to the off state, and sets the power transmission resonance circuit to the non-resonance state by setting the first switch, the second switch, and the third switch to the off state, a non-contact power supply device.

10. The non-contact power supply device according to claim 5, wherein the power transmission resonance circuit further has (i) a first switch connected in series with the primary coil, and (ii) a second switch connected in parallel with the primary coil between the primary coil and the first switch, wherein the primary capacitor is connected in parallel with the primary coil between the first switch and the primary coil, wherein the detection unit is a first current sensor that directly detects the current value of the current flowing through the primary coil, The switching circuit sets the power transmission resonant circuit to the resonant state by setting the first switch to the on state and setting the second switch to the off state, and sets the power transmission resonant circuit to the non-resonant state by setting the first switch to the off state and setting the second switch to the on state, a non-contact power supply device.

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