Non-contact power supply device

Abstract

A non-contact power supply device (10) is provided with a power transmission resonance circuit (42), a switching circuit (44), and a cell control unit (46) for controlling the switching circuit, and the cell control unit performs at least one of a first abnormality determination process and a second abnormality determination process. The first abnormality determination process determines whether or not the non-contact power supply device is abnormal using a first detection value detected by the detection unit in a non-resonant state, and the second abnormality determination process determines whether or not the non-contact power supply device is abnormal using a second detection value detected by the detection unit in a resonant state.

Description

[0001] Reference to Related Applications

[0002] This application is based on Japanese Patent Application No. 2023-80774 filed on May 16, 2023, the contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to a non-contact power supply device. BACKGROUND

[0004] Patent Literature 1 discloses a technique of determining that a non-contact power supply device has failed when an induced current flowing in a power receiving coil that receives non-contact power from the non-contact power supply device is below a first threshold value.

[0005] Prior Art Documents Patent Literature

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2022-76657 SUMMARY

[0007] However, it is inconvenient that a failure is found only at the time of power reception, and power cannot be received, and thus a technique of determining a failure early is needed.

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

[0009] Provided in one embodiment of the present disclosure is a non-contact power feeding device that non-contact power feeds a power receiving device having a secondary coil. The non-contact power feeding device includes a power feeding resonant circuit having a primary coil and a primary capacitor that can be magnetically coupled with the secondary coil, an alternating-current power source that supplies alternating-current power of a predetermined operating frequency to the power feeding resonant circuit, a switching circuit for switching a state of the power feeding resonant circuit between a resonant state and a non-resonant state, a detection section for directly or indirectly detecting a current value of a current flowing through the primary coil, and a unit control section that controls the switching circuit. The unit control section performs at least either of a first abnormality judgment process that judges whether or not the non-contact power feeding device is abnormal using a first detection value detected by the detection section in the non-resonant state, and a second abnormality judgment process that judges whether or not the non-contact power feeding device is abnormal using a second detection value detected by the detection section in the resonant state, performs a first judgment step that judges whether or not the first detection value is outside a predetermined first reference range, and a first abnormality judgment step that judges abnormality when judged to be outside the first reference range in the first judgment step, in the first abnormality judgment process, performs a second judgment step that judges whether or not the second detection value is outside a predetermined second reference range, and a second abnormality judgment step that judges abnormality when judged to be outside the second reference range in the second judgment step, in the second abnormality judgment process.

[0010] According to this embodiment, in the non-contact power feeding device, at least either of the first abnormality judgment process and the second abnormality judgment process is performed, and thus it is possible to judge abnormality early. Therefore, it is possible to judge a failure of the non-contact power feeding device early. BRIEF DESCRIPTION OF DRAWINGS

[0011] The above objects, other objects, features, and advantages of the present disclosure will become more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0012] Figure 1 is a schematic configuration diagram of the non-contact power feeding system of the first embodiment.

[0013] Figure 2 is a circuit diagram of the non-contact power feeding system of the first embodiment.

[0014] Figure 3 is a flowchart of the power feeding sequence.

[0015] Figure 4 is a flowchart of the abnormality detection process of the first embodiment.

[0016] Figure 5 is a circuit diagram of the non-contact power supply system of the second embodiment.

[0017] Figure 6 is a first correspondence table of the second embodiment of the failure and the change in the detection value.

[0018] Figure 7 is a second correspondence table of the second embodiment of the failure and the change in the detection value.

[0019] Figure 8 is a graph showing the current value of each coil at the normal time of each state of the second embodiment.

[0020] Figure 9 is a flowchart of the abnormality detection process of the second embodiment.

[0021] Figure 10 is a circuit diagram of the non-contact power supply device of the third embodiment.

[0022] Figure 11 is a graph showing the current value of each coil at the normal time of each state of the third embodiment.

[0023] Figure 12 is a first correspondence table of the third embodiment of the failure and the change in the detection value.

[0024] Figure 13 is a second correspondence table of the third embodiment of the failure and the change in the detection value.

[0025] Figure 14 is a third correspondence table of the third embodiment of the failure and the change in the detection value.

[0026] Figure 15 is a flowchart of the first half of the abnormality detection process of the third embodiment.

[0027] Figure 16 is a flowchart of the second half of the abnormality detection process of the third embodiment.

[0028] Figure 17 is a circuit diagram of the non-contact power supply device of the fourth embodiment.

[0029] Figure 18 is a first correspondence table of the fourth embodiment of the failure and the change in the detection value.

[0030] Figure 19 is a second correspondence table of the fourth embodiment of the failure and the change in the detection value.

[0031] Figure 20 is a circuit diagram of the non-contact power supply device of the fifth embodiment. DETAILED DESCRIPTION

[0032] A. First Embodiment A1. Structure of Non-contact Power Supply System As shown in FIG. 1, a non-contact power supply system 1 includes a non-contact power feeding device 10 and a power receiving device 80. In the present embodiment, the non-contact power feeding device 10 is buried under a road RS. The power receiving device 80 is attached to a vehicle VE as a mobile body that travels on the road RS. The power receiving device 80 is supplied with power from the non-contact power feeding device 10 in traveling of the vehicle VE. Here, the traveling includes a case where the vehicle VE moves and a case where the vehicle stops due to waiting for a signal or the like. The vehicle VE is configured as an electric vehicle or a hybrid vehicle, for example. Figure 1

[0033] The non-contact power feeding device 10 has a power feeding unit 40 having a power feeding coil L1 as a primary coil, and an alternating-current power source 11 that supplies power to the power feeding unit 40. The alternating-current power source 11 supplies alternating-current power of a predetermined operating frequency to a plurality of power feeding units 40. Specifically, the alternating-current power source 11 includes a direct-current power source that converts alternating-current power supplied from a system power source into direct-current power, and a DC / AC conversion device that converts the direct-current power supplied from the direct-current power source into alternating-current power of the operating frequency. The plurality of power feeding coils L1 are arranged in the extension direction of the road RS.

[0034] In addition, the mobile body to which the power receiving device 80 is attached is not limited to the vehicle VE that travels on the road RS, and can be an AGV (automated guided vehicle), a traveling robot, or the like, for example. Furthermore, the power feeding unit 40 can not be provided under the road RS, but can be provided on a sidewalk or a parking lot adjacent to the road RS, or a path on which an AGV travels. In addition, the configuration can be such that one power feeding unit 40 is connected to the alternating-current power source 11.

[0035] 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 portion 96. The power receiving coil L2 is capable of magnetic coupling with the power feeding coil L1. In the present embodiment, the power receiving coil L2 is provided at a position opposite to the power feeding coil L1, that is, a lower surface of the vehicle VE.

[0036] 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 direct-current power. The power that charges the battery 84 can be used as a driving force for traveling or the like.

[0037] The power receiving side control portion 96 controls each portion in the power receiving device 80, such as the power receiving resonant circuit 81. The power receiving side control portion 96 is implemented by including an ECU (engine control unit). In addition, the ECU can be implemented by one microcontroller, or can be implemented by including a plurality of microcontrollers.​

[0038] A2. Circuit structure of contactless power supply system: like Figure 2 As shown, in addition to the above-described structure, the power transmission unit 40 also includes a power transmission resonant circuit 42, a switching circuit 44, and a unit control unit 46. The power transmission resonant circuit 42 includes: a power transmission coil L1; a power transmission capacitor C1 serving as a primary capacitor; and a first switch SW1. The power transmission capacitor C1 functions to make the power transmission resonant circuit 42 resonant at the operating frequency and to make the power transmission resonant circuit 42 non-resonant at the operating frequency. The power transmission capacitor C1 includes a first power transmission capacitor C11 and a second power transmission capacitor C12.

[0039] The switching circuit 44 switches the state of the power supply 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 implemented, for example, by a microcontroller. The abnormality detection and handling program, described later, is stored in the memory of the unit control unit 46.

[0040] The first power supply capacitor C11 is connected in series with the power supply coil L1. The second power supply capacitor C12 is connected in series with the first switch SW1. Furthermore, the connection between the second power supply capacitor C12 and the first switch SW1 is connected in parallel with the first power supply capacitor C11. The first switch SW1 is a bidirectional switch connecting the source terminals of two FETs (Field Effect Transistors). The switching signal Sig1 output from the switching circuit 44 is input to the gate terminals of the two FETs. This controls the on / off state of the first switch SW1.

[0041] When a high-level switching signal Sig1 is input to the first switch SW1, the first switch SW1 becomes closed, i.e., conducts, and current flows through the second power supply capacitor C12. Here, the combined capacitance of the first power supply capacitor C11 and the second power supply capacitor C12, as well as the inductance of the power supply coil L1, are set to a value that resonates at the operating frequency when the power supply coil L1 and the receiving coil L2 are magnetically coupled. Thus, when the first switch SW1 is closed, the power supply resonant circuit 42 resonates through the first power supply capacitor C11, the second power supply capacitor C12, and the power supply coil L1. Conversely, when a low-level switching signal Sig1 is input to the first switch SW1, the first switch SW1 becomes open, i.e., non-conducting. Furthermore, since the resonant frequency of the resonant circuit formed by the first power supply capacitor C11 and the power supply coil L1 deviates from the operating frequency, the power supply resonant circuit 42 becomes non-resonant.

[0042] The power transmitting unit 40 also has a first current sensor 51 as a detection section for directly or indirectly detecting a current value of a current flowing through the power transmitting coil Ll, 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 Ll, and transmits a signal indicating the detected current value to the unit control section 46.

[0043] Here, indirectly detecting a current value of a current flowing through the power transmitting coil Ll specifically means detecting, for example, a voltage value of the power transmitting coil Ll, a magnetic flux density in the vicinity of the power transmitting coil Ll, or a voltage of the first power transmitting capacitor Cll. The larger the current value of the current flowing through the power transmitting coil Ll, the larger the voltage value of the power transmitting coil Ll. Therefore, the voltage value of the power transmitting coil Ll can be converted into the current value of the current flowing through the power transmitting coil Ll. The larger the current value of the current flowing through the power transmitting coil Ll, the larger the current density in the vicinity of the power transmitting coil Ll. Therefore, the magnetic flux density in the vicinity of the power transmitting coil Ll can be converted into the current value of the current flowing through the power transmitting coil Ll. Therefore, in order to detect the current value of the power transmitting coil Ll, instead of the first current sensor 51, a voltage sensor that detects a voltage value of the power transmitting coil Ll or a magnetic sensor that detects a magnetic flux density in the vicinity of the power transmitting coil Ll can be used as the detection section.

[0044] The magnetic sensor 52 is built-in with a detection coil Lsp. The detection coil Lsp is arranged in the vicinity of the power transmitting coil Ll. The magnetic sensor 52 detects a magnetic flux density in the vicinity of the power transmitting coil Ll, and transmits a detection value indicating the detected magnetic flux density to the unit control section 46. In the present embodiment, the magnetic sensor 52 is built-in with a voltage sensor that detects a voltage induced by the detection coil Lsp. The larger the detected magnetic flux density, the larger the voltage value detected by the magnetic sensor 52.

[0045] The power receiving device 80 has a power receiving resonant circuit 81 that is a series resonant circuit having a power receiving coil L2 and a power receiving capacitor C2.

[0046] A3. Power supply sequence: The power transmitting coil Ll is arranged along the extension direction of the road RS, and the power receiving coil L2 receives non-contact power supply from the nearest power transmitting coil Ll. The power transmitting unit 40 is set to either of a standby state and a power supply state. Specifically, when set to the standby state, the unit control section 46 commands the switching circuit 44 to set the first switch SWl to the off state, thereby setting the power transmitting resonant circuit 42 to the non-resonant state. In contrast, when set to the power supply state, the unit control section 46 commands the switching circuit 44 to set the first switch SWl to the on state, thereby setting the power transmitting resonant circuit 42 to the resonant state. The standby current flowing through the power transmitting coil Ll in the standby state is smaller than the power supply current flowing through the power transmitting coil Ll in the power supply state.

[0047] The power transmitting unit 40 is set to the standby state at start-up. Then, when the approach of the power receiving coil L2 is detected, the power transmitting unit 40 switches from the standby state to the power supply state, and supplies power to the power receiving coil L2. The power supply sequence is performed using Figure 3 The power supply sequence showing details of the switching between the standby state and the power supply state is described.

[0048] The power transmitting unit 40 is set to the standby state at start-up. The power transmitting unit 40 generates magnetic flux from the power transmitting coil L1 by causing a standby current to flow through the power transmitting coil L1 in the standby state. When the power receiving coil L2 approaches the power transmitting coil L1, the power receiving device 80 detects the magnetic flux generated from the power transmitting coil L1 using a secondary-side detection circuit not shown. The power receiving device 80 generates a start-up magnetic flux upon detecting the magnetic flux generated from the power transmitting coil L1. Specifically, the power receiving device 80 applies AC power to a magnetic flux generating coil not shown. Thus, the magnetic flux generating coil generates magnetic flux. The detection value of the magnetic sensor 52 becomes large due to the generated magnetic flux, and becomes larger than a predetermined reference value.

[0049] The unit control section 46 determines that the power receiving coil L2 is located in the vicinity of the power transmitting coil L1 when the detection value of the magnetic sensor 52 is larger than the first reference value. In contrast, the unit control section 46 determines that the power receiving coil L2 is not located in the vicinity of the power transmitting coil L1 when the detection value of the magnetic sensor 52 is equal to or smaller than the second reference value. Note that the first reference value and the second reference value can be either the same value or different values. In the following description, the case where the unit control section 46 determines that the power receiving coil L2 is located in the vicinity of the power transmitting coil L1 is sometimes simply referred to as "the approach case of the power receiving coil L2". The case where the unit control section 46 determines that the power receiving coil L2 is not located in the vicinity of the power transmitting coil L1 is sometimes simply referred to as "the disengagement case of the power receiving coil L2".

[0050] The unit control section 46 determines that the power receiving coil L2 is located in the vicinity of the power transmitting coil L1 when the detection value of the magnetic sensor 52 is larger than the first reference value. In contrast, the unit control section 46 determines that the power receiving coil L2 is not located in the vicinity of the power transmitting coil L1 when the detection value of the magnetic sensor 52 is equal to or smaller than the second reference value. Note that the first reference value and the second reference value can be either the same value or different values. In the following description, the case where the unit control section 46 determines that the power receiving coil L2 is located in the vicinity of the power transmitting coil L1 is sometimes simply referred to as "the approach case of the power receiving coil L2". The case where the unit control section 46 determines that the power receiving coil L2 is not located in the vicinity of the power transmitting coil L1 is sometimes simply referred to as "the disengagement case of the power receiving coil L2". Figure 3 The unit control section 46 sets the power transmitting resonant circuit 42 to the resonant state in step S3 when the unit control section 46 determines that the power receiving coil L2 is located in the vicinity of the power transmitting coil L1 in step S1. Specifically, the unit control section 46 instructs the switching circuit 44 to switch the first switch SW1 from the off state to the on state using the switching signal Sigl. In the case where 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. Thus, the power receiving coil L2 can be non-contact powered by the magnetic field resonant coupling between the power transmitting coil L1 and the power receiving coil L2.

[0051] The unit control section 46 determines that the power receiving coil L2 is not located in the vicinity of the power transmitting coil Ll in step S5, and sets the power transmitting resonant circuit 42 to the non-resonance state. Specifically, the unit control section 46 instructs the switching circuit 44 to switch the first switch SWl from the on state to the off state using the switching signal Sigl. Thus, the power supply is stopped, and the power transmitting unit 40 is set to the standby state.

[0052] A4. Abnormality detection processing: After the power transmitting unit 40 is started, the unit control section 46 starts Figure 4 the abnormality detection processing shown in FIG. 8. In step S10, the unit control section 46 determines whether the power receiving device 80 is present in the power supplyable position range. Specifically, the unit control section 46 determines that the power receiving device 80 is not present in the power supplyable range when the detection value of the magnetic sensor 52 is equal to or less than a predetermined first reference value. In contrast, the unit control section 46 determines that the power receiving device 80 is present in the power supplyable range when the detection value of the magnetic sensor 52 is greater than the first reference value. The determination of whether an abnormality has occurred is performed in a state in which the power receiving coil L2 is not present in the power supplyable position range. Therefore, when it is determined in step S10 that the power receiving device 80 is present in the power supplyable position range, the unit control section 46 repeatedly executes step S10 until it is determined that the power receiving device 80 is not present.

[0053] When it is determined in step S10 that the power receiving device 80 is not present in the power supplyable range, the unit control section 46 acquires the detection value of the first current sensor 51 in step S14. In addition, since the state of the power transmitting unit 40 has not been changed from the non-resonance state, the detection value of the first current sensor 51 acquired in step S14 is the detection value in the non-resonance state.

[0054] In step S20, the unit control section 46 determines whether the acquired current value is outside a predetermined reference range. Specifically, the reference range refers to a range equal to or less than a predetermined reference value. Moreover, the unit control section 46 determines that the acquired current value is outside the reference range when the acquired current value is greater than the reference value. On the other hand, the unit control section 46 determines that the acquired detection value is not outside the reference range, i.e., is within the reference range, when the acquired detection value is equal to or less than the reference value.

[0055] The power transmission unit 40 is set to the standby state, and thus, a standby current flows through the power transmission coil Ll in the normal state in which no failure occurs in the power transmission resonant circuit 42. Therefore, in a case where the current flowing through the power transmission coil Ll is larger than that in the normal state, it is determined that a failure occurs in the power transmission resonant circuit 42. Specifically, the failure in this case can be considered to be a short-circuit failure of the first switch SWl and a short-circuit failure of the first power transmission capacitor Cll. Here, the short-circuit failure means a failure that is always in the on state. Such a failure causes unnecessary magnetic flux to be generated in the power transmission coil Ll, and thus, it is preferable to detect the failure as early as possible.

[0056] The reference value used in step S20 is a value larger than the standby current in the normal state, and is determined in advance through experiments or the like.

[0057] When it is determined in step S20 that the detected value is not outside the reference range, the unit control section 46 determines that the power transmission unit 40 is normal in step S22, and sets the power transmission unit 40 to the power feeding permission state. The power feeding permission state means a state in which the power feeding sequence can be executed. On the other hand, when it is determined in step S20 that the detected value is outside the reference range, the unit control section 46 determines that the power transmission unit 40 is abnormal in step S24, and sets the power transmission unit 40 to the power feeding prohibition state. The power feeding prohibition state means a state in which the power feeding sequence cannot be executed. In the power feeding prohibition state, the power transmission unit 40 is always set to the standby state. The unit control section 46 ends the present processing sequence after executing step S22 and after executing step S24.

[0058] The detected value acquired by the unit control section 46 in step S14 is also referred to as a first detected value. Step S20 is also referred to as a first determination step. Step S24 is also referred to as a first abnormality determination step. Step S20 and step S24 are also collectively referred to as a first abnormality determination process.

[0059] According to the first embodiment described above, the unit control section 46 acquires the detected value in the non-resonant state in step S14, and determines whether the detected value is outside the reference range in step S20, thereby determining whether the non-contact power feeding apparatus 10 is abnormal, that is, whether a failure occurs. Thus, it is possible to determine in advance whether a failure occurs in the non-contact power feeding apparatus 10 at a period different from the power feeding operation, and it is possible to determine a failure in the non-contact power feeding apparatus 10 as early as possible.

[0060] In addition, the unit control section 46 performs the abnormality detection process at the time of startup, that is, before the standby state is switched to the power feeding state after the startup. Thus, it is possible to avoid the switching from the standby state to the power feeding state in a state where a failure occurs in the non-contact power feeding apparatus 10.

[0061] B. Second Embodiment: Figure 5The non-contact power feeding device 210 of the present embodiment shown differs from the first embodiment described above in the circuit structure of the power feeding control device 60, the power feeding unit 240, and the processing content of the abnormality detection process. The same symbols are affixed to the same structures and the same processing steps as those of the first embodiment described above, and detailed description is appropriately omitted.

[0062] B1. Circuit structure of non-contact power feeding system As Figure 5 shown, the power feeding unit 240 has a coupling circuit 48. The coupling circuit 48 functions to establish or cut off the power transmission path of the power feeding 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 identical to the first switch SW1. The tertiary coil L3 is disposed at a position capable of magnetic coupling with the power feeding coil L1. Thus, in the case where the power feeding coil L1 and the power receiving coil L2 are magnetically coupled, the power feeding coil L1, the power receiving coil L2, and the tertiary coil L3 are magnetically coupled with each other.

[0063] The capacitance value of the tertiary capacitor C3 is set to a value that causes the parallel resonance circuit formed by the tertiary coil L3 and the tertiary capacitor C3 to be in a resonant state when the power feeding coil L1, the power receiving coil L2, and the tertiary coil L3 are magnetically coupled with each other.

[0064] The power receiving device 80 is mounted on a mobile body as in the first embodiment, and in the case where the power receiving coil L2 approaches the power feeding coil L1, the unit control section 46 switches the power feeding resonance circuit 42 and the coupling circuit 48 from the non-resonant state to the resonant state, and switches the power feeding unit 40 from the standby state to the power feeding state. Specifically, as described above, the switching circuit 44 switches the first switch SW1 from the off state to the on state, and switches the second switch SW2 from the on state to the off state. When the second switch SW2 is switched to the off state, the parallel resonance circuit formed by the tertiary coil L3 and the tertiary capacitor C3 is in the resonant state. Thus, the power feeding current flows through the power feeding coil L1, and the power receiving coil L2 is subjected to non-contact power feeding.

[0065] Conversely, when the receiving coil L2 is disconnected, the unit control unit 46 switches the power supply resonant circuit 42 and the coupling circuit 48 from a resonant state to a non-resonant state, and switches the power supply 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, the two terminals of the three-stage coil L3 are short-circuited, so the coupling circuit 48 becomes a non-resonant state. As a result, the power supply unit 40 switches to a standby state where a standby current smaller than the supply current flows through the power supply coil L1.

[0066] The power supply coils L1 are arranged in a grid, and the receiving coil L2 receives power from the nearest power supply coil L1 in the grid. That is, the multiple power supply coils L1 are sequentially switched from standby to power supply state according to their configuration order. Therefore, it is possible for the magnetic flux generated by the power supply coil L1 of a power supply unit 40 set to power supply state to pass through the power supply coil L1 of an adjacent power supply unit 40 set to standby state. Here, by setting the coupling circuit 48 to a non-resonant state, the standby current flowing through the power supply coil L1 can be reduced.

[0067] Furthermore, in standby mode, the coupling circuit 48 also functions as a magnetic sensor to detect the proximity of the energized coil L2. In standby mode, the second switch SW2 is set to the ON state; therefore, the current induced by the tri-electrode coil L3 flows through the ON-state second switch SW2. The current flowing through the tri-electrode coil L3 can be detected by the second current sensor 54, described later. In the first embodiment, in the power supply sequence... Figure 3 In step S1, a magnetic sensor 52 is used. In contrast, in this embodiment, the approach of the energized coil L2 in the power supply sequence is detected using a second current sensor 54. The disengagement of the energized coil L2 in the power supply sequence is detected using a first current sensor 51. Alternatively, in this embodiment, the approach and disengagement of the energized coil L2 can also be detected using a magnetic sensor 52, as in the first embodiment. As described later, the detection value of the second current sensor 54 is used for anomaly detection processing. That is, the second current sensor 54, used to detect the approach of the energized coil L2, can be used for anomaly detection processing. Therefore, anomaly detection processing can be performed without adding a new sensor.

[0068] The power transmitting unit 240 includes, in addition to the first current sensor 51 and the magnetic sensor 52, a voltage sensor 53 and a second current sensor 54. The voltage sensor 53 detects a voltage value of the second power transmitting capacitor C12, and transmits a signal representing the detected voltage value to the unit control section 46. The second current sensor 54 directly detects a current value of the current flowing through the tertiary coil L3, and transmits a signal representing the detected current value to the unit control section 46. In the present embodiment, the voltage sensor 53, the second current sensor 54, the second current sensor 54, and the magnetic sensor 52 are used for the abnormality detection process in addition to the first current sensor 51. 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.

[0069] The power transmitting control device 60 is capable of communicating with each power transmitting unit 240. Specifically, the power transmitting control device 60 is capable of communicating with the unit control section 46. The power transmitting control device 60 is realized by, for example, a microcontroller.

[0070] B2. Outline of Abnormality Judgment Process Figure 6 and Figure 7 is a table in which the failure site and the change in each detection value are summarized. Specifically, the change in the detection value represents the change in the detection value at the time of abnormality with respect to the detection value at the time of normality. "Increase" in the table represents that the detection value at the time of abnormality after the failure has become larger with respect to the detection value at the time of normality without the failure. "Decrease" in the table represents that the detection value has become smaller with respect to the time of normality. "-" in the table represents that there is no change or the amount of change is small with respect to the time of normality. Further, "I (LI)" in the table represents the current value of the first current sensor 51. "I (L3)" in the table represents the current value of the second current sensor 54. "V (C12)" in the table represents the voltage value of the voltage sensor 53. "φ (LI)" in the table represents the magnetic flux density represented by the voltage value of the magnetic sensor 52.

[0071] In the present embodiment, the power transmitting resonant circuit 42 has the coupling circuit 48 in addition thereto, and thus the standby state and the power supply state of the power transmitting unit 240 are used instead of the state of the resonant state and the non-resonant state of the power transmitting resonant circuit 42. Further, the correspondence relationship between the resonant state and the non-resonant state of each of the power transmitting resonant circuit 42 and the coupling circuit 48 and the standby state and the power supply state of the power transmitting unit 240 is as described above.

[0072] In the standby state, both the power transmitting resonant circuit 42 and the coupling circuit 48 are set to the non-resonant state. Thus, as Figure 8As shown, the current flowing through the power transmission coil Ll and the current flowing through the tertiary coil L3 are both small. In the power supply state, both the power transmission resonance circuit 42 and the coupling circuit 48 are set to the resonance state. Even at the normal time, the current value flowing through the power transmission coil Ll is different from the current value flowing through the tertiary coil L3. In addition, for the power transmission coil Ll, the current value in the standby state is different from the current value in the power supply state. Therefore, the reference values used in the abnormality detection process are set for each detection value and each state of the standby state and the power supply state in various combinations.

[0073] The change in the detection value at the time of a short-circuit failure of the first switch SWl, other than a failure of the circuit elements other than the first switch SWl, will be described as an example. As shown in FIG. 6, 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 with respect to the normal time when the first switch SWl has a short-circuit failure. Figure 6

[0074] In the standby state, the first switch SWl is set to the off state, and therefore, in the normal time, a standby current smaller than the power supply current flows through the power transmission coil Ll, as described above. However, when the first switch SWl has a short-circuit failure, the state of the power transmission resonance circuit 42 becomes approximately the same state as in the power supply state, and therefore, a current of the same degree as the power supply current flows through the power transmission coil Ll, and the detection value of the first current sensor 51 increases. Also, the current flowing through the power transmission coil Ll increases, and therefore, the current flowing through the magnetically coupled tertiary coil L3 also increases. Therefore, the detection value of the second current sensor 54 also increases. The current flowing through the second power transmission capacitor C12 connected in series to the power transmission coil Ll also increases, and therefore, the detection value of the voltage sensor 53 also increases. The current flowing through the power transmission coil Ll increases, and therefore, the current flowing through the magnetically coupled detection coil Lsp also increases. Therefore, the detection value of the magnetic sensor 52 also increases.

[0075] On the other hand, in the power supply state, even in the case where the first switch SWl has a short-circuit failure, the detection values do not greatly change. This is because, in the power supply state, the first switch SWl is set to the on state, and therefore, there is little difference from the case where the first switch SWl has a short-circuit failure.

[0076] ​When the first switch SW1 experiences an open-circuit fault, in the power-on state, the state of the power-transmitting resonant circuit 42 becomes approximately the same as the normal standby state. Therefore, 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. Conversely, when the first switch SW1 experiences an open-circuit fault, in the standby state, the first switch SW1 is set to the open state, so there is not much difference from the situation when the first switch SW1 experiences an open-circuit fault.

[0077] As described above, in addition to the standby state, the detection values ​​are also used in the power-on state, thereby enabling the detection of faults that cannot be detected by 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-on state, the faulty circuit component can be identified, and fault modes such as short circuit faults or open circuit faults can be determined.

[0078] Figure 6 "C decreases" means that the capacitance of the capacitor decreases. Figure 7 "L increases" indicates an increase in the inductance of the coil. Figure 7 "L decreases" indicates that the inductance of the coil is reduced. Figure 7 The terms “foreign objects (metals, etc.)” and “foreign objects (magnetic materials, etc.)” will be described later.

[0079] B3. Details of anomaly detection and handling: like Figure 9 As shown, when the unit control unit 46 determines in step S10 that there is no powered receiving device 80 within the power supply range, the process proceeds to step S14. When a powered receiving coil L2 exists within the range where it can magnetically couple with the power supply coil L1, the current flowing through the power supply coil L1 varies depending on the degree of coupling between the power supply coil L1 and the powered receiving coil L2. Therefore, by determining whether there is an anomaly when it is determined that there is no powered receiving device 80 within the power supply range, the anomaly determination can be performed with high accuracy.

[0080] In step S14, the unit control unit 46 acquires each detection value in the standby state and stores the acquired detection values ​​in its built-in memory. Here, each detection value represents 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 supply unit 240 to the power supply state. In step S18, the unit control unit 46 acquires each detection value and stores the acquired detection values ​​in its built-in memory.

[0081] In step S20, it is determined whether the detection value in the standby state is outside the 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 of subsequent 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.

[0082] Specifically, step S20 is performed by comparing the detection value, a lower limit reference value, and an upper limit reference value, which are determined in advance, for each of the four detection values. In a case where the detection value is less than the lower limit reference value and a case where the detection value is greater than the upper limit reference value, it is determined that the first reference range is outside. In contrast, in a case where the detection value is equal to or greater than the lower limit reference value and equal to or less than the upper limit reference value, it is determined that the first reference range is not outside, that is, the first reference range is inside.

[0083] In addition, the case where the detection value is less than the lower limit reference value corresponds to "decrease" in Figure 6 and Figure 7 The case where the detection value is greater than the upper limit reference value corresponds to "increase" in Figure 6 and Figure 7 The case where the detection value is equal to or greater than the lower limit reference value and equal to or less than the upper limit reference value corresponds to "-" in Figure 6 and Figure 7

[0084] The unit control section 46 determines whether each of the four detection values is outside the first reference range, and in a case where at least one of the four detection values is determined to be outside the first reference range, it is determined in step S20 that the first reference range is outside. In contrast, in a case where all of the four detection values are determined to be inside the first reference range, that is, the first reference range is inside, the unit control section 46 determines in step S20 that the first reference range is not outside.

[0085] When it is determined in step S20 that the detection value in the standby state is not outside the first reference range, the unit control section 46 determines in step S21 whether the detection value in the power supply state is inside the second reference range. Specifically, as in step S20, the detection value and the second reference range are compared for each of the four detection values, and in a case where at least one of the four detection values is outside the second reference range, it is determined in step S21 that the second reference range is outside. On the other hand, the detection values are compared with the second reference range, and in a case where all of the four detection values are not outside the second reference range, that is, the second reference range is inside, the unit control section 46 determines in step S21 that the second reference range is not outside.

[0086] ​When it is determined in step S21 that the detected value in the power supply state is not outside the second reference range, since the detected value is within the reference range in either of the standby state and the power supply state, the unit control section 46 determines in step S22 that the power transmission unit 40 is normal, sets the power supply permission state, and ends the present processing routine.

[0087] When it is determined in step S21 that the detected value in the power supply state is outside the second reference range, since the detected value in the standby state is outside the first reference range, which is abnormal, the unit control section 46 causes the processing to proceed to step S38.

[0088] When it is determined in step S20 that the detected value in the standby state is outside the first reference range, the unit control section 46 determines in step S24 that there is an abnormality, and sets the power transmission unit 240 to the power supply prohibition state. In step S32, the unit control section 46 transmits a first abnormality notification signal indicating that an abnormality is determined in the standby state to the power transmission control device 60.

[0089] In step S34, as in step S21, the unit control section 46 determines whether the detected value in the power supply state is outside the second reference range. When it is determined that the detected value in the power supply state is not outside the second reference range, the unit control section 46 ends the present processing routine. In contrast, when it is determined that the detected value in the power supply state is outside the second reference range, the unit control section 46 determines in step S38 that there is an abnormality, and sets the power transmission unit 240 to the power supply prohibition state. In step S40, the unit control section 46 transmits a second abnormality notification signal indicating that an abnormality is determined in the power supply state to the power transmission control device 60, and ends the present processing routine after setting the power transmission unit 240 to the power supply prohibition state.

[0090] In step S18, the detected value acquired by the unit control section 46 is also referred to as a second detected value. Step S21 and step S34 are also referred to as second determination steps. Step S38 is also referred to as a second abnormality determination step. Step S34 and step S38 are collectively referred to as a second abnormality determination processing. Step S10 is also referred to as a power reception device determination step.

[0091] The second embodiment described above achieves the same effect as the first embodiment. Furthermore, when the unit control unit 46 determines an abnormality in step S24, it sends a first abnormality notification signal to the power supply control device 60 in step S32. When the unit control unit 46 determines an abnormality in step S38, it sends a second abnormality notification signal to the power supply control device 60 in step S40. Therefore, the power supply control device 60 can perform corresponding processing when it receives at least one of the first and second abnormality notification signals. For example, it can stop the power supply from the AC power source 11 to the power supply unit 240. Thus, for example, by generating magnetic flux from the power supply unit 240, secondary faults can be suppressed. Additionally, for example, it can prompt the manager of the contactless power supply device 10 to repair the fault.

[0092] Furthermore, when the unit control unit 46 determines in step S10 that the power receiving device 80 is not located within the range where non-contact power supply is possible, it performs steps S20 and S34 to compare the detected value with a reference range. This allows for highly accurate determination of whether an anomaly has occurred.

[0093] C. Other methods of the second implementation: In this embodiment, the unit control unit 46 is in Figure 9 Following step S24, a fourth, fifth, and sixth judgment steps are performed. The fourth judgment step determines whether the detection value of the voltage sensor 53 is outside a predetermined first reference voltage range; the fifth judgment step determines whether the detection value of the second current sensor 54 is outside a predetermined first reference current range; and the sixth judgment step determines whether the detection value of the magnetic sensor 52 is outside a predetermined first reference magnetic flux range. Then, if the unit control unit 46 determines in the fourth judgment step that the detection value of the voltage sensor 53 is outside the first reference voltage range, in the fifth judgment step that the detection value of the second current sensor 54 is outside the first reference current range, and in the sixth judgment step that the detection value of the magnetic sensor 52 is outside the first reference magnetic flux range, it determines that a short circuit fault has occurred in the first switch SW1. According to this method, it is possible to determine that the fault is a short circuit fault in the first switch SW1.

[0094] In addition, the first reference voltage range, the first reference current range, and the first reference voltage range are predetermined through experiments, etc.

[0095] Furthermore, when a short-circuit fault is detected in the first switch SW1, the unit control unit 46 can also send a notification signal indicating that a short-circuit fault has occurred in the first switch SW1 to the power supply control device 60. By sending the notification signal, for example, the manager of the contactless power supply device 10 can pre-determine the location of the fault, and thus be able to repair the contactless power supply device 10 as soon as possible.

[0096] D. Other methods of the second implementation: In this embodiment, after step S38, the unit control unit 46 performs a seventh judgment step, an eighth judgment step, and a ninth judgment step. The seventh judgment step determines whether the detection value of the voltage sensor 53 is outside a predetermined second reference voltage range; the eighth judgment step determines whether the detection value of the second current sensor 54 is outside a predetermined second reference current range; and the ninth judgment step determines whether the detection value of the magnetic sensor 52 is outside a predetermined second reference magnetic flux range. Then, if the unit control unit 46 determines in the seventh judgment step that the detection value of the voltage sensor 53 is outside the second reference voltage range, in the eighth judgment step that the detection value of the second current sensor 54 is outside the second reference current range, and in the ninth judgment step that the detection value of the magnetic sensor 52 is outside the second reference magnetic flux range, it determines that the power transmission resonant circuit 42 has malfunctioned. According to this method, a malfunction in the power transmission resonant circuit 42 can be determined. By determining the location of the malfunction, the same effect as described in "another method 1 of the second embodiment" can be achieved.

[0097] E. Other aspects of the second implementation: This implementation corresponds to Figure 7 The terms "foreign objects (such as metals)" and "foreign objects (such as magnetic materials)" refer to the presence of foreign objects. When foreign objects such as metals or magnetic materials adhere to the vicinity of the power transmission coil L1, the inductance of the power transmission coil L1 and the inductance of the three-stage coil L3 magnetically coupled to the power transmission coil L1 will change. Therefore, the detection value under power supply conditions will change.

[0098] However, the change in detection value is smaller when foreign matter adheres compared to a circuit component malfunction. Therefore, in this embodiment, if the change in detection value is relatively small, it is determined that the malfunction is caused by a foreign matter; if the change in detection value is relatively large, it is determined that the malfunction is caused by a circuit component. Specifically, in this embodiment, Figure 9 The second reference range in steps S21 and S34 is used to determine whether the fault is caused by a foreign object. Furthermore, a circuit reference range larger than the second reference range is used to determine whether the fault is caused by a circuit component.

[0099] If the unit control unit 46 determines in step S34 that the detected value is outside the second reference range, it performs a third determination step. This third determination step determines whether the value is outside a circuit reference range that is larger than the second reference range. Then, if the unit control unit 46 determines in the third determination step that the value is outside the circuit reference range, it determines that there is a circuit malfunction in the contactless power supply device 210. Conversely, if the unit control unit 46 determines in the third determination step that the value is not outside the circuit reference range, it determines that there is a foreign object malfunction in the contactless power supply device 210.

[0100] According to this mode, it is possible to distinguish which of the circuit element and the foreign matter is the cause of the failure. By determining whether the failure site is the circuit element or the foreign matter, it is possible to achieve the same effect as the above-described "Other Mode 1 of the Second Embodiment".

[0101] In addition, Figure 7 "increased / decreased" means that the current value is sometimes increased and sometimes decreased with respect to the normal time depending on the magnitude relationship with the inductance of the power transmitting coil Ll and the power receiving coil L2.

[0102] F. Third Embodiment: Figure 10 In the power transmitting unit 340 of the present embodiment, the circuit structure of the coupling circuit 348 is different from that of the coupling circuit 48 of the second embodiment. In addition, the processing content of the abnormality judgment processing is different from that of the second embodiment. The same symbols are attached to the same structures and the same processing steps as those of the above-described respective embodiments, and detailed description is appropriately omitted.

[0103] F1. Circuit structure of the non-contact power feeding device: The coupling circuit 348 of the present 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 SWl and the second power transmitting capacitor C12 of the power transmitting resonance circuit 42. That is, the additional capacitor C4 is connected in series with the third switch SW3, and the connection body of the additional capacitor C4 and the third switch SW3 is connected in parallel with the tertiary capacitor C3. By switching the state of the third switch SW3 between the off state and the on state, the capacitance value of the LC parallel resonance circuit including the tertiary coil L3 is changed. Specifically, when the coupling circuit 348 is set to the resonance state, the second switch SW2 is set to the off state, and the third switch SW3 is set to the on state. In contrast, when the coupling circuit 348 is set to the non-resonance state, the second switch SW2 is set to the off state, and the third switch SW3 is set to the off state. In the coupling circuit 348, the non-resonance state can be set using the third switch SW3 in addition to the second switch SW2. Therefore, for example, even in the case where an open circuit failure in which the second switch SW2 is always off occurs, the tertiary resonance circuit 948 can be set to the non-resonance state using the third switch SW3.

[0104] In addition, in the present embodiment, the power transmitting control device 60 is able to communicate with the power receiving side control section 96 of the power receiving device 80 Figure 5 ).

[0105] F2. Outline of the abnormality detection processing: In this embodiment, during anomaly detection processing, in addition to the various detection values ​​used when the power supply unit 340 is set to standby and power supply states, the detection values ​​used when it is set to check state are also used. Check state is a state not set in the power supply sequence. By using the detection values ​​in check state, as detailed later, faults in the third switch SW3 can be detected.

[0106] like Figure 10 As shown, when the power supply unit 340 is set to standby mode, the first switch SW1, the second switch SW2, and the third switch SW3 are all set to the off state. When the power supply unit 340 is set to power supply mode, the first switch SW1 and the third switch SW3 are set to the on state, and the second switch SW2 is set to the off state. When the power supply unit 340 is set to check mode, the first switch SW1 is set to the off state, and the second switch SW2 and the third switch SW3 are set to the on state. Therefore, both the power supply resonant circuit 42 and the coupling circuit 348 are set to a non-resonant state.

[0107] like Figure 11 As shown, similar to the second embodiment, in standby mode, both the current flowing through the power supply coil L1 and the current flowing through the tri-coil L3 are small. Furthermore, in power supply mode, the current flowing through the tri-coil L3 is larger than the current flowing through the power supply coil L1. Additionally, in check mode, the power supply resonant circuit 42 is set to a non-resonant state, therefore, as in standby mode, the current flowing through the power supply coil L1 is small. The difference between standby mode and check mode lies in the settings of the second switch SW2 and the third switch SW3. In standby mode, both the second switch SW2 and the third switch SW3 are set to the off state. Conversely, in check mode, both the second switch SW2 and the third switch SW3 are set to the on state. In check mode, the tri-coil L3 is short-circuited, therefore, the current flowing through the tri-coil L3 is reduced compared to the standby state.

[0108] like Figure 10 As shown, if the second switch SW2 is open-circuited, then when it is set to the check state, since the third switch SW3 is set to the closed state, a parallel resonant circuit is formed by the three-stage coil L3, the three-stage capacitor C3, and the additional capacitor C4. Therefore, as Figure 12 As shown, in the inspection state, the power supply coil L1, which carries the standby current, is magnetically coupled to the three-stage coil L3, and the parallel resonant circuit becomes resonant. Therefore, the current flowing through the three-stage coil L3 increases compared to normal. This allows for the detection of an open-circuit fault in the second switch SW2. The correspondence between the fault and the change in the detected value is as follows: Figures 12-14 As shown.

[0109] F3. Details of anomaly inspection and handling: like Figure 15As shown, the unit control section 46 transmits a checkable signal to the power transmission control device 60 in step S50. The power transmission control device 60 transmits a check permission signal to the power transmission units 40 after receiving the checkable signal, so that at least two adjacent power transmission units 40 among the arranged power transmission units 40 do not perform the abnormality detection process in the same period. Specifically, the power transmission control device 60 sets one of the plurality of power transmission units 340 as an object power transmission unit that performs the abnormality determination process. In the present embodiment, the power transmission control device 60 sequentially sets as the object power transmission unit in the arrangement order of the arranged power transmission units 40.

[0110] In addition, the power transmission control device 60 transmits a second prohibition signal that prohibits approaching the power transmission resonant circuit 42 whose state is switched by the switching circuit 44 controlled by the unit control section 46, which is the transmission destination of the check permission signal, to the power reception device 80 after transmitting the check permission signal. The power reception side control section 96 does not move into a predetermined position range centered on the power transmission resonant circuit 42 until receiving a permission signal until receiving the check permission signal, when receiving the second prohibition signal. Specifically, for example, the power transmission control device 60 includes position information of the power transmission unit 340 including the power transmission resonant circuit 42 that is the transmission destination of the check permission signal in the second prohibition signal. The power reception side control section 96 stops moving or moves around the position range. Thereby, it is possible to suppress the current flowing through the power transmission coil L1 of the check object from fluctuating due to the magnetic flux generated by the adjacent power transmission coil L1. In addition, it is possible to suppress the current flowing through the power transmission coil L1 of the check object from fluctuating due to the approach of the power reception coil L2 of the power reception device 80. Therefore, it is possible to improve the check accuracy.

[0111] The unit control section 46 determines whether the check permission signal is received from the power transmission control device 60 in step S52. When determining that the check permission signal is received in step S52, the process proceeds to step S10. On the other hand, when determining that the check permission signal is not received in step S52, the unit control section 46 repeatedly performs step S50 and step S52 until determining that the check permission signal is received.

[0112] When the unit control unit 46 determines in step S52 that an inspection permission signal has been received, it executes steps S10 to S18. In step S54, the unit control unit 46 sets the power supply unit 340 to an inspection state. In step S56, the unit control unit 46 acquires the detection value in the inspection state and stores the acquired detection value in its built-in memory. In step S20, the unit control unit 46 determines whether the detection value in the standby state is outside the first reference range. In step S20, if the unit control unit 46 determines that the detection value in the standby state is not outside the first reference range, it... Figure 16 In step S21, it is determined whether the detected value under power supply condition is outside the second reference range. If the unit control unit 46 determines in step S21 that the detected value under power supply condition is outside the second reference range, the process proceeds to step S38.

[0113] 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 in step S58 it determines that the detection value in the inspection state is outside the third reference range, the unit control unit 46 causes the process to proceed to step S62. If in step S58 it determines that the detection value in the inspection state is not outside the third reference range, the unit control unit 46 determines in step S22 that it is normal. In step S66, the unit control unit 46 sends an inspection end signal to the power supply control device 60, ending this processing routine. Upon receiving the inspection end signal, the power supply control device 60 changes the target power supply unit.

[0114] exist Figure 15 In step S20, if the unit control unit 46 determines that the detected value in the standby state is outside the first reference range, it determines it as abnormal in step S24. In step S32, the unit control unit 46 sends a first abnormality notification signal to the power supply control device.

[0115] exist Figure 16 In step S34, the unit control unit 46 determines whether the detected value under power supply conditions is outside the second reference range. If, in step S34, the detected value under power supply conditions is determined to be outside the second reference range, the unit control unit 46 proceeds to step S60. If, in step S34, the detected value under power supply conditions is determined to be outside the second reference range, the unit control unit 46 determines this as an anomaly in step S38. In step S40, the unit control unit 46 sends a second anomaly notification signal to the power supply control device 60.

[0116] In step S60, the unit control section 46 determines whether the detection value in the inspection state is outside the third reference range. When it is determined in step S60 that the detection value in the inspection state is not outside the third reference range, the unit control section 46 causes the process to proceed to step S66. When it is determined in step S60 that the detection value in the inspection state is outside the third reference range, the unit control section 46 determines an abnormality in step S62. In step S64, the unit control section 46 transmits a third abnormality notification signal indicating that the detection value in the inspection state is outside the third reference range to the power feeding control device 60. The unit control section 46 causes the process to proceed to step S66 after executing step S64.

[0117] The power feeding control device 60 transmits a first prohibition signal for prohibiting the power feeding resonant circuit 42 from being set to the resonant state to the power feeding unit 340 adjacent to the power feeding unit 340 from which the signal is transmitted, when it receives at least any one of the first abnormality notification signal, the second abnormality notification signal, and the third abnormality signal. The unit control section 46 maintains the state of the power feeding resonant circuit 42 as the non-resonant state after receiving the first prohibition signal until the permission signal is received. Thus, for example, it is possible to suppress occurrence of secondary failures in the power feeding unit 340 due to magnetic passage multiplicity.

[0118] According to the third embodiment described above, the same effects as those of the above-described embodiments are exerted. In addition, the power feeding control device 60 transmits a first prohibition signal to the power feeding unit 340 adjacent to the power feeding unit 340 from which the signal is transmitted, when it receives at least any one of the first abnormality notification signal, the second abnormality notification signal, and the third abnormality notification signal. Thus, it is possible to suppress occurrence of secondary failures.

[0119] In addition, the power feeding control device 60 sets one of the power feeding units 340 as an object power feeding unit, and transmits an inspection permission signal to the object power feeding unit. The power feeding unit 340 performs an abnormality determination process when it receives the inspection permission signal. Thus, the two adjacent power feeding units 340 do not perform the abnormality determination process at the same period, and thus it is possible to prevent magnetic flux interference, and improve the determination accuracy of the detection value.

[0120] In addition, the unit control section 46 transmits a second prohibition signal for prohibiting approach to the power feeding unit 340 to the power receiving device 80, the power feeding unit 340 including the unit control section 46 as a transmission destination of the inspection permission signal. Thus, it is possible to avoid magnetic coupling between the power feeding coil Ll performing the abnormality determination process and the power receiving coil L2, and thus improve the detection accuracy. It is possible to suppress false detection in which a failure is determined to be normal, and false detection in which no failure is determined to be abnormal, and the like.

[0121] G. Fourth Embodiment: Figure 17The power transmission unit 440 of the present embodiment shown has a different circuit structure from those of the above-described embodiments. The same symbols are affixed to the same structures as those of the above-described embodiments, and detailed description is appropriately omitted.

[0122] G1. Circuit structure of non-contact power feeding device: The power transmission unit 440 has a power transmission coil Ll, a power transmission capacitor Cl, a first switch SWl, and a second switch SW2. The power transmission capacitor Cl is connected in parallel to the power transmission coil Ll. The first switch SWl is connected in series to the power transmission coil Ll. The second switch SW2 is connected between the first switch SWl and the power transmission coil Ll. The power transmission resonance circuit 442 is a parallel resonance circuit.

[0123] When set to the standby state, the unit control section 46 sets the first switch SWl to the off state and sets the second switch SW2 to the on state. When set to the power feeding state, the first switch SWl is set to the on state and the second switch SW2 is set to the off state.

[0124] The second current sensor 54 is connected between the AC power supply 11 and the first switch SWl and detects the input current to the power transmission resonance circuit 442. The voltage sensor 53 detects the voltage of the power transmission capacitor Cl. The first current sensor 51 and the magnetic sensor 52 are the same as those of the first embodiment described above.

[0125] Changes in each detected value at the time of a failure are as shown in Figure 18 and Figure 19 "I (IN)" in Figure 18 and 19 is the detected value of the second current sensor 54.

[0126] In the power transmission resonance circuit 442 of the present embodiment, when the first switch SWl has a short-circuit failure in the standby state, the detected value of the first current sensor 51 increases from that in the normal state. Therefore, as in the first embodiment, abnormality detection processing can be performed using the detected value in the standby state.

[0127] H. Fifth Embodiment: Figure 20 The power transmission unit 540 of the present embodiment shown has a different circuit structure from those of the above-described embodiments. The same symbols are affixed to the same structures as those of the above-described embodiments, and detailed description is appropriately omitted.

[0128] H1. Circuit structure of non-contact power feeding device: The power transmission unit 540 has a power transmission coil Ll, a first power transmission capacitor Cll, a second power transmission capacitor C12, a first switch SWl, a second switch SW2, and a third switch SW3. The first power transmission capacitor Cll is connected in parallel to the power transmission coil Ll. The second power transmission capacitor C12 is connected in series to the third switch SW3. The third switch SW3 is a unidirectional switch having one FET. The connection body of the second power transmission capacitor C12 and the third switch SW3 is connected in parallel to the power transmission coil Ll. The second switch SW2 is connected in series to the power transmission coil Ll. The first switch SWl is connected in series to the power transmission coil Ll. The second switch SW2, the connection body of the second power transmission capacitor C12 and the third switch SW3, and the first power transmission capacitor Cll are connected between the first switch SWl and the power transmission coil Ll.

[0129] The capacitance value of the power transmission resonance circuit 542 as a parallel resonance circuit is switched by switching the on / off state of the third switch SW3.

[0130] When set to the standby state, the unit control section 46 sets the first switch SWl to the off state, sets the second switch SW2 to the on state, and sets the third switch SW3 to the off state. When set to the power feeding state, the first switch SWl is set to the on state, the second switch SW2 is set to the off state, and the third switch SW3 is set to the on state. When set to the check state, the first switch SWl is set to the off state, the second switch SW2 is set to the off state, and the third switch SW3 is set to the off state. When set to the second check state, the first switch SWl is set to the off state, the second switch SW2 is set to the on state, and the third switch SW3 is set to the on state.

[0131] In the power transmission resonance circuit 542 of the present embodiment, when a short-circuit failure occurs in the first switch SWl or the third switch SW3 in the standby state, the detection value of the first current sensor 51 increases compared to the normal time. Therefore, as in the first embodiment, the detection value in the standby state can be used for the abnormality detection processing.

[0132] I. Other Embodiments (I1) In the above-described first embodiment, the unit control section 46 performs the abnormality detection processing when the power transmission unit 40 is started. The timing of performing the abnormality detection processing is not limited to when the power transmission unit 40 is started, and for example, the timing when the manager instructs the unit control section 46 to perform the abnormality detection processing can be used.

[0133] (I2) The order of the step S14, the step S16, and the step S18 in the abnormality detection process of the second embodiment described above is not limited to the above, as long as the detection values in each state can be acquired. Also, the steps S20, S21, S34 of determining whether or not there is an abnormality are also similarly not limited to the above order. The same applies to the abnormality detection process of the third embodiment.

[0134] (I3) In the first embodiment described above, the proximity of the power receiving coil L2 is detected using the magnetic sensor 52. The detection method of the power receiving coil L2 is not limited to this, and detection can be performed by a camera or the like, for example.

[0135] (I4) In the first embodiment described above, it is a so-called S-S method circuit structure in which the power transmission capacitor Cl is connected in series with the power transmission coil LI in the power transmission resonant circuit 42, and the power receiving capacitor C2 is connected in series with the power receiving coil L2 in the power receiving resonant circuit 81. The circuit structure of the power transmission resonant circuit 42 and the circuit structure of the power receiving resonant circuit 81 are not limited to the S-S method. (a) For example, it can be a so-called P-S method circuit structure in which the power transmission capacitor Cl is connected in parallel with the power transmission coil LI in the power transmission resonant circuit 42, and the power receiving capacitor C2 is connected in series with the power receiving coil L2 in the power receiving resonant circuit 81. (b) In addition, it can be a so-called P-SS method circuit structure in which, in addition to the power transmission capacitor Cl connected in series with the power transmission coil LI, a capacitor connected in parallel with the power transmission coil LI is included, and two power receiving capacitors C2 are connected in series with two terminals of the power receiving coil L2 in the power receiving resonant circuit 81. (c) In addition, it can be a so-called SP-PS method circuit structure in which, in addition to the power transmission capacitor Cl connected in series with the power transmission coil LI, a capacitor connected in parallel with the power transmission coil LI is included, and a first power receiving capacitor connected in series with the power receiving coil L2 and a second power receiving capacitor connected in parallel with the power receiving coil L2 are included in the power receiving resonant circuit 81. (d) In addition, the power transmission resonant circuit 42 can have a closed circuit in which a coil and a capacitor are connected in series. The coil of the closed circuit is disposed at a position that is capable of being magnetically coupled with the power receiving coil L2 when the power transmission coil LI and the power receiving coil L2 are magnetically coupled. (e) Furthermore, the capacitor of the closed circuit can be connected in parallel with the coil, instead of being connected in series. (f) In addition, the power transmission resonant circuit 42 can include a coil connected in series with the power transmission coil LI, and include a capacitor connected in parallel with the coil. The coil is disposed at a position that is capable of being magnetically coupled with the power receiving coil L2 when the power transmission coil LI and the power receiving coil L2 are magnetically coupled.

[0136] (I5) In the above-described first embodiment, the switching element constituting the first switch SW1 is realized by a FET. As another embodiment, the switching element can also be realized by another semiconductor element, such as an IGBT (Insulated Gate Bipolar Transistor) connected with a freewheeling diode. The same applies to the second switch SW2 and the third switch SW3 in the embodiment other than the first embodiment. In addition, the first switch SW1 is not limited to a bidirectional switch, but can also be a unidirectional switch constituted by one switching element. The third switch SW3 can also be a bidirectional switch.

[0137] (I6) In the above-described second embodiment, the current value of the current flowing through the tertiary coil L3 is directly detected by the second current sensor 54. 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 can also be indirectly detected by detecting the voltage value of the tertiary coil L3 and the magnetic flux density in the vicinity of the tertiary coil L3. Likewise, the method of directly detecting the voltage value of the second power transmission capacitor C12 is not limited to the method using the voltage sensor 53. The voltage value of the second power transmission capacitor C12 can also be indirectly detected by detecting the current value flowing through the second power transmission capacitor C12. In addition, in the above-described second embodiment, the power transmission unit 240 includes the first current sensor 51, the magnetic sensor 52, the voltage sensor 53, and the second current sensor 54. The power transmission unit 240 is not limited to the structure including the four sensors of the first current sensor 51, the magnetic sensor 52, the voltage sensor 53, and the second current sensor 54. It is preferable to install the sensors in accordance with the predicted failure. For example, the power transmission unit 240 includes at least the first current sensor 51, thereby detecting the short-circuit failure of the first switch SW1.

[0138] (I7) The coupling circuit 348 of the above-described third embodiment includes the tertiary capacitor C3 and the additional capacitor C4 connected in parallel with the tertiary coil L3. As another embodiment of the coupling circuit 348, the tertiary capacitor C3 can not be included. In the case where the tertiary capacitor C3 is not included, the state of the coupling circuit 348 can be switched between the non-resonance state and the resonance state by switching the state of the third switch SW3 connected in series with the additional capacitor C4 between the off state and the on state.

[0139] (I8) In the above-described third embodiment, the power transmission control device 60 is capable of communicating with the power reception side control section 96 of the power reception device 80. In the above-described abnormality detection processing, the power transmission control device 60 and the power reception side control section 96 can not communicate, for example, in the case where the communication with the power transmission control device 60 is not performed in step S50 and the like. Figure 15 In the abnormality detection processing shown in FIG. 8, the power transmission control device 60 and the power reception side control section 96 can not communicate, for example, in the case where the communication with the power transmission control device 60 is not performed in step S50 and the like.

[0140] The unit control section and the method thereof according to the present disclosure can also be realized by a special-purpose computer provided by a processor programmed to execute one or more functions embodied by a computer program and a memory. Alternatively, the control section and the method thereof according to the present disclosure can be realized by a special-purpose computer provided by a processor constituted by one or more special-purpose hardware logic circuits. Alternatively, the control section and the method thereof according to the present disclosure can be realized by one or more special-purpose computers constituted by a processor programmed to execute one or more functions and a memory in combination with a processor constituted by one or more hardware logic circuits. Further, the computer program can be stored in a computer-readable non-transitory tangible recording medium as instructions to be executed by a computer.

[0141] The present disclosure is not limited to the above-described embodiments and modifications, and can be realized in various structures without departing from the gist thereof. For example, the technical features in each of the embodiments and modifications corresponding to the technical features in each of the modes described in the summary of the application can be appropriately replaced or combined to solve part or all of the above-described technical problems or achieve part or all of the above-described effects. In addition, if a certain technical feature is not described as essential in the present specification, it can be appropriately deleted.

[0142] J: Other modes: The features of the present disclosure are as follows.

[0143] (Mode 1) A non-contact power feeding device (10, 210) that non-contact power feeds a power receiving device (80) having a secondary coil (L2) includes: A power feeding resonant circuit (42, 442, 542) having a primary coil (L1) and a primary capacitor (C1) that can be magnetically coupled with the secondary coil; An alternating-current power source (11) that supplies alternating-current power of a predetermined operating frequency to the power feeding resonant circuit; A switching circuit (44) for switching a state of the power feeding resonant circuit between a resonant state and a non-resonant state; A detection section (51) for directly or indirectly detecting a current value of a current flowing through the primary coil; and A unit control section (46) that controls the switching circuit, The unit control section performs at least either of a first abnormality determination process and a second abnormality determination process, the first abnormality determination process determines whether the non-contact power supply device is abnormal using a first detection value detected by the detection section in the non-resonance state, the second abnormality determination process determines whether the non-contact power supply device is abnormal using a second detection value detected by the detection section in the resonance state, In the first abnormality determination process, a first determination step and a first abnormality determination step are performed, the first determination step determines whether the first detection value is outside a first reference range determined in advance, the first abnormality determination step determines abnormality when the first determination step determines that the first detection value is outside the first reference range, In the second abnormality determination process, a second determination step and a second abnormality determination step are performed, the second determination step determines whether the second detection value is outside a second reference range determined in advance, the second abnormality determination step determines abnormality when the second determination step determines that the second detection value is outside the second reference range.

[0144] (Manner 2) In the non-contact power supply device described in Manner 1, wherein The unit control section, in the second abnormality determination process, When the second determination step determines that the second detection value is outside the second reference range, a third determination step is further performed, the third determination step determines whether the second detection value is outside a circuit reference range that is larger than the second reference range, when the third determination step determines that the second detection value is outside the circuit reference range, a circuit abnormality that is an abnormality of a circuit possessed by the non-contact power supply device is determined, when the third determination step determines that the second detection value is not outside the circuit reference range, a foreign matter abnormality that is a foreign matter attached to the non-contact power supply device is determined.

[0145] (Manner 3) In the non-contact power supply device described in Manner 1, wherein Further includes a power transmission control device (60) that communicates with the unit control section, The unit control section, when the first abnormality determination process determines abnormality, transmits a first abnormality notification signal to the power transmission control device, when the second abnormality determination process determines abnormality, transmits a second abnormality notification signal to the power transmission control device.

[0146] (Manner 4) In the non-contact power supply device described in Manner 3, wherein Includes a plurality of power transmission units (40) that include the power transmission resonance circuit, the switching circuit, the detection section, and the unit control section, a plurality of the power transmission units are arranged, The power transmission control device transmits a first prohibition signal that prohibits the power transmission resonant circuit from being set to the resonant state to a power transmission unit adjacent to the power transmission unit that transmitted at least one of the first abnormality notification signal and the second abnormality notification signal, when receiving at least one of the first abnormality notification signal and the second abnormality notification signal.

[0147] (Mode 5) In the non-contact power feeding device described in Mode 3, includes a plurality of power transmission units (40) that include the power transmission resonant circuit, the switching circuit, the detection section, and the unit control section, The power transmission control device sets one of the plurality of power transmission units as an object power transmission unit that performs at least one of the first abnormality judgment processing and the second abnormality judgment processing, transmits a check permission signal to the object power transmission unit, The object power transmission unit performs at least one of the first abnormality judgment processing and the second abnormality judgment processing when receiving the check permission signal.

[0148] (Mode 6) In the non-contact power feeding device described in any one of Modes 1 to 5, The unit control section performs at least one of the first abnormality judgment processing and the second abnormality judgment processing when the non-contact power feeding device is started.

[0149] (Mode 7) In the non-contact power feeding device described in any one of Modes 1 to 6, performs a power receiving device judgment step that judges whether the power receiving device is located within a position range in which non-contact power feeding is possible, before performing at least one of the first abnormality judgment processing and the second abnormality judgment processing, performs at least one of the first abnormality judgment processing and the second abnormality judgment processing after judging that the power receiving device is not located within the position range in the power receiving device judgment step.

[0150] (Mode 8) In the non-contact power feeding device described in any one of Modes 1 to 7, further includes a power transmission control device that communicates with the unit control section, The power transmission control device transmits a check permission signal to the unit control section, The unit control section performs at least one of the first abnormality determination processing and the second abnormality determination processing when the inspection permission signal is received, The power transmission control device transmits a second prohibition signal that prohibits access to the power transmission resonant circuit in which the switching state of the switching circuit is switched, to the power reception device, and the switching circuit is controlled by the unit control section that is a transmission destination of the inspection permission signal.

[0151] (way 9) The non-contact power transmission device according to any one of ways 1 to 8, wherein The primary capacitor includes a first power transmission capacitor and a second power transmission capacitor, The power transmission resonant circuit further has a first switch connected in series to the second power transmission capacitor, The first power transmission capacitor is connected in series to the primary coil, The connection body of the second power transmission capacitor and the first switch is connected in parallel to the first power transmission capacitor, The detection section is a first current sensor that directly detects a current value of a current flowing through the primary coil, The non-contact power transmission device further includes: A coupling circuit having a tertiary coil, a tertiary capacitor, and a second switch, the tertiary coil being capable of being magnetically coupled to the primary coil, the tertiary capacitor being connected in parallel to the tertiary coil, and the second switch being connected in parallel to 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; and A magnetic sensor that detects a magnitude of a magnetic flux in the vicinity of 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 sets the power transmission resonant circuit to the non-resonant state by setting the first switch to an off state, The unit control section performs a fourth determination step, a fifth determination step, and a sixth determination step after the first abnormality determination step, the fourth determination step determining whether a detection value of the voltage sensor is outside a first reference voltage range determined in advance, the fifth determination step determining whether a detection value of the second current sensor is outside a first reference current range determined in advance, and the sixth determination step determining whether a detection value of the magnetic sensor is outside a first reference magnetic flux range determined in advance, When it is determined in the fourth determination step that the detection value of the voltage sensor is outside the first reference voltage range, and it is determined in the fifth determination step that the detection value of the second current sensor is outside the first reference current range, and it is determined in the sixth determination step that the detection value of the magnetic sensor is outside the first reference magnetic flux range, it is determined that a short-circuit failure has occurred in the first switch.

[0152] (Mode 10) In the non-contact power feeding device described in Mode 9, The unit control section, after the second abnormality determination step, performs a seventh determination step, an eighth determination step, and a ninth determination step, the seventh determination step determines whether the detection value of the voltage sensor is outside a second reference voltage range determined in advance, the eighth determination step determines whether the detection value of the second current sensor is outside a second reference current range determined in advance, and the ninth determination step determines whether the detection value of the magnetic sensor is outside a second reference magnetic flux range determined in advance, When it is determined in the seventh determination step that the detection value of the voltage sensor is outside the second reference voltage range, and it is determined in the eighth determination step that the detection value of the second current sensor is outside the second reference current range, and it is determined in the ninth determination step that the detection value of the magnetic sensor is outside the second reference magnetic flux range, it is determined that a failure has occurred in the power feeding resonance circuit.

[0153] (Mode 11) In the non-contact power feeding device described in any one of Modes 1 to 8, The primary capacitor includes a first power feeding capacitor and a second power feeding capacitor, The power feeding resonance circuit further has a first switch connected in series to the second power feeding capacitor, The first power feeding capacitor is connected in series to the primary coil, The connection body of the second power feeding capacitor and the first switch is connected in parallel to the first power feeding capacitor, The non-contact power feeding device further includes a coupling circuit having a tertiary coil capable of being magnetically coupled to the primary coil, a tertiary capacitor connected in parallel to the tertiary coil, a second switch connected in parallel to the tertiary coil, an additional capacitor, and a third switch connected in series to the additional capacitor, The connection body of the additional capacitor and the third switch is connected in parallel to the tertiary coil, The detection section 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.

[0154] (Manner 12) The non-contact power feeding device according to any one of Manners 1 to 11, wherein The power transmission resonant circuit further has (i) a first switch connected in series with the primary coil, (ii) a second switch connected in parallel with the primary coil between the primary coil and the first switch, The primary capacitor is connected in parallel with the primary coil between the first switch and the primary coil, The detection section 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.

Claims

1. A non-contact power feeding apparatus (10, 210) that performs non-contact power feeding on a power receiving apparatus (80) having a secondary coil (L2), comprising: a power feeding resonant circuit (42, 442, 542) having a primary coil (LI) that can be magnetically coupled with the secondary coil and a primary capacitor (CI); an alternating-current power source (11) that supplies the power feeding resonant circuit with alternating-current power of a predetermined operating frequency; a switching circuit (44) for switching a state of the power feeding resonant circuit between a resonant state and a non-resonant state; a detection section (51) for directly or indirectly detecting a current value of a current flowing through the primary coil; and a unit control section (46) that controls the switching circuit, the unit control section performing at least either of a first abnormality judgment process that judges whether or not the non-contact power feeding apparatus is abnormal using a first detection value detected by the detection section in the non-resonant state and a second abnormality judgment process that judges whether or not the non-contact power feeding apparatus is abnormal using a second detection value detected by the detection section in the resonant state, in the first abnormality judgment process, a first judgment step that judges whether or not the first detection value is outside a predetermined first reference range and a first abnormality judgment step that judges as abnormal when judged in the first judgment step that the first detection value is outside the first reference range are performed, in the second abnormality judgment process, a second judgment step that judges whether or not the second detection value is outside a predetermined second reference range and a second abnormality judgment step that judges as abnormal when judged in the second judgment step that the second detection value is outside the second reference range are performed.

2. The non-contact power feeding apparatus according to claim 1, wherein the unit control section further performs, in the second abnormality judgment process, a third judgment step that judges whether or not the second detection value is outside a circuit reference range that is larger in range than the second reference range when judged in the second judgment step that the second detection value is outside the second reference range, judges as a circuit abnormality that is an abnormality of a circuit possessed by the non-contact power feeding apparatus when judged in the third judgment step that the second detection value is outside the circuit reference range, and judges as a foreign matter abnormality that is an abnormality of a foreign matter attached to the non-contact power feeding apparatus when judged in the third judgment step that the second detection value is not outside the circuit reference range.

3. The non-contact power feeding apparatus according to claim 1, further comprising a power feeding control device (60) that communicates with the unit control section, the unit control section transmits a first abnormality notification signal to the power feeding control device when judged as abnormal in the first abnormality judgment process and transmits a second abnormality notification signal to the power feeding control device when judged as abnormal in the second abnormality judgment process.

4. The non-contact power feeding apparatus according to claim 3, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The power transmission device includes a plurality of power transmission units (40) including the power transmission resonant circuit, the switching circuit, the detection unit, and the unit control unit, The plurality of power transmission units are arranged, The power transmission control device transmits a first prohibition signal that prohibits the power transmission resonant circuit from being set to the resonant state to a power transmission unit adjacent to the power transmission unit that transmitted at least one of the first abnormality notification signal and the second abnormality notification signal when at least one of the first abnormality notification signal and the second abnormality notification signal is received.

5. The non-contact power feeding device according to claim 3, wherein The power transmission device includes a plurality of power transmission units (40) including the power transmission resonant circuit, the switching circuit, the detection unit, and the unit control unit, The power transmission control device sets one of the plurality of power transmission units as an object 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 object power transmission unit, The object power transmission unit performs at least one of the first abnormality determination process and the second abnormality determination process when the inspection permission signal is received.

6. 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 started.

7. The non-contact power feeding device according to claim 1, wherein A power receiving device determination step that determines whether the power receiving device is located within a position range in which non-contact power feeding is possible is performed before at least one of the first abnormality determination process and the second abnormality determination process is performed, At least one of the first abnormality determination process and the second abnormality determination process is performed after it is determined in the power receiving device determination step that the power receiving device is not located within the position range.

8. The non-contact power feeding device according to claim 1, 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, The unit control unit performs at least one of the first abnormality determination process and the second abnormality determination process when the inspection permission signal is received, The power transmission control device transmits a second prohibition signal that prohibits the power transmission resonant circuit from switching the state of the switching circuit to the power receiving device, the switching circuit being controlled by the unit control unit that is the transmission destination of the inspection permission signal.

9. The non-contact power feeding device according to claim 1, wherein The primary capacitor includes a first power transmission capacitor and a second power transmission capacitor, The power transmission resonant circuit further has a first switch connected in series to the second power transmission capacitor, The first power transmission capacitor is connected in series to the primary coil, A connection body of the second power transmission capacitor and the first switch is connected in parallel to the first power transmission 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 includes: a coupling circuit having a tertiary coil, a tertiary capacitor, and a second switch, the tertiary coil being capable of being magnetically coupled with the primary coil, the tertiary capacitor being connected in parallel with the tertiary coil, and the second switch being 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; and a magnetic sensor that detects a magnitude of a magnetic flux in the vicinity of the primary coil, The switching circuit sets the power transmission resonance circuit to the resonance state by setting the first switch to an on state, and sets the power transmission resonance circuit to the non-resonance state by setting the first switch to an off state, The unit control unit, after the first abnormality determination step, performs a fourth determination step, a fifth determination step, and a sixth determination step, the fourth determination step determining whether the detected value of the voltage sensor is outside a first reference voltage range determined in advance, the fifth determination step determining whether the detected value of the second current sensor is outside a first reference current range determined in advance, and the sixth determination step determining whether the detected value of the magnetic sensor is outside a first reference magnetic flux range determined in advance, When it is determined in the fourth determination step that the detected value of the voltage sensor is outside the first reference voltage range, and it is determined in the fifth determination step that the detected value of the second current sensor is outside the first reference current range, and it is determined in the sixth determination step that the detected value of the magnetic sensor is outside the first reference magnetic flux range, it is determined that a short-circuit failure has occurred in the first switch.

10. The non-contact power supply device according to claim 9, wherein The unit control unit, after the second abnormality determination step, performs a seventh determination step, an eighth determination step, and a ninth determination step, the seventh determination step determining whether the detected value of the voltage sensor is outside a second reference voltage range determined in advance, the eighth determination step determining whether the detected value of the second current sensor is outside a second reference current range determined in advance, and the ninth determination step determining whether the detected value of the magnetic sensor is outside a second reference magnetic flux range determined in advance, When it is determined in the seventh determination step that the detected value of the voltage sensor is outside the second reference voltage range, and it is determined in the eighth determination step that the detected value of the second current sensor is outside the second reference current range, and it is determined in the ninth determination step that the detected value of the magnetic sensor is outside the second reference magnetic flux range, it is determined that a failure has occurred in the power transmission resonance circuit.

11. The non-contact power supply device according to claim 1, wherein 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 with the primary coil, The connection body of the second power transmission capacitor and the first switch is connected in parallel to the first power transmission capacitor, The non-contact power feeding device further includes a coupling circuit having: a tertiary coil capable of being magnetically coupled to the primary coil; a tertiary capacitor connected in parallel to the tertiary coil; a second switch connected in parallel to the tertiary coil; an additional capacitor; and a third switch connected in series to the additional capacitor, The connection body of the additional capacitor and the third switch is connected in parallel to the tertiary coil, The detection section 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 resonance circuit to the resonance state by setting the first switch and the third switch to an on state, and setting the second switch to an 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 an off state.

12. The non-contact power feeding device according to claim 1, wherein The power transmission resonance circuit further has: (i) a first switch connected in series to the primary coil; (ii) a second switch connected in parallel to the primary coil between the primary coil and the first switch, The primary capacitor is connected in parallel to the primary coil between the first switch and the primary coil, The detection section 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 resonance circuit to the resonance state by setting the first switch to an on state, and setting the second switch to an off state, and sets the power transmission resonance circuit to the non-resonance state by setting the first switch to an off state, and setting the second switch to an on state.

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