Non-contact charging device

Abstract

To provide a non-contact charging device capable of being miniaturized.SOLUTION: A non-contact charging device 1 capable of charging a battery 4 mounted on a vehicle in a non-contact manner includes: a secondary coil 11 provided to face a primary coil 91 of a power supply device 90; and a power conversion unit 12 that converts AC power transmitted from the primary coil 91 to the secondary coil 11 into DC power capable of charging the battery 4. At least part of the power conversion unit 12 is used as part of a drive circuit that drives an auxiliary device 20 provided in the vehicle when no power is supplied from the power supply device 90 to the secondary coil 11.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a non-contact charging device capable of charging a battery mounted on a vehicle without contact.

Background Art

[0002] In recent years, vehicles equipped with a motor as a driving power source have become widespread. These vehicles are equipped with a battery for driving the motor, and the battery is charged as needed. As a technology related to battery charging, for example, there is one described in Patent Document 1 whose citation is shown below.

[0003] Patent Document 1 describes a motor drive device. This motor drive device includes a battery, a motor, a power conversion unit, a third inverter, a third switch, and a control device. The control device is configured to be able to perform control in two modes: a drive mode for driving the motor when the vehicle is moving and an external AC charging mode for transmitting power from an external AC power source to the battery when the battery is charged. In the drive mode, the power conversion unit is driven to energize the motor, and in the external AC charging mode, the power conversion unit and the third inverter are driven to charge the battery. The driving of the power conversion unit when energizing the motor and the driving of the power conversion unit and the third inverter when charging the battery are switched by the third switch.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, the motor drive device described in Patent Document 1 uses the power conversion unit in the drive mode to drive the motor, and uses the power conversion unit and the third inverter in the external AC charging mode to transfer power from an external AC power source to the battery. Thus, in the motor drive device described in Patent Document 1, the third inverter is used only in the external AC charging mode. In other words, the motor drive device described in Patent Document 1 needs to be equipped with a third inverter that is not used when the vehicle is running.

[0006] Here, when charging a battery, not only is it charged by power supplied from an external AC power source via a harness as described in Patent Document 1, but some batteries are charged by power supplied contactlessly without using a harness. Even if the motor drive device described in Patent Document 1 is applied to such a contactless charging device that charges a battery contactlessly, it is necessary to install a third inverter that is not used when the vehicle is running, as described above, which increases the size.

[0007] Therefore, there is a demand for a non-contact charging device that can be made smaller. [Means for solving the problem]

[0008] The characteristic configuration of the contactless charging device of the present invention is that it is a contactless charging device capable of contactlessly charging a battery mounted on a vehicle, and comprises a secondary coil arranged opposite the primary coil of a power supply device, and a power conversion unit that converts AC power transmitted from the primary coil to the secondary coil into DC power that can charge the battery, and when power is not supplied to the secondary coil from the power supply device, at least a portion of the power conversion unit is used as part of a drive circuit that drives accessories installed in the vehicle.

[0009] The power conversion unit that converts AC power transmitted from the power supply device into DC power capable of charging the battery is used when the vehicle is parked or stopped for contactless charging, while the drive circuit that drives the vehicle's accessories is used when the vehicle is running. Therefore, by configuring the vehicle as described above, it is possible to use both the power conversion unit that does not convert AC power capable of charging the battery while the vehicle is running and the drive circuit that does not drive the vehicle's accessories while the vehicle is parked or stopped. This allows for a smaller size than when the power conversion unit and the drive circuit are provided separately. [Brief explanation of the drawings]

[0010]

Figure 1

Figure 2

Figure 3

[0011] The contactless charging device according to the present invention is configured to contactlessly charge a battery mounted on a vehicle while the vehicle is parked or stopped, and to be usable for purposes other than battery charging while the vehicle is running. The contactless charging device 1 of this embodiment will be described below. However, the contactless charging device 1 is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the invention.

[0012] Fig. 1 shows a vehicle 2 equipped with a wireless charging device 1. In Fig. 1, the front side of the vehicle 2 in the traveling direction is indicated by "F" and the rear side of the vehicle 2 in the traveling direction is indicated by "B".

[0013] At the bottom 2A of the vehicle 2, a battery 4 for storing the electric power used for the running of the vehicle 2 is provided. The battery 4 is housed in a housing 10 so as to face the road surface 200 in order to prevent damage caused by small stones or the like that bounce up during the running of the vehicle 2. The housing 10 has a bottomed box shape using, for example, resin, and a housing space 10A is formed. The battery 4 is housed in this housing space 10A. The housing 10 is provided between a pair of front wheels FW and a pair of rear wheels RW at the bottom 2A facing the road surface 200 while the vehicle 2 is running.

[0014] The vehicle 2 is provided with a traveling motor M capable of running the vehicle 2. Electric power is supplied to this traveling motor M from the battery 4 described above. In the present embodiment, the rotational force of the traveling motor M is transmitted to a pair of front wheels FW. However, it may be configured such that the rotational force of the traveling motor M is transmitted to a pair of rear wheels RW, or it may be configured such that the rotational force of the traveling motor M is transmitted to a pair of front wheels FW and a pair of rear wheels RW.

[0015] The battery 4 is configured to be chargeable non - contact by a non - contact charging device 1. Non - contact charging means charging wirelessly, rather than charging via a harness, cable, etc. from a power supply device 90. Of course, in addition to non - contact charging, the battery 4 may be further configured to be chargeable via a harness, cable, etc.

[0016] The non - contact charging device 1 includes a secondary coil 11 and a power conversion unit 12. When charging the battery 4, the vehicle 2 is parked so that the secondary coil 11 is provided to face the primary coil 91 of the power supply device 90. The primary coil 91 is buried in the ground with the power supply surface 91A exposed on the road surface 200. In the present embodiment, a cable 93 for electrically connecting the power unit 92 of the power supply device 90 and the primary coil 91 is also buried in the ground. The primary coil 91 is supplied with alternating current power from the power unit 92 via the cable 93.

[0017] The power conversion unit 12 converts the AC power transmitted from the primary coil 91 to the secondary coil 11 into DC power that can charge the battery 4. Power transmission from the primary coil 91 to the secondary coil 11 is performed, for example, by magnetic resonance coupling. Of course, power transmission may be performed by electromagnetic induction. In any case, AC power transmitted from the primary coil 91 is generated in the secondary coil 11. The power conversion unit 12 converts this AC power into DC power. Note that the power conversion unit 12 may be configured to be able to convert the voltage value (step up or step down) when the voltage value of the DC power constituting the converted DC power is not suitable for charging the battery 4.

[0018] FIG. 2 shows a circuit diagram of the non-contact charging device 1 and the power supply device 90 of the present embodiment. As described above, the power supply device 90 includes a primary coil 91 and a power unit 92. The power unit 92 of the present embodiment has a power supply unit 92A, a capacitor 92B, an orthogonal conversion unit 92C, and a control unit 92D as shown in FIG. 2.

[0019] The power supply unit 92A outputs DC power across the first power line 93A and the second power line 93B. It is preferable that the voltage value of the DC voltage constituting the DC power output from the power supply unit 92A is suitable for the voltage value capable of charging the battery 4. In this case, the power conversion unit 12 may not be configured to convert the voltage value as described above.

[0020] The capacitor 92B is provided across the first power line 93A and the second power line 93B. The capacitor 92B smoothes the ripple voltage of the voltage and the ripple current of the current constituting the DC power output from the power supply unit 92A.

[0021] The DC / DC converter 92C converts DC power supplied across the first power supply line 93A and the second power supply line 93B into AC power and supplies the converted AC power to the primary coil 91. The DC / DC converter 92C has two legs 94A and 94B arranged in parallel across the first power supply line 93A and the second power supply line 93B. Each of the legs 94A and 94B has a high-side switching element Q1 and a low-side switching element Q2 connected in series. In this embodiment, n-type IGBTs (Insulated Gate Bipolar Transistors) are used as the switching elements Q1 and Q2.

[0022] The collector terminal of the switching element Q1 in each of the legs 94A and 94B is electrically connected to the first power supply line 93A. The emitter terminal of the switching element Q2 in each of the legs 94A and 94B is electrically connected to the second power supply line 93B. The emitter terminal of the switching element Q1 in each of the legs 94A and 94B is electrically connected to the collector terminal of the switching element Q2. The emitter terminal of the switching element Q1 in the leg 94A is electrically connected to one terminal of the primary coil 91. The emitter terminal of the switching element Q1 in the leg 94B is electrically connected to the other terminal of the primary coil 91.

[0023] The control unit 92D is electrically connected to the gate terminals of the switching elements Q1 and Q2, and drives the orthogonal conversion unit 92C by alternately switching between a first control state in which the switching element Q1 of the leg 94A and the switching element Q2 of the leg 94B are closed and the switching element Q2 of the leg 94A and the switching element Q1 of the leg 94B are open, and a second control state in which the switching element Q2 of the leg 94A and the switching element Q1 of the leg 94B are closed and the switching element Q1 of the leg 94A and the switching element Q2 of the leg 94B are open.

[0024] A diode D1 is provided between the emitter terminal and collector terminal of each of the switching elements Q1 and Q2. The cathode terminal of the diode D1 is electrically connected to the collector terminal of each of the switching elements Q1 and Q2, and the anode terminal is electrically connected to the emitter terminal of each of the switching elements Q1 and Q2.

[0025] The power conversion unit 12 of the contactless charging device 1 in this embodiment has three legs 14A, 14B, and 14C arranged in parallel across a third power supply line 13A and a fourth power supply line 13B, which are respectively connected to a pair of terminals of the battery 4. Each of the three legs 14A, 14B, and 14C has at least two switching elements (in this embodiment, a high-side switching element Q3 and a low-side switching element Q4) connected in series. In this embodiment, n-type IGBTs are also used for the switching elements Q3 and Q4.

[0026] The collector terminal of the switching element Q3 of each of the legs 14A, 14B, and 14C is electrically connected to the third power supply line 13A. The emitter terminal of the switching element Q4 of each of the legs 14A, 14B, and 14C is electrically connected to the fourth power supply line 13B. The emitter terminal of the switching element Q3 of the leg 14A is electrically connected to the collector terminal of the switching element Q4 of the leg 14A. The emitter terminal of the switching element Q3 of the leg 14B is electrically connected to the collector terminal of the switching element Q4 of the leg 14B. The emitter terminal of the switching element Q3 of the leg 14C is electrically connected to the collector terminal of the switching element Q4 of the leg 14C.

[0027] The emitter terminal of the switching element Q3 in leg 14A is electrically connected to one terminal of the secondary coil 11. The emitter terminal of the switching element Q3 in leg 14B is electrically connected to the other terminal of the secondary coil 11. The emitter terminal of the switching element Q3 in leg 14C is not connected to the secondary coil 11.

[0028] The power conversion unit 12 drives the switching elements Q3 and Q4 respectively provided in two preset legs 14A and 14B among the three legs 14A, 14B, and 14C to convert AC power into DC power.

[0029] The control unit 15 is electrically connected to the gate terminals of the switching elements Q3 and Q4 respectively. When AC power is transmitted from the primary coil 91 to the secondary coil 11, the control unit 15 closes the switching element Q3 of leg 14A and the switching element Q4 of leg 14B, and opens the switching element Q4 of leg 14A and the switching element Q3 of leg 14B, and a third control state, and closes the switching element Q4 of leg 14A and the switching element Q3 of leg 14B, and opens the switching element Q3 of leg 14A and the switching element Q4 of leg 14B, and a fourth control state, and drives the power conversion unit 12 so as to alternately switch between them. As a result, the DC power converted by the power conversion unit 12 is supplied across the third power line 13A and the fourth power line 13B, and the battery 4 can be charged. Therefore, when AC power is being transmitted from the primary coil 91 to the secondary coil 11, the control unit 15 does not drive the switching elements Q3 and Q4 of leg 14C.

[0030] A diode D2 is provided across the emitter terminal and the collector terminal of each of the switching elements Q3 and Q4. The cathode terminal of the diode D2 is electrically connected to the collector terminals of the switching elements Q3 and Q4, and the anode terminal is electrically connected to the emitter terminals of the switching elements Q3 and Q4.

[0031] On the other hand, when the power supply device 90 does not supply power to the secondary coil 11, the power conversion unit 12 is configured to be used as part of a drive circuit that drives at least a part of the auxiliary machine 20 provided in the vehicle 2. The case where the power supply device 90 does not supply power to the secondary coil 11 includes the case where the non-contact charging device 1 does not charge the battery 4 while the vehicle 2 is parked or stopped, and the case where the vehicle 2 is running. The auxiliary machine 20 provided in the vehicle 2 corresponds to a device mounted on the vehicle 2 that is used while the vehicle 2 is running and is driven by electric energy. Specifically, it corresponds to the electric oil pump P that is operated when the vehicle 2 is running. Therefore, the drive circuit described above energizes the motor M that drives the electric oil pump P. In the present embodiment, the electric oil pump P is energized by a three-phase motor M (an example of a "motor").

[0032] In the present embodiment, the power conversion unit 12 is used as a drive circuit. The emitter terminal of the switching element Q3 of the leg 14A is connected to the U-phase terminal U of the three-phase motor M via the relay module RM. Also, the emitter terminal of the switching element Q3 of the leg 14B is connected to the V-phase terminal V of the three-phase motor M via the relay module RM. Further, the emitter terminal of the switching element Q3 of the leg 14C is connected to the W-phase terminal W of the three-phase motor M via the relay module RM. The relay module RM is controlled to be switched by the control unit 15. Specifically, when the power supply device 90 is supplying power to the secondary coil 11, the control unit 15 switches the relay module RM so that the three-phase motor M is electrically disconnected from the power conversion unit 12, and when the power supply device 90 is not supplying power to the secondary coil 11, the control unit 15 switches the relay module RM so that the three-phase motor M is electrically connected to the power conversion unit 12.

[0033] The power conversion unit 12 used as a drive circuit drives the switching elements Q3 and Q4 of two legs that are sequentially switched among the three legs 14A, 14B, and 14C to energize the three-phase motor M.

[0034] The control unit 15 drives the power conversion unit 12 so that the state in which current flows through the three-phase motor M switches in the following order: a first current conduction state in which current flows from the U-phase terminal U to the V-phase terminal V of the three-phase motor M; a second current conduction state in which current flows from the U-phase terminal U to the W-phase terminal W of the three-phase motor M; a third current conduction state in which current flows from the V-phase terminal V to the W-phase terminal W of the three-phase motor M; a fourth current conduction state in which current flows from the V-phase terminal V to the U-phase terminal U of the three-phase motor M; a fifth current conduction state in which current flows from the W-phase terminal W to the U-phase terminal U of the three-phase motor M; and a sixth current conduction state in which current flows from the W-phase terminal W to the V-phase terminal V of the three-phase motor M.

[0035] In the first conduction state, the switching element Q3 of leg 14A and the switching element Q4 of leg 14B are closed, and the other switching elements Q3 and Q4 are open. In the second conduction state, the switching element Q3 of leg 14A and the switching element Q4 of leg 14C are closed, and the other switching elements Q3 and Q4 are open. In the third conduction state, the switching element Q3 of leg 14B and the switching element Q4 of leg 14C are closed, and the other switching elements Q3 and Q4 are open. In the fourth conduction state, the switching element Q3 of leg 14B and the switching element Q4 of leg 14A are closed, and the other switching elements Q3 and Q4 are open. In the fifth conduction state, the switching element Q3 of leg 14C and the switching element Q4 of leg 14A are closed, and the other switching elements Q3 and Q4 are open. In the sixth conduction state, the switching element Q3 of the leg 14C and the switching element Q4 of the leg 14B are closed, and the other switching elements Q3 and Q4 are open.

[0036] When power is not supplied from the power supply device 90 to the secondary coil 11, the control unit 15 drives the power conversion unit 12 to switch between the first current supply state, the second current supply state, the third current supply state, the fourth current supply state, the fifth current supply state, and the sixth current supply state in this order. This causes the three-phase motor M to be energized, and makes it possible to operate the electric oil pump P by the three-phase motor M while the vehicle 2 is traveling.

[0037] As described above, in the contactless charging device 1 of the present embodiment, the driving of the switching elements Q3 and Q4 when the power conversion unit 12 converts AC power into DC power and the driving of the switching elements Q3 and Q4 when the driving circuit energizes the three-phase motor M are controlled by a single control unit 15. Thereby, since the control unit 15 can be shared between the driving of the switching elements Q3 and Q4 when the power conversion unit 12 converts AC power into DC power and the driving of the switching elements Q3 and Q4 when the driving circuit energizes the three-phase motor M, it is possible to suppress an increase in the size and cost of the contactless charging device 1.

[0038] Also, as described above, the power conversion unit 12 of the contactless charging device 1 not only converts the AC power transmitted from the primary coil 91 to the secondary coil 11 into DC power capable of charging the battery 4, but also serves as part of a driving circuit for driving the electric oil pump P provided in the vehicle 2. When used, the driving voltage of the three-phase motor M that drives the electric oil pump P can be increased compared to the case where the driving circuit is provided separately from the power conversion unit 12 of the contactless charging device 1. For this reason, for example, since the current value of the current flowing through the three-phase motor M becomes small, it is possible to reduce the Joule loss. Therefore, it is possible to increase the efficiency when driving the electric oil pump P.

[0039] 〔Other Embodiments〕 Next, other embodiments of the contactless charging device 1 will be described.

[0040] In the above embodiment, the power conversion unit 12 has been described as being used as part of a drive circuit that drives the auxiliary equipment 20 provided in the vehicle 2 when power is not supplied from the power supply device 90 to the secondary coil 11. However, the power conversion unit 12 may be configured so that a part of it is used as part of a drive circuit that drives the auxiliary equipment 20 provided in the vehicle 2 when power is not supplied from the power supply device 90 to the secondary coil 11. Furthermore, the power conversion unit 12 may be configured so that at least a part of it is used as a drive circuit that drives the auxiliary equipment 20 provided in the vehicle 2 when power is not supplied from the power supply device 90 to the secondary coil 11.

[0041] In the above embodiment, the accessory 20 has been described as an electric oil pump P that is operated when the vehicle 2 is traveling. However, the accessory 20 may be a device different from the electric oil pump P. Examples of such devices include an electric pump that circulates a coolant or refrigerant when the vehicle 2 is traveling, and a compressor for an air conditioner. The drive circuit may energize a motor that drives such an electric pump or compressor. Furthermore, the accessory 20 may be a drive motor (corresponding to the driving motor M) that drives the vehicle 2.

[0042] In the above embodiment, the auxiliary device 20 has been described as being a device energized by the three-phase motor M. However, as shown in Fig. 3, the auxiliary device 20 may be a device energized by a motor (e.g., a DC brush motor) different from the three-phase motor M. In this case, the power conversion unit 12 may be configured to include two legs 14A and 14B (i.e., the leg 14C in Fig. 2 does not need to be provided).

[0043] In the above-described embodiment, it has been described that the driving of the switching elements Q3 and Q4 when the power conversion unit 12 converts AC power into DC power and the driving of the switching elements Q3 and Q4 when the driving circuit energizes the three-phase motor M are controlled by a single control unit 15. However, it is also possible to configure the driving of the switching elements Q3 and Q4 when the power conversion unit 12 converts AC power into DC power and the driving of the switching elements Q3 and Q4 when the driving circuit energizes the three-phase motor M to be controlled by different control units.

[0044] In the above-described embodiment, it has been described that the switching elements Q1, Q2, Q3, and Q4 are n-type IGBTs. However, the switching elements Q1, Q2, Q3, and Q4 can also be configured using FETs (Field Effect Transistors), or can be configured using bipolar transistors.

[0045] In the above-described embodiment, it has been described that the control unit 15 drives the power conversion unit 12 so that the state in which current flows through the three-phase motor M switches in the order of the first energization state in which current flows from the U-phase terminal U to the V-phase terminal V of the three-phase motor M, the second energization state in which current flows from the U-phase terminal U to the W-phase terminal W of the three-phase motor M, the third energization state in which current flows from the V-phase terminal V to the W-phase terminal W of the three-phase motor M, the fourth energization state in which current flows from the V-phase terminal V to the U-phase terminal U of the three-phase motor M, the fifth energization state in which current flows from the W-phase terminal W to the U-phase terminal U of the three-phase motor M, and the sixth energization state in which current flows from the W-phase terminal W to the V-phase terminal V of the three-phase motor M. However, the state in which current flows through the three-phase motor M is an example, and can be changed according to, for example, the specifications of the three-phase motor M.

[0046] In the above-described embodiment, a configuration in which the power conversion unit 12 and the control unit 15 are provided separately has been described as an example. However, the power conversion unit 12 and the control unit 15 may be provided integrally instead of separately.

[0047] 〔Outline of the above embodiment〕 The following describes the outline of the contactless charging device 1 described above.

[0048] (1) The contactless charging device 1 is a contactless charging device 1 that can charge the battery 4 mounted on the vehicle 2, and includes a secondary coil 11 provided opposite to the primary coil 91 of the power supply device 90, and a power conversion unit 12 that converts the AC power transmitted from the primary coil 91 to the secondary coil 11 into DC power that can charge the battery 4. When the power supply device 90 does not supply power to the secondary coil 11, at least a part of the power conversion unit 12 is used as a part of a drive circuit that drives the auxiliary machine 20 provided on the vehicle 2.

[0049] The power conversion unit 12 that converts the AC power transmitted from the power supply device 90 into DC power that can charge the battery 4 is used when the vehicle 2 is parked or stopped for non-contact charging, and the drive circuit that drives the auxiliary machine 20 provided on the vehicle 2 is used when the vehicle 2 is running. Therefore, by configuring as described above, it is possible to use in combination the power conversion unit 12 that does not convert the power into DC power that can charge the battery 4 when the vehicle 2 is running, and the drive circuit that does not drive the auxiliary machine 20 provided on the vehicle 2 when the vehicle 2 is parked or stopped. Therefore, it is possible to reduce the size compared to the case where the power conversion unit 12 and the drive circuit are provided separately.

[0050] (2) In the contactless charging device 1 described in (1), the auxiliary machine 20 is an electric oil pump P that is operated when the vehicle 2 is running, and it is preferable that the drive circuit energizes the motor M that drives the electric oil pump P.

[0051] When the drive circuit energizes the motor M that drives the electric oil pump P, the voltage value of the voltage applied to the drive circuit is smaller than the voltage value of the voltage when charging the battery 4. For this reason, by using the power conversion unit 12 as a part of the drive circuit that drives the auxiliary machine 20 provided on the vehicle 2, the drive voltage of the electric oil pump P can be increased. Therefore, since the current value of the energized current becomes small and the Joule loss is reduced, it is possible to reduce the power loss.

[0052] (3) In the non-contact charging device 1 described in (1) or (2), the auxiliary machine 20 is a device energized by a three-phase motor M, and the power conversion unit 12 is provided with three legs 14A, 14B, and 14C each having at least two switching elements Q3 and Q4 connected in series with each other. The power conversion unit 12 drives the switching elements Q3 and Q4 included in each of the two preset legs 14A and 14B among the three legs 14A, 14B, and 14C to convert AC power into DC power, and the drive circuit drives the switching elements Q3 and Q4 included in two legs that are sequentially switched among the three legs 14A, 14B, and 14C to energize the three-phase motor M, which is preferable.

[0053] According to this configuration, in addition to the two legs 14A and 14B used to convert the battery 4 into DC power that can be charged, by simply providing the leg 14C, the power conversion unit 12 can be used as a drive circuit for energizing the three-phase motor M. Therefore, as described above, since the drive voltage of the three-phase motor M can be increased, it is possible to reduce power loss.

[0054] (4) In the non-contact charging device 1 described in (3), it is preferable that the driving of the switching elements Q3 and Q4 when the power conversion unit 12 converts AC power into DC power and the driving of the switching elements Q3 and Q4 when the drive circuit energizes the three-phase motor M are controlled by a single control unit 15.

[0055] According to this configuration, not only can the power conversion unit 12 be used as a drive circuit, but by also using the control unit 15 that controls these drives together, it is possible to further reduce the size.

Industrial Applicability

[0056] The technology according to the present disclosure can be used in a non-contact charging device that can non-contact charge a battery mounted on a vehicle.

Explanation of Signs

[0057] 1: Wireless charging device, 2: Vehicle, 4: Battery, 11: Secondary coil, 12: Power conversion unit, 14A: Leg, 14B: Leg, 14C: Leg, 15: Control unit, 20: Auxiliary equipment, 90: Power supply device, 91: Primary coil, M: Three-phase motor (motor), P: Electric oil pump, Q3: Switching element, Q4: Switching element

Claims

1. A contactless charging device capable of charging a battery mounted on a vehicle without contact, comprising: a secondary coil provided opposite to the primary coil of the power supply device; a power conversion unit that converts the alternating current power transmitted from the primary coil to the secondary coil into direct current power capable of charging the battery. The power conversion unit is a contactless charging device that is used as part of a drive circuit for driving at least a part of auxiliary machines provided on the vehicle when power is not supplied from the power supply device to the secondary coil.

2. The auxiliary machine is an electric oil pump that is operated when the vehicle is running, The drive circuit is the contactless charging device according to claim 1, which supplies power to a motor that drives the electric oil pump.

3. The auxiliary machine is a device energized by a three-phase motor, The power conversion unit is provided with three legs each having at least two switching elements connected in series with each other, The power conversion unit drives the switching elements of two preset legs out of the three legs to convert the alternating current power into the direct current power, and the drive circuit drives the switching elements of two legs that are sequentially switched out of the three legs to supply power to the three-phase motor. The contactless charging device according to claim 1 or 2.

4. The driving of the switching element when the power conversion unit converts the alternating current power into the direct current power and the driving of the switching element when the drive circuit supplies power to the three-phase motor are controlled by a single control unit. The contactless charging device according to claim 3.

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