Charging equipment for wired vehicle

Abstract

The utility model provides wired vehicle charging equipment (500A, 500B) which comprises vehicle-mounted chargers (600A, 600B), a bidirectional DC / DC converter (702), a battery pack (704) and an inverter (706), the bidirectional DC / DC converter (702) is connected with the vehicle-mounted chargers (600A, 600B), the battery pack (704) and the inverter (706) are connected with the bidirectional DC / DC converter (702), the vehicle-mounted chargers (600A, 600B) are connected with an alternating-current power grid (400) and comprise first inductance coils (606), and the battery pack (704) and the inverter (706) are connected with the bidirectional DC / DC converter (702). Wherein the bidirectional DC / DC converter (702) comprises a second inductance coil (702A); the first inductance coil (606) is used as a primary, the second inductance coil (702A) is used as a secondary, and the first inductance coil (606) and the second inductance coil (702A) form a common-magnetic-core transformer. According to the wired vehicle charging equipment, the equipment cost is reduced, the equipment size is reduced, and the equipment space structure is optimized.

Description

Technical Field

[0001] This application belongs to the technical field of charging, and particularly relates to a wired vehicle charging device. Background Art

[0002] In the wired vehicle charging devices of electric scooters, electric bicycles and other electric vehicles in the prior art, a non-vehicle-mounted charger is usually adopted and directly charges the vehicle's battery pack.

[0003] A non-vehicle-mounted charger in the prior art includes a rectifier bridge, a one-way switch, a transformer and an output circuit connected to an AC power grid. The transformer includes a first inductance coil as the primary and a second inductance coil as the secondary. The output circuit includes an output rectifier and an output filter. The input end of the output rectifier is connected to the second inductance coil of the transformer, the input end of the output filter is connected to the output end of the output rectifier, and the output end is connected to the vehicle-mounted battery pack.

[0004] Another non-vehicle-mounted charger in the prior art includes a power factor correction (PFC) circuit, a conversion circuit and an output circuit. The conversion circuit uses a DC / DC converter, which includes a DC / AC converter connected to the PFC circuit and a first coil connected to the DC / AC converter. The output circuit includes a second coil, an output rectifier and an output filter. The second coil is connected to the input end of the output rectifier, the input end of the output filter is connected to the output end of the output rectifier, and its output end is connected to the vehicle-mounted battery pack. Among them, the first inductance coil is used as the primary, and the second inductance coil is used as the secondary. The two together form a transformer with a common magnetic core.

[0005] It can be seen that the overall structure of the wired vehicle charging device in the prior art is relatively complex, the device volume is large and the device cost is high. Summary of the Utility Model

[0006] The purpose of this application is to provide a wired vehicle charging device, which simplifies the device structure, reduces the device volume and lowers the device cost compared with the prior art.

[0007] This application provides a wired vehicle charging device, including: a vehicle-mounted charger, a bidirectional DC / DC converter connected to the vehicle-mounted charger, a battery pack and an inverter respectively connected to the bidirectional DC / DC converter. Among them, the vehicle-mounted charger is used to be connected to an AC power grid and includes a first inductance coil; among them, the bidirectional DC / DC converter includes a second inductance coil; the first inductance coil is used as the primary, and the second inductance coil is used as the secondary. The two together form a transformer with a common magnetic core.

[0008] As a supplement or replacement to the above solution, the in-vehicle charger further includes a rectifier bridge and a bidirectional switch. Among them, the rectifier bridge is connected to the AC power grid, one end of the bidirectional switch is connected to the rectifier bridge, and the other end is connected to the first inductance coil; and the bidirectional DC / DC converter further includes a power switch tube connected to the second inductance coil.

[0009] As a supplement or replacement to the above solution, the in-vehicle charger further includes a power factor correction circuit and a DC / AC converter connected to the AC power grid. Among them, the input end of the DC / AC converter is connected to the power factor correction circuit, and the output end is connected to the first inductance coil; and the bidirectional DC / DC converter further includes a power switch tube connected to the second inductance coil.

[0010] As a supplement or replacement to the above solution, the bidirectional DC / DC converter is a boost bidirectional DC / DC converter, and the inverter is a voltage source inverter.

[0011] As a supplement or replacement to the above solution, the in-vehicle charger, the bidirectional DC / DC converter, and the inverter are arranged in the drive motor of the vehicle.

[0012] As a supplement or replacement to the above solution, the in-vehicle charger, the bidirectional DC / DC converter, the battery pack, and the inverter share a common mechanical shield and a PCB board, and are controlled by a common control unit.

[0013] As a supplement or replacement to the above solution, in the charging mode of the vehicle, the in-vehicle charger is in the working state, and the electric energy from the AC power grid is supplied to the battery pack through the rectifier bridge, the bidirectional switch, the first inductance coil, the second inductance coil, the bidirectional DC / DC converter, and the inverter in the in-vehicle charger. In the driving mode of the vehicle, the in-vehicle charger is in the non-working state, and the electric energy from the battery pack is supplied to the drive motor of the vehicle through the bidirectional DC / DC converter and the inverter.

[0014] As a supplement or replacement to the above solution, in the charging mode of the vehicle, the in-vehicle charger is in the working state, and the electric energy from the AC power grid is supplied to the battery pack through the power factor correction circuit, the DC / AC converter, the first inductance coil, the second inductance coil, the bidirectional DC / DC converter, and the inverter in the in-vehicle charger. In the driving mode of the vehicle, the in-vehicle charger is in the non-working state, and the electric energy from the battery pack is supplied to the drive motor of the vehicle through the bidirectional DC / DC converter and the inverter.

[0015] The wired vehicle charging device of the present application achieves the following beneficial technical effects

[0016] (1) In the wired vehicle charging device of the present application, the non-vehicle charger in the prior art is changed to a vehicle charger, which can share a mechanical shield (such as a housing) and a PCB board with the vehicle-mounted bidirectional DC / DC converter and inverter, and is controlled by a shared micro-control unit, simplifying the device structure, reducing the device volume and lowering the device cost.

[0017] (2) In the wired vehicle charging device of the present application, not only the inductor coil as the secondary of the transformer, the output rectifier and the output filter in the non-vehicle charger are eliminated, but also the inductor coil originally used as the primary of the transformer in the vehicle charger is still used as the primary of the transformer, and the inductor coil in the bidirectional DC / DC converter is used as the secondary of the transformer. The two form a transformer with a common magnetic core, thereby reducing the device cost, decreasing the device volume and optimizing the device spatial structure. Description of the Drawings

[0018] Figure 1 It is a structural block diagram of a wired vehicle charging device in the prior art.

[0019] Figure 2 is Figure 1 the specific circuit diagram of the vehicle charger in the wired vehicle charging device shown.

[0020] Figure 3 It is a structural block diagram of a wired vehicle charging device according to the first embodiment of the present application.

[0021] Figure 4 is Figure 3 the specific circuit diagram of the wired vehicle charging device shown.

[0022] Figure 5 It is a structural block diagram of a wired vehicle charging device according to the second embodiment of the present application.

[0023] Figure 6 is Figure 5 the specific circuit diagram of the wired vehicle charging device shown. Detailed Embodiments

[0024] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0025] In the description embodiments, claims, and the above-mentioned drawings of this application, terms such as "first", "second", and "third" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a method, system, product, or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0026] Figure 1 Fig. 4 shows a wired vehicle charging device 100 in the prior art, which includes a non-vehicle charger 200 and a vehicle-mounted charging device 300.

[0027] The non-vehicle charger 200 is connected to the AC power grid 400 and includes a rectifier bridge 202, a one-way switch 204, a transformer 206, and an output circuit 208 connected to the AC power grid 400. Among them, the rectifier bridge 202 includes two groups of parallel diodes. The one-way switch 204 is connected to the rectifier bridge 202. The transformer 206 includes a first inductance coil as the primary and a second inductance coil as the secondary, and the first inductance coil is connected to the one-way switch 204. The output circuit 208 includes an output rectifier and an output filter. The input end of the output rectifier is connected to the second inductance coil of the transformer 206, the input end of the output filter is connected to the output end of the output rectifier, and the output end is connected to the vehicle-mounted battery pack 302.

[0028] The vehicle-mounted charging device 300 includes a vehicle-mounted battery pack 302, a bidirectional DC / DC converter 304, and a voltage source inverter (VSI) 306. The VSI 306 is connected to the drive motor M of the vehicle to provide AC electric energy to the drive motor M.

[0029] Figure 2 Fig. Figure 1 shows the specific circuit diagram of the vehicle-mounted charging device 300 shown in Figure 2As shown, a capacitor C1 is provided between the positive and negative terminals of the battery pack 302. The bidirectional DC / DC converter 304 includes an inductor coil 304A and two power switching transistors S3 and S10. One end of the inductor coil 304A is connected to the positive terminal of the battery pack 302, and the other end is connected to the source of the power switching transistor S3 and the drain of the power switching transistor S10. The drain of the power switching transistor S3 is connected to the positive input terminal of the VSI 306, and the source of the power switching transistor S10 is connected to the negative input terminal of the VSI 306 and the negative terminal of the battery pack 302. A capacitor C2 is provided between the drain of the power switching transistor S3 and the source of S10. The VSI 306 is a three-phase bridge drive circuit, including six power switching transistors S1 - S9 that form a three-phase bridge. Its positive input terminal is connected to the drain of the power switching transistor S3, its negative input terminal is connected to the source of the power switching transistor S10, and its output terminal is connected to the drive motor M of the vehicle to provide AC electrical energy to the drive motor M.

[0030] It can be seen from this that the overall structure of the above-mentioned wired vehicle charger 100 in the prior art is relatively complex, the device volume is large, and the device cost is high.

[0031] As Figure 3 shown, a wired vehicle charger 500A according to the first embodiment of the present application includes an on-vehicle charger 600A, a bidirectional DC / DC converter (preferably a boost bidirectional DC / DC converter) 702 connected to the on-vehicle charger 600A, a battery pack 704 and an inverter (preferably a voltage source inverter VSI) 706 respectively connected to the bidirectional DC / DC converter 702. The inverter 706 is also connected to the drive motor M of the vehicle to provide AC electrical energy to the drive motor M.

[0032] The on-vehicle charger 600A is connected to the AC power grid 400 in a wired manner. The on-vehicle charger 600A includes a rectifier bridge 602, a bidirectional switch 604, and a first inductor coil 606. The input terminal of the rectifier bridge 602 is connected to the AC power grid 400, and the output terminal is connected to one end of the bidirectional switch 604. One end of the first inductor coil 606 is connected to the other end of the bidirectional switch 604, and the other end is connected to the bidirectional DC / DC converter 702.

[0033] As Figure 4 shown, the rectifier bridge 602 in the on-vehicle charger 600A includes diodes D1 - D4. Diodes D1 and D3 are connected in series to form a first diode group. Diodes D2 and D4 are connected in series to form a second diode group. The first diode group and the second diode group are connected in parallel. The positive terminal of the AC power grid 400 is connected to the anode of diode D1 and the cathode of diode D3, and the negative terminal is connected to the anode of diode D2 and the cathode of diode D4.

[0034] The bidirectional switch 604 includes two power switch tubes S1 and S2 connected oppositely. The drain of the power switch tube S2 is connected to the anodes of the diodes D3 and D4. The sources of the power switch tubes S1 and S2 are connected together. The drain of the power switch tube S1 is connected to one end of the first inductance coil 606, and the other end of the first inductance coil 606 is connected to the cathodes of the diodes D1 and D2 in the rectifier bridge 602.

[0035] The bidirectional DC / DC converter 702 includes a second inductance coil 702A and two power switch tubes S3 and S10. Among them, one end of the second inductance coil 702A is connected to the positive terminal of the battery pack 704, and the other end is connected to the source of the power switch tube S3 and the drain of the power switch tube S10. The drain of the power switch tube S3 is connected to the positive input terminal of the inverter 706. The source of the power switch tube S10 is connected to the negative input terminal of the inverter 706 and the negative terminal of the battery pack 704. A capacitor C2 is provided between the drain of the power switch tube S3 and the source of the power switch tube S10.

[0036] A capacitor C1 is provided between the positive and negative terminals of the battery pack 704.

[0037] The inverter 706 is a three-phase bridge arm drive circuit, including six power switch tubes S4 - S9 that form the three-phase bridge arm. Its positive input terminal (the drains of the power switch tubes S4 - S6) is connected to the drain of the power switch tube S3, its negative input terminal (the sources of the power switch tubes S7 - S9) is connected to the source of the power switch tube S10, and its output terminal (AC midpoint) is connected to the drive motor M of the vehicle to provide AC electric energy to the drive motor M.

[0038] It should be noted particularly that the first inductance coil 606 serves as the primary, the second inductance coil 702A serves as the secondary, and the first inductance coil 606 and the second inductance coil 702A form a common magnetic core transformer.

[0039] The wired vehicle charging device 500A according to the first embodiment of the present application, in the charging mode of the vehicle, the bidirectional switch 604 is turned on and off according to a predetermined duty ratio, the on-vehicle charger 600A is in an operating state, and the AC power grid 400, the rectifier bridge 602 in the on-vehicle charger 600A, the bidirectional switch 604, the first inductance coil 606, the second inductance coil 702A, the bidirectional DC / DC converter 702, the inverter 706, and the battery pack 704 are electrically connected in sequence. The electric energy output by the AC power grid 400 is sequentially passed through the rectifier bridge 602 in the on-vehicle charger 600A, the bidirectional switch 604, the first inductance coil 606, and the transformer composed of the second inductance coil 702A in the bidirectional DC / DC converter 702, the bidirectional DC / DC converter 702, and the inverter 706 to charge the battery pack 704. That is, in the charging mode of the vehicle, the rectifier bridge 602, the bidirectional DC / DC converter 702, and the inverter 706 in the on-vehicle charger 600A are in an operating state, and at least one arm in the inverter 706 is turned on.

[0040] The wired vehicle charging device 500A according to the first embodiment of the present application, in the driving mode of the vehicle, the on-vehicle charger 600A is in a non-operating state, and the battery pack 704, the bidirectional DC / DC converter 702, and the inverter 706 are electrically connected in sequence. The electric energy from the battery pack 704 is provided to the drive motor M of the vehicle via the bidirectional DC / DC converter 702 and the inverter 706. That is, in the driving mode of the vehicle, the bidirectional switch 604 in the on-vehicle charger 600A remains off, and the on-vehicle charger 600A is in a non-operating state. Both the bidirectional DC / DC converter 702 and the inverter 706 are in an operating state.

[0041] As Figure 5 shown, the wired vehicle charging device 500B according to the second embodiment of the present application includes a bidirectional DC / DC converter 702, an inverter 706, and a battery pack 704, which are the same as those in the first embodiment. The difference between the second embodiment and the first embodiment lies in the on-vehicle charger.

[0042] Specifically, the on-vehicle charger 600B in the second embodiment includes a power factor correction circuit 608 connected to the AC power grid 400, a DC / AC converter 610, and a first inductance coil 606. Among them, the input end of the DC / AC converter 610 is connected to the power factor correction circuit 608, and the output end is connected to the first inductance coil 606. The first inductance coil 606 in the on-vehicle charger 600B is used as the primary, and the second inductance coil 702A in the bidirectional DC / DC converter 702 is used as the secondary, and the two together form a transformer with a common magnetic core.

[0043] As Figure 6As shown, the power factor correction circuit 608 in the in-vehicle charger 600B includes diodes D1 - D5, an inductor L1, a capacitor C3, and a power switch S1. Diodes D1 and D3 are connected in series to form a first diode group. Diodes D2 and D4 are connected in series to form a second diode group. The first diode group and the second diode group are connected in parallel. The positive terminal of the AC power grid 400 is connected to the anode of diode D1 and the cathode of diode D3, and the negative terminal is connected to the anode of diode D2 and the cathode of diode D4.

[0044] The inductor L1 is connected between the cathodes of diodes D1 and D2 and the anode of diode D5. The capacitor C3 is connected between the anodes of diodes D3 and D4 and the cathode of diode D5. The power switch S1 is connected between the anodes of diodes D3 and D4 and the anode of diode D5.

[0045] The DC / AC converter 610 includes four power switches S2 - S5 that form a double-bridge arm bridge circuit. Its positive input terminal is connected to the cathode of diode D5, and its negative input terminal is connected to the anodes of diodes D3 and D4. The midpoint of the first bridge arm composed of power switches S2 and S4 is connected to one end of the first inductor coil 606, and the midpoint of the second bridge arm composed of power switches S3 and S5 is connected to the other end of the first inductor coil 606.

[0046] The bidirectional DC / DC converter 702 includes a second inductor coil 702A and two power switches S6 and S7. One end of the second inductor coil 702A is connected to the positive terminal of the battery pack 704, and the other end is connected to the source of power switch S6 and the drain of power switch S7. The drain of power switch S6 is connected to the positive input terminal of the inverter 706. The source of power switch S7 is connected to the negative input terminal of the inverter 706 and the negative terminal of the battery pack 704. A capacitor C2 is provided between the drain of power switch S6 and the source of S7.

[0047] A capacitor C1 is provided between the positive and negative terminals of the battery pack 704.

[0048] The inverter 706 is a three-phase bridge arm drive circuit, including six power switches S8 - S13 that form a three-phase bridge arm. Its positive input terminal (the drains of power switches S8 - S10) is connected to the drain of power switch S6, its negative input terminal (the sources of power switches S11 - S13) is connected to the source of power switch S7, and its output terminal (AC midpoint) is connected to the drive motor M of the vehicle to provide AC electrical energy to the drive motor M.

[0049] It should be noted in particular that the first inductor coil 606 is used as the primary, and the second inductor coil 702A is used as the secondary. The first inductor coil 606 and the second inductor coil 702A form a common magnetic core transformer.

[0050] For the wired vehicle charging device 500B according to the second embodiment of the present application, in the charging mode of the vehicle, the on-vehicle charger 600B is in the working state, and the power factor adjustment circuit 608, DC / AC converter 610, first inductor coil 606, second inductor coil 702A, bidirectional DC / DC converter 702, inverter 706, and battery pack 704 in the AC power grid 400 and the on-vehicle charger 600B are electrically connected in sequence. The electric energy output by the AC power grid 400 is sequentially passed through the power factor adjustment circuit 608, DC / AC converter 610, transformer composed of the first inductor coil 606 and the second inductor coil 702A, bidirectional DC / DC converter 702, and inverter 706 in the on-vehicle charger 600B to charge the battery pack 704. That is, in the charging mode of the vehicle, the power factor adjustment circuit 608, DC / AC converter 610, bidirectional DC / DC converter 702, and inverter 706 in the on-vehicle charger 600B are all in the working state, and at least one of the three bridge arms of the inverter 706 is conducting.

[0051] For the wired vehicle charging device 500B according to the second embodiment of the present application, in the driving mode of the vehicle, the on-vehicle charger 600B is in the non-working state, and the battery pack 704, bidirectional DC / DC converter 702, and inverter 706 are electrically connected in sequence. The electric energy from the battery pack 704 is provided to the drive motor M of the vehicle via the bidirectional DC / DC converter 702 and the inverter 706. That is, in the driving mode of the vehicle, the power factor adjustment circuit 608 and DC / AC converter 610 in the on-vehicle charger 600B do not work, while the bidirectional DC / DC converter 702 and inverter 706 are both in the working state.

[0052] Preferably, the on-vehicle chargers 600A / 600B, bidirectional DC / DC converter 702, battery pack 704, and inverter 706 share a common mechanical shield and a PCB board and are controlled by a common micro-control unit.

[0053] Based on different specific application scenarios, the bidirectional DC / DC converter 702 and the inverter 706 in the wired vehicle charging devices 500A / 500B of the present application can be arranged outside or inside the drive motor M.

[0054] The wired vehicle charging device of the present application can be used for two-wheel vehicles or four-wheel vehicles.

[0055] Compared with the prior art, the wired vehicle charging device of the present application achieves the following beneficial technical effects:

[0056] (1) In the wired vehicle charging device of the present application, the non-vehicle-mounted charger in the prior art is changed to a vehicle-mounted charger, which can share a mechanical shielding housing and a PCB board with the vehicle-mounted bidirectional DC / DC converter and inverter, and is controlled by a shared micro control unit, reducing the device cost.

[0057] (2) In the wired vehicle charging device of the present application, not only the output circuit (including the output rectifier and output filter) in the non-vehicle-mounted charger and the inductance coil as the secondary of the transformer are eliminated, but also the inductance coil originally used as the primary of the transformer in the vehicle-mounted charger continues to be used as the primary of the transformer, and the inductance coil in the vehicle-mounted bidirectional DC / DC converter is used as the secondary of the transformer. The two form a transformer with a common magnetic core, thereby reducing the device cost and optimizing the device space structure.

[0058] It can be understood that the above specific embodiments are merely exemplary embodiments adopted to illustrate the principle of the present application and do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A wired vehicle charging device (500A, 500B), characterized in that, Comprising: On-vehicle chargers (600A, 600B), a bidirectional DC / DC converter (702) connected to the on-vehicle chargers (600A, 600B), a battery pack (704) and an inverter (706) respectively connected to the bidirectional DC / DC converter (702), wherein, the on-vehicle chargers (600A, 600B) are connected to an AC power grid (400), and include a first inductance coil (606); wherein, the bidirectional DC / DC converter (702) includes a second inductance coil (702A); The first inductance coil (606) serves as the primary, and the second inductance coil (702A) serves as the secondary, and the two together form a transformer with a common magnetic core.

2. The wired vehicle charging device according to claim 1, characterized in that The on-vehicle charger (600A) further includes a rectifier bridge (602) and a bidirectional switch (604), wherein, the rectifier bridge (602) is connected to the AC power grid (400), one end of the bidirectional switch (604) is connected to the rectifier bridge (602), the other end is connected to one end of the first inductance coil (606), and the other end of the first inductance coil (606) is connected to the rectifier bridge (602); and The bidirectional DC / DC converter (702) further includes power switching tubes (S3, S10) connected to the second inductance coil (702A).

3. The wired vehicle charging device according to claim 1, wherein The on-vehicle charger (600B) further includes a power factor correction circuit (608) and a DC / AC converter (610) connected to the AC power grid (400), wherein, the input end of the DC / AC converter (610) is connected to the power factor correction circuit (608), and the output end is connected to the first inductance coil (606); and The bidirectional DC / DC converter (702) further includes power switching tubes (S6, S7) connected to the second inductance coil (702A).

4. The wired vehicle charging device according to any one of claims 1 to 3, characterized in that The bidirectional DC / DC converter (702) is a boost bidirectional DC / DC converter, and the inverter (706) is a voltage source inverter.

5. The wired vehicle charging device according to claim 4, wherein, The bidirectional DC / DC converter (702) and the inverter (706) are disposed in a drive motor of the vehicle.

6. The wired vehicle charging device according to any one of claims 1-3, characterized in that, The on-vehicle chargers (600A, 600B), the bidirectional DC / DC converter (702), the battery pack (704) and the inverter (706) share a common mechanical shield and a PCB board, and are controlled by a common control unit.

7. The wired vehicle charging device according to claim 2, wherein In the charging mode of the vehicle, the on-vehicle charger (600A) is in a working state, the AC power grid (400), the rectifier bridge (602) in the on-vehicle charger (600A), the bidirectional switch (604), the first inductance coil (606), the second inductance coil (702A), the bidirectional DC / DC converter (702), the inverter (706) and the battery pack (704) are electrically connected in sequence, and the electric energy from the AC power grid (400) charges the battery pack (704), and In the driving mode of the vehicle, the on-vehicle charger (600A) is in a non-operating state, and the battery pack (704), the bidirectional DC / DC converter (702), and the inverter (706) are electrically connected in sequence. Electrical energy from the battery pack (704) drives the drive motor of the vehicle.

8. The wired vehicle charging device according to claim 3, wherein In the charging mode of the vehicle, the on-vehicle charger (600B) is in an operating state, and the AC power grid (400), the power factor correction circuit (608) in the on-vehicle charger (600B), the DC / AC converter (610), the first inductance coil (606), the second inductance coil (702A), the bidirectional DC / DC converter (702), the inverter (706), and the battery pack (704) are electrically connected in sequence. Electrical energy from the AC power grid (400) charges the battery pack (704), and In the driving mode of the vehicle, the on-vehicle charger (600B) is in a non-operating state, and the battery pack (704), the bidirectional DC / DC converter (702), and the inverter (706) are electrically connected in sequence. Electrical energy from the battery pack (704) drives the drive motor of the vehicle.

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