Vehicle-mounted device and vehicle charging equipment

Abstract

A vehicle-mounted device (700A, 700B) and a vehicle charging apparatus (500A, 500B) including the same, the vehicle-mounted device including an inverter (704A, 702B) including a first inductance coil (7042A, 7022B) and connected to a drive motor of a vehicle, the first inductance coil serving as a secondary of a transformer in a charging mode of the vehicle; a bidirectional DC / DC converter (706A, 704B) that is connected to the inverter; and a battery pack (708A, 706B) that is connected to the bidirectional DC / DC converter. The vehicle charging equipment comprises a non-vehicle-mounted charger (600A, 600B) and the vehicle-mounted device, the non-vehicle-mounted charger or the vehicle-mounted device comprises a conversion circuit (702A, 604B), and the conversion circuit comprises a DC / AC converter (7022A, 6042B) and a second inductance coil (7024A, 6044B). The second inductance coil is used as a primary, the first inductance coil is used as a secondary, and the first inductance coil and the second inductance coil jointly form a transformer. According to the vehicle-mounted device and the vehicle charging equipment, the structure is simplified, the cost is reduced, and the size of the vehicle-mounted device is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging, and particularly relates to a vehicle-mounted device and a vehicle charging device. Background Art

[0002] The vehicle charging devices of electric vehicles in the prior art include two types: a wired vehicle charging device and a wireless vehicle charging device.

[0003] The wired vehicle charging device in the prior art generally includes a non-vehicle-mounted charger and a vehicle-mounted device connected by wire. The non-vehicle-mounted charger is connected to the AC power grid and includes a power factor correction (PFC) circuit, a conversion circuit, and an output circuit connected to the AC power grid. Among them, the conversion circuit uses a first DC / DC converter, which includes a DC / AC converter connected to the PFC circuit and a first inductance coil connected to the DC / AC converter. The output circuit includes a second inductance coil, an output rectifier connected to the second inductance coil, and an output filter connected to the output rectifier. Among them, the first inductance coil serves as the primary, and the second inductance coil serves as the secondary, and the two form a transformer with a common magnetic core. The vehicle-mounted device includes a battery pack connected to the output filter in the output circuit, a second DC / DC converter connected to the battery pack, and a current source inverter (CSI) connected to the second DC / DC converter. The CSI is also connected to the drive motor of the vehicle to provide AC power to the drive motor.

[0004] The wireless vehicle charging device in the prior art generally includes a non-vehicle-mounted charger and a vehicle-mounted device connected wirelessly. The non-vehicle-mounted charger is connected to the AC power grid and includes a power factor correction (PFC) circuit and a conversion circuit. Among them, the conversion circuit uses a first DC / DC converter, which includes an AC / DC converter connected to the PFC circuit and a first inductance coil connected to the AC / DC converter. The vehicle-mounted device includes a receiving circuit, a battery pack connected to the receiving circuit, a second DC / DC converter connected to the battery pack, and a current source inverter (CSI) connected to the second DC / DC converter. Among them, the CSI is connected to the drive motor of the vehicle to provide AC power to the drive motor. Among them, the receiving circuit includes a second inductance coil, an input rectifier connected to the second inductance coil, and an input filter connected to the input rectifier. Among them, the first inductance coil is used as a transmitter, and the second inductance coil is used as a receiver, and the electric energy from the AC power grid is transmitted to the vehicle-mounted device through electromagnetic coupling between the two.

[0005] It can be seen that the structures of the wired / wireless vehicle charging devices and the vehicle-mounted devices included therein in the prior art are relatively complex and the costs are relatively high. Summary of the Invention

[0006] An object of the present invention is to provide a vehicle-mounted device with a simplified structure and reduced cost.

[0007] Another object of the present invention is to provide a vehicle charging device with a simplified structure and reduced cost.

[0008] According to one aspect of the present invention, there is provided a vehicle-mounted device for a vehicle charging device, the vehicle charging device including a non-vehicle charger, characterized in that the vehicle-mounted device includes: an inverter, the inverter including a first inductance coil and being connected to a drive motor of the vehicle, wherein, in a charging mode of the vehicle, the first inductance coil serves as a secondary of a transformer; a bidirectional DC / DC converter, connected to the inverter; and a battery pack, connected to the bidirectional DC / DC converter.

[0009] As a supplement or replacement to the above solution, the inverter further includes a three-phase bridge arm drive circuit, wherein one end of the first inductance coil is connected to a positive output terminal of the DC / DC converter, the other end is connected to a positive input terminal of the three-phase bridge arm drive circuit, a negative input terminal of the three-phase bridge arm drive circuit is connected to a negative output terminal of the bidirectional DC / DC converter, and an output terminal is connected to the drive motor of the vehicle to provide AC electric energy to the drive motor.

[0010] As a supplement or replacement to the above solution, the inverter is a current source inverter.

[0011] As a supplement or replacement to the above solution, the vehicle-mounted device further includes a conversion circuit, the conversion circuit including: a DC / AC converter, which is detachably connected to the non-vehicle charger in the vehicle charging device; and a second inductance coil, which is connected to the DC / AC converter, wherein the second inductance coil serves as a primary, and the first inductance coil serves as a secondary, and the two together form the transformer.

[0012] As a supplement or replacement to the above solution, the vehicle charging device includes a non-vehicle charger connected to an AC power grid, in a charging mode of the vehicle, the bidirectional DC / DC converter transmits electric energy from the AC power grid to the battery pack, and in a driving mode of the vehicle, the bidirectional DC / DC converter transmits electric energy from the battery pack to the drive motor of the vehicle.

[0013] As a supplement or replacement to the above solution, the bidirectional DC / DC converter and the inverter are disposed in the drive motor of the vehicle.

[0014] According to another aspect of the present invention, there is provided a vehicle charging device, characterized in that the vehicle charging device includes the on-vehicle device described above; and a non-vehicle charger, which is connected to the AC power grid and the on-vehicle device.

[0015] As a supplement or replacement to the above solution, the non-vehicle charger includes a power factor correction circuit connected to the AC power grid.

[0016] As a supplement or replacement to the above solution, the vehicle charging device further includes a conversion circuit, which is arranged in the non-vehicle charger or the on-vehicle device, and includes a DC / AC converter connected to the power factor correction circuit in the non-vehicle charger; and a second inductance coil connected to the DC / AC converter, wherein the second inductance coil serves as the primary, and the first inductance coil in the on-vehicle device serves as the secondary, and the two together form a transformer.

[0017] As a supplement or replacement to the above solution, the vehicle charging device is a wireless vehicle charging device, the conversion circuit is arranged in the non-vehicle charger, the second inductance coil serves as a transmitter, and the first inductance coil serves as a receiver, and the two together form an air-coreless air transformer. In the charging mode of the vehicle, the second inductance coil in the non-vehicle charger is arranged adjacent to the first inductance coil in the on-vehicle device, and power is transmitted through electromagnetic coupling. The electric energy output from the AC power grid sequentially passes through the non-vehicle charger, the DC / AC converter in the conversion circuit, the air transformer formed by the first inductance coil and the second inductance coil, the inverter, and the bidirectional DC / DC converter to charge the battery pack, and in the driving mode of the vehicle, the electric energy output from the battery pack sequentially passes through the inverter and the bidirectional DC / DC converter in the on-vehicle device and is output to the driving motor of the vehicle.

[0018] As a supplement or replacement to the above solution, the vehicle charging device is a wired vehicle charging device. The conversion circuit is arranged in the vehicle-mounted device. The second inductance coil serves as the primary, and the first inductance coil serves as the secondary. The two together form a transformer with a common magnetic core. In the charging mode of the vehicle, the off-vehicle charger is connected to the vehicle-mounted device. The electric energy output from the AC power grid sequentially passes through the off-vehicle charger, the DC / AC converter in the conversion circuit in the vehicle-mounted device, the transformer composed of the first inductance coil and the second inductance coil, the inverter, and the bidirectional DC / DC converter to charge the battery pack. And in the driving mode of the vehicle, the off-vehicle charger is separated from the vehicle-mounted device. The electric energy output from the battery pack sequentially passes through the conversion circuit in the vehicle-mounted device, the inverter, and the bidirectional DC / DC converter, and is output to the driving motor of the vehicle.

[0019] The vehicle-mounted device and the vehicle charging device of the present invention achieve the following beneficial technical effects

[0020] (1) When the vehicle charging device of the present invention is a wireless vehicle charging device, not only the receiving circuit (including the inductance coil as the receiver, the input rectifier, and the input filter) in the vehicle-mounted device of the device is eliminated, but also the inductance coil in the conversion circuit of the off-vehicle charger is used as the transmitter (the primary of the air transformer), and the inductance coil in the inverter in the vehicle-mounted device is reused as the receiver (the secondary of the air transformer), simplifying the structure of the vehicle charging device and the vehicle-mounted device, reducing the volume of the vehicle-mounted device, and reducing the cost of the vehicle charging device and the vehicle-mounted device.

[0021] (2) When the vehicle charging device of the present invention is a wired vehicle charging device, not only the output circuit (including the inductance coil as the secondary of the transformer, the output rectifier, and the output filter) in the off-vehicle charger is eliminated, but also the converter circuit in the off-vehicle charger is arranged in the vehicle-mounted device. The inductance coil in the converter circuit is used as the primary of the transformer, and the inductance coil in the inverter is reused as the secondary of the transformer, simplifying the structure of the vehicle charging device, reducing the volume of the off-vehicle charger, and reducing the cost of the vehicle charging device. Description of the Drawings

[0022] Figure 1 It is a structural block diagram of a wired vehicle charging device in the prior art.

[0023] Figure 2 It is a structural block diagram of a wireless vehicle charging device in the prior art.

[0024] Figure 3 For Figure 1 Or Figure 2Schematic diagram of the in-vehicle device in the vehicle charging device shown in the figure.

[0025] Figure 4A It is a block diagram of the structure of a wired vehicle charging device according to an embodiment of the present invention.

[0026] Figure 4B For Figure 4A Schematic diagram of the structure of the wired vehicle charging device shown in the figure.

[0027] Figure 4C For Figure 4A Specific circuit diagram of the wired vehicle charging device shown in the figure.

[0028] Figure 5A It is a block diagram of the structure of a wireless vehicle charging device according to another embodiment of the present invention.

[0029] Figure 5B For Figure 5A Schematic diagram of the structure of the wireless vehicle charging device shown in the figure.

[0030] Figure 5C For Figure 5A Specific circuit diagram of the wireless vehicle charging device shown in the figure. Detailed implementation manners

[0031] 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.

[0032] The terms "first", "second", and "third", etc. in the description embodiments, claims, and the above-mentioned drawings of the present application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a method, product, or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0033] As Figure 1 Shown in the figure, a wired vehicle charging device 100A of the prior art includes a non-vehicle charger 200A and an in-vehicle device 300A connected by wire.

[0034] The non-vehicle charger 200A is connected to the AC power grid 400, and includes a power factor correction (PFC) circuit 202A, a conversion circuit 204A, and an output circuit 206A connected to the AC power grid 400.

[0035] The conversion circuit 204A employs a first DC / DC converter, which includes a DC / AC converter 2042A connected to the PFC circuit 202A and a first inductance coil 2044A connected to the DC / AC converter 2042A.

[0036] The output circuit 206A includes a second inductance coil 2062A, an output rectifier 2064A connected to the second inductance coil 2062A, and an output filter 2066A connected to the output rectifier 2064A.

[0037] Among them, the first inductance coil 2044A serves as the primary, and the second inductance coil 2062A serves as the secondary, and the two form a transformer with a common magnetic core.

[0038] The vehicle-mounted device 300A includes a battery pack 302A connected to the output filter 2066A in the output circuit 206A, a second DC / DC converter 304A connected to the battery pack 302A, and a current source inverter (CSI) 306A connected to the second DC / DC converter 304A. The CSI 306A is also connected to the drive motor M of the vehicle to supply AC electrical energy to the drive motor M.

[0039] In the charging mode of the vehicle, the off-vehicle charger 200A (including the output filter 2066A therein) is wired to the vehicle-mounted device 300A (including the battery pack 302A therein).

[0040] As Figure 2 shown, a prior art wireless vehicle charger 100B includes an off-vehicle charger 200B and a vehicle-mounted device 300B that are wirelessly connected.

[0041] The off-vehicle charger 200B is connected to the AC power grid 400 and includes a power factor correction (PFC) circuit 202B and a conversion circuit 204B connected to the AC power grid 400.

[0042] The conversion circuit 204B employs a first DC / DC converter, which includes a DC / AC converter 2042B connected to the PFC circuit 202B and a first inductance coil 2044B connected to the DC / AC converter 2042B.

[0043] The vehicle-mounted device 300B includes a receiving circuit 302B, a battery pack 304B connected to the receiving circuit 302B, a second DC / DC converter 306B connected to the battery pack 304B, and a current source inverter (CSI) 308B connected to the second DC / DC converter 306B. Among them, the CSI 308B is connected to the drive motor M of the vehicle to supply AC electrical energy to the drive motor M.

[0044] The receiving circuit 302B includes a second inductance coil 3022B, an input rectifier 3024B connected to the second inductance coil 3022B, and an input filter 3026B connected to the input rectifier 3024B.

[0045] Among them, the first inductance coil 2044B serves as a transmitter, and the second inductance coil 3022B serves as a receiver. Electric energy from the AC power grid 400 is transmitted to the vehicle-mounted device 300B through electromagnetic coupling between the two. In other words, the first inductance coil 2044B is the primary, and the second inductance coil 3022B is the secondary, and the two form an air-coreless air transformer.

[0046] In the charging mode of the vehicle, the first inductance coil 2044B in the off-vehicle charger 200B and the second inductance coil 3022B in the vehicle-mounted device 300B (i.e., the primary and secondary of the air transformer) are electromagnetically coupled to transmit the electric energy from the AC power grid 400 to the vehicle-mounted device 300B.

[0047] As Figure 3 shown, the CSI 306A / 308B in the vehicle-mounted devices 300A / 300B of the wired vehicle charging device 100A or the wireless vehicle charging device 100B includes an inductance coil 3062A / 3082B connected to the positive output terminal of the second DC / DC converter 304A / 306B and a three-phase bridge arm drive circuit 3064A / 3084B. The input terminals of the three-phase bridge arm drive circuit 3064A / 3084B are respectively connected to the negative output terminal of the second DC / DC converter 304A / 306B and the inductance coil 3062A / 3082B, and its output terminal is connected to the drive motor M of the vehicle to provide AC electric energy to the drive motor M. The three-phase bridge arm drive circuit 3064A / 3084B includes six switching tubes S1 - S6 and six diodes D1 - D6 that form the three-phase bridge arm.

[0048] It can be seen that the structures of the existing wired / wireless vehicle charging devices 100A / 100B and the vehicle-mounted devices 300A / 300B they include are relatively complex and the costs are relatively high.

[0049] As Figure 4A shown, a wired vehicle charging device 500A according to the first embodiment of the present invention includes an off-vehicle charger 600A and a vehicle-mounted device 700A.

[0050] The off-vehicle charger 600A is connected to the AC power grid 400 and only includes a power factor correction (PFC) circuit 602A connected to the AC power grid 400.

[0051] The in-vehicle device 700A includes a conversion circuit 702A, an inverter 704A connected to the conversion circuit 702A (a current source inverter CSI is adopted in this embodiment), a bidirectional DC / DC converter 706A connected to the inverter 704A, and a battery pack 708A connected to the bidirectional DC / DC converter 706A. Among them, the inverter 704A is also connected to the drive motor M of the vehicle to supply AC electric energy to the drive motor M.

[0052] As Figure 4B shown, the conversion circuit 702A is a DC / DC converter, which includes a DC / AC converter 7022A detachably connected to the PFC circuit 602A and a first inductance coil 7024A connected to the DC / AC converter 7022A and serving as the primary of the transformer.

[0053] The inverter 704A includes a second inductance coil 7042A and a three-phase bridge arm drive circuit 7044A. One end of the second inductance coil 7042A is connected to the positive output terminal of the bidirectional DC / DC converter 706A, and the other end is connected to the positive input terminal of the three-phase bridge arm drive circuit 7044A. The negative input terminal of the three-phase bridge arm drive circuit 7044A is connected to the negative output terminal of the bidirectional DC / DC converter 706A, and the output terminal (its AC midpoint) is connected to the drive motor M of the vehicle to supply AC electric energy to the drive motor M.

[0054] As Figure 4C shown, the power factor correction circuit 602A in the off-vehicle charger 600A 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. 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.

[0055] The conversion circuit 702A includes a DC / AC converter 7022A and a first inductance coil 7024A. The DC / AC converter 7022A includes four power switching transistors S2 - S5 that form a double-bridge arm bridge circuit. Its positive input terminal (the drains of power switching transistors S2 and S3) is connected to the cathode of diode D5, and its negative input terminal (the sources of power switching transistors S4 and S5) is connected to the anodes of diodes D3 and D4. The midpoint of the first bridge arm formed by power switching transistors S2 and S4 is connected to one end of the first inductance coil 7024A, and the midpoint of the second bridge arm formed by power switching transistors S3 and S5 is connected to the other end of the first inductance coil 7024A.

[0056] The inverter 704A includes a second inductance coil 7042A and a three-phase bridge arm driving circuit 7044A. The three-phase bridge arm driving circuit 7044A includes six power switching transistors S8 - S13 and six diodes D8 - D13 that form a three-phase bridge arm. Its positive input terminal (the drains of power switching transistors S8, S9, and S10) is connected to one end of the second inductance coil 7042A, its negative input terminal (the cathodes of diodes D9, D11, and D13) is connected to the negative output terminal of the bidirectional DC / DC converter 706A, and its output terminal (AC midpoint) is connected to the drive motor M of the vehicle to supply AC electric energy to the drive motor M.

[0057] The bidirectional DC / DC converter 706A includes two power switching transistors S6 - S7 and two diodes D6 - D7. Among them, the cathode of diode D6 and the drain of power switching transistor S6 are connected to the positive extreme of the battery pack 708A. The anode of diode D6 is connected to the drain of power switching transistor S7 and is connected to the negative input terminal of the three-phase bridge arm driving circuit 7044A. The anode of diode D7 and the source of power switching transistor S7 are connected to the negative extreme of the battery pack 708A. The cathode of diode D7 is connected to the source of power switching transistor S6 and is connected to the other end of the second inductance coil 7042A.

[0058] A capacitor C1 is provided between the positive and negative extreme ends of the battery pack 708A.

[0059] It should be noted particularly that the first inductance coil 7024A serves as the primary of the transformer, and the second inductance coil 7042A serves as the secondary of the transformer. The two form a transformer with a common magnetic core.

[0060] When the wired vehicle charging device 500A according to an embodiment of the present invention operates in the charging mode of the vehicle, the PFC circuit 602A in the off-vehicle charger 600A is wired-connected to the AC / DC converter 7022A in the vehicle device 700A. The PFC circuit 602A in the off-vehicle charger 600A, the conversion circuit 702A, the inverter 704A, and the bidirectional DC / DC converter 706A in the vehicle device 700A are in working states, and at least one of the three bridge arms of the three-phase bridge arm drive circuit 7044A of the inverter 704A is turned on. The electric energy output by the AC power grid 400 sequentially passes through the PFC circuit 602A in the off-vehicle charger 600A, the DC / AC converter 7022A in the vehicle device 700A, the transformer composed of the first inductance coil 7024A and the second inductance coil 7042A, the three-phase bridge arm drive circuit 7044A, and the bidirectional DC / DC converter 706A to charge the battery pack 708A.

[0061] When the wired vehicle charging device 500A according to an embodiment of the present invention operates in the driving mode of the vehicle, the off-vehicle charger 600A is separated from the vehicle device 700A. Therefore, the PFC circuit 602A in the off-vehicle charger 600A does not work. The inverter 704A and the bidirectional DC / DC converter 706A in the vehicle device 700A are both in working states. The electric energy output by the battery pack 708A sequentially passes through the bidirectional DC / DC converter 706A and the inverter 704A in the vehicle device 700A and is output to the drive motor M of the vehicle.

[0062] Compared with the prior art, the wired vehicle charging device 500A of the present invention achieves the following beneficial technical effects:

[0063] (1) The output circuit in the off-vehicle charger (including the coil as the secondary of the transformer, the output rectifier, and the output filter) is eliminated, the structure of the vehicle charging device is simplified, and the cost of the vehicle charging device is reduced.

[0064] (2) The converter circuit in the off-vehicle charger is arranged in the vehicle device. The coil in the converter circuit is used as the primary of the transformer, and the inductance coil in the inverter is reused as the secondary of the transformer. The two form a transformer with a common magnetic core, thereby simplifying the structure of the vehicle charging device, reducing the volume of the off-vehicle charger, and reducing the cost of the vehicle charging device.

[0065] As Figure 5A shown, a wireless vehicle charging device 500B according to another embodiment of the present invention includes an off-vehicle charger 600B and a vehicle device 700B.

[0066] The off-vehicle charger 600B is connected to the AC power grid 400, and includes a power factor correction (PFC) circuit 602B connected to the AC power grid 400 and a conversion circuit 604B connected to the PFC circuit 602B.

[0067] The conversion circuit 604B is a DC / DC converter, which includes a DC / AC converter 6042B connected to the PFC circuit 602B and a first inductance coil 6044B connected to the DC / AC converter 6042B and used as a transmitter.

[0068] The on-vehicle device 700B includes an inverter 702B (a current source inverter CSI is adopted in this embodiment), a bidirectional DC / DC converter 704B connected to the inverter 702B, and a battery pack 706B connected to the bidirectional DC / DC converter 704B. Among them, the inverter 702B is also connected to the drive motor M of the vehicle to provide AC electric energy to the drive motor M.

[0069] As Figure 5B shown, the inverter 702B includes a second inductance coil 7022B and a three-phase bridge arm drive circuit 7024B.

[0070] The second inductance coil 7022B is arranged adjacent to the first inductance coil 6044B. One end of it is connected to the positive output end of the bidirectional DC / DC converter 704B, and the other end is connected to the positive input end of the three-phase bridge arm drive circuit 7024B.

[0071] The negative input end of the three-phase bridge arm drive circuit 7024B is connected to the negative output end of the bidirectional DC / DC converter 704B, and its output end (its AC midpoint) is connected to the drive motor M of the vehicle to provide AC electric energy to the drive motor M.

[0072] As Figure 5C shown, the power factor correction circuit 602B in the off-vehicle charger 600B includes diodes D1 - D5, an inductor L1, a capacitor C3, and a power switch tube 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 extreme of the AC power grid 400 is connected to the anode of diode D1 and the cathode of diode D3, and the negative extreme is connected to the anode of diode D2 and the cathode of diode D4. 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 tube S1 is connected between the anodes of diodes D3 and D4 and the anode of diode D5.

[0073] The conversion circuit 604B includes a DC / AC converter 6042B and a first inductor coil 6044B. The DC / AC converter 6042B includes four power switch tubes S2 - S5 that form a double-bridge-arm bridge circuit. Its positive input terminal (the drains of power switch tubes S2 and S3) is connected to the cathode of diode D5, and its negative input terminal (the sources of power switch tubes S4 and S5) is connected to the anodes of diodes D3 and D4. The midpoint of the first bridge arm formed by power switch tubes S2 and S4 is connected to one end of the first inductor coil 6044B, and the midpoint of the second bridge arm formed by power switch tubes S3 and S5 is connected to the other end of the first inductor coil 6044B.

[0074] The inverter 702B includes a second inductor coil 7022B and a three-phase bridge-arm drive circuit 7024B. The three-phase bridge-arm drive circuit 7024B includes six power switch tubes S8 - S13 and six diodes D8 - D13 that form a three-phase bridge arm. Its positive input terminal (the drains of power switch tubes S8, S9, and S10) is connected to one end of the second inductor coil 7022B, and its negative input terminal (the cathodes of diodes D9, D11, and D13) is connected to the negative output terminal of the bidirectional DC / DC converter 704B. The output terminal (AC midpoint) is connected to the drive motor M of the vehicle to supply AC electrical energy to the drive motor M.

[0075] The bidirectional DC / DC converter 704B includes two power switch tubes S6 - S7 and two diodes D6 - D7. Among them, the cathode of diode D6 and the drain of power switch tube S6 are connected to the positive extreme of the battery pack 706B. The anode of diode D6 is connected to the drain of power switch tube S7 and is connected to the negative input terminal of the three-phase bridge-arm drive circuit 7024B. The anode of diode D7 and the source of power switch tube S7 are connected to the negative extreme of the battery pack 706B. The cathode of diode D7 is connected to the source of power switch tube S6 and is connected to the other end of the second inductor coil 7022B.

[0076] A capacitor C1 is provided between the positive and negative extreme ends of the battery pack 706B.

[0077] It should be noted in particular that the first inductor coil 6044B serves as a transmitter, and the second inductor coil 7022B serves as a receiver. The electrical energy from the AC power grid 400 is transmitted to the vehicle-mounted device 700B through electromagnetic coupling between the two. In other words, the first inductor coil 6044B serves as the primary, and the second inductor coil 7022B serves as the secondary, and the two form an air-coreless air transformer.

[0078] When the wireless vehicle charger 500B according to an embodiment of the present invention operates in the charging mode of the vehicle, the PFC circuit 602B and the conversion circuit 604B in the off-vehicle charger 600B, and the inverter 702B and the bidirectional DC / DC converter 704B in the vehicle device 700B are all in the working state. Among them, at least one of the three bridge arms of the three-phase bridge arm drive circuit 7024B in the inverter 702B is turned on. The electric energy output by the AC power grid 400 sequentially passes through the PFC circuit 602B, the DC / AC converter 6042B, the first inductance coil 6044B in the off-vehicle charger 600B, the second inductance coil 7022B, the three-phase bridge arm drive circuit 7024B, and the bidirectional DC / DC converter 704B in the vehicle device 700B to charge the battery pack 706B.

[0079] When the wireless vehicle charger 500B according to an embodiment of the present invention operates in the driving mode of the vehicle, the off-vehicle charger 600B is separated from the vehicle device 700B. Therefore, the PFC circuit 602B and the conversion circuit 604B in the off-vehicle charger 600B are in the non-working state. The inverter 702B and the bidirectional DC / DC converter 704B in the vehicle device 700B are both in the working state. The electric energy output by the battery pack 706B sequentially passes through the bidirectional DC / DC converter 704B and the inverter 702B in the vehicle device 700B and is output to the drive motor M of the vehicle.

[0080] Compared with the prior art, the wireless vehicle charger 500B of the present invention achieves the following beneficial technical effects: The receiving circuit (including the coil as the receiver, the input rectifier, and the input filter) in the vehicle device is eliminated. The inductance coil in the conversion circuit of the off-vehicle charger is used as the transmitter (the primary of the air transformer), and the inductance coil in the inverter of the vehicle device is reused as the receiver (the secondary of the air transformer). The transmission of electric energy is realized through the electromagnetic coupling between the transmitter and the receiver, which greatly simplifies the structure of the vehicle charger, reduces the volume of the vehicle device, and reduces the cost of the vehicle charger and the vehicle device.

[0081] Based on different specific application scenarios, the bidirectional DC / DC converters 706A / 704B and the current source inverters 704A / 702B in the vehicle chargers 500A / 500B of the present invention can be arranged outside or in the drive motor M of the vehicle.

[0082] The wired vehicle charger of the present invention can be used for two-wheel vehicles or four-wheel vehicles.

[0083] It can be understood that the above specific embodiments are only for explaining the principle of the present invention

[0084] The exemplary embodiments adopted do not constitute a limitation on the protection scope of the present invention. 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 invention shall be included within the protection scope of the present invention.

Claims

1. An in-vehicle device (700A, 700B) for a vehicle charging device (500A, 500B), characterized in that, the in-vehicle device (700A, 700B) includes: an inverter (704A, 702B) which includes a first inductance coil (7042A, 7022B) and is connected to a drive motor of the vehicle, wherein, in a charging mode of the vehicle, the first inductance coil (7042A, 7022B) serves as a secondary of a transformer; a bidirectional DC / DC converter (706A, 704B) which is connected to the inverter (704A, 702B); and a battery pack (708A, 706B) which is connected to the bidirectional DC / DC converter (706A, 704B).

2. The in-vehicle device according to claim 1, characterized in that, the inverter (704A, 702B) further includes a three-phase bridge arm drive circuit (7044A, 7024B), wherein one end of the first inductance coil (7042A, 7022B) is connected to a positive output end of the bidirectional DC / DC converter (706A, 704B), the other end is connected to a positive input end of the three-phase bridge arm drive circuit (7044A, 7024B), a negative input end of the three-phase bridge arm drive circuit (7044A, 7024B) is connected to a negative output end of the bidirectional DC / DC converter (706A, 704B), and its output end is connected to the drive motor of the vehicle to provide AC electric energy to the drive motor.

3. The in-vehicle device according to claim 1, characterized in that, the inverter (704A, 702B) is a current source inverter.

4. The in-vehicle device according to any one of claims 1-3, characterized in that, the in-vehicle device (700A) further includes a conversion circuit (702A), and the conversion circuit (702A) includes: a DC / AC converter (7022A) which is connected to a non-vehicle charger (600A) in the vehicle charging device (500A, 500B); and a second inductance coil (7024A) which is connected to the DC / AC converter (7022A), wherein the second inductance coil (7024A) serves as a primary, the first inductance coil (7042A) serves as a secondary, and the two together form the transformer.

5. The in-vehicle device according to any one of claims 1-3, characterized in that, the vehicle charging device (500A, 500B) includes a non-vehicle charger (600A, 600B) connected to an AC power grid (400), in a charging mode of the vehicle, the bidirectional DC / DC converter (706A, 704B) transmits electric energy from the AC power grid (400) to the battery pack (708A, 706B), and in a driving mode of the vehicle, the bidirectional DC / DC converter (706A, 704B) transmits electric energy from the battery pack (708A, 706B) to the drive motor of the vehicle.

6. The vehicle-mounted device according to any one of claims 1-3, characterized in that, the bidirectional DC / DC converters (706A, 704B) and the inverters (704A, 702B) are provided in the drive motor of the vehicle.

7. A vehicle charging device (500A, 500B), characterized in that, the vehicle charging device (500A, 500B) comprises: the vehicle-mounted device (700A, 700B) according to any one of claims 1-6; and a non-vehicle-mounted charger (600A, 600B) connected to the AC power grid (400) and the vehicle-mounted device (700A, 700B).

8. The vehicle charging device according to claim 7, characterized in that, the non-vehicle-mounted charger (600A, 600B) includes a power factor correction circuit (602A, 602B) connected to the AC power grid (400).

9. The vehicle charging device according to claim 8, characterized in that, the vehicle charging device (500A, 500B) further includes a conversion circuit (702A, 604B), the conversion circuit (702A, 604B) is provided in the non-vehicle-mounted charger (600B) or the vehicle-mounted device (700A), and includes: a DC / AC converter (7022A, 6042B) connected to the power factor correction circuit (602A, 602B) in the non-vehicle-mounted charger (600A, 600B); and a second inductance coil (7024A, 6044B) connected to the DC / AC converter (7022A, 6042B), wherein, the second inductance coil (7024A, 6044B) is used as the primary, and the first inductance coil (7042A, 7022B) in the vehicle-mounted device (700A, 700B) is used as the secondary, and the two together form a transformer.

10. The vehicle charging device according to claim 9, characterized in that, the vehicle charging device (500B) is a wireless vehicle charging device, the conversion circuit (604B) is provided in the non-vehicle-mounted charger (600B), the second inductance coil (6044B) is used as a transmitter, and the first inductance coil (7022B) in the vehicle-mounted device (700B) is used as a receiver, and the two together form an air-coreless air transformer.

11. The vehicle charging device according to claim 10, characterized in that, In the charging mode of the vehicle, the second inductive coil (6044B) in the off-vehicle charger (600B) is disposed adjacent to the first inductive coil (7022B) in the vehicle-mounted device (700B), and power is transmitted through electromagnetic coupling. The electric energy output from the AC power grid (400) sequentially passes through the power factor correction circuit (602B) in the off-vehicle charger (600B), the DC / AC converter (6042B) in the conversion circuit (604B), the air-core transformer formed by the second inductive coil (6044B) and the first inductive coil (7022B), the inverter (702B), and the bidirectional DC / DC converter (704B) to charge the battery pack (706B), and In the driving mode of the vehicle, the electric energy output from the battery pack (706B) sequentially passes through the bidirectional DC / DC converter (704B) and the inverter (702B) in the vehicle-mounted device (700B), and is output to the driving motor of the vehicle.

12. The vehicle charging device according to claim 9, characterized in that the vehicle charging device (500A) is a wired vehicle charging device, the conversion circuit (702A) is disposed in the vehicle-mounted device (700A), the second inductive coil (7024A) is used as the primary, and the first inductive coil (7042A) is used as the secondary, and the two together form a transformer with a common magnetic core.

13. The vehicle charging device according to claim 12, characterized in that in the charging mode of the vehicle, the off-vehicle charger (600A) is connected to the vehicle-mounted device (700A), and the electric energy output from the AC power grid (400) sequentially passes through the power factor correction circuit (602A) in the off-vehicle charger (600A), the DC / AC converter (7022A) in the conversion circuit (702A) in the vehicle-mounted device (700A), the transformer formed by the second inductive coil (7024A) and the first inductive coil (7042A), the inverter (704A), and the bidirectional DC / DC converter (706A) to charge the battery pack (708A), and in the driving mode of the vehicle, the off-vehicle charger (600A) is separated from the vehicle-mounted device (700A), and the electric energy output from the battery pack (708A) sequentially passes through the bidirectional DC / DC converter (706A) and the inverter (704A) in the vehicle-mounted device (700A), and is output to the driving motor of the vehicle.

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