阅读说明：本技术 一种电机驱动系统及车辆 (Motor drive system and vehicle ) 是由 陈金华 殷孝德 王少华 程洋 毋超强 于 2020-05-21 设计创作，主要内容包括：本申请提供一种电机驱动系统和车辆,涉及车辆控制技术领域,能够简化电机驱动系统的结构、降低成本。电机驱动系统包括：双向充电机、励磁驱动组件和电机控制器,双向充电机包括：功率因数校正电路、第一电压变换电路、第一变压器和第二电压变换电路；蓄电单元电连接于第二电压变换电路的第二端口；励磁驱动组件通过第一开关单元电连接于复用节点,复用节点位于功率因数校正电路和第一电压变换电路之间,励磁驱动组件用于驱动励磁电机。(The application provides a motor drive system and vehicle relates to vehicle control technical field, can simplify motor drive system's structure, reduce cost. The motor drive system includes: two-way machine that charges, excitation drive assembly and machine controller, two-way machine that charges includes: the power factor correction circuit, the first voltage conversion circuit, the first transformer and the second voltage conversion circuit; the electric storage unit is electrically connected to a second port of the second voltage conversion circuit; the excitation driving assembly is electrically connected to a multiplexing node through a first switch unit, the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit, and the excitation driving assembly is used for driving an excitation motor.)

1. A motor drive system, comprising:

two-way charger, wherein, two-way charger includes:

the first port of the power factor correction circuit is used for being electrically connected with the charging port;

a first voltage conversion circuit, a first port of which is electrically connected to a second port of the power factor correction circuit, the first port of which is used for inputting or outputting direct current, and the second port of which is used for inputting or outputting alternating current;

a first transformer, a first port of which is electrically connected to a second port of the first voltage conversion circuit;

a second voltage conversion circuit, a first port of which is electrically connected to the second port of the first transformer, the first port of which is used for inputting or outputting alternating current, a second port of which is used for outputting or inputting direct current, and a second port of which is used for electrically connecting an electric storage unit;

the motor drive system further includes:

the excitation driving assembly is electrically connected to a multiplexing node through a first switch unit, the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit, and the excitation driving assembly is used for driving an excitation motor.

2. Motor drive system according to claim 1,

the excitation driving assembly comprises a carbon brush or a slip ring, the input end of the carbon brush or the slip ring is electrically connected to the multiplexing node through the first switch unit, and the output end of the carbon brush or the slip ring is used for driving the excitation motor.

3. The motor drive system according to claim 1 or 2, further comprising:

the second switch unit is positioned between the power factor correction circuit and the first voltage conversion circuit, and the multiplexing node is electrically connected to a second port of the power factor correction circuit through the second switch unit.

4. A motor drive system, comprising:

two-way charger, wherein, two-way charger includes:

the first port of the power factor correction circuit is used for being electrically connected with the charging port;

a first voltage conversion circuit, a first port of which is electrically connected to a second port of the power factor correction circuit, the first port of which is used for inputting or outputting direct current, and the second port of which is used for inputting or outputting alternating current;

a first transformer, a first port of which is electrically connected to a second port of the first voltage conversion circuit;

a second voltage conversion circuit, a first port of which is electrically connected to the second port of the first transformer, the first port of which is used for inputting or outputting alternating current, a second port of which is used for outputting or inputting direct current, and a second port of which is used for electrically connecting an electric storage unit;

the motor drive system further includes:

the excitation driving assembly is electrically connected to a multiplexing node through a first switch unit, the multiplexing node is located between the first voltage conversion circuit and the second voltage conversion circuit, and the excitation driving assembly is used for driving an excitation motor.

5. Motor drive system according to claim 4,

the excitation drive assembly includes:

the primary side of the wireless power transmission transformer is electrically connected to the multiplexing node through the first switch unit, and the secondary side of the wireless power transmission transformer is used for receiving electric energy transmitted by the primary side;

and the input end of the excitation rectifying circuit is electrically connected to the secondary side of the wireless power transmission transformer, and the output end of the excitation rectifying circuit is used for driving the excitation motor.

6. Motor drive system according to claim 4 or 5,

the multiplexing node is located between the first transformer and the second voltage conversion circuit.

7. The motor drive system of claim 6, further comprising:

and the second switch unit is positioned between the power factor correction circuit and the second voltage conversion circuit, and the multiplexing node is electrically connected to the second port of the first transformer through the second switch unit.

8. The motor drive system of claim 7, further comprising:

a first resonance unit electrically connected between the multiplexing node and the second voltage conversion circuit.

9. A motor drive system according to any one of claims 1-8, further comprising:

a motor controller for controlling the excitation motor;

the charging controller is used for controlling the bidirectional charger, the charging controller is in communication connection with the motor controller, and the charging controller is also used for controlling the first switch unit to be switched off when the bidirectional charger is in a bidirectional charging mode, and controlling the first switch unit to be switched on when an automobile starting signal is received.

10. A motor drive system as claimed in any one of claims 3, 7 and 8, further comprising:

a motor controller for controlling the excitation motor;

the charging controller is used for controlling the bidirectional charger, the charging controller is in communication connection with the motor controller, and the charging controller is also used for controlling the first switch unit to be switched off and the second switch unit to be switched on when the bidirectional charger is in a bidirectional charging mode, and controlling the first switch unit to be switched on and the second switch unit to be switched off when an automobile starting signal is received.

11. The motor drive system according to claim 7 or 8, further comprising:

a motor controller for controlling the excitation motor;

the charging controller is used for controlling the bidirectional charger, is in communication connection with the motor controller, and is also used for controlling the first switch unit to be switched off and the second switch unit to be switched on when the bidirectional charger is in a bidirectional charging mode, and controlling the first switch unit to be switched on and the second switch unit to be switched off when an automobile starting signal is received;

the excitation drive assembly includes:

the primary side of the wireless power transmission transformer is electrically connected to the multiplexing node through the first switch unit, and the secondary side of the wireless power transmission transformer is used for receiving electric energy transmitted by the primary side;

the input end of the excitation rectifying circuit is electrically connected to the secondary side of the wireless power transmission transformer, and the output end of the excitation rectifying circuit is used for being electrically connected with the excitation motor;

the charging controller is also used for receiving the electric energy transmitted by the primary side of the wireless power transmission transformer.

12. A motor drive system according to any one of claims 1 to 11,

the power factor correction circuit is a two-phase alternating current power factor correction circuit or a three-phase alternating current power factor correction circuit.

13. A vehicle comprising an excited electric machine, and an electric machine drive system according to any one of claims 1 to 12.

Technical Field

The present application relates to the field of vehicle control, and in particular, to a motor drive system and a vehicle.

Background

The motor system is a core component of a new energy automobile, and the development trend of the motor system in the future is high efficiency, low cost and small volume. The excitation motor has the characteristics of no use or little use of permanent magnets, adjustable excitation, wide speed regulation range and the like, when the excitation motor is used in a motor system, the excitation motor is driven by adopting a carbon brush structure or a wireless transformer and other driving components, in addition, a voltage conversion circuit and a corresponding driving control circuit are additionally arranged between the electric storage unit and the driving components, and the existing motor driving system has a complex structure and higher cost.

Disclosure of Invention

The technical scheme of this application provides a motor drive system and vehicle, can simplify motor drive system's structure, reduce cost.

In a first aspect, the present technical solution provides a motor driving system, including: two-way charger, wherein, two-way charger includes: the first port of the power factor correction circuit is electrically connected with the charging port; a first port of the first voltage conversion circuit is electrically connected with a second port of the power factor correction circuit, the first port of the first voltage conversion circuit is used for inputting or outputting direct current, and the second port of the first voltage conversion circuit is used for inputting or outputting alternating current; a first transformer, a first port of which is electrically connected to a second port of the first voltage conversion circuit; a first port of the second voltage conversion circuit is electrically connected to the second port of the first transformer, the first port of the second voltage conversion circuit is used for inputting or outputting alternating current, the second port of the second voltage conversion circuit is used for outputting or inputting direct current, and the second end of the second voltage conversion circuit is used for electrically connecting the electric storage unit; the motor drive system further includes: the excitation driving assembly is electrically connected to the multiplexing node through the first switch unit, the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit, and the excitation driving assembly is used for driving the excitation motor.

Optionally, the excitation driving assembly includes a carbon brush or a slip ring, an input end of the carbon brush or the slip ring is electrically connected to the multiplexing node through the first switch unit, and an output end of the carbon brush or the slip ring is used for transmitting electric energy to the excitation motor.

Optionally, the motor drive system further comprises: and the second switch unit is arranged between the power factor correction circuit and the first voltage conversion circuit, and the multiplexing node is electrically connected to the second port of the power factor correction circuit through the second switch unit.

In a second aspect, the present technical solution further provides a motor driving system, including: two-way charger, wherein, two-way charger includes: the first port of the power factor correction circuit is electrically connected with the charging port; a first port of the first voltage conversion circuit is electrically connected with a second port of the power factor correction circuit, the first port of the first voltage conversion circuit is used for inputting or outputting direct current, and the second port of the first voltage conversion circuit is used for inputting or outputting alternating current; a first transformer, a first port of which is electrically connected to a second port of the first voltage conversion circuit; a first port of the second voltage conversion circuit is electrically connected to the second port of the first transformer, the first port of the second voltage conversion circuit is used for inputting or outputting alternating current, the second port of the second voltage conversion circuit is used for outputting or inputting direct current, and the second end of the second voltage conversion circuit is used for electrically connecting the electric storage unit; the motor drive system further includes: the excitation driving assembly is electrically connected to the multiplexing node through the first switch unit, the multiplexing node is located between the first voltage conversion circuit and the second voltage conversion circuit, and the excitation driving assembly is used for driving the excitation motor.

Optionally, the excitation drive assembly comprises: the primary side of the wireless power transmission transformer is electrically connected to the multiplexing node through the first switch unit, and the secondary side of the wireless power transmission transformer is used for receiving electric energy transmitted by the primary side of the wireless power transmission transformer; and the input end of the excitation rectifying circuit is electrically connected to the secondary side of the wireless power transmission transformer, and the output end of the excitation rectifying circuit is electrically connected with an excitation motor.

Optionally, the multiplexing node is located between the first transformer and the second voltage conversion circuit.

Optionally, the motor drive system further comprises: and the second switch unit is arranged between the power factor correction circuit and the second voltage conversion circuit, and the multiplexing node is electrically connected to the second port of the first transformer through the second switch unit.

Optionally, the motor drive system further comprises: and the first resonance unit is electrically connected between the multiplexing node and the second voltage conversion circuit.

Optionally, the motor drive system further comprises: a motor controller for controlling the excitation motor; the charging controller is used for controlling the bidirectional charger, the charging controller is in communication connection with the motor controller, and the charging controller is also used for controlling the first switch unit to be switched off when the bidirectional charger is in a bidirectional charging mode, and controlling the first switch unit to be switched on when the charging controller receives an automobile starting signal.

Optionally, the motor drive system further comprises: a motor controller for controlling the excitation motor; the charging controller is used for controlling the bidirectional charger, the charging controller is in communication connection with the motor controller, the charging controller is also used for controlling the first switch unit to be switched off and the second switch unit to be switched on when the bidirectional charger is in a bidirectional charging mode, and the charging controller is used for controlling the first switch unit to be switched on and the second switch unit to be switched off when the charging controller receives an automobile starting signal.

Optionally, the motor drive system further comprises: a motor controller for controlling the excitation motor; the charging controller is used for controlling the bidirectional charger, is in communication connection with the motor controller, and is also used for controlling the first switch unit to be switched off and the second switch unit to be switched on when the bidirectional charger is in a bidirectional charging mode, and controlling the first switch unit to be switched on and the second switch unit to be switched off when the charging controller receives an automobile starting signal; the excitation drive assembly includes: the primary side of the wireless power transmission transformer is electrically connected to the multiplexing node through the first switch unit, and the secondary side of the wireless power transmission transformer is used for receiving electric energy transmitted by the primary side of the wireless power transmission transformer; the input end of the excitation rectifying circuit is electrically connected to the secondary side of the wireless power transmission transformer, and the output end of the excitation rectifying circuit is electrically connected with an excitation motor; the charging controller is also used for receiving the electric energy transmitted by the primary side of the wireless power transmission transformer.

Optionally, the power factor correction circuit is a two-phase alternating current power factor correction circuit or a three-phase alternating current power factor correction circuit.

In a third aspect, the present disclosure provides a vehicle, including an excitation motor and the motor drive system.

According to the motor driving system and the vehicle in the embodiment of the application, the reset node is connected through the first switch, the reset node is located between the second voltage conversion circuit and the charging port in the bidirectional charger, namely, a part of circuit structures required by the excitation motor can be multiplexed through a part of circuits at least comprising the second voltage conversion circuit in the bidirectional charger, and a part of circuits in the bidirectional charger are utilized in a time-division multiplexing integration mode, so that the structure of the circuits in the motor driving system is simplified, the cost is reduced, the weight and the volume of the motor driving system are reduced, the heat energy loss is reduced, and the cruising ability of the vehicle can be effectively increased.

Drawings

FIG. 1 is a schematic circuit diagram of a motor drive system;

FIG. 2 is a schematic diagram of an alternative motor drive system circuit configuration;

FIG. 3 is a schematic diagram of a charging portion of a motor drive system;

FIG. 4 is a block diagram of a motor driving system according to an embodiment of the present disclosure;

FIG. 5 is a block diagram of another exemplary motor drive system according to the present disclosure;

FIG. 6 is a block diagram of another motor drive system according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a corresponding circuit configuration of the motor driving system of FIG. 6;

FIG. 8 is a schematic diagram of a corresponding circuit configuration of the motor driving system of FIG. 5;

FIG. 9 is a schematic diagram of another corresponding circuit configuration of the motor driving system of FIG. 5;

fig. 10 is a schematic diagram of another circuit structure corresponding to the motor driving system in fig. 6.

Detailed Description

The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.

Before describing the embodiments of the present application, a brief description will be given to the discovery process of the embodiments of the present application.

As shown in fig. 1, fig. 1 is a schematic diagram of a circuit structure of a driving part of a motor driving system, where the structure shown in fig. 1 includes an excitation driving circuit, a rotary connector, an electrical storage unit, an excitation control unit and a motor controller, where the excitation driving circuit includes a DC-DC conversion circuit, the electrical energy of the electrical storage unit is converted into an adjustable direct current by using the excitation driving circuit, the direct current generated by the excitation driving circuit is transmitted to an excitation motor rotor through a rotary connector structure such as a carbon brush or a slip ring, so as to implement electrical excitation, and the excitation control unit includes an excitation power tube driving circuit, a sampling circuit, an excitation driving chip, and the like. The rotor and the excitation driving circuit are connected by using rotating connectors such as carbon brush slip rings and the like, the structure is simple, the size can be properly reduced, but the service life of the carbon brush slip rings and the like is very limited, the performances such as electrical noise, wear rate, contact resistance and the like are not ideal, and the reliability can be greatly reduced. Therefore, the motor driving system using the carbon brush type excitation system sacrifices reliability for a simple structure and a small volume, and also increases cost.

As shown in fig. 2, fig. 2 is a schematic view of a driving part of another motor driving system, and the structure shown in fig. 2 includes an excitation driving circuit, a wireless transmission transformer, a rectifying circuit, an electric storage unit, an excitation control unit and a motor controller, the main difference between the structure shown in fig. 2 and the structure shown in fig. 1 is that the excitation driving circuit includes a DC-AC conversion circuit for converting the electric energy of the storage unit into high-frequency alternating current to be transmitted to the primary side of the wireless transmission transformer, the secondary side of the wireless transmission transformer is installed on the rotor of the excitation driving motor, the primary side and the secondary side of the wireless transmission transformer are not in contact with each other, the electric energy is transmitted in a wireless transmission mode, the motor rotor is also provided with a rectifying circuit which converts alternating current received by the secondary side of the wireless transmission transformer into direct current, and the excitation control unit comprises an excitation power tube driving circuit, a sampling circuit, an excitation driving chip and the like. The wireless transmission mode is adopted, so that the reliability of exciting current transmission is improved, and meanwhile, the cost of a wireless transmission transformer and the cost of a rectifying circuit are also increased.

As shown in fig. 3, fig. 3 is a schematic diagram of a charging part of a motor driving system, the structure shown in fig. 3 includes a bidirectional charger, an electric storage unit, and a charging control circuit, the bidirectional charger includes a Power factor correction (Power factor correction, PFC) circuit, a first full-bridge voltage conversion circuit, a resonant voltage conversion circuit, and a second full-bridge voltage conversion circuit, and the charging control circuit is used for controlling devices in the bidirectional charger. The bidirectional charger is used for realizing bidirectional charging between a power grid and the power storage unit, namely charging from the power grid to the power storage unit and charging from the power storage unit to the power grid. The bidirectional Charger is an On-board Charger (OBC).

In an embodiment of the invention, the driving part for driving the motor is a DC-DC conversion circuit or a DC-AC conversion circuit, and the second full-bridge conversion circuit in the bidirectional charger can convert the DC power output by the electric storage unit into AC power, i.e. the DC-AC conversion function is realized, and the part consisting of the first full-bridge voltage conversion circuit, the resonant voltage conversion circuit and the second full-bridge voltage conversion circuit can convert the DC power output by the electric storage unit into DC power, i.e. the DC-DC conversion function is realized, so that the voltage conversion function required for charging can be realized in the bidirectional charging process by using part of the circuits in the bidirectional charger in a time-division multiplexing manner, and the voltage conversion function required for driving is realized in the motor driving process, thus, no additional excitation driving circuit is required to be separately arranged, so as to simplify the structure of the motor driving system, The cost is reduced. The motor drive system and the vehicle in the embodiment of the present application are explained below with specific embodiments.

As shown in fig. 4, fig. 4 is a block diagram of a motor driving system in an embodiment of the present application, and the embodiment of the present application provides a motor driving system, including: the bidirectional charger 1, the excitation driving assembly 6 and the motor controller 20, and in addition, fig. 4 also illustrates an excitation motor 7 which needs to be driven by the motor driving system, and an electric storage unit 5 for providing electric energy in the driving process. The bidirectional charger 1 includes: a power factor correction circuit 11, a first port of which is electrically connected to the charging port 2; a first voltage conversion circuit 31, a first port of which is electrically connected to the second port of the power factor correction circuit 11, the first port of the first voltage conversion circuit 31 being used for inputting or outputting dc power, and the second port of the first voltage conversion circuit 31 being used for inputting or outputting ac power, that is, the first voltage conversion circuit 31 is used for converting the dc power at the first port thereof into ac power at the second port thereof or converting the ac power at the second port thereof into dc power at the first port thereof; a first transformer 41 having a first port electrically connected to the second port of the first voltage conversion circuit 31, the first transformer 41 converting the voltage of the alternating current; a second voltage conversion circuit 32, a first port of which is electrically connected to the second port of the first transformer 41, a first port of the second voltage conversion circuit 32 is used for inputting or outputting alternating current, a second port of the second voltage conversion circuit 32 is used for inputting or outputting direct current, that is, the second voltage conversion circuit is used for converting alternating current at the first port thereof into direct current at the second port thereof or converting direct current at the second port thereof into alternating current at the first port thereof, and a second port of the second voltage conversion circuit 32 is used for electrically connecting the electric storage unit 5; the excitation driving assembly 6 is electrically connected to a multiplexing node a through a first switch unit 81, the multiplexing node a is located between the charging port 2 and the second voltage conversion circuit 32 in the bidirectional charger 1, the excitation driving assembly 6 is used for driving the excitation motor 7, and the motor controller 20 is used for controlling the excitation motor 7.

Specifically, in the configuration shown in fig. 4, the first port of each circuit or device is referred to as its left port, and the second port of each circuit or device is referred to as its right port. The above-mentioned motor drive system has two operation modes including a bidirectional charging mode and a motor drive mode, when the motor drive system operates in the bidirectional charging mode, the first switch unit 81 is turned off, that is, between the multiplexing node and the excitation motor 7 is turned off, the bidirectional charging mode includes a first charging mode and a second charging mode, the first charging mode is a mode in which the electric storage unit 5 is charged by the charging port 2 (the charging port 2 can be connected to the grid), the second charging mode is a mode in which the electric storage unit 5 is charged to the charging port 2 (the charging port 2 can be connected to the grid), that is, the bidirectional charging is realized by the bidirectional charger, in the first charging mode, the alternating current from the charging port 2 is converted into direct current after passing through the power factor correction circuit 11, and the direct current is converted into alternating current after passing through the first voltage conversion circuit 31, the alternating current changes voltage after passing through the first transformer 41, and the alternating current with changed voltage is converted into direct current for charging the electric storage unit 5 after passing through the second voltage conversion circuit 32; in the second charging mode, the direct current from the electric storage unit 5 is converted into alternating current after passing through the second voltage conversion circuit 32, the alternating current changes the voltage after passing through the first transformer 42, the alternating current with the changed voltage is converted into direct current after passing through the first voltage conversion circuit 31, the direct current is converted into alternating current after passing through the power factor correction circuit 11, and the alternating current charges the grid through the charging port 2. In the bidirectional charging mode, the field motor 7 is not driven to operate. In the motor driving mode, the first switching unit 81 is turned on, that is, the multiplexing node is turned on with the exciting motor 7, and taking the multiplexing node a located between the power factor correction circuit 11 and the first voltage conversion circuit 31 as an example, in this mode, the dc power output by the electric storage unit 5 is converted into ac power by the second voltage conversion circuit 32, the ac power changes voltage by the first transformer 42, the ac power with changed voltage is converted into dc power by the first voltage conversion circuit 31, and the dc power forms exciting current to drive the exciting motor 7 by the exciting drive component 6. That is, in the configuration shown in fig. 4, the parts of the first voltage conversion circuit 31, the first transformer 41, and the second voltage conversion circuit 32 are time-division multiplexed between the bidirectional charging mode and the motor driving mode, and are respectively used for realizing different voltage conversion functions, and the control of the time-division multiplexing is realized by the first switching unit 81.

It should be noted that fig. 4 only illustrates the structure when the multiplexing node a is located between the power factor correction circuit 11 and the first voltage conversion circuit 31, in other realizable embodiments, the multiplexing node a may also be located at other positions as long as it is located on the path between the charging port 2 and the second voltage conversion circuit 32 in the bidirectional charger 1, for example, it may also be located between the charging port 2 and the power factor correction circuit 11, between the first voltage conversion circuit 31 and the first transformer 41, or between the first transformer 41 and the second voltage conversion circuit 32. The specific setting can be according to needs.

The motor driving system in the embodiment of the application is connected with the reset node through the first switch, the reset node is located between the second voltage conversion circuit and the charging port in the bidirectional charger, namely, a part of circuits at least comprising the second voltage conversion circuit in the bidirectional charger can be multiplexed to be a part of circuit structures required by the excitation motor, and a part of circuits in the bidirectional charger are utilized in a time-sharing multiplexing integration mode, so that the structure of the circuits in the motor driving system is simplified, the cost is reduced, the weight and the volume of the motor driving system are reduced, the heat generation is reduced, and the increase of the driving mileage of a vehicle is facilitated.

Alternatively, as shown in fig. 4, the multiplexing node a is located on the path between the power factor correction circuit 11 and the first voltage conversion circuit 31. Between the charging port 2 and the second voltage conversion circuit 32, the electric energy output from the electric storage unit 5 is converted into direct current only when it reaches the path between the power factor correction circuit 11 and the first voltage conversion circuit 31, and therefore, for the excitation drive assembly 6 that needs to use direct current as an input, it is necessary to provide the multiplexing node a on the path between the power factor correction circuit 11 and the first voltage conversion circuit 31.

Alternatively, as shown in fig. 4, the excitation drive assembly 6 includes a carbon brush or a slip ring, the carbon brush or the slip ring is electrically connected between the first switch unit 81 and the excitation motor 7, an input end of the carbon brush or the slip ring is electrically connected to the multiplexing node a through the first switch unit 81, and an output end of the carbon brush or the slip ring is used for transmitting electric energy to the excitation motor 7, so as to drive the excitation motor 7. The input power required for a rotary connector configuration such as a carbon brush or a slip ring is direct current, and therefore, a multiplexing node a is provided in the path between the power factor correction circuit 11 and the first voltage conversion circuit 31.

Alternatively, as shown in fig. 5, fig. 5 is a block diagram of another structure of the motor driving system in the embodiment of the present application, and the structure shown in fig. 5 and fig. 4 is different in that the motor driving system further includes a second switching unit 82, which is disposed between the power factor correction circuit 11 and the first voltage conversion circuit 31, and the multiplexing node a is electrically connected to the second port of the power factor correction circuit 11 through the second switching unit 82. When the motor drive system operates in the bidirectional charging mode, the second switch unit 82 is turned on to turn on the power factor correction circuit 11 and the first voltage conversion circuit 31, and when the motor drive system operates in the motor system mode, the second switch unit 82 is turned off to turn off the power factor correction circuit 11 and the first voltage conversion circuit 31, so as to avoid adverse effects of the power factor correction circuit 11 on the driving process of the exciting motor 7.

Optionally, as shown in fig. 6, fig. 6 is a block diagram of another structure of a motor driving system in an embodiment of the present application, and an embodiment of the present application further provides a motor driving system, including: the device comprises a bidirectional charger 1, an excitation driving assembly 6 and a motor controller 20. The bidirectional charger 1 includes: a power factor correction circuit 11, a first port of which is electrically connected to the charging port 2; a first voltage conversion circuit 31, a first port of which is electrically connected to the second port of the power factor correction circuit 11, the first port of the first voltage conversion circuit 31 being used for inputting or outputting dc power, and the second port of the first voltage conversion circuit 31 being used for inputting or outputting ac power, that is, the first voltage conversion circuit 31 is used for converting the dc power at the first port thereof into ac power at the second port thereof or converting the ac power at the second port thereof into dc power at the first port thereof; a first transformer 41 having a first port electrically connected to the second port of the first voltage conversion circuit 31, the first transformer 41 converting the voltage of the alternating current; a second voltage conversion circuit 32, a first port of which is electrically connected to the second port of the first transformer 41, a first port of the second voltage conversion circuit 32 is used for inputting or outputting alternating current, a second port of the second voltage conversion circuit 32 is used for inputting or outputting direct current, that is, the second voltage conversion circuit is used for converting alternating current at the first port thereof into direct current at the second port thereof or converting direct current at the second port thereof into alternating current at the first port thereof, and a second port of the second voltage conversion circuit 32 is used for electrically connecting the electric storage unit 5; the excitation driving assembly 6 is electrically connected to a multiplexing node a through a first switching unit 81, the multiplexing node a is located between the first voltage conversion circuit 31 and the second voltage conversion circuit 32, the excitation driving assembly 6 is configured to drive the excitation motor 7, and the motor controller 20 is configured to control the excitation motor 7.

Specifically, on the path between the charging port 2 and the second voltage conversion circuit 32, the electric energy output from the electric storage unit 5 is converted into alternating current when it reaches between the first voltage conversion circuit 31 and the second voltage conversion circuit 32, and therefore, for the excitation drive assembly 6 that needs to use alternating current as input, it is necessary to provide the multiplexing node a on the path between the first voltage conversion circuit 31 and the second voltage conversion circuit 32.

Alternatively, as shown in fig. 6, excitation drive assembly 6 includes: a primary side of the wireless power transmission transformer 61 is electrically connected to the multiplexing node a through a first switch unit 81, and a secondary side thereof is used for receiving electric energy transmitted by the primary side; and an excitation rectifying circuit 62 having an input end electrically connected to the secondary side of the wireless power transmission transformer 61 and an output end electrically connected to the excitation motor 7. The input power required by the configuration of the wireless power transmission transformer 61 is an alternating current, and thus the multiplexing node a is provided on the path between the first voltage conversion circuit 31 and the second voltage conversion circuit 32.

Alternatively, as shown in fig. 6, the multiplexing node a is located between the first transformer 41 and the second voltage conversion circuit 32. When the motor drive system operates in the motor system mode, although ac power can be generated in the path between the first voltage conversion circuit 31 and the second voltage conversion circuit 32, the less the devices involved in the connection to the excitation drive assembly 6, the less the loss of power, and therefore, by providing the multiplexing node a in the path between the first transformer 41 and the second voltage conversion circuit 32, the power loss in the motor system mode can be further reduced.

Optionally, as shown in fig. 6, the motor drive system further includes: and a second switching unit 82 provided on a path between the power factor correction circuit 11 and the second voltage conversion circuit 32, the multiplexing node a being electrically connected to the second port of the first transformer 41 through the second switching unit 82. When the motor driving system operates in the bidirectional charging mode, the second switching unit 82 is turned on to turn on the first transformer 41 and the second voltage conversion circuit 32, and when the motor driving system operates in the motor system mode, the second switching unit 82 is turned off to turn off the first transformer 41 and the second voltage conversion circuit 32, so as to avoid adverse effects of other devices on the left side of the second voltage conversion circuit 32 in the bidirectional charger 1 on the driving process of the excitation motor 7.

Optionally, as shown in fig. 7, fig. 7 is a schematic circuit structure diagram corresponding to the motor driving system in fig. 6, and the motor driving system further includes: and a first resonance unit 91, the first resonance unit 91 being electrically connected between the multiplexing node a and the second voltage conversion circuit 32. The first resonance unit 91 is used to implement a resonance function in both the motor driving mode and the bidirectional charging mode, i.e., the first resonance unit 91 is multiplexed at the same time.

Specifically, the first resonance unit 91 may include a first inductor L1 and a first capacitor C1, which are respectively connected in series to two branches, the motor driving system may further include a second resonance unit 92, the second resonance unit 92 is electrically connected to a path between the first voltage conversion circuit 31 and the first transformer 41, the second resonance unit 92 may include a second inductor L2 and a second capacitor C2, which are respectively connected in series to two branches, the first resonance unit 91, the first transformer 41, and the second resonance unit 92 may constitute a resonance voltage conversion circuit, in other embodiments, a multiplexing node a may be disposed on a path between the first resonance unit 91 and the second voltage conversion circuit 32, or on a path between the second resonance unit 92 and the first transformer 41, or on a path between the first voltage conversion circuit 31 and the second resonance unit 92, fig. 7 illustrates a specific configuration of the power factor correction circuit 11, the first voltage conversion circuit 31, the second voltage conversion circuit 32, and the excitation circuit 62, and the specific configuration of the first resonance voltage conversion circuit 31 and the second resonance circuit may be implemented as a full bridge circuit, and the above-specific configuration of the embodiments may be implemented only as long as the description that the structures of the power factor correction circuit 11, the embodiments are not limited by the present application.

Optionally, as shown in fig. 7, the motor drive system further includes: a motor controller 20 for controlling the excitation motor 7; the charging controller 30 is used for controlling the bidirectional charger 1, the charging controller 30 is in communication connection with the motor controller 20, and the charging controller 30 is further used for controlling the first switch unit 81 to be turned off when the bidirectional charger 1 is in a bidirectional charging mode, and controlling the first switch unit 81 to be turned on when the charging controller 30 receives an automobile starting signal. The charging controller 30 is configured to control the first switch unit 81 in addition to the bidirectional charger 1, for example, when a current is detected at the charging port 2, the bidirectional charger 1 is in a bidirectional charging mode, and at this time, the first switch unit 81 is controlled to be turned off to perform a bidirectional charging process; when the vehicle start signal is detected, the first switch unit 81 is controlled to be turned on to perform the motor driving process, and the two processes do not occur simultaneously. In addition, the communication connection between the charging controller 30 and the motor controller 20 is for implementing feedback control between the bidirectional charger 1 and the excitation motor 7 in the motor drive mode, and the communication connection between the charging controller 30 and the motor controller 20 includes wired and wireless communication connection modes.

Alternatively, as shown in fig. 7 and 8, fig. 8 is a schematic circuit structure diagram corresponding to the motor driving system in fig. 5, and the motor driving system further includes: a motor controller 20 for controlling the excitation motor 7; the charging controller 30 is used for controlling the charging controller 30 of the bidirectional charger 1, the charging controller 30 is in communication connection with the motor controller 20, and the charging controller 30 is further used for controlling the first switch unit 81 to be turned off and the second switch unit 82 to be turned on when the bidirectional charger 1 is in a bidirectional charging mode, and controlling the first switch unit 81 to be turned on and the second switch unit 82 to be turned off when the charging controller 30 receives an automobile starting signal.

Alternatively, as shown in fig. 7, excitation drive assembly 6 includes: a primary side of the wireless power transmission transformer 61 is electrically connected to the multiplexing node a through a first switch unit 81, and a secondary side thereof is used for receiving electric energy transmitted by the primary side; an excitation rectifying circuit 62 whose input end is electrically connected to the secondary side of the wireless power transmission transformer 61 and whose output end is electrically connected to the excitation motor 7; the charge controller 30 is also configured to receive the power transmitted by the primary side of the wireless power transmission transformer 61. The charging controller 30 obtains the output electric energy of the wireless power transmission transformer 61 in a wireless carrier mode, and then can obtain the information feedback of the exciting current, and then can control according to the information feedback of the exciting current, and obtain the feedback signal in a wireless carrier mode without arranging an additional connecting component. In other realizable embodiments, the charging controller 30 and the excitation rectifying circuit 62 may be connected through other communication methods such as a wire, so as to realize information feedback of the excitation current.

Alternatively, as shown in fig. 7 and 8, the power factor correction circuit 11 is a two-phase alternating current power factor correction circuit, or, as shown in fig. 9 and 10, fig. 9 is another circuit structure schematic diagram corresponding to the motor driving system in fig. 5, fig. 10 is another circuit structure schematic diagram corresponding to the motor driving system in fig. 6, and the power factor correction circuit 11 is a three-phase alternating current power factor correction circuit, which can further improve the power level of the bidirectional charger by using three-phase alternating current as compared with two-phase alternating current.

The embodiment of the application also provides a vehicle, which comprises the excitation motor 7 and the motor driving system in any embodiment.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.