A boost charging system

Abstract

This invention discloses a boost charging system, belonging to the field of charging technology. It includes a boost control module, a boost energy storage module, and a charging module. The boost energy storage module includes an energy storage control unit and a boost switch unit. The boost control module controls the on / off state of system charging; the energy storage control unit stores energy during charging; the boost switch unit controls the on / off state of boost charging; and the charging module controls the on / off state of power battery charging. This invention achieves boost charging by controlling the switching of the IGBT switch to charge and store energy in the inductor coil. This stored energy is then superimposed with the fast charging pile voltage, and the switching of the IGBT switch is used to perform freewheeling discharge in the inductor, thus achieving the purpose of boosting the voltage.

Description

Technical Field

[0001] This invention relates to the field of charging technology, and in particular to a boost charging system. Background Technology

[0002] With the rapid development of the pure electric vehicle industry, people have increasingly higher requirements for vehicle power performance. In order to meet the growing demand of consumers for vehicle acceleration, top speed and other performance aspects, pure electric vehicle manufacturers generally improve the performance of vehicle drive systems by increasing the output voltage of the power battery, while strictly controlling the cost of the vehicle drive system.

[0003] Currently, electric vehicles are gradually moving from 400V to 800V, but charging stations on the market come in different specifications such as 500V, 750V, and 1000V. To improve charging compatibility, electric vehicles need to have a voltage boost function to upgrade the voltage of the 500V charging station to 800V for battery charging. There are various voltage boosting methods. One approach is to use a high-power DC-DC converter, but DC-DC converters require large inductors, which are not only bulky but also expensive. Summary of the Invention

[0004] To address the aforementioned issues, this disclosure provides a boost charging system that charges and stores energy in an inductor coil by controlling the on / off state of an IGBT switch. This stored energy is then superimposed with the voltage of a fast charging station. Finally, by controlling the on / off state of the switch, the inductor is allowed to freewheel and discharge, thus achieving the purpose of boosting the voltage.

[0005] The above objectives can be achieved through the following approach:

[0006] A boost charging system includes: a boost control module, a boost energy storage module, and a charging module. The boost energy storage module includes an energy storage control unit and a boost switch unit. The boost control module has its input terminal electrically connected to the output terminal of a fast charging socket in a charging pile, and its output terminal electrically connected to the input terminal of the energy storage control unit, for controlling the on / off state of system charging. The energy storage control unit has its output terminal electrically connected to the input terminal of the boost switch unit, for system charging energy storage. The boost switch unit has its output terminal electrically connected to the input terminal of the charging module, for controlling the on / off state of the energy storage control unit's charging energy storage. The charging module has its output terminal electrically connected to the input terminal of the fast charging socket in a charging pile, for controlling the on / off state of power battery charging.

[0007] Preferably, the boost control module includes a boost positive relay switch, a first fuse, and a motor controller; wherein, the input terminal of the first fuse is electrically connected to the output terminal of the fast charging socket of the charging pile, the output terminal of the first fuse is electrically connected to the input terminal of the boost relay switch, and the output terminal of the boost relay switch is electrically connected to the input terminal of the energy storage control unit; the motor controller is electrically connected to the boost positive relay switch and is used to control the opening and closing of the boost positive relay switch.

[0008] Preferably, the energy storage control unit includes a first motor and a second motor; wherein, the output terminal of the boost relay switch is electrically connected to the neutral point of the first motor, and the output terminal of the boost relay switch is also electrically connected to the neutral point of the second motor; the three phases of the first motor are respectively electrically connected to the input terminal of the boost switch unit, and the three phases of the second motor are respectively electrically connected to the input terminal of the boost switch unit.

[0009] Preferably, the boost switching unit includes a first switching circuit, a second switching circuit, and a microcontroller unit (MCU); the first switching circuit includes transistors G1, G2, G3, G4, G5, and G6; the collectors of transistors G1, G2, and G3 are all electrically connected to the input terminal of the charging module; the emitter of transistor G1 is electrically connected to the U phase of the first motor, the emitter of transistor G2 is electrically connected to the V phase of the first motor, and the emitter of transistor G3 is electrically connected to the W phase of the first motor; the collector of transistor G4 is electrically connected to the first... The U-phase of the motor is electrically connected; the collector of transistor G5 is electrically connected to the V-phase of the first motor; the collector of transistor G6 is electrically connected to the W-phase of the first motor; the emitters of transistors G4, G5, and G6 are all electrically connected to the input terminal of the fast charging socket of the charging pile; the second switching circuit includes transistors J1, J2, J3, J4, J5, and J6; the collectors of transistors J1, J2, and J3 are all electrically connected to the input terminal of the charging module; the emitter of transistor J1 is electrically connected to the first motor. The U-phase of transistor J1 is electrically connected; the emitter of transistor J2 is electrically connected to the V-phase of the first motor; the emitter of transistor J3 is electrically connected to the W-phase of the first motor; the collector of transistor J4 is electrically connected to the U-phase of the first motor; the collector of transistor J5 is electrically connected to the V-phase of the first motor; the collector of transistor J6 is electrically connected to the W-phase of the first motor; the emitters of transistors J4, J5, and J6 are all electrically connected to the input terminal of the fast charging socket of the charging pile; the signal output terminal of the microcontroller unit (MCU) is respectively connected to the gate of transistor G1, the gate of transistor G2, and the... The gates of transistors G3, G4, G5, G6, J1, J2, J3, J4, J5, and J6 are electrically connected; the microcontroller unit (MCU) is used to control the switching on and off of transistors G1, G2, G3, G4, G5, G6, J1, J2, J3, J4, J5, and J6.

[0010] Preferably, the boost control module further includes a capacitor, one end of which is electrically connected to the output terminal of the boost positive relay switch, and the other end of which is electrically connected to the input terminal of the fast charging socket of the charging pile.

[0011] Preferably, the boost control module further includes a bleed negative relay switch and a bleed resistor. The input terminal of the bleed resistor is electrically connected to the input terminal of the fast charging socket of the charging pile, the output terminal of the bleed resistor is electrically connected to the input terminal of the bleed negative relay switch, and the output terminal of the bleed negative relay switch is electrically connected to the output terminal of the boost positive relay switch. The motor controller is also electrically connected to the bleed negative relay switch and is used to control the opening and closing of the bleed negative relay switch.

[0012] Preferably, the charging module includes a charging circuit and a battery management unit; the charging circuit includes a main positive relay switch, a main negative relay switch, a power battery, a current sensor, and a second fuse; the input terminal of the main positive relay switch is electrically connected to the collectors of transistors G1, G2, G3, J1, J2, and J3, respectively; the output terminal of the main positive relay switch is electrically connected to the input terminal of the power battery; the output terminal of the power battery is electrically connected to the input terminal of the current sensor, used to provide power to the vehicle. The system provides energy; the current sensor, whose output terminal is electrically connected to the input terminal of the main negative relay switch, is used to detect the current value of the negative DC bus of the charging module during operation; the main negative relay switch, whose output terminal is electrically connected to the input terminal of the second fuse, and the output terminal of the second fuse is electrically connected to the input terminal of the fast charging socket of the charging pile; the battery management unit, which is electrically connected to the main positive relay switch, is used to control the opening and closing of the main positive relay switch; the battery management unit is also electrically connected to the main negative relay switch, and is used to control the opening and closing of the main negative relay switch.

[0013] Preferably, the charging module further includes a pre-charging resistor and a pre-charging relay switch. The input terminal of the pre-charging resistor is electrically connected to the input terminal of the main positive relay switch, and the output terminal of the pre-charging resistor is electrically connected to the input terminal of the pre-charging relay switch. The output terminal of the pre-charging relay switch is electrically connected to the input terminal of the power battery. The battery management unit is also electrically connected to the pre-charging relay switch for controlling the opening and closing of the pre-charging relay switch.

[0014] Preferably, the boost control module further includes a boost negative relay switch, the input terminal of which is electrically connected to the second fuse, and the output terminal of which is electrically connected to the input terminal of the fast charging socket of the charging pile; the motor controller is also electrically connected to the boost negative relay switch and is used to control the opening and closing of the boost negative relay switch.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. Make full use of the existing resources of electric vehicles. The DC voltage of the fast charging pile can be boosted by using the motor stator winding coil and the IGBT in the MCU. By controlling the on and off of the IGBT transistor, the inductor coil is charged and stored. The charged and stored energy is superimposed on the voltage of the fast charging pile. Then, the switching transistor is controlled to discharge the inductor through freewheeling, thus achieving the purpose of boosting the voltage. This does not require additional investment in inductors and IGBTs, and also saves space in the vehicle.

[0017] 2. The motor controller controls the IGBT transistor to periodically close and open, and adjusts the boost value by adjusting the ratio of the two stages of inductor coil charging and inductor coil freewheeling boost to meet the different voltage requirements of different batteries.

[0018] 3. Using multiple motors to boost the voltage results in a power output far greater than that of a single motor boosting the voltage.

[0019] Other features and advantages of this disclosure will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a boost charging system according to an embodiment of the present invention.

[0022] Figure 2 This is a functional module diagram of a boost charging system according to an embodiment of the present invention.

[0023] Figure 3 This is a grayscale image of the current flow direction for motor charging and energy storage according to an embodiment of the present invention.

[0024] Figure 4 This is a grayscale image of the current flow direction of the motor freewheeling boost in an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present disclosure.

[0026] Reference Figure 1 One embodiment of the present invention proposes a boost charging system, which charges and stores energy in an inductor coil by controlling the on / off state of an IGBT switch, superimposes the stored energy with the voltage of a fast charging pile, and then controls the on / off state of the switch to perform freewheeling discharge in the inductor, thereby achieving the purpose of boosting the voltage.

[0027] The boost system in this embodiment specifically includes: a boost control module, a boost energy storage module, and a charging module. The boost energy storage module includes an energy storage control unit and a boost switching unit.

[0028] The boost control module has its input terminal electrically connected to the output terminal of the fast charging base of the charging pile, and its output terminal electrically connected to the input terminal of the energy storage control unit, and is used to control the start and stop of system charging;

[0029] The energy storage control unit, the output terminal of which is electrically connected to the input terminal of the boost switch unit, is used for charging and energy storage of the system.

[0030] The boost switch unit, whose output terminal is electrically connected to the input terminal of the charging module, is used to control the opening and closing of the energy storage control unit for charging and energy storage.

[0031] The charging module, whose output terminal is electrically connected to the input terminal of the fast charging socket of the charging pile, is used to control the charging start and stop of the power battery.

[0032] For example, the fast charging station of the charging pile is preferably a DC fast charging pile, which is used to provide high-power DC power at a specified voltage to the fast charging boost system of the vehicle. DC fast charging piles can be divided into high-voltage DC fast charging piles and non-high-voltage DC fast charging piles according to the voltage value of the output voltage. The vehicle has a power battery voltage, such as a preset voltage. When the voltage value of the DC current provided by the charging pile is greater than or equal to the power battery voltage, fast charging can be performed. However, when the voltage value of the DC current provided by the charging pile is less than the power battery voltage, the system first charges and stores energy by the energy storage control unit, and then the system turns on the boost switching unit to make the energy storage control unit start discharging, so that the voltage of the energy storage control unit is superimposed with the voltage of the DC fast charging pile to boost the voltage, thereby realizing fast charging boost.

[0033] Preferably, the boost control module includes a boost positive relay switch, a first fuse, and a motor controller; wherein,

[0034] The input terminal of the first fuse is electrically connected to the output terminal of the fast charging socket of the charging pile, the output terminal of the first fuse is electrically connected to the input terminal of the boost relay switch, and the output terminal of the boost relay switch is electrically connected to the input terminal of the energy storage control unit.

[0035] The motor controller is electrically connected to the boost positive relay and is used to control the opening and closing of the boost positive relay.

[0036] For example, such as Figure 2 As shown, the boost control module includes a relay switch S1, a fuse F1, and a motor controller. When the user performs fast charging, the motor controller controls the relay switch S1 to close. The fuse F1 is used to protect the boost control module in case of a relay switch S1 sticking together, preventing safety issues.

[0037] Preferably, the energy storage control unit includes a first motor and a second motor;

[0038] The output terminal of the boost relay switch is electrically connected to the neutral point of the first motor, and the output terminal of the boost relay switch is also electrically connected to the neutral point of the second motor; the three phases of the first motor are electrically connected to the input terminals of the boost switch unit, and the three phases of the second motor are electrically connected to the input terminals of the boost switch unit.

[0039] For example, such as Figure 2 As shown, the energy storage control unit includes motor MOTOR1 and motor MOTOR2. When the user uses high-voltage DC fast charging, the current from the fast charging base of the charging pile flows out from the positive terminal and enters motor MOTOR1 and motor MOTOR2 through relay switch S1. The current enters the boost switching unit from the neutral point of motor MOTOR1 and the neutral point of motor MOTOR2, thereby realizing the charging and energy storage of the stator coils of motor MOTOR1 and motor MOTOR2.

[0040] Preferably, the boost switching unit includes a first switching circuit, a second switching circuit, and a microcontroller unit (MCU).

[0041] The first switching circuit includes transistors G1, G2, G3, G4, G5, and G6.

[0042] The collectors of transistor G1, transistor G2, and transistor G3 are all electrically connected to the input terminal of the charging module; the emitter of transistor G1 is electrically connected to the U phase of the first motor, the emitter of transistor G2 is electrically connected to the V phase of the first motor, and the emitter of transistor G3 is electrically connected to the W phase of the first motor.

[0043] The collector of transistor G4 is electrically connected to the U phase of the first motor, the collector of transistor G5 is electrically connected to the V phase of the first motor, and the collector of transistor G6 is electrically connected to the W phase of the first motor; the emitters of transistor G4, transistor G5, and transistor G6 are all electrically connected to the input terminal of the fast charging socket of the charging pile.

[0044] The second switching circuit includes transistors J1, J2, J3, J4, J5, and J6;

[0045] The collectors of transistor J1, J2, and J3 are all electrically connected to the input terminal of the charging module; the emitter of transistor J1 is electrically connected to the U phase of the first motor, the emitter of transistor J2 is electrically connected to the V phase of the first motor, and the emitter of transistor J3 is electrically connected to the W phase of the first motor.

[0046] The collector of transistor J4 is electrically connected to the U phase of the first motor, the collector of transistor J5 is electrically connected to the V phase of the first motor, and the collector of transistor J6 is electrically connected to the W phase of the first motor; the emitters of transistor J4, transistor J5, and transistor J6 are all electrically connected to the input terminal of the fast charging socket of the charging pile.

[0047] The signal output terminal of the microcontroller unit (MCU) is electrically connected to the gates of transistors G1, G2, G3, G4, G5, G6, J1, J2, J3, J4, J5, and J6, respectively.

[0048] The microcontroller unit (MCU) is used to control the on / off state of transistors G1, G2, G3, G4, G5, G6, J1, J2, J3, J4, J5, and J6.

[0049] For example, such as Figure 2 As shown, the microcontroller unit (MCU) can be an automotive-grade MCU such as CCFC3010PT, AC78022, or FC7240. The first switching circuit includes transistors G1, G2, G3, G4, G5, and G6, and the second switching circuit includes transistors J1, J2, J3, J4, J5, and J6. The control word unit (MCU) controls the switching of the transistors to realize the energy storage and discharge of motors MOTOR1 and MOTOR2, thereby achieving system boost charging.

[0050] It should be noted that transistors G1, G2, G3, G4, G5, G6, J1, J2, J3, J4, J5, and J6 are all insulated gate bipolar transistors (IGBTs).

[0051] For example, such as Figure 3 As shown, when the microcontroller unit (MCU) detects that the fast charging dock of the charging pile is a high-voltage DC fast charging pile, the motor controller controls the relay switch S1 to close, and the MCU controls transistors G1, G2, G3, J1, J2, and J3 to open. At the same time, the MCU controls transistors G4, G5, G6, J4, J5, and J6 to close. The current of the fast charging dock of the charging pile flows out from the positive terminal, enters the neutral points of motors MOTOR1 and MOTOR2 through transistors G4, G5, G6, J4, J5, and J6, and then returns to the negative terminal of the fast charging dock of the charging pile through the lower bridge arm. At this time, the stator coils of motors MOTOR1 and MOTOR2 are charged and stored.

[0052] For example, such as Figure 4 As shown, the microcontroller unit (MCU) controls transistors G1, G2, G3, J1, J2, and J3 to close, while simultaneously controlling transistors G4, G5, G6, J4, J5, and J6 to open. The inductor current direction cannot change abruptly, ensuring that the stored electrical energy voltage of motors MOTOR1 and MOTOR2 is superimposed with the fast charging base voltage of the charging pile, and enters the positive terminal of the power battery through the upper bridge arm, thereby charging the power battery.

[0053] It should be noted that the microcontroller unit (MCU) controls the IGBT switching based on the relationship between the voltage value of the DC current provided by the charging pile and the preset voltage value. When the voltage value of the DC current provided by the charging pile is greater than the preset voltage value, the MCU controls transistors G1, G2, G3, J1, J2, and J3 to turn on. When the voltage value of the DC current provided by the charging pile is less than the preset voltage value, the MCU controls the IGBT transistors to periodically close and open, and the MCU adjusts the ratio of the IGBT transistor closing time to the opening time according to the voltage value of the DC current provided by the charging pile.

[0054] Preferably, the boost control module further includes a capacitor, one end of which is electrically connected to the output terminal of the boost positive relay switch, and the other end of which is electrically connected to the input terminal of the fast charging socket of the charging pile.

[0055] For example, such as Figure 2 As shown, capacitor C1 is connected in parallel with the power battery to smooth out voltage fluctuations caused by current during fast charging.

[0056] Preferably, the boost control module further includes a bleed negative relay switch and a bleed resistor. The input terminal of the bleed resistor is electrically connected to the input terminal of the fast charging socket of the charging pile, the output terminal of the bleed resistor is electrically connected to the input terminal of the bleed negative relay switch, and the output terminal of the bleed negative relay switch is electrically connected to the output terminal of the boost positive relay switch.

[0057] The motor controller is also electrically connected to the discharge negative relay switch, and is used to control the opening and closing of the discharge negative relay switch.

[0058] For example, such as Figure 2 As shown, the boost control module also includes a relay switch S2 and a resistor R1. After charging is completed, the motors MOTOR1, MOTOR2 and capacitor C1 store a certain amount of electricity, which needs to be discharged. At this time, the relay switch S2 is closed, and the electricity stored in the motors MOTOR1, MOTOR2 and capacitor C1 is consumed as heat through the resistor R1, ensuring the safety of the system.

[0059] Preferably, the charging module includes a charging circuit and a battery management unit;

[0060] The charging circuit includes a main positive relay switch, a main negative relay switch, a power battery, a current sensor, and a second fuse. The input terminal of the main positive relay switch is electrically connected to the collectors of transistors G1, G2, G3, J1, J2, and J3, respectively. The output terminal of the main positive relay switch is electrically connected to the input terminal of the power battery.

[0061] The power battery, the output terminal of which is electrically connected to the input terminal of the current sensor, is used to provide energy to the vehicle;

[0062] The current sensor, the output terminal of which is electrically connected to the input terminal of the main negative relay switch, is used to detect the current value of the negative DC bus of the charging module during operation.

[0063] The main negative relay switch, the output terminal of the main negative relay switch is electrically connected to the input terminal of the second fuse, and the output terminal of the second fuse is electrically connected to the input terminal of the fast charging socket of the charging pile;

[0064] The battery management unit is electrically connected to the main positive relay switch and is used to control the opening and closing of the main positive relay switch;

[0065] The battery management unit is also electrically connected to the main and negative relay switch and is used to control the opening and closing of the main and negative relay switch.

[0066] For example, the battery management unit can be a battery management system (BMS). The charging circuit includes a relay switch S4, a relay switch S5, a power battery, a current sensor, and a fuse F2. The BMS controls the relay switches S4 and S5 to close, thereby charging the power battery. The fuse F2 is connected in series with the power battery, thereby ensuring that the output current of the power battery is within a preset range. When the fuse F2 is opened, the BMS controls the relay switches S4 and S5 to open, thereby ensuring the safety of the power battery.

[0067] Preferably, the charging module further includes a pre-charging resistor and a pre-charging relay switch. The input terminal of the pre-charging resistor is electrically connected to the input terminal of the main positive relay switch, the output terminal of the pre-charging resistor is electrically connected to the input terminal of the pre-charging relay switch, and the output terminal of the pre-charging relay switch is electrically connected to the input terminal of the power battery.

[0068] The battery management unit is also electrically connected to the precharge relay switch and is used to control the opening and closing of the precharge relay switch.

[0069] For example, such as Figure 2As shown, the charging module also includes a resistor R2 and a relay switch S6. Resistor R2 and relay switch S6 form the pre-charging circuit of relay switch S5. When the user starts charging, there is no energy in capacitor C1. The BMS controls relay switches S4 and S6 to close. At the moment the circuit closes, a large current flows through resistor R2 and into the power battery, thereby reducing the damage of the inrush current to the system and improving system safety. When the system voltage stabilizes, the BMS controls relay switch S5 to close and simultaneously controls relay switch S6 to open, thereby charging the power battery.

[0070] Preferably, the boost control module further includes a boost negative relay switch, the input terminal of which is electrically connected to the second fuse, and the output terminal of which is electrically connected to the input terminal of the fast charging socket of the charging pile;

[0071] The motor controller is also electrically connected to the boost negative relay switch and is used to control the opening and closing of the boost negative relay switch.

[0072] For example, such as Figure 3 As shown, the boost control module also includes a relay switch S3. When the stator coils of motor MOTOR1 and motor MOTOR2 are charging, the motor controller controls the relay switch S3 to disconnect, thereby preventing the current from damaging the charging module.

[0073] It should be noted that the electrical connections between the various units mentioned above do not necessarily represent the connections between lines. Any indirect connection method can be applied to the embodiments of this disclosure as long as it achieves the purpose of this disclosure.

[0074] The above description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of other embodiments of this disclosure upon considering the specification and the disclosure of practical truths. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described in this disclosure.

Claims

1. A boost charging system, characterized by, The system comprises a voltage boost control module, a voltage boost energy storage module and a charging module, the voltage boost energy storage module comprises an energy storage control unit and a voltage boost switch unit; wherein The input end of the voltage boost control module is electrically connected with the output end of the fast charging seat of the charging pile, the output end of the voltage boost control module is electrically connected with the input end of the energy storage control unit, and the voltage boost control module is used for controlling the opening and closing of system charging; The output end of the energy storage control unit is electrically connected with the input end of the voltage boost switch unit, and the energy storage control unit is used for charging energy storage of the system; The output end of the voltage boost switch unit is electrically connected with the input end of the charging module, and the voltage boost switch unit is used for controlling the opening and closing of the energy storage control unit charging energy storage; The output end of the charging module is electrically connected with the input end of the fast charging seat of the charging pile, and the charging module is used for controlling the opening and closing of the charging of the power battery; The energy storage control unit comprises a first motor and a second motor; The voltage boost control module comprises a voltage boost relay switch, a first fuse and a motor controller; wherein The input end of the first fuse is electrically connected with the output end of the fast charging seat of the charging pile, the output end of the first fuse is electrically connected with the input end of the voltage boost relay switch, and the output end of the voltage boost relay switch is electrically connected with the input end of the energy storage control unit; The motor controller is electrically connected with the voltage boost relay switch, and is used for controlling the opening and closing of the voltage boost relay switch; The output end of the voltage boost relay switch is electrically connected with the neutral point of the first motor, and the output end of the voltage boost relay switch is also electrically connected with the neutral point of the second motor; the three phases of the first motor are respectively electrically connected with the input end of the voltage boost switch unit, and the three phases of the second motor are respectively electrically connected with the input end of the voltage boost switch unit; The voltage boost switch unit comprises a first switch circuit, a second switch circuit and a micro control unit MCU; The first switch circuit comprises transistors G1, G2, G3, G4, G5 and G6; The collector of the transistor G1, the collector of the transistor G2 and the collector of the transistor G3 are all electrically connected with the input end of the charging module; the emitter of the transistor G1 is electrically connected with the U phase of the first motor, the emitter of the transistor G2 is electrically connected with the V phase of the first motor, and the emitter of the transistor G3 is electrically connected with the W phase of the first motor; The collector of the transistor G4 is electrically connected with the U phase of the first motor, the collector of the transistor G5 is electrically connected with the V phase of the first motor, and the collector of the transistor G6 is electrically connected with the W phase of the first motor; the emitter of the transistor G4, the emitter of the transistor G5 and the emitter of the transistor G6 are all electrically connected with the input end of the fast charging seat of the charging pile; The second switch circuit comprises transistors J1, J2, J3, J4, J5 and J6; The collector of the transistor J1, the collector of the transistor J2 and the collector of the transistor J3 are electrically connected with the input end of the charging module; the emitter of the transistor J1 is electrically connected with the U phase of the first motor, the emitter of the transistor J2 is electrically connected with the V phase of the first motor, and the emitter of the transistor J3 is electrically connected with the W phase of the first motor; The collector of the transistor J4 is electrically connected with the U phase of the first motor, the collector of the transistor J5 is electrically connected with the V phase of the first motor, and the collector of the transistor J6 is electrically connected with the W phase of the first motor; the emitter of the transistor J4, the emitter of the transistor J5 and the emitter of the transistor J6 are electrically connected with the input end of the fast charging seat of the charging pile; The signal output end of the micro control subunit MCU is electrically connected with the gate of the transistor G1, the gate of the transistor G2, the gate of the transistor G3, the gate of the transistor G4, the gate of the transistor G5, the gate of the transistor G6, the gate of the transistor J1, the gate of the transistor J2, the gate of the transistor J3, the gate of the transistor J4, the gate of the transistor J5 and the gate of the transistor J6 respectively; The micro control subunit MCU is used for controlling the on-off of the transistor G1, the transistor G2, the transistor G3, the transistor G4, the transistor G5, the transistor G6, the transistor J1, the transistor J2, the transistor J3, the transistor J4, the transistor J5 and the transistor J6.

2. A boost charging system according to claim 1, wherein The boost control module further comprises a capacitor, one end of the capacitor is electrically connected with the output end of the boost positive relay switch, and the other end of the capacitor is electrically connected with the input end of the fast charging seat of the charging pile.

3. A boost charging system according to claim 1, wherein The boost control module further comprises a discharge negative relay switch and a discharge resistor, the input end of the discharge resistor is electrically connected with the input end of the fast charging seat of the charging pile, the output end of the discharge resistor is electrically connected with the input end of the discharge negative relay switch, and the output end of the discharge negative relay switch is electrically connected with the output end of the boost positive relay switch. The motor controller is further electrically connected with the discharge negative relay switch and is used for controlling the opening and closing of the discharge negative relay switch.

4. A boost charging system according to claim 1, wherein The charging module comprises a charging circuit and a battery management unit; The charging circuit comprises a main positive relay switch, a main negative relay switch, a power battery, a current sensor and a second fuse, the input end of the main positive relay switch is electrically connected with the collector of the transistor G1, the collector of the transistor G2, the collector of the transistor G3, the collector of the transistor J1, the collector of the transistor J2 and the collector of the transistor J3 respectively, and the output end of the main positive relay switch is electrically connected with the input end of the power battery; The power battery, the output end of the power battery is electrically connected with the input end of the current sensor and is used for providing energy for a vehicle; The current sensor, the output end of the current sensor is electrically connected with the input end of the main negative relay switch, and is used for detecting the current value of the negative direct current bus of the charging module in the working process; The main negative relay switch, the output end of the main negative relay switch is electrically connected with the input end of the second fuse, and the output end of the second fuse is electrically connected with the input end of the fast charging seat of the charging pile; The battery management unit, the battery management unit is electrically connected with the main positive relay switch, and is used for controlling the opening and closing of the main positive relay switch; The battery management unit, the battery management unit is also electrically connected with the main negative relay switch, and is used for controlling the opening and closing of the main negative relay switch.

5. A boost charging system according to claim 4, wherein The charging module further comprises a pre-charging resistor and a pre-charging relay switch, the input end of the pre-charging resistor is electrically connected with the input end of the main positive relay switch, the output end of the pre-charging resistor is electrically connected with the input end of the pre-charging relay switch, and the output end of the pre-charging relay switch is electrically connected with the input end of the power battery; The battery management unit is also electrically connected with the pre-charging relay switch, and is used for controlling the opening and closing of the pre-charging relay switch.

6. A boost charging system according to claim 4, wherein The boost control module further comprises a boost negative relay switch, the input end of the boost negative relay switch is electrically connected with the second fuse, and the output end of the boost negative relay switch is electrically connected with the input end of the fast charging seat of the charging pile; The motor controller is also electrically connected with the boost negative relay switch, and is used for controlling the opening and closing of the boost negative relay switch.

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