A power supply system of a drive motor of an electric vehicle and an electric vehicle

Abstract

The application provides a power supply system of a driving motor of an electric vehicle and the electric vehicle, and the power supply system comprises: a first power supply; a first power supply circuit electrically connected with the first power supply, used for supplying power for a system basic chip (SBC) and supplying power for upper and lower bridges of the driving motor; a second power supply; a second power supply circuit electrically connected with the second power supply, used for supplying power for the lower bridge of the driving motor; the power supply voltage of the second power supply is higher than that of the first power supply; when the first power supply circuit fails, the second power supply circuit is used for supplying power for the lower bridge of the driving motor, so that the driving motor enters a short circuit state; when the second power supply circuit fails, the first power supply circuit is used for supplying power for the upper bridge of the driving motor, so that the driving motor enters a short circuit state. The scheme improves the active safety performance of the electric vehicle.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a power supply system for a drive motor of an electric vehicle and the electric vehicle itself. Background Technology

[0002] With the development of the new energy vehicle industry, the functions of automotive electronic systems are becoming increasingly complex. Ensuring the functional safety of electronic and electrical systems has become a key focus and research direction for the industry. Existing technologies provide design processes for the functional safety of road vehicles, playing a crucial role in introducing the concept of functional safety. However, the lack of corresponding hardware architecture implementation makes it impossible to quickly bring the vehicle into a functional safety state when abnormal events occur. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a power supply system for the drive motor of an electric vehicle and the electric vehicle itself. This improves the active safety performance of the electric vehicle.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] A power supply system for a drive motor of an electric vehicle, comprising:

[0006] First power supply;

[0007] The first power supply circuit, which is electrically connected to the first power supply, is used for powering the system base chip SBC and the upper and lower bridge power supplies for the drive motor.

[0008] Second power supply;

[0009] A second power supply circuit electrically connected to the second power supply is used to supply power to the lower bridge of the drive motor; the supply voltage of the second power supply is higher than the supply voltage of the first power supply.

[0010] When the first power supply circuit fails, the second power supply circuit supplies power to the lower bridge of the drive motor, causing the drive motor to enter a short circuit state.

[0011] When the second power supply circuit fails, the first power supply circuit supplies power to the upper bridge of the drive motor, causing the drive motor to enter a short-circuit state.

[0012] Optionally, the first power supply circuit includes:

[0013] A first filter electrically connected to the first power supply is used to filter the first voltage provided by the first power supply to obtain a first target voltage;

[0014] The system base chip SBC power supply, which is electrically connected to the first filter, is used to provide the first target voltage to the system base chip SBC.

[0015] A first conversion power supply electrically connected to the first filter is used to convert the first target voltage into the upper bridge power supply voltage and the lower bridge power supply voltage of the drive motor;

[0016] The upper bridge power supply, which is electrically connected to the first conversion power supply, is used to provide the upper bridge power supply voltage to the upper bridge.

[0017] The lower bridge power supply, which is electrically connected to the first conversion power supply, is used to provide the lower bridge power supply voltage to the lower bridge.

[0018] Optionally, the power supply for the system base chip SBC includes:

[0019] Digital component power supply, used to power the data components of the microprocessor unit (MCU);

[0020] Analog component power supply, used to power the analog components of the microprocessor unit (MCU);

[0021] The Controller Area Network (CAN) power supply provides power for CAN communication within the CAN network.

[0022] Optionally, the first conversion power supply includes: a first transistor switch, a second transistor switch, a first transformer, a first diode, a second diode, a first capacitor, a second capacitor, and a third capacitor;

[0023] The gate of the first transistor switch is electrically connected to the microprocessor unit (MCU), the source is input with the first target voltage, and the drain is electrically connected to the first terminal of the first transformer.

[0024] The gate of the second transistor switch is electrically connected to the microprocessor unit (MCU), the source is input with the first target voltage, and the drain is electrically connected to the second terminal of the first transformer.

[0025] The third terminal of the first transformer is electrically connected to the input terminal of the first diode, and the fourth terminal of the first transformer is electrically connected to the output terminal of the second diode.

[0026] The first diode is electrically connected to the second diode through the second capacitor and the third capacitor;

[0027] The first capacitor is connected between the positive and negative terminals of the first target voltage, and both the first transistor switch and the second transistor switch are N-type metal-oxide transistors.

[0028] Optionally, a control circuit is further connected between the upper bridge power supply and the lower bridge power supply to control the lower bridge power supply to provide the lower bridge power supply voltage to the lower bridge.

[0029] Optionally, the control circuit includes: a third transistor switch and a fourth transistor switch;

[0030] The source of the third transistor switch is electrically connected to the output terminal of the first conversion power supply;

[0031] The drain of the fourth transistor switch is electrically connected to the input terminal of the lower bridge power supply.

[0032] The gate of the third transistor switch is electrically connected to the source of the fourth transistor switch. The third transistor switch is a P-type metal-oxide transistor, and the fourth transistor switch is an N-type metal-oxide transistor.

[0033] Optionally, the second power supply circuit includes:

[0034] The second filter, which is electrically connected to the second power supply, is used to filter the second voltage provided by the second power supply to obtain the second target voltage;

[0035] The second conversion power supply, which is electrically connected to the second filter, is used to convert the second target voltage into the lower bridge power supply voltage of the drive motor, and to provide the lower bridge power supply voltage to the lower bridge.

[0036] Optionally, the second filter includes:

[0037] The fuse FUSE is electrically connected to the second power supply.

[0038] The first inductor is connected in series with the fuse FUSE, and the first inductor is grounded through the fourth capacitor;

[0039] A second inductor is connected in series with the first inductor, and the second inductor is grounded through a fifth capacitor.

[0040] Optionally, the second conversion power supply includes: a sixth capacitor, a second transformer, a fifth transistor switch, a clamping diode, an input diode, a seventh capacitor, and a drive circuit;

[0041] The sixth capacitor is electrically connected to the second power supply.

[0042] One side of the second transformer is electrically connected to the second power supply and is connected in parallel with the clamping diode, while the other side is connected in parallel with the seventh capacitor through the input diode;

[0043] The second transformer is electrically connected to the drive circuit through the fifth transistor and a resistor.

[0044] Embodiments of the present invention also provide an electric vehicle including a power supply system for a drive motor as described above.

[0045] The above-described solution of the present invention has at least the following beneficial effects:

[0046] In the above-described solution of the present invention, when the first power supply circuit fails, the second power supply circuit supplies power to the lower bridge of the drive motor, causing the drive motor to enter a short-circuit state; when the second power supply circuit fails, the first power supply circuit supplies power to the upper bridge of the drive motor, causing the drive motor to enter a short-circuit state. This enables the electric vehicle to actively park, thereby improving the active safety performance of the electric vehicle. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the first power supply circuit in the power supply system of the drive motor of the electric vehicle of the present invention.

[0048] Figure 2 This is a schematic diagram of the second power supply circuit in the power supply system of the drive motor of the electric vehicle of the present invention.

[0049] Figure 3 This is a schematic diagram of the circuit structure of the first conversion power supply in the power supply system of the drive motor of the electric vehicle of the present invention.

[0050] Figure 4 This is a schematic diagram of the control circuit in the power supply system of the drive motor of the electric vehicle of the present invention.

[0051] Figure 5 This is a schematic diagram of the second filter in the power supply system of the drive motor of the electric vehicle of the present invention;

[0052] Figure 6 This is a schematic diagram of the circuit structure of the second conversion power supply in the power supply system of the drive motor of the electric vehicle of the present invention. Detailed Implementation

[0053] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0054] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a power supply system for a drive motor of an electric vehicle, comprising:

[0055] First power supply;

[0056] The first power supply circuit, which is electrically connected to the first power supply, is used to supply power to the system base chip SBC and to supply power to the upper and lower bridges of the drive motor.

[0057] Second power supply;

[0058] A second power supply circuit electrically connected to the second power supply is used to supply power to the lower bridge of the drive motor; the supply voltage of the second power supply is higher than the supply voltage of the first power supply.

[0059] When the first power supply circuit fails, the second power supply circuit supplies power to the lower bridge of the drive motor, causing the drive motor to enter a short circuit state.

[0060] When the second power supply circuit fails, the first power supply circuit supplies power to the upper bridge of the drive motor, causing the drive motor to enter a short-circuit state.

[0061] In this embodiment, the key functional safety objective of the motor driver is the torque safety of the motor controller. The torque safety state is the Active Short Circuit (ASC) state. This primarily involves short-circuiting the U, V, and W phases of the drive motor (achieved through IGBT switching, either by short-circuiting the upper or lower three bridge arms), serving as a safety protection mechanism for the motor system (such as Freewheeling or ASC). In severe fault conditions, the ASC three-phase short circuit protects or prevents further damage to the controller's electrical system.

[0062] In addition, there are some other situations:

[0063] 1) When the vehicle loses control, implementing ASC can generate reverse torque, causing the vehicle to brake slowly and come to a safe stop.

[0064] 2) When the power battery fails, implementing ASC can isolate the drive motor, motor controller and power battery side, ensuring the high voltage safety of the whole vehicle.

[0065] 3) When the drive motor speed is too high or abnormal during vehicle operation, implementing ASC can prevent excessive back EMF from damaging the power battery, bus capacitor and other high-voltage components.

[0066] 4) When a switching transistor (IGBT) in the inverter circuit of the motor controller fails, implementing ASC can prevent uncontrolled rectification from damaging other devices or the power battery.

[0067] The power supply for an MCU (motor control unit) is divided into three parts: the SBC (system basis chip) power supply, the upper bridge power supply, and the lower bridge power supply. Ensuring the independence of the upper bridge and lower bridge power supplies can meet the torque safety power supply requirements of the motor controller.

[0068] The MCU is powered by a low-voltage battery on one hand and a high-voltage battery on the other.

[0069] Starting from the low-voltage battery, after passing through the filter, it splits into two paths: one of which supplies power to the SBC (system basis chip).

[0070] This power supply typically provides at least three independent power outputs: digital power, analog power, and CAN communication power.

[0071] Digital power supply: generally used to power the digital part of the main MCU, other digital chip parts, and functional safety logic judgment parts.

[0072] Analog power supply: generally used for the analog section of the main MCU, resolver, current sensor, temperature sensor, other references, and some analog pull-up and pull-down resistors.

[0073] CAN communication power supply: Generally powered by the CAN chip.

[0074] In this embodiment, when the first power supply circuit fails, the second power supply circuit supplies power to the lower bridge of the drive motor, causing the drive motor to enter a short-circuit state; when the second power supply circuit fails, the first power supply circuit supplies power to the upper bridge of the drive motor, causing the drive motor to enter a short-circuit state. This enables the electric vehicle to actively park, thereby improving the active safety performance of the electric vehicle.

[0075] In an optional embodiment of the present invention, the first power supply circuit includes:

[0076] A first filter electrically connected to the first power supply is used to filter the first voltage provided by the first power supply to obtain a first target voltage;

[0077] The system base chip SBC power supply, which is electrically connected to the first filter, is used to provide the first target voltage to the system base chip SBC.

[0078] A first conversion power supply electrically connected to the first filter is used to convert the first target voltage into the upper bridge power supply voltage and the lower bridge power supply voltage of the drive motor;

[0079] The upper bridge power supply, which is electrically connected to the first conversion power supply, is used to provide the upper bridge power supply voltage to the upper bridge.

[0080] The lower bridge power supply, which is electrically connected to the first conversion power supply, is used to provide the lower bridge power supply voltage to the lower bridge.

[0081] In this embodiment, the power supply for the upper bridge uses three isolation transformers T1, T2, and T3 to convert the 15V stable voltage into the +15 / -8V voltage used by the upper bridge to drive the IGBT, thus completing the power supply for the upper bridge.

[0082] The lower bridge power supply is a stable 15V voltage, which is converted into the +15 / -8V voltage used by the lower bridge driver IGBT through the lower bridge transformers T4, T5, and T6.

[0083] The power supply for the system's basic chip SBC includes:

[0084] Digital component power supply, used to power the data components of the microprocessor unit (MCU);

[0085] Analog component power supply, used to power the analog components of the microprocessor unit (MCU);

[0086] The Controller Area Network (CAN) power supply provides power for CAN communication within the CAN network.

[0087] In this embodiment, the first conversion power supply converts the voltage (9V~16V) of the first power supply (i.e., the low-voltage battery) into a stable 15V voltage.

[0088] This power supply typically uses a SEPIC (single-ended primary inductor converter). The biggest advantage of this circuit is that the input and output are of the same polarity. It is particularly suitable for battery-powered applications, allowing the battery voltage to be higher or lower than the required input voltage. For example, if a battery voltage is 9V to 16V, and the load requires 15V, the SEPIC circuit can achieve this conversion. Another advantage is input-output isolation, achieved through capacitors in the main circuit. It also has a complete shutdown function; when the switching transistor is off, the output voltage is 0V.

[0089] like Figure 3 As shown, in an optional embodiment of the present invention, the first conversion power supply includes: a first transistor switch Q1, a second transistor switch Q2, a first transformer T7, a first diode D4, a second diode D5, a first capacitor C1, a second capacitor C2, and a third capacitor C3.

[0090] The gate of the first transistor switch Q1 is electrically connected to the microprocessor unit MCU, the source is input with the first target voltage, and the drain is electrically connected to the first terminal (i.e., NP1 terminal) of the first transformer T7.

[0091] The gate of the second transistor switch Q2 is electrically connected to the microprocessor unit MCU, the source is input with the first target voltage, and the drain is electrically connected to the first terminal (i.e., NP2 terminal) of the first transformer T7.

[0092] The third terminal (Ns1 terminal) of the first transformer T7 is electrically connected to the input terminal of the first diode D4, and the fourth terminal (Ns2 terminal) of the first transformer T7 is electrically connected to the output terminal of the second diode D5.

[0093] The first diode D4 is electrically connected to the second diode (D5) through the second capacitor C2 and the third capacitor C3;

[0094] The first capacitor C1 is connected between the positive and negative terminals of the first target voltage, and the first transistor switch Q1 and the second transistor switch Q2 are both N-type metal-oxide transistors.

[0095] In this embodiment, a stable 15V supply directly powers the upper bridge power supply; this power supply mainly consists of two N-MOS transistors, a transformer, two output diodes, and a capacitor. No additional drive circuitry is required, resulting in optimal cost-effectiveness.

[0096] In an optional embodiment of the present invention, a control circuit is further connected between the upper bridge power supply and the lower bridge power supply for controlling the lower bridge power supply to provide the lower bridge power supply voltage to the lower bridge.

[0097] like Figure 4 As shown, the control circuit includes: a third transistor switch Q3 and a fourth transistor switch Q4;

[0098] The source of the third transistor switch Q3 is electrically connected to the output terminal of the first conversion power supply.

[0099] The drain of the fourth transistor switch Q4 is electrically connected to the input terminal of the lower bridge power supply.

[0100] The gate of the third transistor switch Q3 is electrically connected to the source of the fourth transistor switch Q4. The third transistor switch Q3 is a P-type metal-oxide transistor, and the fourth transistor switch Q4 is an N-type metal-oxide transistor.

[0101] In this embodiment, the lower bridge power supply is supplied by adding a control circuit (P_mos+N_mos). This circuit enables the MCU to control the power supply of the lower bridge, and the upper and lower bridge power supplies together form the basic bridge arm power supply.

[0102] In an optional embodiment of the present invention, the second power supply circuit includes:

[0103] The second filter, which is electrically connected to the second power supply, is used to filter the second voltage provided by the second power supply to obtain the second target voltage;

[0104] The second conversion power supply, which is electrically connected to the second filter, is used to convert the second target voltage into the lower bridge power supply voltage of the drive motor, and to provide the lower bridge power supply voltage to the lower bridge.

[0105] Among them, such as Figure 5 As shown, the second filter includes:

[0106] The fuse FUSE is electrically connected to the second power supply.

[0107] The first inductor L4 is connected in series with the fuse FUSE, and the first inductor L4 is grounded through the fourth capacitor C4;

[0108] A second inductor L5 is connected in series with the first inductor L4, and the second inductor L5 is grounded through the fifth capacitor C5.

[0109] In this embodiment, to meet functional safety requirements, a second conversion power supply (60V~500V to 15V) that draws power from a high-voltage battery is added to the lower bridge.

[0110] High-voltage power supplies typically draw power from the collector (C) and emitter (E) terminals of the IGBTs. Since IGBT turn-off generates high-voltage spikes, these spikes can affect the stability of the high-voltage power supply. Therefore, a second high-voltage filter (a staged high-voltage filter) is usually added before designing the power supply. This filter consists of a FUSE, L4, C4, L5, and C5. The FUSE prevents damage to the high-voltage power supply from causing a short circuit in the entire MCU input, resulting in system input failure. L4 and C4 form a single-stage LC filter, and L5 and C5 form another single-stage LC filter. These two stages of filtering enhance the filtering effect against input spikes.

[0111] like Figure 6 As shown, in an optional embodiment of the present invention, the second conversion power supply includes: a sixth capacitor C6, a second transformer T8, a fifth transistor switch Q5, a clamping diode D6, an input diode D7, a seventh capacitor C7, and a driving circuit IC1;

[0112] The sixth capacitor C6 is electrically connected to the second power supply.

[0113] One side of the second transformer T8 is electrically connected to the second power supply and is connected in parallel with the clamping diode D6, while the other side is connected in parallel with the seventh capacitor C7 through the input diode D7;

[0114] The second transformer T8 is electrically connected to the drive circuit IC1 through the fifth transistor Q5 and a resistor R1.

[0115] In this embodiment, the operating range of the high-voltage conversion power supply is 60V to 500V. Such a wide voltage conversion range generally uses a flyback topology. The flyback power supply consists of a sixth capacitor C6 (high-voltage input capacitor), a second transformer T8, a switching MOS Q1, a clamping diode D6, an input diode D7, and a driver IC1.

[0116] Furthermore, in the case of high-voltage power supply, such as Figure 1 As shown, this high-voltage power supply outputs 15V, which, through diodes D1, D2, and D3 and inductors L1, L2, and L3, provides redundant power to the lower three bridges. According to ASC requirements, a functional safety state is achieved as long as one of the bridge arms of the upper or lower three bridges is short-circuited. As long as power is supplied to the upper and lower three bridges when a fault occurs, the functional safety requirements can be met.

[0117] The operation of the circuit described above in this invention is as follows:

[0118] 1. When the upper three bridges fail, the upper bridge power supply fails, which in turn causes the low-voltage battery conversion power supply to also fail. At this time, the lower bridge power supply, which shares a conversion power supply, will also fail. In this case, shut down the upper and lower bridge power supplies and supply power to the lower three bridges through the high-voltage power supply to put the circuit into the functional safety state of the lower bridge ASC.

[0119] 2. When the lower three bridges fail, the power supply to the lower three bridges will also fail. At this time, the high-voltage power supply will also be unable to guarantee the power supply to the lower bridges due to the failure of the lower bridge power supply. In this case, we can shut down the lower bridge power supply through the control module, so that the upper bridge power supply can still work normally, allowing the circuit to enter the functional safety state of the upper bridge ASC.

[0120] 3. The output of the high-voltage power supply should be slightly lower than that of the lower bridge power supply to reduce losses. This ensures that the lower bridge power supply powers the IGBT under normal operating conditions. Additionally, diodes and a 100uH inductor should be added to prevent inter-phase interference.

[0121] The above embodiments of the present invention have achieved functional safety requirements at the hardware power supply level. When an abnormal event occurs, it can quickly enter a functional safety state, and can realize independent power supply for the upper and lower bridges and high-voltage redundant power supply to meet power supply requirements and improve the active safety performance of electric vehicles.

[0122] Embodiments of the present invention also provide an electric vehicle, including a power system for a drive motor as described above. All implementations in the above embodiments are applicable to embodiments of this vehicle and can achieve the same technical effects.

[0123] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power supply system for a drive motor of an electric vehicle, characterized in that, include: First power supply; The first power supply circuit, which is electrically connected to the first power supply, is used to supply power to the system base chip SBC and to supply power to the upper and lower bridges of the drive motor. Second power supply; A second power supply circuit electrically connected to the second power supply is used to supply power to the lower bridge of the drive motor; the supply voltage of the second power supply is higher than the supply voltage of the first power supply. When the first power supply circuit fails, the second power supply circuit supplies power to the lower bridge of the drive motor, causing the drive motor to enter a short circuit state. When the second power supply circuit fails, the upper bridge of the drive motor is powered through the first power supply circuit, causing the drive motor to enter a short circuit state. The first power supply circuit includes: A first filter electrically connected to the first power supply is used to filter the first voltage provided by the first power supply to obtain a first target voltage; The system base chip SBC power supply, which is electrically connected to the first filter, is used to provide the first target voltage to the system base chip SBC. A first conversion power supply electrically connected to the first filter is used to convert the first target voltage into the upper bridge power supply voltage and the lower bridge power supply voltage of the drive motor; The upper bridge power supply, which is electrically connected to the first conversion power supply, is used to provide the upper bridge power supply voltage to the upper bridge. The lower bridge power supply, which is electrically connected to the first conversion power supply, is used to provide the lower bridge power supply voltage to the lower bridge. The first conversion power supply includes: a first transistor switch (Q1), a second transistor switch (Q2), a first transformer (T7), a first diode (D4), a second diode (D5), a first capacitor (C1), a second capacitor (C2), and a third capacitor (C3); The gate of the first transistor switch (Q1) is electrically connected to the microprocessor unit (MCU), the source is input with the first target voltage, and the drain is electrically connected to the first terminal of the first transformer (T7). The gate of the second transistor switch (Q2) is electrically connected to the microprocessor unit (MCU), the source is input with the first target voltage, and the drain is electrically connected to the second terminal of the first transformer (T7). The third terminal of the first transformer (T7) is electrically connected to the input terminal of the first diode (D4), and the fourth terminal of the first transformer (T7) is electrically connected to the output terminal of the second diode (D5). The first diode (D4) is electrically connected to the second diode (D5) through the second capacitor (C2) and the third capacitor (C3); The first capacitor (C1) is connected between the positive and negative terminals of the first target voltage, and both the first transistor switch (Q1) and the second transistor switch (Q2) are N-type metal-oxide transistors. The second power supply circuit includes: The second filter, which is electrically connected to the second power supply, is used to filter the second voltage provided by the second power supply to obtain the second target voltage; The second conversion power supply, electrically connected to the second filter, is used to convert the second target voltage into the lower bridge power supply voltage of the drive motor, and to provide the lower bridge power supply voltage to the lower bridge; the second conversion power supply is used to convert 60V~500V to 15V; The second conversion power supply includes: a sixth capacitor (C6), a second transformer (T8), a fifth transistor switch (Q5), a clamping diode (D6), an input diode (D7), a seventh capacitor (C7), and a drive circuit (IC1). The sixth capacitor (C6) is electrically connected to the second power supply. One side of the second transformer (T8) is electrically connected to the second power supply and is connected in parallel with the clamping diode (D6), while the other side is connected in parallel with the seventh capacitor (C7) through the input diode (D7). The second transformer (T8) is electrically connected to the drive circuit (IC1) through the fifth transistor switch (Q5) and a resistor (R1).

2. The power supply system for the drive motor of an electric vehicle according to claim 1, characterized in that, The power supply for the system's basic chip SBC includes: Digital component power supply, used to power the data components of the microprocessor unit (MCU); Analog component power supply, used to power the analog components of the microprocessor unit (MCU); The Controller Area Network (CAN) power supply provides power for CAN communication within the CAN network.

3. The power supply system for the drive motor of an electric vehicle according to claim 1, characterized in that, A control circuit is also connected between the upper bridge power supply and the lower bridge power supply to control the lower bridge power supply to provide the lower bridge power supply voltage.

4. The power supply system for the drive motor of an electric vehicle according to claim 3, characterized in that, The control circuit includes a third transistor switch (Q3) and a fourth transistor switch (Q4). The source of the third transistor switch (Q3) is electrically connected to the output terminal of the first conversion power supply; The drain of the fourth transistor switch (Q4) is electrically connected to the input terminal of the lower bridge power supply. The gate of the third transistor switch (Q3) is electrically connected to the source of the fourth transistor switch (Q4). The third transistor switch (Q3) is a P-type metal-oxide transistor, and the fourth transistor switch (Q4) is an N-type metal-oxide transistor.

5. The power supply system for the drive motor of an electric vehicle according to claim 1, characterized in that, The second filter includes: The fuse FUSE is electrically connected to the second power supply. A first inductor (L4) is connected in series with the fuse FUSE, and the first inductor (L4) is grounded through a fourth capacitor (C4); A second inductor (L5) is connected in series with the first inductor (L4), and the second inductor (L5) is grounded through a fifth capacitor (C5).

6. An electric vehicle, characterized in that, The power supply system includes the drive motor as described in any one of claims 1 to 5.

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