Driving power supply circuit and vehicle

Abstract

The utility model discloses a driving power supply circuit and a vehicle, the driving power supply circuit comprises a push-pull circuit, the input end of the push-pull circuit is suitable for inputting a PWM signal, the power supply end is suitable for being connected with a first power supply end, and the push-pull circuit is used for converting a first direct current of the first power supply end into a first direct current square wave according to the PWM signal; and the first capacitor is connected to the output end of the push-pull circuit and is used for converting the first direct-current square wave into an alternating-current square wave.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, and more specifically, to a driving power supply circuit and a vehicle. Background Art

[0002] With the continuous updating and rapid development of power electronics technology, the expanding advantages of new energy technology, and the miniaturization, high frequency, and high reliability of semiconductor devices, high-frequency power electronics products have penetrated into various fields; the industry's requirements for the power density of power electronics products are also getting higher and higher.

[0003] In the prior art, a variety of power semiconductor devices may be used in the circuit to achieve high power density at a lower cost. However, different types of power semiconductor devices have different requirements for driving power supplies, and different types of devices also require different voltage levels, which makes the design of driving power supply circuits very difficult. Utility Model Content

[0004] One object of the utility model is to provide a driving power supply circuit and a vehicle.

[0005] According to one aspect of the utility model, a driving power supply circuit is provided, comprising:

[0006] A push-pull circuit, wherein the input end of the push-pull circuit is suitable for inputting a PWM signal, the power end of the push-pull circuit is suitable for connecting to a first power end, and the push-pull circuit is used to convert a first direct current of the first power end into a first direct current square wave according to the PWM signal;

[0007] A first capacitor is connected to the output end of the push-pull circuit and is used for converting the first DC square wave into an AC square wave.

[0008] Optionally, a first end of the first capacitor is connected to an output end of the push-pull circuit, and a second end of the first capacitor is connected to a ground end of the push-pull circuit.

[0009] Optionally, a transformer is further included, wherein a first end of a primary winding of the transformer is connected to a second end of the first capacitor, and a second end of the primary winding of the transformer is connected to a ground terminal of the push-pull circuit;

[0010] The secondary winding of the transformer is used to output an amplified AC square wave.

[0011] Optionally, a first resistor is further provided between the second end of the primary winding of the transformer and the ground terminal of the push-pull circuit.

[0012] Optionally, it further includes a second capacitor, wherein a first end of the second capacitor is connected to a first end of the secondary winding of the transformer, and a second end of the second capacitor is connected to the first output end;

[0013] The second capacitor is used to convert the amplified AC square wave into a second DC square wave.

[0014] Optionally, a rectifier circuit is further included, wherein a first input end of the rectifier circuit is connected to the second end of the second capacitor, and a second input end of the rectifier circuit is connected to the second end of the secondary winding of the transformer;

[0015] The rectifier circuit is used for converting the second DC square wave into a second DC power.

[0016] Optionally, the rectifier circuit includes a first diode, a second diode and a third capacitor, the anode of the first diode is connected to the second end of the second capacitor, the cathode of the first diode is connected to the first output end, the anode of the second diode is connected to the second end of the secondary winding of the transformer and the second output end, and the cathode of the second diode is connected to the second end of the second capacitor; the first end of the third capacitor is connected to the first output end, and the second end of the third capacitor is connected to the second output end.

[0017] Optionally, the rectifier circuit also includes a Zener diode, a second resistor and a fourth capacitor, the anode of the Zener diode is connected to the first end of the second resistor, the cathode of the Zener diode is connected to the first output end, and the second end of the second resistor is connected to the second output end; the first end of the fourth capacitor is connected to the second end of the third capacitor and the anode of the Zener diode, and the second end of the fourth capacitor is connected to the second output end.

[0018] Optionally, the driving power supply circuit includes a plurality of the push-pull circuits, a transformer corresponding one-to-one to each push-pull circuit, and a first capacitor corresponding one-to-one to each transformer, the first end of the primary winding of each transformer is connected to the output end of the corresponding push-pull circuit through the corresponding first capacitor, and the second end of the primary winding of each transformer is connected to the ground end of the corresponding push-pull circuit.

[0019] Optionally, the driving power supply circuit includes multiple transformers and a first capacitor corresponding to each transformer, the first ends of the primary windings of the multiple transformers are connected to the output end of the same push-pull circuit through the corresponding first capacitors, and the second end of the primary winding of each transformer is connected to the ground end of the same push-pull circuit.

[0020] Optionally, the driving circuit includes a processor and a first operational amplifier, the first terminal of the processor is connected to the non-inverting input terminal of the first operational amplifier, the inverting input terminal of the first operational amplifier is connected to the second power supply terminal of the driving power supply circuit, and the output terminal of the first operational amplifier is connected to the input terminal of the push-pull circuit;

[0021] The processor is configured to output a PWM signal;

[0022] The first operational amplifier is configured to amplify the PWM signal and then output the amplified signal to the push-pull circuit.

[0023] According to a second aspect of the utility model, a vehicle is provided, comprising the driving power supply circuit as described in the first aspect of the utility model.

[0024] Through the drive power supply circuit of this embodiment, the complementary push-pull structure + DC blocking capacitor design is adopted, so that the transformer can work in quadrants I and III. Compared with the existing technology, the utilization rate of the transformer's magnetic core is high; and the output voltage is adjustable, which can adapt to the demand of different types of power semiconductor devices for drive power supply and the required voltage level between different types of devices. In addition, the drive power supply circuit of this embodiment is small in size and easy to implement.

[0025] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0027] Figure 1 It is a principle block diagram of a driving power supply circuit according to an embodiment of the utility model;

[0028] Figure 2 It is a principle block diagram of a driving power supply circuit according to an embodiment of the utility model;

[0029] Figure 3 is a circuit schematic diagram of a driving power supply circuit according to an embodiment of the utility model;

[0030] Figure 4 is a circuit schematic diagram of a driving power supply circuit according to an embodiment of the utility model;

[0031] Figure 5 is a circuit schematic diagram of a driving power supply circuit according to an embodiment of the utility model;

[0032] Figure 6 It is a circuit principle diagram of a driving power supply circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0035] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] The present disclosure provides a driving power supply circuit. Figure 1 The figure is a principle block diagram of a driving power supply circuit according to an embodiment of the utility model.

[0039] according to Figure 1 As shown, the driving power supply circuit 1000 may include a push-pull circuit 1100 and a first capacitor C1. The input end of the push-pull circuit 1100 is suitable for inputting a PWM signal, and the power supply end is suitable for connecting to a first power supply end VCC1. The push-pull circuit 1100 is used to convert the first direct current of the first power supply end VCC into a first direct current square wave according to the PWM signal.

[0040] The first capacitor C1 is connected to the output end of the push-pull circuit 1100 and is used to convert the first DC square wave into an AC square wave.

[0041] The push-pull circuit 1100 is an output circuit connected between two transistors of different polarities. The push-pull circuit 1100 uses two power BJT tubes (bipolar junction transistor) or MOSFET tubes with the same parameters, which exist in the circuit in a push-pull manner, each responsible for the waveform amplification task of the positive and negative half cycles. When the circuit is working, only one of the two symmetrical power switch tubes is turned on at a time, so the conduction loss is small and the efficiency is high. The push-pull output can both inject current into the load and extract current from the load.

[0042] In an example, Figure 3 to Figure 6 As shown, the push-pull circuit 1100 may include an NPN transistor Q1 and a PNP transistor Q2, the base of the NPN transistor Q1 and the base of the PNP transistor Q2 are both connected to the output end of the driving circuit 1100, the collector of the NPN transistor Q1 is connected to the first power supply end VCC1, the emitter of the NPN transistor Q1 is connected to the emitter of the PNP transistor Q2, and the collector of the PNP transistor Q2 is connected to the ground end GND.

[0043] On this basis, if Figure 3 to Figure 6 As shown, the driving power supply circuit 1000 may also include a third resistor R3 and a fourth resistor R4, wherein the first end of the third resistor R3 is connected to the output end of the driving circuit 1100, the second end of the third resistor R3 is connected to the base of the NPN transistor Q1, the first end of the fourth resistor R4 is connected to the output end of the driving circuit 1100, and the second end of the fourth resistor R4 is connected to the base of the PNP transistor Q2.

[0044] In another example, the push-pull circuit 1100 may include an NMOS tube and a PMOS tube, the gate of the NMOS tube and the gate of the PMOS tube are both connected to the output end of the driving circuit 1100, the source of the PMOS tube is connected to the first power supply terminal VCC1, the drain of the PMOS tube is connected to the drain of the NMOS tube, and the source of the NMOS tube is connected to the ground terminal GND.

[0045] In this embodiment, the push-pull circuit is driven by the PWM signal, and the first DC power of the first power supply terminal VCC is converted into a first DC square wave. The first DC square wave is converted into an AC square wave after passing through the first capacitor C1.

[0046] The driving power supply circuit of this embodiment can convert the first direct current provided by the first power supply terminal into an alternating square wave. In addition, the driving power supply circuit of this embodiment has a small size and is easy to implement.

[0047] In one embodiment of the present disclosure, Figure 2 As shown, a first end of the first capacitor C1 is connected to the output end of the push-pull circuit 1100 , and a second end of the first capacitor C1 is connected to the ground end GND of the push-pull circuit 1100 .

[0048] In one embodiment of the present disclosure, Figure 2 As shown, the driving power supply circuit 1000 may include a transformer 1200 , a first end of the primary winding of the transformer 1200 is connected to the second end of the first capacitor C1 , and a second end of the primary winding of the transformer 1200 is connected to the ground terminal GND of the push-pull circuit 1100 .

[0049] The secondary winding of the transformer 1200 is used to output an amplified AC square wave.

[0050] In this embodiment, the push-pull circuit is driven by the PWM signal, and the first direct current of the first power supply terminal VCC is converted into a first direct current square wave. The first direct current square wave is converted into an alternating current square wave after passing through the first capacitor C1. The alternating current square wave is input into the primary winding of the transformer 1200, and the alternating current square wave can make the transformer 1200 work in quadrants I and III, and the secondary winding of the transformer 1200 outputs an amplified alternating current square wave.

[0051] In one embodiment of the present disclosure, Figure 2 As shown, the driving power supply circuit 1000 may further include a second capacitor C2, a first end of the second capacitor C2 is connected to a first end of the secondary winding of the transformer 1200, and a second end of the second capacitor C2 is connected to the first output end VDD1.

[0052] The second capacitor C2 is used to convert the amplified AC square wave into a second DC square wave.

[0053] In one embodiment of the present disclosure, Figure 2 As shown, the driving power supply circuit 1000 may further include a rectifier circuit 1300 , wherein the input end of the rectifier circuit 1300 is connected to the second end of the second capacitor C2 , and the second input end of the rectifier circuit 1300 is connected to the second end of the secondary winding of the transformer 1200 .

[0054] The rectifier circuit 1300 is used to convert the second DC square wave into a second DC power.

[0055] In an example, the rectifier circuit 1300 may adopt a half-wave rectification method or a full-bridge rectification method to convert the second DC square wave into the second DC power.

[0056] Through this embodiment, the first direct current provided by the first power supply terminal can be converted into a second direct current for powering the driver chip of the power semiconductor device, and the voltage of the second direct current is adjustable. In addition, the drive power supply circuit of this embodiment is small in size and easy to implement.

[0057] In one embodiment of the present disclosure, Figure 3-4 As shown, the rectifier circuit 1300 includes a first diode D1, a second diode D2 and a third capacitor C3, the anode of the first diode D1 is connected to the second end of the second capacitor C2, the cathode of the first diode D1 is connected to the first output terminal VDD1, the anode of the second diode D2 is connected to the second output terminal VSS1, the cathode of the second diode D2 is connected to the second end of the second capacitor C2, the first end of the third capacitor C3 is connected to the first output terminal VDD1, and the second end of the third capacitor C3 is connected to the second output terminal VSS1.

[0058] In an example, the voltage of the first output terminal VDD1 is a positive voltage, and the voltage of the second output terminal VSS1 may be zero or a negative voltage.

[0059] The voltage value between the first output terminal VDD1 and the second output terminal VSS1 may be related to the voltage of the first direct current of the first power terminal VCC1 , the duty cycle of the PWM signal, and the turns ratio of the transformer 1200 .

[0060] In this embodiment, when the second DC square wave is at a high level, the second DC square wave charges the third capacitor C3 through the first diode D1, and when the second DC square wave is at a low level, the fourth square wave signal charges the second capacitor C2 through the second diode D2.

[0061] Through the rectifier circuit of this embodiment, the voltage output by the first output terminal VDD1 is a positive voltage, and the voltage output by the second output terminal VSS1 is zero, which can power the driving chips of the Si-MOS tube and GaN-MOS tube of the A, B, C, and N three-phase bridge arms and the chopper bridge arm in the power factor correction circuit.

[0062] In one embodiment of the present disclosure, Figure 5-6 As shown, the rectifier circuit 1300 may also include a Zener diode D3, a second resistor R2 and a fourth capacitor C4, the anode of the Zener diode D3 is connected to the first end of the second resistor R2, the cathode of the Zener diode D3 is connected to the first output terminal VDD1, the second end of the second resistor R2 is connected to the second output terminal VSS1, the first end of the fourth capacitor C4 is connected to the second end of the third capacitor C3 and the anode of the Zener diode D3, and the second end of the fourth capacitor C4 is connected to the second output terminal VSS1.

[0063] In this embodiment, when the second DC square wave is at a high level, the second DC square wave charges the third capacitor and the fourth capacitor C4 through the first diode D1, and when the second DC square wave is at a low level, the fourth square wave signal charges the second capacitor C2 through the second diode D2. Through the potential point S1 between the voltage stabilizing diode D3 and the second resistor R2, the voltage between the first output terminal VDD1 and the second output terminal VSS1 can be divided into a positive voltage and a negative voltage. The voltage between the first output terminal VDD1 and the potential point S1 is determined by the voltage stabilizing value of the voltage stabilizing diode D3, and the second resistor R2 provides a loop for the voltage stabilizing current of the voltage stabilizing diode D3.

[0064] Through the rectifier circuit of this embodiment, the voltage output by the first output terminal VDD1 is a positive voltage, and the voltage output by the second output terminal VSS1 is a negative voltage, which can power the SiC-MOS and IGBT (Insulated Gate Bipolar Transistor) driving chips of the A, B, C, and N three-phase bridge arms and the chopper bridge arm in the inverter circuit.

[0065] In one embodiment of the present disclosure, the driving power supply circuit 1000 may include multiple push-pull circuits 1100, a transformer 1200 corresponding one-to-one to each push-pull circuit 1100, and a first capacitor C1 corresponding one-to-one to each transformer 1200, the first end of the primary winding of each transformer 1200 is connected to the output end of the corresponding push-pull circuit 1100 through the corresponding first capacitor C1, and the second end of the primary winding of each transformer 1200 is connected to the ground terminal GND of the corresponding push-pull circuit 1100.

[0066] In another embodiment of the present disclosure, the driving power supply circuit 1000 may include multiple transformers 1200 and a first capacitor C1 corresponding to each transformer 1200. The first ends of the primary windings of the multiple transformers 1200 are connected to the output end of the same push-pull circuit 1100 through the corresponding first capacitor C1, and the second ends of the primary windings of the multiple transformers 1200 are connected to the ground terminal GND of the same push-pull circuit 1100.

[0067] In the case where the driving power supply circuit 1000 includes a plurality of transformers 1200 , the driving power supply circuit 1000 may include a second capacitor corresponding to each transformer on a one-to-one basis and a rectifier circuit corresponding to each transformer on a one-to-one basis.

[0068] Through this embodiment, multiple mutually isolated second direct currents can be provided to respectively power the driver chips of the power semiconductor devices in the multiple bridge arms.

[0069] In one embodiment of the present disclosure, Figure 2As shown, the driving circuit 1100 also includes a processor 1400 and a first operational amplifier 1500, the first end of the processor 1400 is connected to the non-inverting input end of the first operational amplifier 1500, the inverting input end of the first operational amplifier 1500 is connected to the second power supply end VCC2 of the driving power supply circuit 1000, and the output end of the first operational amplifier 1500 is connected to the input end of the push-pull circuit 1200.

[0070] The processor 1400 is configured to output a PWM signal.

[0071] The first operational amplifier 1500 is configured to amplify the PWM signal and then output the amplified signal to the push-pull circuit 1100 .

[0072] In this embodiment, the processor 1400 may output the second square wave signal through an IO pin. The high level of the PWM signal output by the processor 1400 is usually 3.3V, which cannot drive the push-pull circuit 1100. Therefore, the PWM signal may be amplified by the first operational amplifier 1500 to drive the push-pull circuit 1100.

[0073] Further, the level of the second power supply terminal VCC2 is lower than the high level of the PWM signal. For example, the level of the second power supply terminal VCC2 may be 1.5V.

[0074] In this embodiment, a first square wave signal can be output to drive the push-pull circuit through an IO pin of the processor and the first operational amplifier, which can reduce the use of IO pins in the processor and reduce costs.

[0075] In one embodiment of the present disclosure, a first resistor R1 is further provided between the first end of the primary winding of the transformer 1200 and the ground terminal GND of the push-pull circuit 1100 .

[0076] In one embodiment of the present disclosure, Figure 3 to Figure 6 As shown, the driving power supply circuit 1000 further includes a second operational amplifier 1700, a non-inverting input terminal of the second operational amplifier 1700 is connected to the first end of the first resistor R1, an inverting input terminal of the second operational amplifier 1700 is connected to the second end of the first resistor R1, and an output terminal of the second operational amplifier 1700 is connected to a third terminal of the processor 1400. The second operational amplifier 1700 is configured to output a second sampling signal representing the current of the primary side of the input transformer T1 to the processor 1400 according to the voltage across the first resistor R1.

[0077] The processor 1400 is further configured to adjust the duty cycle of the PWM signal according to the second sampling signal.

[0078] In this embodiment, the current inputted from the primary side of the transformer T1 is sampled by the first resistor, and the current is converted into a voltage, and the voltage is amplified by the second operational amplifier to obtain a second sampling signal, and the second sampling signal is transmitted to the processor 1400, so that the processor 1400 can adjust the duty cycle of the PWM signal according to the second sampling signal, and then adjust the voltage between the first output terminal VDD1 and the second output terminal VSS1 connected to each transformer. The processor can complete the control of the voltage between the first output terminal VDD1 and the second output terminal VSS1 connected to each transformer through only one ADC pin and one IO pin, and there is no isolation requirement for the sampling signal, the control method is simple, and the use of pins in the processor can be reduced, thereby reducing costs.

[0079] It can be understood that the driving power supply circuit 1000 may include a voltage sampling circuit 1600, excluding the first resistor R1 and the second operational amplifier 1700, or the driving power supply circuit 1000 may not include the voltage sampling circuit 1600, include the first resistor R1 and the second operational amplifier 1700, or the driving power supply circuit 1000 may include the voltage sampling circuit 1600, the first resistor R1 and the second operational amplifier 1700.

[0080] Furthermore, in an embodiment where the driving power supply circuit 1000 includes a first resistor R1 and a second operational amplifier 1700, when the driving power supply circuit 1000 includes multiple transformers, the driving power supply circuit 1000 may include a second operational amplifier 1700 corresponding to each transformer one by one, so as to sample the input current of each transformer.

[0081] In this embodiment, the driving power supply circuit can be placed near the power semiconductor device. Since there is no safety avoidance problem between the primary signal of the transformer and the controller, the power density of the circuit board of the driving power supply circuit can be improved.

[0082] In one embodiment of the present disclosure, Figure 3 to Figure 6 As shown, the driving power supply circuit 1000 further includes a voltage sampling circuit 1600 , an input end of the voltage sampling circuit 1600 is connected to the first power supply end VCC1 , and an output end of the voltage sampling circuit 1600 is connected to the second end of the processor 1110 .

[0083] The voltage sampling circuit 1600 is configured to sample the voltage of the first power supply terminal VCC to obtain a first sampling signal, and transmit the first sampling signal to the processor 1400 .

[0084] The processor 1400 is configured to adjust the duty cycle of the PWM signal according to the first sampling signal.

[0085] The voltage sampling circuit 1600 in this embodiment may include a fifth resistor and a sixth resistor connected in series between the first power supply terminal VCC1 and the ground terminal GND, and the potential point between the fifth resistor and the sixth resistor may be connected to the second terminal of the processor 1400 .

[0086] The processor adjusts the duty cycle of the PWM signal according to the voltage of the first power supply terminal VCC1, and further adjusts the voltage between the first output terminal VDD1 and the second output terminal VSS1 connected to each transformer. The processor can complete the control of the voltage between the first output terminal VDD1 and the second output terminal VSS1 in each power supply output circuit 1300 through only one ADC pin and one IO pin, and there is no isolation requirement for the sampling signal, the control method is simple, and the use of pins in the processor can be reduced, thereby reducing costs.

[0087] The present disclosure also provides a vehicle, which includes the driving power supply circuit 1000 as described in any of the aforementioned embodiments.

[0088] The above embodiments mainly focus on describing the differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.

[0089] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A driving power supply circuit, characterized in that: include: A push-pull circuit, wherein the input end of the push-pull circuit is suitable for inputting a PWM signal, the power end of the push-pull circuit is suitable for connecting to a first power end, and the push-pull circuit is used to convert a first direct current of the first power end into a first direct current square wave according to the PWM signal; A first capacitor is connected to the output end of the push-pull circuit and is used for converting the first DC square wave into an AC square wave.

2. The driving power supply circuit according to claim 1, characterized in that: A first end of the first capacitor is connected to the output end of the push-pull circuit, and a second end of the first capacitor is connected to the ground end of the push-pull circuit.

3. The driving power supply circuit according to claim 2, characterized in that: It also includes a transformer, wherein a first end of a primary winding of the transformer is connected to a second end of the first capacitor, and a second end of the primary winding of the transformer is connected to a ground terminal of the push-pull circuit; The secondary winding of the transformer is used to output an amplified AC square wave.

4. The driving power supply circuit according to claim 3, characterized in that: A first resistor is further provided between the second end of the primary winding of the transformer and the grounding end of the push-pull circuit.

5. The driving power supply circuit according to claim 3, characterized in that: It also includes a second capacitor, wherein a first end of the second capacitor is connected to a first end of the secondary winding of the transformer, and a second end of the second capacitor is connected to the first output end; The second capacitor is used to convert the amplified AC square wave into a second DC square wave.

6. The driving power supply circuit according to claim 5, characterized in that: It also includes a rectifier circuit, wherein a first input end of the rectifier circuit is connected to a second end of the second capacitor, and a second input end of the rectifier circuit is connected to a second end of the secondary winding of the transformer; The rectifier circuit is used for converting the second DC square wave into a second DC power.

7. The driving power supply circuit according to claim 6, characterized in that: The rectifier circuit includes a first diode, a second diode and a third capacitor, the anode of the first diode is connected to the second end of the second capacitor, the cathode of the first diode is connected to the first output end, the anode of the second diode is connected to the second end of the secondary winding of the transformer and the second output end, and the cathode of the second diode is connected to the second end of the second capacitor; the first end of the third capacitor is connected to the first output end, and the second end of the third capacitor is connected to the second output end.

8. The driving power supply circuit according to claim 7, characterized in that: The rectifier circuit also includes a Zener diode, a second resistor and a fourth capacitor, the anode of the Zener diode is connected to the first end of the second resistor, the cathode of the Zener diode is connected to the first output end, and the second end of the second resistor is connected to the second output end; the first end of the fourth capacitor is connected to the second end of the third capacitor and the anode of the Zener diode, and the second end of the fourth capacitor is connected to the second output end.

9. The driving power supply circuit according to claim 6, characterized in that: The driving power supply circuit includes multiple push-pull circuits, a transformer corresponding to each push-pull circuit, and a first capacitor corresponding to each transformer. The first end of the primary winding of each transformer is connected to the output end of the corresponding push-pull circuit through the corresponding first capacitor, and the second end of the primary winding of each transformer is connected to the ground end of the corresponding push-pull circuit.

10. The driving power supply circuit according to claim 6, characterized in that: The driving power supply circuit includes multiple transformers and a first capacitor corresponding to each transformer. The first ends of the primary windings of the multiple transformers are connected to the output end of the same push-pull circuit through the corresponding first capacitors, and the second end of the primary winding of each transformer is connected to the ground end of the same push-pull circuit.

11. The driving power supply circuit according to any one of claims 1 to 10, characterized in that: The driving power supply circuit includes a processor and a first operational amplifier, wherein the first terminal of the processor is connected to the non-inverting input terminal of the first operational amplifier, the inverting input terminal of the first operational amplifier is connected to the second power supply terminal of the driving power supply circuit, and the output terminal of the first operational amplifier is connected to the input terminal of the push-pull circuit; The processor is configured to output a PWM signal; The first operational amplifier is configured to amplify the PWM signal and then output the amplified signal to the push-pull circuit.

12. A vehicle, characterized in that: The invention comprises the driving power supply circuit as claimed in any one of claims 1 to 11.

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