Power supply circuit, motor controller and electric vehicle

Abstract

The utility model discloses a power supply circuit, a motor controller and an electric vehicle. The power supply circuit includes: a bus; the starting circuit is electrically connected with the bus; the power supply circuit is electrically connected with the starting circuit, and the flyback switching power supply is electrically connected with the bus and the power supply circuit respectively; wherein the starting circuit generates an intermediate voltage signal when accessing a high-voltage signal from a bus; the power supply circuit is started to work based on the intermediate voltage signal; the power supply circuit controls the flyback switching power supply to carry out voltage reduction processing on a high-voltage signal accessed from a bus in a working state, and outputs a low-voltage signal; wherein the voltage of the intermediate voltage signal is smaller than that of the high voltage signal. In this way, the integration level of the circuit can be improved, the cost can be reduced, and the power consumption of the circuit can be reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic control technology, and in particular to a power supply circuit, a motor controller and an electric vehicle. Background Art

[0002] As the core component of electric vehicles, the motor controller has increasingly higher performance requirements, and the power supply circuit in the motor controller plays a vital role in improving its performance.

[0003] In related technologies, a high-voltage battery pack is used to power on the power circuit, but this circuit structure requires a large number of high-voltage power devices, a large circuit board area is required, and the circuit cost is high; or a resistor voltage divider is used to obtain power, but this circuit structure consumes large power and generates severe heat. Utility Model Content

[0004] The present application provides a power supply circuit, a motor, and an electric vehicle to improve circuit integration, reduce costs, and reduce circuit power consumption.

[0005] The present application proposes a power supply circuit. The power supply circuit includes: a bus; a startup circuit electrically connected to the bus; a power supply circuit electrically connected to the startup circuit; and a flyback switching power supply electrically connected to the bus and the power supply circuit, respectively. The startup circuit generates an intermediate voltage signal when receiving a high-voltage signal from the bus; the power supply circuit starts operating based on the intermediate voltage signal; and when in operation, the power supply circuit controls the flyback switching power supply to step down the high-voltage signal received from the bus and output a low-voltage signal. The intermediate voltage signal has a voltage lower than that of the high-voltage signal.

[0006] In some embodiments, the startup circuit includes: a first switching tube, a first communication end of the first switching tube is connected to the intermediate voltage signal, a control end of the first switching tube is electrically connected to the bus, and a second communication end of the first switching tube is electrically connected to the power supply circuit; wherein, the control end of the first switching tube is turned on after obtaining the high-voltage signal from the bus, and transmits the intermediate voltage signal connected to the first communication end to the power supply circuit.

[0007] In some embodiments, the flyback switching power supply is provided with a high-voltage side input terminal, a high-voltage side feedback terminal and a low-voltage side output terminal, the high-voltage side input terminal is electrically connected to the bus, the high-voltage side feedback terminal is electrically connected to the power supply circuit to supply power to the power supply circuit in the working state; the low-voltage side output terminal of the flyback switching power supply outputs the low-voltage signal.

[0008] In some embodiments, the startup circuit further includes: a second switch tube, a first communication end of the second switch tube is electrically connected to the bus, a control end of the second switch tube is electrically connected to the power supply circuit and the high-voltage side feedback end respectively, and a second communication end of the second switch tube is grounded; wherein, the control end of the second switch tube obtains a feedback voltage signal from the high-voltage side feedback end and is turned on to compete with the high-voltage side feedback end to supply power to the power supply circuit.

[0009] In some embodiments, the power supply circuit further includes: a voltage stabilizing circuit, electrically connected to the startup circuit and the power supply circuit respectively, and at least used to stabilize the intermediate voltage signal and then supply it to the power supply circuit.

[0010] In some embodiments, the power supply circuit also includes: an isolation amplifier, electrically connected to the power supply circuit and the low-voltage side output end, respectively, for feeding back the low-voltage signal output from the low-voltage side output end to the power supply circuit, so that the power supply circuit adjusts the control of the flyback switching power supply based on the low-voltage signal.

[0011] In some embodiments, the power supply circuit further includes: a low-voltage battery electrically connected to the low-voltage side output end, and the low-voltage side output end charges the low-voltage battery or competes with the low-voltage battery to supply power to the load.

[0012] In some embodiments, the power supply circuit further includes: a voltage conversion circuit electrically connected to the low-voltage side output end, and the voltage conversion circuit changes the voltage of the low-voltage signal output by the low-voltage side output end and supplies it to the load.

[0013] The present application provides a motor controller, which includes: the power supply circuit described above; and a drive circuit connected to the power supply circuit.

[0014] The present application provides an electric vehicle, which includes the power supply circuit or the motor controller.

[0015] The beneficial effect of the technical solution of the present application is that the power supply circuit of the present application includes a bus, a starting circuit, a power supply circuit and a flyback switching power supply; the starting circuit is electrically connected to the bus; the power supply circuit is electrically connected to the starting circuit, and the flyback switching power supply is electrically connected to the bus and the power supply circuit respectively; wherein, when the starting circuit receives a high-voltage signal from the bus, it generates an intermediate voltage signal; the power supply circuit starts working based on the intermediate voltage signal; when the power supply circuit is in working state, it controls the flyback switching power supply to step down the high-voltage signal received from the bus and output a low-voltage signal; the voltage of the intermediate voltage signal is lower than the voltage of the high-voltage signal. In this way, when the high-voltage signal is received, the starting circuit generates an intermediate voltage signal with a voltage lower than the high-voltage signal, and uses the intermediate voltage signal to start the power supply circuit; therefore, compared with the existing method of using a high-voltage battery pack to start the power supply circuit, the present application uses a smaller intermediate voltage signal to start the power supply circuit, and does not require a large number of high-voltage-resistant power devices in the power supply circuit, which can improve the circuit integration and reduce costs; and compared with the existing method of using resistor voltage divider to obtain power, it can reduce circuit power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0017] Figure 1 It is a structural diagram of the power supply circuit of this application;

[0018] Figure 2 This is a schematic diagram of the circuit structure of the busbar and starting circuit in the power supply circuit of this application;

[0019] Figure 3 It is a circuit structure diagram of the power supply circuit of the present application;

[0020] Figure 4 This is a schematic diagram of the circuit structure of the motor controller of this application. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only intended to illustrate the present application and are not intended to limit the scope of the present application. Similarly, the following examples are only some examples of the present application and not all examples. All other examples obtained by those of ordinary skill in the art without creative work are intended to fall within the scope of protection of this application.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0025] As the core component of electric vehicles, the motor controller has increasingly higher performance requirements, and the power supply circuit in the motor controller plays a vital role in improving its performance.

[0026] In related technologies, a high-voltage battery pack is used to power on the power circuit, but this circuit structure requires a large number of high-voltage power devices, a large circuit board area is required, and the circuit cost is high; or a resistor voltage divider is used to obtain power, but this circuit structure consumes large power and generates severe heat.

[0027] To this end, the present application proposes a power supply circuit, such as Figure 1 As shown, Figure 11 is a schematic diagram of the structure of an embodiment of the power supply circuit of the present application. The power supply circuit 10 of this embodiment includes: a bus 20, a startup circuit 30, a power supply circuit 40, and a flyback switching power supply 50; the startup circuit 30 is electrically connected to the bus 20; the power supply circuit 40 is electrically connected to the startup circuit 30, and the flyback switching power supply 50 is electrically connected to the bus 20 and the power supply circuit 40, respectively; wherein, when the startup circuit 30 receives a high-voltage signal from the bus 20, it generates an intermediate voltage signal; the power supply circuit 40 starts operation based on the intermediate voltage signal; when the power supply circuit 40 is in operation, it controls the flyback switching power supply 50 to step down the high-voltage signal received from the bus 20 and output a low-voltage signal; wherein, the voltage of the intermediate voltage signal is lower than that of the high-voltage signal.

[0028] Among them, after the bus 20 is connected to the high-voltage signal, it provides a high-voltage signal to the starting circuit 30 and the bus 20; when the starting circuit 30 is connected to the high-voltage signal, it generates an intermediate voltage signal whose voltage is lower than the high-voltage signal, and supplies the intermediate voltage signal to the power circuit 40 to realize power supply to the power circuit 40; after the power circuit 40 is powered by the intermediate voltage signal, it is powered on and started to enter the working state, and in the working state, it controls the flyback switching power supply 50 to step down the high-voltage signal connected from the bus 20 and output a low-voltage signal, which is used to power the load.

[0029] When a high-voltage signal is connected, the starting circuit 30 generates an intermediate voltage signal whose voltage is lower than the high-voltage signal, and uses the intermediate voltage signal to start the power circuit 40; therefore, compared with the existing method of using a high-voltage battery pack to start the power circuit 40, this embodiment uses an intermediate voltage signal with a smaller voltage to start the power circuit 40. There is no need to set up a large number of high-voltage-resistant power devices in the power supply circuit 10, which can improve the circuit integration and reduce costs; and compared with the existing method of using resistor voltage division to obtain power, it can reduce the circuit power consumption.

[0030] In some embodiments, the bus 20 may be a high-voltage DC bus, and the high-voltage signal may be a DC signal. Of course, in other embodiments, the type of bus or the type of electrical signal transmitted thereon may be adjusted according to the specific internal circuit structure of the power supply circuit 10 .

[0031] In some embodiments, the power supply circuit 40 may include a power supply chip or a non-integrated power supply circuit. The power supply chip may include a chip related to power management. It may include a power control chip, a power management chip, etc., and its main functions may include power conversion, management, and protection. The power supply chip may be, for example, UCC28C43-Q1.

[0032] In some embodiments, as Figure 3As shown, the flyback switching power supply 50 includes components such as a switch Q3, a transformer T, a rectifier diode D3, and a filter capacitor C2. When the switch Q3 is on, the primary coil (high-voltage side) of the high-frequency transformer T is excited by the DC pulse voltage, and the secondary coil (low-voltage side) does not provide power to the load. When the switch Q3 is off, the secondary coil begins to provide power to the load. This operating mode allows the transformer T to also act as an energy storage inductor, resulting in a compact and simple power supply.

[0033] In some embodiments, as Figure 1 and Figure 2 As shown, the startup circuit 30 includes: a first switch tube Q1, a first communication end of the first switch tube Q1 is connected to the intermediate voltage signal HV, a control end of the first switch tube Q1 is electrically connected to the bus 20, and a second communication end of the first switch tube Q1 is electrically connected to the power circuit 40; wherein, the control end of the first switch tube Q1 is turned on after receiving the high-voltage signal Vin from the bus 20, and transmits the intermediate voltage signal HV connected to the first communication end of the first switch tube Q1 to the power circuit 40.

[0034] When the busbar 20 receives the high-voltage signal Vin, the first switch Q1 is turned on under the control of the high-voltage signal Vin, thereby transmitting the intermediate voltage signal HV from the first communication terminal to the power circuit 40, thereby powering up the power circuit 40. This circuit structure is simple, with a small number of components, and can alleviate the problems of low circuit integration and high cost caused by the use of a large number of high-voltage components.

[0035] In some embodiments, as Figure 2 、 Figure 3 As shown, the power supply circuit 10 may further include a first diode D1, whose anode is electrically connected to the second communication end of the first switch tube Q1, and whose cathode is electrically connected to the power supply circuit 40, thereby enabling unidirectional conduction from the first switch tube Q1 to the power supply circuit 40 and improving the reliability of the circuit.

[0036] In some embodiments, the first switch tube Q1 is an NPN transistor, a collector of which is connected to the intermediate voltage signal HV, a base of which is electrically connected to the bus 20 , and an emitter of which is electrically connected to the power circuit 40 .

[0037] In some embodiments, as Figure 2 As shown, the power supply circuit 10 further includes a resistor R1 and a resistor R2; the resistor R1 is electrically connected between the bus 20 and the control end of the first switch tube Q1 to at least limit the current of the electrical branch; the resistor R2 is electrically connected between the access point of the intermediate voltage signal HV and the first communication end of the first switch tube Q1 to at least limit the current of the electrical branch.

[0038] It should be noted that the voltage of the intermediate voltage signal HV is divided by the resistor R2, but this does not affect the power supply to the power circuit 40. For ease of description, the electrical signals before and after voltage division are both referred to as the intermediate voltage signal HV.

[0039] Of course, in other embodiments, other switching tubes or circuits may be used to replace the NPN transistor and its peripheral circuits. The first switching tube Q1 of the present application does not need to have high voltage resistance characteristics.

[0040] In some embodiments, as Figure 3 As shown, the flyback switching power supply 50 is provided with a high-voltage side input terminal A1, a high-voltage side feedback terminal A2 and a low-voltage side output terminal B. The high-voltage side input terminal A1 is electrically connected to the bus 20, and the high-voltage side feedback terminal A2 is electrically connected to the power supply circuit 40 to supply power to the power supply circuit 40 in the working state; the low-voltage side output terminal B of the flyback switching power supply 50 outputs a low-voltage signal.

[0041] During the startup phase of the power supply circuit 40, it is powered on by the intermediate voltage signal HV provided by the startup circuit 30. During the operating phase, the power supply circuit 40 obtains the feedback voltage signal AUX from the high-side feedback terminal A2 of the flyback switching power supply 50 to supply power through the high-side feedback terminal A2 of the flyback switching power supply 50. This circuit structure can simplify the circuit structure and reduce circuit losses. The low-voltage side output terminal B of the flyback switching power supply 50 outputs a low-voltage signal for powering the load.

[0042] In some embodiments, as Figure 2 and Figure 3 As shown, the startup circuit 30 also includes: a second switch tube Q2, a first communication end of the second switch tube Q2 is electrically connected to the bus 20, a control end of the second switch tube Q2 is electrically connected to the power circuit 40 and the high-voltage side feedback end A2, respectively, and a second communication end of the second switch tube Q2 is grounded; wherein, the control end of the second switch tube Q2 is turned on after obtaining the feedback voltage signal AUX from the high-voltage side feedback end A2, so as to supply power to the power circuit 40 in a competitive manner with the high-voltage side feedback end A2.

[0043] This embodiment utilizes feedback voltage signal AUX to compete with startup circuit 30 for powering power to power circuit 40, providing diverse power supply methods and improving reliability. Under rated conditions, feedback voltage signal AUX is relatively high, for example, 22V (after the second switch Q2 is turned on, the voltage at its control terminal is relatively low). Feedback voltage signal AUX primarily powers the power supply chip, reducing circuit losses.

[0044] In some embodiments, the first communication end of the second switch tube Q2 is electrically connected to the bus 20 via the resistor R1. After the second switch tube Q2 is turned on, the first switch tube Q1 can be bypassed, thereby reducing the static power consumption of the circuit.

[0045] In some embodiments, as Figure 2 、 Figure 3 As shown, the power supply circuit 10 may further include a second diode D2, whose anode is electrically connected to the control end of the second switch tube Q2, and whose cathode is electrically connected to the power supply circuit 40, thereby enabling unidirectional conduction from the second switch tube Q2 to the power supply circuit 40 and improving the reliability of the circuit.

[0046] In some embodiments, the second switch transistor Q2 is an NMOS transistor, a drain of which is electrically connected to the bus 20 , an anode of which is connected to the feedback voltage signal AUX, and a source of which is grounded.

[0047] Of course, in other embodiments, other switch tubes or circuits may be used to replace the NMOS tube and its peripheral circuits. The second switch tube Q2 of the present application does not need to have high voltage resistance characteristics.

[0048] In some embodiments, as Figure 3 As shown, the power supply circuit 10 further includes: a rectifier diode D4 , whose anode is electrically connected to the high-voltage side feedback terminal A2 , and whose cathode is electrically connected to the anode of the second diode D2 and the start-up circuit 30 .

[0049] In some embodiments, as Figure 3 As shown, the power supply circuit 10 further includes a voltage stabilizing circuit 60, which is electrically connected to the startup circuit 30 and the power supply circuit 40, and is at least configured to stabilize the intermediate voltage signal and then supply it to the power supply circuit 40. In this embodiment, the voltage stabilizing circuit 60 stabilizes the power supply signal of the power supply circuit 40, thereby improving the operating stability of the power supply circuit 40, thereby extending its service life, and enhancing the reliability of the power supply circuit 10.

[0050] In some embodiments, the voltage stabilizing circuit 60 may include a voltage stabilizing diode, etc.

[0051] In some embodiments, the voltage stabilizing circuit 60 is further electrically connected to the flyback switching power supply 50 .

[0052] Specifically, the voltage stabilizing circuit 60 is electrically connected to the power circuit 40 , the cathode of the first diode D1 , and the cathode of the second diode D2 , respectively, and can realize voltage stabilization processing of different power supply stages and different power supply signals of the power circuit 40 .

[0053] In some embodiments, as Figure 3 As shown, the power supply circuit 10 also includes: an isolation amplifier 70, which is electrically connected to the power supply circuit 40 and the low-voltage side output terminal B, respectively, and is used to feed back the low-voltage signal output by the low-voltage side output terminal B to the power supply circuit 40, so that the power supply circuit 40 adjusts the control of the flyback switching power supply 50 based on the low-voltage signal.

[0054] The power supply circuit 40 of this embodiment adjusts the control of the flyback switching power supply 50 based on the low-voltage signal outputted from the low-voltage side output terminal B of the flyback switching power supply 50 , thereby improving the power supply stability of the power supply circuit 10 .

[0055] Among them, the isolation amplifier 70 can not only serve as a feedback circuit to realize the feedback of the low-voltage signal to the power supply circuit 40, but also realize the electrical isolation between the high-voltage side and the low-voltage side; and the isolation amplifier 70 can convert the low-voltage signal on the low-voltage side into an electrical signal on the high-voltage side, which can improve the reliability of the power supply circuit 40 in identifying the low-voltage signal.

[0056] In other embodiments, an optical coupler may be used instead of the isolation amplifier 70 .

[0057] In some embodiments, the power supply circuit 10 may further include a transistor Q4 electrically connected between the isolation amplifier 70 and the power supply circuit 40 , and configured to further feed back the fed-back low-voltage signal to the power supply circuit 40 .

[0058] In some embodiments, as Figure 3 As shown, the power supply circuit 10 also includes: a low-voltage battery 71, which is electrically connected to the low-voltage side output terminal B. The low-voltage side output terminal B charges the low-voltage battery 71 or supplies power to the load in a competitive manner with the low-voltage battery 71.

[0059] After the power supply circuit 40 and the flyback switching power supply 50 operate normally, the flyback switching power supply 50 outputs a stable low-voltage signal to compete with the low-voltage battery 71 for powering the load. When the voltage of the low-voltage battery 71 is too low, the low-voltage signal can charge the low-voltage battery 71. The low-voltage signal generated by the flyback switching power supply 50 competes with the low-voltage battery 71 for powering the load, and can be connected to the high-voltage signal on the bus 20. After the power supply circuit 40 is started, the power output of the low-voltage battery 71 is reduced, and the low-voltage battery 71 can be charged, so that the low-voltage battery 71 can maintain its power. When the bus 20 is powered off or the power supply circuit 40 is abnormal, the low-voltage battery 71 can power the load, thereby improving the reliability of the power supply circuit 10.

[0060] In some embodiments, as Figure 3 As shown, the power supply circuit 10 further includes a voltage conversion circuit 80 electrically connected to the low-voltage side output terminal B. The voltage conversion circuit 80 converts the low-voltage signal output from the low-voltage side output terminal B into a voltage-converting signal before supplying it to the load. The voltage conversion circuit 80 can achieve voltage conversion on the low-voltage side, thereby ensuring that the output voltage of the power supply circuit 10 better meets the power supply requirements of the load.

[0061] In some embodiments, the voltage conversion circuit 80 can convert a low voltage signal into a plurality of voltage signals of different voltages to meet complex multi-power supply requirements.

[0062] In some embodiments, the power supply circuit 10 further includes a clamping circuit 100 electrically connected between the busbar 20 and the same-name terminal of the primary coil on the high-voltage side of the flyback switching power supply 50 to stabilize the voltage of the primary coil. The third switching transistor Q3 is electrically connected to the same-name terminal.

[0063] In some embodiments, as Figure 2 and Figure 3 As shown, after the bus 20 receives the high-voltage signal Vin, the intermediate voltage signal HV is generated by the transistor (first switch Q1) in the startup circuit 30. This intermediate voltage signal HV is then passed through the voltage regulator circuit 60 to supply power to the power circuit 40 (power supply terminal VCC). When the power circuit 40 is operating, the flyback switching power supply 50 generates a 12V low-voltage backup power supply (low-voltage signal) and a 22V auxiliary power supply (feedback voltage signal AUX). When the feedback voltage signal AUX reaches a certain threshold, the MOS transistor (second switch Q2) in the startup circuit 30 is turned on, bypassing the first switch Q1 circuit to reduce static power consumption. Simultaneously, the feedback voltage signal AUX competes with the startup circuit 30 for power supply. Under rated conditions, the feedback voltage signal AUX is higher, and the power circuit 40 is primarily powered by the feedback voltage signal AUX, reducing circuit losses. When the flyback switching power supply 50 is operating normally, it generates a stable 12V backup power supply (low-voltage signal) that competes with the low-voltage battery 71 to supply power to the load. If the voltage of the low-voltage battery 71 is too low, it can be charged by the 12V backup power supply. At the same time, the 12V backup power supply converts the voltage signal (low-voltage signal) on the low-voltage side into a voltage signal on the high-voltage side through the isolation amplifier 70, and inputs it to the COMP pin of the power supply circuit 40 to adjust the control of the switch tube Q3 through the Gate pin, thereby improving the stability of the low-voltage signal output on the low-voltage side.

[0064] The low-voltage battery 71 and the 12V backup power supply of this embodiment are dual power supplies, which improves the reliability of power supply; the low-voltage battery 71 can be charged; this embodiment optimizes the starting circuit 30, reduces the use of high-voltage MOS tubes, greatly reduces circuit cost, and has lower power consumption; multiple power supplies compete for power supply to the power supply circuit 40, improves circuit stability, and has lower static power consumption; the voltage feedback on the low-voltage side is performed through the isolation amplifier 70, which is low-cost and highly reliable compared to feedback methods such as optocouplers.

[0065] This application further proposes a motor controller, such as Figure 4 As shown, the motor controller includes a power supply circuit 10 and a drive circuit 90 electrically connected to the power supply circuit 10. The drive circuit 90 drives the load after receiving the low-voltage signal. The load can be a motor, and the drive circuit 90 can be electrically connected to the motor's inverter circuit Q5.

[0066] The driving circuit 10 can refer to the above embodiments.

[0067] The present application further proposes an electric vehicle, comprising a motor, the motor controller or the power supply circuit 10 .

[0068] The electric vehicle of this embodiment is a pure electric vehicle, such as a new energy vehicle. The electric vehicle may also be a hybrid vehicle.

[0069] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: The power supply circuit includes: busbar; a starting circuit, electrically connected to the busbar; a power supply circuit, electrically connected to the starting circuit, A flyback switching power supply, electrically connected to the bus and the power circuit respectively; The startup circuit generates an intermediate voltage signal when receiving a high-voltage signal from the bus; the power supply circuit starts operating based on the intermediate voltage signal; and when in operation, the power supply circuit controls the flyback switching power supply to step down the high-voltage signal received from the bus and output a low-voltage signal. The voltage of the intermediate voltage signal is lower than the voltage of the high voltage signal.

2. The power supply circuit according to claim 1, wherein: The startup circuit comprises: a first switching tube, wherein a first communication terminal of the first switching tube is connected to the intermediate voltage signal, a control terminal of the first switching tube is electrically connected to the bus, and a second communication terminal of the first switching tube is electrically connected to the power circuit; The control end of the first switch tube is turned on after receiving the high-voltage signal from the bus, and transmits the intermediate voltage signal connected to the first communication end to the power circuit.

3. The power supply circuit according to claim 2, wherein: The flyback switching power supply is provided with a high-voltage side input terminal, a high-voltage side feedback terminal and a low-voltage side output terminal. The high-voltage side input terminal is electrically connected to the bus, and the high-voltage side feedback terminal is electrically connected to the power supply circuit to supply power to the power supply circuit in the working state; the low-voltage side output terminal of the flyback switching power supply outputs the low-voltage signal.

4. The power supply circuit according to claim 3, characterized in that: The startup circuit further includes: a second switching tube, wherein a first communication terminal of the second switching tube is electrically connected to the bus, a control terminal of the second switching tube is electrically connected to the power circuit and the high-voltage side feedback terminal respectively, and a second communication terminal of the second switching tube is grounded; The control end of the second switch tube is turned on after obtaining a feedback voltage signal from the high-voltage side feedback end, so as to supply power to the power circuit in a competitive manner with the high-voltage side feedback end.

5. The power supply circuit according to any one of claims 1 to 4, characterized in that: The power supply circuit further includes: The voltage stabilizing circuit is electrically connected to the startup circuit and the power supply circuit respectively, and is at least used for stabilizing the intermediate voltage signal and then supplying it to the power supply circuit.

6. The power supply circuit according to claim 3, characterized in that: The power supply circuit further includes: An isolation amplifier is electrically connected to the power supply circuit and the low-voltage side output end, respectively, and is used to feed back the low-voltage signal output by the low-voltage side output end to the power supply circuit, so that the power supply circuit adjusts the control of the flyback switching power supply based on the low-voltage signal.

7. The power supply circuit according to claim 3, characterized in that: The power supply circuit further includes: A low-voltage battery is electrically connected to the low-voltage side output end, and the low-voltage side output end charges the low-voltage battery or supplies power to a load in a competitive manner with the low-voltage battery.

8. The power supply circuit according to claim 3, characterized in that: The power supply circuit further includes: The voltage conversion circuit is electrically connected to the low-voltage side output end, and the voltage conversion circuit changes the voltage of the low-voltage signal output by the low-voltage side output end and supplies the changed voltage to a load.

9. A motor controller, characterized in that: The motor controller comprises: The power supply circuit according to any one of claims 1 to 8; The driving circuit is connected to the power supply circuit.

10. An electric vehicle, characterized in that: The electric vehicle comprises the power supply circuit according to any one of claims 1 to 8 or the motor controller according to claim 9.

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