Power supply circuit, motor controller and vehicle

Abstract

The invention provides a power supply circuit, a motor controller and a vehicle, the power supply circuit comprises an anti-reverse connection circuit and a wake-up circuit, the anti-reverse connection circuit comprises a first switch tube and a second switch tube, and the first switch tube and the second switch tube are connected in series between a low-voltage power supply and a post-stage circuit and are oppositely arranged; and when the wake-up circuit receives at least one of a power-on wake-up signal, a network wake-up signal and a post-stage power supply signal, the first switch tube and the second switch tube are controlled to be switched on, so that the low-voltage power supply supplies power to the post-stage circuit. And when the wake-up circuit does not receive the power-on wake-up signal, the network wake-up signal and the post-stage power supply signal, the first switch tube and the second switch tube are controlled to be disconnected, so that the low-voltage power supply is disconnected from the post-stage circuit, and rapid power-off of the post-stage circuit is realized. The on-off of the first switch tube and the second switch tube is controlled by the wake-up circuit according to the power-on wake-up signal, the network wake-up signal and the post-stage power supply signal, so that the power-on and power-off of the post-stage circuit are controllable, and the reliability of the power supply circuit is improved.

Description

Technical Field

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

[0002] The motor controller is the control unit of the vehicle's power system. The low-voltage power supply of the motor controller is provided by the low-voltage battery in the vehicle. In order to prevent the low-voltage battery from being connected in reverse, an anti-reverse connection circuit is set in the motor controller. At present, the anti-reverse connection circuit is implemented by setting a diode. The diode is an uncontrollable device with poor reliability and cannot achieve rapid power-off of the motor controller. Summary of the invention

[0003] In view of this, the present application proposes a power supply circuit, a motor controller and a vehicle to solve the above problems.

[0004] The present application proposes a power supply circuit, including: an anti-reverse connection circuit, the anti-reverse connection circuit including a first switch tube and a second switch tube, the first switch tube and the second switch tube are connected in series between a low-voltage power supply and a subsequent circuit, and the first switch tube and the second switch tube are arranged oppositely; and a wake-up circuit, the wake-up circuit connects the control ends of the first switch tube and the second switch tube; the wake-up circuit is used to: when receiving at least one of a power-on wake-up signal, a network wake-up signal and a subsequent power supply signal, control the first switch tube and the second switch tube to be turned on so that the low-voltage power supply supplies power to the subsequent circuit; when not receiving the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, control the first switch tube and the second switch tube to be turned off so that the subsequent circuit is powered off.

[0005] In one embodiment, the wake-up circuit includes a third switch tube, the control end of the third switch tube is used to receive a power-on wake-up signal, a network wake-up signal and a subsequent power supply signal, the first end of the third switch tube is connected to the control ends of the first switch tube and the second switch tube, and the second end of the third switch tube is connected to a low-voltage power supply.

[0006] In one embodiment, the wake-up circuit also includes a voltage charging and discharging unit, a first end of the voltage charging and discharging unit is connected to the connecting end of the first switch tube and the second switch tube, and a second end of the voltage charging and discharging unit is connected to the control end of the first switch tube and the second switch tube. The voltage charging and discharging unit is used to: when the control end of the third switch tube receives at least one of a power-on wake-up signal, a network wake-up signal and a subsequent power supply signal, clamp the voltage difference between the control end and the connecting end of the first switch tube and the second switch tube to a first voltage, and the first voltage turns on the first switch tube and the second switch tube.

[0007] In one embodiment, the wake-up circuit also includes a power-off auxiliary unit, which is used to switch the voltage difference between the control end and the connection end of the first switch tube and the second switch tube from a first voltage to a second voltage when no power-on wake-up signal, a network wake-up signal and a subsequent power supply signal are received, and the second voltage disconnects the first switch tube and the second switch tube.

[0008] In one embodiment, the voltage charging and discharging unit includes a decoupling capacitor, a first voltage-dividing resistor and a second voltage-dividing resistor; the first end of the decoupling capacitor and the first voltage-dividing resistor is connected to the connection end of the first switching tube and the second switching tube, and the second end of the decoupling capacitor and the first voltage-dividing resistor is connected to the control end of the first switching tube and the second switching tube; the first end of the second voltage-dividing resistor is connected to the second end of the first voltage-dividing resistor, and the second end of the second voltage-dividing resistor is connected to the first end of the third switching tube.

[0009] In one embodiment, the power-off auxiliary unit includes a fourth switch tube, a third voltage-dividing resistor and a fourth voltage-dividing resistor; the first end of the fourth switch tube is connected to the connection end of the first switch tube and the second switch tube, and the second end of the fourth switch tube is connected to the control end of the first switch tube and the second switch tube; the first end of the third voltage-dividing resistor is connected to the first end of the fourth switch tube, the second end of the third voltage-dividing resistor is connected to the control end of the fourth switch tube and the first end of the fourth voltage-dividing resistor, and the second end of the fourth voltage-dividing resistor is connected to the first end of the third switch tube; wherein, when at least one of a power-on wake-up signal, a network wake-up signal and a subsequent power supply signal is received, the fourth switch tube is disconnected; when the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal are not received, the fourth switch tube is turned on to provide a discharge path for the decoupling capacitor.

[0010] In one embodiment, the first switch tube and the second switch tube are PMOS tubes, the third switch tube is an NMOS tube, and the fourth switch tube is an NPN transistor; the drain of the first switch tube is connected to the positive electrode of the low-voltage power supply, the source of the first switch tube is connected to the source of the second switch tube, the first end of the decoupling capacitor, the first end of the first voltage-dividing resistor and the first end of the third voltage-dividing resistor; the drain of the second switch tube is connected to the subsequent circuit; the drain of the third switch tube is connected to the gate of the first switch tube and the second switch tube, the source of the third switch tube is connected to the negative electrode of the low-voltage power supply, and the gate of the third switch tube is used to receive a power-on wake-up signal, a network wake-up signal and a subsequent power supply signal; the collector of the fourth switch tube is connected to the source of the first switch tube and the second switch tube, the emitter of the fourth switch tube is connected to the gate of the first switch tube and the second switch tube, and the base of the fourth switch tube is connected to the second end of the third voltage-dividing resistor.

[0011] In one embodiment, the wake-up circuit also includes a first diode, a second diode, a third diode and a current limiting resistor; the anode of the first diode is used to receive a power-on wake-up signal, the anode of the second diode is used to receive a network wake-up signal, the anode of the third diode is used to receive a subsequent power supply signal, the cathodes of the first diode, the second diode and the third diode are connected to the first end of the current limiting resistor, and the second end of the current limiting resistor is connected to the control end of the third switch tube.

[0012] The present application also proposes a motor controller, comprising the above power supply circuit.

[0013] The present application also proposes a vehicle, comprising a motor and a motor controller as described above, wherein the motor controller is connected to the motor and is used to control the operation of the motor.

[0014] In the embodiment of the present application, a wake-up circuit is provided. When the wake-up circuit receives at least one of a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, the wake-up circuit controls the first switch tube and the second switch tube to be turned on, so that the low-voltage power supply supplies power to the subsequent circuit. When the wake-up circuit does not receive the power-on wake-up signal, the network wake-up signal, and the subsequent power supply signal, the wake-up circuit controls the first switch tube and the second switch tube to be turned off, so as to disconnect the low-voltage power supply from the subsequent circuit, thereby realizing rapid power-off of the subsequent circuit. The first switch tube and the second switch tube are controlled on and off by the wake-up circuit according to the power-on wake-up signal, the network wake-up signal, and the subsequent power supply signal, so that the power on and off of the subsequent circuit can be controlled, thereby improving the reliability of the power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural block diagram of the power supply circuit proposed in the embodiment of the present application.

[0016] Figure 2 It is a structural block diagram of a power supply circuit proposed in another embodiment of the present application.

[0017] Figure 3 This is a structural block diagram of a power supply circuit proposed in yet another embodiment of the present application.

[0018] Figure 4 It is a circuit schematic diagram of the power supply circuit proposed in the embodiment of the present application.

[0019] Figure 5 It is a structural block diagram of the motor controller proposed in the embodiment of the present application.

[0020] Figure 6 It is a structural block diagram of the vehicle proposed in the embodiment of the present application.

[0021] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to modulate this application.

[0024] The terms "first" and "second" in the specification of the present application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any variation thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or modules is not limited to the listed steps or modules, but may optionally include steps or modules that are not listed, or may optionally include other steps or modules that are inherent to these processes, methods, products or devices.

[0025] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] See also Figure 1 , is a power supply circuit 110 provided in an embodiment of the present application, and the power supply circuit 110 includes an anti-reverse connection circuit 111 and a wake-up circuit 112.

[0027] The anti-reverse connection circuit 111 includes a first switch tube Q1 and a second switch tube Q2, which are connected in series between the low-voltage power supply 200 and the subsequent circuit 120, and are arranged opposite to each other.

[0028] In the embodiment of the present application, the first switch tube Q1 and the second switch tube Q2 are arranged oppositely, which means that the first switch tube Q1 and the second switch tube Q2 are connected at the same end. For example, when the first switch tube Q1 and the second switch tube Q2 are MOS tubes, the source of the first switch tube Q1 is connected to the source of the second switch tube Q2. For another example, when the first switch tube Q1 and the second switch tube Q2 are triodes, the emitter of the first switch tube Q1 is connected to the emitter of the second switch tube Q2.

[0029] The wake-up circuit 112 is connected to the control end of the first switch tube Q1 and the second switch tube Q2. The wake-up circuit 112 is used to control the first switch tube Q1 and the second switch tube Q2 to conduct when receiving at least one of a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, so that the low-voltage power supply 200 supplies power to the subsequent circuit 120.

[0030] The power-on wake-up signal may be a power-on signal of a device, apparatus or vehicle 10 to which the power supply circuit 110 of the embodiment of the present application is applied. For example, it may be a key power-on signal of the vehicle 10 to which the power supply circuit 110 of the embodiment of the present application is applied. The wake-up circuit 112 receives a network wake-up signal through a communication line. For example, after the vehicle 10 to which the embodiment of the present application is applied is powered on, a network wake-up signal may be sent to the wake-up circuit 112 through the communication line, or after the vehicle 10 receives the remote wake-up signal, a network wake-up signal may be sent to the wake-up circuit 112 through the communication line. The power-on wake-up signal and the network wake-up signal may exist at the same time, or only one may exist.

[0031] The subsequent power supply signal is a signal indicating that the subsequent circuit 120 is powered on, that is, the subsequent power supply signal is generated after the wake-up circuit 112 controls the first switch tube Q1 and the second switch tube Q2 to be turned on, so that the low-voltage power supply 200 supplies power to the subsequent circuit 120. The wake-up circuit 112 can be connected to the subsequent circuit 120 through a connection line to detect whether the subsequent circuit 120 is powered on. When the subsequent circuit 120 is powered on, the subsequent power supply signal is sent to the wake-up circuit 112 through the connection line.

[0032] It can be understood that before power is turned on, the wake-up circuit 112 first receives a power-on wake-up signal or a network wake-up signal, and then controls the first switch tube Q1 and the second switch tube Q2 to be turned on, so that the low-voltage power supply 200 supplies power to the subsequent circuit 120. After the subsequent circuit 120 is powered on, the wake-up circuit 112 will receive the subsequent power supply signal. At this time, even if the power-on wake-up signal and the network wake-up signal disappear, the wake-up circuit 112 can still control the first switch tube Q1 and the second switch tube Q2 to remain in the on state according to the subsequent power supply signal, so that the low-voltage power supply 200 can continue to supply power to the subsequent circuit 120, ensuring the normal operation of the subsequent circuit 120.

[0033] When the wake-up circuit 112 does not receive the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the first switch tube Q1 and the second switch tube Q2 are controlled to be turned off, so that the subsequent circuit 120 is powered off.

[0034] When the wake-up circuit 112 does not receive the power-on wake-up signal, the network wake-up signal, and the subsequent power supply signal, it means that the subsequent circuit 120 has stopped running, and the equipment, device, or vehicle 10 using the power supply circuit 110 of the embodiment of the present application is not powered on. At this time, the wake-up circuit 112 controls the first switch tube Q1 and the second switch tube Q2 to disconnect, disconnecting the low-voltage power supply 200 and the subsequent circuit 120 to prevent the subsequent circuit 120 from consuming the electric energy of the low-voltage power supply 200 when it stops running. In this way, the embodiment of the present application can realize the rapid power-off of the subsequent circuit 120.

[0035] In the embodiment of the present application, by setting the wake-up circuit 112, when the wake-up circuit 112 receives at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the wake-up circuit 112 controls the first switch tube Q1 and the second switch tube Q2 to be turned on, so that the low-voltage power supply 200 supplies power to the subsequent circuit 120. When the wake-up circuit 112 does not receive the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the wake-up circuit 112 controls the first switch tube Q1 and the second switch tube Q2 to be turned off, so as to disconnect the low-voltage power supply 200 from the subsequent circuit 120, and realize the rapid power-off of the subsequent circuit 120. The first switch tube Q1 and the second switch tube Q2 are controlled to be turned on and off by the wake-up circuit 112 according to the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, so that the power on and off of the subsequent circuit 120 can be controlled, thereby improving the reliability of the power supply circuit 110.

[0036] Furthermore, if Figure 2 As shown, the wake-up circuit 112 includes a third switch tube Q3, the control end of the third switch tube Q3 is used to receive a power-on wake-up signal, a network wake-up signal and a subsequent power supply signal, the first end of the third switch tube Q3 is connected to the control ends of the first switch tube Q1 and the second switch tube Q2, and the second end of the third switch tube Q3 is connected to the low-voltage power supply 200.

[0037] That is to say, the third switch tube Q3 is turned on and off according to the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, thereby changing the level signal of the control end of the first switch tube Q1 and the second switch tube Q2, realizing the on-off control of the first switch tube Q1 and the second switch tube Q2, and then controlling the power supply of the low-voltage power supply 200 to the subsequent circuit 120. Compared with directly controlling the first switch tube Q1 and the second switch tube Q2 through the chip, the embodiment of the present application can reduce the dark current in the circuit, thereby preventing the dark current of the chip from being transmitted in the circuit when the power is off, affecting the circuit performance.

[0038] The third switch tube Q3 can be turned on when receiving at least one of a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, so that the first switch tube Q1 and the second switch tube Q2 are also turned on. Correspondingly, the third switch tube Q3 can be turned off when not receiving a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, so that the first switch tube Q1 and the second switch tube Q2 are also turned off.

[0039] In some other embodiments, the third switch tube Q3 may also be turned off when receiving at least one of a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, so that the first switch tube Q1 and the second switch tube Q2 are turned on. Correspondingly, the third switch tube Q3 may be turned on when not receiving a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, so that the first switch tube Q1 and the second switch tube Q2 are also turned off.

[0040] It can be understood that whether the third switch tube Q3 turns on the first switch tube Q1 and the second switch tube Q2 when it is turned on, or turns on the first switch tube Q1 and the second switch tube Q2 when it is turned off, can be determined according to the selected models of the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 and the specific circuit structure, and the embodiment of the present application is not limited to this.

[0041] See also Figure 3 In some embodiments, the wake-up circuit 112 may further include a voltage charging and discharging unit 1121. The first end of the voltage charging and discharging unit 1121 is connected to the connection end of the first switch tube Q1 and the second switch tube Q2, and the second end of the voltage charging and discharging unit 1121 is connected to the control end of the first switch tube Q1 and the second switch tube Q2. When the control end of the third switch tube Q3 receives at least one of a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, the voltage charging and discharging unit 1121 clamps the voltage difference between the control end and the connection end of the first switch tube Q1 and the second switch tube Q2 to a first voltage, and the first voltage turns on the first switch tube Q1 and the second switch tube Q2.

[0042] That is to say, when the control end of the third switch tube Q3 receives at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the third switch tube Q3 enables the voltage charging and discharging unit 1121 to clamp the voltage difference between the control end and the connection end of the first switch tube Q1 and the second switch tube Q2 to the first voltage, and the first voltage is the turn-on voltage of the first switch tube Q1 and the second switch tube Q2, thereby realizing the conduction of the first switch tube Q1 and the second switch tube Q2.

[0043] Furthermore, the wake-up circuit 112 also includes a power-off auxiliary unit 1122. The power-off auxiliary unit 1122 is used to switch the voltage difference between the control end and the connection end of the first switch tube Q1 and the second switch tube Q2 from the first voltage to the second voltage when the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal are not received, and the second voltage disconnects the first switch tube Q1 and the second switch tube Q2.

[0044] That is, when the control end of the third switch tube Q3 does not receive the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the first voltage clamped by the voltage charging and discharging unit 1121 is switched to the second voltage through the power-off auxiliary unit 1122, so that the first switch tube Q1 and the second switch tube Q2 are disconnected, and the low-voltage power supply 200 and the subsequent circuit 120 are disconnected, thereby realizing the rapid power-off of the subsequent circuit 120.

[0045] See also Figure 4 The voltage charging and discharging unit 1121 may include a decoupling capacitor C1, a first voltage-dividing resistor R1, and a second voltage-dividing resistor R2. The first end of the decoupling capacitor C1 and the first voltage-dividing resistor R1 is connected to the connection end of the first switch tube Q1 and the second switch tube Q2, and the second end of the decoupling capacitor C1 and the first voltage-dividing resistor R1 is connected to the control end of the first switch tube Q1 and the second switch tube Q2. The first end of the second voltage-dividing resistor R2 is connected to the second end of the first voltage-dividing resistor R1, and the second end of the second voltage-dividing resistor R2 is connected to the first end of the third switch tube Q3.

[0046] The decoupling capacitor C1 can be charged by the low-voltage power supply 200 through the first switch tube Q1 and the third switch tube Q3, and the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 can divide the voltage or provide a discharge path for the decoupling capacitor C1, so that the voltage difference between the connection end and the control end of the first switch tube Q1 and the second switch tube Q2 can be switched between the first voltage and the second voltage.

[0047] The voltage charging and discharging unit 1121 may include two first voltage dividing resistors R1 to accelerate the discharge speed when the decoupling capacitor C1 needs to be discharged.

[0048] The power-off auxiliary unit 1122 includes a fourth switch tube Q4, a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4. The first end of the fourth switch tube Q4 is connected to the connection end of the first switch tube Q1 and the second switch tube Q2, and the second end of the fourth switch tube Q4 is connected to the control end of the first switch tube Q1 and the second switch tube Q2. The first end of the third voltage-dividing resistor R3 is connected to the first end of the fourth switch tube Q4, the second end of the third voltage-dividing resistor R3 is connected to the control end of the fourth switch tube Q4 and the first end of the fourth voltage-dividing resistor R4, and the second end of the fourth voltage-dividing resistor R4 is connected to the first end of the third switch tube Q3. Among them, when at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal is received, the fourth switch tube Q4 is disconnected; when the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal are not received, the fourth switch tube Q4 is turned on to provide a discharge path for the decoupling capacitor C1.

[0049] In this way, when the low-voltage power supply 200 supplies power to the subsequent circuit 120, the fourth switch tube Q4 is disconnected from the decoupling capacitor C1, ensuring that the first switch tube Q1 and the second switch tube Q2 can remain in the on state. When the low-voltage power supply 200 and the subsequent circuit 120 need to be disconnected, the fourth switch tube Q4 is turned on to further speed up the discharge speed of the decoupling capacitor C1, and then the first switch tube Q1 and the second switch tube Q2 are disconnected, which can further speed up the power-off speed of the subsequent circuit 120.

[0050] Specifically, the first switch tube Q1 and the second switch tube Q2 are PMOS tubes, the third switch tube Q3 is an NMOS tube, and the fourth switch tube Q4 is an NPN transistor.

[0051] At this time, the drain of the first switch tube Q1 is connected to the positive electrode of the low-voltage power supply 200, and the source of the first switch tube Q1 is connected to the source of the second switch tube Q2, the first end of the decoupling capacitor C1, the first end of the first voltage-dividing resistor R1, and the first end of the third voltage-dividing resistor R3. The drain of the second switch tube Q2 is connected to the post-stage circuit 120. The drain of the third switch tube Q3 is connected to the gate of the first switch tube Q1 and the second switch tube Q2, the source of the third switch tube Q3 is connected to the negative electrode of the low-voltage power supply 200, and the gate of the third switch tube Q3 is used to receive a power-on wake-up signal, a network wake-up signal, and a post-stage power supply signal. The collector of the fourth switch tube Q4 is connected to the source of the first switch tube Q1 and the second switch tube Q2, the emitter of the fourth switch tube Q4 is connected to the gate of the first switch tube Q1 and the second switch tube Q2, and the base of the fourth switch tube Q4 is connected to the second end of the third voltage-dividing resistor R3.

[0052] Based on this, the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal are all high-level signals.

[0053] When the control end of the third switch tube Q3 receives a power-on wake-up signal or a network wake-up signal, the control end of the third switch tube Q3 is pulled high, the third switch tube Q3 is turned on, and the positive electrode of the low-voltage power supply 200 charges the decoupling capacitor C1 through the parasitic diode of the first switch tube Q1, and the voltage across the decoupling capacitor C1 gradually increases. The fourth switch tube Q4 is originally in the on state, and the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are connected in series and in parallel with the second voltage-dividing resistor R2. As the voltage across the decoupling capacitor C1 increases, the voltage division of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 also increases. When the voltage division of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 makes the voltage of the control end of the fourth switch tube Q4 less than the emitter voltage of the fourth switch tube Q4, the fourth switch tube Q4 is turned off. Then, the voltage difference between the gate and the source of the first switch tube Q1 and the second switch tube Q2 is obtained by dividing the voltage of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 in series. When the voltage across the first voltage-dividing resistor R1 reaches the conduction voltage (i.e., the first voltage) of the first switch tube Q1 and the second switch tube Q2, the first switch tube Q1 and the second switch tube Q2 are turned on, so that the low-voltage power supply 200 supplies power to the subsequent circuit 120. After the subsequent circuit 120 is powered on, a subsequent power supply signal is generated to the control end of the third switch tube Q3. Even if the power-on wake-up signal and the network wake-up signal are pulled low afterwards, as long as the subsequent circuit 120 is still working, the third switch tube Q3 can remain in the conduction state according to the subsequent power supply signal, so that the first switch tube Q1 and the second switch tube Q2 also remain in the conduction state, and the low-voltage power supply 200 can still be maintained to supply power to the subsequent circuit 120, ensuring that the subsequent circuit 120 can work normally.

[0054] When power is turned off, the control end of the third switch tube Q3 receiving the power-on wake-up signal and the network wake-up signal is first pulled low, and the subsequent circuit 120 is first controlled to stop running. At this time, the subsequent power supply signal disappears, and the third switch tube Q3 is disconnected. The second voltage-dividing resistor R2, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are connected in series to divide the voltage, increase the base voltage of the fourth switch tube Q4, so that the base voltage of the fourth switch tube Q4 is greater than the emitter voltage, and then the fourth switch tube Q4 is turned on, short-circuiting the two ends of the decoupling capacitor C1, and accelerating the discharge of the decoupling capacitor C1. When the decoupling capacitor C1 is discharged to the voltage at both ends of the decoupling capacitor C1 is less than the conduction voltage of the first switch tube Q1 and the second switch tube Q2 (the second voltage is less than the conduction voltage of the first switch tube Q1 and the second switch), the first switch tube Q1 and the second switch tube Q2 are disconnected, cutting off the connection between the low-voltage power supply 200 and the subsequent circuit 120, and realizing the rapid power-off of the subsequent circuit 120.

[0055] It can be understood that in the embodiment of the present application, the resistance values ​​of the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 can be set according to the specific models and performance parameters of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4, so as to ensure that when the third switch tube Q3 receives at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the second voltage-dividing resistor R2, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 can disconnect the fourth switch tube Q4. When the third switch tube Q3 does not receive the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the second voltage-dividing resistor R2, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 can turn on the fourth switch tube Q4.

[0056] It should be noted that, in the embodiment of the present application, since the first switch tube Q1 and the second switch tube Q2 are PMOS tubes with opposite settings, when the positive and negative poles of the low-voltage power supply 200 are reversed, the low-voltage power supply 200 will not be able to charge the decoupling capacitor C1 through the parasitic diode of the first switch tube Q1, and thus the first switch tube Q1 and the second switch tube Q2 cannot be turned on, thereby achieving anti-reverse connection. Of course, in the embodiment of the present application, in addition to the low-voltage power supply 200 supplying power to the subsequent circuit 120, the subsequent circuit 120 can also charge the low-voltage power supply 200. At this time, the subsequent circuit 120 can first charge the decoupling capacitor C1 through the parasitic diode of the second switch tube Q2, and then the first switch tube Q1 and the second switch tube Q2 are turned on, thereby achieving the subsequent circuit 120 charging the low-voltage power supply 200.

[0057] Therefore, the power supply circuit 110 of the embodiment of the present application can realize the three-in-one functions of anti-reverse connection, power-on wake-up and fast power-off.

[0058] Of course, in the embodiment of the present application, the specific models of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are not limited thereto and can be set according to actual application requirements.

[0059] In addition, in the embodiment of the present application, by connecting the first switch tube Q1 and the second switch tube Q2 to the positive terminal of the low-voltage power supply 200, but not to the negative terminal of the low-voltage power supply 200, the integrity of the grounding plane of the low-voltage power supply 200 and the grounding plane of the subsequent circuit 120 can be ensured, and the performance and reliability of electromagnetic compatibility (EMC) can be ensured. Of course, when the power supply circuit 110 is applied to some equipment with low requirements for the performance and reliability of electromagnetic compatibility, the first switch tube Q1 and the second switch tube Q2 can also be connected to the negative terminal of the low-voltage power supply 200.

[0060] In some embodiments, the wake-up circuit 112 may further include a first diode D1, a second diode D2, a third diode D3 and a current limiting resistor R5. The anode of the first diode D1 is used to receive a power-on wake-up signal, the anode of the second diode D2 is used to receive a network wake-up signal, the anode of the third diode D3 is used to receive a subsequent power supply signal, the cathodes of the first diode D1, the second diode D2 and the third diode D3 are connected to the first end of the current limiting resistor R5, and the second end of the current limiting resistor R5 is connected to the control end of the third switch tube Q3.

[0061] In this way, the power-on wake-up signal is sent to the control end of the third switch tube Q3 through the first diode D1, the network wake-up signal is sent to the control end of the third switch tube Q3 through the second diode D2, and the subsequent power supply signal is sent to the control end of the third switch tube Q3 through the third diode D3. When there is at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, but there is a signal pulled down to a low level in the anodes of the first diode D1, the second diode D2 and the third diode D3, based on the unidirectional conductivity of the first diode D1, the second diode D2 and the third diode D3, it is possible to prevent the control end of the third switch tube Q3 from being pulled down, thereby ensuring that when there is at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the first switch tube Q1 and the second switch tube Q2 can remain in the on state.

[0062] The current limiting resistor R5 is used to limit the current of the control end of the third switch tube Q3 to prevent the control end of the third switch tube Q3 from being damaged by excessive current.

[0063] See also Figure 5 , the embodiment of the present application also provides a motor controller 100, including the power supply circuit 110 as described above. Among them, the motor controller 100 is used to control the operation of the motor 130. It can be understood that the motor controller 100 includes a microcontroller, a sensor, a drive circuit and other parts. The microcontroller is used to control the drive circuit to drive the motor to operate, and the sensor is used to detect the operating state, speed, position and other parameters of the motor 130. In the embodiment of the present application, the post-stage circuit 120 in the power supply circuit 110 is a low-voltage power supply device and related circuits such as a microcontroller and a sensor in the motor controller 100.

[0064] The embodiment of the present application implements reverse connection prevention and power-on wake-up and fast power-off of the subsequent circuit 120 through the anti-reverse connection circuit 111 and the wake-up circuit 112 in the above-mentioned power supply circuit 110, which can prevent the motor controller 100 from being damaged due to reverse connection of the low-voltage power supply 200.

[0065] See also Figure 6The embodiment of the present application further provides a vehicle 10 , including a motor 130 and a motor controller 100 as described above, wherein the motor controller 100 is connected to the motor 130 , and the motor controller 100 is used to control the operation of the motor 130 .

[0066] The power supply circuit 110 in the motor controller 100 supplies power to the subsequent circuit 120, and the anti-reverse connection circuit 111 can prevent the reverse connection of the low-voltage power supply 200 from damaging the motor controller 100. The anti-reverse connection circuit 111 and the wake-up circuit 112 can work together to realize the power-on wake-up and fast power-off of the subsequent circuit 120 in the motor controller 100, ensuring the short-time power-off requirement.

[0067] In addition, in the embodiment of the present application, the wake-up circuit 112 controls the on and off of the first switch tube Q1 and the second switch tube Q2 through the third switch tube Q3, which can effectively reduce the dark current and improve the stability and reliability of the motor controller 100.

[0068] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments should fall within the scope of protection claimed in the present application.

Claims

1. A power supply circuit, characterized in that: include: An anti-reverse connection circuit, the anti-reverse connection circuit comprising a first switch tube and a second switch tube, the first switch tube and the second switch tube are connected in series between a low-voltage power supply and a subsequent circuit, and the first switch tube and the second switch tube are arranged oppositely; and A wake-up circuit, the wake-up circuit is connected to the control end of the first switch tube and the control end of the second switch tube; the wake-up circuit is used to: When receiving at least one of a power-on wake-up signal, a network wake-up signal, and a subsequent power supply signal, controlling the first switch tube and the second switch tube to be turned on so that the low-voltage power supply supplies power to the subsequent circuit; When the power-on wake-up signal, the network wake-up signal and the subsequent-stage power supply signal are not received, the first switch tube and the second switch tube are controlled to be disconnected so as to power off the subsequent-stage circuit.

2. The power supply circuit according to claim 1, characterized in that: The wake-up circuit includes a third switch tube, the control end of the third switch tube is used to receive the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, the first end of the third switch tube is connected to the control ends of the first switch tube and the second switch tube, and the second end of the third switch tube is connected to the low-voltage power supply.

3. The power supply circuit according to claim 2, characterized in that: The wake-up circuit also includes a voltage charging and discharging unit, a first end of the voltage charging and discharging unit is connected to the connecting end of the first switch tube and the second switch tube, and a second end of the voltage charging and discharging unit is connected to the control end of the first switch tube and the second switch tube. The voltage charging and discharging unit is used to: when the control end of the third switch tube receives at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal, clamp the voltage difference between the control end and the connecting end of the first switch tube and the second switch tube to a first voltage, and the first voltage turns on the first switch tube and the second switch tube.

4. The power supply circuit according to claim 3, characterized in that: The wake-up circuit also includes a power-off auxiliary unit, which is used to switch the voltage difference between the control end and the connection end of the first switch tube and the second switch tube from the first voltage to a second voltage when the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal are not received, and the second voltage disconnects the first switch tube and the second switch tube.

5. The power supply circuit according to claim 3 or 4, characterized in that: The voltage charging and discharging unit includes a decoupling capacitor, a first voltage-dividing resistor and a second voltage-dividing resistor; the first ends of the decoupling capacitor and the first voltage-dividing resistor are connected to the connection end of the first switching tube and the second switching tube, and the second ends of the decoupling capacitor and the first voltage-dividing resistor are connected to the control ends of the first switching tube and the second switching tube; the first end of the second voltage-dividing resistor is connected to the second end of the first voltage-dividing resistor, and the second end of the second voltage-dividing resistor is connected to the first end of the third switching tube.

6. The power supply circuit according to claim 5, characterized in that: The power-off auxiliary unit includes a fourth switch tube, a third voltage-dividing resistor and a fourth voltage-dividing resistor; the first end of the fourth switch tube is connected to the connection end of the first switch tube and the second switch tube, and the second end of the fourth switch tube is connected to the control end of the first switch tube and the second switch tube; the first end of the third voltage-dividing resistor is connected to the first end of the fourth switch tube, the second end of the third voltage-dividing resistor is connected to the control end of the fourth switch tube and the first end of the fourth voltage-dividing resistor, and the second end of the fourth voltage-dividing resistor is connected to the first end of the third switch tube; wherein, when at least one of the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal is received, the fourth switch tube is disconnected; when the power-on wake-up signal, the network wake-up signal and the subsequent power supply signal are not received, the fourth switch tube is turned on to provide a discharge path for the decoupling capacitor.

7. The power supply circuit according to claim 6, characterized in that: The first switch tube and the second switch tube are PMOS tubes, the third switch tube is an NMOS tube, and the fourth switch tube is an NPN transistor; the drain of the first switch tube is connected to the positive electrode of the low-voltage power supply, the source of the first switch tube is connected to the source of the second switch tube, the first end of the decoupling capacitor, the first end of the first voltage-dividing resistor, and the first end of the third voltage-dividing resistor; the drain of the second switch tube is connected to the subsequent circuit; the drain of the third switch tube is connected to the gates of the first switch tube and the second switch tube, the source of the third switch tube is connected to the negative electrode of the low-voltage power supply, and the gate of the third switch tube is used to receive the power-on wake-up signal, the network wake-up signal, and the subsequent power supply signal; the collector of the fourth switch tube is connected to the source of the first switch tube and the second switch tube, the emitter of the fourth switch tube is connected to the gates of the first switch tube and the second switch tube, and the base of the fourth switch tube is connected to the second end of the third voltage-dividing resistor.

8. The power supply circuit according to claim 2, characterized in that: The wake-up circuit also includes a first diode, a second diode, a third diode and a current limiting resistor; the anode of the first diode is used to receive the power-on wake-up signal, the anode of the second diode is used to receive the network wake-up signal, the anode of the third diode is used to receive the subsequent power supply signal, the cathodes of the first diode, the second diode and the third diode are connected to the first end of the current limiting resistor, and the second end of the current limiting resistor is connected to the control end of the third switch tube.

9. A motor controller, characterized in that: A power supply circuit comprising any one of claims 1 to 8.

10. A vehicle, characterized in that: It comprises a motor and a motor controller as claimed in claim 9, wherein the motor controller is connected to the motor and is used to control the operation of the motor.

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