A power supply circuit for a motor controller and an electric vehicle having the power supply circuit

Abstract

The present invention provides a power supply circuit for a motor controller and an electric vehicle having the power supply circuit. The power supply circuit includes a low-voltage battery source and a power supply terminal, and further includes: a hysteresis comparison module that receives a reference voltage and a first power supply voltage, and outputs a high-level signal or a low-level signal as a first control signal; an inversion module that inverts the high-level signal or the low-level signal to form a second control signal; a switching control module that includes a power supply terminal, a first control unit, and a second control unit. The first control unit is connected to the low-voltage battery source and receives the second control signal; the second control unit is connected to a redundant power supply and receives the first control signal; when the second control signal or the first control signal is at a high level, the first control unit and the second control unit are alternatively turned on to supply power to the power supply terminal. After adopting the above technical solution, when a fault occurs in the low-voltage power supply circuit, the redundant power supply can be switched in immediately to ensure the safe operation of the motor controller.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control, and particularly to a power supply circuit for a motor controller and an electric vehicle having the power supply circuit. Background Art

[0002] In the motor controller of an electric vehicle, the electric energy of the low-voltage power supply circuit for powering the motor controller is converted from the vehicle's 12V / 24V battery through DC / DC conversion. In some emergency situations, when the low-voltage power supply battery stops supplying power or a fault occurs in the KL30 power line (such as short circuit and open circuit), the normal operation of the control circuit of the motor controller will be directly affected due to the lack of electric energy, thereby affecting the vehicle performance and driving safety, resulting in potential safety hazards during driving.

[0003] Therefore, a new power supply circuit for a motor controller is needed, which can add a redundant power supply on the basis of the original low-voltage power supply circuit and can be selectively switched in according to actual working conditions. Summary of the Invention

[0004] In order to overcome the above technical defects, the purpose of the present invention is to provide a power supply circuit for a motor controller and an electric vehicle having the power supply circuit, which can switch to the redundant power supply in the first time when the low-voltage power supply circuit fails, ensuring the safe operation of the motor controller.

[0005] The present invention discloses a power supply circuit for a motor controller, including a low-voltage battery source and a power supply terminal for supplying power to the motor controller. The power supply circuit further includes:

[0006] A hysteresis comparison module, which receives a reference voltage and a first supply voltage of the low-voltage battery source, and outputs a high-level signal or a low-level signal as a first control signal based on the comparison result of the reference voltage and the first supply voltage;

[0007] An inverting module, connected to the hysteresis comparison module, which inverts the high-level signal or the low-level signal to form a second control signal;

[0008] A switching control module, including a power supply terminal, a first control unit and a second control unit electrically connected to the power supply terminal. The first control unit is connected to the low-voltage battery source and receives the second control signal;

[0009] The second control unit is connected to a redundant power supply and receives the first control signal;

[0010] When the second control signal or the first control signal is at a high level, the first control unit and the second control unit are selectively turned on based on the second control signal and the first control signal to supply power to the power supply terminal.

[0011] Preferably, the hysteresis comparison module includes:

[0012] A first input terminal for receiving a first supply voltage;

[0013] A second input terminal for receiving a reference voltage;

[0014] A comparator, with its non-inverting input connected to the second input terminal to receive the reference voltage and its inverting input connected to the first input terminal to receive the first supply voltage. When the first supply voltage is less than the reference voltage, the output terminal of the comparator outputs a high-level signal; when the first supply voltage is greater than or equal to the reference voltage, the output terminal of the comparator outputs a low-level signal;

[0015] The inverting module includes:

[0016] A third input terminal connected to the output terminal of the comparator to receive a first control signal;

[0017] An inverter for inverting the first control signal to output a second control signal.

[0018] Preferably, the hysteresis comparison module further includes:

[0019] A resistor R1, with one end grounded;

[0020] A resistor R2, with one end grounded;

[0021] A resistor R3, with one end connected to the first input terminal and the other end connected to the other end of resistor R1;

[0022] A resistor R6, with one end connected to the second input terminal and the other end connected to the other end of resistor R2;

[0023] A resistor R4, with one end connected to the other end of resistor R1 and the other end connected to the inverting input;

[0024] A resistor R5, with one end connected to the other end of resistor R2 and the other end connected to the non-inverting input;

[0025] A capacitor C1 connected in parallel across resistor R1;

[0026] A capacitor C2 connected in parallel across resistor R2;

[0027] A voltage source VCC;

[0028] A capacitor C3, with one end grounded and the other end connected to the voltage source VCC;

[0029] A resistor R8, with one end connected to the output terminal and the other end connected to the voltage source VCC;

[0030] A resistor R9, with one end connected to the output terminal and the other end outputting the first control signal;

[0031] A resistor R10, with one end grounded and the other end connected to the other end of resistor R9;

[0032] The capacitor C4 has one end grounded and the other end connected to the other end of the resistor R9.

[0033] Preferably, the inverting module further includes:

[0034] A resistor R11, with one end receiving the first control signal and the other end connected to the inverter;

[0035] A capacitor C5, with one end grounded and the other end connected to the voltage source VCC;

[0036] A resistor R12, with one end connected to the output of the inverter and the other end outputting the second control signal;

[0037] A resistor R13, with one end grounded and the other end connected to the other end of the resistor R12;

[0038] A capacitor C6, with one end grounded and the other end connected to the other end of the resistor R12.

[0039] Preferably, the first control unit includes:

[0040] A triode Q9, with its base receiving the second control signal and its emitter grounded;

[0041] A PMOS transistor Q6, with its gate connected to the collector of the triode Q9, its source connected to the low-voltage battery source, and its drain connected to the power supply terminal;

[0042] The voltage source VCC is connected to the collector of the triode Q9;

[0043] The second control unit includes:

[0044] A triode Q8, with its base receiving the first control signal and its emitter grounded;

[0045] A PMOS transistor Q3, with its gate connected to the collector of the triode Q8, its source connected to the redundant power supply, and its drain connected to the power supply terminal;

[0046] The voltage source VCC is connected to the collector of the triode Q8.

[0047] Preferably, the first control unit further includes:

[0048] A triode Q7, with its base receiving the second control signal and its emitter grounded;

[0049] A PMOS transistor Q2, with its gate connected to the collector of the triode Q7, its drain connected to the drain of the PMOS transistor Q6, and its source connected to the power supply terminal;

[0050] The voltage source VCC is connected to the collector of the triode Q7;

[0051] The second control unit further includes:

[0052] The triode Q10 has its base receiving the first control signal and its emitter grounded.

[0053] The PMOS transistor Q5 has its gate connected to the collector of the triode Q10, its drain connected to the drain of the PMOS transistor Q3, and its source connected to the power supply terminal.

[0054] The voltage source VCC is connected to the collector of the triode Q10.

[0055] Preferably, the first control unit further includes:

[0056] The diode D1 has its negative electrode connected to the low-voltage battery source and its positive electrode grounded.

[0057] The capacitor C7 has one end connected to the low-voltage battery source and the other end grounded.

[0058] The inductor L1 has one end connected to the low-voltage battery source;

[0059] The capacitor C8 has one end connected to the other end of the inductor L1 and the other end grounded.

[0060] The PMOS transistor Q1 has its gate grounded through a resistor R14, its source connected to the source of the PMOS transistor Q6, and its drain connected to one end of the inductor L1;

[0061] The resistor R15 has one end connected to the gate of the PMOS transistor Q1 and the other end connected to the source of the PMOS transistor Q1.

[0062] The diode D2 has its positive electrode connected to the gate of the PMOS transistor Q1 and its negative electrode connected to the source of the PMOS transistor Q1.

[0063] The resistor R30 has one end connected to the gate of the PMOS transistor Q6 and the other end connected to the source of the PMOS transistor Q6.

[0064] The diode D13 has its positive electrode connected to the gate of the PMOS transistor Q6 and its negative electrode connected to the source of the PMOS transistor Q6.

[0065] The diode D3 has its positive electrode connected to the gate of the PMOS transistor Q2 and its negative electrode connected to the source of the PMOS transistor Q2.

[0066] The resistor R17 has one end connected to the gate of the PMOS transistor Q2 and the other end connected to the source of the PMOS transistor Q2.

[0067] The second control unit further includes:

[0068] The diode D12 has its negative electrode connected to the redundant power supply and its positive electrode grounded.

[0069] The capacitor C11 has one end connected to the redundant power supply and the other end grounded.

[0070] The inductance L2 has one end connected to the redundant power supply;

[0071] The capacitor C10 has one end connected to the other end of the inductance L2 and the other end grounded;

[0072] The PMOS transistor Q4 has its gate grounded through a resistor R29, its source connected to the source of the PMOS transistor Q3, and its drain connected to one end of the inductance L2;

[0073] The resistor R28 has one end connected to the base of the PMOS transistor Q4 and the other end connected to the source of the PMOS transistor Q4;

[0074] The diode D11 has its anode connected to the base of the PMOS transistor Q4 and its cathode connected to the source of the PMOS transistor Q4;

[0075] The resistor R24 has one end connected to the base of the PMOS transistor Q3 and the other end connected to the source of the PMOS transistor Q3;

[0076] The diode D8 has its anode connected to the base of the PMOS transistor Q3 and its cathode connected to the source of the PMOS transistor Q3;

[0077] The diode D6 has its anode connected to the base of the PMOS transistor Q5 and its cathode connected to the source of the PMOS transistor Q5;

[0078] The resistor R20 has one end connected to the base of the PMOS transistor Q5 and the other end connected to the source of the PMOS transistor Q5.

[0079] Preferably, the first control unit further includes:

[0080] The fourth input terminal is connected to the gate of the triode Q7 and receives a third control signal having the same level as the second control signal;

[0081] The fifth input terminal is connected to the gate of the triode Q9 and receives a third control signal having the same level as the second control signal;

[0082] The second control unit further includes:

[0083] The sixth input terminal is connected to the gate of the triode Q8 and receives a fourth control signal having the same level as the first control signal;

[0084] The seventh input terminal is connected to the gate of the triode Q10 and receives a fourth control signal having the same level as the first control signal.

[0085] The present invention also discloses an electric vehicle, including the power supply circuit as described above.

[0086] After adopting the above technical solutions, compared with the prior art, the following beneficial effects are achieved:

[0087] 1. The redundant power supply draws power from a high-voltage battery, and is converted into the required low-voltage power supply (12V / 24V) through an isolated DC / DC and connected to the power supply circuit of the motor controller. In the case of a failure in the original low-voltage power supply circuit, it can be used as a backup power supply.

[0088] 2. The switching switch control of the redundant power supply circuit adopts a redundant method of software control and hardware control, which can improve the reliability and stability of the circuit.

[0089] 3. The switching-in method of the redundant power supply adopts a hysteresis circuit, which increases the anti-interference and anti-disturbance capabilities of the circuit.

[0090] 4. When the redundant power supply works, it can avoid current backflow into the low-voltage power supply circuit.

[0091] 5. When the low-voltage battery power supply circuit works, it can avoid current backflow into the redundant power supply circuit.

[0092] 6. The low-voltage battery source and the redundant power supply adopt MOS to prevent reverse connection, and the power supply voltage has no loss and small loss, improving the power supply efficiency.

[0093] 7. The low-voltage battery source and the redundant power supply adopt MOS to prevent backflow, and the power supply voltage has no loss and small loss, improving the power supply efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Figure 1 It is a circuit topology design diagram of the hysteresis comparison module in a preferred embodiment of the present invention;

[0095] Figure 2 It is a circuit topology design diagram of the inverting module in a preferred embodiment of the present invention;

[0096] Figure 3 It is a circuit topology design diagram of the switching control module in a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0097] The advantages of the present invention will be further elaborated below in conjunction with the drawings and specific embodiments.

[0098] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0099] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms "a", "the", and "said" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0100] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0101] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0102] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two elements. It may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms may be understood according to specific circumstances.

[0103] In the subsequent description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of describing the present invention, and they do not have a specific meaning themselves. Therefore, "module" and "component" can be used interchangeably.

[0104] The present invention discloses a power supply circuit for a motor controller, including a low-voltage battery source and a power supply terminal. The low-voltage battery source provides electrical energy to the power supply terminal through the power supply circuit, and then supplies power to the motor controller through the power supply terminal. In order to enable the power supply circuit to still provide electrical energy to the power supply terminal when the low-voltage battery source fails, in this embodiment, the power supply circuit further includes:

[0105] - a hysteresis comparison module

[0106] The hysteresis comparison module is used to determine whether a low-voltage battery source fails. Specifically, the hysteresis comparison module receives a reference voltage and a first supply voltage of the low-voltage battery source, and compares the two. Due to the hysteresis characteristic and anti-interference function of the hysteresis comparison module, an inverting input hysteresis comparator with double threshold values is formed. The two threshold voltages are VH and VL respectively. When the input changes in one direction, the output only jumps once. When the input decreases from large to small and drops below the lower threshold voltage VL, the output flips to a high level. When the input increases from small to large and exceeds the higher threshold voltage VH, the output flips to a low level. When between the two threshold voltages VL and VH, the output remains in its original state. Thus, it can be understood that when the reference voltage is less than the first supply voltage, it indicates that the low-voltage battery source is normal and should supply power to the power supply terminal; while when the reference voltage is greater than the first supply voltage, it indicates that the low-voltage battery source may fail and the voltage value is small, then power should be supplied to the power supply terminal by other power supply terminals. Therefore, according to the numerical comparison result of the reference voltage and the first supply voltage, the hysteresis comparison module will output a high-level signal or a low-level signal as the first control signal, thereby indicating the comparison result of the reference voltage and the first supply voltage. In a preferred embodiment, generally, the first supply voltage of the low-voltage battery source is higher than 10V under normal circumstances. Once a failure occurs, the voltage value will drop significantly. When it drops below 7V, the power supply of the low-voltage battery source is disconnected and the redundant power supply is put into power supply, so that seamless connection can be achieved and the motor controller can maintain its previous working state without being affected. Based on the above configuration, it is possible to prevent the instability of the control signal caused by the failure of the first supply voltage and maintain the output stability of the first control signal.

[0107] - Inverting module

[0108] Downstream of the hysteresis comparison module, there is an inverting module connected. After receiving the first control signal, it inverts it to form a second control signal. Thus, under this configuration, there are two control signals, namely the first control signal and the second control signal that are inverted with each other.

[0109] - Switching control module

[0110] The power supply terminal is located within the switching control module. On both sides of the power supply terminal, a first control unit and a second control unit are respectively provided, and either of the two power supplies is selectively controlled to conduct power supply. Specifically, the first control unit is connected to the low-voltage battery source to receive the second control signal, while the second control unit is connected to the redundant power supply (the redundant power supply is the low-voltage power supply required after the high-voltage battery takes power and is isolated by a DC / DC converter, such as 12V access), and receives the first control signal. When the first control signal and the second control signal are in antiphase, one of them must be at a high level and the other at a low level. When the first control signal is at a high level, the second control unit conducts to supply power to the power supply terminal. Conversely, when the second control signal is at a high level, the first control unit conducts to supply power to the power supply terminal.

[0111] With the above configuration, the power supply of the motor controller can be provided by either the low-voltage battery source or the redundant power supply at any time and under any circumstances, without power loss affecting the vehicle performance and driving safety, resulting in potential safety hazards during driving.

[0112] Refer to Figure 1 and Figure 2 , in a preferred embodiment, the hysteresis comparison module includes a first input terminal, a second input terminal, and a comparator. The first input terminal is connected to the low-voltage battery source (Vin_BAT) to receive the first supply voltage. The second input terminal is connected to a reference voltage source (V_REF) to receive the reference voltage. The positive-phase input of the comparator is connected to the second input terminal to receive the reference voltage, and the negative-phase input is connected to the first input terminal to receive the first supply voltage. When the first supply voltage is less than the threshold voltage V L , the output terminal of the comparator outputs a high-level signal. When the first supply voltage is greater than the threshold voltage V H , the output terminal of the comparator outputs a low-level signal. The electrical energy of the comparator is provided by a voltage source VCC. On the other hand, the inverting module includes a third input terminal and an inverter. The third input terminal is connected to the output terminal of the comparator of the hysteresis comparison module to receive the first control signal. After the first control signal is inverted by the inverter, the second control signal is output.

[0113] Continue to refer to Figure 1 and Figure 2, the hysteresis comparison module further includes the following electrical components: resistor R1 with one end grounded; resistor R2 with one end grounded; resistor R3 with one end connected to the first input terminal and the other end connected to the other end of resistor R1; resistor R6 with one end connected to the second input terminal and the other end connected to the other end of resistor R2; resistor R4 with one end connected to the other end of resistor R1 and the other end connected to the inverting input; resistor R5 with one end connected to the other end of resistor R2 and the other end connected to the non-inverting input; capacitor C1 connected in parallel across resistor R1; capacitor C2 connected in parallel across resistor R2; voltage source VCC; capacitor C3 with one end grounded and the other end connected to voltage source VCC; resistor R8 with one end connected to the output terminal and the other end connected to voltage source VCC; resistor R9 with one end connected to the output terminal and the other end outputting the first control signal; resistor R10 with one end grounded and the other end connected to the other end of resistor R9; capacitor C4 with one end grounded and the other end connected to the other end of resistor R9. Through the RC circuit formed by the above resistor R1 and capacitor C1, and the RC circuit formed by resistor R2 and capacitor C2, the first supply voltage and the reference voltage can be filtered, and after being divided by resistors R4 and R5 (to prevent overcurrent), they are input to the comparator. Resistor R10 and capacitor C4 also form an RC circuit for filtering. Resistor R8 and voltage source VCC are also connected to the non-inverting input of the comparator through a resistor R7 and a diode. Through this feedback mechanism, when the output terminal outputs a low level, it can be fed back to the non-inverting input to ensure that the output terminal continuously outputs a low level.

[0114] For the inverting module, it further includes: resistor R11 with one end receiving the first control signal and the other end connected to the inverter; capacitor C5 with one end grounded and the other end connected to voltage source VCC; resistor R12 with one end connected to the output of the inverter and the other end outputting the second control signal; resistor R13 with one end grounded and the other end connected to the other end of resistor R12; capacitor C6 with one end grounded and the other end connected to the other end of resistor R12. The electrical energy of the inverter is provided by voltage source VCC and filtered by this capacitor C5. Similarly, resistor R13 and capacitor C6 form an RC circuit for filtering.

[0115] For the switching control module, to achieve the selection of the first supply voltage and the redundant power supply, refer to Figure 3, the first control unit and the second control unit are configured as follows: The first control unit includes: a triode Q9, whose base receives the second control signal and whose emitter is grounded; a PMOS transistor Q6, whose gate is connected to the collector of the triode Q9, whose source is connected to the low-voltage battery source, and whose drain is connected to the power supply terminal; a voltage source VCC, which is connected to the collector of the triode Q9; The second control unit includes: a triode Q8, whose base receives the first control signal and whose emitter is grounded; a PMOS transistor Q3, whose gate is connected to the collector of the triode Q8, whose source is connected to the redundant power supply, and whose drain is connected to the power supply terminal; a voltage source VCC, which is connected to the collector of the triode Q8. With the above configuration, when the first supply voltage is higher than the reference voltage, the first control signal is at a low level, and after inversion, the second control signal is at a high level. After being input to the base of the triode Q9, the triode Q9 conducts, causing the gate of the PMOS transistor Q6 to be connected to the ground terminal to receive a low level, thereby causing the PMOS transistor Q6 to conduct and establishing a power supply circuit between the low-voltage battery source and the power supply terminal. On the other hand, when the base of the triode Q8 receives the first control signal at a high level, the triode Q8 is cut off, causing the gate of the PMOS transistor Q3 to be connected to the voltage source VCC, thereby receiving a high level, and the PMOS transistor Q3 is turned off, and a power supply circuit between the redundant power supply and the power supply terminal is not established. Conversely, when the first supply voltage is lower than the reference voltage, the first control signal is at a high level, and after inversion, the second control signal is at a low level. After being input to the base of the triode Q9, the triode Q9 is cut off, causing the gate of the PMOS transistor Q6 to be connected to the voltage source VCC to receive a high level, thereby causing the PMOS transistor Q6 to be turned off, and a power supply circuit between the low-voltage battery source and the power supply terminal is not established. On the other hand, when the base of the triode Q8 receives the first control signal at a low level, the triode Q8 conducts, causing the gate of the PMOS transistor Q3 to be connected to the ground terminal, thereby receiving a low level, and the PMOS transistor Q3 conducts, establishing a power supply circuit between the redundant power supply and the power supply terminal, so as to select one of the low-voltage battery source and the redundant power supply to supply power to the power supply terminal.

[0116] Further, to prevent reverse power flow from the low-voltage battery source or redundant power supply to the other side's power supply circuit, the first control unit further includes: a triode Q7, whose base receives the second control signal and whose emitter is grounded; a PMOS transistor Q2, whose gate is connected to the collector of the triode Q7, whose drain is connected to the drain of the PMOS transistor Q6, and whose source is connected to the power supply terminal; a voltage source VCC is connected to the collector of the triode Q7; the second control unit further includes: a triode Q10, whose base receives the first control signal and whose emitter is grounded; a PMOS transistor Q5, whose gate is connected to the collector of the triode Q10, whose drain is connected to the drain of the PMOS transistor Q3, and whose source is connected to the power supply terminal; a voltage source VCC is connected to the collector of the triode Q10. With the above configuration, when the first supply voltage is higher than the reference voltage, the first control signal is at a low level. After inversion, the second control signal becomes a high level. After being input to the base of the triode Q7, the triode Q7 conducts, causing the gate of the PMOS transistor Q2 to be connected to the ground terminal to receive a low level, thereby causing the PMOS transistor Q2 to conduct and establishing a power supply circuit between the low-voltage battery source and the power supply terminal. On the other hand, when the base of the triode Q8 receives the first control signal at a high level, the triode Q10 is cut off, causing the gate of the PMOS transistor Q5 to be connected to the voltage source VCC, thereby receiving a high level, and the PMOS transistor Q5 is turned off, not establishing a power supply circuit between the redundant power supply and the power supply terminal. By means of the body diode of the PMOS transistor Q5, the power supply electric energy of the low-voltage battery source can be prevented from being transmitted into the second control unit. Conversely, when the first supply voltage is lower than the reference voltage, the first control signal is at a high level. After inversion, the second control signal becomes a low level. After being input to the base of the triode Q7, the triode Q7 is cut off, causing the gate of the PMOS transistor Q2 to be connected to the voltage source VCC to receive a high level, thereby causing the PMOS transistor Q2 to be turned off, not establishing a power supply circuit between the low-voltage battery source and the power supply terminal. On the other hand, when the base of the triode Q10 receives the first control signal at a low level, the triode Q10 conducts, causing the gate of the PMOS transistor Q5 to be connected to the ground terminal, thereby receiving a low level, and the PMOS transistor Q5 conducts, establishing a power supply circuit between the redundant power supply and the power supply terminal, so as to select one of the low-voltage battery source and the redundant power supply to supply power to the power supply terminal. By means of the body diode of the PMOS transistor Q2, the power supply electric energy of the redundant power supply can be prevented from being transmitted into the first control unit.

[0117] Further, the first control unit further includes: a diode D1 (which can be a zener diode), with its negative electrode connected to the low-voltage battery source and its positive electrode grounded; a capacitor C7, with one end connected to the low-voltage battery source and the other end grounded; an inductor L1, with one end connected to the low-voltage battery source; a capacitor C8, with one end connected to the other end of the inductor L1 and the other end grounded; a PMOS transistor Q1, with its gate grounded through a resistor R14, its source connected to the source of the PMOS transistor Q6, and its drain connected to one end of the inductor L1; a resistor R15, with one end connected to the gate of the PMOS transistor Q1 and the other end connected to the source of the PMOS transistor Q1; a diode D2, with its positive electrode connected to the gate of the PMOS transistor Q1 and its negative electrode connected to the source of the PMOS transistor Q1; a resistor R30, with one end connected to the gate of the PMOS transistor Q6 and the other end connected to the source of the PMOS transistor Q6; a diode D13, with its positive electrode connected to the gate of the PMOS transistor Q6 and its negative electrode connected to the source of the PMOS transistor Q6; a diode D3, with its positive electrode connected to the gate of the PMOS transistor Q2 and its negative electrode connected to the source of the PMOS transistor Q2; a resistor R17, with one end connected to the gate of the PMOS transistor Q2 and the other end connected to the source of the PMOS transistor Q2; the second control unit further includes: a diode D12, with its negative electrode connected to the redundant power supply and its positive electrode grounded; a capacitor C11, with one end connected to the redundant power supply and the other end grounded; an inductor L2, with one end connected to the redundant power supply; a capacitor C10, with one end connected to the other end of the inductor L2 and the other end grounded; a PMOS transistor Q4, with its gate grounded through a resistor R29, its source connected to the source of the PMOS transistor Q3, and its drain connected to one end of the inductor L2; a resistor R28, with one end connected to the base of the PMOS transistor Q4 and the other end connected to the source of the PMOS transistor Q4; a diode D11, with its positive electrode connected to the base of the PMOS transistor Q4 and its negative electrode connected to the source of the PMOS transistor Q4; a resistor R24, with one end connected to the base of the PMOS transistor Q3 and the other end connected to the source of the PMOS transistor Q3; a diode D8, with its positive electrode connected to the base of the PMOS transistor Q3 and its negative electrode connected to the source of the PMOS transistor Q3; a diode D6, with its positive electrode connected to the base of the PMOS transistor Q5 and its negative electrode connected to the source of the PMOS transistor Q5; a resistor R20, with one end connected to the base of the PMOS transistor Q5 and the other end connected to the source of the PMOS transistor Q5. The diode D1, the capacitor C7 and the inductor L1 form a filtering circuit, and the diode D12, the capacitor C11 and the inductor L2 also form a filtering circuit. The resistor 15 and the diode D2, the resistor R30 and the diode D13, the resistor R17 and the diode D3, the resistor R24 and the diode D8, the resistor R28 and the diode D11, the resistor R20 and the diode D6 form clamping circuits to keep the current waveform unchanged.

[0118] Furthermore, to ensure the alternative control of the power supply terminal at any time, multiple input terminals are added and used as the input terminals for software control. Then, the previous input terminal that receives the first control signal and the second control signal is a hardware input terminal (implemented by a circuit). Specifically, the first control unit further includes: a fourth input terminal connected to the gate of the triode Q7 to receive a third control signal having the same level as the second control signal; a fifth input terminal connected to the gate of the triode Q9 to receive a third control signal having the same level as the second control signal; the second control unit further includes: a sixth input terminal connected to the gate of the triode Q8 to receive a fourth control signal having the same level as the first control signal; a seventh input terminal connected to the gate of the triode Q10 to receive a fourth control signal having the same level as the first control signal.

[0119] The power supply circuit with any of the above configurations can be applied to an electric vehicle.

[0120] It should be noted that the embodiments of the present invention have better implementability and do not impose any form of limitation on the present invention. Any person skilled in the art may use the disclosed technical content to modify or transform it into an equivalent effective embodiment. However, as long as it does not depart from the technical solution of the present invention, any modification, equivalent change, or modification made to the above embodiments based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A power supply circuit for a motor controller, comprising a low-voltage battery source and a power supply terminal for supplying power to the motor controller, characterized in that, The power supply circuit further includes: a hysteresis comparison module that receives a reference voltage and a first power supply voltage of the low-voltage battery source, and outputs a high-level signal or a low-level signal as a first control signal based on the comparison result of the reference voltage and the first power supply voltage; an inverter module connected to the hysteresis comparison module to invert the high-level signal or the low-level signal to form a second control signal; a switching control module including the power supply terminal, a first control unit and a second control unit electrically connected to the power supply terminal, the first control unit being connected to the low-voltage battery source and receiving the second control signal; the second control unit is connected to a redundant power supply and receives the first control signal; when the second control signal or the first control signal is at a high level, the first control unit and the second control unit are alternately turned on based on the second control signal and the first control signal to supply power to the power supply terminal; The first control unit includes: a triode Q9, the base of which receives the second control signal and the emitter of which is grounded; a PMOS transistor Q6, the gate of which is connected to the collector of the triode Q9, the source of which is connected to the low-voltage battery source, and the drain of which is connected to the power supply terminal; a voltage source VCC connected to the collector of the triode Q9; The second control unit includes: a triode Q8, the base of which receives the first control signal and the emitter of which is grounded; a PMOS transistor Q3, the gate of which is connected to the collector of the triode Q8, the source of which is connected to the redundant power supply, and the drain of which is connected to the power supply terminal; a voltage source VCC connected to the collector of the triode Q8; The first control unit further includes: a triode Q7, the base of which receives the second control signal and the emitter of which is grounded; a PMOS transistor Q2, the gate of which is connected to the collector of the triode Q7, the drain of which is connected to the drain of the PMOS transistor Q6, and the source of which is connected to the power supply terminal; a voltage source VCC is connected to the collector of the triode Q7; The second control unit further includes: a triode Q10, the base of which receives the first control signal and the emitter of which is grounded; a PMOS transistor Q5, the gate of which is connected to the collector of the triode Q10, the drain of which is connected to the drain of the PMOS transistor Q3, and the source of which is connected to the power supply terminal; a voltage source VCC is connected to the collector of the triode Q10.

2. The power supply circuit according to claim 1, wherein the hysteresis comparison module includes: a first input terminal for receiving the first power supply voltage; a second input terminal for receiving the reference voltage; a comparator, the non-inverting input of which is connected to the second input terminal to receive the reference voltage, and the inverting input of which is connected to the first input terminal to receive the first power supply voltage. When the first power supply voltage is less than the reference voltage, the output terminal of the comparator outputs a high-level signal. When the first power supply voltage is greater than or equal to the reference voltage, the output terminal of the comparator outputs a low-level signal; The inverter module includes: a third input terminal connected to the output terminal of the comparator to receive the first control signal; an inverter for inverting the first control signal to output a second control signal.

3. The power supply circuit according to claim 2, wherein the hysteresis comparison module further includes: a resistor R1, one end of which is grounded; a resistor R2, one end of which is grounded; a resistor R3, one end of which is connected to the first input terminal, and the other end is connected to the other end of the resistor R1; a resistor R6, one end of which is connected to the second input terminal, and the other end is connected to the other end of the resistor R2; a resistor R4, one end of which is connected to the other end of the resistor R1, and the other end is connected to the negative-phase input; a resistor R5, one end of which is connected to the other end of the resistor R2, and the other end is connected to the positive-phase input; a capacitor C1, connected in parallel across the resistor R1; a capacitor C2, connected in parallel across the resistor R2; a voltage source VCC; a capacitor C3, one end of which is grounded, and the other end is connected to the voltage source VCC; a resistor R8, one end of which is connected to the output terminal, and the other end is connected to the voltage source VCC; a resistor R9, one end of which is connected to the output terminal, and the other end outputs the first control signal; a resistor R10, one end of which is grounded, and the other end is connected to the other end of the resistor R9; a capacitor C4, one end of which is grounded, and the other end is connected to the other end of the resistor R9.

4. The power supply circuit according to claim 3, wherein the inverting module further includes: a resistor R11, one end of which receives the first control signal, and the other end is connected to the inverter; a capacitor C5, one end of which is grounded, and the other end is connected to the voltage source VCC; a resistor R12, one end of which is connected to the output of the inverter, and the other end outputs the second control signal; a resistor R13, one end of which is grounded, and the other end is connected to the other end of the resistor R12; a capacitor C6, one end of which is grounded, and the other end is connected to the other end of the resistor R12.

5. The power supply circuit according to claim 1, wherein the first control unit further includes: a diode D1, the negative electrode of which is connected to the low-voltage battery source, and the positive electrode is grounded; a capacitor C7, one end of which is connected to the low-voltage battery source, and the other end is grounded; an inductor L1, one end of which is connected to the low-voltage battery source; a capacitor C8, one end of which is connected to the other end of the inductor L1, and the other end is grounded; a PMOS transistor Q1, the gate of which is grounded through a resistor R14, the source of which is connected to the source of the PMOS transistor Q6, and the drain is connected to one end of the inductor L1; a resistor R15, one end of which is connected to the gate of the PMOS transistor Q1, and the other end is connected to the source of the PMOS transistor Q1; a diode D2, the positive electrode of which is connected to the gate of the PMOS transistor Q1, and the negative electrode is connected to the source of the PMOS transistor Q1; a resistor R30, one end of which is connected to the gate of the PMOS transistor Q6, and the other end is connected to the source of the PMOS transistor Q6; a diode D13, the positive electrode of which is connected to the gate of the PMOS transistor Q6, and the negative electrode is connected to the source of the PMOS transistor Q6; a diode D3, the positive electrode of which is connected to the gate of the PMOS transistor Q2, and the negative electrode is connected to the source of the PMOS transistor Q2; a resistor R17, one end of which is connected to the gate of the PMOS transistor Q2, and the other end is connected to the source of the PMOS transistor Q2; the second control unit further includes: Diode D12, with its negative electrode connected to the redundant power supply and its positive electrode grounded; Capacitor C11, with one end connected to the redundant power supply and the other end grounded; Inductor L2, with one end connected to the redundant power supply; Capacitor C10, with one end connected to the other end of the inductor L2 and the other end grounded; PMOS transistor Q4, with its gate grounded through a resistor R29, its source connected to the source of the PMOS transistor Q3, and its drain connected to one end of the inductor L2; Resistor R28, with one end connected to the base of the PMOS transistor Q4 and the other end connected to the source of the PMOS transistor Q4; Diode D11, with its positive electrode connected to the base of the PMOS transistor Q4 and its negative electrode connected to the source of the PMOS transistor Q4; Resistor R24, with one end connected to the base of the PMOS transistor Q3 and the other end connected to the source of the PMOS transistor Q3; Diode D8, with its positive electrode connected to the base of the PMOS transistor Q3 and its negative electrode connected to the source of the PMOS transistor Q3; Diode D6, with its positive electrode connected to the base of the PMOS transistor Q5 and its negative electrode connected to the source of the PMOS transistor Q5; Resistor R20, with one end connected to the base of the PMOS transistor Q5 and the other end connected to the source of the PMOS transistor Q5.

6. The power supply circuit according to claim 5, wherein The first control unit further includes: A fourth input terminal, connected to the gate of the triode Q7, for receiving a third control signal having the same level as the second control signal; A fifth input terminal, connected to the gate of the triode Q9, for receiving a third control signal having the same level as the second control signal; The second control unit further includes: A sixth input terminal, connected to the gate of the triode Q8, for receiving a fourth control signal having the same level as the first control signal; A seventh input terminal, connected to the gate of the triode Q10, for receiving a fourth control signal having the same level as the first control signal.

7. An electric vehicle, characterized in that, Including the power supply circuit according to any one of claims 1-6.

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