Motor drive protection circuit and energy storage power supply

Abstract

The application relates to a motor drive protection circuit and an energy storage power supply. The circuit acquires the DC power supply voltage in real time through an under-voltage protection module, and cuts off the drive of the motor by outputting a first signal when the DC power supply voltage is lower than the reference voltage; and samples the motor working current through an overcurrent detection module, and outputs a second signal to stop driving the target motor when the working voltage corresponding to the working current exceeds the reference voltage, so that the target motor is stopped in time before the low-efficiency operation caused by under-voltage or the overheating damage caused by overcurrent, and the motor drive module is directly controlled through the hardware signal interaction between the modules, so that the response speed is fast. Meanwhile, the motor drive module normally drives the target motor according to the PWM signal when there is no abnormal signal, and triggers protection only when an abnormality is detected, so that the normal work of the target motor is not affected, and the target motor and the circuit can be protected in time when the power supply is abnormal.

Description

Technical Field

[0001] This application relates to circuit protection technology, specifically to a motor drive protection circuit and an energy storage power supply. Background Technology

[0002] DC motors, due to their simple structure and excellent speed regulation performance, are widely used in many fields such as automobiles, industrial control, automation equipment, and aerospace. Therefore, their power supply scenarios are also complex and diverse. For example, in scenarios using DC power supplies, they are easily affected by factors such as DC power attenuation and load fluctuations, leading to unstable power supply voltage or undervoltage conditions. If the motor frequently operates under undervoltage conditions, not only will insufficient torque affect its working efficiency, but abnormal current will also cause overheating of the windings, potentially damaging the motor directly. Furthermore, unstable power supply voltage can also cause instantaneous large currents, leading to overcurrent phenomena, accelerating the wear and tear on internal components, and further shortening the motor's lifespan. Utility Model Content

[0003] The embodiments of this application mainly address the technical problem that unstable DC power supply can easily damage motors.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is as follows: a motor drive protection circuit is provided, including an undervoltage protection module, an overcurrent detection module, and a motor drive module; the undervoltage protection module is connected to a DC power supply and the motor drive module respectively, the overcurrent detection module is connected to a target motor and the motor drive module respectively, and the motor drive module is electrically connected to the target motor, wherein the DC power supply is used to supply power to the target motor; the undervoltage protection module is used to output a first signal to the motor drive module when the voltage of the DC power supply is less than a reference voltage; the overcurrent detection module is used to sample the operating current of the target motor, and output a second signal to the motor drive module when the operating voltage corresponding to the operating current is greater than the reference voltage; the motor drive module is used to receive a PWM signal, and drive the target motor to work according to the PWM signal when neither the first signal nor the second signal is received; and, when the first signal or the second signal is received, stop driving the target motor to stop the target motor from working.

[0005] In some embodiments, the motor drive module includes a switch Q3, a resistor R5, an AND gate U1C, a resistor R7, and a switch Q2; the first terminal of the switch Q3 is connected to the first input terminal of the AND gate U1C, the second terminal of the switch Q3 is grounded, the control terminal of the switch Q3 is connected to the undervoltage protection module and the overcurrent detection module, the first input terminal of the AND gate U1C receives the supply voltage through the resistor R5, the second input terminal of the AND gate U1C is used to receive the PWM signal, the output terminal of the AND gate U1C is connected to the first terminal of the resistor R7, the second terminal of the resistor R7 is connected to the control terminal of the switch Q2, the first terminal of the switch Q2 is connected to the target motor, and the second terminal of the switch Q2 is grounded.

[0006] In some embodiments, the motor drive module further includes an isolation amplifier unit, which is connected to the output terminal of the AND gate U1C and the first terminal of the resistor R7 respectively. The isolation amplifier unit is used to drive the switch Q2 to work according to the PWM signal when the switch Q3 does not receive the first signal and the second signal, so as to make the target motor work, and to control the switch Q2 to remain in the off state when the switch Q3 receives the first signal or the second signal, so as to make the target motor stop working.

[0007] In some embodiments, the isolation amplification unit includes a resistor R8, a switch Q1, and a switch Q4. The first terminal of the switch Q1 is used to receive the supply voltage, the second terminal of the switch Q1 is connected to the first terminal of the switch Q4, the control terminal of the switch Q1 is connected to the output terminal of the AND gate U1C through the resistor R8, the first terminal of the switch Q4 is connected to the first terminal of the resistor R7, the second terminal of the switch Q4 is grounded, and the control terminal of the switch Q4 is connected to the control terminal of the switch Q1.

[0008] In some embodiments, the undervoltage protection module includes a comparator U2B, resistors R2, R3, and R4, and a diode D1. The first input terminal of the comparator U2B is used to receive the reference voltage. The second input terminal of the comparator U2B is connected to a DC power supply through the resistor R2. The second input terminal of the comparator U2B is grounded through the resistor R4. The output terminal of the comparator U2B is connected to the anode of the diode D1 through the resistor R3. The cathode of the diode D1 is connected to the control terminal of the switching transistor Q3.

[0009] In some embodiments, the overcurrent detection module includes a comparator U2C, a resistor R9, a sampling resistor R10, and a diode D2. The first end of the sampling resistor R10 is connected to the target motor, and the second end of the sampling resistor R10 is grounded. The first input terminal of the comparator U2C is used to receive the reference voltage, and the second input terminal of the comparator U2C is connected to the first end of the sampling resistor R10. The output terminal of the comparator U2C is connected to the anode of the diode D2 through the resistor R9, and the cathode of the diode D2 is connected to the control terminal of the switching transistor Q3.

[0010] In some embodiments, the circuit further includes a reference voltage module, which is connected to the DC power supply, the undervoltage protection module, and the overcurrent detection module, respectively; the reference voltage module is used to provide a constant reference voltage to the undervoltage protection module and the overcurrent detection module in conjunction with the DC power supply.

[0011] In some embodiments, the reference voltage module includes resistors R12 and R13, a Zener diode DZ1, resistors R1 and R11; the first end of resistor R12 is connected to the DC power supply, the second end of resistor R12 is connected to the first end of resistor R14 through resistor R13, the second end of resistor R14 is grounded, the cathode of Zener diode DZ1 is connected to the first end of resistor R14, the anode of Zener diode DZ1 is connected to the second end of resistor R14, the first end of resistor R1 is connected to the first end of resistor R14, the second end of resistor R1 is grounded through resistor R11, and the second end of resistor R1 is connected to the undervoltage protection module and the overcurrent detection module.

[0012] In some embodiments, the first terminal of the resistor R14 is connected to the first input terminal of the AND gate U1C via the resistor R5.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide an energy storage device, including the motor drive protection circuit described above.

[0014] Unlike related technologies, this application provides a motor drive protection circuit and an energy storage power supply. The circuit includes an undervoltage protection module, an overcurrent detection module, and a motor drive module. The undervoltage protection module is connected to both a DC power supply and the motor drive module. The overcurrent detection module is connected to both a target motor and the motor drive module. The motor drive module is electrically connected to the target motor. The DC power supply powers the target motor. The undervoltage protection module outputs a first signal to the motor drive module when the voltage of the DC power supply is less than a reference voltage. The overcurrent detection module samples the operating current of the target motor and outputs a second signal to the motor drive module when the operating voltage corresponding to the operating current is greater than the reference voltage. The motor drive module receives a PWM signal and drives the target motor according to the PWM signal when neither the first nor the second signal is received. Upon receiving either the first or the second signal, the module stops driving the target motor to stop it from operating. This circuit acquires the DC power supply voltage in real time through an undervoltage protection module and cuts off the motor drive by outputting a first signal when the DC power supply voltage is lower than the reference voltage. It also samples the motor operating current through an overcurrent detection module and outputs a second signal to stop driving the target motor when the operating voltage corresponding to the operating current exceeds the reference voltage. This dual protection ensures that the target motor stops in time before inefficient operation due to undervoltage or overheating damage caused by overcurrent. Furthermore, the motor drive module is directly controlled through hardware signal interaction between modules, eliminating the need for software judgment and resulting in faster response. Simultaneously, the motor drive module drives the target motor normally according to the PWM signal when there are no abnormal signals, triggering protection only when an abnormality is detected. This ensures that the normal operation of the target motor is not affected, while also providing rapid response in case of power supply abnormalities, thus protecting the target motor and the circuit. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating an application scenario of a motor drive protection circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a motor drive protection circuit provided in an embodiment of this application. Detailed Implementation

[0016] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements. The terms "first," "second," etc., used in this specification are for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0018] As DC motors become increasingly widely used, their power supply environments are also becoming more diverse. If the power supply to a DC motor becomes unstable due to load fluctuations or other reasons, a sudden surge in current may occur, affecting the normal operation of the DC motor. If the output voltage of the DC power supply is too low, the DC motor may operate in an undervoltage state, which can easily lead to motor damage.

[0019] Please combine Figure 1 This application provides a motor drive protection circuit that can protect the target motor when a DC power supply is supplying power to it. Figure 1 This is a schematic diagram of the application scenario of the circuit. As shown in the figure, the motor drive protection circuit 100 includes an undervoltage protection module 11, an overcurrent detection module 12, and a motor drive module 13. The undervoltage protection module 11 is connected to the DC power supply 30 and the motor drive module 13, respectively. The overcurrent detection module 12 is connected to the target motor 20 and the motor drive module 13, respectively. The motor drive module 13 is electrically connected to the target motor 20. The DC power supply 30 supplies power to the target motor 20.

[0020] The undervoltage protection module 11 outputs a first signal to the motor drive module 13 when the voltage of the DC power supply 30 is less than the reference voltage. The overcurrent detection module 12 samples the operating current of the target motor 20 and outputs a second signal to the motor drive module 13 when the operating voltage corresponding to the operating current is greater than the reference voltage. The motor drive module 13 receives a PWM signal, represented as DC_PWM in the figure, and drives the target motor 20 to work according to the PWM signal when neither the first nor the second signal is received; and stops driving the target motor 20 to stop working when either the first or the second signal is received.

[0021] Based on this, if the DC power supply 30 provides power to the target motor 20 normally, the motor drive module 13 will drive the target motor 20 normally only according to the PWM signal. If the DC power supply 30 has low power, causing the supplied voltage to drop below the reference voltage, the undervoltage protection module will immediately output a first signal to the motor drive module 13, causing the motor drive module 13 to stop driving the target motor 20, thus preventing the target motor 20 from operating in an undervoltage state and thereby avoiding damage to the target motor 20. If, during the operation of the target motor 20, the operating current of the motor increases due to unstable power supply voltage or other reasons, and the overcurrent detection module 12 detects that the operating voltage corresponding to the operating current is greater than the reference voltage, it will immediately output a second signal to the motor drive module 13, causing the motor drive module 13 to stop driving the target motor 20, thus preventing the target motor 20 from being burned out by the large current. Therefore, the motor drive protection circuit 100 provided in this solution sets the motor drive module 13 to drive the target motor normally according to the PWM signal when there is no abnormal signal, and triggers protection only when an abnormality is detected. This ensures that the normal operation of the target motor is not affected, and can respond quickly when the power supply is abnormal. The dual protection of the undervoltage protection module 11 and the overcurrent detection module 12 ensures that the target motor 20 stops in time before inefficient operation caused by undervoltage or overheating damage caused by overcurrent. Moreover, the motor drive module 13 is directly controlled through hardware signal interaction between modules, without relying on software judgment, resulting in a faster response speed.

[0022] Please combine Figure 2 , Figure 2 This is a schematic diagram of the circuit structure of a motor drive protection circuit provided in an embodiment of this application. In some embodiments, the motor drive module 13 includes a switch Q3, a resistor R5, an AND gate U1C, a resistor R7, and a switch Q2. Figure 2 As shown, the first terminal Q3_3 of switch Q3 is connected to the first input terminal U1C_9 of AND gate U1C, and the second terminal Q3_2 of switch Q3 is grounded, represented as GND_BAT in the figure. The control terminal Q3_1 of switch Q3 is connected to the undervoltage protection module 11 and the overcurrent detection module 12. The first input terminal U1C_9 of AND gate U1C receives the supply voltage through resistor R5, represented as +5V in the figure. The second input terminal U1C_10 of AND gate U1C receives the PWM signal, i.e., DC_PWM. The output terminal U1C_8 of AND gate U1C is connected to the first terminal of resistor R7. The second terminal of resistor R7 is connected to the control terminal Q2_1 of switch Q2. The first terminal Q2_2 of switch Q2 is connected to the target motor, i.e., the motor shown in the figure, and the second terminal Q2_3 of switch Q2 is grounded.

[0023] Based on this, the DC power supply BAT+ supplies power to the target motor. When the power supply is normal, the undervoltage protection module 11 will not output the first signal, the overcurrent detection module 12 will not output the second signal, the switching transistor Q3 remains in the off state, and the voltage of the first input terminal U1C_9 of the AND gate U1C is pulled high by the resistor R5. Due to the high voltage, the AND gate U1C outputs a PWM signal by ANDing with DC_PWM, so that the target motor works normally based on the PWM signal. If the voltage supplied by the DC power supply is too low, resulting in undervoltage, the undervoltage protection module will output a first signal to the control terminal Q3_1 of the switching transistor Q3. Alternatively, if the voltage of the DC power supply is unstable, resulting in excessive current, the overcurrent detection module will output a second signal to the control terminal Q3_1 of the switching transistor Q3. This will cause the switching transistor Q3 to conduct due to either the first or second signal, which will pull the voltage of the first input terminal U1C_9 of the AND gate U1C down to GND_BAT. Due to the low voltage, the AND gate U1C will AND with DC_PWM to output 0, i.e., a low level, controlling the switching transistor Q2 to remain in the off state, causing the target motor to stop working. This achieves shutdown protection for the target motor in the event of undervoltage or overcurrent.

[0024] In some embodiments, the motor drive module 13 further includes an isolation amplification unit, wherein the isolation amplification unit is connected to the output terminal of AND gate U1C and the first terminal of resistor R7, respectively; the isolation amplification unit is used to drive switch Q2 to work according to the PWM signal when switch Q3 does not receive the first signal and the second signal, so as to make the target motor work, and is used to control switch Q2 to remain in the off state when switch Q3 receives the first signal or the second signal, so as to make the target motor stop working. Specifically, the isolation amplification unit includes resistor R8, switch Q1, and switch Q4. Please refer to... Figure 2 , Figure 2 The diagram illustrates the circuit structure of an isolation amplifier unit. As shown in the figure, the first terminal Q1_3 of switch Q1 receives the supply voltage, i.e., +5V as shown in the figure. The second terminal Q1_2 of switch Q1 is connected to the first terminal Q4_2 of switch Q4. The control terminal Q1_1 of switch Q1 is connected to the output terminal U1C_8 of AND gate U1C through resistor R8. The first terminal Q4_2 of switch Q4 is connected to the first terminal of resistor R7. The second terminal Q4_3 of switch Q4 is grounded to GND_BAT. The control terminal Q2_1 of switch Q4 is connected to the control terminal Q1_1 of switch Q1. Based on this, when AND gate U1C outputs a low level, switch Q4 is turned on, so that the drive voltage of the control terminal of switch Q2 is 0, and the motor does not work; when AND gate U1C outputs a high level, switch Q1 is turned on, and the +5V supply voltage drives switch Q2 through resistor R7, and the motor works. This achieves the effect of driving the motor with a small voltage and provides isolation protection.

[0025] In some embodiments, the undervoltage protection module includes a comparator U2B, resistors R2, R3, and R4, and a diode D1. (Please refer to...) Figure 2 The first input terminal U2B_7 of comparator U2B receives the reference voltage. Figure 2 The voltage between resistors R1 and R11 is shown in the figure. The second input terminal U2B_6 of comparator U2B is connected to the DC power supply BAT+ through resistor R2, and grounded to GND_BAT through resistor R4. The output terminal U2B_1 of comparator U2B is connected to the anode D1_1 of diode D1 through resistor R3, and the cathode D1_2 of diode D1 is connected to the control terminal Q3_1 of switch Q3. Therefore, when the voltage of the DC power supply BAT+ is within the normal range, after voltage division by resistors R2 and R4, the voltage at the inverting terminal of comparator U2B is greater than the voltage at the non-inverting terminal. Comparator U2B outputs a low level to switch Q3, which remains off. AND gate U1C and switch Q2 control the target motor to operate normally based on the PWM signal. If the voltage of the DC power supply BAT+ drops to below the reference voltage after being divided by resistors R2 and R4, then the voltage at the inverting terminal of comparator U2B will be less than the voltage at the non-inverting terminal. Comparator U2B will output a high level to the switching transistor Q3, controlling the switching transistor Q3 to conduct. This will then pull down the voltage at the first input terminal U1C_9 of AND gate U1C, causing the output of AND gate U1C to be 0, i.e., low level. This will control the switching transistor Q2 to turn off and remain in the off state. The target motor will stop working because it will not be driven by the PWM signal, thus preventing the target motor from operating in an undervoltage state.

[0026] In some embodiments, the overcurrent detection module includes a comparator U2C, a resistor R9, a sampling resistor R10, and a diode D2. (Please refer to...) Figure 2 The first end of the sampling resistor R10 is connected to the target motor. Figure 2 The diagram illustrates a motor connected via a switching transistor Q2. The second terminal of sampling resistor R10 is grounded to GND_BAT, thus acquiring the target motor's operating current through resistor R10. Correspondingly, V1 represents the operating voltage corresponding to this current. The first input terminal U2C_8 of comparator U2C receives the reference voltage, which is the voltage between resistors R1 and R11 in the diagram. The second input terminal U2C_9 of comparator U2C is connected to the first terminal of sampling resistor R10. Figure 2For ease of viewing, the connection between the received voltage V1 and the sampling resistor R10 is illustrated. The output terminal U2C_14 of comparator U2C is connected to the anode D2_1 of diode D2 through resistor R9. The cathode D2_2 of diode D2 is connected to the control terminal Q3_1 of switch Q3. Based on this, when the DC power supply BAT+ normally supplies power to the motor, the operating voltage V1 corresponding to the operating current of the target motor is also relatively stable within the normal range. At this time, the voltage at the inverting terminal of comparator U2C is greater than the voltage at the non-inverting terminal. Comparator U2C outputs a low level to switch Q3, and switch Q3 remains in the off state. AND gate U1C and switch Q2 control the target motor to work normally based on the PWM signal. If the power supply is unstable, causing the target motor's operating current to be too high, and the operating voltage V1 corresponding to the operating current is greater than the reference voltage, then the voltage at the inverting terminal of comparator U2C will be less than the voltage at the non-inverting terminal. Comparator U2C will output a high level to the switching transistor Q3, controlling the switching transistor Q3 to conduct, which in turn pulls down the voltage at the first input terminal U1C_9 of AND gate U1C. The output of AND gate U1C will be 0, i.e., low level, controlling the switching transistor Q2 to turn off and remain in the off state, so that the target motor stops working due to the lack of PWM signal drive, thereby preventing the target motor from being damaged due to excessive operating current.

[0027] In some embodiments, the motor drive protection circuit further includes a reference voltage module, which is connected to the DC power supply, the undervoltage protection module, and the overcurrent detection module. This reference voltage module provides a constant reference voltage to the undervoltage protection module and the overcurrent detection module in conjunction with the DC power supply. Specifically, the reference voltage module includes resistors R12 and R13, a Zener diode DZ1, resistors R1 and R11. Please refer to... Figure 2 , Figure 2The diagram illustrates the circuit structure of a reference voltage module. As shown in the figure, the first end of resistor R12 is connected to the DC power supply BAT+, the second end of resistor R12 is connected to the first end of resistor R14 through resistor R13, and the second end of resistor R14 is grounded to GND_BAT. The cathode DZ1_2 of Zener diode DZ1 is connected to the first end of resistor R14, and the anode DZ1_1 of Zener diode DZ1 is connected to the second end of resistor R14. The first end of resistor R1 is connected to the first end of resistor R14, and the second end of resistor R1 is grounded to GND_BAT through resistor R11. The second end of resistor R1 is connected to the undervoltage protection module and the overcurrent detection module, specifically to the first input terminal U1B_7 of comparator U2B and the first input terminal U2C_8 of comparator U2C. Based on this, resistors R12, R13, R14 and Zener diode ZD1 divide the DC power supply BAT+. By setting the resistance values ​​of each resistor, a stable voltage, such as +5V, can be obtained at the first terminal of resistor R14. Then, the reference voltage is obtained through the voltage division of resistors R1 and R11, which serves as the non-inverting input of comparator U2B and the inverting input of comparator U2C. Thus, a stable reference voltage can be obtained directly from the DC power supply without the need for an additional power supply to provide the reference voltage.

[0028] In some embodiments, the first terminal of resistor R14 is connected to the first input terminal of AND gate U1C via resistor R5. This solution utilizes the stable voltage at the first terminal of resistor R14 in the reference voltage module, combined with resistor R5, to provide a stable pull-up voltage for AND gate U1C, while also avoiding the need for additional power supply and reducing circuit complexity.

[0029] The motor drive protection circuit provided in this application embodiment acquires the DC power supply voltage in real time through an undervoltage protection module and cuts off the motor drive by outputting a first signal when the DC power supply voltage is lower than the reference voltage; and samples the motor operating current through an overcurrent detection module and outputs a second signal to stop driving the target motor when the operating voltage corresponding to the operating current exceeds the reference voltage. This dual protection ensures that the target motor stops in time before inefficient operation caused by undervoltage or overheating damage caused by overcurrent. Moreover, the motor drive module is directly controlled through hardware signal interaction between modules, without relying on software judgment, resulting in a faster response speed. At the same time, the motor drive module drives the target motor normally according to the PWM signal when there is no abnormal signal, and triggers protection only when an abnormality is detected. This ensures that the normal operation of the target motor is not affected, and can respond quickly in case of power supply abnormality, thus protecting the safety of the target motor and the circuit in a timely manner.

[0030] This application provides an energy storage power supply, including the motor drive protection circuit as described above, which has the corresponding functional modules and beneficial effects of the circuit. For technical details not described in detail in the energy storage power supply embodiment, please refer to the motor drive protection circuit provided in the embodiment of this invention.

[0031] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A motor drive protection circuit, characterized by, Includes an undervoltage protection module, an overcurrent detection module, and a motor drive module; The undervoltage protection module is connected to the DC power supply and the motor drive module respectively, the overcurrent detection module is connected to the target motor and the motor drive module respectively, and the motor drive module is electrically connected to the target motor. The DC power supply is used to supply power to the target motor. The undervoltage protection module is used to output a first signal to the motor drive module when the voltage of the DC power supply is less than the reference voltage; The overcurrent detection module is used to sample the operating current of the target motor, and when the operating voltage corresponding to the operating current is greater than the reference voltage, it outputs a second signal to the motor drive module. The motor drive module is used to receive PWM signals and drive the target motor to work according to the PWM signals when neither the first signal nor the second signal is received; and to stop driving the target motor when the first signal or the second signal is received, so that the target motor stops working.

2. The motor drive protection circuit of claim 1, wherein, The motor drive module includes a switch Q3, a resistor R5, an AND gate U1C, a resistor R7, and a switch Q2; The first terminal of the switch Q3 is connected to the first input terminal of the AND gate U1C, the second terminal of the switch Q3 is grounded, the control terminal of the switch Q3 is connected to the undervoltage protection module and the overcurrent detection module, the first input terminal of the AND gate U1C receives the power supply voltage through the resistor R5, the second input terminal of the AND gate U1C is used to receive the PWM signal, the output terminal of the AND gate U1C is connected to the first terminal of the resistor R7, the second terminal of the resistor R7 is connected to the control terminal of the switch Q2, the first terminal of the switch Q2 is connected to the target motor, and the second terminal of the switch Q2 is grounded.

3. The motor drive protection circuit of claim 2, wherein, The motor drive module also includes an isolation amplifier unit, which is connected to the output terminal of the AND gate U1C and the first terminal of the resistor R7 respectively. The isolation amplification unit is used to drive the switch Q2 to work according to the PWM signal when the switch Q3 does not receive the first signal and the second signal, so as to make the target motor work; and is used to control the switch Q2 to remain in the off state when the switch Q3 receives the first signal or the second signal, so as to make the target motor stop working.

4. The motor drive protection circuit of claim 3, wherein, The isolation amplification unit includes a resistor R8, a switch Q1, and a switch Q4. The first terminal of the switch Q1 is used to receive the supply voltage. The second terminal of the switch Q1 is connected to the first terminal of the switch Q4. The control terminal of the switch Q1 is connected to the output terminal of the AND gate U1C through the resistor R8. The first terminal of the switch Q4 is connected to the first terminal of the resistor R7. The second terminal of the switch Q4 is grounded. The control terminal of the switch Q4 is connected to the control terminal of the switch Q1.

5. The motor drive protection circuit of claim 2, wherein, The undervoltage protection module includes a comparator U2B, resistors R2, R3, and R4, and a diode D1. The first input terminal of the comparator U2B is used to receive the reference voltage. The second input terminal of the comparator U2B is connected to a DC power supply through the resistor R2. The second input terminal of the comparator U2B is grounded through the resistor R4. The output terminal of the comparator U2B is connected to the anode of the diode D1 through the resistor R3. The cathode of the diode D1 is connected to the control terminal of the switching transistor Q3.

6. The motor drive protection circuit of claim 2, wherein, The overcurrent detection module includes a comparator U2C, a resistor R9, a sampling resistor R10, and a diode D2. The first end of the sampling resistor R10 is connected to the target motor, and the second end of the sampling resistor R10 is grounded. The first input terminal of the comparator U2C is used to receive the reference voltage, and the second input terminal of the comparator U2C is connected to the first end of the sampling resistor R10. The output terminal of the comparator U2C is connected to the anode of the diode D2 through the resistor R9, and the cathode of the diode D2 is connected to the control terminal of the switching transistor Q3.

7. The motor drive protection circuit of claim 2, wherein, The circuit also includes a reference voltage module, which is connected to the DC power supply, the undervoltage protection module, and the overcurrent detection module. The reference voltage module is used to provide a constant reference voltage to the undervoltage protection module and the overcurrent detection module in conjunction with the DC power supply.

8. The motor drive protection circuit of claim 7, wherein, The reference voltage module includes resistor R12, resistor R13, Zener diode DZ1, resistor R1, and resistor R11; The first end of resistor R12 is connected to the DC power supply. The second end of resistor R12 is connected to the first end of resistor R14 through resistor R13. The second end of resistor R14 is grounded. The cathode of Zener diode DZ1 is connected to the first end of resistor R14. The anode of Zener diode DZ1 is connected to the second end of resistor R14. The first end of resistor R1 is connected to the first end of resistor R14. The second end of resistor R1 is grounded through resistor R11. The second end of resistor R1 is connected to the undervoltage protection module and the overcurrent detection module.

9. The motor drive protection circuit of claim 8, wherein, The first terminal of resistor R14 is connected to the first input terminal of AND gate U1C through resistor R5.

10. An energy storage power supply, characterized by, Includes the motor drive protection circuit as described in any one of claims 1-9.

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