Drum drive circuit

Abstract

The utility model provides a roller driving circuit. The roller driving circuit comprises a controller, an inverter circuit, a signal sampling circuit, a current sampling circuit, a current protection circuit, a temperature sampling circuit and an indicating lamp circuit, the controller controls the operation of the three-phase motor through the inverter circuit; the signal sampling circuit is used for sampling each phase of driving signal of the inverter circuit and feeding back to the controller; the current sampling circuit is used for sampling a current signal of the inverter circuit and feeding back the current signal to the controller; the current protection circuit is used for monitoring a current signal of the inverter circuit and feeding back the current signal to the controller when the current signal exceeds a threshold value; according to the utility model, operation, stop or speed regulation of the three-phase motor can be controlled, forward and reverse rotation of the three-phase motor can also be controlled, and omnibearing control of operation of the balance wheel roller is realized; the driving current is monitored in real time, and an overload protection function is provided during overload.

Description

Technical Field

[0001] The utility model relates to a circuit, in particular to a roller driving circuit. Background Art

[0002] With the rapid development of the e-commerce and express delivery industries, logistics warehouses and distribution centers of major e-commerce and express delivery companies are placing increasingly high demands on the performance of intelligent conveying and sorting equipment. To meet the sorting needs of diverse scenarios, such as small soft package sorting and large heavy-load sorting, the pendulum wheel sorter was invented. The pendulum wheel drum is a crucial component and requires a drive circuit to operate.

[0003] The reliability and safety of existing roller drive circuits are relatively poor. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the embodiment of the present invention provides a drum drive circuit that improves safety and reliability. To achieve the above technical objectives, the technical solution adopted by the embodiment of the present invention is:

[0005] The embodiment of the utility model provides a drum driving circuit, including a controller, an inverter circuit, a signal sampling circuit, a current sampling circuit, a current protection circuit, a temperature sampling circuit, and an indicator light circuit;

[0006] The controller controls the operation of the three-phase motor through the inverter circuit;

[0007] The signal sampling circuit is used to sample the driving signals of each phase of the inverter circuit and feed them back to the controller;

[0008] The current sampling circuit is used to sample the current signal of the inverter circuit and feed it back to the controller;

[0009] The current protection circuit is used to monitor the current signal of the inverter circuit and provide feedback to the controller when the current signal exceeds a threshold;

[0010] The temperature sampling circuit is used to sample the temperature signal and feed it back to the controller;

[0011] The indicator light circuit is used to send out an indication signal when the motor is running.

[0012] More preferably, the controller is further connected to an upper level controller via an I2C interface.

[0013] Specifically, the inverter circuit includes NMOS tubes Q1, Q2, Q3, Q4, Q5 and Q6, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12, a sampling resistor Rx, and a capacitor C1;

[0014] One end of resistor R1 is connected to the U-phase upper arm drive signal M1-UP, and the other end is connected to one end of resistor R2 and the gate of NMOS transistor Q1; the drain of NMOS transistor Q1 is connected to positive voltage VM+; the other end of resistor R2 is connected to the source of NMOS transistor Q1 and the U-phase output node, which is used to output the U-phase drive signal M1-U that drives the three-phase motor;

[0015] One end of the resistor R7 is connected to the U-phase lower arm drive signal M1-UN, and the other end is connected to one end of the resistor R8 and the gate of the NMOS transistor Q4; the drain of the NMOS transistor Q4 is connected to the U-phase output node; the other end of the resistor R8 is connected to the source of the NMOS transistor Q4 and one end of the sampling resistor Rx;

[0016] One end of resistor R3 is connected to the V-phase upper arm drive signal M1-VP, and the other end is connected to one end of resistor R4 and the gate of NMOS transistor Q2; the drain of NMOS transistor Q2 is connected to positive voltage VM+; the other end of resistor R4 is connected to the source of NMOS transistor Q2 and the V-phase output node, which is used to output the V-phase drive signal M1-V for driving the three-phase motor;

[0017] One end of the resistor R9 is connected to the V-phase lower arm drive signal M1-VN, and the other end is connected to one end of the resistor R10 and the gate of the NMOS transistor Q5; the drain of the NMOS transistor Q5 is connected to the V-phase output node; the other end of the resistor R10 is connected to the source of the NMOS transistor Q5 and one end of the sampling resistor Rx;

[0018] One end of resistor R5 is connected to the W-phase upper arm drive signal M1-WP, and the other end is connected to one end of resistor R6 and the gate of NMOS transistor Q3; the drain of NMOS transistor Q3 is connected to positive voltage VM+; the other end of resistor R6 is connected to the source of NMOS transistor Q3 and the W-phase output node, which is used to output the W-phase drive signal M1-W for driving the three-phase motor;

[0019] One end of the resistor R11 is connected to the W-phase lower arm drive signal M1-WN, and the other end is connected to one end of the resistor R12 and the gate of the NMOS transistor Q6; the drain of the NMOS transistor Q6 is connected to the W-phase output node; the other end of the resistor R12 is connected to the source of the NMOS transistor Q6 and one end of the sampling resistor Rx;

[0020] One end of the capacitor C1 is connected to the positive voltage VM+, and the other end is connected to one end of the sampling resistor Rx; the other end of the sampling resistor Rx is grounded.

[0021] Specifically, the signal sampling circuit includes resistors R13, R14, R15, R16, R17, R18, and capacitors C2, C3, and C4;

[0022] One end of the resistor R13 is connected to the U-phase drive signal M1-U, and the other end is grounded through the resistor R16 and the capacitor C2, and feeds back the sampled U-phase drive signal M1-NULL_U to the controller;

[0023] One end of the resistor R14 is connected to the V-phase drive signal M1-V, and the other end is grounded through the resistor R17 and the capacitor C3, and feeds back the sampled V-phase drive signal M1-NULL_V to the controller;

[0024] One end of the resistor R15 is connected to the W-phase drive signal M1-W, and the other end is grounded via the resistor R18 and the capacitor C4, and feeds back the sampled W-phase drive signal M1-NULL_W to the controller.

[0025] Specifically, the current sampling circuit includes an operational amplifier U2, resistors R20, R21, R22, R23, R24, R25, and capacitors C5 and C6;

[0026] One end of the resistor R22 is connected to one end of the sampling resistor Rx and obtains the current signal M1-SHUNT of the inverter circuit. The other end of the resistor R22 is connected to the non-inverting input end of the operational amplifier U2, one end of the resistor R20 and one end of the resistor R21. The other end of the resistor R20 is connected to the positive voltage VCC5, and the other end of the resistor R21 is grounded; the inverting input end of the operational amplifier U2 is connected to one end of the resistor R23, one end of the resistor R24 ​​and one end of the capacitor C5. The other end of the resistor R24 ​​is grounded, and the other end of the resistor R23 and the other end of the capacitor C5 are connected to the output end of the operational amplifier U2; the output end of the operational amplifier U2 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to one end of the capacitor C6, and the sampled current signal M1-I-OUT of the inverter circuit is fed back to the controller. The other end of the capacitor C6 is grounded.

[0027] Specifically, the current protection circuit includes a comparator U3, resistors R30, R31, R32, R33, R34, capacitors C7, C8, C9;

[0028] One end of resistor R30 is connected to the positive voltage VCC5, and the other end is connected to the non-inverting input of the comparator U3, one end of the resistor R31 and one end of the capacitor C7, and the other end of the resistor R31 and the other end of the capacitor C7 are grounded; one end of resistor R33 is connected to the current signal M1-SHUNT of the inverter circuit, and the other end is connected to the inverting input of the comparator U3, one end of the resistor R32 and one end of the capacitor C8, the other end of the resistor R32 is connected to the positive voltage VCC5, and the other end of the capacitor C8 is grounded; the output end of the comparator U3 is connected to one end of the resistor R34 and one end of the capacitor C9, and sends a comparison feedback signal M1-OC-MCU to the controller; the other end of the resistor R34 is connected to the positive voltage VCC5, and the other end of the capacitor C9 is grounded.

[0029] Specifically, the temperature sampling circuit includes a thermistor NTC1, a resistor R40 and a capacitor C11;

[0030] One end of the resistor R40 is connected to the positive voltage VCC5, and the other end is connected to one end of the thermistor RTC1 and one end of the capacitor C11, and feeds back the temperature signal M1-NTC to the controller. The other end of the thermistor RTC1 is grounded, and the other end of the capacitor C11 is grounded.

[0031] Specifically, the indicator light circuit includes a light emitting diode LED1 and a resistor R41;

[0032] The anode of the light emitting diode LED1 is connected to the positive voltage VCC1 , the cathode is connected to one end of the resistor R41 , and the other end of the resistor R41 is connected to the light emitting control signal M1 -LED; the light emitting control signal M1 -LED comes from the controller.

[0033] The beneficial effects of the technical solution provided by the embodiment of the present invention are as follows: the present invention can control the operation, stop or speed regulation of the three-phase motor, and can also control the forward and reverse rotation of the three-phase motor, thereby realizing all-round control of the operation of the balance wheel drum; it monitors the driving current in real time and provides an overload protection function when overloaded, thereby improving safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an electrical block diagram of the drum drive circuit in an embodiment of the present utility model.

[0035] Figure 2 This is an electrical schematic diagram of the inverter circuit in an embodiment of the present utility model.

[0036] Figure 3 This is a schematic diagram of a signal sampling circuit in an embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of a current sampling circuit in an embodiment of the present utility model.

[0038] Figure 5 This is a schematic diagram of the current protection circuit in an embodiment of the present utility model.

[0039] Figure 6 This is a schematic diagram of the temperature sampling circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] like Figure 1As shown, a drum driving circuit proposed in an embodiment of the present utility model includes a controller, an inverter circuit, a signal sampling circuit, a current sampling circuit, a current protection circuit, a temperature sampling circuit, and an indicator light circuit;

[0042] The controller controls the operation of the three-phase motor through the inverter circuit;

[0043] The signal sampling circuit is used to sample the driving signals of each phase of the inverter circuit and feed them back to the controller;

[0044] The current sampling circuit is used to sample the current signal of the inverter circuit and feed it back to the controller;

[0045] The current protection circuit is used to monitor the current signal of the inverter circuit and provide feedback to the controller when the current signal exceeds a threshold;

[0046] The temperature sampling circuit is used to sample the temperature signal and feed it back to the controller;

[0047] The indicator light circuit is used to send out an indication signal when the motor is running.

[0048] In this embodiment, the controller controls the operation of the three-phase motor through the inverter circuit, which can control the three-phase motor to start, stop or adjust the speed, and can also control the forward and reverse rotation of the three-phase motor, thereby realizing all-round control of the operation of the balance wheel drum; the driving signal can be sampled and fed back in real time through the signal sampling circuit, and the driving current can be sampled and fed back in real time through the current sampling circuit, so that the controller can know the current control status of the three-phase motor in real time; current overload protection can be achieved through the current protection circuit, and over-temperature protection can be achieved through the temperature sampling circuit.

[0049] More preferably, the controller can also be connected to the upper-level controller through the I2C interface, so that the upper-level controller can be connected to multiple roller drive circuits to drive multiple roller motors.

[0050] like Figure 2 As shown, the inverter circuit includes NMOS tubes Q1, Q2, Q3, Q4, Q5 and Q6, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12, a sampling resistor Rx, and a capacitor C1;

[0051] One end of resistor R1 is connected to the U-phase upper arm drive signal M1-UP, and the other end is connected to one end of resistor R2 and the gate of NMOS transistor Q1; the drain of NMOS transistor Q1 is connected to positive voltage VM+; the other end of resistor R2 is connected to the source of NMOS transistor Q1 and the U-phase output node, which is used to output the U-phase drive signal M1-U that drives the three-phase motor;

[0052] One end of the resistor R7 is connected to the U-phase lower arm drive signal M1-UN, and the other end is connected to one end of the resistor R8 and the gate of the NMOS transistor Q4; the drain of the NMOS transistor Q4 is connected to the U-phase output node; the other end of the resistor R8 is connected to the source of the NMOS transistor Q4 and one end of the sampling resistor Rx;

[0053] One end of resistor R3 is connected to the V-phase upper arm drive signal M1-VP, and the other end is connected to one end of resistor R4 and the gate of NMOS transistor Q2; the drain of NMOS transistor Q2 is connected to positive voltage VM+; the other end of resistor R4 is connected to the source of NMOS transistor Q2 and the V-phase output node, which is used to output the V-phase drive signal M1-V for driving the three-phase motor;

[0054] One end of the resistor R9 is connected to the V-phase lower arm drive signal M1-VN, and the other end is connected to one end of the resistor R10 and the gate of the NMOS transistor Q5; the drain of the NMOS transistor Q5 is connected to the V-phase output node; the other end of the resistor R10 is connected to the source of the NMOS transistor Q5 and one end of the sampling resistor Rx;

[0055] One end of resistor R5 is connected to the W-phase upper arm drive signal M1-WP, and the other end is connected to one end of resistor R6 and the gate of NMOS transistor Q3; the drain of NMOS transistor Q3 is connected to positive voltage VM+; the other end of resistor R6 is connected to the source of NMOS transistor Q3 and the W-phase output node, which is used to output the W-phase drive signal M1-W for driving the three-phase motor;

[0056] One end of the resistor R11 is connected to the W-phase lower arm drive signal M1-WN, and the other end is connected to one end of the resistor R12 and the gate of the NMOS transistor Q6; the drain of the NMOS transistor Q6 is connected to the W-phase output node; the other end of the resistor R12 is connected to the source of the NMOS transistor Q6 and one end of the sampling resistor Rx;

[0057] One end of the capacitor C1 is connected to the positive voltage VM+, and the other end is connected to one end of the sampling resistor Rx; the other end of the sampling resistor Rx is grounded;

[0058] The U-phase upper arm drive signal M1-UP, the U-phase lower arm drive signal M1-UN, the V-phase upper arm drive signal M1-VP, the V-phase lower arm drive signal M1-VN, the W-phase upper arm drive signal M1-WP and the W-phase lower arm drive signal M1-WN all come from the controller, which specifically uses a single-chip microcomputer; the positive voltage VM+ uses +48v; the operation mode of the three-phase motor is as follows: when the three-phase motor rotates forward, the U-phase upper arm drive signal M1-UP and the V-phase lower arm drive signal M1-VN are first given a high level, the NMOS tubes Q1 and Q5 are turned on, and the other NMOS tubes are turned off, the current completes the circuit from the U-phase to the V-phase, and the drum motor rotates forward. Run 120°; then give the V-phase upper arm drive signal M1-VP and the W-phase lower arm drive signal M1-WN high levels, NMOS tubes Q2 and Q6 turn on, and other NMOS tubes turn off, the current completes the circuit from V-phase to W-phase, and the drum motor runs 120° in the forward direction; then give the W-phase upper arm drive signal M1-WP and the U-phase lower arm drive signal M1-UN high levels, NMOS tubes Q3 and Q4 turn on, and other NMOS tubes turn off, the current completes the circuit from W-phase to U-phase, and the drum motor runs 120° in the forward direction; at this point, the drum motor rotates one circle in the forward direction, and the same applies to the reverse direction; the motor rotation speed can be controlled by pulse width modulation PWM.

[0059] like Figure 3 As shown, the signal sampling circuit includes resistors R13, R14, R15, R16, R17, R18, and capacitors C2, C3, and C4;

[0060] One end of the resistor R13 is connected to the U-phase drive signal M1-U, and the other end is grounded through the resistor R16 and the capacitor C2, and feeds back the sampled U-phase drive signal M1-NULL_U to the controller;

[0061] One end of the resistor R14 is connected to the V-phase drive signal M1-V, and the other end is grounded through the resistor R17 and the capacitor C3, and feeds back the sampled V-phase drive signal M1-NULL_V to the controller;

[0062] One end of the resistor R15 is connected to the W-phase drive signal M1-W, and the other end is grounded via the resistor R18 and the capacitor C4, and feeds back the sampled W-phase drive signal M1-NULL_W to the controller.

[0063] like Figure 4 As shown, the current sampling circuit includes an operational amplifier U2, resistors R20, R21, R22, R23, R24, R25, and capacitors C5 and C6;

[0064] One end of the resistor R22 is connected to one end of the sampling resistor Rx and obtains the current signal M1-SHUNT of the inverter circuit. The other end of the resistor R22 is connected to the non-inverting input end of the operational amplifier U2, one end of the resistor R20, and one end of the resistor R21. The other end of the resistor R20 is connected to the positive voltage VCC5, and the other end of the resistor R21 is grounded. The inverting input end of the operational amplifier U2 is connected to one end of the resistor R23, one end of the resistor R24, and one end of the capacitor C5. The other end of the resistor R24 ​​is grounded. The other end of the resistor R23 and the other end of the capacitor C5 are connected to the output end of the operational amplifier U2. The output end of the operational amplifier U2 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to one end of the capacitor C6, and the sampled current signal M1-I-OUT of the inverter circuit is fed back to the controller. The other end of the capacitor C6 is grounded.

[0065] Among them, the positive voltage VCC5 is +5v.

[0066] like Figure 5 As shown, the current protection circuit includes a comparator U3, resistors R30, R31, R32, R33, R34, and capacitors C7, C8, and C9;

[0067] One end of resistor R30 is connected to a positive voltage VCC5, and the other end is connected to a non-inverting input of comparator U3, one end of resistor R31, and one end of capacitor C7. The other end of resistor R31 and the other end of capacitor C7 are grounded. One end of resistor R33 is connected to a current signal M1-SHUNT of the inverter circuit, and the other end is connected to an inverting input of comparator U3, one end of resistor R32, and one end of capacitor C8. The other end of resistor R32 is connected to a positive voltage VCC5, and the other end of capacitor C8 is grounded. The output end of comparator U3 is connected to one end of resistor R34 and one end of capacitor C9, and sends a comparison feedback signal M1-OC-MCU to the controller. The other end of resistor R34 is connected to a positive voltage VCC5, and the other end of capacitor C9 is grounded.

[0068] The comparator U3 will flip when the current signal M1-SHUNT is too large; the controller can then perform current overload protection in a timely manner.

[0069] like Figure 6 As shown, the temperature sampling circuit includes a thermistor NTC1, a resistor R40 and a capacitor C11;

[0070] One end of the resistor R40 is connected to the positive voltage VCC5, and the other end is connected to one end of the thermistor RTC1 and one end of the capacitor C11, and feeds back the temperature signal M1-NTC to the controller. The other end of the thermistor RTC1 is grounded, and the other end of the capacitor C11 is grounded.

[0071] The indicator light circuit includes a light emitting diode LED1 and a resistor R41;

[0072] The anode of the light emitting diode LED1 is connected to the positive voltage VCC1 , the cathode is connected to one end of the resistor R41 , and the other end of the resistor R41 is connected to the light emitting control signal M1 -LED; the light emitting control signal M1 -LED comes from the controller.

[0073] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A drum driving circuit, characterized in that: Including controller, inverter circuit, signal sampling circuit, current sampling circuit, current protection circuit, temperature sampling circuit, indicator light circuit; The controller controls the operation of the three-phase motor through the inverter circuit; The signal sampling circuit is used to sample the driving signals of each phase of the inverter circuit and feed them back to the controller; The current sampling circuit is used to sample the current signal of the inverter circuit and feed it back to the controller; The current protection circuit is used to monitor the current signal of the inverter circuit and provide feedback to the controller when the current signal exceeds a threshold; The temperature sampling circuit is used to sample the temperature signal and feed it back to the controller; The indicator light circuit is used to send out an indication signal when the motor is running.

2. The drum driving circuit according to claim 1, wherein: The controller is also connected to the upper level controller via an I2C interface.

3. The drum driving circuit according to claim 1, wherein: The inverter circuit includes NMOS tubes Q1, Q2, Q3, Q4, Q5 and Q6, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12, a sampling resistor Rx, and a capacitor C1; One end of resistor R1 is connected to the U-phase upper arm drive signal M1-UP, and the other end is connected to one end of resistor R2 and the gate of NMOS transistor Q1; the drain of NMOS transistor Q1 is connected to positive voltage VM+; the other end of resistor R2 is connected to the source of NMOS transistor Q1 and the U-phase output node, which is used to output the U-phase drive signal M1-U that drives the three-phase motor; One end of the resistor R7 is connected to the U-phase lower arm drive signal M1-UN, and the other end is connected to one end of the resistor R8 and the gate of the NMOS transistor Q4; the drain of the NMOS transistor Q4 is connected to the U-phase output node; the other end of the resistor R8 is connected to the source of the NMOS transistor Q4 and one end of the sampling resistor Rx; One end of resistor R3 is connected to the V-phase upper arm drive signal M1-VP, and the other end is connected to one end of resistor R4 and the gate of NMOS transistor Q2; the drain of NMOS transistor Q2 is connected to positive voltage VM+; the other end of resistor R4 is connected to the source of NMOS transistor Q2 and the V-phase output node, which is used to output the V-phase drive signal M1-V for driving the three-phase motor; One end of the resistor R9 is connected to the V-phase lower arm drive signal M1-VN, and the other end is connected to one end of the resistor R10 and the gate of the NMOS transistor Q5; the drain of the NMOS transistor Q5 is connected to the V-phase output node; the other end of the resistor R10 is connected to the source of the NMOS transistor Q5 and one end of the sampling resistor Rx; One end of resistor R5 is connected to the W-phase upper arm drive signal M1-WP, and the other end is connected to one end of resistor R6 and the gate of NMOS transistor Q3; the drain of NMOS transistor Q3 is connected to positive voltage VM+; the other end of resistor R6 is connected to the source of NMOS transistor Q3 and the W-phase output node, which is used to output the W-phase drive signal M1-W for driving the three-phase motor; One end of the resistor R11 is connected to the W-phase lower arm drive signal M1-WN, and the other end is connected to one end of the resistor R12 and the gate of the NMOS transistor Q6; the drain of the NMOS transistor Q6 is connected to the W-phase output node; the other end of the resistor R12 is connected to the source of the NMOS transistor Q6 and one end of the sampling resistor Rx; One end of the capacitor C1 is connected to the positive voltage VM+, and the other end is connected to one end of the sampling resistor Rx; the other end of the sampling resistor Rx is grounded.

4. The drum driving circuit according to claim 3, wherein: The signal sampling circuit includes resistors R13, R14, R15, R16, R17, R18, and capacitors C2, C3, and C4; One end of the resistor R13 is connected to the U-phase drive signal M1-U, and the other end is grounded through the resistor R16 and the capacitor C2, and feeds back the sampled U-phase drive signal M1-NULL_U to the controller; One end of the resistor R14 is connected to the V-phase drive signal M1-V, and the other end is grounded through the resistor R17 and the capacitor C3, and feeds back the sampled V-phase drive signal M1-NULL_V to the controller; One end of the resistor R15 is connected to the W-phase drive signal M1-W, and the other end is grounded via the resistor R18 and the capacitor C4, and feeds back the sampled W-phase drive signal M1-NULL_W to the controller.

5. The drum driving circuit according to claim 3, wherein: The current sampling circuit includes an operational amplifier U2, resistors R20, R21, R22, R23, R24, R25, and capacitors C5 and C6; One end of the resistor R22 is connected to one end of the sampling resistor Rx and obtains the current signal M1-SHUNT of the inverter circuit. The other end of the resistor R22 is connected to the non-inverting input end of the operational amplifier U2, one end of the resistor R20 and one end of the resistor R21. The other end of the resistor R20 is connected to the positive voltage VCC5, and the other end of the resistor R21 is grounded; the inverting input end of the operational amplifier U2 is connected to one end of the resistor R23, one end of the resistor R24 ​​and one end of the capacitor C5. The other end of the resistor R24 ​​is grounded, and the other end of the resistor R23 and the other end of the capacitor C5 are connected to the output end of the operational amplifier U2; the output end of the operational amplifier U2 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to one end of the capacitor C6, and the sampled current signal M1-I-OUT of the inverter circuit is fed back to the controller. The other end of the capacitor C6 is grounded.

6. The drum driving circuit according to claim 3, wherein: The current protection circuit includes a comparator U3, resistors R30, R31, R32, R33, R34, capacitors C7, C8, C9; One end of resistor R30 is connected to the positive voltage VCC5, and the other end is connected to the non-inverting input of the comparator U3, one end of the resistor R31 and one end of the capacitor C7, and the other end of the resistor R31 and the other end of the capacitor C7 are grounded; one end of resistor R33 is connected to the current signal M1-SHUNT of the inverter circuit, and the other end is connected to the inverting input of the comparator U3, one end of the resistor R32 and one end of the capacitor C8, the other end of the resistor R32 is connected to the positive voltage VCC5, and the other end of the capacitor C8 is grounded; the output end of the comparator U3 is connected to one end of the resistor R34 and one end of the capacitor C9, and sends a comparison feedback signal M1-OC-MCU to the controller; the other end of the resistor R34 is connected to the positive voltage VCC5, and the other end of the capacitor C9 is grounded.

7. The drum driving circuit according to claim 1, 2 or 3, characterized in that: The temperature sampling circuit includes a thermistor NTC1, a resistor R40 and a capacitor C11; One end of the resistor R40 is connected to the positive voltage VCC5, and the other end is connected to one end of the thermistor RTC1 and one end of the capacitor C11, and feeds back the temperature signal M1-NTC to the controller. The other end of the thermistor RTC1 is grounded, and the other end of the capacitor C11 is grounded.

8. The drum driving circuit according to claim 1, 2 or 3, characterized in that: The indicator light circuit includes a light emitting diode LED1 and a resistor R41; The anode of the light emitting diode LED1 is connected to the positive voltage VCC1 , the cathode is connected to one end of the resistor R41 , and the other end of the resistor R41 is connected to the light emitting control signal M1 -LED; the light emitting control signal M1 -LED comes from the controller.

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