Motor driving circuit

Abstract

The utility model provides a motor driving circuit, which comprises a driving power supply, a driving chip, an isolation circuit module and a discharge protection circuit module, and is characterized in that a first end of the isolation circuit module is connected with a first voltage and the driving chip, a second end of the isolation circuit module is connected with the driving power supply, and the first voltage is generated based on a reverse electromotive force generated by rotation of a motor; a first end of the bleeder protection circuit module is connected with the driving chip, a second end of the bleeder protection circuit module is connected with the motor, a third end of the bleeder protection circuit module is connected with a first voltage, and a fourth end of the bleeder protection circuit module is connected with a ground wire; through the isolation circuit module, reverse electromotive force generated by rotation of the motor is prevented from flowing backwards to the driving power supply, and a voltage step is formed to eliminate the influence on other circuits. And peak voltage generated by rotation of the motor is discharged through the discharge protection circuit module, so that protection of a motor winding is realized.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a motor drive circuit. Background Art

[0002] Motor drive applications are becoming more and more widespread. In practical applications, since the motor winding is a coil, a reverse electromotive force will be generated during the commutation process. On the one hand, the generated reverse electromotive force will exceed the voltage that the winding coil can withstand, and on the other hand, it will flow back to the drive power supply to cause a voltage step, causing other drive circuits to work unstable. Utility Model Content

[0003] The main purpose of the embodiments of the present application is to propose a motor drive circuit, which aims to prevent the reverse electromotive force generated by the rotation of the motor from flowing back to the drive power supply through an isolation circuit module, thereby forming a voltage step to eliminate the impact on other drive circuits; and to discharge the peak voltage generated by the rotation of the motor through a discharge protection circuit module to achieve protection of the motor winding.

[0004] To achieve the above-mentioned purpose, the embodiment of the present application proposes a motor drive circuit, including a drive power supply, a drive chip, an isolation circuit module and a discharge protection circuit module, wherein:

[0005] The first end of the isolation circuit module is connected to a first voltage and the driving chip, and the second end of the isolation circuit module is connected to a driving power supply, wherein the first voltage is generated based on a reverse electromotive force generated by the rotation of the motor;

[0006] The isolation circuit module is used to isolate the first voltage from the driving power supply so that the first voltage does not flow back to the driving power supply;

[0007] A first end of the discharge protection circuit module is connected to the driving chip, a second end of the discharge protection circuit module is connected to the motor, a third end of the discharge protection circuit module is connected to the first voltage, and a fourth end of the discharge protection circuit module is connected to a ground line;

[0008] The discharge protection circuit module is used to discharge the forward peak voltage generated by the rotation of the motor to the first voltage, and to discharge the reverse peak voltage generated by the rotation of the motor to the ground line.

[0009] In some embodiments, the isolation circuit module includes a first diode and a first magnetic bead;

[0010] A first end of the first diode is connected to the first voltage and the driving chip, a second end of the first diode is connected to a first end of the first magnetic bead, and a second end of the first magnetic bead is connected to the driving power supply.

[0011] In some embodiments, the discharge protection circuit module includes a first diode group and a second diode group, and the first diode group and the second diode group each include a plurality of diodes connected in parallel;

[0012] A first end of the first diode group is connected to the motor, and a second end of the first diode group is connected to the first voltage;

[0013] A first end of the second diode group is connected to the motor, and a second end of the second diode group is connected to the ground line.

[0014] In some embodiments, the motor drive circuit further includes a voltage absorption circuit module, the voltage absorption circuit module includes a transient suppression diode group, and the transient suppression diode group includes a plurality of transient suppression diodes connected in parallel;

[0015] A first end of the transient suppression diode group is connected between the discharge protection circuit module and the driving chip, and a second end of the transient suppression diode group is grounded.

[0016] In some embodiments, the motor drive circuit further includes a first filter circuit module, the first filter circuit module includes a first capacitor group, and the first capacitor group includes a plurality of capacitors connected in parallel;

[0017] A first end of the first capacitor group is connected between the voltage absorption circuit module and the driving chip, and a second end of the first capacitor group is grounded.

[0018] In some embodiments, the motor drive circuit also includes a second filter circuit module, the second filter circuit module includes a first magnetic bead group, the first magnetic bead group includes a plurality of second magnetic beads, and each of the second magnetic beads is connected between the drive chip and the first filter circuit module.

[0019] In some embodiments, the motor driving circuit further includes a sampling circuit module, and the sampling circuit module is connected to the driving chip;

[0020] The sampling circuit module includes a first resistor and a second resistor;

[0021] A first end of the first resistor is connected to the driving chip, and a second end of the first resistor is grounded;

[0022] A first end of the second resistor is connected to the driving chip, and a second end of the second resistor is grounded.

[0023] In some embodiments, the motor driving circuit further includes a voltage driving circuit module, and the voltage driving circuit module is connected to the driving chip;

[0024] The voltage driving circuit module includes a first capacitor and a second capacitor;

[0025] The first end of the first capacitor and the second end of the first capacitor are both connected to the driving chip;

[0026] The first end of the second capacitor and the second end of the second capacitor are both connected to the driving chip.

[0027] In some embodiments, the motor driving circuit further includes a decoupling circuit module, a first end of the decoupling circuit module is connected to the driving chip, and a second end of the decoupling circuit module is connected to a first end of the isolation circuit module.

[0028] In some embodiments, the decoupling circuit module includes a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor;

[0029] The first end of the third capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the third capacitor is grounded;

[0030] The first end of the fourth capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the fourth capacitor is connected to the second end of the third capacitor and then grounded together;

[0031] The first end of the fifth capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the fifth capacitor is connected to the second end of the fourth capacitor and then grounded together;

[0032] The first end of the sixth capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the sixth capacitor is connected to the second end of the fifth capacitor and grounded together.

[0033] The present application proposes a motor drive circuit, including a driving power supply, a driving chip, an isolation circuit module and a discharge protection circuit module, wherein the first end of the isolation circuit module is connected to a first voltage and a driving chip, the second end of the isolation circuit module is connected to the driving power supply, and the first voltage is generated based on the reverse electromotive force generated by the rotation of the motor; the isolation circuit module is used to isolate the first voltage and the driving power supply so that the first voltage does not flow back to the driving power supply; the first end of the discharge protection circuit module is connected to the driving chip, the second end of the discharge protection circuit module is connected to the motor, the third end of the discharge protection circuit module is connected to the first voltage, and the fourth end of the discharge protection circuit module is connected to the ground wire; the discharge protection circuit module is used to discharge the forward peak voltage generated by the rotation of the motor to the first voltage, and discharge the reverse peak voltage generated by the rotation of the motor to the ground wire. The isolation circuit module prevents the reverse electromotive force generated by the rotation of the motor from flowing back to the driving power supply, forming a voltage step to eliminate the influence on other driving circuits; the peak voltage generated by the rotation of the motor is discharged by the discharge protection circuit module to achieve protection of the motor winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the structure of a motor drive circuit provided in an embodiment of the present application;

[0035] Figure 2 is a circuit diagram of an isolation circuit module provided in an embodiment of the present application;

[0036] Figure 3 is a circuit diagram of a discharge protection circuit module provided in an embodiment of the present application;

[0037] Figure 4 is a specific circuit diagram of the motor drive circuit provided in the embodiment of the present application;

[0038] Figure 5 It is a schematic diagram of the motor winding drive voltage waveform provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] Driving power supply-200; isolation circuit module-210; driving chip-220; discharge protection circuit-230; pressure absorption circuit module-240; first filter circuit module-250; second filter circuit module-260; sampling circuit module-270; voltage driving circuit module-280; decoupling circuit module-290. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0044] In the automation control industry or the machine vision industry, motors are needed. The windings of the motors are coils, which will generate reverse electromotive force during the commutation process. On the one hand, the generated reverse electromotive force will exceed the voltage that the winding coil can withstand, and on the other hand, it will flow back to the drive power supply to cause a voltage step, causing other drive circuits to work unstable.

[0045] Usually, there are two ways to eliminate the reverse electromotive force in the motor drive circuit. One is to use an RC circuit or capacitor to absorb the reverse electromotive force generated by the motor rotation. In this solution, since the peak frequency of the reverse electromotive force varies, the capacitor is only effective for a single frequency, and the frequency change cannot guarantee a good absorption effect. The other is to absorb the reverse electromotive force generated by the motor rotation through a TVS (transient suppression diode); in this solution, the peak pulse generated by the motor rotation may not be enough for the TVS to work, so the TVS cannot absorb the reverse electromotive force.

[0046] Based on this, the present application proposes a motor drive circuit, which uses an isolation circuit module to prevent the reverse electromotive force generated by the rotation of the motor from flowing back to the drive power supply, forming a voltage step to eliminate the impact on other drive circuits; and uses a discharge protection circuit module to discharge the peak voltage generated by the rotation of the motor to protect the motor winding.

[0047] Reference Figure 1 , Figure 1 : is a schematic diagram of the structure of the motor drive circuit provided in the embodiment of the present application. The motor drive circuit includes a drive power supply 200, a drive chip 210, an isolation circuit module 220 and a discharge protection circuit module 230, wherein:

[0048] A first end of the isolation circuit module 220 is connected to a first voltage and the driving chip 210 , and a second end of the isolation circuit module 220 is connected to the driving power supply 200 . The first voltage is generated based on a reverse electromotive force generated by the rotation of the motor.

[0049] The isolation circuit module 220 is used to isolate the first voltage from the driving power source 200 , so that the first voltage 240 does not flow back to the driving power source 200 .

[0050] A first end of the discharge protection circuit module 230 is connected to the driving chip 210 , a second end of the discharge protection circuit module 230 is connected to the motor, a third end of the discharge protection circuit module 230 is connected to the first voltage, and a fourth end of the discharge protection circuit module 230 is connected to the ground line.

[0051] The discharge protection circuit module 230 is used to discharge the forward peak voltage generated by the rotation of the motor to the first voltage, and to discharge the reverse peak voltage generated by the rotation of the motor to the ground.

[0052] In the embodiment of the present application, by setting up the isolation circuit module 220, the reverse electromotive force generated by the rotation of the motor can be prevented from flowing back to the driving power supply to form a voltage step to eliminate the influence on other driving circuits. At the same time, the influence of the induced electromotive force generated by the manual push-pull motor on the electronic circuit under static conditions can be eliminated. By setting up the discharge protection circuit module 230, the peak voltage generated by the rotation of the motor can be discharged to achieve protection of the motor winding.

[0053] Reference Figure 2 , Figure 2 is a circuit diagram of an isolation circuit module provided in an embodiment of the present application. Figure 2 As shown, the isolation circuit module includes a first diode D73 and a first magnetic bead FB97. The first end of the first diode D73 is connected to the first voltage VCC24V_U and the driver chip, the second end of the first diode D73 is connected to the first end of the first magnetic bead FB97, and the second end of the first magnetic bead FB97 is connected to the driving power supply VCC24V.

[0054] In the embodiment of the present application, the first diode D73 is disposed between the first voltage VCC24V_U and the driving power supply VCC24V, thereby preventing the first voltage VCC24V_U from flowing back to the driving power supply VCC24V, thereby ensuring circuit stability. The first magnetic bead FB97 can be used to absorb noise of the driving power supply.

[0055] In the embodiment of the present application, when the device is not working, the motor is in a free state without a locked shaft. If the motor is manually pushed and pulled, there is a permanent magnet in the rotor inside the motor, which generates a magnetic field around it. The manual push-pull motor cuts the magnetic flux lines to generate an induced voltage on the winding, and a voltage is generated between the motor's driver chip and the driver power supply, that is, there will be a voltage at VCC24V_U, which is isolated by the first diode D73. The voltage at the driver power supply VCC24V is still 0. When the device is not working, since the voltage at the driver power supply VCC24V is 0, other unit circuits will not work, and the motor's driver chip will not work because there is no external signal drive. This can eliminate the influence of the induced electromotive force generated by the motor being manually pushed and pulled on the electronic circuit in a static state.

[0056] Reference Figure 3 , Figure 3 is a circuit diagram of a discharge protection circuit module provided in an embodiment of the present application, comprising Figure 3 As shown, the discharge protection circuit module includes a first diode group and a second diode group, and the first diode group and the second diode group each include a plurality of diodes connected in parallel. The first end of the first diode group is connected to the motor, and the second end of the first diode group is connected to the first voltage VCC24V_U. The first end of the second diode group is connected to the motor, and the second end of the second diode group is connected to the ground line DGND.

[0057] In an embodiment of the present application, the number of diodes included in the first diode group and the second diode group is related to the connected motor. For example, if a single-phase stepper motor is connected, the first diode group and the second diode group each correspond to 2 parallel diodes. If a two-phase stepper motor is connected, the first diode group and the second diode group each correspond to 4 parallel diodes. If a three-phase stepper motor is connected, the first diode group and the second diode group each correspond to 6 parallel diodes. It should be noted that if the connected motors are different, the corresponding driver chips are also different.

[0058] For example, Figure 3 As shown, the connected motor is a two-phase 4-wire stepper motor. At this time, the motor is connected to the discharge protection circuit module through the 4-pin connector J23. Among them, pin 1 and pin 2 are A phases, and pin 3 and pin 4 are B phases. The positive peak voltage of phase A generated by the rotation of the motor is discharged to the first voltage VCC24V_U through diode D230 and diode D229, and the reverse peak pulse of phase A generated by the rotation of the motor is discharged to the ground line DGND through diode D225 and diode D226. The positive peak voltage of phase B generated by the rotation of the motor is discharged to the first voltage VCC24V_U through diode D231 and diode D232, and the reverse peak voltage of phase B generated by the rotation of the motor is discharged to the ground line DGND through diode D227 and diode D228. Here, the first diode group and the second diode group each correspond to 4 diodes connected in parallel. The first diode group includes a total of 4 diodes in parallel, including diode D230, diode D229, diode D231 and diode D232. The second diode group includes a diode D225, a diode D226, a diode D227 and a diode D228, which are four diodes connected in parallel.

[0059] Reference Figure 4 , Figure 4 is a specific circuit diagram of the motor drive circuit provided in the embodiment of the present application, such as Figure 4 As shown, the motor drive circuit includes not only a drive power supply 200, a drive chip 210, an isolation circuit module 220 and a discharge protection circuit module 230, but also a pressure absorption circuit module 240, a first filter circuit module 250, a second filter circuit module 260, a sampling circuit module 270, a voltage drive circuit module 280 and a decoupling circuit module 290.

[0060] Among them, refer to Figure 4 The voltage absorption circuit module 240 includes a transient suppression diode group, which includes a plurality of transient suppression diodes connected in parallel. The first end of the transient suppression diode group is connected between the discharge protection circuit module 230 and the driving chip 210, and the second end of the transient suppression diode group is grounded DGND.

[0061] Similarly, in the embodiment of the present application, the number of transient suppression diodes included in the transient suppression diode group is related to the connected motor. For example, if a single-phase stepper motor is connected, the transient suppression diode group correspondingly includes 2 transient suppression diodes connected in parallel. If a two-phase stepper motor is connected, the transient suppression diode group correspondingly includes 4 transient suppression diodes connected in parallel. If a three-phase stepper motor is connected, the transient suppression diode group correspondingly includes 6 transient suppression diodes connected in parallel.

[0062] For example, Figure 4 As shown, the connected motor is a two-phase four-wire stepper motor. At this time, the transient suppression diode group includes four transient suppression diodes D75, D76, D82, and D83 connected in parallel. In the embodiment of the present application, the four transient suppression diodes D75, D76, D82, and D83 can absorb electromagnetic induction voltage in a static state, thereby protecting the driving chip of the motor.

[0063] Reference Figure 4 In the embodiment of the present application, the first filter circuit module 250 includes a first capacitor group, and the first capacitor group includes a plurality of capacitors connected in parallel. The first end of the first capacitor group is connected between the voltage absorption circuit module 240 and the driver chip 210, and the second end of the first capacitor group is grounded DGND.

[0064] Similarly, in the embodiment of the present application, the number of capacitors included in the first capacitor group is related to the connected motor. For example, if a single-phase stepper motor is connected, the corresponding first capacitor group includes 2 capacitors in parallel. If a two-phase stepper motor is connected, the first capacitor group includes 4 capacitors in parallel. If a three-phase stepper motor is connected, the first capacitor group includes 6 capacitors in parallel.

[0065] For example, Figure 4 As shown, the connected motor is a two-phase four-wire stepper motor. At this time, the first capacitor group includes four capacitors C259, C251, C240, and C228 in parallel. In the embodiment of the present application, the four capacitors C259, C251, C240, and C228 can all be chip ceramic capacitors for filtering the phase noise of the motor.

[0066] Reference Figure 4 In the embodiment of the present application, the second filter circuit module 260 includes a first magnetic bead group, the first magnetic bead group includes a plurality of second magnetic beads, and each second magnetic bead is connected between the driving chip 210 and the first filter circuit module 250 .

[0067] Similarly, in the embodiment of the present application, the number of magnetic beads included in the first magnetic bead group is related to the connected motor. For example, if a single-phase stepper motor is connected, the corresponding first magnetic bead group includes 2 magnetic beads. If a two-phase stepper motor is connected, the first magnetic bead group includes 4 magnetic beads. If a three-phase stepper motor is connected, the first magnetic bead group includes 6 magnetic beads.

[0068] For example, Figure 4 As shown, the connected motor is a two-phase four-wire stepper motor. At this time, the first magnetic bead group includes four magnetic beads FB23, FB24, FB29, and FB32, each of which is connected between the driver chip 210 and the first filter circuit module 250. In the embodiment of the present application, the four magnetic beads FB23, FB24, FB29, and FB32 can be used to absorb the motor phase noise.

[0069] Reference Figure 4 In the embodiment of the present application, the sampling circuit module 270 is connected to the driver chip 210, and the sampling circuit module 270 includes a first resistor R330 and a second resistor R357. The first end of the first resistor R330 is connected to the driver chip 210, and the second end of the first resistor R330 is grounded DGND. The first end of the second resistor R357 is connected to the driver chip 210, and the second end of the second resistor R357 is grounded DGND.

[0070] In the embodiment of the present application, the first resistor R330 and the second resistor R357 may be chip resistors, which are used to sample the current of different phases of the motor.

[0071] Reference Figure 4 In the embodiment of the present application, the voltage driving circuit module 280 is connected to the driving chip 210, and the voltage driving circuit module 280 includes a first capacitor C224 and a second capacitor C377. The first end of the first capacitor C224 and the second end of the first capacitor C224 are both connected to the driving chip 210; the first end of the second capacitor C377 and the second end of the second capacitor C377 are both connected to the driving chip 210.

[0072] In the embodiment of the present application, the first capacitor C224 and the second capacitor C377 may be chip ceramic capacitors, and are pump boost capacitors for providing a high-end MOS drive voltage.

[0073] Reference Figure 4In the embodiment of the present application, the first end of the decoupling circuit module 290 is connected to the driving chip 210, and the second end of the decoupling circuit module 290 is connected to the first end of the isolation circuit module 220. The decoupling circuit module 290 includes a third capacitor C226, a fourth capacitor C250, a fifth capacitor C375 and a sixth capacitor C217. The first end of the third capacitor C226 is connected between the driving chip 210 and the first end of the isolation circuit module 220, and the second end of the third capacitor C226 is grounded DGND. The first end of the fourth capacitor C250 is connected between the driving chip 210 and the first end of the isolation circuit module 220, and the second end of the fourth capacitor C250 is connected to the second end of the third capacitor C226 and is grounded DGND together. The first end of the fifth capacitor C375 is connected between the driving chip 210 and the first end of the isolation circuit module 220, and the second end of the fifth capacitor C375 is connected to the second end of the fourth capacitor C250 and is grounded DGND together. A first end of the sixth capacitor C217 is connected between the driving chip 210 and the first end of the isolation circuit module 220 , and a second end of the sixth capacitor C217 is connected to the second end of the fifth capacitor C375 and then connected to the ground DGDN.

[0074] In the embodiment of the present application, the third capacitor C226, the fourth capacitor C250, the fifth capacitor C375 and the sixth capacitor C217 may be chip ceramic capacitors, which are used to provide decoupling for the driving power supply of the driving chip.

[0075] Reference Figure 5 , Figure 5 is a schematic diagram of the motor winding drive voltage waveform provided by the embodiment of the present application. Figure 5 As shown, after Figure 4 After the motor drive circuit shown, the directional electromotive force generated by the motor rotation is absorbed and the voltage remains stable.

[0076] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0077] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0078] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A motor drive circuit, characterized in that: It includes a driving power supply, a driving chip, an isolation circuit module and a discharge protection circuit module, wherein: The first end of the isolation circuit module is connected to a first voltage and the driving chip, and the second end of the isolation circuit module is connected to the driving power supply, and the first voltage is generated based on the reverse electromotive force generated by the rotation of the motor; The isolation circuit module is used to isolate the first voltage from the driving power supply so that the first voltage does not flow back to the driving power supply; A first end of the discharge protection circuit module is connected to the driving chip, a second end of the discharge protection circuit module is connected to the motor, a third end of the discharge protection circuit module is connected to the first voltage, and a fourth end of the discharge protection circuit module is connected to a ground line; The discharge protection circuit module is used to discharge the forward peak voltage generated by the rotation of the motor to the first voltage, and to discharge the reverse peak voltage generated by the rotation of the motor to the ground line.

2. The motor drive circuit according to claim 1, characterized in that: The isolation circuit module includes a first diode and a first magnetic bead; A first end of the first diode is connected to the first voltage and the driving chip, a second end of the first diode is connected to a first end of the first magnetic bead, and a second end of the first magnetic bead is connected to the driving power supply.

3. The motor drive circuit according to claim 1, characterized in that: The discharge protection circuit module includes a first diode group and a second diode group, and the first diode group and the second diode group each include a plurality of diodes connected in parallel; A first end of the first diode group is connected to the motor, and a second end of the first diode group is connected to the first voltage; A first end of the second diode group is connected to the motor, and a second end of the second diode group is connected to the ground line.

4. The motor drive circuit according to claim 1, characterized in that: The motor drive circuit further includes a voltage absorption circuit module, the voltage absorption circuit module includes a transient suppression diode group, and the transient suppression diode group includes a plurality of transient suppression diodes connected in parallel; A first end of the transient suppression diode group is connected between the discharge protection circuit module and the driving chip, and a second end of the transient suppression diode group is grounded.

5. The motor drive circuit according to claim 4, characterized in that: The motor drive circuit further includes a first filter circuit module, the first filter circuit module includes a first capacitor group, and the first capacitor group includes a plurality of capacitors connected in parallel; A first end of the first capacitor group is connected between the voltage absorption circuit module and the driving chip, and a second end of the first capacitor group is grounded.

6. The motor drive circuit according to claim 5, characterized in that: The motor driving circuit also includes a second filtering circuit module, the second filtering circuit module includes a first magnetic bead group, the first magnetic bead group includes a plurality of second magnetic beads, and each of the second magnetic beads is connected between the driving chip and the first filtering circuit module.

7. The motor drive circuit according to claim 1, characterized in that: The motor driving circuit further comprises a sampling circuit module, and the sampling circuit module is connected to the driving chip; The sampling circuit module includes a first resistor and a second resistor; A first end of the first resistor is connected to the driving chip, and a second end of the first resistor is grounded; A first end of the second resistor is connected to the driving chip, and a second end of the second resistor is grounded.

8. The motor drive circuit according to claim 1, characterized in that: The motor driving circuit further comprises a voltage driving circuit module, and the voltage driving circuit module is connected to the driving chip; The voltage driving circuit module includes a first capacitor and a second capacitor; The first end of the first capacitor and the second end of the first capacitor are both connected to the driving chip; The first end of the second capacitor and the second end of the second capacitor are both connected to the driving chip.

9. The motor drive circuit according to claim 1, characterized in that: The motor driving circuit further comprises a decoupling circuit module, a first end of the decoupling circuit module is connected to the driving chip, and a second end of the decoupling circuit module is connected to the first end of the isolation circuit module.

10. The motor driving circuit according to claim 9, characterized in that: The decoupling circuit module includes a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor; The first end of the third capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the third capacitor is grounded; The first end of the fourth capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the fourth capacitor is connected to the second end of the third capacitor and then grounded together; The first end of the fifth capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the fifth capacitor is connected to the second end of the fourth capacitor and then grounded together; The first end of the sixth capacitor is connected between the driving chip and the first end of the isolation circuit module, and the second end of the sixth capacitor is connected to the second end of the fifth capacitor and grounded together.

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