Motor drive circuit and electronic device

Abstract

The application provides a motor driving circuit and electronic equipment, the motor driving circuit, including control module, power supply module, drive module, isolation protection circuit and damping matching module.Under the condition of power-on, the control module realizes the power-on control of the power supply module; the one-way transmission module unidirectionally outputs the power supply signal to the drive module and the damping matching module, and the current cannot be reversely input to the power supply module, so that isolation protection is realized; the damping matching module disconnects the connection of the power supply end of the drive module when the whole machine is powered on, and provides a ground impedance for the power supply end of the drive module when the whole machine is powered off, so that the motor rotation during power-off is provided with damping. The damping scheme provided by the application for the motor during power-off does not need to increase mechanical structures, simultaneously provides isolation protection for the motor driving circuit, reduces the cost, and also guarantees the reliability.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and in particular relates to a motor drive circuit and electronic device. Background Technology

[0002] In current gimbal designs, stepper motors are generally used for driving. Stepper motors are further divided into permanent magnet, hybrid, and reactive stepper motors. Unlike permanent magnet motors, which exhibit significant resistance during rotation, hybrid and reactive motors do not provide the same tactile feedback. Permanent magnet motors offer a smooth, resistance-free rotation without any holding force, a stark contrast to the feel of permanent magnet motors. Therefore, we aim to achieve a similar level of resistance in the overall gimbal design as permanent magnet motors. Currently, there are two common industry practices: one involves adding gear sets and damping oil to generate damping, which increases costs; the other involves adding a return circuit between the motor and the driver chip. The motor's rotation always generates a resistance force opposite to the direction of motion, creating the tactile feedback. However, if the driver chip or other components have low voltage tolerance, the high voltage generated during rotation can damage them, causing circuit failure. Utility Model Content

[0003] The purpose of this application is to provide a motor drive circuit and electronic device that aims to solve the problems of increased cost or low reliability of traditional motor damping adjustment schemes.

[0004] In a first aspect, embodiments of this application provide a motor drive circuit, including a control module, a power supply module, a drive module, a unidirectional transmission module, and a damping matching module; The control module is connected to the power supply and the drive module. The drive module is connected to the motor. The control module is used to control the drive module to output drive signals to drive the motor to rotate. A power supply module, connected to the power supply and the control module, is used to output a power supply signal based on the power supply when the control module is enabled; A unidirectional transmission module is connected to the power supply terminal of the power supply module and the drive module and the damping matching module, and is used to output the power supply signal unidirectionally; The damping matching module is connected to the power supply, the unidirectional transmission module, and the power supply terminal of the drive module. It is used to disconnect the connection with the power supply terminal of the drive module when powered on and to configure the grounding impedance of the power supply terminal of the drive module when powered off.

[0005] In some embodiments, the damping matching module includes a switching unit, an impedance unit, and a power supply unit. The switching unit includes a first terminal, a second terminal, a floating terminal, and a control terminal. The control terminal of the switching unit is connected to the power supply unit. The first terminal of the switching unit is connected to the output terminal of the unidirectional transmission module and the power supply terminal of the drive module. The second terminal of the switching unit is grounded through the impedance unit. When the power supply unit is powered on, the switching unit connects the first terminal to the floating terminal. When the power supply unit is powered off, the switching unit connects the first terminal to the second terminal.

[0006] In some embodiments, the power supply unit includes a first capacitor, a first diode, and a first switching transistor. The first terminal of the first capacitor is connected to the first power supply and the power supply terminal of the switching unit. The second terminal of the first capacitor is connected to the control terminal of the switching unit. The anode and cathode of the first diode are respectively connected to the second terminal and the first terminal of the first capacitor. The first terminal of the first switching transistor is connected to the control terminal of the switching unit. The second terminal of the first switching transistor is grounded. The control terminal of the first switching transistor is connected to the first power supply or the control module.

[0007] In some embodiments, the switching unit includes a relay, and the moving contact, normally closed contact, normally open contact, first end of coil, and second end of coil of the relay respectively constitute the first end, second end, floating end, power supply end, and control end of the switching unit.

[0008] In some embodiments, the impedance unit includes a resistor and an overcurrent protection device, the resistor and the overcurrent protection device being connected in series between the second terminal of the switching unit and ground.

[0009] In some embodiments, the resistor includes a potentiometer.

[0010] In some embodiments, the unidirectional transmission module includes a unidirectional conduction device, the input of which is connected to the power supply module, and the output of which is connected to the power supply of the drive module and the damping matching module.

[0011] In some embodiments, the unidirectional conducting device includes a diode, wherein the anode and cathode of the diode constitute the input terminal and output terminal of the unidirectional conducting device, respectively.

[0012] In some embodiments, the power supply module includes a first switch unit and a second switch unit. The control terminal of the first switch unit is connected to the control module. The first end of the first switch unit is connected to the second power supply and the control terminal of the second switch unit. The second end of the first switch unit is grounded. The first end of the second switch unit is connected to the second power supply. The second end of the second switch unit constitutes the output terminal of the power supply module and is connected to the unidirectional transmission module 140.

[0013] Secondly, embodiments of this application provide an electronic device, including: At least one motor; and The motor drive circuit described above is connected to the motor.

[0014] The beneficial effects of this application embodiment compared to related technologies are as follows: The motor drive circuit provided in this application embodiment includes a control module, a power supply module, a drive module, an isolation protection circuit, and a damping matching module. When powered on, the control module controls the power supply module's power-on; the unidirectional transmission module outputs the power supply signal unidirectionally to the drive module and the damping matching module, preventing current from being input back to the power supply module, thus achieving isolation protection; the damping matching module disconnects from the power supply terminal of the drive module when the entire machine is powered on, and provides a grounding impedance to the power supply terminal of the drive module when the entire machine is powered off, enabling damping for the motor's rotation after power failure. This application embodiment's solution for providing damping to a powered-off motor eliminates the need for additional mechanical structures, while simultaneously providing isolation protection for the motor drive circuit, reducing costs while ensuring reliability.

[0015] The aforementioned electronic device possesses the beneficial effects of the solution provided in the first aspect, which will not be elaborated further here. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a motor drive circuit provided in an embodiment of this application; Figure 2 This is a circuit diagram of a motor drive circuit provided in one embodiment of this application. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0021] For example, in high-speed ball head systems using hybrid motors as the drive mechanism, the weak magnetism of the hybrid motor's internal rotor results in a lack of noticeable damping when manually rotating the gimbal (typically after power-off). Furthermore, during transport or handling, the gimbal can become too slippery, causing it to wobble and potentially collide with other objects, damaging the prototype. To address this, this application provides a motor drive circuit applicable to hybrid motors. This circuit creates rotational resistance to the powered motor, increasing the damping feel and preventing wobble or collisions during transport or handling, thus improving reliability.

[0022] Please see Figure 1 The present application provides a motor drive circuit, including a control module 110, a power supply module 120, a drive module 130, a unidirectional transmission module 140, and a damping matching module 150. The control module 110 is connected to the power supply VCC and the drive module 130. The drive module 130 is connected to the motor 200. The control module 110 is used to control the drive module 130 to output drive signals to drive the motor 200 to rotate. The power supply module 120 is connected to the power supply VCC and the control module 110, and is used to output a power supply signal based on the power supply VCC when the control module 110 is enabled. The unidirectional transmission module 140 is connected to the power supply terminal of the power supply module 120 and the drive module 130 and the damping matching module 150, and is used to output the power supply signal unidirectionally. The damping matching module 150 is connected to the power supply VCC, the unidirectional transmission module 140 and the power supply terminal of the drive module 130. It is used to disconnect the connection with the power supply terminal Pwr of the drive module 130 when powered on and to configure the grounding impedance of the power supply terminal Pwr of the drive module 130 when powered off.

[0023] The power supply VCC can be a power interface or a power circuit, serving as the power supply for the motor drive circuit. The control module 110 is, for example, a microprocessor.

[0024] The drive module 130 is matched with the drive chip of the motor 200. Its controlled end is connected to the control module 110, and its drive end is connected to the motor 200.

[0025] The power supply module 120 can be a voltage conversion circuit that converts the power signal provided by the power supply VCC into a voltage power supply signal, such as boosting or bucking. The power supply module 120 can also be a switching circuit, whereby the control module 110 enables and controls the power supply module 120 to switch on and off, thereby controlling the power supply module 120 to output or disconnect the power supply signal based on the power supply output.

[0026] In the technical solution of this application embodiment, when powered on, the control module 110 controls the power supply module 120 to power on; the unidirectional transmission module 140 outputs the power supply signal unidirectionally to the drive module 130 and the damping matching module 150, preventing the current from being input back to the power supply module 120, thus achieving isolation protection; when the whole machine is powered on, the damping matching module 150 disconnects the connection with the power supply terminal Pwr of the drive module 130, and when the whole machine is powered off, it provides a grounding impedance to the power supply terminal Pwr of the drive module 130. According to the principles of electromagnetism, the greater the current, the greater the magnetic force. When powered off, the current value in the coil circuit of the motor 200 is determined by the grounding resistance. The smaller the total resistance, the greater the current and the greater the magnetic force. The magnetic force can be changed by altering the total resistance value, thus affecting the ease of manual rotation. This application embodiment creates rotational resistance for the powered-off motor 200 without adding mechanical structures, while providing isolation protection for the motor drive circuit, reducing costs while ensuring reliability.

[0027] Please see Figure 2In some embodiments, the damping matching module 150 includes a switching unit 151, an impedance unit 152, and a power supply unit 153. The switching unit 151 includes a first terminal A, a second terminal B, a floating terminal C, and a control terminal D. The control terminal D of the switching unit 151 is connected to the power supply unit 153. The first terminal A of the switching unit 151 is connected to the output terminal of the unidirectional transmission module 140 and the power supply terminal Pwr of the drive module 130. The second terminal B of the switching unit 151 is grounded through the impedance unit 152.

[0028] When the power supply unit 153 is powered on, the switching unit 151 connects the first terminal A to the floating terminal C, thereby disconnecting the impedance unit 152 from the power supply terminal Pwr of the drive module 130. This ensures that the power supply signal output by the unidirectional transmission module 140 is only output to the power supply terminal Pwr of the drive module 130. When the power supply unit 153 is powered off, the switching unit 151 connects the first terminal A to the second terminal B, thereby connecting the power supply terminal Pwr of the drive module 130 to the impedance unit 152 and configuring a grounding impedance for the power supply terminal Pwr of the drive module 130.

[0029] It is understood that the impedance unit 152 can be a fixed impedance or an adjustable impedance. The technical solution of this application embodiment connects a grounding impedance to the power supply terminal Pwr of the drive module 130 when the power is off, thereby achieving a low-cost and highly reliable design for the rotational resistance of the motor 200 when the power is off.

[0030] In some embodiments, the power supply unit 153 includes a first capacitor C1, a first diode D1, and a first switching transistor Q1. The first end of the first capacitor C1 is connected to the first power supply V1 and the power supply terminal of the switching unit 151. The second end of the first capacitor C1 is connected to the control terminal of the switching unit 151. The anode and cathode of the first diode D1 are respectively connected to the second end and the first end of the first capacitor C1. The first end of the first switching transistor Q1 is connected to the control terminal of the switching unit 151. The second end of the first switching transistor Q1 is grounded. The control terminal of the first switching transistor Q1 is connected to the first power supply V1 or the control module 110.

[0031] It is understood that the first power supply V1 can be the aforementioned power supply VCC, or it can be a power signal obtained by voltage transformation of the aforementioned power supply VCC. For example, the first switching transistor Q1 is an NPN transistor. The first terminal, the second terminal, and the control terminal of the first switching transistor Q1 are the collector, emitter, and base of the NPN transistor, respectively. Therefore, it can be turned on by a high-level signal, which can be provided by the first power supply V1 or the control module 110. Figure 2 In the illustrated embodiment, the high level is provided by a first power supply V1.

[0032] In some embodiments, the power supply unit 153 further includes a current-limiting resistor R1, a filter capacitor C2, and a bias resistor R2. The current-limiting resistor R1 is connected in series with the control terminal of the first switching transistor Q1. The first terminal of the filter capacitor C2 and the first terminal of the bias resistor R2 are connected to the control terminal of the first switching transistor Q1, and the second terminal of the filter capacitor C2 and the second terminal of the bias resistor R2 are grounded. The current-limiting resistor R1 and the filter capacitor C2 constitute a filter circuit. The bias resistor R2 is used to provide bias to the control terminal of the first switching transistor Q1.

[0033] In some embodiments, the switching unit 151 includes a relay, and the moving contact, normally closed contact, normally open contact, first end of coil K, and second end of coil K of the relay respectively constitute the first end A, second end B, floating end C, control end D, and power supply end E of the switching unit 151.

[0034] Understandably, the moving contact, normally closed contact, and normally open contact of the relay constitute a single-pole double-ended switch. The first end of the coil K is connected to the first power supply V1, and the second end of the coil K is connected to the second end of the first switching transistor Q1. When the first power supply V1 is powered on, the first switching transistor Q1 is turned on, and the relay coil K is turned on, causing the moving contact of the relay to connect with the normally open contact, thus disconnecting the connection with the impedance unit 152, so that the power supply terminal Pwr of the drive module 130 is not connected to the grounding resistor. When the first power supply V1 is powered off, the first switching transistor Q1 is turned off, and the moving contact of the relay connects with the normally closed contact, thus connecting the impedance unit 152, so that the power supply terminal Pwr of the drive module 130 is connected to the grounding impedance, providing rotational damping for the powered-off motor 200.

[0035] In some embodiments, the impedance unit 152 includes a resistor R0 and an overcurrent protection device F1, which are connected in series between the second terminal of the switching unit 151 and ground. For example, the resistor R0 includes a potentiometer, which allows the user to adjust the grounding impedance of the power supply terminal Pwr of the drive module 130 to adjust the rotational damping of the powered motor 200. The overcurrent protection device F1 is, for example, a fuse, which protects against magnetic abnormalities; if the current is too high, it will melt, and the electromagnetic resistance will disappear. Furthermore, the motor 200 can still operate normally even in failure scenarios such as damage to relay hardware. In other embodiments, the overcurrent protection device F1 can also be a protective device such as a positive temperature coefficient thermistor (PTC).

[0036] In some embodiments, the unidirectional transmission module 140 includes a unidirectional conducting device D2, the input of which is connected to the power supply module 120, and the output of which is connected to the power supply terminal Pwr of the drive module 130 and the damping matching module 150.

[0037] In some embodiments, the unidirectional conducting device D2 includes a diode, the anode and cathode of which constitute the input and output terminals of the unidirectional conducting device D2, respectively. Exemplarily, the diode is a general-purpose diode or a Schottky diode.

[0038] In some embodiments, the power supply module 120 includes a first switch unit 121 and a second switch unit 122. The control terminal of the first switch unit 121 is connected to the control module 110. The first end of the first switch unit 121 is connected to the second power supply V2 and the control terminal of the second switch unit 122. The second end of the first switch unit 121 is grounded. The first end of the second switch unit 122 is connected to the second power supply V2. The second end of the second switch unit 122 constitutes the output terminal of the power supply module 120 and is connected to the unidirectional transmission module 140.

[0039] For example, the first switching unit 121 includes a switching transistor Q2, a resistor R3, a resistor R4, and a capacitor C3. The first end of the resistor R3 and the first end of the resistor R4 are connected together to form the first end of the first switching unit 121. The capacitor C3 is connected in parallel with the resistor R3. The second end of the resistor R4 is connected to the control terminal of the switching transistor Q2. The first end of the switching transistor Q2 forms the first end of the first switching unit 121. It is connected to the second power supply V2 through the pull-up resistor R5. The second end of the switching transistor Q2 is grounded.

[0040] For example, the second switching unit 122 includes resistors R6 and R7, capacitors C4 and C5, and a switching transistor Q3. The first end of resistor R6 constitutes the first end of the second switching unit 122, and the second end of resistor R6 is connected to the control end of the switching transistor Q3. Resistor R7 is connected between the control end and the first end of the switching transistor Q3. Capacitor C4 is connected in parallel with resistor R7. The first end of the switching transistor Q3 constitutes the first end of the second switching unit 122 and is connected to the second power supply V2. The second end of the switching transistor Q3 constitutes the second end of the second switching unit 122 and is grounded through capacitor C5.

[0041] For example, the second power supply V2 can be the aforementioned power supply VCC, or it can be a power signal obtained by voltage transformation of the aforementioned power supply VCC. Switch Q2 is an NPN transistor, with its first terminal, second terminal, and control terminal being the collector of the NPN transistor, respectively. Switch Q3 is a P-channel MOSFET, with its first terminal, second terminal, and control terminal being the source, drain, and gate of the MOSFET, respectively. It is understood that switches Q1, Q2, and Q3 can also be other electronic switches. This application does not impose restrictions on the selection of switch transistors, as long as they can be compatible with the control logic of this application.

[0042] It is understandable that the number of driving contacts, normally closed contacts, and normally open contacts of the relays in the unidirectional transmission module 140, the unidirectional conduction device D2 of the unidirectional transmission module 140, and the switch unit 151 is not limited to the following: Figure 2 As shown in one example, in other examples, the number of the above-mentioned components should correspond to the number of motors 200, and there can be more than two of them.

[0043] Secondly, embodiments of this application provide an electronic device, including: At least one motor 200; and The motor drive circuit shown above is connected to motor 200.

[0044] Among them, motor 200 is, for example, a stepper motor, such as a hybrid or reactive motor. Electronic devices include, for example, gimbal devices, camera devices, robotic devices, and any other devices that require the use of stepper motors.

[0045] Combination Figure 2 When the electronic device is powered on by power supply VCC, the control module 110 has already started and continuously outputs a high level to the power supply module 120. This means that the power supply is continuously pulled high during the power-on state, at which point the switching transistor Q2 is turned on, pulling the gate of the switching transistor Q3 low. At this time, the switching transistor Q3 is also turned on. The second power supply V2 is connected to the drain of the switching transistor Q3, which is the anode of the diode (i.e., the unidirectional conducting device D2). Since the diode can only conduct in the forward direction, the second power supply V2 is input to the power supply terminal Pwr of the drive module 130 through the diode, thus powering the drive module 130. Meanwhile, in the damping matching module 150, since the first power supply V1 supplies power to the first switching transistor Q1 during power-on, the first switching transistor Q1 is turned on. The magnetic core of the relay is energized and generates magnetism, pulling the throw knife to the floating terminal C, placing it in a floating state, thereby protecting the power supply grounding resistor on the drive module 130.

[0046] When the electronic device is powered off (VCC is off), there is no power supply from VCC. Switch Q2 is on, and switch Q3 is off. The power supply module 120 is not working, meaning there is no power signal transmitted through the unidirectional transmission module 140 to the power supply terminal of the drive module 130 and the damping matching module 150. In the damping matching module 150 at this time, the first switch Q1 is also off. The relay core has no magnetism and cannot attract the throwing knife. The throwing knife will be in the default state, i.e., in contact with the first terminal A. At this time, the power supply terminal Pwr of the drive module 130 will be connected to ground through the relay and resistor R0, forming a return path. At this time, by changing the resistance value of resistor R0, the current through the power supply terminal Pwr of the drive module 130 to ground can be adjusted, thereby changing and adjusting the damping magnitude.

[0047] Exemplarily, when the electronic device is in the power-on state of the power supply VCC, the on and off of the switching transistor Q2 is controlled by the control module 110. At the beginning, the gate-source voltage Vgs of the switching transistor Q3 is less than Vth, and the switching transistor Q3 is turned off at this time. When the control module 110 outputs a high level to the switching transistor Q2, the switching transistor Q2 is turned on, the gate of the switching transistor Q3 is connected to the ground and will be at a low level. At this time, the Vgs of the switching transistor Q3 is greater than Vth, the switching transistor Q3 is turned on, and the second power supply V2 is conducted to the drain.

[0048] At the same time, through reasonable design of the power-on sequence, it is ensured that the damping path of the motor 200 will not affect the normal working path.

[0049] The sequence is as follows: During power-on: the first power supply V1 is powered on, for example, 3.3V, so that the first switching transistor Q1 is turned on, and the moving contact of the relay is switched from contacting the normally closed contact to contacting the normally open contact. After a certain delay, the control module 110 outputs a high level to the switching transistor Q2, so that the switching transistor Q2 is turned on and the switching transistor Q3 is turned on, and the motor 200 starts to be powered normally. At this time, the damping matching module 150 disconnects from the power terminal Pwr of the driving module 130. The purpose of setting the aforementioned certain delay is to ensure that the relay completes stable switching within this time period.

[0050] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for part of the technical features therein; these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the various embodiments of the present application, and all shall be included in the protection scope of the present application.

Claims

1. A motor drive circuit, characterized in that, It includes a control module, a power supply module, a drive module, a unidirectional transmission module, and a damping matching module; The control module is connected to the power supply and the drive module. The drive module is connected to the motor. The control module is used to control the drive module to output drive signals to drive the motor to rotate. A power supply module, connected to the power supply and the control module, is used to output a power supply signal based on the power supply when the control module is enabled; A unidirectional transmission module is connected to the power supply terminal of the power supply module and the drive module and the damping matching module, and is used to output the power supply signal unidirectionally; The damping matching module is connected to the power supply, the unidirectional transmission module, and the power supply terminal of the drive module. It is used to disconnect the connection with the power supply terminal of the drive module when powered on and to configure the grounding impedance of the power supply terminal of the drive module when powered off.

2. The motor drive circuit as described in claim 1, characterized in that, The damping matching module includes a switching unit, an impedance unit, and a power supply unit. The switching unit includes a first terminal, a second terminal, a floating terminal, and a control terminal. The control terminal of the switching unit is connected to the power supply unit. The first terminal of the switching unit is connected to the output terminal of the unidirectional transmission module and the power supply terminal of the drive module. The second terminal of the switching unit is grounded through the impedance unit. When the power supply unit is powered on, the switching unit connects the first terminal to the floating terminal. When the power supply unit is powered off, the switching unit connects the first terminal to the second terminal.

3. The motor drive circuit as described in claim 2, characterized in that, The power supply unit includes a first capacitor, a first diode, and a first switching transistor. The first end of the first capacitor is connected to the first power supply and the power supply terminal of the switching unit. The second end of the first capacitor is connected to the control terminal of the switching unit. The anode and cathode of the first diode are respectively connected to the second end and the first end of the first capacitor. The first end of the first switching transistor is connected to the control terminal of the switching unit. The second end of the first switching transistor is grounded. The control terminal of the first switching transistor is connected to the first power supply or the control module.

4. The motor drive circuit as described in claim 2, characterized in that, The switching unit includes a relay, and the moving contact, normally closed contact, normally open contact, first end of the coil, and second end of the coil of the relay respectively constitute the first end, second end, floating end, power supply end, and control end of the switching unit.

5. The motor drive circuit as described in claim 2, characterized in that, The impedance unit includes a resistor and an overcurrent protection device, which are connected in series between the second terminal of the switching unit and ground.

6. The motor drive circuit as described in claim 5, characterized in that, The resistor includes a potentiometer.

7. The motor drive circuit according to any one of claims 1 to 6, characterized in that, The unidirectional transmission module includes a unidirectional conduction device. The input terminal of the unidirectional conduction device is connected to the power supply module, and the output terminal is connected to the power supply terminal of the drive module and the damping matching module.

8. The motor drive circuit as described in claim 7, characterized in that, The unidirectional conducting device includes a diode, and the anode and cathode of the diode constitute the input terminal and output terminal of the unidirectional conducting device, respectively.

9. The motor drive circuit according to any one of claims 1 to 6, characterized in that, The power supply module includes a first switch unit and a second switch unit. The control terminal of the first switch unit is connected to the control module. The first end of the first switch unit is connected to the second power supply and the control terminal of the second switch unit. The second end of the first switch unit is grounded. The first end of the second switch unit is connected to the second power supply. The second end of the second switch unit constitutes the output terminal of the power supply module and is connected to the unidirectional transmission module 140.

10. An electronic device, characterized in that, include: At least one motor; as well as The motor drive circuit according to any one of claims 1 to 9, wherein the motor drive circuit is connected to the motor.

Images