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CN-224233575-U - Motor driving circuit

CN224233575UCN 224233575 UCN224233575 UCN 224233575UCN-224233575-U

Abstract

The present disclosure provides a motor driving circuit. The motor driving circuit comprises a switch module, an isolation module and a communication module, wherein the switch module is used for switching on a motor and a power supply under the condition of conducting and disconnecting the motor from the power supply under the condition of switching off, the isolation module is connected with the switch module and comprises a photoelectric coupler, the photoelectric coupler comprises a light emitting diode and a phototriode, the light emitting diode receives a power supply control signal and generates or does not generate an optical signal, the phototriode is conducted to conduct the switch module under the condition of receiving the optical signal, the communication module comprises an isolation chip, a transceiver and a differential circuit, the isolation chip is used for receiving and isolating the motor control signal and transmitting the motor control signal to the transceiver, and the transceiver is used for converting the motor control signal into the differential signal and transmitting the differential signal to the motor through the differential circuit.

Inventors

  • CHEN DONG
  • HUANG WEI

Assignees

  • 新光维医疗科技(苏州)股份有限公司

Dates

Publication Date
20260512
Application Date
20250427

Claims (10)

  1. 1. A motor drive circuit, characterized by comprising: the switch module is used for switching on the motor and the power supply under the condition of being conducted and disconnecting the motor from the power supply under the condition of being switched off; The isolation module is connected with the switch module and comprises a photoelectric coupler, the photoelectric coupler comprises a light emitting diode and a phototriode, the light emitting diode receives a power supply control signal and generates or does not generate a light signal, the phototriode is conducted to conduct the switch module under the condition of receiving the light signal, and the phototriode is connected with the switch module through the light source control signal The communication module comprises an isolation chip, a transceiver and a differential circuit, wherein the isolation chip is used for receiving and isolating motor control signals and sending the motor control signals to the transceiver, and the transceiver is used for converting the motor control signals into differential signals and transmitting the differential signals to the motor through the differential circuit.
  2. 2. The motor drive circuit according to claim 1, wherein the switching module includes a transistor, a first resistor, and a second resistor, a gate of the transistor is connected to one end of the first resistor, the other end of the first resistor is grounded through the isolation module, a source of the transistor is connected to the power source, a drain of the transistor is connectable to the motor, one end of the second resistor is connected to the gate, and the other end of the second resistor is connected to the source.
  3. 3. The motor drive circuit of claim 2, further comprising a filter module, wherein the filter module comprises a first capacitor and a second capacitor connected in parallel, one end of the filter module is connected to the source, and the other end of the filter module is grounded.
  4. 4. The motor drive circuit of claim 1, wherein the isolation module further comprises a third resistor, wherein a cathode of the light emitting diode is used for being connected to the power control signal through the third resistor, an anode of the light emitting diode is used for being connected to a device power supply, an emitter of the phototransistor is grounded, and a collector of the phototransistor is connected to the switching module.
  5. 5. The motor drive circuit of claim 1, wherein the differential circuit comprises a first circuit and a second circuit, the communication module further comprising a common-mode inductance comprising a first coil and a second coil, one of the first coil and the second coil being connected in series in the first circuit, the other of the first coil and the second coil being connected in series in the second circuit.
  6. 6. The motor drive circuit of claim 1, wherein the differential circuit comprises a first circuit and a second circuit, the communication module further comprising a dual channel TVS diode connected in parallel between the first circuit and the second circuit.
  7. 7. The motor drive circuit according to claim 1, wherein the differential circuit includes a first circuit and a second circuit, the communication module further includes a third capacitor and a fourth capacitor, one end of the third capacitor is connected to one of the first circuit and the second circuit, the other end of the third capacitor is grounded, one end of the fourth capacitor is connected to the other of the first circuit and the second circuit, and the other end of the fourth capacitor is grounded.
  8. 8. The motor drive circuit according to claim 1, further comprising a detection module, wherein one end of the detection module is connected to the switch module, and the other end of the detection module is connected to the motor, and the detection module is configured to detect a power supply state of the motor.
  9. 9. The motor drive circuit according to claim 8, wherein the detection module includes a fourth resistor connected in series between the switching module and the motor, and a current detection circuit connected in parallel with the fourth resistor for detecting a current value flowing through the fourth resistor; Optionally, the motor driving circuit further includes a bidirectional TVS diode, one end of the bidirectional TVS diode is connected to the other end of the detection module, and the other end of the bidirectional TVS diode is grounded; Optionally, the motor driving circuit further includes a fifth capacitor and a sixth capacitor, and the fifth capacitor and the sixth capacitor are respectively connected in parallel with the bidirectional TVS diode.
  10. 10. The motor drive circuit of claim 1, further comprising a fuse connected in series between the motor and the power source.

Description

Motor driving circuit Technical Field The present disclosure relates to a motor driving circuit. Background The motor driving circuit is widely applied to the fields of industrial control, household appliances, medical equipment and the like and is used for controlling the running state of a motor. In the related art motor driving circuit, a motor is always connected to a power source, and the operation parameters of the motor, such as the rotation speed, the direction, etc., are directly adjusted by a control signal. However, the motor is always connected to the power supply, increasing the risk of damage to the motor and the circuit in case of anomalies, with a lower safety. Disclosure of Invention The present disclosure provides a motor driving circuit. According to one aspect of the present disclosure, there is provided a motor driving circuit including a switching module to turn on a motor and a power supply in case of conduction and to disconnect the connection between the motor and the power supply in case of shutdown, an isolation module connected to the switching module, the isolation module including a photo coupler including a light emitting diode and a phototransistor, the light emitting diode receiving a power control signal and generating or not generating an optical signal, the phototransistor being turned on to turn on the switching module in case of receiving the optical signal, and a communication module including an isolation chip to receive and isolate a motor control signal and to transmit the motor control signal to the transceiver, the transceiver to convert the motor control signal into a differential signal and transmit the differential signal to the motor through the differential circuit. According to the technical scheme of one aspect, through the cooperative work of the switch module, the isolation module and the communication module, reliable connection and disconnection of the motor and the power supply and effective transmission of motor parameter control signals are realized, so that the safety is improved and the energy consumption is reduced. Meanwhile, the isolation module can realize electrical isolation between the processor side and the switch module side, so that voltage spikes, electromagnetic interference or directional voltage and the like generated in the working process of the circuit are prevented from being transmitted to the processor, and the damage of pins of the processor or unstable system are avoided, thereby enhancing the isolation and safety of the circuit. In addition, the communication module ensures that the motor accurately operates according to the motor parameter control signals, and stability and control precision of the system are improved. According to the motor driving circuit of at least one embodiment of the present disclosure, the switching module includes a transistor, a first resistor, and a second resistor, a gate of the transistor is connected with one end of the first resistor, the other end of the first resistor is grounded through the isolation module, a source of the transistor is connected with the power supply, a drain of the transistor can be connected with the motor, one end of the second resistor is connected with the gate, and the other end of the second resistor is connected with the source. According to the technical scheme of the embodiment, the switch module adopts a structure that the transistor is combined with the first resistor and the second resistor, so that the circuit design is simplified, and the cost is reduced. The voltage division effect of the first resistor and the second resistor stabilizes the grid voltage of the transistor, ensures the reliable on and off of the switch module, and improves the response speed and durability of the circuit. According to the motor driving circuit of at least one embodiment of the present disclosure, the motor driving circuit further comprises a filtering module, the filtering module comprises a first capacitor and a second capacitor connected in parallel, one end of the filtering module is connected with the source electrode, and the other end of the filtering module is grounded. According to the technical scheme of the embodiment, the filtering module effectively filters noise and transient interference of the power input end through the first capacitor and the second capacitor which are connected in parallel, the switch module and the motor are protected, and the anti-interference capability and the service life of the circuit are improved. According to the motor driving circuit of at least one embodiment of the present disclosure, the isolation module further includes a third resistor, a cathode of the light emitting diode is used for being connected to the power control signal through the third resistor, an anode of the light emitting diode is used for being connected to a device power supply, an emitter of the phototransistor is grounded, and a collector of the phototrans