Motor drive circuit

Abstract

The utility model provides a motor driving circuit. The motor driving circuit comprises a switch module which is used for connecting a motor and a power supply under a conduction condition and disconnecting the connection between the motor and the power supply under a disconnection condition; the isolation module is connected with the switch module, the isolation module comprises a photoelectric coupler, the photoelectric coupler comprises a light emitting diode and a phototriode, the light emitting diode receives the power supply control signal and generates or does not generate an optical signal, and the phototriode is conducted under the condition that the phototriode receives the optical signal so as to conduct the switch module; 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 sending the motor control signal to the transceiver, and the transceiver is used for converting the motor control signal into a differential signal and transmitting the differential signal to the motor through the differential circuit.

Description

Technical Field

[0001] This disclosure relates to a motor drive circuit. Background Technology

[0002] Motor drive circuits are widely used in industrial control, home appliances, medical equipment, and other fields to control the operating status of motors. In these circuits, the motor is always connected to the power supply, and its operating parameters, such as speed and direction, are directly adjusted via control signals. However, this constant connection increases the risk of damage to both the motor and the circuitry under abnormal conditions, resulting in lower safety. Summary of the Invention

[0003] This disclosure provides a motor drive circuit.

[0004] According to one aspect of this disclosure, a motor drive circuit is provided, comprising: a switching module for connecting a motor and a power supply when the circuit is on, and disconnecting the connection between the motor and the power supply when the circuit is off; an isolation module connected to the switching module, the isolation module including an optocoupler, the optocoupler including a light-emitting diode and a phototransistor, the light-emitting diode receiving a power control signal and generating or not generating a light signal, the phototransistor conducting to connect the switching module when it receives the light signal; and a communication module including an isolation chip, a transceiver, and a differential circuit, the isolation chip for receiving and isolating a motor control signal and sending the motor control signal to the transceiver, the transceiver for converting the motor control signal into a differential signal and transmitting the differential signal to the motor through the differential circuit.

[0005] According to one technical solution, the coordinated operation of a switching module, an isolation module, and a communication module enables reliable connection and disconnection between the motor and the power supply, as well as effective transmission of motor parameter control signals, thereby improving safety and reducing energy consumption. Simultaneously, the isolation module provides electrical isolation between the processor side and the switching module side, preventing voltage spikes, electromagnetic interference, or directional voltages generated during circuit operation from reaching the processor, which could damage processor pins or cause system instability, thus enhancing circuit isolation and safety. Furthermore, the communication module ensures precise motor operation based on motor parameter control signals, improving system stability and control accuracy.

[0006] According to at least one embodiment of the motor drive circuit of this disclosure, the switching module includes a transistor, a first resistor, and a second resistor. The 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, the source of the transistor is connected to the power supply, and the drain of the transistor can be connected 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.

[0007] According to the technical solution of this embodiment, the switching module adopts a structure combining a transistor with a first resistor and a second resistor, which simplifies the circuit design and reduces costs. The voltage division effect of the first resistor and the second resistor stabilizes the gate voltage of the transistor, ensuring reliable switching on and off of the switching module, and improving the circuit's response speed and durability.

[0008] According to at least one embodiment of the motor drive circuit of the present disclosure, the motor drive circuit further includes a filtering module, the filtering module including a first capacitor and a second capacitor connected in parallel, one end of the filtering module being connected to the source, and the other end of the filtering module being grounded.

[0009] According to the technical solution of this embodiment, the filtering module effectively filters out noise and transient interference at the power input terminal through the parallel connection of the first and second capacitors, protecting the switching module and the motor, and improving the anti-interference capability and service life of the circuit.

[0010] According to at least one embodiment of the motor drive circuit of this disclosure, the isolation module further includes a third resistor, the negative terminal of the light-emitting diode is used to connect to the power control signal through the third resistor, the positive terminal of the light-emitting diode is used to connect to the device power supply, the emitter of the phototransistor is grounded, and the collector of the phototransistor is connected to the switching module.

[0011] According to the technical solution of this embodiment, the third resistor in the isolation module limits the current flowing through the light-emitting diode, thereby protecting the optocoupler from overcurrent damage. At the same time, it optimizes the input stability of the power control signal, further improving the reliability and lifespan of the isolation module.

[0012] According to at least one embodiment of the motor drive circuit of the present disclosure, the differential circuit includes a first circuit and a second circuit, and the communication module further includes a common-mode inductor, the common-mode inductor including a first coil and a second coil, one of the first coil and the second coil being connected in series in the first circuit, and the other of the first coil and the second coil being connected in series in the second circuit.

[0013] According to the technical solution of this embodiment, the common-mode inductor in the differential circuit effectively suppresses common-mode interference through the first coil and the second coil, further improving the stability and reliability of differential signal transmission. It is particularly suitable for motor drive applications in high-noise environments and improves the electromagnetic interference resistance of the differential circuit.

[0014] According to at least one embodiment of the motor drive circuit of this disclosure, the differential circuit includes a first circuit and a second circuit, and the communication module further includes a dual-channel TVS diode connected in parallel between the first circuit and the second circuit.

[0015] According to the technical solution of this embodiment, the dual-channel TVS diodes are connected in parallel between the differential circuits, which can quickly absorb transient overvoltages, protect the communication module from damage by surge voltages, and enhance the robustness and durability of the circuit.

[0016] According to at least one embodiment of the motor drive circuit of this disclosure, the differential circuit includes a first circuit and a second circuit, and 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, and 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.

[0017] According to the technical solution of this embodiment, the setting of the third and fourth capacitors further filters out high-frequency noise in the differential circuit, optimizes signal quality, reduces the risk of signal distortion, improves the accuracy and stability of motor control, and enhances the electromagnetic interference resistance of the differential circuit.

[0018] According to at least one embodiment of the motor drive circuit of the present disclosure, the motor drive circuit further includes a detection module, 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, the detection module being used to detect the power supply status of the motor.

[0019] According to the technical solution of this embodiment, the introduction of the detection module enables real-time monitoring of the power supply status of the motor, which can promptly detect abnormal power connection or faults, providing important support for system fault diagnosis and maintenance, and improving the intelligence level and safety of the circuit.

[0020] According to at least one embodiment of the motor drive circuit of this disclosure, the detection module includes a fourth resistor and a current detection circuit. The fourth resistor is connected in series between the switching module and the motor, and the current detection circuit is connected in parallel with the fourth resistor. The current detection circuit is used to detect the current value flowing through the fourth resistor.

[0021] According to the technical solution of this embodiment, the detection module monitors the current value through a fourth resistor and a current detection circuit, and determines whether the power supply status of the motor is normal based on the current value. This design can quickly identify the deviation between the power control signal and the actual power supply status, enhancing the system's self-diagnostic capability and operational reliability, and improving the system's safety.

[0022] According to at least one embodiment of the motor drive circuit of the present disclosure, the motor drive circuit further includes a bidirectional TVS diode, one end of which is connected to the other end of the detection module, and the other end of which is grounded.

[0023] According to the technical solution of this embodiment, the bidirectional TVS diode effectively absorbs transient overvoltage at the motor end, protects the detection module and the motor from damage caused by voltage surges, and further improves the reliability and safety of the circuit.

[0024] According to at least one embodiment of the motor drive circuit of the present disclosure, the motor drive circuit further includes a fifth capacitor and a sixth capacitor, the fifth capacitor and the sixth capacitor being connected in parallel with the bidirectional TVS diode.

[0025] According to the technical solution of this embodiment, the fifth and sixth capacitors are connected in parallel with the bidirectional TVS diode, which further enhances the anti-interference capability of the circuit, optimizes the transient response characteristics, and extends the service life of key components.

[0026] According to at least one embodiment of the motor drive circuit of the present disclosure, the motor drive circuit further includes a fuse connected in series between the motor and the power supply.

[0027] According to the technical solution of this embodiment, the fuse provides overcurrent protection, which quickly disconnects the power supply from the motor when the current is abnormal, effectively preventing the motor and circuit from being damaged due to overload or short circuit, and improving the overall safety of the system. Attached Figure Description

[0028] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0029] Figure 1 This is a schematic diagram of a motor drive circuit according to one embodiment of the present disclosure. Detailed Implementation

[0030] The present disclosure will now be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0031] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Keeping the motor constantly connected to the power source increases the risk of damage to the motor and circuitry under abnormal conditions (such as power surges or short circuits), resulting in lower safety. Furthermore, the continuous connection between the motor and the power source can lead to unnecessary energy consumption, especially when the motor is in standby mode for extended periods.

[0033] To this end, the present disclosure proposes the following technical solution, wherein the connection and disconnection of the control power supply and the motor are realized by the isolation module control switch module, and the motor parameter control signal is transmitted by the communication module, so that the power supply control and motor parameter control of the motor are independent of each other, and the motor does not need to be connected to the power supply at all times, thereby improving safety and reducing energy consumption.

[0034] The motor drive circuit disclosed herein can be used to drive the motors of devices such as peristaltic pumps and planer handles in medical equipment, thereby improving the safety of medical equipment during use.

[0035] Figure 1 A circuit diagram of a motor drive circuit according to one embodiment of this disclosure is shown. Figure 1 The motor drive circuit 1000 shown includes: a switching module 100, used to connect the motor 2000 and the power supply VCC24 when the circuit is on, and to disconnect the connection between the motor 2000 and the power supply VCC24 when the circuit is off; an isolation module 200, connected to the switching module 100, which receives power control signals and may or may not generate optical signals, the optical signals being used to turn on the switching module 100; and a communication module 300, connected to the motor 2000, which transmits the received motor parameter control signals to the motor 2000 so that the motor 2000 operates according to the motor parameter control signals when the power is on.

[0036] The power supply VCC24 can be a 24V power supply.

[0037] The power control signal indicates whether the motor 2000 and power supply VCC24 are connected. For example, a low level power control signal indicates that the motor 2000 and power supply VCC24 are connected, and a high level power control signal indicates that the connection between the motor 2000 and power supply VCC24 is disconnected; or, a high level power control signal indicates that the motor 2000 and power supply VCC24 are connected, and a low level power control signal indicates that the connection between the motor 2000 and power supply VCC24 is disconnected. A high level can be a voltage level greater than a first voltage threshold, and a low level can be a voltage level less than a second voltage threshold. The first voltage threshold is greater than the second voltage threshold, and the first and second voltage thresholds can be set according to actual conditions.

[0038] The motor parameter control signal can indicate the operating parameters of the motor 2000, such as speed and direction of rotation.

[0039] The power control signal and motor parameter control signal can be generated by a processor (not shown in the figure) and output to the isolation module 200 or the communication module 300. The processor can be integrated into the motor drive circuit 1000 or set up independently of the motor drive circuit 1000; this is not limited here. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0040] The motor drive circuit 1000 of this disclosure, through the coordinated operation of the switching module 100, the isolation module 200, and the communication module 300, achieves reliable connection and disconnection between the motor 2000 and the power supply, as well as effective transmission of motor parameter control signals, thereby improving safety and reducing energy consumption. Simultaneously, the isolation module 200 provides electrical isolation between the processor side and the switching module 100 side, preventing voltage spikes, electromagnetic interference, or directional voltages generated during circuit operation from being transmitted to the processor, which could damage processor pins or cause system instability, thus enhancing the circuit's isolation and safety. Furthermore, the communication module 300 ensures that the motor 2000 operates accurately according to the motor parameter control signals, improving system stability and control precision.

[0041] In some embodiments of this disclosure, the switching module 100 includes a transistor Q3, a first resistor R26, and a second resistor R29. The gate of the transistor Q3 is connected to one end of the first resistor R26, and the other end of the first resistor R26 is grounded through the isolation module 200. The source of the transistor Q3 is connected to the power supply, and the drain of the transistor Q3 can be connected to the motor 2000. One end of the second resistor R29 is connected to the gate, and the other end of the second resistor R29 is connected to the source.

[0042] In one example, transistor Q3 is a p-polarized MOSFET, model AO4485, the first resistor R26 has a resistance of 10kΩ and a package size of 0603, and the second resistor R29 has a resistance of 10kΩ and a package size of 0603.

[0043] The motor drive circuit 1000 described above uses a switching module 100 with transistor Q3 combined with a first resistor R26 and a second resistor R29, which simplifies the circuit design and reduces costs. The voltage divider effect of the first resistor R26 and the second resistor R29 stabilizes the gate voltage of transistor Q3, ensuring reliable turn-on and turn-off of the switching module 100 and improving the circuit's response speed and durability. It is understood that if the first resistor R26 is omitted and the gate of transistor Q3 is directly grounded through the isolation module 200, the output of the isolation module 200 may experience excessive current due to the rapid charging and discharging of the gate capacitance of transistor Q3. The pull-down effect of the second resistor R29 may be insufficient to stabilize the gate voltage, leading to unstable turn-on and turn-off behavior of transistor Q3. This would make the power supply to the motor 2000 unreliable, and could even damage the isolation module 200 or transistor Q3.

[0044] In some embodiments of this disclosure, the motor drive circuit further includes a filter module 400, which includes a first capacitor C50 and a second capacitor C51 connected in parallel. One end of the filter module 400 is connected to the source of the transistor, and the other end of the filter module 400 is grounded.

[0045] In one example, the first capacitor C50 can have a capacitance of 100nF, a package size of 0603, and a rated voltage of 50V, while the second capacitor C51 can have a capacitance of 10uF, a package size of 0805, and a rated voltage of 50V.

[0046] In the motor drive circuit described above, the filter module 400 effectively filters out noise and transient interference at the power input terminal through the parallel connection of the first capacitor C50 and the second capacitor C51, protecting the switching module and the motor, and improving the circuit's anti-interference capability and service life.

[0047] In some embodiments of this disclosure, the isolation module 200 includes an optocoupler OC2, which includes a light-emitting diode and a phototransistor. The light-emitting diode receives a power control signal and may or may not generate a light signal. The phototransistor conducts when it receives a light signal to turn on the switching module.

[0048] For example, the model of optocoupler OC2 can be EL357N(B)(TA)-G. The two ends of the light-emitting diode can be understood as the input terminals of optocoupler OC2, and the emitter and collector of the phototransistor can be understood as the output terminals of optocoupler OC2.

[0049] In the motor drive circuit described above, the isolation module 200 uses an optocoupler OC2, which realizes the electro-optical-electro-electric conversion of the power control signal through a light-emitting diode and a phototransistor, providing high isolation voltage and fast response capability, and significantly enhancing the circuit's safety and anti-electromagnetic interference capability.

[0050] In some embodiments of this disclosure, the isolation module 200 further includes a third resistor R27, the negative terminal of the light-emitting diode is used to connect to the power control signal through the third resistor R27, the positive terminal of the light-emitting diode is used to connect to the device power supply VDD3.3, the emitter of the phototransistor is grounded, and the collector of the phototransistor is connected to the switching module 100.

[0051] The third resistor R27 can have a resistance of 330Ω and a package size of 0603.

[0052] The device power supply VDD3.3 can be a 3.3V power supply.

[0053] In the motor drive circuit 1000 of the above embodiment, the third resistor R27 in the isolation module 200 limits the current flowing through the light-emitting diode, thereby protecting the optocoupler OC2 from overcurrent damage. At the same time, it optimizes the input stability of the power control signal and further improves the reliability and lifespan of the isolation module 200.

[0054] In some embodiments of this disclosure, the communication module 300 includes an isolation chip U9, a transceiver U10, and a differential circuit 30. The isolation chip U9 is used to receive and isolate motor parameter control signals and send motor parameter control signals to the transceiver U10. The transceiver U10 is used to convert the motor parameter control signals into differential signals and transmit the differential signals to the motor 2000 through the differential circuit 30.

[0055] The isolation chip U9 can be model ADUM1401BRWZ-RL. The isolation chip U9 can receive motor parameter control signals through the VIA and VIB pins, and send the motor parameter control signals to the transceiver U10 through the VOA and VOB pins, thereby achieving electrical isolation between the processor and the transceiver U10. The isolation chip U9 can also receive the actual operating information of the motor 2000 fed back by the transceiver U10 through the VID pin, and send the actual operating information of the motor 2000 to the processor through the VOD pin, so that the processor can understand the actual operating status of the motor 2000.

[0056] The transceiver U10 model can be MAX485ESA+T.

[0057] In the motor drive circuit 1000 described above, the communication module 300, through the combination of isolation chip U9, transceiver U10, and differential circuit 30, realizes isolated transmission and differential signal conversion of motor parameter control signals. Differential signal transmission enhances the anti-interference capability of motor parameter control signals and is suitable for motor 2000 control in long-distance or complex electromagnetic environments.

[0058] In some embodiments of this disclosure, the differential circuit 30 includes a first circuit A and a second circuit B, and the communication module 300 further includes a common-mode inductor L5, which includes a first coil and a second coil. One of the first coil and the second coil is connected in series in the first circuit A, and the other of the first coil and the second coil is connected in series in the second circuit B.

[0059] The common-mode inductor L5 has a common-mode impedance of 2.2kΩ@100MHz, a rated current of 200mA, and a package size of 1206.

[0060] In addition, a fifth resistor R33 can be connected in series in the first circuit A, and a sixth resistor R32 can be connected in series in the second circuit B. The fifth resistor R33 and the sixth resistor R32 can be the same resistor, for example, a resistor with a resistance of 120Ω and a package size of 0603.

[0061] In the motor drive circuit 1000 described above, the common-mode inductor L5 in the differential circuit 30 effectively suppresses common-mode interference through the first coil and the second coil, further improving the stability and reliability of differential signal transmission. It is particularly suitable for motor drive applications in high-noise environments and improves the electromagnetic interference resistance of the differential circuit 30.

[0062] In some embodiments of this disclosure, the differential circuit 30 includes a first circuit A and a second circuit B, and the communication module 300 further includes a dual-channel TVS diode D6, which is connected in parallel between the first circuit A and the second circuit B.

[0063] The dual-channel TVS diode D6 can be model SM712. One anode of the dual-channel TVS diode D6 is connected to the first circuit A, and the other anode of the dual-channel TVS diode D6 is connected to the second circuit B. The common terminal of the dual-channel TVS diode D6 is grounded.

[0064] The dual-channel TVS diode D6 can be connected in parallel in the first circuit A and the second circuit B at a location away from the transceiver U10. Furthermore, the communication module 300 may also include a seventh resistor R31, which is connected in parallel in the first circuit A and the second circuit B near the transceiver U10, thus acting as a terminating matching resistor to prevent waveform distortion or communication errors caused by signal reflection during long-distance transmission. The resistance value of the seventh resistor R31 can be 120Ω, and the package size can be 0603.

[0065] In the motor drive circuit 1000 described above, the dual-channel TVS diode D6 is connected in parallel between the differential circuits 30, which can quickly absorb transient overvoltages, protect the communication module 300 from surge voltage damage, and enhance the robustness and durability of the circuit.

[0066] In some embodiments of this disclosure, the differential circuit 30 includes a first circuit A and a second circuit B, and the communication module 300 further includes a third capacitor C58 and a fourth capacitor C56. One end of the third capacitor C58 is connected to one of the first circuit A and the second circuit B, and the other end of the third capacitor C58 is grounded. One end of the fourth capacitor C56 is connected to the other of the first circuit A and the second circuit B, and the other end of the fourth capacitor C56 is grounded.

[0067] exist Figure 1 In the example, one end of the third capacitor C58 is connected to the first circuit A, and the other end of the third capacitor C58 is grounded; one end of the fourth capacitor C56 is connected to the second circuit B, and the other end of the fourth capacitor C56 is grounded.

[0068] The third capacitor C58 and the fourth capacitor C56 can be the same, for example, they can be capacitors with a capacitance of 1pF and a package size of 0603.

[0069] In addition, the communication module 300 may also include an eighth resistor R34 and a ninth resistor R30. One end of the eighth resistor R34 is connected to the first circuit A, and the other end of the eighth resistor R34 is connected to the power supply of the second device. One end of the ninth resistor R30 is connected to the second circuit B, and the other end of the ninth resistor R30 is grounded. In this way, the eighth resistor R34 acts as a pull-up resistor, and the ninth resistor R30 acts as a pull-down resistor, preventing the transceiver U10 from misjudging the logic state due to voltage drift when the differential circuit 30 is idle. The eighth resistor R34 and the ninth resistor R30 can be the same resistor, for example, resistors with a resistance of 390Ω and a package size of 0603. The power supply of the second device can be a 5.0V power supply, such as VCC5.0.

[0070] In the motor drive circuit 1000 described above, the configuration of the third capacitor C58 and the fourth capacitor C56 further filters out high-frequency noise in the differential circuit 30, optimizes signal quality, reduces the risk of signal distortion, improves the accuracy and stability of motor 2000 control, and enhances the electromagnetic interference resistance of the differential circuit 30.

[0071] In some embodiments of this disclosure, the motor drive circuit 1000 further includes a detection module 500, one end of which is connected to the switch module 100 and the other end of which is connected to the motor 2000. The detection module 500 is used to detect the power status of the motor 2000.

[0072] The power status of the detected motor 2000 includes the power supply voltage and / or supply current.

[0073] The introduction of the detection module 500 in the motor drive circuit 1000 of the above embodiment enables real-time monitoring of the power status of the motor 2000, which can promptly detect abnormal power connection or faults, providing important support for system fault diagnosis and maintenance, and improving the intelligence level and safety of the circuit.

[0074] In some embodiments of this disclosure, the detection module 500 includes a fourth resistor R28 and a current detection circuit 50. The fourth resistor R28 is connected in series between the switch module 100 and the motor 2000. The current detection circuit 50 is connected in parallel with the fourth resistor R28. The current detection circuit 50 is used to detect the current value flowing through the fourth resistor R28 and determine whether the power supply state of the motor 2000 matches the power control signal based on the current value.

[0075] The resistance of the fourth resistor R28 can be 10mΩ.

[0076] The current detection circuit 50 may include a detection chip U11, a tenth resistor R37 and an eleventh resistor R38. The positive input pin (VIN+) of the detection chip U11 is connected to the current input terminal of the fourth resistor R28 through the tenth resistor R37, and the negative input pin (VIN-) of the detection chip U11 is connected to the current output terminal of the fourth resistor R28 through the eleventh resistor R38.

[0077] The tenth resistor R37 and the eleventh resistor R38 can be the same resistor, for example, a resistor with a resistance of 10Ω and a package size of 0603.

[0078] In the motor drive circuit 1000 described above, the detection module 500 monitors the current value through the fourth resistor R28 and the current detection circuit 50, and determines whether the power supply status of the motor 2000 is normal based on the current value. This design can quickly identify the deviation between the power control signal and the actual power supply status, enhancing the system's self-diagnostic capability and operational reliability, and improving the system's safety.

[0079] In some embodiments of this disclosure, the power control signal is generated based on the output signal of the foot switch, and the current detection circuit 50 is used to determine whether the power state of the motor 2000 matches the output signal of the foot switch based on the current value, and to adjust the power control signal if there is a mismatch.

[0080] For example, the foot switch is used to control the power supply of the motor 2000. The output signal of the foot switch can be detected by a pressure sensor or a travel sensor installed on the foot switch. For example, if the pressure sensor or travel sensor detects that the foot switch is pressed, it can be determined that the output signal of the foot switch is high, indicating that the user has a need to start the motor 2000. Then the processor can generate a power control signal indicating that the motor 2000 and the power supply VCC24 are connected. At this time, the current value detected by the current detection circuit 50 should be greater than the current threshold. That is, the current value matching the high level of the foot switch output signal should be greater than the current threshold. If the pressure sensor or travel sensor detects that the foot switch is not pressed, it can be determined that the output signal of the foot switch is low, indicating that the user does not have a need to start the motor 2000. Then the processor can generate a power control signal indicating that the connection between the motor 2000 and the power supply VCC24 is disconnected. At this time, the current value detected by the current detection circuit 50 should be less than or equal to the current threshold. That is, the current value matching the low level of the foot switch output signal should be less than or equal to the current threshold. The current threshold can be 0 or other current values ​​set according to the actual situation.

[0081] Furthermore, if the detection chip detects that the foot switch output signal is low and the current value is greater than the current threshold, that is, the current value does not match the foot switch output signal, it indicates that the power control signal may be incorrect. In this case, the power control signal can be adjusted to represent the disconnection between the motor 2000 and the power supply VCC24. If the detection chip detects that the foot switch output signal is high and the current value is less than or equal to the current threshold, that is, the current value does not match the foot switch output signal, it indicates that the power control signal may be incorrect. In this case, the power control signal can be adjusted to represent the connection between the motor 2000 and the power supply VCC24.

[0082] If the power supply status of the motor 2000 matches the output signal of the foot switch, the power control signal need not be adjusted. In some embodiments, the current detection circuit 50 may also include a speaker. If the power supply status of the motor 2000 does not match the output signal of the foot switch, the detection chip U11 may control the speaker to sound an alarm, thereby alerting the user.

[0083] In the above-described embodiment, the motor drive circuit 1000 and the current detection circuit 50 dynamically adjust the power control signal according to the output signal of the foot switch, ensuring that the power status of the motor 2000 is consistent with the user's operation, thereby improving the safety of the motor 2000 during use and preventing the motor 2000 from running uncontrollably.

[0084] In some embodiments of this disclosure, the motor drive circuit 1000 further includes a bidirectional TVS diode D5, one end of which is connected to the other end of the detection module 500, and the other end of which is grounded.

[0085] The bidirectional TVS diode D5 can be designated as 0603ESDA-24N.

[0086] In the motor drive circuit 1000 described above, the bidirectional TVS diode D5 effectively absorbs transient overvoltage at the motor 2000 terminal, protecting the detection module 500 and the motor 2000 from voltage surge damage, further improving the reliability and safety of the circuit.

[0087] In some embodiments of this disclosure, the motor drive circuit 1000 further includes a fifth capacitor C53 and a sixth capacitor C57, which are connected in parallel with a bidirectional TVS diode D5.

[0088] The fifth capacitor C53 can have a capacitance of 10uF, a package size of 0805, and a rated voltage of 50V. The sixth capacitor C57 can have a capacitance of 100nF, a package size of 0603, and a rated voltage of 50V.

[0089] In the motor drive circuit 1000 described above, the fifth capacitor C53 and the sixth capacitor C57 are connected in parallel with the bidirectional TVS diode D5, which further enhances the circuit's anti-interference capability, optimizes transient response characteristics, and extends the service life of key components.

[0090] In some embodiments of this disclosure, the motor drive circuit 1000 further includes a fuse F2 connected in series between the motor 2000 and the power supply VCC24.

[0091] Fuse F2 has a rated voltage of 125V and a rated current of 5A.

[0092] exist Figure 1 In the example, the power supply is connected to the motor 2000 in sequence through the switch module 100, the detection module 500 and the fuse.

[0093] The motor drive circuit 1000 of the above embodiment has an overcurrent protection function provided by the fuse. When the current is abnormal, it can quickly cut off the connection between the power supply and the motor 2000, effectively preventing the motor 2000 and the circuit from being damaged due to overload or short circuit, thus improving the overall safety of the system.

[0094] It should be noted that the specific values ​​mentioned above are only for illustrating the implementation of this disclosure in detail, and should not be construed as limiting this disclosure. In other examples, implementation methods, or embodiments, other values ​​may be selected based on this disclosure, and no specific limitations are made here.

[0095] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., refer to specific features, structures, or characteristics described in connection with that embodiment / mode or example, which are included in at least one embodiment / mode or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0096] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure 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, and therefore should not be construed as a limitation of this disclosure. 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0097] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this disclosure can be understood according to the specific circumstances.

[0098] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0099] This disclosure provides many different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described herein. Of course, these are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, this disclosure provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0100] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A motor drive circuit, characterized in that, include: A switching module is used to connect the motor and the power supply when the motor is conducting and to disconnect the connection between the motor and the power supply when the motor is off. An isolation module is connected to the switching module. The isolation module includes an optocoupler, which includes a light-emitting diode (LED) and a phototransistor. The LED receives a power control signal and may or may not generate a light signal. The phototransistor conducts when it receives the light signal to turn on the switching module. as well as The communication module includes an isolation chip, a transceiver, and a differential circuit. The isolation chip is used to receive and isolate motor control signals and send the motor control signals to the transceiver. The transceiver is used to convert the motor control signals into differential signals and transmit the differential signals to the motor through the differential circuit.

2. The motor drive circuit according to claim 1, characterized in that, The switching module includes a transistor, a first resistor, and a second resistor. The gate of the transistor is connected to one end of the first resistor, and the other end of the first resistor is grounded through the isolation module. The source of the transistor is connected to the power supply, and the drain of the transistor can be connected 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. The motor drive circuit according to claim 2, characterized in that, The motor drive circuit also includes a filter module, which includes 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. The motor drive circuit according to claim 1, characterized in that, The isolation module also includes a third resistor. The negative terminal of the light-emitting diode is used to connect to the power control signal through the third resistor. The positive terminal of the light-emitting diode is used to connect to the device power supply. The emitter of the phototransistor is grounded. The collector of the phototransistor is connected to the switching module.

5. The motor drive circuit according to claim 1, characterized in that, The differential circuit includes a first circuit and a second circuit. The communication module further includes a common-mode inductor, which includes a first coil and a second coil. One of the first coil and the second coil is connected in series in the first circuit, and the other of the first coil and the second coil is connected in series in the second circuit.

6. The motor drive circuit according to claim 1, characterized in that, The differential circuit includes a first circuit and a second circuit, and the communication module further includes a dual-channel TVS diode connected in parallel between the first circuit and the second circuit.

7. The motor drive circuit according to claim 1, characterized in that, 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, and 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. The motor drive circuit according to claim 1, characterized in that, The motor drive circuit also includes a detection module. 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. The detection module is used to detect the power status of the motor.

9. The motor drive circuit according to claim 8, characterized in that, The detection module includes a fourth resistor and a current detection circuit. The fourth resistor is connected in series between the switch module and the motor. The current detection circuit is connected in parallel with the fourth resistor. The current detection circuit is used to detect the current value flowing through the fourth resistor. Optionally, the motor drive circuit further includes a bidirectional TVS diode, one end of which is connected to the other end of the detection module, and the other end of which is grounded. Optionally, the motor drive circuit further includes a fifth capacitor and a sixth capacitor, which are connected in parallel with the bidirectional TVS diode.

10. The motor drive circuit according to claim 1, characterized in that, The motor drive circuit also includes a fuse, which is connected in series between the motor and the power supply.

Images