Motor driving circuit and power system

Abstract

The invention provides a motor driving circuit and a power system. 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 receives the power supply control signal and generates or does not generate an optical signal, and the optical signal is used for conducting the switch module; and the communication module is connected with the motor and is used for transmitting the received motor parameter control signal to the motor, so that the motor operates according to the motor parameter control signal under the condition that the power supply is switched on.

Description

Technical Field

[0001] The present disclosure relates to a motor drive circuit and a power system. Background Art

[0002] Motor drive circuits are widely used in fields such as industrial control, household appliances, and medical equipment to control the operating state of motors. In the motor drive circuits of related technologies, the motor is always connected to the power supply, and the operating parameters of the motor, such as speed, direction, etc., are directly adjusted through control signals. However, the continuous connection of the motor to the power supply increases the risk of damage to the motor and the circuit under abnormal conditions, and the safety is relatively low. Summary of the Invention

[0003] The present disclosure provides a motor drive circuit and a power system.

[0004] According to one aspect of the present disclosure, there is provided a motor drive circuit, including: a switch module for connecting the motor and the power supply when conducting and disconnecting the connection between the motor and the power supply when turning off; an isolation module connected to the switch module, the isolation module receiving a power supply control signal and generating or not generating an optical signal, the optical signal being used to conduct the switch module; and a communication module connected to the motor, the communication module being configured to transmit a received motor parameter control signal to the motor so that the motor operates according to the motor parameter control signal when the power supply is connected.

[0005] According to the technical solution of one aspect, through the collaborative work of the switch module, the isolation module, and the communication module, reliable connection and disconnection of the motor and the power supply are achieved, as well as effective transmission of the motor parameter control signal, thereby improving safety and reducing energy consumption. At the same time, the isolation module can achieve electrical isolation between the processor side and the switch module side, avoiding voltage spikes, electromagnetic interference, or reverse voltages generated during the operation of the circuit from being transmitted to the processor, resulting in damage to the processor pins or system instability, thereby enhancing the isolation and safety of the circuit. In addition, the communication module ensures that the motor operates precisely according to the motor parameter control signal, improving the stability and control accuracy of the system.

[0006] In the motor drive circuit according to at least one embodiment of the present disclosure, the switch module includes a transistor, a first resistor, and a second resistor. One end of 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, 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 switch module adopts a structure of a transistor combined with a first resistor and a second resistor, which simplifies the circuit design and reduces the cost. The voltage division effect of the first resistor and the second resistor stabilizes the gate voltage of the transistor, ensuring reliable conduction and turn-off of the switch module, and improving the response speed and durability of the circuit.

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

[0009] According to the technical solution of this embodiment, the filtering module effectively filters out the noise and transient interference at the power input end through the first capacitor and the second capacitor connected in parallel, protects the switch module and the motor, and improves the anti-interference ability and service life of the circuit.

[0010] According to the motor drive circuit of at least one embodiment of the present disclosure, the isolation module includes an optocoupler, the optocoupler includes a light-emitting diode and a photosensitive triode, the light-emitting diode receives the power control signal and generates or does not generate the optical signal, and the photosensitive triode conducts to turn on the switch module when receiving the optical signal.

[0011] According to the technical solution of this embodiment, the isolation module adopts an optocoupler to realize the electro-optical-electrical conversion of the power control signal through the light-emitting diode and the photosensitive triode, providing a high isolation voltage and fast response ability, and significantly enhancing the safety and electromagnetic interference resistance of the circuit.

[0012] According to the motor drive circuit of at least one embodiment of the present disclosure, the isolation module further includes a third resistor, the negative electrode of the light-emitting diode is used to access the power control signal through the third resistor, the positive electrode of the light-emitting diode is used to access the device power supply, the emitter of the photosensitive triode is grounded, and the collector of the photosensitive triode is connected to the switch module.

[0013] 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, and at the same time optimizing the input stability of the power control signal, further improving the reliability and life of the isolation module.

[0014] According to the motor drive circuit of at least one embodiment of the present disclosure, the communication module includes an isolation chip, a transceiver, and a differential circuit. The isolation chip is configured to receive and isolate the motor parameter control signal and send the motor parameter control signal to the transceiver. The transceiver is configured to convert the motor parameter control signal into a differential signal and transmit the differential signal to the motor through the differential circuit.

[0015] According to the technical solution of this embodiment, the communication module realizes the isolated transmission of the motor parameter control signal and the differential signal conversion through the combination of the isolation chip, the transceiver, and the differential circuit. The differential signal transmission enhances the anti-interference ability of the motor parameter control signal and is suitable for motor control in long-distance or complex electromagnetic environments.

[0016] According to the motor drive circuit of at least one embodiment of the present disclosure, the differential circuit includes a first circuit and a second circuit. The communication module further includes a common-mode inductor. The common-mode inductor 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.

[0017] According to the technical solution of this embodiment, the common-mode inductor in the differential circuit effectively suppresses the common-mode interference through the first coil and the second coil, further improving the stability and reliability of the differential signal transmission. It is particularly suitable for motor drive applications in high-noise environments and improves the anti-electromagnetic interference ability of the differential circuit.

[0018] According to the motor drive circuit of at least one embodiment of the present disclosure, the differential circuit includes a first circuit and a second circuit. The communication module further includes a dual-channel TVS diode. The dual-channel TVS diode is connected in parallel between the first circuit and the second circuit.

[0019] According to the technical solution of this embodiment, the dual-channel TVS diode is connected in parallel between the differential circuits, which can quickly absorb transient overvoltage, protect the communication module from surge voltage damage, and enhance the robustness and durability of the circuit.

[0020] According to the motor drive circuit of at least one embodiment of the present disclosure, 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.

[0021] According to the technical solution of this embodiment, the setting of the third capacitor and the fourth capacitor further filters out high-frequency noise in the differential circuit, optimizes the 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.

[0022] According to at least one embodiment 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 is configured to detect the power supply state of the motor.

[0023] According to the technical solution of this embodiment, the introduction of the detection module enables real-time monitoring of the power supply state of the motor, can promptly detect abnormal power connections or faults, provides important support for system fault diagnosis and maintenance, and improves the intelligence level and safety of the circuit.

[0024] According to at least one embodiment of the present disclosure, 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, and the current detection circuit is connected in parallel with the fourth resistor. The current detection circuit is configured to detect the current value flowing through the fourth resistor and determine whether the power supply state of the motor matches the power control signal according to the current value.

[0025] According to the technical solution of this embodiment, the detection module monitors the current value through the fourth resistor and the current detection circuit, and determines whether the power supply state of the motor is normal according to the current value. This design can quickly identify the deviation between the power control signal and the actual power supply state, enhances the self-diagnosis ability and operation reliability of the system, and improves the safety of the system.

[0026] According to at least one embodiment of the present disclosure, the power control signal is generated based on the output signal of a foot switch. The current detection circuit is configured to determine whether the power supply state of the motor matches the output signal of the foot switch according to the current value, and adjust the power control signal in case of mismatch.

[0027] According to the technical solution of this embodiment, the current detection circuit dynamically adjusts the power control signal according to the output signal of the foot switch, ensures that the motor power supply state is consistent with the user operation, improves the safety during motor use, and prevents the motor from running uncontrollably.

[0028] According to at least one embodiment of the present disclosure, the motor drive 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.

[0029] According to the technical solution of this embodiment, the setting of the bidirectional TVS diode effectively absorbs the transient overvoltage at the motor end, protects the detection module and the motor from voltage surges, and further improves the reliability and safety of the circuit.

[0030] For the motor drive circuit according to at least one embodiment of the present disclosure, the motor drive 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.

[0031] According to the technical solution of this embodiment, the fifth capacitor and the sixth capacitor are connected in parallel with the bidirectional TVS diode, further enhancing the anti-interference ability of the circuit, optimizing the transient response characteristics, and prolonging the service life of key components.

[0032] For the motor drive circuit according to at least one embodiment of the present disclosure, the motor drive circuit further includes a fuse, and the fuse is connected in series between the motor and the power supply.

[0033] According to the technical solution of this embodiment, the setting of the fuse provides an overcurrent protection function, quickly cuts off the connection between the power supply and the motor when the current is abnormal, effectively prevents the motor and the circuit from being damaged due to overload or short circuit, and improves the overall safety of the system.

[0034] According to another aspect of the present disclosure, a power system is provided, which is applied to an endoscope, and the power system includes the motor drive circuit according to any one of the above embodiments.

[0035] According to the technical solution of another aspect, through the collaborative work of the switch module, the isolation module and the communication module, the reliable connection and disconnection of the motor and the power supply, and the effective transmission of the motor parameter control signal are realized, thereby improving the safety of the power system and reducing energy consumption. At the same time, the isolation module can achieve electrical isolation between the processor side and the switch module side, avoiding voltage spikes, electromagnetic interference or reverse voltage generated during the operation of the circuit from being transmitted to the processor, resulting in damage to the processor pins or system instability, thereby enhancing the isolation and safety of the circuit. In addition, the communication module ensures that the motor operates precisely according to the motor parameter control signal, improving the stability and control accuracy of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, are used to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure, and the drawings are included in this specification and form a part of this specification.

[0037] Figure 1 is a schematic structural diagram of a motor drive circuit according to an embodiment of the present disclosure. Detailed Implementation Modes

[0038] The following further elaborates on the present disclosure in conjunction with the accompanying drawings and examples. It can be understood that the specific examples described herein are only for explaining the relevant content and do not limit the present disclosure. Additionally, it should be noted that for ease of description, only the parts related to the present disclosure are shown in the drawings.

[0039] It should be noted that, without conflict, the implementation modes and features in the implementation modes of the present disclosure can be combined with each other. The following will elaborate on the technical solution of the present disclosure in detail with reference to the accompanying drawings and implementation modes.

[0040] The motor being always connected to the power supply increases the risk of damage to the motor and the circuit under abnormal conditions (such as power surges or short circuits), resulting in relatively low safety. Moreover, the continuous connection of the motor to the power supply may cause unnecessary energy consumption, especially when the motor is in a long-term standby state.

[0041] To this end, the present disclosure proposes the following technical solution. In this technical solution, the isolation module controls the switch module to achieve the connection and disconnection of the power supply and the motor, and the communication module is used to transmit the motor parameter control signal, so that the power control of the motor and the motor parameter control are independent of each other, and the motor does not have to be always connected to the power supply, thereby improving safety and reducing energy consumption.

[0042] The motor drive circuit of the present disclosure can be used for driving motors of devices such as peristaltic pumps and shaving handles in medical equipment, thereby improving the safety during the use of medical equipment.

[0043] Figure 1 The circuit schematic diagram of the motor drive circuit according to an implementation mode of the present disclosure is shown. As Figure 1 shown, the motor drive circuit 1000 includes: a switch module 100, which is used to connect the motor 2000 and the power supply VCC24 when conducting, and disconnect the connection between the motor 2000 and the power supply VCC24 when turning off; an isolation module 200, connected to the switch module 100, the isolation module 200 receives the power control signal and generates or does not generate an optical signal, and the optical signal is used to conduct the switch module 100; and a communication module 300, connected to the motor 2000, the communication module 300 is used to transmit the received motor parameter control signal to the motor 2000, so that the motor 2000 operates according to the motor parameter control signal when the power supply is connected.

[0044] The power supply VCC24 can be a 24V power supply.

[0045] The power control signal can indicate whether the motor 2000 and the power supply VCC24 are connected. For example, when the power control signal is at a low level, it indicates that the motor 2000 and the power supply VCC24 are connected; when the power control signal is at a high level, it indicates that the connection between the motor 2000 and the power supply VCC24 is disconnected. Alternatively, when the power control signal is at a high level, it indicates that the motor 2000 and the power supply VCC24 are connected; when the power control signal is at a low level, it indicates that the connection between the motor 2000 and the power supply VCC24 is disconnected. The high level can be a level with a voltage greater than the first voltage threshold, and the low level can be a level with a voltage less than the second voltage threshold. The first voltage threshold is greater than the second voltage threshold, and the first voltage threshold and the second voltage threshold can be set according to the actual situation.

[0046] The motor parameter control signal can indicate the operating parameters of the motor 2000, such as the rotational speed, the direction of rotation, etc.

[0047] The power control signal and the motor parameter control signal can be generated by a processor (not shown in the figure) respectively, and output by the processor to the isolation module 200 or the communication module 300. The processor can be integrated in the motor drive circuit 1000 or can be set independently of the motor drive circuit 1000, which is not limited herein. The processor can be a Central Processing Unit (CPU), or can also be 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 the processor can also be any conventional processor, etc.

[0048] In the motor drive circuit 1000 according to the embodiments of the present disclosure, through the collaborative work of the switch module 100, the isolation module 200 and the communication module 300, reliable connection and disconnection between the motor 2000 and the power supply are achieved, as well as effective transmission of the motor parameter control signal, thereby improving safety and reducing energy consumption. At the same time, the isolation module 200 can achieve electrical isolation between the processor side and the switch module 100 side, avoiding voltage spikes, electromagnetic interference or reverse voltage generated during the operation of the circuit from being transmitted to the processor, resulting in damage to the processor pins or system instability, thereby enhancing the isolation and safety of the circuit. In addition, the communication module 300 ensures that the motor 2000 operates precisely according to the motor parameter control signal, improving the stability and control accuracy of the system.

[0049] In some embodiments of the present disclosure, the switch module 100 includes a transistor Q3, a first resistor R26, and a second resistor R29. One end of the gate of the transistor Q3 is connected to one end of the first resistor R26, 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, 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.

[0050] In one example, the transistor Q3 is a P-polarity MOS transistor, and the model can be AO4485. The resistance value of the first resistor R26 can be 10 kΩ, the package size can be 0603, the resistance value of the second resistor R29 can be 10 kΩ, and the package size can be 0603.

[0051] For the motor drive circuit 1000 in the above embodiment, the switch module 100 adopts a structure of combining the transistor Q3 with the first resistor R26 and the second resistor R29, which simplifies the circuit design and reduces the cost. The voltage dividing effect of the first resistor R26 and the second resistor R29 stabilizes the gate voltage of the transistor Q3, ensures reliable conduction and turn-off of the switch module 100, and improves the response speed and durability of the circuit. It can be understood that if the first resistor R26 is omitted and the gate of the transistor Q3 is directly grounded through the isolation module 200, the output end of the isolation module 200 may bear excessive current due to the rapid charge and discharge of the gate capacitance of the transistor Q3, and the pulling-down effect of the second resistor R29 may not be sufficient to stabilize the gate voltage, resulting in unstable conduction and turn-off behaviors of the transistor Q3, and further making the connection and disconnection of the power supply of the motor 2000 unreliable, and even may damage the isolation module 200 or the transistor Q3.

[0052] In some embodiments of the present disclosure, the motor drive circuit further includes a filtering module 400. The filtering module 400 includes a first capacitor C50 and a second capacitor C51 connected in parallel. One end of the filtering module 400 is connected to the source of the transistor, and the other end of the filtering module 400 is grounded.

[0053] In one example, the capacitance value of the first capacitor C50 can be 100 nF, the package size can be 0603, and the rated voltage can be 50 V. The capacitance value of the second capacitor C51 can be 10 μF, the package size can be 0805, and the rated voltage can be 50 V.

[0054] For the motor drive circuit in the above embodiment, the filtering module 400 effectively filters out the noise and transient interference at the power input end through the first capacitor C50 and the second capacitor C51 connected in parallel, protects the switch module and the motor, and improves the anti-interference ability and service life of the circuit.

[0055] In some embodiments of the present disclosure, the isolation module 200 includes an optocoupler OC2. The optocoupler OC2 includes a light-emitting diode and a phototransistor. The light-emitting diode receives a power control signal and generates or does not generate an optical signal. The phototransistor conducts to turn on the switch module when receiving the optical signal.

[0056] Exemplarily, the model of the optocoupler OC2 can be EL357N(B)(TA)-G. The two ends of the light-emitting diode can be understood as the input end of the optocoupler OC2, and the emitter and collector of the phototransistor can be understood as the output end of the optocoupler OC2.

[0057] For the motor drive circuit in the above embodiment, the isolation module 200 uses the optocoupler OC2 to realize the electro-optical-electro conversion of the power control signal through the light-emitting diode and the phototransistor, providing a high isolation voltage and fast response ability, and significantly enhancing the safety and electromagnetic interference resistance of the circuit.

[0058] In some embodiments of the present disclosure, the isolation module 200 further includes a third resistor R27. The negative pole of the light-emitting diode is used to access the power control signal through the third resistor R27, the positive pole of the light-emitting diode is used to access the device power supply VDD3.3, the emitter of the phototransistor is grounded, and the collector of the phototransistor is connected to the switch module 100.

[0059] The resistance value of the third resistor R27 can be 330Ω, and the package size can be 0603.

[0060] The device power supply VDD3.3 can be a 3.3V power supply.

[0061] For the motor drive circuit 1000 in 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, and at the same time optimizing the input stability of the power control signal, further improving the reliability and lifespan of the isolation module 200.

[0062] In some embodiments of the present 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 the motor parameter control signal and send the motor parameter control signal to the transceiver U10. The transceiver U10 is used to convert the motor parameter control signal into a differential signal and transmit the differential signal to the motor 2000 through the differential circuit 30.

[0063] The model of the isolation chip U9 can be ADUM1401BRWZ-RL. The isolation chip U9 can receive the motor parameter control signal through the VIA and VIB pins, and send the motor parameter control signal to the transceiver U10 through the VOA and VOB pins, so as to achieve electrical isolation between the processor and the transceiver U10; the isolation chip U9 can also receive the actual operation information of the motor 2000 fed back by the transceiver U10 through the VID pin, and send the actual operation information of the motor 2000 to the processor through the VOD pin, so as to facilitate the processor to understand the actual operation of the motor 2000.

[0064] The model of the transceiver U10 can be MAX485ESA+T.

[0065] In the motor drive circuit 1000 of the above embodiment, the communication module 300 realizes the isolated transmission and differential signal conversion of the motor parameter control signal through the combination of the isolation chip U9, the transceiver U10 and the differential circuit 30. The differential signal transmission enhances the anti-interference ability of the motor parameter control signal and is suitable for the control of the motor 2000 under long-distance or complex electromagnetic environments.

[0066] In some embodiments of the present disclosure, the differential circuit 30 includes a first circuit A and a second circuit B. The communication module 300 further includes a common-mode inductor L5. The common-mode inductor L5 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.

[0067] The common-mode impedance of the common-mode inductor L5 can be 2.2 kΩ@100 MHz, the rated current can be 200 mA, and the package size can be 1206.

[0068] 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, they are resistors with a resistance value of 120 Ω and a package size of 0603.

[0069] In the motor drive circuit 1000 of the above embodiment, the common-mode inductor L5 in the differential circuit 30 effectively suppresses the common-mode interference through the first coil and the second coil, further improving the stability and reliability of the differential signal transmission. It is especially suitable for motor drive applications in high-noise environments and improves the anti-electromagnetic interference ability of the differential circuit 30.

[0070] In some embodiments of the present disclosure, the differential circuit 30 includes a first circuit A and a second circuit B. The communication module 300 further includes a dual-channel TVS diode D6. The dual-channel TVS diode D6 is connected in parallel between the first circuit A and the second circuit B.

[0071] The model of the dual-channel TVS diode D6 can be 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.

[0072] The dual-channel TVS diode D6 can be connected in parallel at a position far from the transceiver U10 in the first circuit A and the second circuit B. In addition, the communication module 300 may further include a seventh resistor R31. The seventh resistor R31 is connected in parallel at a position close to the transceiver U10 in the first circuit A and the second circuit B, so as to act as a termination 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.

[0073] In the motor drive circuit 1000 of the above embodiment, the dual-channel TVS diode D6 is connected in parallel between the differential circuits 30, which can quickly absorb transient overvoltage, protect the communication module 300 from surge voltage damage, and enhance the robustness and durability of the circuit.

[0074] In some embodiments of the present disclosure, the differential circuit 30 includes a first circuit A and a second circuit B. 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.

[0075] In Figure 1 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.

[0076] The third capacitor C58 and the fourth capacitor C56 can be the same. For example, they are capacitors with a capacitance value of 1pF and a package size of 0603 respectively.

[0077] In addition, the communication module 300 may further 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 second device power supply. 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 serves as a pull-up resistor and the ninth resistor R30 serves as a pull-down resistor, avoiding misjudgment of the logic state of the transceiver U10 due to voltage drift when the differential circuit 30 is idle. The eighth resistor R34 and the ninth resistor R30 may be the same resistor. For example, they are respectively resistors with a resistance value of 390 Ω and a package size of 0603. The second device power supply may be a 5.0V power supply, such as VCC5.0.

[0078] In the motor drive circuit 1000 of the above embodiment, the setting of the third capacitor C58 and the fourth capacitor C56 further filters out the high-frequency noise in the differential circuit 30, optimizes the signal quality, reduces the risk of signal distortion, improves the accuracy and stability of the control of the motor 2000, and improves the electromagnetic interference resistance of the differential circuit 30.

[0079] In some embodiments of the present disclosure, the motor drive circuit 1000 further includes a detection module 500. One end of the detection module 500 is connected to the switch module 100, and the other end of the detection module 500 is connected to the motor 2000. The detection module 500 is used to detect the power supply state of the motor 2000.

[0080] The detected power supply state of the motor 2000 includes the power supply voltage and / or the supply current.

[0081] In the motor drive circuit 1000 of the above embodiment, the introduction of the detection module 500 realizes the real-time monitoring of the power supply state of the motor 2000, can timely detect abnormal power connections or faults, provides important support for the fault diagnosis and maintenance of the system, and improves the intelligent level and safety of the circuit.

[0082] In some embodiments of the present 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, and 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 according to the current value.

[0083] The resistance value of the fourth resistor R28 may be 10 mΩ.

[0084] 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 end 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 end of the fourth resistor R28 through the eleventh resistor R38.

[0085] The tenth resistor R37 and the eleventh resistor R38 may be the same resistor. For example, they may be resistors with a resistance value of 10 Ω and a package size of 0603, respectively.

[0086] In the motor drive circuit 1000 of the above embodiment, 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 state of the motor 2000 is normal according to the current value. This design can quickly identify the deviation between the power control signal and the actual power supply state, enhance the self-diagnosis ability and operation reliability of the system, and improve the safety of the system.

[0087] In some embodiments of the present disclosure, the power control signal is generated according to the output signal of the foot switch. The current detection circuit 50 is used to determine whether the power supply state of the motor 2000 matches the output signal of the foot switch according to the current value, and adjust the power control signal in case of mismatch.

[0088] Exemplarily, 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 provided on the foot switch. For example, if the pressure sensor or the travel sensor detects that the foot switch is pressed, it can be determined that the output signal of the foot switch is high level, indicating that the user has a demand to start the motor 2000. Then, the processor can generate a power control signal indicating to connect the motor 2000 and the power supply VCC24. At this time, the current value detected by the current detection circuit 50 should be greater than the current threshold. That is to say, the current value matching the high-level output signal of the foot switch should be greater than the current threshold. If the pressure sensor or the travel sensor detects that the foot switch is not pressed, it can be determined that the output signal of the foot switch is low level, indicating that the user has no demand to start the motor 2000. Then, the processor can generate a power control signal indicating to disconnect the connection between the motor 2000 and the power supply VCC24. 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 to say, the current value matching the low-level output signal of the foot switch 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.

[0089] Further, if the detection chip detects that the output signal of the foot switch is at a low level while the current value is greater than the current threshold, that is, the current value does not match the output signal of the foot switch at this time, it indicates that the power control signal may be incorrect. Furthermore, the power control signal can be adjusted to a power control signal representing the disconnection of the connection between the motor 2000 and the power supply VCC24; if the detection chip detects that the output signal of the foot switch is at a high level while the current value is less than or equal to the current threshold, that is, the current value does not match the output signal of the foot switch at this time, it indicates that the power control signal may be incorrect. Furthermore, the power control signal can be adjusted to a power control signal representing the connection of the motor 2000 and the power supply VCC24.

[0090] When the power state of the motor 2000 matches the output signal of the foot switch, the power control signal may not be adjusted. In some embodiments, the current detection circuit 50 may further include a speaker. When the power state of the motor 2000 does not match the output signal of the foot switch, the detection chip U11 may also control the speaker to give an alarm to remind the user to pay attention.

[0091] For the motor drive circuit 1000 of the above embodiments, the current detection circuit 50 dynamically adjusts the power control signal according to the output signal of the foot switch, ensuring that the power state of the motor 2000 is consistent with the user operation, improving the safety during the use of the motor 2000, and preventing the motor 2000 from running uncontrollably.

[0092] In some embodiments of the present disclosure, the motor drive circuit 1000 further includes a bidirectional TVS diode D5. One end of the bidirectional TVS diode D5 is connected to the other end of the detection module 500, and the other end of the bidirectional TVS diode D5 is grounded.

[0093] The model of the bidirectional TVS diode D5 can be 0603ESDA-24N.

[0094] For the motor drive circuit 1000 of the above embodiments, the setting of the bidirectional TVS diode D5 effectively absorbs the transient overvoltage at the motor 2000 end, protecting the detection module 500 and the motor 2000 from damage caused by voltage surges, and further improving the reliability and safety of the circuit.

[0095] In some embodiments of the present disclosure, the motor drive circuit 1000 further includes a fifth capacitor C53 and a sixth capacitor C57. The fifth capacitor C53 and the sixth capacitor C57 are respectively connected in parallel with the bidirectional TVS diode D5.

[0096] The capacitance value of the fifth capacitor C53 can be 10 uF, the package size can be 0805, and the rated voltage can be 50V. The capacitance value of the sixth capacitor C57 can be 100 nF, the package size can be 0603, and the rated voltage can be 50V.

[0097] For the motor drive circuit 1000 of the above-described embodiment, the fifth capacitor C53 and the sixth capacitor C57 are connected in parallel with the bidirectional TVS diode D5, further enhancing the anti-interference ability of the circuit, optimizing the transient response characteristics, and extending the service life of key components.

[0098] In some embodiments of the present disclosure, the motor drive circuit 1000 further includes a fuse F2, and the fuse F2 is connected in series between the motor 2000 and the power supply VCC24.

[0099] The rated voltage of the fuse F2 can be 125V and the rated current can be 5A.

[0100] In Figure 1 the example of, the power supply is connected to the motor 2000 through the switch module 100, the detection module 500, and the fuse in sequence.

[0101] For the motor drive circuit 1000 of the above-described embodiment, the setting of the fuse provides an overcurrent protection function, which can quickly cut off the connection between the power supply and the motor 2000 when the current is abnormal, effectively preventing the motor 2000 and the circuit from being damaged due to overload or short circuit, and improving the overall safety of the system.

[0102] The present disclosure also provides a power system, which can be applied to an endoscope. The power system includes the motor drive circuit of any of the above embodiments.

[0103] Exemplarily, the power system can be the power system of the peristaltic pump stepping motor of the endoscope, or the power system of other motors of the endoscope, or the power system of the motor of the cutting device used in cooperation with the endoscope, etc.

[0104] In the power system of the embodiment of the present disclosure, through the coordinated operation of the switch module, the isolation module, and the communication module, reliable connection and disconnection of the motor and the power supply are achieved, as well as effective transmission of the motor parameter control signal, thereby improving the safety of the power system and reducing energy consumption. At the same time, the isolation module can achieve electrical isolation between the processor side and the switch module side, avoiding voltage spikes, electromagnetic interference, or reverse voltage generated during the operation of the circuit from being transmitted to the processor, resulting in damage to the processor pins or system instability, thereby enhancing the isolation and safety of the circuit. In addition, the communication module ensures that the motor operates precisely according to the motor parameter control signal, improving the stability and control accuracy of the power system.

[0105] It should be noted that the specific values mentioned above are only for detailed illustration of the embodiments of the present disclosure as examples, and should not be construed as a limitation to the present disclosure. In other examples, embodiments, or embodiments, other values can be selected according to the present disclosure, and no specific limitation is made here.

[0106] In the description of this specification, the description with reference to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, or characteristics described in connection with that embodiment / way or example are included in at least one embodiment / way or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0107] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specifically defined.

[0108] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0109] In this disclosure, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include contact between the first and second features not directly but through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and diagonally below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0110] The present disclosure provides many different embodiments or examples for implementing different structures of the present disclosure. To simplify the disclosure of the present disclosure, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0111] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present disclosure and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or variations can be made on the basis of the above disclosure, and these changes or variations are still within the scope of the present disclosure.

Claims

1. A motor drive circuit, characterized in that, Comprising: A switch module for connecting the motor and the power supply when turned on and disconnecting the connection between the motor and the power supply when turned off; An isolation module connected to the switch module, the isolation module receiving a power control signal and generating or not generating an optical signal for turning on the switch module; And A communication module connected to the motor, the communication module for transmitting a received motor parameter control signal to the motor so that the motor operates according to the motor parameter control signal when the power supply is turned on.

2. The motor drive circuit according to claim 1, wherein, The switch 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, 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 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 is connected to the source, and the other end of the filtering module is grounded.

4. The motor drive circuit according to claim 1, characterized in that The isolation module includes an optocoupler, the optocoupler including a light-emitting diode and a phototransistor. The light-emitting diode receives the power control signal and generates or does not generate the optical signal, and the phototransistor conducts to turn on the switch module when receiving the optical signal.

5. The motor drive circuit according to claim 4, wherein The isolation module further includes a third resistor. The negative electrode of the light-emitting diode is used to access the power control signal through the third resistor, the positive electrode of the light-emitting diode is used to access the device power supply, the emitter of the phototransistor is grounded, and the collector of the phototransistor is connected to the switch module.

6. The motor drive circuit according to claim 1, characterized in that, The communication module includes an isolation chip, a transceiver, and a differential circuit. The isolation chip is used to receive and isolate the motor parameter control signal and send the motor parameter control signal to the transceiver. The transceiver is used to convert the motor parameter control signal into a differential signal and transmit the differential signal to the motor through the differential circuit.

7. The motor drive circuit according to claim 6, wherein The differential circuit includes a first circuit and a second circuit. 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 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; Optionally, the differential circuit includes a first circuit and a second circuit. The communication module further includes a dual-channel TVS diode connected in parallel between the first circuit and the second circuit; Optionally, 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. The motor drive circuit according to claim 1, wherein 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 is used to detect the power supply state of the motor; Optionally, 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, 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 and determine whether the power supply state of the motor matches the power supply control signal according to the current value; Optionally, the power supply control signal is generated according to the output signal of a foot switch. The current detection circuit is used to determine whether the power supply state of the motor matches the output signal of the foot switch according to the current value, and adjust the power supply control signal in case of mismatch; Optionally, the motor drive 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 drive circuit further includes a fifth capacitor and a sixth capacitor. The fifth capacitor and the sixth capacitor are respectively connected in parallel with the bidirectional TVS diode.

9. The motor drive circuit according to claim 1, wherein The motor drive circuit further includes a fuse. The fuse is connected in series between the motor and the power supply.

10. A power system, applied to an endoscope, characterized in that The power system includes the motor drive circuit according to any one of claims 1 to 9.

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