Driving control system of motor

Abstract

The embodiment of the utility model discloses a driving control system of a motor. The driving control system comprises a motor, a driving module, a motor anti-reverse-dragging module and a microcontroller, the motor anti-reverse dragging module comprises a depletion type switch unit, and the depletion type switch unit comprises a first connecting end, a second connecting end and a first control end; the motor and driving module comprises a brush motor, the brush motor comprises a first end and a second end, the first end is electrically connected with the first connecting end, and the second end is electrically connected with the second connecting end; or, the motor and driving module comprises a brushless driving circuit, the brushless driving circuit comprises a third end and a fourth end, the third end is electrically connected with the first connecting end, and the fourth end is electrically connected with the second connecting end; the microcontroller is used for controlling connection or disconnection of the first connecting end and the second connecting end, and then short circuit or short circuit removal of the motor is achieved. The driving control system has high anti-reverse dragging capability, the active protection effect of combining software and hardware of the circuit is achieved, and the reliability of the driving control system is improved.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of motor drive, and in particular to a drive control system for a motor. Background Art

[0002] With the rapid development of the motor industry, components that can be driven by motors have been widely used in daily life.

[0003] However, when the motor is in standby or powered off and stationary, there are some components driven by the motor that will cause their corresponding drive motors to rotate forcibly when subjected to external force, generating electricity. Exemplarily, these components driven by the motor include mobile robots with a driving wheel driven by a brushed or brushless motor, light electric vehicles (such as electric wheelchairs, etc.) that are easily pushed by external force, products with a brushless electric fan that will be forced to rotate by strong external wind (such as the outdoor unit of an air conditioner, etc.). When these components driven by the motor are pushed by external force, their corresponding drive motors will be forced to rotate and generate electricity. Since the generated voltage is proportional to the speed of the forced rotation, sometimes the external force is very large, resulting in a very fast speed of the forced rotation, then the generated voltage will be very high, and this generated voltage will also be coupled into the pre-stage drive control circuit or power circuit. This high-voltage coupling damage is irregular, thus causing a risk of random circuit damage. The damage can be an immediate permanent damage, or it can be that the device withstand voltage limit is exceeded instantaneously, resulting in a risk of subsequent progressive damage.

[0004] Currently, the general protection method for circuit damage caused by the coupling of the generated voltage is to add passive protection devices (such as TVS, varistors, electrolytic capacitors, etc.) to shunt and discharge the generated voltage generated by the forced rotation of the drive motor in parallel. However, these measures are all passive protections, and the protection power is also limited. They cannot cope with the transient surge high generated energy brought by violent external force rotation. After experiencing multiple protections, the lifespan of the passive protection devices also decreases rapidly, and high-reliability circuit protection cannot be achieved. In addition, the protection method for circuit damage caused by the coupling of the generated voltage also uses software control, that is, the microcontroller issues different level signals to the drive circuit of the motor to prevent the components driven by the motor from generating electricity when forced to rotate by external force when the motor is in standby or powered off. However, software control cannot prevent protection at the moment when the whole machine is completely powered off. In the case of power-off, the microcontroller cannot issue any control signals, and the drive circuit of the motor cannot execute any control signals. Summary of the Utility Model

[0005] An embodiment of the present utility model provides a driving control system for a motor, which has a high anti-dragging ability, realizes the active protection effect of the circuit, reduces the voltage withstand requirements and selection requirements of components in the driving control system, and increases the overall reliability of the driving control system.

[0006] An embodiment of the present utility model provides a driving control system for a motor, including a motor, a driving module, a motor anti-dragging module, and a microcontroller;

[0007] The motor anti-dragging module includes a depletion-type switch unit. The depletion-type switch unit includes a first connection end, a second connection end, and a first control end. The microcontroller includes a system protection signal output end, and the first control end is electrically connected to the system protection signal output end;

[0008] The motor and the driving module include a brushed driving circuit and a brushed motor which are electrically connected. The brushed motor includes a first end and a second end. The first end is electrically connected to the first connection end, and the second end is electrically connected to the second connection end;

[0009] Alternatively, the motor and the driving module include a brushless driving circuit and a brushless motor which are electrically connected. The brushless driving circuit includes a third end and a fourth end. The third end is electrically connected to the first connection end, and the fourth end is electrically connected to the second connection end.

[0010] An embodiment of the present utility model provides a driving control system for a motor. The driving control system includes a motor, a driving module, a motor anti-backdriving module, and a microcontroller. The motor anti-backdriving module includes a depletion-type switching unit. The depletion-type switching unit includes a first connection end, a second connection end, and a first control end. The microcontroller includes a system protection signal output end, and the first control end is electrically connected to the system protection signal output end. The motor and the driving module include a brushed driving circuit and a brushed motor that are electrically connected. The brushed driving circuit is used to drive the brushed motor to operate. The brushed motor includes a first end and a second end. The first end is electrically connected to the first connection end, and the second end is electrically connected to the second connection end. The microcontroller is used to control the conduction or disconnection of the first connection end and the second connection end, thereby short-circuiting or releasing the short circuit of the brushed motor. Alternatively, the motor and the driving module include a brushless driving circuit and a brushless motor that are electrically connected. The brushless driving circuit is used to drive the brushless motor to operate. The brushless driving circuit includes a third end and a fourth end. The third end is electrically connected to the first connection end, and the fourth end is electrically connected to the second connection end. The microcontroller is used to control the conduction or disconnection of the first connection end and the second connection end, thereby short-circuiting or releasing the short circuit of the brushless driving circuit. The driving control system utilizes the electrical connection relationship between the depletion-type switching unit and the brushed motor or the brushless driving circuit. When the motor is standby or powered off and stationary, the depletion-type switching unit is in a conducting state, short-circuiting the corresponding brushed motor or the brushless driving circuit to form a discharging circuit, so that the generated voltage when the standby or powered-off and stationary motor is dragged is consumed through this discharging circuit, without affecting other components in the driving control system, preventing the risk of circuit damage caused by the forced rotation of the corresponding driving motor due to external force pushing to generate electricity, enabling the driving control system to have a high anti-backdriving ability, achieving the effect of active protection combining software and hardware of the circuit, reducing the voltage withstand requirements and component selection requirements of the components in the driving control system, and increasing the overall reliability and safety of the driving control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of a driving control system for a motor provided by an embodiment of the present utility model;

[0012] Figure 2 is a schematic structural diagram of another driving control system for a motor provided by an embodiment of the present utility model;

[0013] Figure 3 is an enlarged schematic structural diagram of a brushless motor and a brushless driving circuit provided by an embodiment of the present utility model;

[0014] Figure 4 is Figure 3 a schematic diagram of the current flow direction of the voltage clamping of the brushless motor shown; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0016] Figure 1 is a schematic structural diagram of a driving control system of an electric motor provided by an embodiment of the present utility model. As Figure 1 shown, in a specific embodiment, the driving control system of the electric motor includes an electric motor, a driving module 10, an anti-backdriving module 20 of the electric motor, and a microcontroller; the anti-backdriving module 20 of the electric motor includes a depletion-type switch unit 21, the depletion-type switch unit 21 includes a first connection end, a second connection end, and a first control end, the microcontroller includes a system protection signal output end 31, and the first control end is electrically connected to the system protection signal output end 31; the electric motor and the driving module 10 include a brushed driving circuit 11 and a brushed electric motor 12 that are electrically connected, the brushed driving circuit 11 is used to drive the brushed electric motor 12 to work, the brushed electric motor 12 includes a first end and a second end, the first end is electrically connected to the first connection end, and the second end is electrically connected to the second connection end; the microcontroller is used to control the conduction or disconnection of the first connection end and the second connection end, so as to short-circuit or remove the short-circuit of the brushed electric motor 12.

[0017] Or, Figure 2 is a schematic structural diagram of another driving control system of an electric motor provided by an embodiment of the present utility model. As Figure 2 shown, in another specific embodiment, the driving control system of the electric motor includes an electric motor, a driving module 10, an anti-backdriving module 20 of the electric motor, and a microcontroller; the anti-backdriving module 20 of the electric motor includes a depletion-type switch unit 21, the depletion-type switch unit 21 includes a first connection end, a second connection end, and a first control end, the microcontroller includes a system protection signal output end 31, and the first control end is electrically connected to the system protection signal output end 31; the electric motor and the driving module 10 include a brushless driving circuit 13 and a brushless electric motor 14 that are electrically connected, the brushless driving circuit 13 is used to drive the brushless electric motor 14 to work, the brushless driving circuit 13 includes a third end and a fourth end, the third end is electrically connected to the first connection end, and the fourth end is electrically connected to the second connection end; the microcontroller is used to control the conduction or disconnection of the first connection end and the second connection end, so as to short-circuit or remove the short-circuit of the brushless driving circuit 13.

[0018] Specifically, the drive control system of the motor includes the motor, a drive module 10, an anti-backdriving module 20 of the motor, and a microcontroller. Among them, the anti-backdriving module 20 of the motor includes a depletion-mode switching unit 21. The depletion-mode switching unit 21 includes a first connection end, a second connection end, and a first control end. The microcontroller includes a system protection signal output end 31. The first control end is electrically connected to the system protection signal output end 31. Exemplarily, the depletion-mode switching unit 21 may refer to a switching device that is in a conducting state when no control signal is applied to the first control end, or the depletion-mode switching unit 21 may also refer to a switching device that is in a conducting state or a non-conducting state correspondingly when receiving a control signal sent from the system protection signal output end 31.

[0019] Figure 1The shown motor and drive module 10 includes a brushed drive circuit 11 and a brushed motor 12 which are electrically connected. The brushed drive circuit 11 can drive the brushed motor 12 to work. Exemplarily, the brushed drive circuit 11 can be an H-bridge drive chip, an H-bridge circuit built by discrete components, a unidirectional drive circuit composed of a single field effect transistor, etc. Among them, the brushed motor 12 includes a first end and a second end, and the first end of the brushed motor 12 is electrically connected to the first connection end of the depletion-mode switch unit 21, and the second end of the brushed motor 12 is electrically connected to the second connection end of the depletion-mode switch unit 21. It can be understood that the brushed motor 12 and the depletion-mode switch unit 21 form a parallel structure. And, exemplarily, the first connection end of the depletion-mode switch unit 21 can be electrically connected to any one of the first end and the second end of the brushed motor 12, and the second connection end of the depletion-mode switch unit 21 is electrically connected to the other one of the first end and the second end of the brushed motor 12, without distinguishing the polarity direction of the brushed motor 12. Thus, the use of the depletion-mode switch unit 21 provides protection for the brushed motor 12 with a relatively high anti-backdriving ability, mainly including the following three situations: 1) When the entire machine of the drive control system of the motor is powered off, the first control end of the depletion-mode switch unit 21 cannot access the control signal, then the depletion-mode switch unit 21 is in the on state, that is, the first connection end and the second connection end of the depletion-mode switch unit 21 are conducting, making the first end and the second end of the brushed motor 12 connected, and the brushed motor 12 is short-circuited. At this time, the brushed motor 12 cannot be forced to rotate by an external force to generate electricity. 2) When the brushed motor 12 is in standby or sleep state (at this time the brushed motor 12 is powered on), the first control end of the depletion-mode switch unit 21 can access the effective control signal sent by the system protection signal output end 31, then the depletion-mode switch unit 21 is in the on state, that is, the first connection end and the second connection end of the depletion-mode switch unit 21 are conducting, making the first end and the second end of the brushed motor 12 connected, and the brushed motor 12 is short-circuited. At this time, the brushed motor 12 cannot be forced to rotate by an external force to generate electricity. 3) When the brushed motor 12 needs to work and rotate normally (at this time the brushed motor 12 is powered on), the first control end of the depletion-mode switch unit 21 can access the invalid control signal sent by the system protection signal output end 31, then the depletion-mode switch unit 21 is in the off state, that is, the first connection end and the second connection end of the depletion-mode switch unit 21 are disconnected, making the first end and the second end of the brushed motor 12 not connected, and the brushed motor 12 is released from short circuit. At this time, the brushed motor 12 can work and rotate normally under the drive of the brushed drive circuit 11.That is, the microcontroller can send a corresponding control signal or not send a control signal through the system protection signal output terminal 31 to control the conduction or disconnection of the first connection end and the second connection end of the depletion-type switching unit 21, thereby short-circuiting or removing the short circuit of the brushed motor 12, effectively avoiding the risk of damage to the circuit caused by the forced rotation of the brushed motor 12 due to being dragged by an external force, and also ensuring the normal operation and rotation effect of the brushed motor 12 under the driving action of the brushed drive circuit 11.

[0020] Figure 2The shown motor and drive module 10 includes a brushless drive circuit 13 and a brushless motor 14 that are electrically connected, and the brushless drive circuit 13 can drive the brushless motor 14 to operate. Exemplarily, the brushless drive circuit 13 can be a three-phase six-tube full-bridge drive circuit or the like. Among them, the brushless drive circuit 13 includes a third terminal and a fourth terminal. The third terminal of the brushless drive circuit 13 is electrically connected to the first connection terminal, and the fourth terminal of the brushless drive circuit 13 is electrically connected to the second connection terminal. It can be understood that the brushless drive circuit 13 and the depletion-type switch unit 21 form a parallel structure, and thus indirectly realizes that the brushless motor 14 and the depletion-type switch unit 21 form a parallel structure. And, exemplarily, the first connection terminal of the depletion-type switch unit 21 can be electrically connected to any one of the third terminal and the fourth terminal of the brushless drive circuit 13, and the second connection terminal of the depletion-type switch unit 21 is electrically connected to the other one of the third terminal and the fourth terminal of the brushless drive circuit 13, without distinguishing the polarity direction of the brushless motor 14. Thus, the use of the depletion-type switch unit 21 provides protection for the brushless motor 14 with a relatively high anti-backdriving ability, mainly including the following three situations: 1) When the entire machine of the drive control system of the motor is powered off, the first control terminal of the depletion-type switch unit 21 cannot access the control signal, so the depletion-type switch unit 21 is in the conducting state, that is, the first connection terminal and the second connection terminal of the depletion-type switch unit 21 are conducting, making the third terminal and the fourth terminal of the brushless drive circuit 13 connected, and the brushless drive circuit 13 is short-circuited. Furthermore, the brushless motor 14 electrically connected to the brushless drive circuit 13 is also clamped. At this time, the brushless motor 14 cannot be forced to rotate by an external force to generate electricity, or the generated voltage of the brushless motor 14 forced to rotate by an external force is clamped at a relatively low level (it can be understood that this relatively low generated voltage will not cause harm to other devices in the drive control system). 2) When the brushless motor 14 is in a standby or sleep state without movement (at this time the brushless motor 14 is powered on), the first control terminal of the depletion-type switch unit 21 can access the effective control signal sent by the system protection signal output terminal 31, so the depletion-type switch unit 21 is in the conducting state, that is, the first connection terminal and the second connection terminal of the depletion-type switch unit 21 are conducting, making the third terminal and the fourth terminal of the brushless drive circuit 13 connected, and the brushless drive circuit 13 is short-circuited. Furthermore, the brushless motor 14 electrically connected to the brushless drive circuit 13 is also clamped. At this time, the brushless motor 14 cannot be forced to rotate by an external force to generate electricity, or the generated voltage of the brushless motor 14 forced to rotate by an external force is clamped at a relatively low level.3) When the brushless motor 14 needs to operate normally (at this time, the brushless motor 14 is powered on), the first control end of the depletion-type switch unit 21 can be connected to the invalid control signal sent by the system protection signal output end 31. Then, the depletion-type switch unit 21 is in an off state, that is, the first connection end and the second connection end of the depletion-type switch unit 21 are disconnected, so that the third end and the fourth end of the brushless drive circuit 13 are not connected, and the short circuit of the brushless drive circuit 13 is removed. Furthermore, the brushless motor 14 electrically connected to the brushless drive circuit 13 is also released from clamping. At this time, the brushless motor 14 can operate normally under the driving of the brushless drive circuit 13. That is to say, the microcontroller can send corresponding control signals or not send control signals through the system protection signal output end 31 to control the conduction or disconnection of the first connection end and the second connection end of the depletion-type switch unit 21, and then short-circuit or remove the short circuit of the brushless drive circuit 13, effectively avoiding the risk of damage to the circuit caused by the brushless motor 14 being forced to rotate by external force and generating electricity, and also ensuring the normal operation and rotation effect of the brushless motor 14 under the driving of the brushless drive circuit 13.

[0021] And, Figure 3 is an enlarged structural schematic diagram of a brushless motor and a brushless drive circuit provided by an embodiment of the present invention. Figure 4 is Figure 3 a current flow direction schematic diagram of the voltage clamping of the brushless motor shown, that is, a current flow direction schematic diagram when the brushless drive circuit 13 is short-circuited. As Figure 3 and Figure 4 shown, the brushless motor 14 includes a first-phase winding 141, a second-phase winding 142, and a third-phase winding 143 (the first-phase winding 141, the second-phase winding 142, and the third-phase winding 143 can be understood as the A phase, B phase, and C phase of the brushless motor 14). One end of the first-phase winding 141 is electrically connected to one end of the second-phase winding 142 and one end of the third-phase winding 143 respectively. The brushless drive circuit 13 includes a first switch tube unit QD1, a second switch tube unit QD2, a third switch tube unit QD3, a fourth switch tube unit QD4, a fifth switch tube unit QD5, and a sixth switch tube unit QD6.

[0022] Among them, the third terminal of the brushless drive circuit 13 is electrically connected to the first terminal of the first switching transistor unit QD1, the first terminal of the third switching transistor unit QD3, and the first terminal of the fifth switching transistor unit QD5. The second terminal of the first switching transistor unit QD1 is electrically connected to the first terminal of the second switching transistor unit QD2 and the other end of the first phase winding 141. The second terminal of the third switching transistor unit QD3 is electrically connected to the first terminal of the fourth switching transistor unit QD4 and the other end of the second phase winding 142. The second terminal of the fifth switching transistor unit QD5 is electrically connected to the first terminal of the sixth switching transistor unit QD6 and the other end of the third phase winding 143. The fourth terminal of the brushless drive circuit 13 is electrically connected to the second terminal of the second switching transistor unit QD2, the second terminal of the fourth switching transistor unit QD4, and the second terminal of the sixth switching transistor unit QD6. Moreover, the control terminals of the first switching transistor unit QD1, the second switching transistor unit QD2, the third switching transistor unit QD3, the fourth switching transistor unit QD4, the fifth switching transistor unit QD5, and the sixth switching transistor unit QD6 are respectively used to receive drive signals to control the alternating conduction or cutoff of the first switching transistor unit QD1, the second switching transistor unit QD2, the third switching transistor unit QD3, the fourth switching transistor unit QD4, the fifth switching transistor unit QD5, and the sixth switching transistor unit QD6, so as to generate a drive voltage for driving the brushless motor 14 to work subsequently. That is, the brushless drive circuit 13 is a three-phase six-transistor full-bridge drive circuit. Figure 4 It can be understood as a schematic diagram of the current path of one phase when the brushless drive circuit 13 is short-circuited in the brushless motor 14. Figure 3 It can also be understood as Figure 2 The enlarged structural schematic diagram of the motor and the drive module 10 shown includes a brushless drive circuit 13 and a brushless motor 14 that are electrically connected.

[0023] Exemplarily, the first switch tube unit QD1, the second switch tube unit QD2, the third switch tube unit QD3, the fourth switch tube unit QD4, the fifth switch tube unit QD5, and the sixth switch tube unit QD6 can all be field effect transistors. The first terminal of the first switch tube unit QD1 is the drain of the field effect transistor, and the second terminal of the first switch tube unit QD1 is the source of the field effect transistor; the first terminal of the second switch tube unit QD2 is the drain of the field effect transistor, and the second terminal of the second switch tube unit QD2 is the source of the field effect transistor; the first terminal of the third switch tube unit QD3 is the drain of the field effect transistor, and the second terminal of the third switch tube unit QD3 is the source of the field effect transistor; the first terminal of the fourth switch tube unit QD4 is the drain of the field effect transistor, and the second terminal of the fourth switch tube unit QD4 is the source of the field effect transistor; the first terminal of the fifth switch tube unit QD5 is the drain of the field effect transistor, and the second terminal of the fifth switch tube unit QD5 is the source of the field effect transistor; the first terminal of the sixth switch tube unit QD6 is the drain of the field effect transistor, and the second terminal of the sixth switch tube unit QD6 is the source of the field effect transistor. When the brushless drive circuit 13 is a three-phase six-tube full-bridge drive circuit, the brushless drive circuit 13 can also clamp the magnitude of the generated voltage of the brushless motor 14 when it is forced to rotate by an external force, that is, the back electromotive force generated when the brushless motor 14 is forced to rotate by an external force will first pass through the body diode of the field effect transistor in the three-phase six-tube full-bridge drive circuit, and then form a short-circuit closed loop with the first connection end and the second connection end of the depletion-type switch unit 21. Since the voltage drop of this body diode is very low, each power generation loop of the brushless motor 14 forms a series structure with two body diodes, so that the total voltage drop of each power generation loop of the brushless motor 14 will not exceed 1.5V, which is equivalent to the brushless drive circuit 13 clamping the brushless motor 14, and the brushless motor 14 cannot generate a higher generated voltage, thereby realizing the protection function.

[0024] In addition, it should be noted that the effective control signal and the invalid control signal sent by the system protection signal output terminal 31 are two relative concepts. In this embodiment, no specific limitation and special requirement are made on the specific signal conditions of the effective control signal and the invalid control signal. In fact, the control signal received by the depletion-type switch unit 21 and that makes the first connection end and the second connection end of the depletion-type switch unit 21 conduct can be called an effective control signal, and the control signal received by the depletion-type switch unit 21 and that makes the first connection end and the second connection end of the depletion-type switch unit 21 disconnect can be called an invalid control signal.

[0025] In the technical solution of the embodiment of the present utility model, the drive control system utilizes the electrical connection relationship between the depletion-type switch unit and the brushed motor or the brushless drive circuit. When the motor stands still or is powered off, the depletion-type switch unit is in a conducting state, short-circuiting the corresponding brushed motor or brushless drive circuit to form a discharge circuit. This allows the generated voltage when the motor that stands still or is powered off is dragged to be consumed through this discharge circuit, without affecting other components in the drive control system, preventing the risk of circuit damage caused by the forced rotation of the corresponding drive motor due to external force pushing and generating electricity. This enables the drive control system to have a high anti-backdriving ability, achieving the effect of active protection through the combination of software and hardware of the circuit, reducing the voltage withstand requirements and component selection requirements of the components in the drive control system, and increasing the overall reliability and safety of the drive control system.

[0026] Optionally, continuing to refer to Figure 1 and Figure 2 the depletion-type switch unit 21 includes a first depletion-type switch subunit 211 and a second depletion-type switch subunit 212; the first depletion-type switch subunit 211 includes a first sub-connection end, a second sub-connection end, and a first sub-control end, and the second depletion-type switch subunit 212 includes a third sub-connection end, a fourth sub-connection end, and a second sub-control end. The first sub-connection end is electrically connected to the first end or the third end as the first connection end, the second sub-connection end is electrically connected to the third sub-connection end, the fourth sub-connection end is electrically connected to the second end or the fourth end as the second connection end, and the first sub-control end is electrically connected to the second sub-control end; the connection node between the second sub-connection end and the third sub-connection end is the first node N1, and the connection node between the first sub-control end and the second sub-control end is the second node N2. The system protection signal output end 31 is electrically connected to the first node N1 and the second node N2 respectively, and the microcontroller is further configured to change the voltage difference between the first node N1 and the second node N2, thereby controlling the conduction or disconnection of the first connection end and the second connection end.

[0027] Specifically, the depletion-type switch unit 21 may refer to a switching device that is in a conducting state when no control signal is applied to the first control end, or the depletion-type switch unit 21 may also refer to a switching device that is in a conducting state or a disconnected state when receiving a control signal sent by the system protection signal output end 31. Thus, according to the parallel structure formed by the depletion-type switch unit 21 and the brushed motor 12 or the brushless drive circuit 13, when the depletion-type switch unit 21 is in a conducting state, the corresponding brushed motor 12 or brushless drive circuit 13 is short-circuited, and when the depletion-type switch unit 21 is in a disconnected state, the corresponding brushed motor 12 or brushless drive circuit 13 is disconnected from the short circuit.

[0028] Further, the depletion-mode switching unit 21 includes a first depletion-mode switching subunit 211 and a second depletion-mode switching subunit 212. Among them, the first depletion-mode switching subunit 211 includes a first sub-connection end, a second sub-connection end, and a first sub-control end, and the second depletion-mode switching subunit 212 includes a third sub-connection end, a fourth sub-connection end, and a second sub-control end.

[0029] In a specific embodiment, Figure 1The shown motor and drive module 10 includes a brushed drive circuit 11 and a brushed motor 12 which are electrically connected. The first sub-connection end of the first depletion-type switch sub-unit 211 is electrically connected to the first end of the brushed motor 12 as the first connection end. The second sub-connection end of the first depletion-type switch sub-unit 211 is electrically connected to the third sub-connection end of the second depletion-type switch sub-unit 212. The fourth sub-connection end of the second depletion-type switch sub-unit 212 is electrically connected to the second end of the brushed motor 12 as the second connection end. It can be understood that the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 form a series structure. After that, the whole of this series structure forms a parallel structure with the brushed motor 12. And the first sub-control end of the first depletion-type switch sub-unit 211 is electrically connected to the second sub-control end of the second depletion-type switch sub-unit 212. The connection node between the second sub-connection end of the first depletion-type switch sub-unit 211 and the third sub-connection end of the second depletion-type switch sub-unit 212 is the first node N1. The connection node between the first sub-control end of the first depletion-type switch sub-unit 211 and the second sub-control end of the second depletion-type switch sub-unit 212 is the second node N2. The system protection signal output end 31 is electrically connected to the first node N1 and the second node N2 respectively. In this way, by using the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212, the brushed motor 12 has protection with a relatively high anti-drag-back ability, mainly including the following three situations: 1) In the case of the whole machine power-off of the drive control system of this motor, the voltages at the first node N1 and the second node N2 are both zero. The first sub-control end of the first depletion-type switch sub-unit 211 and the second sub-control end of the second depletion-type switch sub-unit 212 cannot access the control signal. The voltage difference between the first node N1 and the second node N2 is 0, that is, the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-type switch sub-unit 211 is 0, and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-type switch sub-unit 212 is 0. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the conducting state, that is, the first sub-connection end of the first depletion-type switch sub-unit 211, the second sub-connection end of the first depletion-type switch sub-unit 211, the third sub-connection end of the second depletion-type switch sub-unit 212, and the fourth sub-connection end of the second depletion-type switch sub-unit 212 are conducting, making the first end and the second end of the brushed motor 12 connected, and the brushed motor 12 is short-circuited. At this time, the brushed motor 12 cannot be forced to rotate by an external force to generate electricity.2) When the brushed motor 12 is standby or in sleep state (the brushed motor 12 is powered on at this time), the first sub-control end of the first depletion-mode switch sub-unit 211 and the second sub-control end of the second depletion-mode switch sub-unit 212 can be simultaneously connected to the valid control signal sent by the system protection signal output end 31. The voltage difference between the first node N1 and the second node N2 is 0, that is, the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-mode switch sub-unit 211 is 0, and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-mode switch sub-unit 212 is 0. Then both the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 are in the conducting state, that is, the first sub-connection end of the first depletion-mode switch sub-unit 211, the second sub-connection end of the first depletion-mode switch sub-unit 211, the third sub-connection end of the second depletion-mode switch sub-unit 212, and the fourth sub-connection end of the second depletion-mode switch sub-unit 212 are conducting, making the first end and the second end of the brushed motor 12 connected, and the brushed motor 12 is short-circuited. At this time, the brushed motor 12 cannot be forced to rotate by external force to generate electricity. 3) When the brushed motor 12 needs to work and rotate normally (the brushed motor 12 is powered on at this time), the first sub-control end of the first depletion-mode switch sub-unit 211 and the second sub-control end of the second depletion-mode switch sub-unit 212 can be simultaneously connected to the invalid control signal sent by the system protection signal output end 31. The voltage difference between the first node N1 and the second node N2 is the same, that is, the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-mode switch sub-unit 211 is the same, and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-mode switch sub-unit 212 is the same. Then both the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 are in the off state, that is, the first sub-connection end of the first depletion-mode switch sub-unit 211, the second sub-connection end of the first depletion-mode switch sub-unit 211, the third sub-connection end of the second depletion-mode switch sub-unit 212, and the fourth sub-connection end of the second depletion-mode switch sub-unit 212 are disconnected, making the first end and the second end of the brushed motor 12 not connected, and the brushed motor 12 is released from short circuit. At this time, the brushed motor 12 can work and rotate normally under the driving of the brushed driving circuit 11. That is to say, the microcontroller can send corresponding control signals or not send control signals through the system protection signal output end 31 to change the voltage difference between the first node N1 and the second node N2, that is, change the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-mode switch sub-unit 211, and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-mode switch sub-unit 212, so as to control the conduction or disconnection of the first connection end and the second connection end of the depletion-mode switch unit 21, and further short-circuit or release the short circuit of the brushed motor 12.

[0030] In another specific embodiment,Figure 2The shown motor and drive module 10 includes a brushless drive circuit 13 and a brushless motor 14 that are electrically connected. The first sub-connection end of the first depletion-mode switch sub-unit 211 is electrically connected to the third end of the brushless drive circuit 13 as the first connection end. The second sub-connection end of the first depletion-mode switch sub-unit 211 is electrically connected to the third sub-connection end of the second depletion-mode switch sub-unit 212. The fourth sub-connection end of the second depletion-mode switch sub-unit 212 is electrically connected to the fourth end of the brushless drive circuit 13 as the second connection end. It can be understood that the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 form a series structure. After that, the whole of this series structure forms a parallel structure with the brushless drive circuit 13, and thus indirectly realizes that the brushless motor 14 forms a parallel structure with the depletion-mode switch unit 21. And the first sub-control end of the first depletion-mode switch sub-unit 211 is electrically connected to the second sub-control end of the second depletion-mode switch sub-unit 212. The connection node between the second sub-connection end of the first depletion-mode switch sub-unit 211 and the third sub-connection end of the second depletion-mode switch sub-unit 212 is the first node N1. The connection node between the first sub-control end of the first depletion-mode switch sub-unit 211 and the second sub-control end of the second depletion-mode switch sub-unit 212 is the second node N2. The system protection signal output end 31 is electrically connected to the first node N1 and the second node N2 respectively. In this way, using the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212, the brushless motor 14 has protection with a relatively high anti-drag ability, mainly including the following three situations: 1) When the whole machine of the drive control system of this motor is powered off, the voltages at the first node N1 and the second node N2 are both zero. The first sub-control end of the first depletion-mode switch sub-unit 211 and the second sub-control end of the second depletion-mode switch sub-unit 212 cannot access the control signal. The voltage difference between the first node N1 and the second node N2 is 0, that is, the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-mode switch sub-unit 211 is 0, and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-mode switch sub-unit 212 is 0. Then both the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 are in the conducting state, that is, the first sub-connection end of the first depletion-mode switch sub-unit 211, the second sub-connection end of the first depletion-mode switch sub-unit 211, the third sub-connection end of the second depletion-mode switch sub-unit 212, and the fourth sub-connection end of the second depletion-mode switch sub-unit 212 are conducting, making the third end and the fourth end of the brushless drive circuit 13 connected, and the brushless drive circuit 13 is short-circuited. Furthermore, the brushless motor 14 electrically connected to the brushless drive circuit 13 is also clamped. At this time, the brushless motor 14 cannot be forced to rotate by an external force to generate electricity, or the generated voltage due to the forced rotation of the brushless motor 14 by an external force is clamped at a relatively low level.2) When the brushless motor 14 is in standby or sleep mode (with the brushless motor 14 powered on at this time), the first sub-control terminal of the first depletion-type switch sub-unit 211 and the second sub-control terminal of the second depletion-type switch sub-unit 212 can simultaneously receive the valid control signal issued by the system protection signal output terminal 31. The voltage difference between the first node N1 and the second node N2 is 0, that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is 0, and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is 0. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the conducting state, that is, the first sub-connection terminal of the first depletion-type switch sub-unit 211, the second sub-connection terminal of the first depletion-type switch sub-unit 211, the third sub-connection terminal of the second depletion-type switch sub-unit 212, and the fourth sub-connection terminal of the second depletion-type switch sub-unit 212 are conducting, making the third terminal and the fourth terminal of the brushless drive circuit 13 connected. The brushless drive circuit 13 is short-circuited, and thus the brushless motor 14 electrically connected to the brushless drive circuit 13 is also clamped. At this time, the brushless motor 14 cannot be forced to rotate by an external force to generate electricity, or the generated voltage of the brushless motor 14 due to being forced to rotate by an external force is clamped at a low level. 3) When the brushless motor 14 needs to operate normally (with the brushless motor 14 powered on at this time), the first sub-control terminal of the first depletion-type switch sub-unit 211 and the second sub-control terminal of the second depletion-type switch sub-unit 212 can simultaneously receive the invalid control signal issued by the system protection signal output terminal 31. The voltage difference between the first node N1 and the second node N2 is the same, that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is the same, and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is the same. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the off state, that is, the first sub-connection terminal of the first depletion-type switch sub-unit 211, the second sub-connection terminal of the first depletion-type switch sub-unit 211, the third sub-connection terminal of the second depletion-type switch sub-unit 212, and the fourth sub-connection terminal of the second depletion-type switch sub-unit 212 are disconnected, making the third terminal and the fourth terminal of the brushless drive circuit 13 not connected. The brushless drive circuit 13 is released from short-circuit, and thus the brushless motor 14 electrically connected to the brushless drive circuit 13 is also released from clamping. At this time, the brushless motor 14 can operate normally under the driving of the brushless drive circuit 13.That is, the microcontroller can send a corresponding control signal or not send a control signal through the system protection signal output terminal 31 to change the voltage difference between the first node N1 and the second node N2, that is, change the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-type switch sub-unit 211, and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-type switch sub-unit 212, so as to control the conduction or disconnection between the first connection end and the second connection end of the depletion-type switch unit 21, and then short-circuit or remove the short-circuit of the brushless drive circuit 13.

[0031] Further, continue to refer to Figure 1 and Figure 2 , the first depletion-type switch sub-unit 211 includes a first NMOS transistor Q1, the drain D of the first NMOS transistor Q1 is the first sub-connection end, the source S of the first NMOS transistor Q1 is the second sub-connection end, and the gate G of the first NMOS transistor Q1 is the first sub-control end; the second depletion-type switch sub-unit 212 includes a second NMOS transistor Q2, the source S of the second NMOS transistor Q2 is the third sub-connection end, the drain D of the second NMOS transistor Q2 is the fourth sub-connection end, and the gate G of the second NMOS transistor Q2 is the second sub-control end.

[0032] Specifically, the first depletion-mode switch sub-unit 211 includes an N-channel first NMOS transistor Q1, and the second depletion-mode switch sub-unit 212 includes an N-channel second NMOS transistor Q2. Wherein, the source S of the first NMOS transistor Q1 and the source S of the second NMOS transistor Q2 are respectively electrically connected to the first node N1, and the gate G of the first NMOS transistor Q1 and the gate G of the second NMOS transistor Q2 are respectively electrically connected to the second node N2. Thus, after the voltage difference between the first node N1 and the second node N2 changes, the voltage difference between the gate G and the source S of the first NMOS transistor Q1 changes accordingly, and the voltage difference between the gate G and the source S of the second NMOS transistor Q2 changes accordingly. Moreover, the voltage difference between the gate G and the source S of the first NMOS transistor Q1 and the voltage difference between the gate G and the source S of the second NMOS transistor Q2 are at the same potential, so as to facilitate the synchronization of the on-state or off-state of the first NMOS transistor Q1 and the second NMOS transistor Q2. Exemplarily, when the entire machine of the drive control system of the motor is powered off, the voltage difference between the first node N1 and the second node N2 is 0, that is, the voltage difference between the gate G and the source S of the first NMOS transistor Q1 is 0, and the voltage difference between the gate G and the source S of the second NMOS transistor Q2 is 0. Then both the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 are in the on-state, and then the brushed motor 12 or the brushless drive circuit 13 is short-circuited. Or, when the brushed motor 12 or the brushless motor 14 stands by or sleeps without moving (at this time the brushed motor 12 or the brushless motor 14 is powered on), the voltage difference between the first node N1 and the second node N2 is 0, that is, the voltage difference between the gate G and the source S of the first NMOS transistor Q1 is 0, and the voltage difference between the gate G and the source S of the second NMOS transistor Q2 is 0, and it is a valid control signal. Then both the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 are in the on-state, and then the brushed motor 12 or the brushless drive circuit 13 is short-circuited. Or, when the brushed motor 12 or the brushless motor 14 needs to work and rotate normally (at this time the brushed motor 12 or the brushless motor 14 is powered on), the voltage difference between the first node N1 and the second node N2 is the same, that is, the voltage difference between the gate G and the source S of the first NMOS transistor Q1 is the same, and the voltage difference between the gate G and the source S of the second NMOS transistor Q2 is the same, and it is an invalid control signal. Then both the first depletion-mode switch sub-unit 211 and the second depletion-mode switch sub-unit 212 are in the off-state, and then the short circuit of the brushed motor 12 or the brushless drive circuit 13 is removed.

[0033] Optionally, continuing to refer to Figure 1 and Figure 2 , the motor anti-backdrive module 20 further includes an opto-coupling unit 22; the opto-coupling unit 22 includes a first signal input terminal, a first signal output terminal, and a second signal output terminal. The first signal input terminal is electrically connected to the system protection signal output terminal 31, the first signal output terminal is electrically connected to the first node N1, the second signal output terminal is electrically connected to the second node N2, and the microcontroller is further configured to change the voltage difference between the first signal output terminal and the second signal output terminal, thereby changing the voltage difference between the first node N1 and the second node N2.

[0034] Specifically, the motor anti-backdrive module 20 includes a depletion-type switch unit 21 and an opto-coupling unit 22. Among them, the depletion-type switch unit 21 includes a first depletion-type switch sub-unit 211 and a second depletion-type switch sub-unit 212, and the opto-coupling unit 22 includes a first signal input terminal, a first signal output terminal, and a second signal output terminal. Exemplarily, the first signal output terminal may be the positive output terminal of the opto-coupling unit 22, and the second signal output terminal may be the negative output terminal of the opto-coupling unit 22. The first signal input terminal of the opto-coupling unit 22 is electrically connected to the system protection signal output terminal 31, the first signal output terminal of the opto-coupling unit 22 is electrically connected to the first node N1, and the second signal output terminal of the opto-coupling unit 22 is electrically connected to the second node N2. In this way, the opto-coupling unit 22 can not only achieve electrical isolation between the system protection signal output terminal 31 and the depletion-type switch unit 21, but also make the first signal output terminal and the second signal output terminal have a potential difference according to the high-level signal output by the system protection signal output terminal 31. Based on this, in this embodiment, the overall combination of the depletion-type switch unit 21 and the opto-coupling unit 22 can be understood as a micro-power isolation relay. Exemplarily, the opto-coupling unit 22 may be an optotransistor.

[0035] In a specific embodiment, Figure 1The shown motor and drive module 10 includes a brush-type drive circuit 11 and a brush-type motor 12 which are electrically connected. The use of the opto-coupling unit 22, the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 enables the brush-type motor 12 to have protection with a high anti-backdriving ability, mainly including the following three situations: 1) When the whole machine of the drive control system of the motor is powered off, the voltage difference between the first signal output terminal and the second signal output terminal of the opto-coupling unit 22 is 0, then the voltage difference between the first node N1 and the second node N2 is also 0, that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is 0, and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is 0. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the conducting state, making the first end and the second end of the brush-type motor 12 connected, and the brush-type motor 12 is short-circuited. At this time, the brush-type motor 12 cannot be forced to rotate by an external force to generate electricity. 2) When the brush-type motor 12 is in standby or sleep state (at this time the brush-type motor 12 is powered on), the first signal input terminal of the opto-coupling unit 22 receives a valid control signal (at this time, the valid control signal can be a low-level signal) sent from the system protection signal output terminal 31. Exemplarily, there may be no output voltage at both the first signal output terminal and the second signal output terminal of the opto-coupling unit 22, that is, the voltage difference between the first signal output terminal and the second signal output terminal of the opto-coupling unit 22 is 0. Then the voltage difference between the first node N1 and the second node N2 is also 0, that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is 0, and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is 0. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the conducting state, making the first end and the second end of the brush-type motor 12 connected, and the brush-type motor 12 is short-circuited. At this time, the brush-type motor 12 cannot be forced to rotate by an external force to generate electricity.3) When the brushed motor 12 needs to operate normally (at this time, the brushed motor 12 is powered on), the first signal input terminal of the optocoupler unit 22 receives the invalid control signal sent by the system protection signal output terminal 31 (at this time, the invalid control signal is a high-level signal). If the voltage difference between the first signal output terminal and the second signal output terminal of the optocoupler unit 22 is not 0 (exemplarily, it can be 5V), then the voltage difference between the first node N1 and the second node N2 is also not 0 (exemplarily, it can be 5V), that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is not 0 (exemplarily, it can be -5V), and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is not 0 (exemplarily, it can be -5V). Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the off state, making the first end and the second end of the brushed motor 12 not connected, and the brushed motor 12 is released from the short circuit. At this time, the brushed motor 12 can operate normally under the driving of the brushed drive circuit 11. That is, the microcontroller can send a corresponding control signal or not send a control signal through the system protection signal output terminal 31 to change the voltage difference between the first signal output terminal and the second signal output terminal of the optocoupler unit 22, and then change the voltage difference between the first node N1 and the second node N2, and then control the conduction or disconnection of the first connection terminal and the second connection terminal of the depletion-type switch unit 21, and then short-circuit or release the short circuit of the brushed motor 12.

[0036] In another specific embodiment, Figure 2The shown motor and drive module 10 includes a brushless drive circuit 13 and a brushless motor 14 which are electrically connected. The opto-coupling unit 22, the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 provide protection for the brushless motor 14 to have a high anti-drag ability, mainly including the following three cases: 1) When the whole machine of the drive control system of the motor is powered off, the voltage difference between the first signal output terminal and the second signal output terminal of the opto-coupling unit 22 is 0, then the voltage difference between the first node N1 and the second node N2 is also 0, that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is 0, and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is 0. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the conducting state, making the third terminal and the fourth terminal of the brushless drive circuit 13 connected, the brushless drive circuit 13 is short-circuited, and further the brushless motor 14 electrically connected to the brushless drive circuit 13 is also clamped. At this time, the brushless motor 14 cannot be forced to rotate by external force to generate electricity, or the generated voltage of the brushless motor 14 due to forced rotation by external force is clamped at a low level. 2) When the brushless motor 14 is in standby or sleep state (at this time the brushless motor 14 is powered on), the first signal input terminal of the opto-coupling unit 22 receives a valid control signal sent from the system protection signal output terminal 31. Exemplarily, the first signal output terminal and the second signal output terminal of the opto-coupling unit 22 may both have no output voltage, that is, the voltage difference between the first signal output terminal and the second signal output terminal of the opto-coupling unit 22 is 0, then the voltage difference between the first node N1 and the second node N2 is also 0, that is, the voltage difference between the first sub-control terminal and the second sub-connection terminal of the first depletion-type switch sub-unit 211 is 0, and the voltage difference between the second sub-control terminal and the third sub-connection terminal of the second depletion-type switch sub-unit 212 is 0. Then both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the conducting state, making the third terminal and the fourth terminal of the brushless drive circuit 13 connected, the brushless drive circuit 13 is short-circuited, and further the brushless motor 14 electrically connected to the brushless drive circuit 13 is also clamped. At this time, the brushless motor 14 cannot be forced to rotate by external force to generate electricity, or the generated voltage of the brushless motor 14 due to forced rotation by external force is clamped at a low level.3) When the brushless motor 14 needs to work and rotate normally (at this time, the brushless motor 14 is powered on), the first signal input end of the opto-coupling unit 22 accesses the invalid control signal sent by the system protection signal output end 31. Exemplarily, there may be an output voltage between the first signal output end and the second signal output end of the opto-coupling unit 22, that is, the voltage difference between the first signal output end and the second signal output end of the opto-coupling unit 22 is not 0 (exemplarily, it can be 5V). Then, the voltage difference between the first node N1 and the second node N2 is also not 0 (exemplarily, it can be 5V). That is, the voltage difference between the first sub-control end and the second sub-connection end of the first depletion-type switch sub-unit 211 is not 0 (exemplarily, it can be -5V), and the voltage difference between the second sub-control end and the third sub-connection end of the second depletion-type switch sub-unit 212 is not 0 (exemplarily, it can be -5V). Then, both the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 are in the off state, so that the third end and the fourth end of the brushless drive circuit 13 are not connected, the brushless drive circuit 13 is released from being short-circuited, and further, the brushless motor 14 electrically connected to the brushless drive circuit 13 is also released from being clamped. At this time, the brushless motor 14 can work and rotate normally under the driving action of the brushless drive circuit 13. That is, the microcontroller can send a corresponding control signal or not send a control signal through the system protection signal output end 31 to change the voltage difference between the first signal output end and the second signal output end of the opto-coupling unit 22, and then change the voltage difference between the first node N1 and the second node N2, and then control the conduction or disconnection of the first connection end and the second connection end of the depletion-type switch unit 21, and then short-circuit or release the short-circuit of the brushless drive circuit 13.

[0037] Further, continuing to refer to Figure 1 and Figure 2 , the motor anti-back-drag module 20 further includes a first resistor R1; one end of the first resistor R1 is electrically connected to the first signal output end and the first node N1 respectively, and the other end of the first resistor R1 is electrically connected to the second signal output end and the second node N2 respectively.

[0038] Specifically, the setting of the electrical connection relationship of the first resistor R1 ensures that the first sub-control end and the second sub-connection end of the first depletion-type switch sub-unit 211 are connected to an equipotential, and ensures that the second sub-control end and the third sub-connection end of the second depletion-type switch sub-unit 212 are connected to an equipotential, so as to ensure that the first depletion-type switch sub-unit 211 and the second depletion-type switch sub-unit 212 can be in the on state or the off state simultaneously.

[0039] Optionally, continuing to refer to Figure 1, in a specific embodiment, the drive control system of the motor further includes a power supply module 40. The power supply module 40 includes a drive voltage output terminal. The brushed drive circuit 11 includes a brushed drive voltage input terminal, and the drive voltage output terminal is electrically connected to the brushed drive voltage input terminal. The power supply module 40 is used to provide a brushed drive voltage to the brushed drive circuit 11.

[0040] Alternatively, continue to refer to Figure 2 , in another specific embodiment, the drive control system of the motor further includes a power supply module 40. The power supply module 40 includes a drive voltage output terminal. The third terminal of the brushless drive circuit 13 is multiplexed as a brushless drive voltage input terminal, and the drive voltage output terminal is electrically connected to the brushless drive voltage input terminal. The power supply module 40 is used to provide a brushless drive voltage to the brushless drive circuit 13.

[0041] Specifically, the drive control system of the motor includes a motor, a drive module 10, a motor anti-back-driving module 20, a microcontroller, and a power supply module 40. Among them, the power supply module 40 includes a drive voltage output terminal. The power supply module 40 can process the external voltage into the drive voltage required by the motor and the drive module 10 to maintain the normal operation of the motor and the drive module 10. Figure 1 The shown brushed drive circuit 11 includes a brushed drive voltage input terminal, and the drive voltage output terminal is electrically connected to the brushed drive voltage input terminal. The power supply module 40 can provide a brushed drive voltage to the brushed drive circuit 11 so that the subsequent brushed drive circuit 11 can drive the brushed motor 12 to rotate normally. Figure 2 The third terminal of the shown brushless drive circuit 13 is multiplexed as a brushless drive voltage input terminal, and the drive voltage output terminal is electrically connected to the brushless drive voltage input terminal. The power supply module 40 can provide a brushless drive voltage to the brushless drive circuit 13 so that the subsequent brushless drive circuit 13 can drive the brushless motor 14 to rotate normally. Exemplarily, the brushed drive voltage or the brushless drive voltage provided by the power supply module 40 can be 12V.

[0042] Optionally, continue to refer to Figure 1 and Figure 2 , the power supply module 40 further includes a first switch unit 41 and a power-on anti-short-circuit unit 42. The first switch unit 41 includes a third connection terminal, a fourth connection terminal, and a second control terminal. The power-on anti-short-circuit unit 42 includes a fifth terminal, a sixth terminal, and a seventh terminal. The power supply module 40 further includes an external voltage input terminal, and the microcontroller further includes a system control signal output terminal 32. The fifth terminal is respectively electrically connected to the external voltage input terminal and the third connection terminal. The fourth connection terminal is electrically connected to the drive voltage output terminal. The second control terminal is respectively electrically connected to the system control signal output terminal 32 and the sixth terminal. The seventh terminal is grounded. The power-on anti-short-circuit unit 42 is used to control the conduction or disconnection of the fifth terminal and the sixth terminal.

[0043] Specifically, since there is a certain probability that the depletion-type switching unit 21 will short-circuit the brushed motor 12 or the brushless motor 14 at the power-on moment of the drive control system of the motor, the short-circuit current passing through the brushed motor 12 or the brushless motor 14 is too large, causing harm to the brushed motor 12 or the brushless motor 14. Exemplarily, at the power-on moment, the output signals of each pin of the microcontroller are uncertain. It may be that the control signal is sent from the system control signal output terminal 32 to cause the drive voltage to be transmitted to the brushed motor 12 or the brushless motor 14 prematurely. It may also be that the control signal is sent from the system protection signal output terminal 31 to cause the first connection end and the second connection end of the depletion-type switching unit 21 to conduct, so that the corresponding brushed motor 12 or the brushless drive circuit 13 is released from the short circuit relatively late. It may also be that the brushed drive circuit 11 or the brushless drive circuit 13 remains in the on state under the influence of voltage or control signal. Therefore, to avoid the occurrence of the above situation, an additional circuit for anti-short-circuit safety measures is added to the power supply module 40 in this embodiment.

[0044] The power supply module 40 includes a first switch unit 41 and a power-on short-circuit prevention unit 42. The first switch unit 41 includes a third connection terminal, a fourth connection terminal and a second control terminal, the power-on short-circuit prevention unit 42 includes a fifth terminal, a sixth terminal and a seventh terminal, the power supply module 40 also includes an external voltage input terminal, and the microcontroller also includes a system control signal output terminal 32. Generally speaking, the power supply module 40 is only provided with the first switch unit 41. At the power-on moment, the first switch unit 41 is in a conducting state. The power supply module 40 can process the external voltage into a driving voltage and transmit it to the corresponding brushed drive circuit 11 or brushless drive circuit 13. In order to prevent the occurrence of a short circuit and the brushed motor 12 or the brushless motor 14 from being subjected to a higher short-circuit current, the power supply module 40 needs to be additionally provided with a power-on short-circuit prevention unit 42. Among them, the fifth end of the power-on short-circuit protection unit 42 is electrically connected to the external voltage input end and the third connection end of the first switch unit 41, the fourth connection end of the first switch unit 41 is electrically connected to the drive voltage output end, the second control end of the first switch unit 41 is electrically connected to the system control signal output end 32 and the sixth end of the power-on short-circuit protection unit 42, and the seventh end of the power-on short-circuit protection unit 42 is grounded. In this way, during the power-on moment of the drive control system of the motor and the period when the voltage has not stabilized, the setting of the power-on short-circuit protection unit 42 can make the first switch unit 41 in a reliable cut-off state, thereby making it impossible for the drive voltage processed by the power supply module 40 to be transmitted to the corresponding brush drive circuit 11 or brushless drive circuit 13, so that the voltage between the brush drive circuit 11 and the brush motor 12 or the brushless drive circuit 13 and the brushless motor 14 is cut off, even if the brush motor 12 or the brushless drive circuit 13 is short-circuited by the depletion switch unit 21, no short-circuit current will be formed, that is, the hidden danger of short circuit at the power-on moment is avoided. That is, at the moment of power-on of the drive control system of the motor and when the voltage has not stabilized, the power-on short-circuit protection unit 42 can control the conduction of the fifth and sixth terminals of the power-on short-circuit protection unit 42, thereby controlling the disconnection of the third and fourth connection terminals of the first switch unit 41, that is, controlling the first switch unit 41 to be in a reliable cut-off state, and the driving voltage cannot be transmitted to the corresponding brush drive circuit 11 or brushless drive circuit 13. And, after the voltage at the moment of power-on of the drive control system of the motor stabilizes, the power-on short-circuit protection unit 42 can control the disconnection of the fifth and sixth terminals of the power-on short-circuit protection unit 42, thereby controlling the conduction of the third and fourth connection terminals of the first switch unit 41, that is, controlling the first switch unit 41 to release the cut-off state and be in a reliable conduction state, at which time the driving voltage can be transmitted to the corresponding brush drive circuit 11 or brushless drive circuit 13.

[0045] Further, continue to refer to Figure 1 and Figure 2, the power-on short-circuit prevention unit 42 includes a first transistor Q3, a first capacitor C1, and a second resistor R2; the first transistor Q3 includes a fifth sub-connection end, a sixth sub-connection end, and a third sub-control end. The fifth sub-connection end is used as a fifth terminal and is electrically connected to the external voltage input terminal and the third connection end respectively. The sixth sub-connection end is used as a sixth terminal and is electrically connected to the system control signal output terminal 32 and the second control end respectively. The third sub-control end is electrically connected to one end of the first capacitor C1. The other end of the first capacitor C1 is electrically connected to one end of the second resistor R2. The other end of the second resistor R2 is grounded as a seventh terminal.

[0046] Specifically, at the power-on moment, the first capacitor C1 can be charged through the second resistor R2. Then, a control current is generated at the third sub-control end of the first transistor Q3, making the first transistor Q3 saturated and conducting, short-circuiting the third connection end and the fourth connection end of the first switch unit 41, so that the first switch unit 41 is in a reliable cut-off state and cannot conduct. After that, when the first capacitor C1 is fully charged through the second resistor R2, there is no control current at the third sub-control end of the first transistor Q3, making the first transistor Q3 cut off and disconnecting the short circuit between the third connection end and the fourth connection end of the first switch unit 41. And at this time, the system control signal output terminal 32 can send a control signal to the second control end of the first switch unit 41 to make the third connection end and the fourth connection end of the first switch unit 41 conduct, that is, to make the first switch unit 41 in a conducting state. It can be understood that the time for the first capacitor C1 to be charged through the second resistor R2 can also be understood as the time for delaying the turn-on of the first switch unit 41 and the driving voltage. The time for the first capacitor C1 to be charged through the second resistor R2 needs to be greater than the total duration at the power-on moment. In addition, exemplarily, the delay time for turning on the first switch unit 41 and the driving voltage can be changed by reasonably adjusting the capacitance value of the first capacitor C1 and / or the resistance value of the second resistor R2.

[0047] Optionally, continue to refer to Figure 1 and Figure 2 , the first switch unit 41 includes a first PMOS transistor Q4. The source S of the first PMOS transistor Q4 is used as the third connection end and is electrically connected to the fifth terminal of the power-on short-circuit prevention unit 42. The drain D of the first PMOS transistor Q4 is used as the fourth connection end and is electrically connected to the driving voltage output terminal. The gate G of the first PMOS transistor Q4 is used as the second control end and is electrically connected to the system control signal output terminal 32 and the sixth terminal respectively. The first PMOS transistor Q4 can determine whether to be in a conducting state or a cut-off state according to the control signal received by the gate G of the first PMOS transistor Q4 and the magnitude of the voltage difference between the source S and the gate G of the first PMOS transistor Q4.

[0048] Optionally, continue to refer to Figure 1 and Figure 2, the power-on short-circuit prevention unit 42 further includes a second capacitor C2; one end of the second capacitor C2 is electrically connected to the fifth sub-connection end, and the other end of the second capacitor C2 is electrically connected to the sixth sub-connection end. The second capacitor C2 can play a role in assisting power-on delay.

[0049] Optionally, continue to refer to Figure 1 and Figure 2 , the power supply module 40 further includes a second switch unit 43; the second switch unit 43 includes a fifth connection end, a sixth connection end, and a third control end, the fifth connection end is electrically connected to the second control end, the sixth connection end is grounded, and the third control end is electrically connected to the system control signal output end 32; the microcontroller is further configured to control the conduction or disconnection of the fifth connection end and the sixth connection end.

[0050] Specifically, the power supply module 40 includes a first switch unit 41, a power-on short-circuit prevention unit 42, and a second switch unit 43. Among them, the second switch unit 43 includes a fifth connection end, a sixth connection end, and a third control end, the fifth connection end is electrically connected to the second control end, the sixth connection end is grounded, and the third control end is electrically connected to the system control signal output end 32. Thus, after the third control end of the second switch unit 43 receives the control signal sent by the system control signal output end 32, the second switch unit 43 is in a conducting state, so that the second control end of the first switch unit 41 is grounded, and after the short circuit between the third connection end and the second control end of the first switch unit 41 is removed, the first switch unit 41 can be converted from a cut-off state to a conducting state, so as to facilitate the subsequent transmission of the driving voltage to the corresponding brushed driving circuit 11 or brushless driving circuit 13. That is, at the power-on moment, the microcontroller can also control the conduction of the fifth connection end and the sixth connection end of the second switch unit 43, and then control the conduction of the third connection end and the fourth connection end of the first switch unit 41. Or, at the power-off moment, the microcontroller can also control the disconnection of the fifth connection end and the sixth connection end of the second switch unit 43, and then control the disconnection of the third connection end and the fourth connection end of the first switch unit 41.

[0051] In addition, the power supply module 40 further includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. Among them, one end of the third capacitor C3 is electrically connected to the external voltage input terminal, and the other end of the third capacitor C3 is grounded. The third capacitor C3 can play a filtering role. The fourth capacitor C4 and the fifth capacitor C5 form a parallel structure, and one end of the fourth capacitor C4 is electrically connected to the drive voltage output terminal, and the other end of the fourth capacitor C4 is grounded. The fourth capacitor C4 and the fifth capacitor C5 can play a filtering role. The third resistor R3 and the second capacitor C2 form a parallel structure, and the third resistor R3 can be used as a loop for energy storage release of the second capacitor C2. One end of the fourth resistor R4 is electrically connected to the system control signal output terminal 32, and the other end of the fourth resistor R4 is electrically connected to the third control terminal of the second switch unit 43. One end of the fifth resistor R5 is electrically connected to the fifth connection terminal of the second switch unit 43, and the other end of the fifth resistor R5 is electrically connected to the second control terminal of the first switch unit 41. The fourth resistor R4 and the fifth resistor R5 can play a role in voltage division and current limiting. In addition, the motor anti-backdriving module 20 further includes a sixth resistor R6. One end of the sixth resistor R6 is electrically connected to the system protection signal output terminal 31, and the other end of the sixth resistor R6 is electrically connected to the first signal input terminal of the optocoupler unit 22. The sixth resistor R6 can play a role in voltage division and current limiting. The optocoupler unit 22 further includes a second signal input terminal, and the second signal input terminal is grounded. Exemplarily, the second signal input terminal can be the positive input terminal of the optocoupler unit 22, and the second signal input terminal can be the negative input terminal of the optocoupler unit 22. In addition, this embodiment shows that the microcontroller includes a system protection signal output terminal 31 and a system control signal output terminal 32. In fact, the microcontroller may further include other pins to ensure the normal operation and rotation of the brushed motor 12 or the brushless motor 14, which will not be exemplified one by one here.

[0052] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it may include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A motor drive control system, characterized in that: Including motor and drive module, motor anti-reverse drag module and microcontroller; The motor anti-reverse drag module includes a depletion type switch unit, the depletion type switch unit includes a first connection end, a second connection end and a first control end, the microcontroller includes a system protection signal output end, and the first control end is electrically connected to the system protection signal output end; The motor and drive module comprises an electrically connected brushed drive circuit and a brushed motor, the brushed motor comprises a first end and a second end, the first end is electrically connected to the first connection end, and the second end is electrically connected to the second connection end; Alternatively, the motor and drive module include an electrically connected brushless drive circuit and a brushless motor, the brushless drive circuit includes a third end and a fourth end, the third end is electrically connected to the first connection end, and the fourth end is electrically connected to the second connection end.

2. The driving control system according to claim 1, characterized in that: The depletion-type switch unit comprises a first depletion-type switch subunit and a second depletion-type switch subunit; The first depletion-type switch subunit includes a first sub-connection terminal, a second sub-connection terminal, and a first sub-control terminal, the second depletion-type switch subunit includes a third sub-connection terminal, a fourth sub-connection terminal, and a second sub-control terminal, the first sub-connection terminal is electrically connected to the first terminal or the third terminal as the first connection terminal, the second sub-connection terminal is electrically connected to the third sub-connection terminal, the fourth sub-connection terminal is electrically connected to the second terminal or the fourth terminal as the second connection terminal, and the first sub-control terminal is electrically connected to the second sub-control terminal; The connection node between the first sub-control terminal and the second sub-control terminal is a first node, the connection node between the second sub-connection terminal and the third sub-connection terminal is a second node, and the system protection signal output terminal is electrically connected to the first node and the second node respectively.

3. The driving control system according to claim 2, characterized in that: The first depletion-type switch subunit includes a first NMOS tube, a drain of the first NMOS tube is the first sub-connection terminal, a source of the first NMOS tube is the second sub-connection terminal, and a gate of the first NMOS tube is the first sub-control terminal; The second depletion-type switch subunit includes a second NMOS tube, a source of the second NMOS tube is the third sub-connection terminal, a drain of the second NMOS tube is the fourth sub-connection terminal, and a gate of the second NMOS tube is the second sub-control terminal.

4. The driving control system according to claim 2, characterized in that: The motor anti-reverse drag module also includes a photoelectric coupling unit; The photoelectric coupling unit includes a first signal input terminal, a first signal output terminal, and a second signal output terminal. The first signal input terminal is electrically connected to the system protection signal output terminal, the first signal output terminal is electrically connected to the first node, and the second signal output terminal is electrically connected to the second node.

5. The driving control system according to claim 4, characterized in that: The motor anti-reverse drag module also includes a first resistor; One end of the first resistor is electrically connected to the first signal output end and the first node respectively, and the other end of the first resistor is electrically connected to the second signal output end and the second node respectively.

6. The driving control system according to claim 1, characterized in that: The brushless motor comprises a first phase winding, a second phase winding and a third phase winding; one end of the first phase winding is electrically connected to one end of the second phase winding and one end of the third phase winding respectively; The brushless drive circuit includes a first switch tube unit, a second switch tube unit, a third switch tube unit, a fourth switch tube unit, a fifth switch tube unit and a sixth switch tube unit; the third end is electrically connected to the first terminal of the first switch tube unit, the first terminal of the third switch tube unit and the first terminal of the fifth switch tube unit, respectively; the second terminal of the first switch tube unit is electrically connected to the first terminal of the second switch tube unit and the other end of the first phase winding, respectively; the second terminal of the third switch tube unit is electrically connected to the first terminal of the fourth switch tube unit and the other end of the second phase winding, respectively; the second terminal of the fifth switch tube unit is electrically connected to the first terminal of the sixth switch tube unit and the other end of the third phase winding, respectively; the fourth end is electrically connected to the second terminal of the second switch tube unit, the second terminal of the fourth switch tube unit and the second terminal of the sixth switch tube unit, respectively.

7. The driving control system according to claim 6, characterized in that: The first switch tube unit, the second switch tube unit, the third switch tube unit, the fourth switch tube unit, the fifth switch tube unit and the sixth switch tube unit are all field effect tubes.

8. The driving control system according to claim 1, characterized in that: It also includes a power supply module, which includes a driving voltage output terminal; The brush driving circuit comprises a brush driving voltage input terminal, and the driving voltage output terminal is electrically connected to the brush driving voltage input terminal; Alternatively, the third terminal of the brushless driving circuit is multiplexed as a brushless driving voltage input terminal, and the driving voltage output terminal is electrically connected to the brushless driving voltage input terminal.

9. The driving control system according to claim 8, characterized in that: The power supply module also includes a first switch unit and a power-on short-circuit prevention unit; The first switch unit includes a third connection terminal, a fourth connection terminal and a second control terminal, the power-on short circuit protection unit includes a fifth terminal, a sixth terminal and a seventh terminal, the power supply module also includes an external voltage input terminal, and the microcontroller also includes a system control signal output terminal. The fifth terminal is electrically connected to the external voltage input terminal and the third connection terminal respectively, the fourth connection terminal is electrically connected to the driving voltage output terminal, the second control terminal is electrically connected to the system control signal output terminal and the sixth terminal respectively, and the seventh terminal is grounded.

10. The driving control system according to claim 9, characterized in that: The power-on short-circuit prevention unit includes a first transistor, a first capacitor and a second resistor; The first transistor includes a fifth sub-connection terminal, a sixth sub-connection terminal and a third sub-control terminal. The fifth sub-connection terminal serves as the fifth terminal and is electrically connected to the external voltage input terminal and the third connection terminal respectively. The sixth sub-connection terminal serves as the sixth terminal and is electrically connected to the system control signal output terminal and the second control terminal respectively. The third sub-control terminal is electrically connected to one end of the first capacitor, the other end of the first capacitor is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded as the seventh end.

11. The driving control system according to claim 10, characterized in that: The power-on short-circuit protection unit further includes a second capacitor; One end of the second capacitor is electrically connected to the fifth sub-connection end, and the other end of the second capacitor is electrically connected to the sixth sub-connection end.

12. The driving control system according to claim 9, characterized in that: The power supply module also includes a second switch unit; The second switch unit includes a fifth connection terminal, a sixth connection terminal and a third control terminal, the fifth connection terminal is electrically connected to the second control terminal, the sixth connection terminal is grounded, and the third control terminal is electrically connected to the system control signal output terminal.

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