Push rod motor drive control circuit

Abstract

The invention discloses a push rod motor driving control circuit which comprises a driver chip, a voltage stabilizing module, a driving signal providing module, a current detection module, an EMI filtering module, a stroke detection module and a motor connector. The driver chip comprises a voltage end pin, an input pin, an output pin and a GND pin; the first power supply is electrically connected with the voltage end pin through the voltage stabilizing module; the driving signal providing module is electrically connected with the input pin; the current detection module is electrically connected with the GND pin; the output pin is electrically connected with the motor connector through the EMI filtering module; and the motor connector is also electrically connected with the stroke detection module. According to the technical scheme, the push rod motor can safely control the operation of the motor, and the design is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drivers, and in particular to a push rod motor drive control circuit. Background Art

[0002] With the rapid development of social economy and the continuous improvement of people's living standards, the functions of ordinary beds can no longer meet users' high-quality life needs. Many people have begun to pursue electric beds with more functions and greater comfort.

[0003] Existing electric beds can integrate functions such as head lift, head lowering, and foot lift and lowering according to user needs. To achieve these functions, the electric bed requires integrated push rod motors and corresponding drive control circuits. Due to the special characteristics of electric beds, their control modules need to be designed to be sufficiently small to improve aesthetics and practicality. Therefore, a push rod motor control circuit with a simple design that can safely control motor operation is urgently needed. Summary of the Invention

[0004] The present invention provides a push rod motor driving circuit to solve the defects in the prior art, achieve the purpose of safely controlling the operation of the motor, and have a simple design.

[0005] According to one aspect of the present invention, a push rod motor drive control circuit is provided, comprising: a driver chip, a voltage stabilization module, a drive signal providing module, a current detection module, an EMI filter module, a stroke detection module and a motor connector;

[0006] The driver chip includes a voltage terminal pin, an input pin, an output pin and a GND pin;

[0007] The first power supply is electrically connected to the voltage terminal pin through the voltage stabilizing module; the driving signal providing module is electrically connected to the input pin; and the current detection module is electrically connected to the GND pin.

[0008] The output pin is electrically connected to the motor connector through the EMI filter module; the motor connector is also electrically connected to the stroke detection module.

[0009] Optionally, the voltage stabilizing module includes a first capacitor and a second capacitor;

[0010] The positive electrode of the first capacitor is electrically connected to the first power supply, and the negative electrode of the first capacitor is electrically connected to the ground electrode;

[0011] The first capacitor and the second capacitor are connected in parallel, and the second capacitor is electrically connected between the first power supply and the ground electrode.

[0012] Optionally, the push rod motor drive control circuit further comprises a control module, the control module comprising a first drive signal providing pin and a second drive signal providing pin; the drive signal providing module comprising a first drive signal providing unit and a second drive signal providing unit, the input pin comprising a first input pin and a second input pin;

[0013] The first drive signal providing unit comprises a first drive signal input port, a first resistor and a third capacitor; the first drive signal input port is electrically connected with the first input pin through the first resistor; a first end of the third capacitor is electrically connected between the first resistor and the first input pin, a second end of the third capacitor is electrically connected with a ground electrode, and the first drive signal providing pin is electrically connected with the first drive signal input port;

[0014] The second drive signal providing unit comprises a second drive signal input port, a second resistor and a fourth capacitor; the second drive signal input port is electrically connected with the second input pin through the second resistor; a first end of the fourth capacitor is electrically connected between the second resistor and the second input pin, a second end of the fourth capacitor is electrically connected with a ground electrode, and the second drive signal providing pin is electrically connected with the second drive signal input port.

[0015] Optionally, the current detection module comprises a voltage dividing unit, a second-order voltage dividing unit and an operational amplifier;

[0016] The GND pin is electrically connected with the non-inverting input terminal and the inverting input terminal of the operational amplifier through the voltage dividing unit; the inverting input terminal of the operational amplifier is also electrically connected with the output terminal of the second-order voltage dividing unit, and the output terminal of the operational amplifier is the output terminal of the current detection module and is electrically connected with the input terminal of the second-order voltage dividing unit.

[0017] Optionally, the voltage dividing unit comprises a fifth resistor, a sixth resistor and a seventh resistor;

[0018] A first end of the fifth resistor is electrically connected with the GND pin, and a second end of the fifth resistor is electrically connected with the ground electrode; a first end of the sixth resistor is electrically connected with the non-inverting input terminal of the operational amplifier, and a second end of the sixth resistor is electrically connected between the fifth resistor and the GND pin; a first end of the seventh resistor is electrically connected with the inverting input terminal of the operational amplifier, and a second end of the seventh resistor is electrically connected between the fifth resistor and the ground electrode.

[0019] Optionally, the second-order voltage dividing unit comprises an eighth resistor, a ninth resistor, a fifth capacitor and a sixth capacitor;

[0020] The eighth resistor is electrically connected between the inverting input terminal and the output terminal of the operational amplifier, and the eighth resistor and the fifth capacitor are connected in parallel; the ninth resistor is electrically connected between the inverting input terminal of the operational amplifier and the output terminal of the current detection module; the sixth capacitor is electrically connected between the output terminal of the current detection module and the ground electrode.

[0021] Optionally, the EMI filtering module includes a common-mode inductor, a common-mode suppression unit and a transient suppression unit;

[0022] The output pin includes a first output pin and a second output pin; the common mode inductor includes a first winding and a second winding;

[0023] The first end of the first winding is electrically connected to the first output pin, and the first end of the second winding is electrically connected to the second output pin; the second end of the first winding and the second end of the second winding are electrically connected to the motor connector through the common mode suppression unit and the transient suppression unit in sequence.

[0024] Optionally, the common-mode rejection unit includes a seventh capacitor, an eighth capacitor, and a ninth capacitor;

[0025] The second end of the first winding is electrically connected to the first end of the seventh capacitor, the second end of the second winding is electrically connected to the first end of the eighth capacitor, and the second end of the seventh capacitor and the second end of the eighth capacitor are both grounded;

[0026] A first end of the ninth capacitor is electrically connected to the second end of the first winding, and a second end of the ninth capacitor is electrically connected to the second end of the second winding.

[0027] Optionally, the transient suppression unit includes a first bidirectional transient suppression diode;

[0028] A first end of the first bidirectional suppression diode is electrically connected between the second end of the first winding and the motor connector, and a second end of the first bidirectional suppression diode is electrically connected between the second end of the second winding and the motor connector.

[0029] Optionally, the stroke detection module includes a tenth resistor, an eleventh resistor, a tenth capacitor, and a second bidirectional transient suppression diode; the motor connector includes a second pin and a third pin; the output pin includes: a first output pin and a second output pin;

[0030] The second pin is electrically connected to the output end of the stroke detection module through the tenth resistor and the eleventh resistor. The first end of the tenth resistor is electrically connected to the second power supply and the second pin respectively. The second end of the tenth resistor is electrically connected between the third pin and the first end of the eleventh resistor. The second end of the eleventh resistor is electrically connected to the output end of the stroke detection module. The first end of the second bidirectional transient suppression diode is electrically connected between the third pin and the first end of the eleventh resistor. The second end of the second bidirectional transient suppression diode is electrically connected to the ground electrode. The tenth capacitor and the bidirectional transient suppression diode are connected in parallel.

[0031] The technical solution of the present invention is to make the push rod motor drive control circuit include a driver chip, a voltage stabilizing module, a drive signal providing module, a current detection module, an EMI filtering module, a stroke detection module and a motor connector. The driver chip includes a voltage end pin, an input pin, an output pin and a GND pin. The first power supply is electrically connected to the voltage end pin through the voltage stabilizing module, the drive signal providing module is electrically connected to the input pin, the current detection module is electrically connected to the GND pin, and the output pin is electrically connected to the motor connector through the EMI filtering module. The motor connector is also electrically connected to the stroke detection module, so that the push rod motor control circuit can detect the current and stroke status of the push rod motor when driving the push rod motor to operate, so that when there is an abnormality such as overcurrent or stall, the output motor drive signal can be stopped in time, thereby achieving the purpose of safely controlling the operation of the motor. In addition, the push rod motor drive control circuit has a simple structure, so when it is applied to the push rod motor of an electric bed, it can improve the aesthetics and practicality of the electric bed.

[0032] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 The figure is a schematic structural diagram of a push rod motor drive control circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort should belong to the protection scope of the present application.

[0036] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] The embodiment provides a push rod motor driving control circuit. Figure 1 A structural schematic diagram of a push rod motor driving control circuit provided by the embodiment of the present application is shown in Figure 1 The push rod motor driving control circuit includes a driver chip 1, a voltage stabilizing module 2, a driving signal providing module 3, a current detecting module 4, an EMI filtering module 5, a stroke detecting module 6 and a motor connector 7. The driver chip 1 includes a voltage terminal pin VCC, an input pin IN, an output pin OUT and a GND pin. A first power supply V1 is electrically connected to the voltage terminal pin VCC through the voltage stabilizing module 2, the driving signal providing module 3 is electrically connected to the input pin IN, the current detecting module 4 is electrically connected to the GND pin, the output pin OUT is electrically connected to the motor connector 7 through the EMI filtering module 5, and the motor connector 7 is also electrically connected to the stroke detecting module 6.

[0038] The motor connector 7 is used for connecting a push rod motor. In an optional embodiment, the motor connector 7 can be a circular connector to realize electrical connection with the push rod motor. For example, the motor connector 7 is a DIN-504B-M10 circular connector produced by Haoyu Electronics Company.

[0039] The driver chip 1 is used to output motor driving signals to drive the push rod motor to operate. In the embodiment, the driver chip 1 can drive the push rod motor to operate according to the driving signals provided by the control module, and the type of the driver chip 1 is not limited in the embodiment. In an optional embodiment, the driver chip 1 is a TMI8140 motor driver produced by TOLMIC.

[0040] The first power supply V1 is electrically connected with the voltage terminal pin VCC through the voltage stabilizing module 2, wherein the first power supply V1 is used to provide voltage for the driver chip 1, and the voltage of the first power supply V1 is 24V for example. The voltage stabilizing module 2 is used to filter the noise signals of the first power supply V1, so that the driver chip 1 can access stable voltage through the voltage terminal pin VCC.

[0041] The driving signal providing module 3 is electrically connected with the input pin IN, wherein the driving signal providing module 3 is used to provide driving signals to the input pin IN of the driver chip 1, so that the driver chip 1 can generate motor driving signals according to the driving signals and output the motor driving signals to the motor connector 7 through the output pin OUT.

[0042] In an optional embodiment, the push rod motor driving control circuit further comprises a control module, and the control module is used to output driving signals to the driving signal providing module 3. For example, the driving signals are pulse width modulation signals.

[0043] In an optional embodiment, the control module can include but is not limited to an MCU (Microcontroller Unit).

[0044] In an optional embodiment, the control module further comprises a current sampling pin and a stroke sampling pin, and the control module is further used to adjust the output driving signals according to the input of the current sampling pin and the input of the stroke sampling pin.

[0045] The current detection module 4 is electrically connected with the GND pin, wherein the current detection module 4 is used to collect the current of the push rod motor and provide the sampled current to the current sampling pin of the control module, so that the control module can adjust the driving signals according to the sampled current.

[0046] The stroke detection module 6 is electrically connected with the motor connector 7, wherein the stroke detection module 6 is used to collect the stroke of the push rod motor and provide the sampled stroke to the stroke sampling pin of the control module, so that the control module can adjust the driving signals according to the sampled stroke.

[0047] Specifically, the control module outputs a driving signal to the driving signal providing module 3, the driving signal providing module 3 provides the driving signal to the driver chip 1, so that the driver chip 1 generates a motor driving signal according to the driving signal, and outputs the motor driving signal to the motor connector 7 through the output pin OUT after filtering by the EMI filtering module 5, so that the driver chip drives the operation of the push rod motor according to the driving signal. When the push rod motor operates, the current detection module 4 collects the current of the push rod motor and provides the sampled current to the current sampling pin of the control module, and the stroke detection module 6 samples the stroke of the push rod motor and provides the sampled stroke to the stroke sampling pin of the control module. The control module adjusts the driving signal according to the sampled current and / or the sampled stroke. For example, when the sampled current is abnormal, such as overcurrent, or the sampled stroke is abnormal, the control module stops outputting the driving signal. When the sampled current and the sampled stroke are not abnormal, the control module normally outputs the driving signal. In this way, the operation of the push rod motor can be safely controlled.

[0048] In this embodiment, by making the push rod motor driving control circuit include a driver chip, a voltage stabilizing module, a driving signal providing module, a current detection module, an EMI filtering module, a stroke detection module and a motor connector, the driver chip includes a voltage terminal pin, an input pin, an output pin and a GND pin, and the first power supply is electrically connected to the voltage terminal pin through the voltage stabilizing module, the driving signal providing module is electrically connected to the input pin, the current detection module is electrically connected to the GND pin, the output pin is electrically connected to the motor connector through the EMI filtering module, and the motor connector is also electrically connected to the stroke detection module. When the push rod motor driving control circuit drives the operation of the push rod motor, it can also detect the current state of the push rod motor, so that it can stop outputting the motor driving signal in time when there is an abnormality such as overcurrent or locked rotor, thereby achieving the purpose of safely controlling the operation of the motor. In addition, the push rod motor driving control circuit has a simple structure, so that when it is applied to the push rod motor of an electric bed, the appearance and practicability of the electric bed can be improved.

[0049] Optionally, continuing to refer to Figure 1 As shown, the voltage stabilizing module 2 includes a first capacitor C1, the positive electrode of the first capacitor C1 is electrically connected to the first power supply V1, and the negative electrode of the first capacitor C1 is electrically connected to the ground electrode, so that the first capacitor C1 can prevent the input voltage of the driver chip 1 from changing due to load changes, thereby making the input voltage of the driver chip 1 more stable. In an optional embodiment, the first capacitor C1 is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is 100 μF.

[0050] Optionally, continuing to refer to Figure 1As shown, the voltage stabilizing module 2 further comprises a second capacitor C2, the first capacitor C1 and the second capacitor C2 are connected in parallel, and the second capacitor C2 is electrically connected between the first power supply V1 and the ground electrode, so that the second capacitor C2 can effectively filter out high-frequency signals and pulse interference signals in the circuit. In an optional embodiment, the capacitance of the second capacitor C2 is 0.1 μF.

[0051] Optionally, continuing to refer to Figure 1 As shown, the control module comprises a first drive signal providing pin, the drive signal providing module 3 comprises a first drive signal providing unit, the input pin IN comprises a first input pin IN1, the first drive signal providing unit comprises a first drive signal input port 311, a first resistor R1 and a third capacitor C3, the first drive signal input port 311 is electrically connected to the first input pin IN1 through the first resistor R1, a first end of the third capacitor C3 is electrically connected between the first resistor R1 and the first input pin IN1, a second end of the third capacitor C3 is electrically connected to the ground electrode, and the first drive signal providing pin is electrically connected to the first drive signal input port 311, so that the first drive signal provided by the control module through the first drive signal providing pin can be filtered by the first resistor R1 and the third capacitor C3 of the first drive signal providing unit before being provided to the first input pin IN1, thereby ensuring good transmission of the first drive signal. In an exemplary embodiment, the resistance of the first resistor R1 is 1KΩ, and the capacitance of the third capacitor C3 is 10pF.

[0052] Optionally, continuing to refer to Figure 1 As shown, the control module further comprises a second drive signal providing pin; the drive signal providing module 3 further comprises a second drive signal providing unit, the input pin IN further comprises a second input pin IN2, the second drive signal providing unit comprises a second drive signal input port 321, a second resistor R2 and a fourth capacitor C4, the second drive signal input port 321 is electrically connected to the second input pin IN2 through the second resistor R2, a first end of the fourth capacitor C4 is electrically connected between the second resistor R2 and the second input pin IN2, a second end of the fourth capacitor C4 is electrically connected to the ground electrode, and the second drive signal providing pin is electrically connected to the second drive signal input port 321, so that the second drive signal provided by the control module through the second drive signal providing pin can be filtered by the second resistor R2 and the fourth capacitor C4 of the second drive signal providing unit before being provided to the second input pin IN2, thereby ensuring good transmission of the second drive signal. In an exemplary embodiment, the resistance of the second resistor R2 is 1KΩ, and the capacitance of the fourth capacitor C4 is 10pF.

[0053] Optionally, continuing to refer to Figure 1As shown, the current detection module 4 includes a voltage dividing unit 41, a second-order voltage dividing unit 42 and an operational amplifier 43, the GND pin is electrically connected to the non-inverting input terminal and the inverting input terminal of the operational amplifier 43 through the voltage dividing unit 41, the inverting input terminal of the operational amplifier 43 is also electrically connected to the output terminal of the second-order voltage dividing unit 42, and the output terminal of the operational amplifier 43 is the output terminal of the current detection module 4 and is electrically connected to the input terminal of the second-order voltage dividing unit 42.

[0054] The voltage dividing unit 41 includes a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, the first end of the fifth resistor R5 is electrically connected to the GND pin, the second end of the fifth resistor R5 is electrically connected to the ground electrode, the first end of the sixth resistor R6 is electrically connected to the non-inverting input terminal of the operational amplifier 43, the second end of the sixth resistor R6 is electrically connected between the fifth resistor R5 and the GND pin, the first end of the seventh resistor R7 is electrically connected to the inverting input terminal of the operational amplifier 43, and the second end of the seventh resistor R7 is electrically connected between the fifth resistor R5 and the ground electrode, thereby providing the operational amplifier 43 with a sampling voltage and a reference voltage.

[0055] The second-order voltage dividing unit 42 includes an eighth resistor R8, a ninth resistor R9, a fifth capacitor C5 and a sixth capacitor C6, the eighth resistor R8 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier 43, the eighth resistor R8 and the fifth capacitor C5 are connected in parallel, the ninth resistor R9 is electrically connected between the inverting input terminal of the operational amplifier 43 and the output terminal of the current detection module 4, and the sixth capacitor C6 is electrically connected between the output terminal of the current detection module 4 and the ground electrode, thereby being capable of reducing the interference on the sampling current.

[0056] It should be noted that the specific parameters of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the fifth capacitor C5 and the sixth capacitor C6 are determined according to design requirements, and the present embodiment does not make specific limitations thereon. For example, the resistance value of the fifth resistor R5 is 0.05Ω, the resistance values of the sixth resistor R6, the seventh resistor R7 and the ninth resistor R9 are 1KΩ, the resistance value of the eighth resistor R8 is 9.1KΩ, and the capacitance values of the fifth capacitor C5 and the sixth capacitor C6 are 100pF.

[0057] Optionally, continuing to refer to Figure 1As shown, the EMI filter module 5 includes a common-mode inductor 51, a common-mode suppression unit 52, and a transient suppression unit 53; the output pin OUT includes a first output pin OUT1 and a second output pin OUT2, the common-mode inductor 51 includes a first winding L11 and a second winding L12, the first end of the first winding L11 is electrically connected with the first output pin OUT1, the first end of the second winding L12 is electrically connected with the second output pin OUT2, the second end of the first winding L11 and the second end of the second winding L12 are electrically connected with the motor connector 7 through the common-mode suppression unit 52 and the transient suppression unit 53 in sequence.

[0058] The common-mode inductor 51 is used to suppress common-mode current in the circuit and enable differential-mode current to pass without attenuation. The common-mode inductor 51 includes a first winding L11 and a second winding L12. By electrically connecting the first end of the first winding L11 of the common-mode inductor 51 with the first output pin OUT1 of the driver chip 1 and electrically connecting the first end of the second winding L12 of the common-mode inductor 51 with the second output pin OUT2 of the driver chip 1, the common-mode inductor 51 can effectively suppress the interference signals present in the motor drive signal output by the driver chip 1. It should be noted that the parameter type of the common-mode inductor 51 can be determined according to design requirements, which is not limited in the embodiment. In an exemplary embodiment, the common-mode inductor 51 is YLM1008-102T common-mode inductor produced by Yijiaoyuan Company.

[0059] The common-mode suppression unit 52 is used to suppress interference signals between the output pin OUT of the driver chip 1 and the motor connector 7. In an exemplary embodiment, the common-mode suppression unit 52 includes a plurality of capacitors.

[0060] The transient suppression unit 53 is used to suppress transient overvoltage between the output pin of the driver chip 1 and the motor connector 7. In an exemplary embodiment, the transient suppression unit 53 includes at least one transient suppression diode.

[0061] Specifically, by making the EMI filter module 5 include a common-mode inductor 51, a common-mode suppression unit 52, and a transient suppression unit 53, the output pin OUT includes a first output pin OUT1 and a second output pin OUT2, the common-mode inductor 51 includes a first winding L11 and a second winding L12, the first end of the first winding L11 is electrically connected with the first output pin OUT1, the first end of the second winding L12 is electrically connected with the second output pin OUT2, the second end of the first winding L11 and the second end of the second winding L12 are electrically connected with the motor connector 7 through the common-mode suppression unit 52 and the transient suppression unit 53 in sequence, under the joint action of the common-mode inductor 51, the common-mode suppression unit 52, and the transient suppression unit 53, interference signals can be suppressed and transient large current can be absorbed, so that the push rod motor is not disturbed by high-frequency signals and transient large current, which is conducive to protecting the push rod motor.

[0062] Optional, continue to refer to Figure 1 As shown, the common-mode suppression unit 52 includes a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9. The second end of the first winding L11 is electrically connected to the first end of the seventh capacitor C7, the second end of the second winding L12 is electrically connected to the first end of the eighth capacitor C8, the second end of the seventh capacitor C7 and the second end of the eighth capacitor C8 are both grounded, the first end of the ninth capacitor C9 is electrically connected to the second end of the first winding L11, and the second end of the ninth capacitor C9 is electrically connected to the second end of the second winding L12, so that the seventh capacitor C7 can provide a low-impedance path for the second end of the first winding L11 and the first winding L12 can be connected. The common-mode interference signal output from the second end of L11 is short-circuited to the ground. At the same time, the eighth capacitor C8 can provide a low-impedance path for the second end of the second winding L12, and short-circuit the common-mode interference signal output from the second end of the second winding L12 to the ground, thereby achieving the purpose of suppressing the common-mode interference signal between the output pin OUT of the driver chip 1 and the motor connector 7, and enabling the ninth capacitor C9 to suppress the differential-mode interference between the second end of the first winding L11 and the second end of the second winding L12, thereby achieving the purpose of suppressing the differential-mode interference signal between the output pin OUT of the driver chip 1 and the motor connector 7.

[0063] It should be noted that the parameter types of the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 can be determined according to design requirements and are not specifically limited in this embodiment. In an exemplary embodiment, the capacitance of the seventh capacitor C7 and / or the eighth capacitor C8 is 100 pF, and the capacitance of the ninth capacitor C9 is 10 nF.

[0064] Optional, continue to refer to Figure 1 As shown, the transient suppression unit 53 includes a first bidirectional transient suppression diode D1, a first end of the first bidirectional suppression diode D1 is electrically connected between the second end of the first winding L11 and the motor connector, and a second end of the first bidirectional suppression diode D1 is electrically connected between the second end of the second winding L12 and the motor connector, so that the first bidirectional transient suppression diode D1 can absorb the transient high voltage between the second end of the first winding L11 and the second end of the second winding L12.

[0065] Optional, continue to refer to Figure 1As shown, the motor connector 7 includes a first pin a, a second pin b, a third pin c, a fourth pin d and a fifth pin e, the output pin OUT includes a first output pin OUT1 and a second output pin OUT2, the first pin a is electrically connected with the ground electrode, the second pin b is electrically connected with the second power supply V2, the second pin b and the third pin c are respectively electrically connected with two ends of the stroke detection module 6, and the fourth pin d and the fifth pin e are respectively electrically connected with the first output pin OUT and the second output pin OUT, so that the stroke detection module 6 can sample the stroke of the push rod motor.

[0066] For example, the second power supply V2 is 3.3V.

[0067] Optionally, the stroke detection module 6 includes a tenth resistor R10, an eleventh resistor R11, a tenth capacitor C10 and a second bidirectional transient suppression diode D2, the second pin b is electrically connected with the output end of the stroke detection module 6 through the tenth resistor R10 and the eleventh resistor R11, the first end of the tenth resistor R10 is electrically connected with the second power supply V2 and the second pin b respectively, the second end of the tenth resistor R10 is electrically connected between the third pin c and the first end of the eleventh resistor R11, and the second end of the eleventh resistor R11 is electrically connected with the output end of the stroke detection module; the first end of the second bidirectional transient suppression diode D2 is electrically connected between the third pin c and the first end of the eleventh resistor R11, the second end of the second bidirectional transient suppression diode D2 is electrically connected with the ground electrode, and the tenth capacitor C10 and the second bidirectional transient suppression diode D2 are connected in parallel.

[0068] The tenth resistor R10 is used for voltage division, and the eleventh resistor R11 is a protection resistor. The tenth capacitor C10 and the second bidirectional transient suppression diode D2 are used for filtering the sampling stroke of the stroke sampling module. It should be noted that the specific parameters of the tenth resistor R10, the eleventh resistor R11, the tenth capacitor C10 and the second bidirectional transient suppression diode D2 are determined according to design requirements, and this embodiment does not make specific limitations. In an exemplary embodiment, the resistance value of the tenth resistor R10 is 10KΩ, the resistance value of the eleventh resistor R11 is 1KΩ, and the capacitance value of the tenth capacitor C10 is 0.1μF.

[0069] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0070] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A push rod motor drive control circuit, characterized in that: include: Driver chip, voltage regulator module, drive signal providing module, current detection module, EMI filter module, stroke detection module and motor connector; The driver chip includes a voltage terminal pin, an input pin, an output pin and a GND pin; The first power supply is electrically connected to the voltage terminal pin through the voltage stabilizing module; the driving signal providing module is electrically connected to the input pin; and the current detection module is electrically connected to the GND pin. The output pin is electrically connected to the motor connector through the EMI filter module; the motor connector is also electrically connected to the stroke detection module.

2. The push rod motor drive control circuit according to claim 1, characterized in that: The voltage stabilizing module includes a first capacitor and a second capacitor; The positive electrode of the first capacitor is electrically connected to the first power supply, and the negative electrode of the first capacitor is electrically connected to the ground electrode; The first capacitor and the second capacitor are connected in parallel, and the second capacitor is electrically connected between the first power supply and the ground electrode.

3. The push rod motor drive control circuit according to claim 1, characterized in that: Also includes: A control module, the control module comprising a first drive signal providing pin and a second drive signal providing pin; The driving signal providing module includes: a first driving signal providing unit and a second driving signal providing unit, and the input pin includes: a first input pin and a second input pin; The first drive signal providing unit includes a first drive signal input port, a first resistor and a third capacitor; the first drive signal input port is electrically connected to the first input pin through the first resistor; the first end of the third capacitor is electrically connected between the first resistor and the first input pin, the second end of the third capacitor is electrically connected to the ground electrode, and the first drive signal providing pin is electrically connected to the first drive signal input port. The second drive signal providing unit includes a second drive signal input port, a second resistor and a fourth capacitor; the second drive signal input port is electrically connected to the second input pin through the second resistor; the first end of the fourth capacitor is electrically connected between the second resistor and the second input pin, the second end of the fourth capacitor is electrically connected to the ground electrode, and the second drive signal providing pin is electrically connected to the second drive signal input port.

4. The push rod motor drive control circuit according to claim 1, characterized in that: The current detection module includes: a voltage dividing unit, a second-order voltage dividing unit and an operational amplifier; The GND pin is electrically connected to the positive input and the inverting input of the operational amplifier through the voltage divider unit; the inverting input of the operational amplifier is also electrically connected to the output of the second-order voltage divider unit, and the output of the operational amplifier is the output of the current detection module and is electrically connected to the input of the second-order voltage divider unit.

5. The push rod motor drive control circuit according to claim 4, characterized in that: The voltage dividing unit includes a fifth resistor, a sixth resistor and a seventh resistor; The first end of the fifth resistor is electrically connected to the GND pin, and the second end of the fifth resistor is electrically connected to the ground electrode; the first end of the sixth resistor is electrically connected to the non-inverting input terminal of the operational amplifier, and the second end of the sixth resistor is electrically connected between the fifth resistor and the GND pin; the first end of the seventh resistor is electrically connected to the inverting input terminal of the operational amplifier, and the second end of the seventh resistor is electrically connected between the fifth resistor and the ground electrode.

6. The push rod motor drive control circuit according to claim 4, characterized in that: The second-order voltage dividing unit includes an eighth resistor, a ninth resistor, a fifth capacitor and a sixth capacitor; The eighth resistor is electrically connected between the inverting input terminal and the output terminal of the operational amplifier, and the eighth resistor and the fifth capacitor are connected in parallel; the ninth resistor is electrically connected between the inverting input terminal of the operational amplifier and the output terminal of the current detection module; the sixth capacitor is electrically connected between the output terminal of the current detection module and the ground electrode.

7. The push rod motor drive control circuit according to claim 1, characterized in that: The EMI filtering module includes a common mode inductor, a common mode suppression unit and a transient suppression unit; The output pin includes a first output pin and a second output pin; the common mode inductor includes a first winding and a second winding; The first end of the first winding is electrically connected to the first output pin, and the first end of the second winding is electrically connected to the second output pin; the second end of the first winding and the second end of the second winding are electrically connected to the motor connector through the common mode suppression unit and the transient suppression unit in sequence.

8. The push rod motor drive control circuit according to claim 7, characterized in that: The common mode rejection unit includes a seventh capacitor, an eighth capacitor and a ninth capacitor; The second end of the first winding is electrically connected to the first end of the seventh capacitor, the second end of the second winding is electrically connected to the first end of the eighth capacitor, and the second end of the seventh capacitor and the second end of the eighth capacitor are both grounded; A first end of the ninth capacitor is electrically connected to the second end of the first winding, and a second end of the ninth capacitor is electrically connected to the second end of the second winding.

9. The push rod motor drive control circuit according to claim 7, characterized in that: The transient suppression unit includes a first bidirectional transient suppression diode; A first end of the first bidirectional suppression diode is electrically connected between the second end of the first winding and the motor connector, and a second end of the first bidirectional suppression diode is electrically connected between the second end of the second winding and the motor connector.

10. The push rod motor drive control circuit according to claim 1, characterized in that: The stroke detection module includes a tenth resistor, an eleventh resistor, a tenth capacitor, and a second bidirectional transient suppression diode; the motor connector includes a second pin and a third pin; the output pin includes: a first output pin and a second output pin; The second pin is electrically connected to the output end of the stroke detection module through the tenth resistor and the eleventh resistor. The first end of the tenth resistor is electrically connected to the second power supply and the second pin respectively. The second end of the tenth resistor is electrically connected between the third pin and the first end of the eleventh resistor. The second end of the eleventh resistor is electrically connected to the output end of the stroke detection module. The first end of the second bidirectional transient suppression diode is electrically connected between the third pin and the first end of the eleventh resistor. The second end of the second bidirectional transient suppression diode is electrically connected to the ground electrode. The tenth capacitor and the bidirectional transient suppression diode are connected in parallel.

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