Push rod motor control circuit

Abstract

The utility model relates to a push rod motor, especially to a push rod motor control circuit used in the push rod motor control of a new electric folding vehicle. A push rod motor control circuit, including the drive Q3 MOS pipe control end MOTOR, clockwise rotation control end CW, counterclockwise rotation control end CCW of push rod motor, and all are controlled by singlechip, MOTOR control end is connected with the 6th triode base electrode electricity after the series connection 26th resistance, the 6th triode collector and N channel MOS pipe grid electrode electricity are connected, the 6th triode emitter and power supply ground electricity are connected, the N channel MOS pipe source electrode is connected with power supply ground electricity after the series connection 5th resistance, the N channel MOS pipe drain electrode is connected with the always open contact of the 3rd relay and the 4th relay respectively, the always close contact of the 3rd relay and the 4th relay is connected with power supply voltage +24V electricity. Prevent the very big electric arc of relay contact switching, avoid the burning damage of relay contact.

Description

Technical Field

[0001] This utility model relates to a push rod motor, and more particularly to a push rod motor control circuit used in the push rod motor control of a new type of electric folding bicycle. Background Technology

[0002] Actuator motors are widely used in automation control across various industries. They output power through a motor, which, after deceleration, drives a actuator to extend or retract, achieving lifting or pushing effects. This allows the electrically driven actuator motor to push or pull target components or devices, and provides a certain degree of stroke control. The motion control of the actuator motor relies heavily on its control circuit. Current actuator motor controls typically use relay contacts to switch the actuator's operating state and direction. However, in existing control circuits, especially in newer electric folding bicycle actuator motors, the relay contacts generate a large electric arc during switching, creating a sudden surge of current. This can easily burn and damage the relay contacts, reducing their lifespan and hindering the proper functioning and lifespan of the actuator motor. Utility Model Content

[0003] This invention addresses the problem in existing electric folding bicycle push rod motor control circuits where large electric arcs are generated during relay contact switching, creating instantaneous high currents that easily burn and damage the relay contacts, thus affecting and reducing the relay's lifespan and making it difficult to effectively guarantee the normal operating quality and lifespan of the push rod motor. It provides a push rod motor control circuit that effectively prevents large electric arcs during relay contact switching, better avoids relay contact burning and damage, improves relay lifespan, enhances the reliability of the push rod motor, and improves the normal operating quality and lifespan of the push rod motor.

[0004] The specific technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a push rod motor control circuit, including a drive Q3 MOS transistor control terminal MOTOR, a clockwise rotation control terminal CW, and a counterclockwise rotation control terminal CCW, all of which are controlled by a microcontroller. The MOTOR control terminal is connected to the base of the 6th transistor after being connected in series with a resistor of the 26th series. The collector of the 6th transistor is connected to the gate of the N-channel MOS transistor. The emitter of the 6th transistor is connected to the power supply ground. The source of the N-channel MOS transistor is connected to the power supply ground after being connected in series with a resistor of the 5th series. The drain of the N-channel MOS transistor is connected to the normally open contacts of the 3rd and 4th relays respectively. All closed contacts are electrically connected to the +24V power supply. The common contact of the 3rd and 4th relays is electrically connected to the negative and positive terminals of the motor connector CN, respectively. One end of the relay coil of the 3rd relay is electrically connected to the +24V power supply, and the other end is electrically connected to the collector of the 5th transistor. The base of the 5th transistor, connected in series with resistor 13, is electrically connected to the counterclockwise rotation control terminal CCW. One end of the relay coil of the 4th relay is electrically connected to the +24V power supply, and the other end is electrically connected to the collector of the 2nd transistor. The base of the 2nd transistor, connected in series with resistor 22, is electrically connected to the clockwise rotation control terminal CW. The emitters of both the 2nd and 5th transistors are electrically connected to ground. This design effectively prevents large electric arcs during relay contact switching, better avoids burn-out damage to the relay contacts, improves relay lifespan, enhances the reliability of the push rod motor, and improves the normal operating quality and lifespan of the push rod motor. The 3rd and 4th relays are conventional coil-operated relays.

[0005] Preferably, a transient voltage suppressor diode (TVS) is connected in parallel between the drain of the N-channel MOSFET and the power supply ground. The cathodes of the TVS are electrically connected to the normally open contacts of the third and fourth relays, and the anodes are electrically connected to the power supply ground. This improves the effectiveness of instantaneous overvoltage protection for the N-channel MOSFET and related circuits, and enhances the safety protection against damage to components in the circuit from instantaneous surge voltage pulses.

[0006] Preferably, an eighth diode is connected in series between the drain of the N-channel MOSFET and the +24V power supply voltage. The anode of the eighth diode is electrically connected to the drain of the N-channel MOSFET, and the cathode of the eighth diode is electrically connected to the +24V power supply voltage. By setting up the D8 diode, a freewheeling and clamping function is achieved, protecting the Q3 MOSFET and preventing high-voltage breakdown damage to the Q3 MOSFET.

[0007] Preferably, a second diode is connected in parallel across the relay coil of the third relay, and the anode of the second diode is electrically connected to the collector of the fifth transistor.

[0008] Preferably, a third diode is connected in parallel across the relay coil of the fourth relay, and the anode of the third diode is electrically connected to the collector of the second transistor.

[0009] Preferably, the microcontroller is an STM8S003F3P6 MCU chip.

[0010] Preferably, the N-channel MOSFET is of model NCE7560K.

[0011] Preferably, a 24th resistor is electrically connected in parallel between the gate and source of the N-channel MOS transistor.

[0012] The beneficial effects of this utility model are: it can effectively prevent large electric arcs from being generated when the relay contacts switch, better avoid the phenomenon of burning damage to the relay contacts, improve the service life of the relay, improve the reliability of the push rod motor, and improve the normal use quality and service life of the push rod motor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the control circuit of this utility model.

[0014] Figure 2 This is a schematic diagram showing the connection between the N-channel MOSFET of this utility model and the third and fourth relays.

[0015] Figure 3 This is the control principle logic diagram of this utility model. Detailed Implementation

[0016] Depend on Figures 1 to 3As shown, a push rod motor control circuit includes a drive Q3 MOS transistor control terminal MOTOR, a clockwise rotation control terminal CW, and a counterclockwise rotation control terminal CCW, all controlled by a microcontroller. The MOTOR control terminal is connected in series with resistor R26 and then electrically connected to the base of transistor Q6. The collector of transistor Q6 is electrically connected to the gate of N-channel MOS transistor Q3. The emitter of transistor Q6 is connected to power ground GND. The source of transistor Q3 is connected to ground via a series resistor R5. Terminal I_AD1 is connected to the source of the N-channel MOSFET. The drain of the N-channel MOSFET is connected to the normally open contacts (K3-2, K4-2) of the 3rd and 4th relays, respectively. The normally closed contacts (K3-3, K4-3) of the 3rd and 4th relays K3 are both connected to the +24V power supply. The common contact terminals (K3-1, K4-1) of the 3rd and 4th relays are connected to the power supply. The relays K2 and K4 are respectively connected to the negative terminal CN2-1 and positive terminal CN2-2 of the motor connector CN2. Both relays K3 and K4 are conventional pull-in relays in the circuit control. One end (K3-5) of the relay coil of relay K3 is connected to the +24V power supply, and the other end (K3-4) of the relay coil is connected to the collector of transistor Q5. The base of transistor Q5 is connected in series with resistor 13. R13 is electrically connected to the counter-clockwise rotation control terminal CCW; one end of the relay coil of the fourth relay K4 (K4-4) is electrically connected to the power supply voltage +24V, and the other end of the relay coil of the fourth relay K4 (K4-5) is electrically connected to the collector of the second transistor R2. The base of the second transistor R2 is connected in series with resistor R22 and then electrically connected to the clockwise rotation control terminal CW. The emitters of the second transistor Q2 and the fifth transistor Q5 are both connected to the power supply ground GND. A transient voltage suppressor diode TVS is connected in parallel between the drain of the N-channel MOSFET Q3 and the power supply ground. The cathodes of the transient voltage suppressor diode TVS are electrically connected to the normally open contacts (K3-2, K4-2) of the third relay K3 and the fourth relay K4, and the anode of the transient voltage suppressor diode TVS is electrically connected to the power supply ground. Resistor R24 ​​is connected in parallel between the gate and source of the N-channel MOSFET Q3. A diode D8 is connected in series between the drain of N-channel MOSFET Q3 and the +24V power supply. The anode of diode D8 is electrically connected to the drain of N-channel MOSFET Q3, and the cathode of diode D8 is electrically connected to the +24V power supply. A diode D2 is connected in parallel across the relay coil of the third relay K3. The anode of diode D2 is electrically connected to the collector of the fifth transistor Q5. A diode D3 is connected in parallel across the relay coil of the fourth relay K4. The anode of diode D3 is electrically connected to the collector of the second transistor Q2. The microcontroller used is an STM8S003F3P6 MCU chip. The N-channel MOSFET Q3 is an NCE7560K.

[0017] The control principle of this linear actuator motor control circuit is as follows: MOTOR, CW (motor clockwise rotation), CCW (motor counterclockwise rotation), and I_AD1 are all controlled by a microcontroller (MCU: STM8S003F3P6). MOTOR, through resistor R26 (number 26) and transistor Q6 (number 6), triggers the fast drive MOSFET Q3 (model NCE7560K), switching pins 2 of relay K3 and K4 to the negative terminal. The motor connector CN2 is the interface for the linear actuator motor; pins 2 of CN2 are connected to pins 1 of relay K3 (number 3) and K4 (number 4). A transient voltage suppression diode (TVS), a bidirectional voltage regulation and bidirectional negative resistance overvoltage protection device, similar to a varistor, is used to suppress instantaneous overvoltages. When a surge voltage occurs instantaneously in the protected circuit, the bidirectional breakdown diode can quickly break down through Zener diodes, changing from a high-resistance state to a low-resistance state, thereby shunting and clamping the surge voltage and protecting the components in the circuit from damage by the instantaneous surge voltage.

[0018] In standby mode, pin 1 of the third relay K3 is connected to 24V voltage and is connected to pin 1 of the motor connector CN2. Pin 1 of the fourth relay K4 is connected to 24V and is connected to pin 2 of the motor connector CN2. The motor connector CN2 is connected to both ends of the motor. Because there is no voltage difference between the two ends of the push rod motor, the push rod motor does not work.

[0019] Forward rotation working principle: First, the MOTOR is set to low level to disconnect the Q3 MOS transistor, CCW is set to high level, and CW is set to low level. Pin 4 of the third relay K3 is connected to the negative terminal, energizing the internal coil of the third relay K3. After pin 1 of the third relay K3 is connected to pin 2, the MOTOR is set to high level to turn on the Q3 MOS transistor. Pin 1 of the third relay K3 is connected to the negative terminal, and the fourth relay K4 is not energized. Finally, pin 1 of CN2 (motor end) is connected to the negative terminal, and pin 2 of CN2 is connected to the positive terminal, and the push rod motor starts to rotate forward. Pins 18, 19, and 20 of the microcontroller (STM8S003F3P6) are connected to the MOTOR, CW, and CCW respectively, all in push-free output mode. The MOTOR is set to low level by pin 18 of the microcontroller (STM8S003F3P6).

[0020] Reverse operation principle: First, set the motor to low level to disconnect the Q3 MOS transistor. Rotate the control terminal CCW counterclockwise to set it to low level, and rotate the control terminal CW clockwise to set it to high level. Connect pin 5 of the fourth relay K4 to the negative terminal, energize the internal coil of the fourth relay K4, and connect pin 1 of the fourth relay K4 to pin 2. Then, set the motor to high level to turn on the Q3 MOS transistor. Connect pin 1 of the fourth relay K4 to the negative terminal. The third relay K3 is not energized. Finally, connect pin 1 of CN2 (motor end) to the positive terminal and pin 2 of CN2 to the negative terminal. The push rod motor starts to reverse.

[0021] Compared to other drive circuits, this push rod motor drive scheme has the advantages of high reliability and zero-current switching of the relay contacts, preventing large electric arcs during relay contact switching, which would quickly damage the contacts under high current conditions. This design increases the lifespan of the relay and improves the quality and service life of the controller.

[0022] The above content and structure describe the basic principles, main features, and advantages of this utility model, which should be understood by those skilled in the art. The examples and descriptions above are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A linear actuator motor control circuit, comprising a drive Q3 MOS transistor control terminal MOTOR, a clockwise rotation control terminal CW, and a counterclockwise rotation control terminal CCW, all controlled by a microcontroller, characterized in that: The MOTOR control terminal is connected in series with resistor 26 and then electrically connected to the base of transistor 6. The collector of transistor 6 is electrically connected to the gate of N-channel MOSFET. The emitter of transistor 6 is electrically connected to power ground. The source of N-channel MOSFET is connected in series with resistor 5 and then electrically connected to power ground. The drain of N-channel MOSFET is electrically connected to the normally open contacts of relays 3 and 4, respectively. The normally closed contacts of relays 3 and 4 are both electrically connected to the +24V power supply. The common contact of relays 3 and 4 is connected to the negative terminal of the motor connector. The positive and negative terminals are electrically connected; one end of the relay coil of the third relay is electrically connected to the power supply voltage +24V, and the other end is electrically connected to the collector of the fifth transistor. The base of the fifth transistor is connected in series with the 13th resistor and then electrically connected to the counterclockwise rotation control terminal CCW; one end of the relay coil of the fourth relay is electrically connected to the power supply voltage +24V, and the other end is electrically connected to the collector of the second transistor. The base of the second transistor is connected in series with the 22nd resistor and then electrically connected to the clockwise rotation control terminal CW. The emitters of both the second and fifth transistors are electrically connected to the power supply ground.

2. The push rod motor control circuit according to claim 1, characterized in that: A transient voltage suppressor diode (TVS) is connected in parallel between the drain of the N-channel MOSFET and the power supply ground. The cathodes of the TVS are electrically connected to the normally open contacts of the third and fourth relays, and the anodes of the TVS are electrically connected to the power supply ground.

3. The push rod motor control circuit according to claim 1 or 2, characterized in that: An eighth diode is connected in series between the drain of the N-channel MOSFET and the power supply voltage +24V. The anode of the eighth diode is electrically connected to the drain of the N-channel MOSFET, and the cathode of the eighth diode is electrically connected to the power supply voltage +24V.

4. The push rod motor control circuit according to claim 1, characterized in that: The second diode is connected in parallel across the relay coil of the third relay, and the anode of the second diode is electrically connected to the collector of the fifth transistor.

5. The push rod motor control circuit according to claim 1, characterized in that: The relay coil of the fourth relay is connected in parallel with the third diode, and the anode of the third diode is electrically connected to the collector of the second transistor.

6. The push rod motor control circuit according to claim 1, characterized in that: The microcontroller used is an STM8S003F3P6 MCU chip.

7. The push rod motor control circuit according to claim 1, characterized in that: The N-channel MOSFET used is model NCE7560K.

8. The push rod motor control circuit according to claim 1, characterized in that: The N-channel MOS transistor has a 24th resistor connected in parallel between its gate and source.

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