Novel target direct current motor drive circuit device

Abstract

The invention belongs to the technical field of electronic circuits, and particularly relates to a novel target direct current motor driving circuit device, which comprises a driving circuit, a protection circuit, a relay circuit, a feedback circuit and a motor, and is characterized in that the driving circuit outputs two paths of input signals and two paths of output signals, and the two paths of input signals are respectively forward rotation, reverse rotation and stop electric signals; the driving circuit outputs a driving signal to be connected to the relay circuit and is used for controlling on-off and reversing of a relay; an output signal of the protection circuit is connected to the relay circuit and is used for providing a power supply VV for controlling a relay; the relay circuit outputs a voltage signal to be connected to the motor and is used for controlling the motor to rotate and stop; the motor is connected to the feedback circuit and used for monitoring the working current of the motor. The problems that when a traditional target motor is started and braked, the target operation speed is too high, target control is not facilitated, and a limiting protection structure does not exist can be effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of electronic circuit technology, and specifically relates to a novel target DC motor drive circuit device. Background Technology

[0002] Target drive circuits are commonly used in target systems to control the movement and response of the target. This circuit typically consists of a controller, a driver, and sensors. The controller processes the information acquired by the sensors, generates appropriate drive signals, and finally, the driver applies the required force or movement to the target.

[0003] Currently, most DC motor drive circuits for targets on the market use relays to achieve motor rotation and commutation. Because the target runs too fast when the motor starts or brakes, it is not easy to control the target. The target is easily damaged by inertia when starting or braking, which can damage fasteners and the target itself. In addition, there is a lack of necessary current limiting protection, which can cause the relay contacts to stick together, leading to problems such as the target going out of control. Summary of the Invention

[0004] The purpose of this invention is to provide a novel target DC motor drive circuit device that can effectively solve problems such as excessive target speed during start-up and braking of traditional target motors, difficulty in controlling the target, and lack of limit protection structure.

[0005] The specific technical solution adopted by this invention is as follows:

[0006] A novel target DC motor drive circuit device includes a drive circuit, a protection circuit, a relay circuit, a feedback circuit, and a motor. The output of the drive circuit consists of two input signals and two output signals, and the two input signals are forward rotation, reverse rotation, and stop electrical signals, respectively.

[0007] The drive circuit outputs a drive signal that is connected to the relay circuit to control the relay's on / off state and commutation.

[0008] The protection circuit outputs a signal connected to the relay circuit to provide a control relay power supply VV.

[0009] The relay circuit outputs a voltage signal connected to the motor to control the motor to stop.

[0010] The motor is connected to a feedback circuit for monitoring the motor's operating current.

[0011] The driving circuit includes a driving chip U7 and a capacitor C17. Pin 1 of the driving chip U7 is connected to the MOZ_O forward rotation network connection, pin 2 of the driving chip U7 is connected to the MOF_O reverse rotation network connection, pin 16 of the driving chip U7 is connected to the MOZ_OUT network, and pin 15 of the driving chip U7 is connected to the MOF_OUT network.

[0012] The driver chip U79 pin and one end of capacitor C17 are connected to the VCC24 network to provide a power signal.

[0013] The protection circuit includes an optocoupler U16, a MOSFET Q2, resistors R60, R61, and R62, and a freewheeling diode D8. Pin 1 of the optocoupler U16 is connected to one end of resistor R60, pin 2 of the optocoupler U16 is connected to a PWM network, pin 3 of the optocoupler U16 is connected to one end of resistor R62, and pin 4 of the optocoupler U16 is connected to pin 1 of the MOSFET Q2 and one end of resistor R61.

[0014] One end of resistor R61, pin 3 of MOSFET Q2, and pin 2 of freewheeling diode D8 are connected to VCC24 network to provide a power signal. One end of resistor R60 is connected to VCC3.3 network.

[0015] The relay circuit includes a relay K1, a rectifier diode D2, a rectifier diode D3, a rectifier diode D6, and a rectifier diode D7. Pin 1 of the relay K1 is connected to an MOZ network, pin 2 of the relay K1 is connected to an MOF network, pin 3 of the relay K1 and pin 1 of the rectifier diode D2 are connected to an MO_OUT network, and pin 6 of the relay K1 and pin 1 of the rectifier diode D3 are connected to the MO_OUT network.

[0016] Pin 7 and pin 8 of relay K1 are connected to a VV network to provide a power signal.

[0017] Pin 4 and pin 5 of relay K1, pin 2 of rectifier diode D2, and pin 2 of rectifier diode D3 are connected to a VCC24 network to provide a power signal.

[0018] The feedback circuit includes operational amplifier U8, resistors R5, R6, R7, R8, and R9, and capacitors C3, C8, and C9. Pin 1 of operational amplifier U8 is connected to one end of resistor R7 and one end of resistor R5. Pin 2 of operational amplifier U8 is connected to one end of resistor R5 and one end of resistor R6. Pin 3 of operational amplifier U8 is connected to one end of resistor R8 and one end of capacitor C9. One end of resistor R7 and one end of capacitor C8 are connected to the CURRENT_MW network.

[0019] One end of resistor R9 and one end of resistor R8 are connected to the MW_GND network, and pin 8 of operational amplifier U8 and one end of capacitor C3 are connected to the VCC3.3V network to provide power signals.

[0020] The driver chip U7 has pin 8 and one end of capacitor C17 connected to the GND network to provide a ground signal.

[0021] One end of the resistor R62 is connected to the GND network to provide a ground signal.

[0022] Pin 1 of rectifier diode D6, pin 1 of rectifier diode D7, pin 9 of relay K1, and pin 10 of relay K1 are connected to the MW_GND network to provide a ground signal.

[0023] One end of resistor R9, one end of resistor R6, one end of capacitor C9, one end of capacitor C8, one end of capacitor C3, and pin 4 of operational amplifier U8 are connected to the GND network to provide a ground signal.

[0024] The technical effects achieved by this invention are as follows:

[0025] The present invention provides a novel target DC motor drive circuit device that effectively reduces the target's running speed during motor start-up and braking by adding a protection circuit, which is beneficial for target control. At the same time, it reduces the current flowing through the relay contacts, solving the problem of relay contacts sticking together.

[0026] The novel target DC motor drive circuit device of the present invention can effectively monitor the operating current of the target DC motor drive circuit device by adding a feedback circuit, so as to ensure the stability of the motor during operation; and by reducing speed and current, it can effectively ensure the reliability of the device and improve the service life of the device. Attached Figure Description

[0027] Figure 1 This is an overall system block diagram of an embodiment of the present invention;

[0028] Figure 2 This is a wiring diagram of the driving circuit according to an embodiment of the present invention;

[0029] Figure 3 This is a circuit diagram of the protection circuit according to an embodiment of the present invention;

[0030] Figure 4 This is a circuit diagram of the relay circuit according to an embodiment of the present invention;

[0031] Figure 5 This is a circuit diagram of the feedback circuit in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0033] like Figures 1-5 As shown, a novel target DC motor drive circuit device includes a drive circuit, a protection circuit, a relay circuit, a feedback circuit, and a motor. The output of the drive circuit consists of two input signals and two output signals, and the two input signals are forward rotation, reverse rotation, and stop electrical signals, respectively.

[0034] The drive circuit outputs a drive signal that is connected to the relay circuit to control the relay's on / off state and commutation.

[0035] The protection circuit output signal is connected to the relay circuit to provide the control relay power supply VV;

[0036] The relay circuit outputs a voltage signal connected to the motor to control the motor to stop.

[0037] The motor is connected to a feedback circuit to monitor the motor's operating current.

[0038] When the motor starts, the relay turns on first, the motor is powered on, and then the MOSFET turns on. The inrush current acts on the MOSFET, protecting the relay contacts from the impact of the large current. When the motor stops, the MOSFET turns off first, the motor is powered off, and then the relay turns on again. The inrush current acts on the MOSFET, protecting the relay contacts from the impact of the large current. By utilizing the time difference between the MOSFET's power-on and power-off, the motor's operating current is buffered, which helps to slow down the motor and is beneficial for controlling the target.

[0039] The driving circuit includes a driver chip U7 and a capacitor C17, which realizes the function of controlling the relay to flip at TTL level. The driver chip U7 is ULN2003. Pin 1 of the driver chip U7 is connected to the MOZ_O forward rotation network, pin 2 of the driver chip U7 is connected to the MOF_O reverse rotation network, pin 16 of the driver chip U7 is connected to the MOZ_OUT network, and pin 15 of the driver chip U7 is connected to the MOF_OUT network.

[0040] The driver chip U79 pin and one end of capacitor C17 are connected to the VCC24 network to provide a power signal.

[0041] The protection circuit includes optocoupler U16, MOSFET Q2, resistors R60, R61, R62, and freewheeling diode D8. Optocoupler U16 is a TLP2301, MOSFET Q2 is an IRF4905, pin 1 of optocoupler U16 is connected to one end of resistor R60, pin 2 of optocoupler U16 is connected to a PWM network, pin 3 of optocoupler U16 is connected to one end of resistor R62, and pin 4 of optocoupler U16 is connected to pin 1 of MOSFET Q2 and one end of resistor R61.

[0042] One end of resistor R61, pin 3 of MOSFET Q2, and pin 2 of freewheeling diode D8 are connected to the VCC24 network to provide a power signal. One end of resistor R60 is connected to the VCC3.3 network.

[0043] By adding a protection circuit, the running speed of the target is effectively reduced when the motor starts and brakes, which is beneficial for controlling the target. At the same time, the current flowing through the relay contacts is reduced, which solves the problem of relay contacts sticking together.

[0044] The relay circuit includes relay K1, rectifier diodes D2, D3, D6, and D7. Pin 1 of relay K1 is connected to the MOZ network, pin 2 of relay K1 is connected to the MOF network, pin 3 of relay K1 and pin 1 of rectifier diode D2 are connected to the MO_OUT network, and pin 6 of relay K1 and pin 1 of rectifier diode D3 are connected to the MO_OUT network.

[0045] It can realize the motor reversing function, and the relay K1 is a Songchuan brand 103T-1CH-C-DC24V-20A;

[0046] Pin 7 and pin 8 of relay K1 are connected to a VV network to provide power signals.

[0047] Pins 4 and 5 of relay K1, pin 2 of rectifier diode D2, and pin 2 of rectifier diode D3 are connected to a VCC24 network to provide a power signal.

[0048] The feedback circuit includes operational amplifier U8, resistors R5, R6, R7, R8, and R9, and capacitors C3, C8, and C9. Pin 1 of operational amplifier U8 is connected to one end of resistor R7 and one end of resistor R5; pin 2 of operational amplifier U8 is connected to one end of resistor R5 and one end of resistor R6; and pin 3 of operational amplifier U8 is connected to one end of resistor R8 and one end of capacitor C9. One end of resistor R7 and one end of capacitor C8 are connected to the CURRENT_MW network. This circuit enables current detection. The operational amplifier U8 used is an MCP6L02T-E.

[0049] One end of resistor R9 and one end of resistor R8 are connected to the MW_GND network. Pin 8 of op-amp U8 and one end of capacitor C3 are connected to the VCC3.3V network to provide power signals.

[0050] By adding a feedback circuit, the operating current of the target DC motor drive circuit can be effectively monitored, ensuring the stability of the motor during operation; and by reducing speed and current, the reliability of the device can be effectively guaranteed and the service life of the device can be extended.

[0051] The driver chip U7 has pin 8 and one end of capacitor C17 connected to the GND network to provide a ground signal.

[0052] One end of resistor R62 is connected to the GND network to provide a ground signal.

[0053] Pin 1 of rectifier diode D6, pin 1 of rectifier diode D7, pin 9 of relay K1, and pin 10 of relay K1 are connected to the MW_GND network to provide a ground signal.

[0054] One end of resistor R9, one end of resistor R6, one end of capacitor C9, one end of capacitor C8, one end of capacitor C3, and pin 4 of op-amp U8 are connected to the GND network to provide a ground signal.

[0055] The working principle of this invention is as follows: when the motor is about to rotate forward, relay K1 is driven first, and after a delay of 100ms, MOSFET Q2 is driven; when the motor needs to stop, MOSFET Q2 is turned off first, and after a delay of 100ms, relay K1 is turned off.

[0056] When the motor is about to reverse, relay K1 is driven first, and MOSFET Q2 is driven after a delay of 100ms; when the motor needs to stop, MOSFET Q2 is turned off first, and relay K1 is turned off after a delay of 100ms.

[0057] During the forward rotation of the motor: Pin 1 (MOZ_O) of the driver chip U7 is at a high level, and Pin 2 (MOF_O) of the driver chip U7 is at a low level. After being driven in reverse by the driver chip U7, Pin 16 of the driver chip U7 is at a low level, Pin 15 of the driver chip U7 is at a high level, and Pin 1 of the relay K1 is at a low level. Pins 1 and 7 of the relay K1 contacts are closed. At this time, there is no current surge on the relay K1 contacts. After a delay of 100ms, when the PWM signal is applied to Pin 2 of the input terminal of the optocoupler U16, Pin 4 of the output terminal of the optocoupler U16 is at a low level, triggering the MOSFET Q2 to conduct. The network VV is energized. Since the relay K1 contacts were closed before, the surge current generated at this time acts on the MOSFET Q2, and the motor rotates in the forward direction, protecting the relay K1 contacts. When the motor needs to stop, the PWM signal is high at pin 2 of the optocoupler U16, and pin 4 of the optocoupler U16 is also high. MOSFET Q2 is cut off, and the VV network is de-energized. Since the relay K1 contact is already closed, the resulting surge current acts on MOSFET Q2, stopping the motor. After a 100ms delay, pin 1 (MOZ_O) of driver chip U7 goes low, and pin 2 (MOF_O) goes low. After being reverse-driven by driver chip U7, pin 16 and pin 15 of driver chip U7 go high, opening the contacts of relay K1 (pins 1 and 7), stopping the motor, and protecting the relay K1 contact.

[0058] Motor reversal process: Pin 1 (MOZ_O) of driver chip U7 is low, and pin 2 (MOF_O) of driver chip U7 is high. After being reverse-driven by driver chip U7, pin 16 of driver chip U7 is high, pin 15 of driver chip U7 is low, and pin 2 of relay K1 is low. The contacts of relay K1, pins 2 and 8, are closed. At this time, there is no current surge on the contacts of relay K1. After a delay of 100ms, when the PWM signal is applied to the input pin 2 of optocoupler U16, the output pin 4 of optocoupler U16 is low, triggering MOSFET Q2 to conduct. Network VV is energized. Since the contacts of relay K1 have already been closed, the resulting surge current acts on MOSFET Q2, causing the motor to rotate in reverse. When the motor needs to stop, the PWM signal is high at pin 2 of the optocoupler U16, and pin 4 of the optocoupler U16 is also high. MOSFET Q2 is cut off, and the VV network is de-energized. Since the relay K1 contact is already closed, the resulting surge current acts on MOSFET Q2, stopping the motor. After a 100ms delay, pin 1 (MOZ_O) of driver chip U7 goes low, and pin 2 (MOF_O) goes low. After being reverse-driven by driver chip U7, pin 16 and pin 15 of driver chip U7 go high, opening the circuit at pins 2 and 8 of relay K1, stopping the motor and protecting the relay K1 contact.

[0059] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A novel target DC motor drive circuit arrangement, characterized by: It includes a drive circuit, a protection circuit, a relay circuit, a feedback circuit, and a motor. The output of the drive circuit consists of two input signals and two output signals. The two input signals are forward rotation, reverse rotation, and stop electrical signals, respectively. The drive circuit outputs a drive signal that is connected to the relay circuit to control the relay's on / off state and commutation. The protection circuit outputs a signal connected to the relay circuit to provide a control relay power supply VV. The relay circuit outputs a voltage signal connected to the motor to control the motor to stop. The motor is connected to a feedback circuit for monitoring the motor's operating current.

2. A novel target DC motor drive circuit arrangement as claimed in claim 1, characterized in that: The driving circuit includes a driving chip U7 and a capacitor C17. Pin 1 of the driving chip U7 is connected to the MOZ_O forward rotation network connection, pin 2 of the driving chip U7 is connected to the MOF_O reverse rotation network connection, pin 16 of the driving chip U7 is connected to the MOZ_OUT network, and pin 15 of the driving chip U7 is connected to the MOF_OUT network. The driver chip U79 pin and one end of capacitor C17 are connected to the VCC24 network to provide a power signal.

3. The novel target DC motor drive circuit device according to claim 1, characterized in that: The protection circuit includes an optocoupler U16, a MOSFET Q2, resistors R60, R61, and R62, and a freewheeling diode D8. Pin 1 of the optocoupler U16 is connected to one end of resistor R60, pin 2 of the optocoupler U16 is connected to a PWM network, pin 3 of the optocoupler U16 is connected to one end of resistor R62, and pin 4 of the optocoupler U16 is connected to pin 1 of the MOSFET Q2 and one end of resistor R61. One end of resistor R61, pin 3 of MOSFET Q2, and pin 2 of freewheeling diode D8 are connected to VCC24 network to provide a power signal. One end of resistor R60 is connected to VCC3.3 network.

4. The novel target DC motor drive circuit device according to claim 1, characterized in that: The relay circuit includes a relay K1, a rectifier diode D2, a rectifier diode D3, a rectifier diode D6, and a rectifier diode D7. Pin 1 of the relay K1 is connected to an MOZ network, pin 2 of the relay K1 is connected to an MOF network, pin 3 of the relay K1 and pin 1 of the rectifier diode D2 are connected to an MO_OUT network, and pin 6 of the relay K1 and pin 1 of the rectifier diode D3 are connected to the MO_OUT network. Pin 7 and pin 8 of relay K1 are connected to a VV network to provide a power signal. Pin 4 and pin 5 of relay K1, pin 2 of rectifier diode D2, and pin 2 of rectifier diode D3 are connected to a VCC24 network to provide a power signal.

5. The novel target DC motor drive circuit device according to claim 1, characterized in that: The feedback circuit includes operational amplifier U8, resistors R5, R6, R7, R8, and R9, and capacitors C3, C8, and C9. Pin 1 of operational amplifier U8 is connected to one end of resistor R7 and one end of resistor R5. Pin 2 of operational amplifier U8 is connected to one end of resistor R5 and one end of resistor R6. Pin 3 of operational amplifier U8 is connected to one end of resistor R8 and one end of capacitor C9. One end of resistor R7 and one end of capacitor C8 are connected to the CURRENT_MW network. One end of resistor R9 and one end of resistor R8 are connected to the MW_GND network, and pin 8 of operational amplifier U8 and one end of capacitor C3 are connected to the VCC3.3V network to provide power signals.

6. The novel target DC motor drive circuit device according to claim 2, characterized in that: The driver chip U7 has pin 8 and one end of capacitor C17 connected to the GND network to provide a ground signal.

7. The novel target DC motor drive circuit device according to claim 3, characterized in that: One end of the resistor R62 is connected to the GND network to provide a ground signal.

8. The novel target DC motor drive circuit device according to claim 4, characterized in that: Pin 1 of rectifier diode D6, pin 1 of rectifier diode D7, pin 9 of relay K1, and pin 10 of relay K1 are connected to the MW_GND network to provide a ground signal.

9. A novel target DC motor drive circuit device according to claim 5, characterized in that: One end of resistor R9, one end of resistor R6, one end of capacitor C9, one end of capacitor C8, one end of capacitor C3, and pin 4 of operational amplifier U8 are connected to the GND network to provide a ground signal.

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