HKT thyristor vehicle control signal conversion circuit

Abstract

This utility model discloses an HKT thyristor-based vehicle control signal conversion circuit in the field of vehicle control technology. It includes a signal input terminal JP1, which is connected to a rectifier unit. The rectifier unit is connected to an isolation unit, and the isolation unit is connected to an electronic switch. By replacing the relay conversion circuit with an electronic signal conversion circuit, the rectifier unit converts the AC signal into a DC signal, the isolation unit isolates the signal, and finally, the electronic switch transmits the logic signal to the microcontroller, thereby achieving vehicle start / stop control. This avoids the mechanical fatigue problem of relays and extends the overall service life of the circuit.

Description

Technical Field

[0001] This utility model relates to the HKT thyristor-based vehicle control signal conversion circuit in the field of vehicle control technology. Background Technology

[0002] Thyristors, as switching actuators, have a wide range of applications, including reactive power compensation and motor control, such as crane start-stop. The external control signal for the crane is AC 220V. Current technology uses small signal relays to isolate and transmit logic signals (such as...). Figure 3-4 The logic signal is input to the microcontroller, which controls the switching of the thyristor based on the converted high and low levels, thereby controlling the start and stop (forward and reverse) of the motor. However, when the crane is operated extremely frequently, operational malfunctions may occur. After testing, it was found that the relay was not engaging properly. This is because the frequent engagement of the relay caused mechanical fatigue and performance degradation. Utility Model Content

[0003] The purpose of this invention is to provide an HKT thyristor-based crane control signal conversion circuit, which solves the problem of relay mechanical fatigue and extends the service life of the circuit.

[0004] To achieve the above objectives, this utility model provides an HKT thyristor-based vehicle control signal conversion circuit, including a signal input terminal JP1, which is connected to a rectifier unit, an isolation unit, and an electronic switch.

[0005] Compared with the prior art, the beneficial effects of this utility model are that it replaces the relay conversion circuit with an electronic signal conversion circuit, uses a rectifier unit to convert AC signals into DC signals, uses an isolation unit for isolation, and finally uses an electronic switch to transmit logic signals, which are then transmitted to a microcontroller to realize the start and stop control of the vehicle; it avoids the problem of mechanical fatigue of relays and extends the overall service life of the circuit.

[0006] As a further improvement of this utility model, the rectifier unit includes a capacitor C1. One end of the capacitor C1 is connected to one end of the resistor R1 and the signal input terminal JP1. The other end of the resistor R1 is connected to pin 2 of the rectifier bridge B1. The neutral line AC-N is connected to the other end of the capacitor C1 and pin 1 of the rectifier bridge B1. Pin 3 of the rectifier bridge B1 is connected to the cathode of the Zener diode Z1. The anode of the diode Z1 is connected to the isolation unit. Pin 4 of the rectifier bridge B1 is connected to the isolation unit.

[0007] In this way, the signal input terminal JP1 outputs an AC voltage of 220V. This voltage signal is then sent to the rectifier bridge B1 after being current-limited and voltage-divided by the resistor R1. After being rectified by the rectifier bridge B1, a DC signal is output.

[0008] As a further improvement of this utility model, the isolation unit includes an optocoupler D1. Pin 1 of the optocoupler D1 is connected to the anode of the Zener diode Z1, pin 2 of the optocoupler D1 is connected to pin 4 of the rectifier bridge B1, and pins 3 and 4 of the optocoupler D1 are connected to an electronic switch.

[0009] In this way, the DC signal output by rectifier bridge B1 is divided by Zener diode Z1 and applied to optocoupler D1, thereby turning on optocoupler D1. If rectifier bridge B1 has no output DC signal, optocoupler D1 is turned off, thus achieving circuit isolation.

[0010] As a further improvement of this utility model, the electronic switch includes a resistor R7. One end of the resistor R7 is connected to pin 3 of the optocoupler D1, and the other end of the resistor R7 is connected to the power supply VCC and one end of the resistor R9. The other end of the resistor R9 is connected to the anode of the light-emitting diode L1. The cathode of the light-emitting diode L1 is connected to the collector of the transistor N1. Pin 4 of the optocoupler D1 is connected to one end of the resistor R8, the positive terminal of the capacitor C7, and the base of the transistor N1. The other end of the resistor R8, the negative terminal of the capacitor C7, and the emitter of the transistor N1 are all connected to ground.

[0011] When the optocoupler is turned on, the power supply voltage VCC is applied to the base of transistor N1 through resistor R10 and pins 3 and 4 of optocoupler D1. The BE terminal of transistor N1 is turned on, so the collector of the transistor is connected to ground, the collector level is low, the L1 indicator light is on, and the collector of transistor N1 outputs a low-level signal to the microcontroller. The microcontroller detects the low-level signal and sends a turn-on command to the thyristor, causing the motor to rotate and drive the vehicle forward. Attached Figure Description

[0012] Figure 1 This is a circuit block diagram of the present invention.

[0013] Figure 2 This is the circuit schematic diagram of this utility model.

[0014] Figure 3 This is a circuit block diagram from the prior art.

[0015] Figure 4 This is a circuit schematic diagram from the existing technology. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings: like Figure 1-2 The HKT thyristor-based vehicle control signal conversion circuit shown includes a signal input terminal JP1, which is connected to a rectifier unit, which is connected to an isolation unit, and the isolation unit is connected to an electronic switch.

[0017] The rectifier unit includes a capacitor C1. One end of the capacitor C1 is connected to one end of the resistor R1 and the signal input terminal JP1. The other end of the resistor R1 is connected to pin 2 of the rectifier bridge B1. The neutral line AC-N is connected to the other end of the capacitor C1 and pin 1 of the rectifier bridge B1. Pin 3 of the rectifier bridge B1 is connected to the cathode of the Zener diode Z1. The anode of the diode Z1 is connected to the isolation unit. Pin 4 of the rectifier bridge B1 is connected to the isolation unit.

[0018] The isolation unit includes an optocoupler D1. Pin 1 of the optocoupler D1 is connected to the anode of the Zener diode Z1, pin 2 of the optocoupler D1 is connected to pin 4 of the rectifier bridge B1, and pins 3 and 4 of the optocoupler D1 are connected to an electronic switch.

[0019] The electronic switch includes resistor R7. One end of resistor R7 is connected to pin 3 of optocoupler D1, and the other end of resistor R7 is connected to power supply VCC and one end of resistor R9. The other end of resistor R9 is connected to the anode of light-emitting diode L1. The cathode of light-emitting diode L1 is connected to the collector of transistor N1. Pin 4 of optocoupler D1 is connected to one end of resistor R8, the positive terminal of capacitor C7, and the base of transistor N1. The other end of resistor R8, the negative terminal of capacitor C7, and the emitter of transistor N1 are all connected to ground.

[0020] In this invention, the AC control signal is sent to the rectifier unit, the rectifier output is connected to the isolation optocoupler, the isolation optocoupler is connected to the electronic switch, and the high and low level signals output by the electronic switch are sent to the microcontroller. The microcontroller controls the on and off of the thyristor according to different signals, thereby controlling the running state of the motor.

[0021] Figure 2 Pin 1 of the signal input terminal JP1 is control 1-ZZ, which is used to output the forward rotation signal, and pin 2 is control 1-FZ, which is used to output the reverse rotation signal. Both of these control signals are single-phase AC 220V.

[0022] Let's take the control path 1-ZZ as an example for a specific explanation.

[0023] Pin 1 of signal input terminal JP1 is connected to one end of capacitor C1 and one end of resistor R1. The other end of resistor R1 is connected to pin 2 of rectifier bridge B1. The neutral line AC-N is connected to the other end of capacitor C1 and pin 1 of rectifier bridge B1. Pin 3 of rectifier bridge B1 is connected to the cathode of Zener diode Z1. The anode of diode Z1 is connected to pin 1 of optocoupler D1. Pin 4 of rectifier bridge B1 is connected to pin 2 of optocoupler D1. Pin 3 of optocoupler D1 is connected to one end of resistor R7. The other end of resistor R7 is connected to power supply VCC and one end of resistor R9. The other end of resistor R9 is connected to the anode of green LED L1. The cathode of LED L1 is connected to the microcontroller and the collector of transistor N1. Pin 4 of optocoupler D1 is connected to one end of resistor R8, the positive terminal of capacitor C7, and the base of transistor N1. The other end of resistor R8, the negative terminal of capacitor C7, and the emitter of transistor N1 are all connected to ground.

[0024] When the motor needs to rotate forward, pin 1 of the signal input terminal JP1 has an AC voltage of 220V. This voltage signal is sent to the rectifier bridge B1 after being current-limited and voltage-divided by resistor R1. The DC signal after rectification by rectifier bridge B1 is then applied to the isolation optocoupler D1 after being voltage-divided by Zener diode Z1. At this time, optocoupler D1 is turned on. The power supply voltage VCC is applied to the base of transistor N1 through resistor R10, pins 3 and 4 of optocoupler D1. The BE terminal of transistor N1 is turned on, so the collector of transistor N1 is connected to ground and the collector level is low. The indicator light of LED L1 is lit. The collector of transistor N1 outputs a low-level signal to the microcontroller. When the microcontroller detects the low-level signal, it sends a turn-on command to the thyristor, and the motor rotates.

[0025] When the motor stops running, there is no voltage at pin 1 of the signal input terminal JP1, the optocoupler D1 is not conducting, the base of transistor N1 is at a low level, and the BE terminal of transistor N1 is not conducting. Therefore, the collector of transistor N1 is cut off to ground, the collector level is high, the LED L1 indicator light is off, and the collector of transistor N1 outputs a high level to the microcontroller. When the microcontroller detects the high level signal, it sends a shut-off command to the thyristor, and the motor stops rotating.

[0026] This invention utilizes a rectifier bridge to convert AC signals into DC signals and uses optocouplers for isolation and transmission of logic signals, thereby achieving control functions. It avoids the mechanical fatigue problems caused by relays, extending the overall lifespan of the circuit.

[0027] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. An HKT thyristor-based crane control signal conversion circuit, comprising a signal input terminal JP1, characterized in that: The signal input terminal JP1 is connected to the rectifier unit, the rectifier unit is connected to the isolation unit, and the isolation unit is connected to the electronic switch.

2. The HKT thyristor-based crane control signal conversion circuit according to claim 1, characterized in that: The rectifier unit includes a capacitor C1. One end of the capacitor C1 is connected to one end of the resistor R1 and the signal input terminal JP1. The other end of the resistor R1 is connected to pin 2 of the rectifier bridge B1. The neutral line AC-N is connected to the other end of the capacitor C1 and pin 1 of the rectifier bridge B1. Pin 3 of the rectifier bridge B1 is connected to the cathode of the Zener diode Z1. The anode of the diode Z1 is connected to the isolation unit. Pin 4 of the rectifier bridge B1 is connected to the isolation unit.

3. The HKT thyristor-based crane control signal conversion circuit according to claim 2, characterized in that: The isolation unit includes an optocoupler D1. Pin 1 of the optocoupler D1 is connected to the anode of the Zener diode Z1, pin 2 of the optocoupler D1 is connected to pin 4 of the rectifier bridge B1, and pins 3 and 4 of the optocoupler D1 are connected to an electronic switch.

4. The HKT thyristor-based crane control signal conversion circuit according to claim 3, characterized in that: The electronic switch includes resistor R7. One end of resistor R7 is connected to pin 3 of optocoupler D1, and the other end of resistor R7 is connected to power supply VCC and one end of resistor R9. The other end of resistor R9 is connected to the anode of light-emitting diode L1. The cathode of light-emitting diode L1 is connected to the collector of transistor N1. Pin 4 of optocoupler D1 is connected to one end of resistor R8, the positive terminal of capacitor C7, and the base of transistor N1. The other end of resistor R8, the negative terminal of capacitor C7, and the emitter of transistor N1 are all connected to ground.

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