KR970055030A

KR970055030A - Short protection circuit of motor controller

Info

Publication number: KR970055030A
Application number: KR1019950069234A
Authority: KR
Inventors: 박재순
Original assignee: 석진철; 대우중공업 주식회사
Priority date: 1995-12-30
Filing date: 1995-12-30
Publication date: 1997-07-31

Abstract

본 발명에 따른 쇼트 보호회로는 배터리(BAT); 스위칭소자(Q1); 모터(7); 상기 모터(7)에 병렬 연결되는 다이오드(D2); 상기 다이오드(D2) 및 모터(7)의 쇼트를 검출하는 쇼트검출부(20); 악셀레이터의 조작 정도에 따라 스위칭소자(Q1)를 턴-온시키기 위한 제1펄스신호(PULSE I)와 상기 스위칭소자(Q1)의 온듀티비를 조절하기 위한 제2펄스신호(PULSE Ⅱ)를 출력하는 마이크로 프로세서(1); 정상상태에서는 상기 마이크로 프로세서(1)로부터 제1펄스신호(PULSE I)와 제2펄스 신호(PULSE Ⅱ)를 입력받아 스위칭소자를 구도하고, 상기 쇼트검출부(20)가 모터(7)나 다이오드(D2)의 쇼트를 검출하면, 상기 스위칭소자(Q1)를 턴-오프하기 위한 구동신호를 발생하는 구동신호 발생부; 상기 구동신호 발생부의 출력에 따라 상기 스위칭소자를 턴-온 또는 턴-오프시키는 구동부(6)로 구성되어 있다. 따라서 쇼트가 검출되면 마이크로 프로세서를 통하지 않고 하드웨어적으로 직접 스위칭소자를 신속하게 턴-오프시키므로 스위칭소자가 연쇄적으로 파손되는 것을 방지할 수가 있다.The short protection circuit according to the present invention includes a battery BAT; Switching element Q1; A motor 7; A diode (D2) connected in parallel with the motor (7); A short detector 20 detecting a short of the diode D2 and the motor 7; Outputs the first pulse signal PULSE I for turning on the switching element Q1 and the second pulse signal PULSE II for adjusting the on duty ratio of the switching element Q1 according to the degree of operation of the accelerator. A microprocessor 1; In the steady state, the first pulse signal PULSE I and the second pulse signal PULSE II are input from the microprocessor 1 to form a switching device, and the short detection unit 20 includes a motor 7 or a diode ( A driving signal generator for generating a driving signal for turning off the switching element Q1 when detecting the short of D2); It consists of a drive unit 6 for turning on or off the switching element in accordance with the output of the drive signal generator. Therefore, when a short is detected, the switching device is turned off by hardware directly without using a microprocessor, thereby preventing the switching device from being damaged in series.

Description

Short protection circuit of motor controller

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 모터 제어장치의 쇼트 보호회로를 도시한 회로도,1 is a circuit diagram showing a short protection circuit of the motor control apparatus according to the present invention;

제3도는 종래의 모터 제어장치의 쇼트 보호회로를 도시한 블럭도이다.3 is a block diagram showing a short protection circuit of a conventional motor control apparatus.

Claims

In the driving control apparatus for an industrial vehicle in which the battery element is supplied to the motor 7 by turning on and off the switching element Q1 according to the command of the microprocessor 1, wherein the diode D2 is connected in parallel with the motor. Or short detection means 20 for detecting that the motor is shorted; And a driving signal for turning on or off the switching element in accordance with the command of the microprocessor in the normal state. When the short detection means detects a short of the diode or the motor, the switching element is turned on regardless of the command of the microprocessor. A short protection circuit of a motor control apparatus, characterized by comprising drive signal generation means for generating a drive signal for turning-off.

The circuit of claim 1, wherein the short detector (20) comprises: distribution resistors (R4, R5) for distributing a voltage applied from the battery when the switch element (Q1) is turned on; A delay unit 22 for delaying the inverted driving signal; And a no-gate (21) for detecting a short by negatively combining the delayed driving signal with the divided voltage.

The motor of claim 2, wherein a zener diode ZD1 is connected between a common connection terminal of the distribution resistors R4 and R5 and a ground to prevent an overvoltage from being input to the noar gate 21. Short protection circuit of control device.

According to claim 1, wherein the drive signal generator comprises a latch (10) for receiving and latching the output of the second pulse signal (PULSE II) of the microprocessor (1) and the short detection means (20); And a NAND gate (2) for negatively multiplying the output of the latch (10) with the first pulse signal (PULSE I).

※ Note: The disclosure is based on the initial application.