KR950024408A

KR950024408A - Inverter overcurrent protection circuit

Info

Publication number: KR950024408A
Application number: KR1019940001455A
Authority: KR
Inventors: 최재영
Original assignee: 이헌조; 엘지전자 주식회사
Priority date: 1994-01-27
Filing date: 1994-01-27
Publication date: 1995-08-21

Abstract

본 발명은 인버터 회로에서 부하측의 전원을 스위칭하는 출력부의 스위칭 소자 손상으로 인한 단락 발생시에 이를 검츨하고, 검츨 결과 단락이 발생된 경우에는 출력부에 구급되는 전원 자체를 차단 시켜 과전류로부터 회로 소자를 보호할 수 있도륵 한 인버터의 과전류 보호 회로에 관한 것이다.The present invention detects when a short circuit occurs due to damage of a switching element of an output unit that switches the power of the load side in an inverter circuit, and when a short circuit occurs as a result of the detection, the circuit element is protected from overcurrent by shutting off the power supply to the output unit. The present invention relates to an overcurrent protection circuit of an inverter.

종래의 과전류 보호회로는 전원 스위칭 소자의 부분적인 파손에만 대처할 수 있고, 한쌍의 스위칭 소자가 모두 파손된 경우에는 대응할 수 없기 때문에 과전류 보호 동작의 신뢰성이 결여되며, 과전류에 의한 회로 손상과 수리상의 어려움이 초래되는 문제점이 있다.The conventional overcurrent protection circuit can only cope with partial breakage of the power switching element, and cannot cope with the case where all of the pair of switching elements are broken, so the reliability of the overcurrent protection operation is insufficient. There is a problem brought about.

본 발명은 과전류 검출부(9)에서 과전류를 검출한 결과로 출력되는 신호를 입력받아 과전류 검출의 지속 시간을 카운트하는 카운트수단(13)과, 상기 카운트수단(13)의 카운트 결과 및 과전류 검출부(9)의 검츨 신호를 입력으로 하여 전원 차단 신호를 출력하는 게이트수단(14)과, 상기 평활부(2)로부터 출력부(4)로 공급되는 전원을 상기 게이트 수단(14)의 제어를 받아 차단시키는 스위칭수단(15)으로 구성된 과전류 보호 회로로서, 상기한 종래의 문제점을 해소하고, 1차적으로 구동부와 제어부의 동작이 중단되어 과전류를 차단 제어한 상태에서도 일정 시간 계속하여 과전류가 검츨되면 츨력부에 공급되는 전원 자체를 차단시켜 줌으로써 인버터의 과전류 보호 등작에 고도의 신뢰를 기하고, 과전류에 의한 회로 손상을 방지할 수 있도록 한 인버터의 과전류 보호 회로이며, 인버터 회로에 적용한다.According to the present invention, the counting unit 13 receives a signal output as a result of detecting the overcurrent by the overcurrent detecting unit 9 and counts the duration of the overcurrent detection, the count result of the counting unit 13 and the overcurrent detecting unit 9. Gate means 14 for outputting a power cutoff signal by inputting a detection signal of < RTI ID = 0.0 >) and < / RTI > An overcurrent protection circuit composed of the switching means (15) solves the above-mentioned conventional problems, and primarily stops the operation of the drive unit and the control unit and stops the overcurrent. The overcurrent of the inverter is designed to cut off the power supply itself so that the inverter can be protected against overcurrent protection, and the circuit damage caused by the overcurrent can be prevented. It is a protection circuit and applies to inverter circuits.

Description

Inverter overcurrent protection circuit

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

제4도는 본 발명의 인버터의 과전류 보호 회로의 블록 구성도.4 is a block diagram of an overcurrent protection circuit of the inverter of the present invention.

Claims

A rectifier 1 for rectifying the input three-phase AC power with DC, a smoothing part 2 for smoothing the DC power rectified in the rectifying part 1, and a smoothing part 4 for outputting the smoothing part 4. A current detector 3 for detecting a current supplied to the output unit, an output unit 4 for switching the power supplied from the smoothing unit 3, a motor 5 subjected to switching control of the output unit 4, And a control unit (8) for controlling the switching drive of the output unit (4) and a control unit (8) for controlling the switching drive of the bulb (6). In the inverter circuit, from the current detection unit (3) An overcurrent detector 9 for receiving the current detection signal S2 and detecting whether there is an overcurrent; an overvoltage detector 10 for receiving the voltage detection signal S1 from the smoothing unit 2 and detecting whether there is an overvoltage; A low voltage detector 11 for receiving a voltage detection signal S1 and detecting a low voltage, and outputs each of the detectors. A count for counting the duration of the overcurrent detection by receiving the signal output as a result of detecting the overcurrent by the AND gate 12 supplied to the controller 8 and the driver 6 and multiplied. Output from the smoothing section 2 and the gate means 14 for outputting a power-off signal by means of the means 13, the count result of the counting means 13 and the detection signal of the overcurrent detector 9 as input. An over-current protection circuit of an inverter, characterized in that consisting of switching means for blocking the power supplied to the unit (4) under the control of the gate means (14).

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