KR960009596A

KR960009596A - Horizontal output transistor protection circuit

Info

Publication number: KR960009596A
Application number: KR1019940021331A
Authority: KR
Inventors: 이성로
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1994-08-29
Filing date: 1994-08-29
Publication date: 1996-03-22

Abstract

본 발명은 수평출력트랜지스터 보호회로에 관한 것으로 해당 텔레비전의 수평편향을 실행하는 수평편향회로부(10) 및 그수평편향회로부(10)에서 제공되는 수평주파수에 의해 스위칭동작하여 수평출력을 행하는 수평출력트랜지스터(21)를 갖춘 수평출력회로부(20)및 상용AC전원을 정류하여 상기 수평편향회로부(10)와 상기 수평출력회로부(20)를 포함하는 해당 텔레비전의 동작전원을 공급하는 전원회로부(40)를 포함하여 구성된 텔레비전에서 상기 수평출력트랜지스터(21)의 출력단에 접속되어 그 수평출력트랜지스터(21)의 출력단의 출력레벨을 기준치와 비교하여 과전류상태를 검출하는 과전류검출부(30)와 그 과전류검출부(30)에 의해 상기 수평출력트랜지스터(21)의 과전류상태가 검출되면 상기 상용 AC전원의 차단제어를 행하는 상기 전원회로부(40)의 마이컴(46), 이 마이컴(46)에 의한 상용AC전원의 차단제어에 응답하여 비도통상태로 되어 상기 상용AC전원경로상에 접점이 형성된 릴레이(53)를 비활성상태로 제어하는 상기 전원회로부(40)의 스위칭트랜지스터(52)를 갖추어 구성되어 상기 수평출력트랜지스터(21)에 흐르는 전류를 기준치와 비교하여 과전류상태로 되면 마이컴(46)의 제어하에 상용AC전원을 차단하여 그 수평출력트랜지스터(21)를 과전류상태로 부터 보호하도록된 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal output transistor protection circuit, in which a horizontal output transistor for performing a horizontal deflection of a television and a horizontal output transistor for performing a horizontal output by a horizontal frequency provided by the horizontal deflection circuit section 10 and the horizontal deflection circuit section 10. A horizontal output circuit section 20 having 21 and a power supply circuit section 40 for rectifying commercial AC power to supply operating power of the television including the horizontal deflection circuit section 10 and the horizontal output circuit section 20; An overcurrent detector 30 and an overcurrent detector 30 connected to an output terminal of the horizontal output transistor 21 to detect an overcurrent state by comparing an output level of the output terminal of the horizontal output transistor 21 with a reference value in a television configured to include the same; When the overcurrent state of the horizontal output transistor 21 is detected, The power supply circuit unit which is in a non-conductive state in response to the COM 46 and the blocking control of the commercial AC power by the microcomputer 46, and controls the relay 53 having a contact formed on the commercial AC power path in an inactive state ( 40 is provided with a switching transistor 52, when the current flowing in the horizontal output transistor 21 is compared to the reference value when the overcurrent state, the commercial AC power under the control of the microcomputer 46, the horizontal output transistor 21 ) To protect against overcurrent.

Description

Horizontal output transistor protection circuit

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

제2도는 제1도에 도시된 수평출력회로부의 동작을 설명하는 파형도.FIG. 2 is a waveform diagram illustrating the operation of the horizontal output circuit portion shown in FIG.

제3도는 본 발명에 따른 수평출력트랜지스터 보호회로를 나타낸 도면.3 is a diagram showing a horizontal output transistor protection circuit according to the present invention.

제4도는 본 발명에 따른 수평출력트랜지스터 보호회로가 적용된 텔레비전의 전원회로부를 설명하는 도면이다.4 is a diagram illustrating a power supply circuit unit of a television to which a horizontal output transistor protection circuit according to the present invention is applied.

Claims

Horizontal output circuit section 20 having a horizontal deflection circuit section 10 for performing a horizontal deflection of the television and a horizontal output transistor 21 for switching horizontally by the horizontal frequency provided from the horizontal deflection circuit section 10 to perform horizontal output. And a power supply circuit unit 40 for rectifying commercial AC power to supply operation power of the television including the horizontal deflection circuit unit 10 and the horizontal output circuit unit 20. The horizontal output transistor 21 by an overcurrent detector 30 and the overcurrent detector 30 which detect an overcurrent state by comparing the output level of the output terminal of the horizontal output transistor 21 with a reference value. The microcomputer 46 of the power supply circuit section 40 and the commercial AC power breaker by the microcomputer 46 perform the blocking control of the commercial AC power when an overcurrent condition of A horizontal output transistor comprising a switching transistor 52 of the power supply circuit portion 40 which is in a non-conductive state in response to the non-conductive state and controls the relay 53 having a contact formed on the commercial AC power path in an inactive state. Protection circuit.

2. The overcurrent detector (30) of claim 1, wherein the overcurrent detector (30) has a first input terminal (+) connected to the output terminal of the horizontal output transistor (21) and connected to the output level of the horizontal output transistor (21) at the second input terminal (-). And a comparator for comparing the output level of the horizontal output transistor (21) with respect to the reference value.

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