KR980007869A

KR980007869A - Ballast Circuit for Cold Cathode Fluorescent Lamp Using Leakage Inductance

Info

Publication number: KR980007869A
Application number: KR1019960020918A
Authority: KR
Inventors: 성환호; 이상우
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1996-06-12
Filing date: 1996-06-12
Publication date: 1998-03-30

Abstract

본 발명은 누설 인덕턱스를 이용한 냉음극 형광등용 안정기회로에 관한 것으로서, 특히 입력전압과 제1 노드 사이에 연결되어 제1 제어신호에 응답하여 스위칭되는 제1 스위칭 트랜지스터; 상기 제1 노드와 접지 전압 사이에 연결되어 제2제어신호에 응답하여 상기 제1스위칭 트랜지스터와 교호로 스위칭되는 제2 스위칭 트랜지스터; 누설 인덕턴스와 자화 인덕턴스를 가지는 트랜스포머; 일단이 상기 접지 전압에 연결된 상기 트랜스코머의 1차측 권선의 타단돠 상기 제1 노드 사이에 연결된 제1 캐패시터; 상기 트랜스포머의 2차측 권선의 양단에 연결된 냉음극 형광등; 및 상기 냉음극 형광등에 인가되는 출력전류의 변화를 감지하여 상기 제1 및 제2제어신호를 발생하는 제어회로부를 구비하는 것을 특징으로 한다.The present invention relates to a ballast circuit for cold cathode fluorescent lamps using a leakage inductance, and more particularly, comprising: a first switching transistor connected between an input voltage and a first node and switched in response to a first control signal; A second switching transistor connected between the first node and a ground voltage and alternately switched to the first switching transistor in response to a second control signal; Transformers having leakage inductance and magnetizing inductance; A first capacitor connected between the first node and the other end of the primary winding of the transformer having one end connected to the ground voltage; A cold cathode fluorescent lamp connected to both ends of the secondary winding of the transformer; And a control circuit unit which detects a change in an output current applied to the cold cathode fluorescent lamp and generates the first and second control signals.

Description

Ballast Circuit for Cold Cathode Fluorescent Lamp Using Leakage Inductance

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명에 의한 누설 인덕턱스를 이용한 냉음극 형광등용 안정기회로의 구성을 나타낸 회로도, 제3도는 트랜스포머의 등가회로도.2 is a circuit diagram showing the configuration of a ballast circuit for cold cathode fluorescent lamps using the leakage inductance according to the present invention, Figure 3 is an equivalent circuit diagram of a transformer.

Claims

A first switching transistor connected between the input voltage and the first node and switched in response to the first control signal; A second switching transistor connected between the first node and a ground voltage and alternately switched to the first switching transistor in response to a second control signal; Transformers having leakage inductance and magnetizing inductance; A first capacitor connected between the first node and the other end of the primary winding of the transformer having one end connected to the ground voltage; A cold cathode fluorescent lamp connected to both ends of the secondary winding of the transformer; And a control circuit unit which detects a change in an output current applied to the cold cathode fluorescent lamp and generates the first and control signals.

The method of claim 1, wherein the transformer has a leakage inductance such that the resonance frequency of the leakage inductance of the first capacitor and the transformer maintains a frequency higher than the resonant frequency of the magnetizing inductance of the first capacitor and the transformer. Ballast circuit for cold cathode fluorescent lamp using leakage inductance.

2. The ballast circuit for a cold cathode fluorescent lamp using a leakage inductance according to claim 1, wherein a second capacitor is further obtained between one end of the secondary winding of the transformer and the cold cathode fluorescent lamp.