KR20020058656A - Apparatus for driving of invertor lamp - Google Patents

Apparatus for driving of invertor lamp Download PDF

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Publication number
KR20020058656A
KR20020058656A KR1020000086773A KR20000086773A KR20020058656A KR 20020058656 A KR20020058656 A KR 20020058656A KR 1020000086773 A KR1020000086773 A KR 1020000086773A KR 20000086773 A KR20000086773 A KR 20000086773A KR 20020058656 A KR20020058656 A KR 20020058656A
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South Korea
Prior art keywords
transformer
capacitor
switch
winding
primary
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KR1020000086773A
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Korean (ko)
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이상용
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이형도
삼성전기주식회사
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Priority to KR1020000086773A priority Critical patent/KR20020058656A/en
Publication of KR20020058656A publication Critical patent/KR20020058656A/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage

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  • Inverter Devices (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

PURPOSE: A driving device of an inverter lamp is provided to improve double LC resonance efficiency by configuring a single stage circuit with one switch. CONSTITUTION: A driving device of an inverter lamp comprises a first capacitor, a switch, and a second capacitor. The driving device includes a trans for inducing an input voltage of a primary side to a secondary side, and a cold cathode fluorescent lamp driven by an output voltage of the trans. The capacitor is charged by energy stored in the primary side wiring of the trans and realizes an LC resonance circuit with the primary wiring of the trans by using stored charges. The switch is connected between the primary side wiring and a ground terminal of the trans. In case of on-state, the switch allows the primary side wiring to charge the energy. In case of off-state, the switch emits the charges stored at the capacitor. The second capacitor is connected to a secondary side wiring in parallel, and realizes an LC resonance circuit with the secondary side wiring.

Description

인버터 램프의 구동 장치{Apparatus for driving of invertor lamp}Apparatus for driving of invertor lamp

본 발명은 CCFL 구동용 인버터 램프의 구동 장치에 관한 것으로 특히, 1개의 스위치로 싱글 스테이지 회로를 구성하되 2중 LC 공진을 통한 효율을 증대를 제공하면서 기존의 회로에 비하여 낮은 생산 단가를 제공하는 인버터 램프의 구동 장치에 관한 것이다.The present invention relates to a drive device for an inverter lamp for driving a CCFL. In particular, a single stage circuit is composed of one switch, but the inverter provides a higher production efficiency through a double LC resonance while providing a lower production cost than a conventional circuit. It relates to a drive device for a lamp.

일반적으로, 노트북 컴퓨터 등과 같이 LCD를 사용하는 전자장치에는 사용자가 LCD 디스플레이장치에 표시되는 문자 혹은 도형들을 정확하게 볼 수 있도록 LCD 후면에 백라이트라는 조명 수단을 구비하게 된다.In general, an electronic device using an LCD, such as a notebook computer, is provided with an illumination means called a backlight on the back of the LCD so that a user can accurately see the characters or figures displayed on the LCD display device.

이때, 흔히 백라이트로 사용되는 냉음극 형광램프(CCFL)는 DC/DC 변압 방식에 의해 구동용 전압을 발생시키며, 상기 냉음극 형광램프(CCFL)의 구동 전압을 일정하게 유지하기 위해서, 상기 냉음극 형광램프(CCFL)에 구동 전압을 공급해 주는 트랜스의 일차측 전압을 측정한 후 그 측정 결과에 따라 상기 트랜스의 일차측 전압을 조정하여 냉음극 형광램프의 구동 전압을 일정하게 제어한다.In this case, a cold cathode fluorescent lamp (CCFL), which is commonly used as a backlight, generates a driving voltage by a DC / DC transformation method, and in order to maintain a constant driving voltage of the cold cathode fluorescent lamp (CCFL), the cold cathode After measuring the primary side voltage of the transformer for supplying the driving voltage to the fluorescent lamp (CCFL), the primary voltage of the transformer is adjusted according to the measurement result to control the driving voltage of the cold cathode fluorescent lamp constantly.

첨부한 도 1 또는 도 2는 종래의 인버터 램프의 구동 장치의 예들을 보인 것으로 첨부한 도 1은 하프 브릿지(Half Bridge) 방식이라고 칭하는 방식으로, 구비되어 있는 스위칭 수단인 Q1과 Q2가 교번적으로 온/오프를 반복하게되고, 그에 따라 트랜스(T)의 1차 측에 흐르는 전류의 변화가 트랜스(T)의 2차 측으로 유기되어 냉음극 형광램프(CCFL)에 고전압이 걸리게 되는 구조이다.FIG. 1 or FIG. 2 shows examples of a drive device of a conventional inverter lamp. FIG. 1 is a method called a half bridge method. The switching means Q1 and Q2 are alternately provided. On / off is repeated, and accordingly, the change of the current flowing to the primary side of the transformer T is induced to the secondary side of the transformer T, and a high voltage is applied to the cold cathode fluorescent lamp CCFL.

또한, 첨부한 도 2는 풀 브릿지(Full Bridge) 방식이라고 칭하는 방식으로, 구비되어 있는 스위칭 수단인 Qa∼Qd중 참조번호 Qa와 Qd가 온동작시 Qb와 Qc가 오프동작하고 그에 따라 트랜스(T)의 1차 측에 흐르는 전류의 방향이 순방향이라고 가정하면 이후 참조번호 Qa와 Qd가 오프동작하고 Qb와 Qc가 온동작하여 상기 트랜스(T)의 1차 측에 흐르는 전류의 방향이 역방향으로 반전됨으로써 트랜스(T)의 1차 측에 흐르는 전류의 변화가 트랜스(T)의 2차 측으로 유기되어 냉음극 형광램프(CCFL)에 고전압이 걸리게 되는 구조이다.In addition, FIG. 2 is a method called a full bridge method. When reference numerals Qa and Qd of the switching means Qa to Qd which are provided are on, Qb and Qc are turned off and accordingly a transformer (T) is used. Assuming that the direction of the current flowing in the primary side of the () is forward, reference numerals Qa and Qd are turned off and Qb and Qc are turned on so that the direction of the current flowing in the primary side of the transformer T is reversed in the reverse direction. As a result, the change in the current flowing to the primary side of the transformer T is induced to the secondary side of the transformer T, so that a cold voltage is applied to the cold cathode fluorescent lamp CCFL.

이때, 상술한 바와 같은 종래의 기술들을 흔히 싱글-스테이지(single-Stage) 방식이라 칭하는데, 통상 상술한 싱글-스테이지 방식의 인버터 램프 구동 장치는 다른 방식에 비하여 가격적인 면이 생산자에게 부담으로 작용하는 문제점이 발생되었다.In this case, the conventional techniques as described above are often referred to as a single-stage method. In general, the inverter lamp driving apparatus of the single-stage method is more expensive than other methods in terms of cost. The problem occurred.

상기 종래 기술의 문제점을 해소하기 위한 본 발명의 목적은 1개의 스위치로 싱글 스테이지 회로를 구성하되 2중 LC 공진을 통한 효율을 증대를 제공하면서 기존의 회로에 비하여 낮은 생산 단가를 제공하는 인버터 램프의 구동 장치를 제공하는 데 있다.An object of the present invention for solving the problems of the prior art is to configure a single stage circuit with one switch, but to provide an increase in efficiency through double LC resonance while providing a lower production cost than conventional circuits. It is to provide a driving device.

도 1은 하프 브릿지(Half Bridge) 방식의 인버터 램프의 구동 장치의 예시도.BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an illustration of a drive device for an inverter lamp of a half bridge method.

도 2는 풀 브릿지(Full Bridge) 방식의 인버터 램프의 구동 장치의 예시도.2 is an exemplary view of a drive device for an inverter lamp of a full bridge method.

도 3은 본 발명에 따른 싱글-스테이지 방식의 인버터 램프 구동 장치의 예시도.Figure 3 is an illustration of a single-stage inverter lamp drive device according to the present invention.

상기 목적을 달성하기 위한 본 발명의 특징은, 1차측 권선에 유입되는 입력 전압을 2차측 권선으로 유기 시키는 트랜스와, 상기 트랜스에서 출력되는 전압으로 구동하는 냉음극 형광램프를 구비한 인버터 램프의 구동 장치에 있어서: 상기 트랜스의 1차측 권선에 축적되어진 에너지에 의해 충전되며 축적된 전하를 이용하여 상기 트랜스의 1차측 권선과 LC공진회로를 구현하는 제 1캐패시터와; 상기 트랜스의 1차측 권선과 접지단 사이에 연결되며 온동작시 상기 트랜스의 1차측 권선에 에너지를 축적하도록하며 오프 동작시 캐패시터에 축적된 전하를 방출시키는 스위치; 및 상기 트랜스의 2차측 권선과 병렬연결되어 상기 트랜스의 2차측 권선과 LC공진회로를 구현하는 제 2캐패시터를 포함하는 데 있다.A feature of the present invention for achieving the above object is the drive of an inverter lamp having a transformer for inducing the input voltage flowing in the primary winding to the secondary winding, and a cold cathode fluorescent lamp for driving at the voltage output from the transformer. An apparatus comprising: a first capacitor that is charged by energy accumulated in a primary winding of a transformer and uses an accumulated charge to implement an LC resonance circuit with a primary winding of the transformer; A switch connected between the primary side winding of the transformer and a ground terminal and configured to accumulate energy in the primary side winding of the transformer during an on operation, and to discharge charge accumulated in a capacitor during an off operation; And a second capacitor connected in parallel with the secondary winding of the transformer to implement an LC resonance circuit with the secondary winding of the transformer.

본 발명의 상술한 목적과 여러 가지 장점은 이 기술 분야에 숙련된 사람들에 의해 첨부된 도면을 참조하여 후술되는 발명의 바람직한 실시예로부터 더욱 명확하게 될 것이다.The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

이하, 상기와 같은 기술적 사상에 따른 본 발명의 바람직한 실시 예를 첨부한 도면에 의거 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above in detail.

첨부한 도 3은 본 발명에 따른 인버터 램프의 구동 장치의 예시도로서, 참조번호 L1은 트랜스(T)의 1차측 권선을 지칭하며, 참조번호 L2은 트랜스(T)의 2차측 권선을 지칭하고, 참조번호 Cf은 트랜스(T)의 1차측 권선(L1)의 일단과 접지단사이에 연결되어 있으며 전하의 충전상태에서 상기 1차측 권선(L1)과 함께 LC공진을 수행하기 위한 제 1캐패시터이며, 참조번호 Cp는 상기 트랜스(T)의 2차측 권선(L2)에 병렬연결되어 상기 트랜스의 2차측 권선(L2)과 LC공진회로를 구현하는 제 2캐패시터이며, 상기 트랜스(T)의 1차측 권선(L1)에 흐르는 전류의 변동을 주기 위한 수단으로써 상기 제 1캐패시터(Cf)에 병렬로 연결되어 있는 스위치(Q)가 구비된다.3 is an exemplary view of a driving device of an inverter lamp according to the present invention, in which reference numeral L1 denotes a primary winding of a transformer T, and reference numeral L2 denotes a secondary winding of a transformer T. , Cf is connected between one end of the primary winding L1 of the transformer T and the ground terminal, and is a first capacitor for performing LC resonance together with the primary winding L1 in a state of charge charge. , Cp is a second capacitor connected in parallel to the secondary winding (L2) of the transformer (T) to implement the LC winding circuit and the secondary winding (L2) of the transformer, the primary side of the transformer (T) As a means for varying the current flowing through the winding L1, a switch Q connected in parallel with the first capacitor Cf is provided.

상기와 같이 구성되는 본 발명에 따른 인버터 램프의 구동 장치는 스위치(Q)가 도시하지 않은 스위칭 제어부의 제어동작에 따라 온오프 동작을 반복하게 되는데, 상기 스위치(Q)가 온동작시 트랜스(T)의 1차측 권선(L1)에 에너지가 축적되고 상기 스위치(Q)가 오프동작시 상기 트랜스(T)의 1차측 권선(L1)에 축적되어진 에너지가 방전되는 가운데 연결되어 있는 제1캐패시터(Cf)에 충전되며 이후 상기 제 1캐패시터(Cf)의 방전경로상에 존재하는 상기 트랜스(T)의 1차측 권선(L1)에 다시 에너지가 축적되는 과정을 반복하여 LC공진이 일어나게 된다.The drive device of the inverter lamp according to the present invention configured as described above is to repeat the on-off operation in accordance with the control operation of the switching control unit (not shown) switch Q, when the switch (Q) is on the transformer (T) Energy is accumulated in the primary winding (L1) of the first and the first capacitor (Cf) connected while the energy stored in the primary winding (L1) of the transformer (T) is discharged when the switch (Q) is turned off. ) And then accumulate energy in the primary winding L1 of the transformer T again on the discharge path of the first capacitor Cf to generate LC resonance.

이와 같은 방법으로 상기 트랜스(T)의 1차측 권선(L1)에 흐르는 전류의 방향이 변동하게되고 이를 기준으로 트랜스(T)는 2차측 권선(L2)으로 고전압의 전원을 유기시키게 된다.In this way, the direction of the current flowing in the primary winding L1 of the transformer T is varied and based on this, the transformer T induces a high voltage power supply to the secondary winding L2.

또한, 상기 트랜스(T)는 2차측 권선(L2)에 유기되어진 전압은 제 2캐패시터(Cp)와 LC공진하게 되어 이중공진 효과에 의해 냉음극 형광램프(CCFL)에고주파 고전압이 걸리게 된다.In addition, the voltage T induced in the secondary winding L2 of the transformer T is LC-resonated with the second capacitor Cp, and the high frequency high voltage is applied to the cold cathode fluorescent lamp CCFL by the double resonance effect.

이상의 설명에서 본 발명은 특정의 실시 예와 관련하여 도시 및 설명하였지만, 특허청구범위에 의해 나타난 발명의 사상 및 영역으로부터 벗어나지 않는 한도 내에서 다양한 개조 및 변화가 가능하다는 것을 당 업계에서 통상의 지식을 가진 자라면 누구나 쉽게 알 수 있을 것이다.While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

이상에서 상술한 본 발명에 따른 인버터 램프의 구동 장치를 제공하면, 1개의 스위치로 싱글 스테이지 회로를 구성하되 2중 LC 공진을 통한 효율을 증대를 제공하면서 기존의 회로에 비하여 낮은 생산 단가 얻는 이점이 있다.The above-described drive device for an inverter lamp according to the present invention provides a single stage circuit with one switch, but provides an increase in efficiency through a double LC resonance while achieving a lower production cost than a conventional circuit. have.

Claims (1)

1차측 권선에 유입되는 입력 전압을 2차측 권선으로 유기 시키는 트랜스와, 상기 트랜스에서 출력되는 전압으로 구동하는 냉음극 형광램프를 구비한 인버터 램프의 구동 장치에 있어서:A drive device for an inverter lamp having a transformer for inducing an input voltage introduced into a primary winding to a secondary winding, and a cold cathode fluorescent lamp driven at a voltage output from the transformer: 상기 트랜스의 1차측 권선에 축적되어진 에너지에 의해 충전되며 축적된 전하를 이용하여 상기 트랜스의 1차측 권선과 LC공진회로를 구현하는 캐패시터와;A capacitor which is charged by energy accumulated in the primary winding of the transformer and implements an LC resonant circuit with the primary winding of the transformer by using the accumulated charge; 상기 트랜스의 1차측 권선과 접지단 사이에 연결되며 온동작시 상기 트랜스의 1차측 권선에 에너지를 축적하도록하며 오프 동작시 캐패시터에 축적된 전하를 방출시키는 스위치; 및A switch connected between the primary side winding of the transformer and a ground terminal and configured to accumulate energy in the primary side winding of the transformer during an on operation, and to discharge charge accumulated in a capacitor during an off operation; And 상기 트랜스의 2차측 권선과 병렬연결되어 상기 트랜스의 2차측 권선과 LC공진회로를 구현하는 제 2캐패시터를 포함하는 것을 특징으로 하는 인버터 램프의 구동 장치.And a second capacitor connected in parallel with the secondary winding of the transformer to implement an LC resonance circuit with the secondary winding of the transformer.
KR1020000086773A 2000-12-30 2000-12-30 Apparatus for driving of invertor lamp KR20020058656A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660988A (en) * 1992-08-05 1994-03-04 Ushio Inc Small fluorescent lamp lighting device
JPH07183083A (en) * 1993-12-24 1995-07-21 Sharp Corp Lamp control circuit for cooking apparatus
JPH09260076A (en) * 1996-03-22 1997-10-03 Toko Inc Lighting dimming circuit for cold cathode fluorescent lamp
KR19980085907A (en) * 1997-05-30 1998-12-05 이형도 Inverter Frequency Control Circuit Using Piezoelectric Transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660988A (en) * 1992-08-05 1994-03-04 Ushio Inc Small fluorescent lamp lighting device
JPH07183083A (en) * 1993-12-24 1995-07-21 Sharp Corp Lamp control circuit for cooking apparatus
JPH09260076A (en) * 1996-03-22 1997-10-03 Toko Inc Lighting dimming circuit for cold cathode fluorescent lamp
KR19980085907A (en) * 1997-05-30 1998-12-05 이형도 Inverter Frequency Control Circuit Using Piezoelectric Transformer

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