KR100597205B1 - Circuit for stabilizing low-voltage lighting of invertor - Google Patents

Circuit for stabilizing low-voltage lighting of invertor Download PDF

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KR100597205B1
KR100597205B1 KR1020040076838A KR20040076838A KR100597205B1 KR 100597205 B1 KR100597205 B1 KR 100597205B1 KR 1020040076838 A KR1020040076838 A KR 1020040076838A KR 20040076838 A KR20040076838 A KR 20040076838A KR 100597205 B1 KR100597205 B1 KR 100597205B1
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transformer
lighting
circuit
output terminal
parallel
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KR1020040076838A
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Korean (ko)
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KR20060027934A (en
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박연도
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엘지이노텍 주식회사
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/24Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • H05B41/245Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency for a plurality of lamps
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02Details
    • H05B41/04Starting switches

Abstract

트랜스포머의 출력단에 다수개의 램프들이 병렬로 연결되는 병렬구동 인버터 회로에 있어서, 트랜스포머 출력단에 병렬로 연결된 제 1 및 제 2 저항 중의 어느 하나에 컬렉터가 연결되고, 이미터가 접지되며, 트랜스포머 출력단으로부터 검출되는 과전압 보호신호가 베이스에 인가되는 트랜지스터를 포함하는 인버터의 저전압 점등 안정화회로가 개시된다. 초기 점등시에 램프에 인가되는 전류를 감소시킴으로써 출력 파워를 줄여 저온, 저전압에서도 안정적인 점등을 할 수 있다는 이점이 있다.In a parallel drive inverter circuit in which a plurality of lamps are connected in parallel to an output terminal of a transformer, a collector is connected to one of the first and second resistors connected in parallel to the transformer output terminal, an emitter is grounded, and a detection from the transformer output terminal. A low voltage lighting stabilization circuit of an inverter including a transistor to which an overvoltage protection signal is applied to a base is disclosed. By reducing the current applied to the lamp during initial lighting, there is an advantage that the output power is reduced and stable lighting is possible even at low temperature and low voltage.

저온, 저전압, 출력파워, wattage, 안정Low temperature, low voltage, output power, wattage, stable

Description

인버터의 저전압 점등 안정화회로{Circuit for stabilizing low-voltage lighting of invertor}Circuit for stabilizing low-voltage lighting of invertor

도 1은 종래의 점등 안정화회로를 보여주는 회로도이다.1 is a circuit diagram showing a conventional lighting stabilization circuit.

도 2는 본 발명의 일 실시예에 따른 점등 안정화회로를 보여주는 회로도이다.2 is a circuit diagram illustrating a lighting stabilization circuit according to an exemplary embodiment of the present invention.

본 발명은 인버터의 저전압 점등 안정화회로에 관한 것이다.The present invention relates to a low voltage lighting stabilization circuit of an inverter.

일반적으로 LCD 백라이트용 인버터는 직류 전원을 교류 전원으로 변환 후 트랜스포머를 이용하여 고전압을 발생시켜 냉음극형광램프를 구동하는 역할을 한다.In general, an LCD backlight inverter drives a cold cathode fluorescent lamp by converting a DC power source into an AC power source and generating a high voltage using a transformer.

이와 같은 인버터에는 저전압에서 램프를 안정적으로 점등할 수 있도록 하는 점등 안정화회로가 제공된다.Such an inverter is provided with a lighting stabilization circuit for stably lighting the lamp at low voltage.

도 1은 종래의 점등 안정화회로를 보여주는 회로도이다.1 is a circuit diagram showing a conventional lighting stabilization circuit.

트랜스포머 T 하나가 다수의 램프들(램프 1 ... 램프 n)을 동작시키는데, 최저온도와 최저 입력전압에서도 램프가 켜질 수 있도록 트랜스포머 권선비와 기타 컨트롤러 회로를 설정한다.One transformer T operates multiple lamps (lamp 1 ... lamp n), which sets the transformer turns ratio and other controller circuitry so that the lamps can be turned on at the lowest temperature and lowest input voltage.

트랜스포머 T의 출력단에 걸리는 출력전류 I0는 전류제어용 저항 Rs1과 Rs2에 의해 고정된다.The output current I 0 across the output of transformer T is fixed by the current control resistors Rs1 and Rs2.

램프들은 저온으로 갈수록 내부에 존재하는 수은이온이 비활성화되어 있어 점등 임피던스가 증가하게 된다. 이와 같이 램프의 부하가 증가하면, 출력전류가 일정하기 때문에 출력전압이 증가한다.As the lamps get colder, mercury ions are deactivated and the lighting impedance increases. In this way, when the load of the lamp increases, the output voltage increases because the output current is constant.

따라서, 저온에서 램프를 점등하기 위해서는 트랜스포머의 출력 파워를 증가시켜야 한다. 다시 말해, 평상시보다 트랜스포머가 더 많은 에너지를 공급해야 한다.Therefore, to turn on the lamp at low temperature, the output power of the transformer must be increased. In other words, the transformer must supply more energy than usual.

그러나, 상기한 바와 같이, 트랜스포머의 최대 출력 파워는 설계상 미리 결정되어 있어 결국 트랜스포머의 마진을 크게 해야 하는 문제가 있다.However, as described above, the maximum output power of the transformer is predetermined in design, resulting in a problem in that the margin of the transformer must be increased.

또한, 트랜스포머의 출력 파워를 증가시키기 위하여 권선비를 증가하면, 발열온도가 증가하게 된다.In addition, if the turns ratio is increased to increase the output power of the transformer, the heating temperature is increased.

따라서, 본 발명의 목적은 저온, 저전압에서 램프의 점등이 원활하게 이루어질 수 있는 인버터의 저전압 점등 안정화회로를 제공하는 것이다.Accordingly, it is an object of the present invention to provide a low voltage lighting stabilization circuit of an inverter which can smoothly turn on a lamp at low temperature and low voltage.

본 발명의 다른 목적과 특징들은 이하에 서술되는 바람직한 실시예를 통하여 명확하게 이해될 것이다.Other objects and features of the present invention will be clearly understood through the preferred embodiments described below.

본 발명에 따르면, 트랜스포머의 출력단에 다수개의 램프들이 병렬로 연결되는 병렬구동 인버터 회로에 있어서, 트랜스포머 출력단에 병렬로 연결된 제 1 및 제 2 저항 중의 어느 하나에 컬렉터가 연결되고, 이미터가 접지되며, 트랜스포머 출력단으로부터 검출되는 과전압 보호신호가 베이스에 인가되는 트랜지스터를 포함하는 인버터의 저전압 점등 안정화회로가 개시된다.According to the present invention, in a parallel drive inverter circuit in which a plurality of lamps are connected in parallel to an output terminal of a transformer, a collector is connected to one of the first and second resistors connected in parallel to the transformer output terminal, and the emitter is grounded. A low voltage lighting stabilization circuit of an inverter including a transistor to which an overvoltage protection signal detected from a transformer output stage is applied to a base is disclosed.

바람직하게, 과전압 보호신호는 시간지연회로를 통하여 일정한 시간 지연후 베이스에 인가될 수 있다.Preferably, the overvoltage protection signal may be applied to the base after a certain time delay through the time delay circuit.

이하, 첨부된 도면을 참조하여 본 발명의 일 실시예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

도 2는 본 발명의 일 실시예에 따른 점등 안정화회로를 보여주는 회로도이다. 도 1과 동일한 구성에 대해서는 상세한 설명을 생략한다.2 is a circuit diagram illustrating a lighting stabilization circuit according to an exemplary embodiment of the present invention. Detailed description of the same configuration as in FIG. 1 is omitted.

도 2를 참조하면, 전류제어용 저항 Rs1과 Rs2 중 어느 하나는 트랜지스터 Q의 컬렉터에 연결되고, 트랜지스터 Q의 이미터는 접지된다. 또한, 트랜스포머 T의 출력단으로부터 검출되는 과전압 보호신호(OVP)가 트랜지스터 Q의 베이스에 인가되도록 연결된다.2, one of the current control resistors Rs1 and Rs2 is connected to the collector of the transistor Q, and the emitter of the transistor Q is grounded. In addition, the overvoltage protection signal OVP detected from the output terminal of the transformer T is connected to be applied to the base of the transistor Q.

또한, 과전압 보호신호(OVP)는 시간지연회로 R1, R2 및 C4에 의해 일정시간 지연될 수 있다.In addition, the overvoltage protection signal OVP may be delayed for a predetermined time by the time delay circuits R1, R2, and C4.

이와 같은 구성에 따른 점등 안정화회로의 동작을 이하 설명한다.The operation of the lighting stabilization circuit according to such a configuration will be described below.

먼저, 초기에 점등시 전원이 인가되면, 과전압 보호신호(OVP)가 0V로 로우(low)이기 때문에 트랜지스터 Q는 오프된다. 따라서, 전류제어용 저항 R = Rs1이 되어 출력전류 I0는 감소된다.First, when power is initially applied during lighting, the transistor Q is turned off because the overvoltage protection signal OVP is low at 0V. Therefore, the current control resistor R = Rs1 is reduced and the output current I 0 is reduced.

따라서, 초기 점등시에는 출력전류 I0가 감소하기 때문에 램프의 저온특성에 의해 점등 임피던스가 증가하여 출력전압이 증가하더라도 전체적인 출력 파워는 증가하지 않게 된다.Therefore, since the output current I 0 decreases during the initial lighting, the overall output power does not increase even if the lighting impedance increases due to the low temperature characteristic of the lamp and the output voltage increases.

한편, 정상 동작시에는 과전압 보호신호(OVP)가 4 - 5V로 하이(high)이기 때문에 트랜지스터 Q는 온된다. 따라서, 전류제어용 저항 R은 Rs1과 Rs2의 병렬연결에 따른 합성값이 되어 초기 동작시의 전류제어용 저항 R = Rs1보다 감소하게 되고, 이에 따라 출력전류 I0는 증가하여 정상전류를 공급한다.On the other hand, during normal operation, the transistor Q is turned on because the overvoltage protection signal OVP is high at 4-5V. Therefore, the current control resistor R becomes a combined value due to the parallel connection of Rs1 and Rs2, which is lower than the current control resistor R = Rs1 in the initial operation, and thus the output current I 0 increases to supply a steady current.

따라서, 초기 점등시 램프에 인가되는 출력 파워를 증가할 필요가 없기 때문에 트랜스포머의 마진을 크게 할 필요가 없다.Therefore, it is not necessary to increase the margin of the transformer since it is not necessary to increase the output power applied to the lamp during the initial lighting.

이상에서는 본 발명의 바람직한 실시예를 중심으로 설명하였지만, 본 발명의 정신을 벗어나지 않는 범위 내에서 다양한 변경이나 변형을 가할 수 있다. 따라서, 본 발명의 범위는 상기한 실시예에 국한되어서는 안되며, 이하에 서술되는 특허청구범위에 의해 결정되어야 한다.Although the above has been described with reference to the preferred embodiments of the present invention, various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the above embodiments, but should be determined by the claims described below.

이상에서 설명한 바와 같이, 본 발명에 따르면 초기 점등시에 램프에 인가되는 전류를 감소시킴으로써 출력 파워를 줄여 저온, 저전압에서도 안정적인 점등을 할 수 있다는 이점이 있다.As described above, according to the present invention, the output power is reduced by reducing the current applied to the lamp during initial lighting, and thus there is an advantage that stable lighting can be performed even at low temperature and low voltage.

Claims (2)

트랜스포머의 출력단에 다수개의 램프들이 병렬로 연결되는 병렬구동 인버터 회로에 있어서,In a parallel drive inverter circuit in which a plurality of lamps are connected in parallel to the output terminal of the transformer, 상기 트랜스포머 출력단에 병렬로 연결된 제 1 및 제 2 저항 중의 어느 하나에 컬렉터가 연결되고, 이미터가 접지되며, 상기 트랜스포머 출력단으로부터 검출되는 과전압 보호신호가 베이스에 인가되는 트랜지스터를 포함하는 것을 특징으로 하는 인버터의 저전압 점등 안정화회로.And a transistor connected to one of the first and second resistors connected in parallel to the transformer output terminal, the emitter is grounded, and an overvoltage protection signal detected from the transformer output terminal applied to the base. Low voltage lighting stabilization circuit of inverter. 제 1 항에 있어서, 상기 과전압 보호신호는 시간지연회로를 통하여 일정한 시간 지연후 상기 베이스에 인가되는 것을 특징으로 하는 인버터의 저전압 점등 안정화회로.The low voltage lighting stabilization circuit of claim 1, wherein the overvoltage protection signal is applied to the base after a predetermined time delay through a time delay circuit.
KR1020040076838A 2004-09-24 2004-09-24 Circuit for stabilizing low-voltage lighting of invertor KR100597205B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0922788A (en) * 1995-07-07 1997-01-21 Tec Corp Discharge lamp lighting device
JPH11162680A (en) 1997-11-27 1999-06-18 Toshiba Tec Corp Discharge-lamp lighting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0922788A (en) * 1995-07-07 1997-01-21 Tec Corp Discharge lamp lighting device
JPH11162680A (en) 1997-11-27 1999-06-18 Toshiba Tec Corp Discharge-lamp lighting device

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