KR20010096252A - Inverter for back light - Google Patents
Inverter for back light Download PDFInfo
- Publication number
- KR20010096252A KR20010096252A KR1020000020276A KR20000020276A KR20010096252A KR 20010096252 A KR20010096252 A KR 20010096252A KR 1020000020276 A KR1020000020276 A KR 1020000020276A KR 20000020276 A KR20000020276 A KR 20000020276A KR 20010096252 A KR20010096252 A KR 20010096252A
- Authority
- KR
- South Korea
- Prior art keywords
- pulse width
- width modulation
- inverter
- pwm
- circuit
- Prior art date
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Classifications
-
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
-
- 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
- H05B41/2821—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 single-switch converter or a parallel push-pull converter in the final stage
- H05B41/2824—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 single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
본 발명은 백라이트용 인버터에 관한 것으로서 특히, 권선형 트랜스포머를 이용하는 회로에서 펄스폭변조(PWM) 회로를 이용하여 램프의 밝기를 제어하는 백라이트용 인버터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight inverter, and more particularly, to a backlight inverter for controlling a brightness of a lamp using a pulse width modulation (PWM) circuit in a circuit using a winding transformer.
일반적으로 노트북 등과 같은 휴대용 전자기기의 경우에는 전력소모량을 줄여 배터리의 사용시간을 연장시키는 것이 무엇보다 중요하다. 이때, 전력소모의 대부분이 디스플레이 부분에서 이루어지기 때문에 액정디스플레이 소자(LCD)를 사용하는 장치에서는 그 백라이트(back light)의 밝기의 조정을 통해 전력소모를 줄이고자 하는 노력이 진행중이다.In general, in the case of portable electronic devices such as laptops, it is important to extend the battery life by reducing power consumption. At this time, since most of the power consumption is made in the display portion, an apparatus using a liquid crystal display device (LCD) is trying to reduce power consumption by adjusting the brightness of the back light.
기존의 경우, 펄스폭변조(PWM) 제어방식의 인버터에서는 저주파 구동시 LM393 IC의 Vcc 전원단자를 펄스폭변조(PWM) 신호로 제어하여 온/오프 구동함으로써 LCD 화면에서의 밝기를 조정하고 있다.In the conventional case, the pulse width modulation (PWM) controlled inverter controls the brightness of the LCD screen by driving the Vcc power terminal of the LM393 IC with a pulse width modulation (PWM) signal during low frequency driving.
이상에서 설명한 바와 같은 종래 기술의 백라이트용 인버터에서는 온/오프 동작 제어시 도 1에 도시된 바와 같이 출력 파형에 약간의 노이즈가 발생하기 때문에 LCD 화면에서의 상떨림 현상이 발생되는 문제점이 있다.In the backlight inverter of the related art as described above, a slight noise is generated in the output waveform as shown in FIG. 1 during the on / off operation control, which causes a problem of image blur in the LCD screen.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 그 목적은 펄스폭변조(PWM) 제어부의 위치를 변경하여 출력 파형에 포함되는 노이즈를 제거할 수 백라이트용 인버터를 제공하는데 있다.The present invention has been made to solve the above problems, an object of the present invention is to provide an inverter for backlight that can remove the noise included in the output waveform by changing the position of the pulse width modulation (PWM) control unit.
또한, 본 발명의 다른 목적은 저주파를 이용한 펄스폭변조(PWM) 제어시 전류 피드백 부분에 펄스폭변조(PWM) 신호를 연결하여 온/오프 듀티(duty)를 조절함으로써 램프의 밝기를 조절할 수 있는 백라이트용 인버터를 제공하는데 있다.In addition, another object of the present invention is to control the brightness of the lamp by connecting the pulse width modulation (PWM) signal to the current feedback portion when controlling the pulse width modulation (PWM) using a low frequency to control the brightness of the lamp An inverter for a backlight is provided.
도 1은 종래 기술에 의한 인버터에서 온/오프 동작시 노이즈가 포함된 출력 파형을 나타내는 파형도,1 is a waveform diagram illustrating an output waveform including noise during an on / off operation in an inverter according to the prior art;
도 2는 본 발명의 실시예에 의한 백라이트용 인버터의 회로 구성을 나타내는 회로도,2 is a circuit diagram showing a circuit configuration of a backlight inverter according to an embodiment of the present invention;
도 3은 본 발명에 의한 인버터에서 온/오프 동작시 노이즈가 제거된 출력 파형을 나타내는 파형도.3 is a waveform diagram illustrating an output waveform from which noise is removed during an on / off operation in an inverter according to the present invention.
상기와 같은 목적을 달성하기 위한 본 발명의 특징에 따르면, 권선형 트랜스포머를 이용하는 회로에서 펄스폭변조(PWM) 회로를 이용하여 램프의 밝기를 제어하는 백라이트용 인버터에 있어서, 저주파를 이용한 펄스폭변조(PWM) 제어시 전류 피드백 부분에 펄스폭변조(PWM) 신호를 연결하여 온/오프 듀티(duty)를 조절하는 백라이트용 인버터를 제공한다.According to a feature of the present invention for achieving the above object, in the inverter for backlight to control the brightness of the lamp using a pulse width modulation (PWM) circuit in a circuit using a winding transformer, pulse width modulation using a low frequency Provides a backlight inverter that controls the on / off duty by connecting a pulse width modulation (PWM) signal to the current feedback portion during (PWM) control.
본 발명의 상술한 목적과 여러 가지 장점은 이 기술분야에 숙련된 사람들에 의해, 첨부된 도면을 참조하여 후술되는 본 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 present invention described below with reference to the accompanying drawings by those skilled in the art.
이하, 본 발명에 의한 백라이트용 인버터의 바람직한 실시예를 첨부도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of a backlight inverter according to the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 실시예에 의한 인버터의 회로 구성을 나타내는 회로도이고, 도 3은 본 발명에 의한 인버터에서 노이즈가 제거된 출력 파형을 나타내는 파형도이다.FIG. 2 is a circuit diagram showing a circuit configuration of an inverter according to an embodiment of the present invention, and FIG. 3 is a waveform diagram showing an output waveform from which noise is removed in the inverter according to the present invention.
도 2를 참조하면, 기존방식과 다르게 펄스폭변조(PWM) 제어부를 전류 피드백 단자 부분에 연결하여 펄스폭변조(PWM) 신호의 온/오프 동작시 발생하던 노이즈를 최소화할 수 있도록 하였다.Referring to FIG. 2, unlike the conventional method, a pulse width modulation (PWM) control unit is connected to a current feedback terminal to minimize noise generated during on / off operation of a pulse width modulation (PWM) signal.
본 발명에 의한 백라이트용 인버터의 출력 파형은 도 3에 도시된 바와 같이 노이즈가 제거된 상태가 되는데, 출력 파형의 기울기는 도 2의 참조번호 C로 제시된 커패시터의 용량값을 조절함으로써 결정된다. 이때, 상기 기울기를 조절함에 따라 소프트 스타트(soft start)를 할 수 있게 된다.The output waveform of the backlight inverter according to the present invention is in a state where noise is removed as shown in FIG. 3, and the slope of the output waveform is determined by adjusting the capacitance value of the capacitor indicated by reference numeral C of FIG. 2. At this time, the soft start can be performed by adjusting the inclination.
결국, 상기 도 3에 도시된 바와 같이 출력 파형을 개선함으로써 LCD 화면에서의 상떨림 또는 잔잔하게 흐르는 노이즈 성분을 제거할 수 있게 된다.As a result, by improving the output waveform as shown in FIG. 3, it is possible to remove an image blur or a quietly flowing noise component on the LCD screen.
본 발명은 특정의 실시예와 관련하여 도시 및 설명하였지만, 첨부된 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 with respect to particular embodiments, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the appended claims. Anyone can grow up easily.
이상에서 설명한 바와 같은 본 발명의 백라이트용 인버터는 전류 피드백 부분에 펄스폭변조(PWM) 신호를 연결하고 온/오프 듀티(duty)를 조절하여 램프의 밝기를 조절함으로써 기존 방식에서 온/오프 동작시 발생하던 노이즈를 최소화시킬 수 있게 되고, 그에 따라 LCD 화면에서의 상떨림 현상을 없앨 수 있는 효과가 있다.As described above, the backlight inverter of the present invention connects a pulse width modulation (PWM) signal to the current feedback portion and adjusts the on / off duty to control the brightness of the lamp, thereby turning on and off the conventional method. It is possible to minimize the noise generated, thereby eliminating the image blur phenomenon on the LCD screen.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000020276A KR20010096252A (en) | 2000-04-18 | 2000-04-18 | Inverter for back light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000020276A KR20010096252A (en) | 2000-04-18 | 2000-04-18 | Inverter for back light |
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| Publication Number | Publication Date |
|---|---|
| KR20010096252A true KR20010096252A (en) | 2001-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020000020276A KR20010096252A (en) | 2000-04-18 | 2000-04-18 | Inverter for back light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100794146B1 (en) * | 2006-10-12 | 2008-01-17 | 주식회사 엘 앤 에프 | Apparatus and method for driving light emitting diode |
-
2000
- 2000-04-18 KR KR1020000020276A patent/KR20010096252A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100794146B1 (en) * | 2006-10-12 | 2008-01-17 | 주식회사 엘 앤 에프 | Apparatus and method for driving light emitting diode |
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