KR101228924B1 - VCC circuit of inverter for LCD Backlight - Google Patents
VCC circuit of inverter for LCD Backlight Download PDFInfo
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- KR101228924B1 KR101228924B1 KR1020060047245A KR20060047245A KR101228924B1 KR 101228924 B1 KR101228924 B1 KR 101228924B1 KR 1020060047245 A KR1020060047245 A KR 1020060047245A KR 20060047245 A KR20060047245 A KR 20060047245A KR 101228924 B1 KR101228924 B1 KR 101228924B1
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- 239000003990 capacitor Substances 0.000 claims description 7
- 230000020169 heat generation Effects 0.000 claims 1
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- 238000010586 diagram Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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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
- H05B41/282—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
- H05B41/2822—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 specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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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
- H05B41/282—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
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
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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
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- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
본 발명은 외부로부터 입력되는 소정레벨의 전압을 회로에서 요구하는 레벨의 전압으로 변환하여 출력하는 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PCC circuit of an LCD backlight inverter which converts a voltage of a predetermined level input from the outside into a voltage of a level required by a circuit and outputs the same.
본 발명은 입력전압으로부터 소정 레벨을 갖는 제너 전압을 검출하기 위한 제너 다이오드와; 상기 제너 다이오드의 상기 제너 전압을 기준으로 하여, 상기 입력전압을 소정 레벨로 조정하여 출력하는 전압 조정소자를 포함한다.The present invention provides a Zener diode for detecting a Zener voltage having a predetermined level from an input voltage; And a voltage adjusting element for adjusting the input voltage to a predetermined level based on the zener voltage of the zener diode.
본 발명은 종래의 레귤레이터에 사용되는 기준전압 발생기와 오차 증폭기 등의 소자를 제거하고, 제너 다이오드와 트랜지스터로 이루어진 간단한 회로를 이용하여 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로를 구성함으로써, ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로의 구성에 따른 비용을 절감하고, 회로구성에 소요되는 시간을 절약할 수 있다.The present invention eliminates elements such as reference voltage generators and error amplifiers used in conventional regulators, and configures the PCC circuit of an LCD backlight inverter by using a simple circuit composed of a zener diode and a transistor, thereby providing a PCC of an inverter for an LCD backlight. The cost of the circuit configuration can be reduced, and the time required for the circuit configuration can be saved.
ＶＣＣ, 제너 다이오드, 트랜지스터, 제너 전압 BC, Zener Diode, Transistor, Zener Voltage
Description
도 1은 종래의 ＶＣＣ회로의 일예로서, 레귤레이터 회로도.1 is a regulator circuit diagram as an example of a conventional BCC circuit.
도 2는 본 발명에 의한 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로도.2 is a circuit diagram of a PCC of an inverter for an LCD backlight according to the present invention.
＜도면의 주요부분에 사용된 부호의 설명＞<Description of the code used in the main part of the drawing>
Vin: 입력전압 Vout: 출력전압Vin: Input Voltage Vout: Output Voltage
101~103: 저항군 C1, C2: 평활 컨덴서101-103: resistance group C1, C2: smoothing capacitor
ZD1: 제너 다이오드 Q1: 트랜지스터ZD1: Zener Diode Q1: Transistor
본 발명은 외부로부터 입력되는 소정레벨의 전압을 회로에서 요구하는 레벨의 전압으로 변환하여 출력하는 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로에 관한 것이다. BACKGROUND OF THE
일반적으로 ＶＣＣ회로란, 외부에서 입력되는 소정레벨의 전압을 시스템(혹은 부하가 연결되는 회로 등)에서 요구하는 레벨의 전압으로 변환하여 출력하는 회로를 말하며, 통상 레귤레이터(Regulator)회로 혹은 집적회로(IC) 형태의 레귤레이터 가 주로 사용된다.In general, a PCC circuit refers to a circuit that converts a voltage of a predetermined level input from the outside into a voltage of a level required by a system (or a circuit to which a load is connected), and outputs the voltage. A regulator circuit or an integrated circuit ( IC) type regulators are mainly used.
도 1은 종래의 레귤레이터를 도시한 도면이다.1 is a view showing a conventional regulator.
즉, 종래의 레귤레이터는, 도 1에 도시된 바와 같이, 입력전압(Vin)으로부터 기준 전압을 발생시키는 기준전압 발생기(10)와, 기준전압 발생기(10)에서 생성된 기준전압과 출력전압(Vout)의 전압차를 검출하는 오차 증폭기(Amp1)와, 오차 증폭기(Amp1)의 출력에 의해 입력전압(Vin)의 바이패스 상태가 스위칭되는 스위칭 소자(20)와, 입력전압(Vin)을 소정레벨의 출력전압(Vout)으로 분압(전압 조정)하기 위한 분압 저항(R1, R2)으로 구성된다.That is, the conventional regulator, as shown in Figure 1, the
그러나, 레귤레이터회로를 채용한 종래의 ＶＣＣ회로는 기준전압을 발생하기 위한 수단인 기준전압 발생기와, 이 기준전압 발생기에서 출력된 기준전압과 출력단으로 출력되는 출력전압을 비교하여 그 오차를 검출하기 위한 수단인 오차증폭기 등이 필요하며, 이로 인해 회로가 복잡해지고, 부품의 가격이 상승하는 문제점이 있다.However, the conventional DC circuit employing a regulator circuit compares a reference voltage generator, which is a means for generating a reference voltage, with a reference voltage output from the reference voltage generator and an output voltage output to an output terminal, and detects an error thereof. An error amplifier, which is a means, is required, which causes a problem in that the circuit becomes complicated and the price of parts increases.
본 발명은 구성이 간단하고 가격이 저렴한 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로를 제공함에 있다.SUMMARY OF THE INVENTION The present invention is to provide a PCC circuit of an LCD backlight inverter with a simple configuration and low cost.
본 발명은 입력단자에 연결되어 입력전압으로부터 소정 레벨을 갖는 제너 전압을 검출하기 위한 제너 다이오드와; 상기 제너 다이오드의 상기 제너 전압을 기준으로 하여, 상기 입력전압을 소정 레벨로 조정하여 출력하는 전압 조정소자를 포함한다.The present invention includes a Zener diode connected to an input terminal for detecting a Zener voltage having a predetermined level from the input voltage; And a voltage adjusting element for adjusting the input voltage to a predetermined level based on the zener voltage of the zener diode.
여기서, 상기 전압 조정소자는, 상기 제너 전압을 베이스로 입력받고, 상기 입력전압을 컬렉터로 입력받으며, 상기 베이스에 걸리는 제너 전압 레벨에 따라 상기 입력전압을 소정 레벨로 조정하여 이미터로 출력하는 트랜지스터를 포함하는 것이 바람직하다.Here, the voltage adjusting element is a transistor for receiving the zener voltage as a base, the input voltage to the collector, and adjusts the input voltage to a predetermined level according to the zener voltage level applied to the base to output to the emitter It is preferable to include.
이때, 상기 입력단자와 상기 트랜지스터의 컬렉터 사이에, 적어도 하나 이상의 저항이 직/병렬 연결된 발열 방지용 저항군을 더 포함할 수도 있다.At this time, between the input terminal and the collector of the transistor, at least one resistor may further include a heat generating prevention group connected in series / parallel.
또한, 상기 입력단자와 상기 제너 다이오드 사이에, 상기 입력전압의 리플성분을 제거하기 위한 리플 제거용 컨덴서를 더 포함할 수도 있다.The apparatus may further include a ripple removing capacitor for removing the ripple component of the input voltage between the input terminal and the zener diode.
이하, 본 발명의 바람직한 실시 예(들)에 대하여 첨부도면을 참조하여 상세히 설명한다. 우선 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호로 표기되었음에 유의하여야 한다. Hereinafter, exemplary embodiment (s) of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings.
또한, 하기의 설명에서는 구체적인 회로의 구성소자 등과 같은 많은 특정사 항들이 도시되어 있는데, 이는 본 발명의 보다 전반적인 이해를 돕기 위해서 제공된 것일 뿐 이러한 특정 사항들 없이도 본 발명이 실시될 수 있음은 이 기술분야에서 통상의 지식을 가진 자에게는 자명하다 할 것이다. In addition, in the following description there are shown a number of specific features, such as components of a specific circuit, which are provided to help a more comprehensive understanding of the invention, the invention may be practiced without these specific details It will be obvious to those of ordinary skill in the field.
도 2는 본 발명에 의한 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로도이다.2 is a circuit diagram of a PCC of an inverter for an LCD backlight according to the present invention.
도 2를 참조하면, 입력단자와 접지 사이에는 수개의 저항으로 연결된 저항군 1(101)과 리플성분 제거용 평활 컨덴서(C1)가 직렬 연결되고, 상기 저항군 1(101)과 평활 컨덴서(C1) 사이에는 제너 다이오드(ZD1)의 캐소드가 접속되며, 제너 다이오드(ZD1)의 애노드는 접지된다.Referring to FIG. 2, a resistor group 1 (101) connected by several resistors and a ripple component removing smoothing capacitor (C1) are connected in series between the input terminal and ground, and between the resistor group 1 (101) and the smoothing capacitor (C1). The cathode of Zener diode ZD1 is connected to, and the anode of Zener diode ZD1 is grounded.
또한, 전압 조정소자인 트랜지스터(Q1)의 베이스는 제너 다이오드(ZD1)의 캐소드와 공통 접속되고, 트랜지스터(Q1)의 컬렉터는 다수의 저항으로 구성된 저항군 2(102) 및 저항군 3(103)과 리플성분 제거용 평활 컨덴서(C2)에 연결된다.In addition, the base of the transistor Q1, which is a voltage adjusting element, is commonly connected to the cathode of the Zener diode ZD1, and the collector of the transistor Q1 has a resistance group 2 (102) consisting of a plurality of resistors and a resistance group 3 (103) and a ripple. It is connected to the smoothing capacitor (C2) for component removal.
또한, 트랜지스터(Q1)의 이미터는 출력단자에 연결된다.In addition, the emitter of transistor Q1 is connected to the output terminal.
이와 같은 구성을 갖는 본 발명의 동작을 설명하면 다음과 같다.Referring to the operation of the present invention having such a configuration as follows.
입력단자로부터 입력된 입력전압(Vin)은 컨덴서(C1)를 통해 리플성분이 제거된 후 제너 다이오드(ZD1)의 캐소드에 공급된다. 이때, 제너 다이오드(ZD1)의 캐소드에 걸리는 전압이 제너 다이오드(ZD1)의 제너 전압 이상인 경우, 제너 전압의 초과분은 모두 그라운드로 패스되고, 따라서, 트랜지스터(Q1)의 베이스에는 제너 전압에 해당하는 전위(예를 들면, 6.2[V])가 걸리게 된다. 여기서, 트랜지스터(Q1)의 베이스에 걸리는 전압은 입력전압의 레벨이 변하더라도, 제너 다이오드(ZD1)에 의해 항상 일정한 전위를 유지하게 된다.The input voltage Vin input from the input terminal is supplied to the cathode of the zener diode ZD1 after the ripple component is removed through the capacitor C1. At this time, when the voltage applied to the cathode of the zener diode ZD1 is equal to or greater than the zener voltage of the zener diode ZD1, all of the excess of the zener voltage is passed to ground, and thus, the potential corresponding to the zener voltage at the base of the transistor Q1. (For example, 6.2 [V]). Here, the voltage across the base of the transistor Q1 is always maintained at a constant potential by the zener diode ZD1 even if the level of the input voltage changes.
트랜지스터(Q1)의 베이스에 제너 전압에 해당하는 전위가 걸리면 트랜지스터(Q1)는 도통되고, 입력전압(Vin)으로부터 저항군 2(102) 및 저항군 3(103)에 의해 분압된 후 트랜지스터(Q1)의 컬렉터에 공급된 전압은 트랜지스터(Q1)의 베이스 전압에 따라 소정 레벨로 증폭되어 이미터로 출력된다. 이때, 트랜지스터(Q1)의 베이스에 항상 일정한 전압이 걸리므로, 트랜지스터(Q1)의 이미터에는 소정 레벨을 갖는 출력전압(Vout)(예를 들면, 5.5[V])이 출력된다.When a potential corresponding to the zener voltage is applied to the base of the transistor Q1, the transistor Q1 is turned on, and is divided by the resistor group 2 102 and the resistor group 3 103 from the input voltage Vin, and then the transistor Q1 The voltage supplied to the collector is amplified to a predetermined level according to the base voltage of the transistor Q1 and output to the emitter. At this time, since a constant voltage is always applied to the base of the transistor Q1, an output voltage Vout (for example, 5.5 [V]) having a predetermined level is output to the emitter of the transistor Q1.
한편, 제너 다이오드(ZD1)의 제너 전압을 변경하면, 트랜지스터(Q1)의 베이스에 걸리는 전압은 변화되고, 이에 따라 출력전압(Vout)도 변화된다. 따라서, 회로의 설계에 따라 제너 다이오드(ZD1)를 교체하면 원하는 레벨의 출력전압을 얻을 수 있다.On the other hand, when the zener voltage of the zener diode ZD1 is changed, the voltage applied to the base of the transistor Q1 is changed, and thus the output voltage Vout is also changed. Therefore, if the Zener diode ZD1 is replaced according to the design of the circuit, an output voltage having a desired level can be obtained.
한편, 본 발명에서, 다수의 저항으로 이루어진 저항군 2 및 저항군 3은 하나의 저항으로 대체하여 구성하여도 무방하며, 발열문제를 해결하기 위해, 본 발명에서와 같이 다수개의 저항을 조합하여 구성하는 것이 바람직하다.On the other hand, in the present invention, the resistance group 2 and the resistance group 3 consisting of a plurality of resistors may be configured by replacing one resistor, in order to solve the heat problem, it is to configure a combination of a plurality of resistors as in the present invention desirable.
또한, 본 발명에서, 전압을 조정하기 위한 소자로 npn형 트랜지스터를 일예로 설명하였으나, 회로의 구성에 따라 pnp형 트랜지스터, FET 등의 소자로 대체하여 구성할 수도 있다.In addition, in the present invention, the npn type transistor is described as an example of the device for adjusting the voltage. However, the pn type transistor, the FET, or the like may be replaced according to the circuit configuration.
이와 같이 본 발명은 LCD(Liquid Crystal Device: 액정표시소자)의 백라이트에 사용되는 인버터 등의 전원 공급장치에서, 외부로부터 입력되는 소정레벨의 전 압을 회로에서 요구하는 레벨의 전압으로 변환하여 출력할 수 있다.As described above, the present invention converts a voltage of a predetermined level input from the outside into a voltage of a level required by a circuit in a power supply device such as an inverter used for a backlight of an LCD (Liquid Crystal Device). Can be.
이와 같이, 본 발명의 상세한 설명에서는 구체적인 실시 예(들)에 관해 설명하였으나, 본 발명의 범주에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다. 그러므로 본 발명의 범위는 설명된 실시 예(들)에 국한되어 정해져서는 안 되며, 후술하는 특허청구범위 뿐만 아니라 이 특허청구범위와 균등한 것들에 의해 정해져야 한다.As described above, in the detailed description of the present invention, specific embodiment (s) have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiment (s), but should be defined by the claims below and equivalents thereof.
본 발명은 종래의 레귤레이터에 사용되는 기준전압 발생기와 오차 증폭기 등의 소자를 제거하고, 제너 다이오드와 트랜지스터로 이루어진 간단한 회로를 이용하여 ＬＣＤ 백라이트용 인버터의 ＶＣＣ 회로를 구성함으로써, ＶＣＣ회로의 구성에 따른 비용을 절감하고, 회로구성에 소요되는 시간을 절약할 수 있다.The present invention eliminates elements such as reference voltage generators and error amplifiers used in conventional regulators, and configures the PCC circuit of the LCD backlight inverter by using a simple circuit composed of a zener diode and a transistor, thereby forming a PCC circuit. The cost can be reduced and the time required for the circuit configuration can be saved.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR200214576Y1 (en) | 2000-09-19 | 2001-02-15 | 한국통신주식회사 | the power circuit of a CCD camera |
| JP2001292537A (en) * | 2000-01-31 | 2001-10-19 | Toshiba Lighting & Technology Corp | Charging circuit, emergency lighting circuit, and emergency lighting fixture |
| KR100661087B1 (en) | 2002-12-09 | 2006-12-26 | 엘지이노텍 주식회사 | Protection circuit of inverter for lcd back-light |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001292537A (en) * | 2000-01-31 | 2001-10-19 | Toshiba Lighting & Technology Corp | Charging circuit, emergency lighting circuit, and emergency lighting fixture |
| KR200214576Y1 (en) | 2000-09-19 | 2001-02-15 | 한국통신주식회사 | the power circuit of a CCD camera |
| KR100661087B1 (en) | 2002-12-09 | 2006-12-26 | 엘지이노텍 주식회사 | Protection circuit of inverter for lcd back-light |
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