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KR900010907Y1 - Static current led driving circuit - Google Patents

Static current led driving circuit Download PDF

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Publication number
KR900010907Y1
KR900010907Y1 KR2019860020464U KR860020464U KR900010907Y1 KR 900010907 Y1 KR900010907 Y1 KR 900010907Y1 KR 2019860020464 U KR2019860020464 U KR 2019860020464U KR 860020464 U KR860020464 U KR 860020464U KR 900010907 Y1 KR900010907 Y1 KR 900010907Y1
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South Korea
Prior art keywords
transistor
led
terminal
driving circuit
resistor
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KR2019860020464U
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KR880014134U (en
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김동윤
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삼성전자 주식회사
한형수
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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Abstract

내용 없음.No content.

Description

정전류 LED구동회로Constant Current LED Driving Circuit

제1도는 본 고안 정전류 LED구동회로의 회로도.1 is a circuit diagram of a constant current LED driving circuit of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

Remote : 리모트 콘트롤 R1∼R3: 저항Remote: Remote control R 1 to R 3 : Resistance

C1: 콘덴서 D1, D2: 다이오드C 1 : condenser D 1 , D 2 : diode

LED1, LED2: 발광다이오드 TR1, TR2: 트랜지스터LED 1 , LED 2 : light emitting diode TR 1 , TR 2 : transistor

본 고안은 TV에 이용되는 정전류 LED구동회로에 관한 것으로 특히 LED를 구동시키는 리모트 콘트롤의 출력신호를 제어하여 LED에 일정 전류가 흐르도록 함으로써 LED의 빛의 밝기를 일정하게 유지할 수 있도록 한 정전류 LED구동회로에 관한 것이다.The present invention relates to a constant current LED driving circuit used in a TV, and in particular, a constant current LED driving circuit that maintains a constant brightness of the LED by controlling the output signal of the remote control driving the LED so that a constant current flows through the LED. It's about the furnace.

종래의 LED구동회로에 있어서는 그 각 LED를 구동시키기 위하여 리모트콘트롤의 각 출력단자로부터 출력전압이 직접 공급되도록 되어 있었다.In the conventional LED driving circuit, an output voltage is directly supplied from each output terminal of the remote control in order to drive the respective LEDs.

따라서 출력 전압이 변동에 의해서 LED의 불밝기가 달라지거나 또는 불밝기가 주기적으로 변화함으로써 LED가 깜빡깜빡거리게 되는 문제점이 있었다.Therefore, there is a problem that the LED flickers by changing the output voltage or changing the light brightness of the LED periodically.

본 고안은 상기와 같은 결점을 해결하기 위하여 LED에 전류를 일정하게 흐르도록 함으로써 LED의 불밝기를 일정하게 한 것으로 이하 첨부된 도면에 의하여 본 고안을 상세히 설명하면 다음과 같다.The present invention is to make the brightness of the LED constant by allowing a constant current to flow through the LED to solve the above drawbacks described below in detail the present invention by the accompanying drawings.

리모트콘트롤(Remote)의 출력단자는 저항(R1)을 통하여 트랜지스트(TR1)의 베이스단자에 연결하고 그 트랜지스터(TR1)의 에미터 단자는 저항(R2)을 통하여 트랜지스터(TR2)의 베이스 단자에 연결함과 아울러 다이오드(D1)(D2)를 통하여 접지시키고 상기 트랜지스터(TR1)의 콜렉터 단자는 콘덴서(C1)를 통하여 전원전압(VDD)이 인가되도록 연결하며 상기 트랜지스터(TR2)의 콜렉터 단자는 발광다이오드(LED1)(LED2)를 통하여 전원전압(VDD)이 입력되도록 연결하고 그 트랜지스터(TR2)의 에미터단자는 저항(R3)을 통하여 접지시켜 된 것으로 도면중 미 설명부호 IC1은 트랜지스터(TR1)의 콜렉터에 흐르는 전류이고 IC2는 트랜지스터(TR2)의 콜렉터에 흐르는 전류이며 I1은 다이오드(D1)(D2)에 흐르는 전류이고 I2는 저항(R3)에 흐르는 전류이다.Transistor through a resistor (R 2) the emitter terminal of the An output terminal of the remote control (Remote) via the resistor (R 1) connected to the base terminal of the transfected registry (TR 1) and the transistor (TR 1) (TR 2) Is connected to the base terminal of the transistor and grounded through the diode D 1 and D 2 , and the collector terminal of the transistor TR 1 is connected so that the power supply voltage VDD is applied through the capacitor C 1 . the emitter terminal of the (TR 2) the collector terminal is a light emitting diode (LED 1) (LED 2) supply voltage (VDD) connected to the input and the transistor (TR 2) through the to the ground via a resistor (R 3) In the figure, reference numeral IC 1 is a current flowing through the collector of the transistor TR 1 , IC 2 is a current flowing through the collector of the transistor TR 2 , and I 1 is a current flowing through the diode D 1 (D 2 ). And I 2 is the current through resistor R 3 .

이와같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.

먼저 리모트콘트롤(Remote)의 출력단자로부터 하이신호가 트랜지스터(TR1)의 베이스단자에 인가되면 트랜지스터(TR1)는 온 되어 전원전압(VDD)은 콘덴서(C1) 및 트랜지스터(TR1)의 콜렉터와 에미터를 통하여 저항(R2)에 흐르게 되고 따라서 저항(R2)에는 전압강하(VA)가 걸리면서 다이오드(D1)(D2)를 통하여 흘러나게 되는 반면에 저항(R2)에 걸리는 전압(VA)이 트랜지스터(TR2)의 베이스 단자에 인가되므로 트랜지스터(TR2)는 온 상태가 되고 따라서 전원전압(VDD)은 발광다이오드(LED1)(LED2) 및 트랜지스터(TR2)의 콜렉터단자와 에미터단자를 통하여 저항(R3)을 거쳐 흐르게 된다.First, the remote control (Remote) when the output terminal is at a high signal applied to the base terminal of the transistor (TR 1) transistor (TR 1) is turned on the power source voltage (VDD) is a capacitor (C 1) and a transistor (TR 1) of on through the collector and emitter flows in the resistance (R 2) Thus, the resistance (R 2), the voltage drop (VA) geolrimyeonseo diode (D 1) against the other hand, is reminded to flow through the (D 2) (R 2) applied voltage (VA) is so applied to the base terminal of the transistor (TR 2) the transistor (TR 2) is in the oN state thus the power source voltage (VDD) is a light emitting diode (LED 1) (LED 2) and transistor (TR 2) It flows through the resistor (R 3 ) through the collector and emitter terminals of.

이때 상기 전압강하(VA)는 다이오드(D1)(D2)에 걸리는 전압(VD1)(VD2)으로 구성되므로 트랜지스터(TR2)의 베이스와 에미터 사이의 전압은 다이오드(D1)에 걸리는 (VD1)과 같다.At this time, the voltage drop (VA) is a diode (D 1) the voltage between the base and the emitter of the voltage (VD 1) transistor (TR 2), so configured as (VD 2) applied to the (D 2) is a diode (D 1) Is equal to (VD 1 ).

따라서 전압강하(VA)는 트랜지스터(TR2)의 베이스 전압이 같고 상기 다이오드(D2)의 전압(VD2)은 트랜지스터(TR2)의 에미터 전압과 같다.Therefore, the voltage drop VA is equal to the base voltage of the transistor TR 2 and the voltage VD 2 of the diode D 2 is equal to the emitter voltage of the transistor TR 2 .

그러므로 상기 트랜지스터(TR2)의 에미터에 흐르는 전류(I2)는이상 흐르지 못하게 하여 트랜지스터(TR2)의 에미터에 흐르는 전류(I2)는 일정하게 유지된다.Therefore, the current I 2 flowing in the emitter of the transistor TR 2 is The current I 2 flowing through the emitter of the transistor TR 2 is kept constant so as not to flow abnormally.

즉 에미터전류(I2)는 발광다이오드(LED1)(LED2)에 흐르는 전류(Ie2)와 같기 때문에 (I2 Ie2) 발광다이오드(LED1)(LED2)에 흐르는 전류가 일정하게 된다.That is, since the emitter current I 2 is equal to the current Ie 2 flowing through the light emitting diode LED 1 (LED 2 ), (I 2) Ie 2 ) The current flowing through the light emitting diode LED 1 (LED 2 ) becomes constant.

반면에 상기 에미터전류(I2)가이상이 되면 전류는 다이오드(D1)(D2)를 통하여 흘러버리게 된다.On the other hand, the emitter current I 2 If abnormal, current flows through the diode D 1 (D 2 ).

이상에서 설명한 바와 같이 본 고안은 리모트콘트롤로부터 출력된 신호를 트랜지스터를 제어하여 회로에 흐르는 전압을 저항 및 다이오드로 전하강화시켜 발광다이오드에 흐르는 전류를 일정하게 유지토록 함으로써 전압 변동에 따른 전류의 변화가 발생되지 않으므로 발광다이오드의 불밝기가 일정하게 할 수 있는 이점을 제공해 줄수 있는 것이다.As described above, the present invention controls the transistor to control the signal output from the remote control, thereby strengthening the voltage flowing through the circuit with a resistor and a diode to maintain a constant current flowing through the light emitting diode, thereby changing the current caused by the voltage variation. Since it is not generated, it is possible to provide an advantage that the light brightness of the light emitting diode can be made constant.

Claims (1)

리모트콘트롤(Remote)의 출력단자는 저항(R1)을 통하여 트랜지스터(TR1)의 베이스 단자에 연결하고 그 트랜지스터(TR1)의 에미터 단자는 저항(R2)을 통하여 트랜지스터(TR2)의 베이스 단자에 연결함과 아울러 다이오드(D1)(D2)를 통하여 접지하며 트랜지스터(TR1)의 콜렉터단자는 전원전압(VDD)이 콘덴서(C1)를 통하여 입력되게 연결하고 상기 트랜지스터(TR2)의 에미터 단자는 저항(R3)을 통하여 접지하며 그의 콜렉터 단자는 발광다이오드(LED1)(ELD2)를 통하여 전원전압(VDD)이 인가되도록 연결 구성한 것을 특징으로 하는 정전류 LED 구동회로.The output terminal of the remote control (Remote) is connected to the base terminal of the transistor TR 1 through the resistor R 1 and the emitter terminal of the transistor TR 1 is connected to the transistor TR 2 through the resistor R 2 . It is connected to the base terminal and grounded through the diode D 1 (D 2 ), and the collector terminal of the transistor TR 1 is connected so that the power supply voltage VDD is input through the capacitor C 1 and the transistor TR 2 ) the emitter terminal is grounded through the resistor (R 3 ) and its collector terminal is connected to the power supply voltage (VDD) through the light-emitting diode (LED 1 ) (ELD 2 ) is configured to be a constant current LED drive circuit .
KR2019860020464U 1986-12-18 1986-12-18 Static current led driving circuit Expired KR900010907Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019860020464U KR900010907Y1 (en) 1986-12-18 1986-12-18 Static current led driving circuit

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Application Number Priority Date Filing Date Title
KR2019860020464U KR900010907Y1 (en) 1986-12-18 1986-12-18 Static current led driving circuit

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KR880014134U KR880014134U (en) 1988-08-31
KR900010907Y1 true KR900010907Y1 (en) 1990-12-08

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Application Number Title Priority Date Filing Date
KR2019860020464U Expired KR900010907Y1 (en) 1986-12-18 1986-12-18 Static current led driving circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050045748A (en) * 2003-11-12 2005-05-17 (주)크레스라이트 Constant current circuit for light emitting diode

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