KR20010055888A - Power Supply For the Constant Luminescence of Light Emitting Diode Traffic Signal Lamp - Google Patents

Power Supply For the Constant Luminescence of Light Emitting Diode Traffic Signal Lamp Download PDF

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KR20010055888A
KR20010055888A KR1019990057211A KR19990057211A KR20010055888A KR 20010055888 A KR20010055888 A KR 20010055888A KR 1019990057211 A KR1019990057211 A KR 1019990057211A KR 19990057211 A KR19990057211 A KR 19990057211A KR 20010055888 A KR20010055888 A KR 20010055888A
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South Korea
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thermistor
led
light emitting
emitting diode
signal lamp
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KR1019990057211A
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Korean (ko)
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KR100345039B1 (en
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정학근
정봉만
한수빈
박석인
김규덕
유승원
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손재익
한국에너지기술연구원
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Led Devices (AREA)

Abstract

PURPOSE: A circuit for driving a light emitting diode signal lamp is provided to offer a stable optical output by controlling a driving current of an LED about a variety of temperature through a thermistor. CONSTITUTION: A resistance value of a thermistor(4) is varied according to a variety of an external temperature. Namely, when the external temperature is increased, the resistance value of the thermistor(4) is decreased, and the base voltage of a power transistor(T2) is increased. When the external temperature is decreased, the resistance value of the thermistor(4) is increased, and the base voltage of the power transistor(T2) is decreased. For this reason, the luminous intensity of the LED is sustained regularly.

Description

정광 출력 발광다이오드 신호등 구동회로 {Power Supply For the Constant Luminescence of Light Emitting Diode Traffic Signal Lamp}Concentrated output LED signal driver circuit {Power Supply For the Constant Luminescence of Light Emitting Diode Traffic Signal Lamp}

본 발명은 정광출력 발광다이오드(light emitting diode, 이하 LED라 한다) 신호등의 구동회로에 관한 것으로 보다 상세하게는 발광다이오드의 정전류 구동회로에 저가의 써미스터(thermister)를 구비하여 외부의 온도 변화에 따라 자동적으로 LED의 구동전류와 광출력이 변화하는 정광출력 LED 신호등 구동회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a driving circuit for a light emitting diode (LED) signal lamp. More particularly, a low-cost thermistor is provided in a constant current driving circuit of a light emitting diode, and according to an external temperature change. The present invention relates to a concentrated output LED signal lamp driving circuit in which the driving current and the light output of the LED change automatically.

일반적으로 LED 신호등은 저전력 소모, 장수명에 따라 외부온도의 변화에 관계없이 일정한 광출력을 유지해야 하지만 온도에 따라 밝기가 변화하는 특성이 있다.In general, LED traffic light should maintain a constant light output regardless of the change of the external temperature according to the low power consumption, long life, but the brightness is changing according to the temperature.

종래의 온도 변화에 상관없이 일정한 광출력을 내기 위한 LED 구동회로는 주위 온도나 LED의 광출력을 광센서에 의해 감지하여 LED의 구동전류나 전압을 제어하고 있으나 외부 온도에 영향을 받지 않는 광센서는 고가로서 이들로 구성된 제어회로는 설치비가 높아지는 단점이 있다. 또한 이러한 제어회로를 구성하기 위해서는 입력 교류를 직류로 변환함으로써 구동회로 손실률이 커지게 되어 ITE(Instit ute of Transportation Engineers)의 LED 신호등 잠정 규격서에 규정하고 있는 역률, THD(Total Harmonic Distortion) 요건을 충족시키기 어렵게 되므로 역률이나 THD 보상을 위해서는 또 다른 회로가 첨가되어야 하는 단점이 있다.LED driving circuit for producing constant light output regardless of the temperature change in the prior art senses ambient temperature or LED light output by light sensor to control LED driving current or voltage but is not affected by external temperature The high cost of the control circuit composed of these has the disadvantage that the installation cost is high. In addition, in order to construct such a control circuit, the input circuit is converted into direct current to increase the driving circuit loss rate, thereby satisfying the power factor and total harmonic distortion (THD) requirements specified in the provisional specification of LED signal lamps of the Institute of Transportation Engineers (ITE). This is difficult to make, so another circuit must be added for power factor or THD compensation.

종래의 정전류원 LED 구동회로는 주위 온도의 변화(-40℃∼74℃)에서 광출력이 40 ∼ 50% 정도 변동하고 있고, 온도센서나 광센서 신호를 궤환하여 광출력을 제어하는 회로는 가격이 상승하게 된다.In the conventional constant current source LED driving circuit, the light output fluctuates by 40 to 50% when the ambient temperature changes (-40 ° C to 74 ° C), and the circuit which controls the light output by feeding back the temperature sensor or the optical sensor signal is expensive. Will rise.

종래의 광센서를 사용하여 빛의 광도를 궤환하여 입력전압이나 입력전류를 조절하는 방법(United States Patent, Patent Number: 5,661,645, Date of Patent: Aug.26, 1997)은 있으나, 본 발명과 같이 써미스터의 특성을 이용하여 자동적으로 주위 온도에 따라 광도가 조절되도록 하는 방법은 아직까지 소개된 바 없다.There is a method of adjusting the input voltage or input current by feedback of the light intensity using a conventional optical sensor (United States Patent, Patent Number: 5,661,645, Date of Patent: Aug. 26, 1997), but thermistor as in the present invention The method of automatically adjusting the brightness according to the ambient temperature using the characteristic of has not been introduced until now.

본 발명은 정광출력 LED 구동기술은 정전류 구동회로의 트랜지스터의 에미터 저항 또는 베이스단에 써미스터를 사용함으로써 외부의 온도가 변화하면 써미스터의 저항값이 변하므로 자동적으로 LED의 구동전류를 변화하도록 하여 안정한 광출력을 내도록 함을 목적으로 한다.According to the present invention, the concentrate output LED driving technology uses a thermistor at the emitter resistance or the base of the transistor of the constant current driving circuit so that the resistance value of the thermistor changes when the external temperature changes, thereby automatically changing the driving current of the LED. It aims to produce light output.

도 1은 LED 어레이를 정전류로 구동시의 광도변화를 나타낸 그래프이다.1 is a graph showing the change in brightness when the LED array is driven with a constant current.

도 2는 에미터 저항에 써미스터가 병렬로 연결된 LED 신호등 구동회로이다.2 is an LED traffic light driver circuit in which a thermistor is connected in parallel to an emitter resistor.

도 3은 온도의 변동에 따른 써미스터의 저항변화를 나타낸 그래프이다.3 is a graph showing the resistance change of the thermistor according to the temperature change.

도 4는 써미스터를 이용한 전압제어 LED 신호등 구동회로이다.4 is a voltage control LED signal lamp driving circuit using a thermistor.

＜도면의 주요부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

1 : 교류 전원(110/220V) 2 : 변압기1: AC power supply (110 / 220V) 2: Transformer

3 : 정류기 4 : 써미스터(1, 2)3: rectifier 4: thermistor (1, 2)

5 : 저항(1, 2) 6 : 제너다이오드5: resistance (1, 2) 6: zener diode

7 : 에미터 저항 (1, 2, 3)7: emitter resistance (1, 2, 3)

본 발명은 입력 교류 전압(1)을 적정 크기의 맥류로 변환하는 변압기(2)와 정류기(3) 및 구성회로는 저항(5), 제너다이오드(6) 그리고 에미터 저항(7) 및 써미스터로 구성되어 온도의 변화에 따라 써미스터(4)의 저항치가 변하므로 주위온도에 따라 다이오드 어레이를 일정한 전류로 구동시켜 다이오드가 일정 출력을 유지하도록 한다.According to the present invention, a transformer (2), a rectifier (3), and a component circuit for converting an input AC voltage (1) into a pulse current of an appropriate magnitude may include a resistor (5), a zener diode (6), an emitter resistor (7) and a thermistor. Since the resistance value of the thermistor 4 changes according to the change in temperature, the diode is maintained at a constant current according to the ambient temperature so that the diode maintains a constant output.

다음은 본 발명의 구성 및 작용에 대하여 도면을 중심으로 보다 구체적으로설명하고자 한다.Next will be described in more detail with reference to the drawings for the configuration and operation of the present invention.

도 1은 LED 어레이를 정전류로 구동할 경우의 광도변화를 나타낸 것으로 25℃를 기준으로 하였을 때 외부온도가 75℃로 상승할 경우 광도가 45% 정도 감소하고 또한 외부온도가 -25℃로 하강하였을 때는 50% 정도 광도가 증가함을 알 수 있다.FIG. 1 shows the brightness change when the LED array is driven with a constant current. When the external temperature rises to 75 ° C based on 25 ° C, the brightness decreases by about 45% and the external temperature drops to -25 ° C. When the brightness is increased by about 50%.

도 2와 도 4는 일정 광출력 LED 신호등 구동 회로도로서 교류 입력 전압은 변압기와 정류기를 통하여 맥류로 변환된다. 그리고 저항, 제너다이오드 그리고 에미터 저항 및 써미스터로 구성되는 정전류 구동회로가 발광 다이오드(Light Emiting Diode)를 구동한다.2 and 4 are circuit diagrams for driving a constant light output LED traffic light, wherein an AC input voltage is converted into a pulse current through a transformer and a rectifier. In addition, a constant current driving circuit including a resistor, a zener diode, an emitter resistor, and a thermistor drives a light emitting diode.

도 2의 회로에서 변압기(2)와 정류기(3)는 입력 교류 전압(1)을 적정 크기의 맥류로 변환하는 기능을 한다. 저항(5), 제너다이오드(6), 트랜지스터(T) 그리고 에미터 저항(7)으로 구성된 구동회로는 에미터 저항값에 따라 발광 다이오드 어레이를 일정 전류로 구동시킨다. 이 회로는 써미스터(4)가 베이스단(Tb)과 에미터단( Te) 두곳에 사용되었다. 에미터단에 첨가된 써미스터의 저항이 온도에 따라 변화하는 데 온도가 상승하면 합성병렬 저항은 감소, 온도가 하강하면 합성병렬 저항은 증가하면서 구동전류를 변화시킨다. 또한 베이스단에 연결된 써미스터는 온도변화에 따라 온도가 상승하면 베이스 전압은 상승하고 온도가 하강하면 베이스 전압은 감소되도록 변동시켜 LED 구동전류를 변화시킨다. 이렇게 함으로써 LED 어레이의 광도를 외부온도의 변화에 관계없이 10% 이내의 범위내에서는 일정하게 유지시킬 수 있다. 그러나 이 회로는 써미스터의 허용전류가 낮기 때문에 LED 어레이를 각각구동하여야 한다.In the circuit of FIG. 2, the transformer 2 and the rectifier 3 function to convert the input AC voltage 1 into a pulse current of an appropriate magnitude. The driving circuit composed of the resistor 5, the zener diode 6, the transistor T and the emitter resistor 7 drives the LED array with a constant current according to the emitter resistance value. In this circuit, the thermistor (4) is used at the base stage (Tb) and the emitter stage (Te). The resistance of the thermistor added to the emitter stage changes with temperature. As the temperature rises, the compound parallel resistance decreases, and as the temperature decreases, the compound parallel resistance increases and the driving current changes. In addition, the thermistor connected to the base stage changes the LED driving current by changing the base voltage when the temperature increases with the temperature change and decreasing the base voltage when the temperature decreases. In this way, the brightness of the LED array can be kept constant within the range of 10% regardless of the change in the external temperature. However, this circuit requires a separate drive of the LED array because the thermistor has a low allowable current.

도 3은 온도변화에 따라 그 전기적 저항이 변화하는 써미스터의 특성 그래프이다. 온도 변화에 따라 그 전기적 저항 특성이 Log 스케일로 변화한다. 그러므로 저항과 병렬로 사용함으로써 그 변화율을 선형화하여 사용한다.3 is a characteristic graph of a thermistor whose electrical resistance changes with temperature change. As temperature changes, its electrical resistance changes on a log scale. Therefore, by using it in parallel with the resistance, the rate of change is linearized.

도 4는 써미스터(4)와 파워 트랜지스터(T2)를 이용한다. 외부온도의 변화에 따라 써미스터(4)의 저항값이 변동하여 외부온도가 상승하면 써미스터 저항이 감소하여 파워 트랜지스터의 베이스 전압이 증가하고 외부온도가 하강하면 파워 트랜지스터의 베이스전압이 상승되도록 변동시킨다. 이렇게 함으로써 LED 어레이의 광도를 외부온도의 변화에 관계없이 10% 이내의 범위내에서는 일정하게 유지시킬 수 있다. 써미스터를 파워 트랜지스터의 입력단(T2b)에 사용함으로써 써미스터의 허용전류가 낮은 단점을 보완하고 LED 어레이를 직·병렬하여 사용할 수 있다.4 uses thermistor 4 and power transistor T2. The resistance value of the thermistor 4 fluctuates according to the change of the external temperature, and when the external temperature rises, the thermistor resistance decreases to increase the base voltage of the power transistor, and when the external temperature falls, the base voltage of the power transistor increases. In this way, the brightness of the LED array can be kept constant within the range of 10% regardless of the change in the external temperature. By using the thermistor at the input terminal (T2b) of the power transistor, the low current allowance of the thermistor can be compensated for, and the LED array can be used in parallel.

본 발명은 정광출력 LED 구동기술은 정전류 구동회로의 트랜지스터의 에미터 저항 또는 베이스단에 써미스터를 사용함으로써 외부의 온도가 변화하면 써미스터의 저항값이 변하므로 자동적으로 LED의 구동전류를 변화하도록 하여 변동폭이 10% 이내의 광출력을 내도록 하며, 입력교류를 전파 정류만으로도 구동되므로 90% 이상의 역률과 40% 미만의 THD 요건을 충족시킬 수 있다. 또한 써미스터를 파워 트랜지스터의 입력단 (T2b)에 사용함으로써 써미스터의 허용전류가 낮은 단점을 보완하고 LED 어레이를 직·병렬하여 사용할 수 있다.According to the present invention, the concentrate output LED driving technology uses a thermistor at the base of the emitter resistor or the base of the transistor of the constant current driving circuit, so that the resistance value of the thermistor changes when the external temperature changes, so that the driving current of the LED is automatically changed. Its output power is less than 10%, and the input exchange is driven by full-wave rectification alone to meet power requirements above 90% and THD below 40%. In addition, by using the thermistor at the input terminal (T2b) of the power transistor, the low current limit of the thermistor can be compensated for, and the LED array can be used in parallel.

Claims (2)

발광다이오드 신호등 구동회로에 있어서, 입력 교류 전압(1)을 적정 크기의 맥류로 변환하는 변압기(2)와 정류기(3)가 구비되고, 저항(5), 제너다이오드(6) 및 트랜지스터(T)로 구성된 정전류 구동회로에 써미스터(4)를 구비하여 온도변화에 따라 저항값이 변하도록 하는 것을 특징으로 하는 정광 출력 발광다이오드 신호등 구동회로.In the LED signal drive circuit, a transformer (2) and a rectifier (3) for converting an input AC voltage (1) into a pulse current of an appropriate magnitude are provided and include a resistor (5), a zener diode (6), and a transistor (T). A constant current drive circuit comprising a thermistor (4) comprising a light output diode signal drive circuit for a light output diode, characterized in that the resistance value changes according to the temperature change. 제 1항에 있어서, 써미스터(4)는 베이스단(Tb) 또는 에미터단(Te)에 구비하는 것을 특징으로 하는 정광 출력 발광다이오드 신호등 구동회로.The light emitting diode signal lamp driving circuit according to claim 1, wherein the thermistor (4) is provided at a base end (Tb) or an emitter end (Te).
KR1019990057211A 1999-12-13 1999-12-13 Power Supply For the Constant Luminescence of Light Emitting Diode Traffic Signal Lamp KR100345039B1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
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KR20050045748A (en) * 2003-11-12 2005-05-17 (주)크레스라이트 Constant current circuit for light emitting diode
KR100774994B1 (en) * 2006-03-30 2007-11-09 서울반도체 주식회사 Temperature compensation type led display apparatus
KR100867361B1 (en) * 2008-07-03 2008-11-06 김용철 Led lamp circuit
KR100898819B1 (en) * 2007-09-10 2009-05-22 한국광기술원 Led driving circuit
KR101067976B1 (en) * 2009-02-23 2011-09-26 주식회사 케이이씨 Light Emitting Diode Driving Device
US8106602B2 (en) 2007-12-06 2012-01-31 Samsung Electronics Co., Ltd. Backlight assembly, display apparatus having the backlight assembly and method of preventing a current controller of the backlight assembly from being shut down
KR101240519B1 (en) * 2006-06-01 2013-03-08 엘지디스플레이 주식회사 driver circuit for Light Emitting Diodes back-light
KR20160106515A (en) * 2015-03-02 2016-09-12 에피스타 코포레이션 Led driver and illumination system related to the same
USRE48798E1 (en) 2015-03-02 2021-10-26 Epistar Corporation LED driver and illumination system related to the same

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CN111629487B (en) * 2015-03-02 2023-02-28 晶元光电股份有限公司 Driver of light emitting diode and related lighting system

Cited By (9)

* 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
KR100774994B1 (en) * 2006-03-30 2007-11-09 서울반도체 주식회사 Temperature compensation type led display apparatus
KR101240519B1 (en) * 2006-06-01 2013-03-08 엘지디스플레이 주식회사 driver circuit for Light Emitting Diodes back-light
KR100898819B1 (en) * 2007-09-10 2009-05-22 한국광기술원 Led driving circuit
US8106602B2 (en) 2007-12-06 2012-01-31 Samsung Electronics Co., Ltd. Backlight assembly, display apparatus having the backlight assembly and method of preventing a current controller of the backlight assembly from being shut down
KR100867361B1 (en) * 2008-07-03 2008-11-06 김용철 Led lamp circuit
KR101067976B1 (en) * 2009-02-23 2011-09-26 주식회사 케이이씨 Light Emitting Diode Driving Device
KR20160106515A (en) * 2015-03-02 2016-09-12 에피스타 코포레이션 Led driver and illumination system related to the same
USRE48798E1 (en) 2015-03-02 2021-10-26 Epistar Corporation LED driver and illumination system related to the same

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