KR20100054020A - Dual mode led driving device - Google Patents

Dual mode led driving device Download PDF

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KR20100054020A
KR20100054020A KR1020080112937A KR20080112937A KR20100054020A KR 20100054020 A KR20100054020 A KR 20100054020A KR 1020080112937 A KR1020080112937 A KR 1020080112937A KR 20080112937 A KR20080112937 A KR 20080112937A KR 20100054020 A KR20100054020 A KR 20100054020A
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transistor
voltage
switching
unit
dual mode
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KR1020080112937A
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KR100969876B1 (en
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한수정
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(주)아이피피
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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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)
  • Led Devices (AREA)

Abstract

PURPOSE: A dual mode LED driving device is provided to prevent damage by reducing stress to a transistor through control the transistor with a switching method or a linear method. CONSTITUTION: A driving part is comprised of a transistor(Q10) and an inductor(L10). An LED lamp(LED10) is comprised of a plurality of LEDs. Transistor passes through the input voltage in order to operate the LED lamp. The inductor charges energy in the operation of the transistor. The inductor supplies the energy to the LED lamp in operation of transistor. A dual mode control unit(10) senses the input side and output side voltage of the driving part. The dual mode control unit controls the transistor with a switching method and a linear method according to the voltage difference of input and output terminal.

Description

듀얼모드 엘이디 구동장치{Dual mode LED driving device}Dual mode LED driving device

본 발명은 듀얼모드 엘이디 구동장치에 관한 것으로서, 특히 LED램프로 구동전압을 공급하는 구동부의 입력측과 출력측 전압을 감지하여 그 입출력측 전압 차이에 따라 구동부를 구성하는 트랜지스터를 스위칭(Switching)방식 또는 리니어(Linear)방식으로 제어하여 스위칭소자인 트랜지스터에 가해지는 스트레스를 줄여주면서 발열량을 줄여주어 트랜지스터의 파손을 방지하고, 큰 정격의 스위칭소자를 사용하지 않아도 되므로 제품의 생산단가를 현저히 낮춰줄 수 있도록 한 듀얼모드 엘이디 구동장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual mode LED driving device. In particular, the input and output side voltages of a driving unit for supplying driving voltages with LED lamps are sensed and switching transistors or linear transistors constituting the driving unit according to the input / output side voltage difference thereof. By controlling by (Linear) method, the stress on the transistor, which is a switching element, reduces the amount of heat generated, thus preventing the breakage of the transistor and reducing the production cost of the product by eliminating the use of a large rated switching element. It relates to a dual mode LED drive device.

도 1 과 도 2 는 종래의 LED 구동장치를 도시한 것이다.1 and 2 show a conventional LED driver.

LED 구동장치는 그 방식에 따라 스위칭(Switching)방식과 리니어(Linear)방식으로 구별된다.The LED driver is divided into a switching method and a linear method according to the method.

도 1 은 종래의 스위칭 방식 LED 구동장치를 도시한 것으로서, 1 illustrates a conventional switching type LED driving device,

다수의 LED로 이루어진 LED램프(LED)를 구동시키기 위하여 입력전압(Vin)을 선택적으로 통과시키는 트랜지스터(Q1)와, 상기 트랜지스터(Q1)의 온동작시 에너지 를 충전하고 트랜지스터(Q1)가 오프될때 축적된 에너지를 프리휠링 다이오드(DF)의 프리휠링(Free-Wheeling) 동작에 따라 LED램프(LED)로 공급하는 인덕터(L)로 구성된 구동부를 포함하고,In order to drive the LED lamp (LED) consisting of a plurality of LEDs, the transistor Q1 selectively passes the input voltage Vin, and when the transistor Q1 is charged with energy and the transistor Q1 is turned off. It includes a drive unit consisting of an inductor (L) for supplying the accumulated energy to the LED lamp (LED) in accordance with the free-wheeling operation of the freewheeling diode (DF),

LED램프(LED)에 흐르는 전류를 감지하여 기준전압(Vref)과 비교하고, 그 비교결과를 출력하는 비교기(1)와,A comparator (1) which senses a current flowing in the LED lamp (LED) and compares it with a reference voltage (Vref), and outputs the comparison result,

상기 비교기(1)의 비교결과에 따라 트랜지스터(Q1)의 온타임 듀티(Duty)를 조절하기 위한 펄스폭변조된 제어신호(PWM제어신호)를 트랜지스터(Q1)로 공급하는 PWM콘트롤러(2)로 구성된다.In accordance with the comparison result of the comparator 1 to the PWM controller 2 for supplying a pulse width modulated control signal (PWM control signal) for adjusting the on-time duty of the transistor (Q1) to the transistor (Q1) It is composed.

이와같이 구성되는 종래의 스위칭 방식 LED 구동장치는 PWM콘트롤러(2)에서 출력되는 PWM제어신호에 의해 트랜지스터(Q1)가 온/오프 동작하게되고, 상기 트랜지스터(Q1)가 온동작할때 인덕터(L)에 에너지가 축적되고, 상기 트랜지스터(Q1)가 오프되면 인덕터(L)에 축적된 에너지가 프리휠링 다이오드(DF)의 프리휠링 동작에 의해 LED램프(LED)로 공급된다.In the conventional switching type LED driving device configured as described above, the transistor Q1 is turned on / off by the PWM control signal output from the PWM controller 2, and the inductor L is turned on when the transistor Q1 is turned on. When energy is accumulated in the transistor Q1 and the transistor Q1 is turned off, the energy stored in the inductor L is supplied to the LED lamp LED by the freewheeling operation of the freewheeling diode DF.

상기 트랜지스터(Q1)는 전체주기를 T라 할때, 온타임(On Time) 주기 D는 '출력전압(Vout)/입력전압(Vin)'에 의해 결정된다.When the transistor Q1 is referred to as T, the on time period D is determined by the output voltage Vout / input voltage Vin.

따라서, 트랜지스터(Q1)의 온타임은 DT이고, 오프타임은 (1-D)T 이다.Therefore, the on time of the transistor Q1 is DT and the off time is (1-D) T.

상기 트랜지스터(Q1)가 온동작중일때(온타임구간) 인덕터(L)에 에너지가 축적됨과 동시에 LED램프(LED)에 전류가 흐르게되고, 상기 트랜지스터(Q1)가 오프동작중일때(오프타임구간)에는 인덕터(L)에 축적된 에너지가 프리휠링 다이오드(DF)에 의해 LED램프(LED)로 공급되어 LED램프(LED)가 점등 제어되는 것이다.When the transistor Q1 is in an on operation (on time period), energy is accumulated in the inductor L and a current flows in the LED lamp LED, and when the transistor Q1 is in an off operation (off time period). ), The energy stored in the inductor L is supplied to the LED lamp LED by the freewheeling diode DF so that the LED lamp LED is controlled to be turned on.

한편, 상기 도 2 는 종래 리니어방식 LED 구동장치를 도시한 것으로서,On the other hand, Figure 2 shows a conventional linear LED driver,

다수의 LED로 이루어진 LED램프(LED)를 구동시키기 위하여 능동영역에서 동작하여 LED램프(LED)의 구동에 필요한 정전류를 공급하는 트랜지스터(Q2)로 구성된 구동부를 포함하고,It includes a drive unit consisting of a transistor (Q2) for supplying a constant current required for driving the LED lamp (LED) by operating in the active area to drive the LED lamp (LED) consisting of a plurality of LED,

LED램프(LED)에 흐르는 전류를 감지하여 기준전압(Vref)과 비교하고, 그 비교결과에 따라 상기 트랜지스터(Q2)를 능동영역에서 구동시키는 비교기(3)를 더 포함하여 구성된다.It further comprises a comparator (3) for sensing the current flowing in the LED lamp (LED) to compare with the reference voltage (Vref), and according to the comparison result to drive the transistor (Q2) in the active region.

이와같이 구성된 리니어방식 LED구동장치는 비교기(3)에서 비교된 LED램프(LED)에 흐르는 전류량에 따라 트랜지스터(Q2)가 리니어하게 능동영역에서 제어되어 LED램프(LED)로 공급되는 전류량이 일정하게 제어되는 것이다.According to the linear type LED driving device configured as described above, the transistor Q2 is linearly controlled in the active area according to the amount of current flowing in the LED lamp (LED) compared by the comparator 3 so that the amount of current supplied to the LED lamp (LED) is constantly controlled. Will be.

그러나, 종래의 스위칭 방식 LED 구동장치와 리니어방식 LED 구동장치는 다음과 같은 문제점이 발생하고 있었다.However, the conventional switching type LED driver and the linear type LED driving device have the following problems.

스위칭 방식 LED 구동장치의 경우 트랜지스터(Q1), 인덕터(L)로 이루어진 구동부의 입력전압이 낮을경우, 예를들면, 시스템 오프시 과도구간이나 순시정전과 같이 구동부로 입력되는 입력전원이 순간적으로 낮아질 경우 이를보상하기 위해 이루어지는 PWM콘트롤러(2)의 보상동작에 의해 트랜지스터(Q1)의 온타임이 길어지게되고, 이에 의해 스위칭소자인 트랜지스터(Q1)에 매우 큰 스트레스가 인가되면서 과도할 경우 트랜지스터가 파손되는 문제점이 발생하고 있었다.In case of a switching type LED driving device, when the input voltage of the driving unit consisting of the transistor (Q1) and the inductor (L) is low, for example, when the input power input to the driving unit is momentarily lowered, such as a transient period or an instantaneous power failure during system off. The on-time of the transistor Q1 is lengthened by the compensation operation of the PWM controller 2 which is made to compensate for this, and when the stress is excessively applied to the transistor Q1 which is a switching element, the transistor is broken. There was a problem.

이러한 문제점을 해결하기 위해서는 큰 정격의 스위칭 소자(트랜지스터)를 사용하여야만 하는데 이럴경우 비용이 과도하게 상승하여 제품의 생산단가가 높아지게되는 문제점이 발생하였다.In order to solve this problem, a large rated switching element (transistor) must be used. In this case, the cost is excessively increased, resulting in a high production cost of the product.

또한, 리니어방식 구동장치의 경우 LED의 온도상승이나 전류량이 변화할 경우 LED의 순방향 전압이 감소하게되어 구동부를 이루는 트랜지스터(Q2)의 출력전압이 낮아지게되고, 이러한 출력전압 하강에 의해 구동부의 입출력 전압차이 만큼 트랜지스터(Q2)에 손실이 급격히 상승하여 트랜지스터가 과도하게 발열하는 문제점이 발생하고 있었다.In addition, in the case of the linear driving device, when the temperature rise or the current amount of the LED changes, the forward voltage of the LED decreases, so that the output voltage of the transistor Q2 constituting the driving unit is lowered. The loss in the transistor Q2 increases sharply by the voltage difference, causing the transistor to generate excessive heat.

따라서, 상기 문제점을 해결하기 위한 발명은 LED램프로 구동전압을 공급하는 구동부의 입력측과 출력측 전압을 감지하여 그 입출력측 전압 차이에 따라 구동부를 구성하는 트랜지스터를 스위칭(Switching)방식 또는 리니어(Linear)방식으로 제어하여 스위칭소자인 트랜지스터에 가해지는 스트레스를 줄여주면서 발열량을 줄여주어 트랜지스터의 파손을 방지하고, 큰 정격의 스위칭소자를 사용하지 않아도 되므로 제품의 생산단가를 현저히 낮춰줄 수 있으며, 고효율 저스트레스의 LED 구동을 구현할 수 있도록 한 듀얼모드 엘이디 구동장치를 제공함을 목적으로 한다.Accordingly, the present invention for solving the above problems is to detect the input and output side voltage of the driving unit for supplying the driving voltage to the LED lamp and switch the transistors constituting the driving unit according to the voltage difference between the input and output (Switching) method or linear (Linear) This method reduces the amount of heat generated while reducing the stress on the transistor, which is a switching element, to prevent breakage of the transistor, and significantly reduces the production cost of the product because it does not require a large rated switching element. It is an object of the present invention to provide a dual-mode LED driving device capable of implementing LED driving.

상기 목적달성을 위한 본 발명은 The present invention for achieving the above object

다수의 LED로 이루어진 LED램프를 구동시키기 위하여 입력전압(Vin)을 선택적으로 통과시키는 트랜지스터와, 상기 트랜지스터의 온동작시 에너지를 충전하고 트랜지스터가 오프될때 축적된 에너지를 프리휠링 다이오드의 프리휠링 동작에 따라 LED램프로 공급하는 인덕터로 구성된 구동부를 포함하는 듀얼모드 LED 구동장치에 있어서,Transistor for selectively passing the input voltage (Vin) to drive the LED lamp consisting of a plurality of LEDs, and the energy stored when the transistor is turned on and the accumulated energy when the transistor is turned off to the freewheeling operation of the freewheeling diode In the dual mode LED driving device including a driving unit consisting of an inductor to supply to the LED lamp according to,

상기 구동부의 입력측(Vin)과 출력측(Vout) 전압을 감지하여 그 입출력측 전압 차이에 따라 구동부를 구성하는 트랜지스터를 스위칭방식 또는 리니어방식으로 제어하는 듀얼모드 제어수단을 더 포함하는 것을 특징으로 한다.And a dual mode control means for sensing the input side Vin and the output side Vout voltage of the driving unit and controlling a transistor constituting the driving unit in a switching method or a linear method according to the difference between the input and output side voltages.

본 발명에 의하면, LED램프로 구동전원을 공급하는 구동부의 입력측전압(Vin)과 출력측전압(Vout)의 전압차가 미리 설정된 설정전압 보다 작을때에는 구동부의 트랜지스터가 리니어방식으로 제어되도록 하여 입력전원이 낮아지면서 듀티비(Duty Ratio)가 증가하여 트랜지스터의 온타임이 증가되어 트랜지스터에 과도한 스트레스가 인가되면서 트랜지스터가 파손되는 현상을 방지할 수 있으며, 또한 입력측전압(Vin)과 출력측전압(Vout)의 전압차가 미리 설정된 설정전압 보다 클 때에는 구동부의 트랜지스터가 스위칭방식으로 제어되도록 하여 입출력측 전압차에 의한 트랜지스터의 손실이 작아져 과도한 발열현상이 발생하지 않도록 하여 전체적으로 LED 구동장치의 동작에 대한 신뢰도를 한층 더 향상시킬 수 있도록 하는 효과를 기대할 수 있다.According to the present invention, when the voltage difference between the input side voltage Vin and the output side voltage Vout of the driving unit which supplies the driving power to the LED lamp is smaller than the preset voltage, the transistor of the driving unit is controlled in a linear manner so that the input power is low. As the duty ratio increases, the on-time of the transistor increases, and excessive stress is applied to the transistor to prevent the transistor from being damaged. In addition, the voltage difference between the input side voltage Vin and the output side voltage Vout is increased. When the voltage is greater than the preset voltage, the transistor of the driver is controlled by the switching method, so that the loss of the transistor due to the voltage difference between the input and output is reduced so that excessive heat generation does not occur, thereby further improving the reliability of the operation of the LED driving device as a whole. You can expect the effect of making it work.

이하, 첨부된 도면 도 3 을 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

본 발명을 설명함에 있어서 정의되는 용어들은 본 발명에서의 기능을 고려하여 정의 내려진 것으로, 본 발명의 기술적 구성요소를 한정하는 의미로 이해되어서는 아니 될 것이다.The terms defined in describing the present invention have been defined in consideration of the functions of the present invention and should not be construed to limit the technical elements of the present invention.

도 3 에 의하면, 본 발명은 According to Figure 3, the present invention

다수의 LED로 이루어진 LED램프(LED10)를 구동시키기 위하여 입력전압(Vin)을 선택적으로 통과시키는 트랜지스터(Q10)와, 상기 트랜지스터(Q10)의 온동작시 에너지를 충전하고 트랜지스터(Q10)가 오프될때 축적된 에너지를 프리휠링 다이오드(DF)의 프리휠링 동작에 따라 LED램프(LED10)로 공급하는 인덕터(L10)로 구성된 구동부를 포함하는 듀얼모드 LED 구동장치에 있어서,Transistor Q10 for selectively passing the input voltage Vin to drive the LED lamp LED10 composed of a plurality of LEDs, and when the transistor Q10 is charged and the energy is turned on when the transistor Q10 is turned off. In the dual mode LED driving device comprising a drive unit consisting of an inductor (L10) for supplying the stored energy to the LED lamp (LED10) in accordance with the freewheeling operation of the freewheeling diode (DF),

상기 구동부의 입력측(Vin)과 출력측(Vout) 전압을 감지하여 그 입출력측 전압 차이에 따라 구동부를 구성하는 트랜지스터(Q10)를 스위칭(Switching)방식 또는 리니어(Linear)방식으로 제어하는 듀얼모드 제어수단(10)을 더 포함하는 것을 특징으로 한다.Dual mode control means for sensing the input (Vin) and output (Vout) voltage of the drive unit and controls the transistor (Q10) constituting the drive unit in a switching method or a linear method according to the voltage difference between the input and output side (Vin) It further comprises (10).

또한, 상기 듀얼모드 제어수단(10)은 In addition, the dual mode control means 10

트랜지스터(Q10)를 스위칭방식으로 제어하기 위해 펄스폭변조된 PWM제어신호를 생성하여 출력하는 PWM콘트롤러(13)와;A PWM controller 13 for generating and outputting a pulse width modulated PWM control signal to control the transistor Q10 in a switching manner;

트랜지스터(Q10)를 리니어방식으로 제어하기 위해 LED램프(LED10)에 흐르는 전류량에 따라 트랜지스터(Q10)를 능동영역에서 동작시켜 LED램프(LED10)에 정전류가 공급되도록 하는 피드백콘트롤러(14)와;A feedback controller 14 for operating a transistor Q10 in an active region according to the amount of current flowing in the LED lamp LED10 to control the transistor Q10 in a linear manner such that a constant current is supplied to the LED lamp LED10;

상기 PWM콘트롤러(13) 또는 피드백콘트롤러(14)의 출력신호를 선택적으로 트랜지스터(Q10)에 공급하는 스위칭부(12)와;A switching unit 12 for selectively supplying an output signal of the PWM controller 13 or the feedback controller 14 to the transistor Q10;

상기 구동부의 입력전압(Vin)과 출력전압(Vout)의 전압차에 따라 상기 스위칭부(12)를 PWM콘트롤러(13) 또는 피드백콘트롤러(14) 측으로 스위칭시키는 전압비교부(11); 로 구성한다.A voltage comparing unit 11 for switching the switching unit 12 to the PWM controller 13 or the feedback controller 14 according to the voltage difference between the input voltage Vin and the output voltage Vout of the driving unit; It consists of.

이때, 상기 전압비교부(11)는 구동부의 입력전압(Vin)과 출력전압(Vout)의 전압차가 미리 설정되어 있는 설정전압 보다 작을 경우 스위칭부(12)를 피드백콘트롤러(14) 측으로 절환시켜 구동부의 트랜지스터(Q10)가 리니어방식으로 제어되도록 하고,At this time, the voltage comparing unit 11 switches the switching unit 12 to the feedback controller 14 when the voltage difference between the input voltage Vin and the output voltage Vout of the driving unit is smaller than a preset voltage. The transistor Q10 is controlled in a linear manner,

전압차가 미리 설정되어 있는 설정전압 보다 높을 경우 스위칭부(12)를 PWM콘트롤러(13) 측으로 절환시켜 구동부의 트랜지스터(Q10)가 스위칭방식으로 제어되도록 동작하는 것을 특징으로 한다.When the voltage difference is higher than a predetermined set voltage, the switching unit 12 may be switched to the PWM controller 13 to operate the transistor Q10 of the driving unit to be controlled by the switching method.

이와같이 구성된 본 발명의 동작을 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above is as follows.

본 발명에 적용된 듀얼모드 제어수단(10)의 스위칭부(12)는 초기 동작시 PWM콘트롤러(13) 측으로 절환되어 있어서 구동부를 이루는 트랜지스터(Q10)는 초기 동작시 스위칭방식으로 제어된다.The switching unit 12 of the dual mode control means 10 applied to the present invention is switched to the PWM controller 13 side during the initial operation, so that the transistor Q10 constituting the driving unit is controlled by the switching method during the initial operation.

따라서, 초기동작시 PWM콘트롤러(13)에서 출력되는 PWM제어신호에 따른 트랜지스터(Q10)의 온/오프 스위칭 동작에 의해 인덕터(L10)에 축적된 에너지가 프리휠링 다이오드(DF)의 프리휠링 동작으로 LED램프(LED10)로 공급되어 LED램프(LED10)가 점등된다.Therefore, the energy accumulated in the inductor L10 by the on / off switching operation of the transistor Q10 according to the PWM control signal output from the PWM controller 13 during the initial operation is a freewheeling operation of the freewheeling diode DF. The LED lamp LED10 is turned on by being supplied to the LED lamp LED10.

이때, 듀얼모드 제어수단(10)의 전압비교부(11)는 구동부로 입력되는 입력전압(Vin)과 구동부에서 출력되는 출력전압(Vout)을 감지하여 그 전압차가 발생하면, 발생된 전압차가 미리설정된 설정전압 보다 큰지 아니면 작은지를 판단한다.At this time, the voltage comparator 11 of the dual mode control means 10 detects an input voltage Vin input to the driver and an output voltage Vout output from the driver, and when the voltage difference occurs, the generated voltage difference is preset. Determine if it is bigger or smaller than the set voltage.

상기 설정전압은 시스템 오프시 과도구간이나 순시정전과 같이 입력전원이 순간적으로 낮아지는 현상 및 LED의 온도상승이나 전류량 변화에 의해 구동부의 출 력전압이 낮아지는 것을 반영할 수 있는 정도, 예를들면 3~4 로 설정한다.The set voltage is a degree that can reflect the phenomenon that the input power is momentarily lowered, such as an over-time or instantaneous power failure when the system off, and the output voltage of the driving unit is lowered due to the temperature rise or change in the amount of current of the LED, for example, 3 ~ Set to 4

따라서, 상기 전압비교부(11)에서 감지된 전압차가 설정전압 보다 작은 경우, 예를들어, 입력전압(Vin)이 출력전압(Vout) 보다 2V 정도 높은 경우에는 큰 듀티비(Duty ratio)에 의해 트랜지스터(Q10)에 가해지는 스트레스를 해소할 수 있도록 하기위해 전압비교부(11)는 스위칭부(12)를 피드백콘트롤러(14) 측으로 강제 절환시키고, 이에따라 트랜지스터(Q10)가 피드백콘트롤러(14)의 제어에 따라 능동영역에서 리니어하게 동작하게 되어 과도한 온타임 튜티에 의해 트랜지스터(Q10)에 제공되는 스트레스를 방지할 수 있게된다.Therefore, when the voltage difference sensed by the voltage comparing unit 11 is smaller than the set voltage, for example, when the input voltage Vin is about 2V higher than the output voltage Vout, the transistor is caused by a large duty ratio. In order to relieve the stress applied to the Q10, the voltage comparator 11 forcibly switches the switching unit 12 to the feedback controller 14, and accordingly, the transistor Q10 causes the control of the feedback controller 14 to be controlled. Accordingly, the linear operation in the active region prevents stress applied to the transistor Q10 due to excessive on-time tutors.

한편, 상기 전압비교부(11)에서 감지된 전압차가 설정전압 보다 큰 경우, 예를들어 입력전압(Vin)이 출력전압(Vout) 보다 5V 이상 높은 경우에는 리니어방식에 의한 트랜지스터(Q10)의 손실 증가에 기인하여 발생하는 발열을 방지할 수 있도록 하기위해 전압비교부(11)는 스위칭부(12)를 PWM콘트롤러(13) 측으로 절환시켜 PWM콘트롤러(13)에서 출력되는 PWM제어신호에 의해 트랜지스터(Q10)가 온오프 스위칭되도록 하는 것이다.On the other hand, when the voltage difference sensed by the voltage comparing unit 11 is greater than the set voltage, for example, when the input voltage Vin is 5 V or more higher than the output voltage Vout, the loss of the transistor Q10 by the linear method increases. In order to prevent heat generated due to the voltage comparing unit 11 switches the switching unit 12 to the PWM controller 13 side by the PWM control signal output from the PWM controller 13 transistor Q10 Is switched on and off.

이상에서 설명한 바와같이 본 발명은 구동부를 이루는 트랜지스터(Q10)와 인덕터(L10)의 입출력전압 차이에 따라서 트랜지스터(Q10)를 스위칭방식 또는 리니어방식으로 적절하게 제어하여 고효율/저스트레스 상태로 LED램프(LED10)를 구동시킬 수 있게되는 효과를 기대할 수 있다.As described above, according to the present invention, according to the difference between the input and output voltages of the transistor Q10 and the inductor L10 which constitute the driving unit, the LED Q ( The effect of being able to drive LED10) can be expected.

도 1 은 종래 스위칭 방식 LED 구동장치를 보인 회로도.1 is a circuit diagram showing a conventional switching type LED driving device.

도 2 는 종래 리니어 방식 LED 구동장치를 보인 회로도.Figure 2 is a circuit diagram showing a conventional linear LED driver.

도 3 은 본 발명의 듀얼모드 LED 구동장치를 보인 회로도.Figure 3 is a circuit diagram showing a dual mode LED drive device of the present invention.

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

10: 듀얼모드 제어수단, 11: 전압비교부,10: dual mode control means, 11: voltage comparison unit,

12: 스위칭부, 13: PWM콘트롤러,12: switching unit, 13: PWM controller,

14: 피드백콘트롤러, Q10: 트랜지스터,14: feedback controller, Q10: transistor,

LED10: LED램프,LED10: LED lamp,

Claims (3)

다수의 LED로 이루어진 LED램프(LED10)를 구동시키기 위하여 입력전압(Vin)을 선택적으로 통과시키는 트랜지스터(Q10)와, 상기 트랜지스터(Q10)의 온동작시 에너지를 충전하고 트랜지스터(Q10)가 오프될때 축적된 에너지를 프리휠링 다이오드(DF)의 프리휠링 동작에 따라 LED램프(LED10)로 공급하는 인덕터(L10)로 구성된 구동부를 포함하는 듀얼모드 LED 구동장치에 있어서,Transistor Q10 for selectively passing the input voltage Vin to drive the LED lamp LED10 composed of a plurality of LEDs, and when the transistor Q10 is charged and the energy is turned on when the transistor Q10 is turned off. In the dual mode LED driving device comprising a drive unit consisting of an inductor (L10) for supplying the stored energy to the LED lamp (LED10) in accordance with the freewheeling operation of the freewheeling diode (DF), 상기 구동부의 입력측(Vin)과 출력측(Vout) 전압을 감지하여 그 입출력측 전압 차이에 따라 구동부를 구성하는 트랜지스터(Q10)를 스위칭(Switching)방식 또는 리니어(Linear)방식으로 제어하는 듀얼모드 제어수단(10)을 더 포함하는 것을 특징으로 하는 듀얼모드 LED 구동장치.Dual mode control means for sensing the input (Vin) and output (Vout) voltage of the drive unit and controls the transistor (Q10) constituting the drive unit in a switching method or a linear method according to the voltage difference between the input and output side (Vin) Dual mode LED driving device, characterized in that it further comprises (10). 제 1 항에 있어서, 상기 듀얼모드 제어수단(10)은 The method of claim 1, wherein the dual mode control means 10 트랜지스터(Q10)를 스위칭방식으로 제어하기 위해 펄스폭변조된 PWM제어신호를 생성하여 출력하는 PWM콘트롤러(13)와;A PWM controller 13 for generating and outputting a pulse width modulated PWM control signal to control the transistor Q10 in a switching manner; 트랜지스터(Q10)를 리니어방식으로 제어하기 위해 LED램프(LED10)에 흐르는 전류량에 따라 트랜지스터(Q10)를 능동영역에서 동작시켜 LED램프(LED10)에 정전류가 공급되도록 하는 피드백콘트롤러(14)와;A feedback controller 14 for operating a transistor Q10 in an active region according to the amount of current flowing in the LED lamp LED10 to control the transistor Q10 in a linear manner such that a constant current is supplied to the LED lamp LED10; 상기 PWM콘트롤러(13) 또는 피드백콘트롤러(14)의 출력신호를 선택적으로 트 랜지스터(Q10)에 공급하는 스위칭부(12)와;A switching unit 12 for selectively supplying an output signal of the PWM controller 13 or the feedback controller 14 to the transistor Q10; 상기 구동부의 입력전압(Vin)과 출력전압(Vout)의 전압차에 따라 상기 스위칭부(12)를 PWM콘트롤러(13) 또는 피드백콘트롤러(14) 측으로 스위칭시키는 전압비교부(11); 로 구성한 것을 특징으로 하는 듀얼모드 LED 구동장치.A voltage comparing unit 11 for switching the switching unit 12 to the PWM controller 13 or the feedback controller 14 according to the voltage difference between the input voltage Vin and the output voltage Vout of the driving unit; Dual mode LED driving device, characterized in that consisting of. 제 2 항에 있어서, 상기 전압비교부(11)는 구동부의 입력전압(Vin)과 출력전압(Vout)의 전압차가 미리 설정되어 있는 설정전압 보다 작을 경우 스위칭부(12)를 피드백콘트롤러(14) 측으로 절환시켜 구동부의 트랜지스터(Q10)가 리니어방식으로 제어되도록 하고,The voltage comparing unit 11 of claim 2, wherein the voltage comparing unit 11 moves the switching unit 12 to the feedback controller 14 when the voltage difference between the input voltage Vin and the output voltage Vout of the driving unit is smaller than a preset set voltage. Switching so that the transistor Q10 of the driving unit is controlled in a linear manner, 전압차가 미리 설정되어 있는 설정전압 보다 높을 경우 스위칭부(12)를 PWM콘트롤러(13) 측으로 절환시켜 구동부의 트랜지스터(Q10)가 스위칭방식으로 제어되도록 동작하는 것을 특징으로 하는 듀얼모드 LED 구동장치.When the voltage difference is higher than a predetermined set voltage, the dual-mode LED driving device, characterized in that the switching unit 12 is switched to the PWM controller 13 side so that the transistor (Q10) of the driving unit is controlled by a switching method.
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