KR20160106962A - power supply circuit for LEDs - Google Patents

power supply circuit for LEDs Download PDF

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Publication number
KR20160106962A
KR20160106962A KR1020150029759A KR20150029759A KR20160106962A KR 20160106962 A KR20160106962 A KR 20160106962A KR 1020150029759 A KR1020150029759 A KR 1020150029759A KR 20150029759 A KR20150029759 A KR 20150029759A KR 20160106962 A KR20160106962 A KR 20160106962A
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South Korea
Prior art keywords
led
current
power supply
sense resistor
unit
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KR1020150029759A
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Korean (ko)
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황재원
백성현
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(주) 파워에이앤디
황재원
백성현
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Priority to KR1020150029759A priority Critical patent/KR20160106962A/en
Priority to PCT/KR2016/002019 priority patent/WO2016140487A1/en
Publication of KR20160106962A publication Critical patent/KR20160106962A/en

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    • H05B33/0815—
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/719—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
    • H05B33/0881—
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • F21Y2101/02—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

Disclosed is a technology configuration to increase durability by preventing damages on LEDs by compensating a decrease in resistance in an LED unit while normally supplying power to an LED power supply circuit without an SMPS and a converter.

Description

LED 전원공급회로{power supply circuit for LEDs}LED power supply circuit

본 발명은 LED에 정전류를 공급하기 위한 LED 전원공급회로에 관한 것으로, 보다 상세하게는 LED의 구동시에는 초기 저항보다 낮은 저항을 갖게 되므로 이를 보상하는 보상저항을 설치함으로써 균일한 전류가 LED에 흐르도록 하는 LED 전원공급회로에 관한 것이다.The present invention relates to an LED power supply circuit for supplying a constant current to an LED. More specifically, since the LED has a resistance lower than an initial resistance during the driving of the LED, To an LED power supply circuit.

조명용 LED로 구성된 부하에 일정한 전류를 공급하기 위한 것으로서, 별도의 SMPS와 같은 전원장치나 펄스폭 변조 전원공급장치와 같은 복잡한 방법을 사용하지 않고 교류 AC전원으로부터 부하로 일정한 전류를 공급하면서 부하에 흐르는 전류를 원하는 대로 제한하는 방법을 제공하기 위하여 특허 제10-1003073호(발명의 명칭: 조명용 ＬＥＤ의 정전류 제어장치)(이하, ‘종래기술’이라 함)가 본 출원인에 의하여 등록되었다.It supplies a constant current to a load consisting of LED for illumination. It supplies constant current from AC AC power source to load without using complicated method such as separate SMPS or pulse width modulation power supply. Patent No. 10-1003073 entitled " Constant Current Control Device for LED for Lighting ") (hereafter referred to as " Prior Art ") was registered by the present applicant in order to provide a method for limiting the current to a desired level.

도 1은 종래기술을 설명하기 위한 회로도이다. 1 is a circuit diagram for explaining a conventional technique.

도 1에 도시된 종래기술에서는 노드21, 22를 통하여 60Hz, 220V가 입력되면 고주파필터(100)에 의하여 제한된 전류가 브릿지부(200)에 입력된다. 이때 브릿지부(200)에 입력되는 전류량은 고주파필터(100)에서 차단주파수를 형성하는 콘덴서C1의 값에 의하여 결정되고, C1의 값이 커지게 되면 차단주파수 값이 작아지게 되어 흐르는 전류량이 작아지게 되고, C1 값이 작아지게 되면 차단주파수 값이 커지게 되어 흐르는 전류량이 커지게 된다. 브릿지부(200)의 출력단의 전압은 맥류형태이고, 평활용 콘덴서C3에 의하여 평활된후 레귤레이터부(300)에 입력되어 일정 전압과 전류를 유지하게 되어 출력단(23), (24)에 연결된 LED 부하에 공급되게 된다. 1, 60 Hz and 220 V are input through the nodes 21 and 22, a limited current is input to the bridge unit 200 by the high-frequency filter 100. At this time, the amount of current input to the bridge unit 200 is determined by the value of the capacitor C1 forming the cut-off frequency in the high-frequency filter 100. When the value of C1 is increased, the cut-off frequency value becomes smaller, When the C1 value becomes smaller, the cut-off frequency value becomes larger and the amount of current flowing becomes larger. The voltage at the output terminal of the bridge unit 200 is in the form of a pulsating current and is smoothed by the smoothing capacitor C3 and then input to the regulator unit 300 to maintain a constant voltage and current, And is supplied to the load.

그러나, 이와 같이 구성된 정전류회로에서는 고주파필터(100)를 형성하기 위하여 주 전류(main current)가 흐르게 되는 노드21의 라인에 직렬로 콘덴서C1은 특성상 마일러 콘덴서로 설치되어야 하지만 마일러 콘덴서의 수명이 길지 않고, 노이즈에 약하고, 높은 전력을 감당할 수 없는 문제점이 있어 부하가 LED인 경우, LED의 수명보다 현격하게 사용수명이 짧기 때문에 전원공급회로를 LED 사용 중에 빈번히 교체하여야 하는 문제점이 존재한다. However, in the constant-current circuit constructed as described above, in order to form the high-frequency filter 100, the capacitor C1 should be installed in series with the line of the node 21 through which the main current flows, There is a problem that the power supply circuit is frequently replaced during the use of the LED because the life is short rather than the lifetime of the LED when the load is an LED because there is a problem that it is not long,

특히, 콘덴서는 주 사용용도가 주 전원라인에 병렬로 설치하여 리플제거용으로 많이 사용되는 것으로, 주 전원라인에 직렬로 연결하여 로드저항처럼 전압과 전류를 다운시키는 목적으로 사용하게 되면, 소비되는 전력이 발생하게 되어 발열이 많이 발생하게 되어 회로에 고장을 야기하게 되고, 전력효율을 강하시킨다.  Particularly, the capacitor is mainly used for the purpose of removing the ripple by being installed in parallel with the main power supply line. When the capacitor is connected to the main power supply line in series to reduce voltage and current like load resistance, Electric power is generated, and a lot of heat is generated, causing a circuit failure and lowering the power efficiency.

또한 콘덴서를 주 전원라인에 직렬로 연결하는 경우에 발열문제로 전류 공급용량에 한계가 있어 15Watt 미만의 회로에서 주로 사용하게 되고, 이를 초과하는 대용량의 부하에는 사용할 수 없는 문제가 있다. Also, when the capacitor is connected in series to the main power supply line, there is a limitation in the current supply capacity due to the heat generation problem, which is mainly used in a circuit of less than 15 Watt, and can not be used for a large capacity load exceeding this.

도 2는 또 다른 종래기술의 회로도이다.2 is another circuit diagram of the prior art.

도 1에서 발생되는 문제점을 해결하기 위하여 부하가 LED인 경우에 AC교류를 브릿지회로(BD)를 사용하여 정류한 후 콘덴서(c)로 평활시켜 LED부하에 공급한다. 이때 LED부하의 부하저항(RL)은 평활전압 V = (IL* RL)(IL은 설계시에 결정되는 부하전류)에 의하여 결정되며, 부하저항(RL)은 각각의 LED의 도통시에 저항을 RΙ이라하고, LED 개수를 n이라 하면 평활전압 V = (IL* nRl)가 만족하도록 n, 즉 LED 개수를 결정하여 설치하게 된다.In order to solve the problem occurring in FIG. 1, when the load is an LED, an AC alternating current is rectified by using a bridge circuit BD, then smoothed by a capacitor c and supplied to an LED load. At this time, the load resistance R L of the LED load is determined by the smoothed voltage V = (I L * R L ) (I L is the load current determined at the design time), and the load resistance R L as conduction resistance R Ι upon, and when n as the number of LED is installed to determine n, i.e. the number of LED to meet the smoothed voltage V = (I L * nR l ).

그러나, 이와 같이 회로를 구성하여 LED에 전원을 공급하면, LED의 도통시에 저항이 가변되게 되면 LED의 광효율이 떨어지고 파손의 염려가 있다. 즉 LED 고유 저항값이 낮아지게 되면 과대전류가 흐르게 되고, 높은 저항값을 갖게 되면 저전류가 흐르게 되어 LED의 발광효율이 떨어지게 된다. LED는 초기 도통시에는 고유 저항값이 상승하지만 일정시간(약 10분)이 경과되어 온도의 상승이 멈추게 되는 포화상태에 이르게 되면 초기 고유저항 보다 낮은 정상 고유저항값을 유지하게 된다.However, if power is supplied to the LEDs by constituting the circuit as described above, if the resistance is varied when the LEDs are turned on, the light efficiency of the LEDs is lowered and there is a risk of breakage. That is, when the resistance value of the LED is lowered, an overcurrent flows, and when the resistance value is high, a low current flows and the efficiency of the LED is lowered. The LED maintains a normal resistivity value lower than the initial resistivity when it reaches a saturation state in which the intrinsic resistance value rises at the time of initial conduction but reaches a saturation state where the temperature rise is stopped after a certain time (about 10 minutes) elapses.

본 발명은 이러한 문제점을 해결하기 위한 것으로, 본 발명은 LED의 점등시키기 위하여 SMPS, 컨버터 등의 복잡한 회로부를 형성하지 않고도 간단한 회로에 의해서 균일한 전류를 LED에 공급할 수 있도록 하는 LED의 전원공급장치를 제공하기 위한 것이다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide an LED power supply device capable of supplying a uniform current to an LED by a simple circuit without forming a complicated circuit part such as an SMPS, .

상기 과제를 해결하기 위한 해결수단은 교류전원을 정류하는 브릿지부;According to an aspect of the present invention, there is provided a power supply device comprising: a bridge unit for rectifying AC power;

상기 브릿지부의 출력전압을 평활하는 평활용 콘덴서; 상기 평활용 콘덴서의 양단자에 직렬로 연결되는 LED부와 상기 LED부에 일정전류가 흐르도록 전류량을 제어하는 전류제어소자를 포함하는 것이 바람직하다.A smoothing capacitor for smoothing an output voltage of the bridge unit; An LED unit connected in series to both terminals of the smoothing capacitor, and a current control device controlling a current amount so that a constant current flows through the LED unit.

또한 본 발명에서 상기 전류제어소자는 흐르는 전류량이 증가할 때 저항이 증가하는 가변저항소자인 것이 바람직하다. In the present invention, it is preferable that the current control element is a variable resistance element whose resistance increases when the amount of current flowing increases.

또한 본 발명의 다른 해결수단은 교류전원을 정류하는 브릿지부; 상기 브릿지부의 출력전압을 평활하는 평활용 콘덴서; 상기 평활용 콘덴서의 양단자 사이에 직렬로 연결되어 설치되는 LED부와 감지저항; 상기 평활용 콘덴서의 양단자 사이에 설치되어 상기 LED부와 감지저항과 병열관계가 되는 스위칭소자를 포함하며, 상기 감지저항이 기설정된 전압 이상인 경우에 도통되어 상기 LED부에 흐르는 전류량을 감소시키는 것이다. According to another aspect of the present invention, there is provided a plasma processing apparatus comprising: a bridge unit for rectifying AC power; A smoothing capacitor for smoothing an output voltage of the bridge unit; An LED portion and a sense resistor connected in series between both terminals of the smoothing capacitor; And a switching element which is provided between both terminals of the smoothing capacitor and is in parallel relation to the LED unit and the sense resistor, and is turned on when the sense resistor is above a predetermined voltage to reduce an amount of current flowing through the LED unit .

또한 본 발명에서 상기 스위칭 소자는 전력제어소자이고, 상기 전력제어소자의 드라이브 입력단은 상기 감지저항과 연결되어 상기 감지저항의 전위가 바이어스 전압 이상일 때 도통되는 것이 바람직하다.Preferably, the switching element is a power control element, and the drive input terminal of the power control element is connected to the sense resistor, and is conducted when the potential of the sense resistor is equal to or higher than a bias voltage.

본 발명의 해결과제와 해결수단에 따르면, 특별한 SMPS, 콘버터 등의 회로 구성없이 LED들의 숫자를 조절하여 입력전압과 매칭시킴으로써 LED들에 전원을 공급할 뿐만 아니라, 전류량의 변화에 의하여 저항값이 가변되거나, 전류량을 병렬라인으로 흐르도록 함으로써 LED들에 일정한 전원이 흐르도록 함으로써 LED들을 보호할 수 있도록 있도록 한다.According to the solution and the solution of the present invention, it is possible to supply power to the LEDs by adjusting the number of LEDs by matching the input voltage with a circuit configuration of a special SMPS, a converter, or the like, , Allowing the amount of current to flow through the parallel lines so that the LEDs can be protected by allowing a constant power source to flow.

도 1은 종래기술을 설명하기 위한 회로도이다.
도 2는 또 다른 종래기술의 회로도이다.
도 3은 본 발명의 제1실시예를 설명하는 회로도이다.
도 4는 도 3의 콘덴서C10의 양단의 단자전압의 그래프이다.
도 5는 본 발명의 제2실시예를 설명하는 회로도이다.1 is a circuit diagram for explaining a conventional technique.
2 is another circuit diagram of the prior art.
3 is a circuit diagram illustrating the first embodiment of the present invention.
4 is a graph of terminal voltages at both ends of the capacitor C10 of Fig.
5 is a circuit diagram illustrating a second embodiment of the present invention.

도 3은 본 발명의 제1실시예를 설명하는 회로도이고, 도 4는 도 3의 콘덴서C10의 양단의 단자전압의 그래프이다.FIG. 3 is a circuit diagram illustrating the first embodiment of the present invention, and FIG. 4 is a graph of terminal voltages at both ends of the capacitor C10 of FIG.

도 3에 도시된 제1실시예는 AC전원을 정류하는 브릿지부(BD)와, 브릿지부(BD)의 맥류를 평활시키도록 브릿지부(BD)의 양단에 설치되는 콘덴서(C10)와, 콘덴서(C10)의 양단자(a), (b)에는 LED부(1)와 전류제어소자가 직렬로 연결된다. 전류제어소자는 LED부(1)에 흐르는 전류에 의하여 저항값이 증가하는 가변저항(Rx)인 것이 바람직하다. The first embodiment shown in Fig. 3 includes a bridge portion BD for rectifying an AC power source, a capacitor C10 provided at both ends of the bridge portion BD to smoothen the pulsation of the bridge portion BD, The LED unit 1 and the current control device are connected in series to both the terminals a and b of the display panel C10. It is preferable that the current control element is a variable resistor Rx whose resistance value is increased by the current flowing in the LED portion 1. [

LED부(1)의 양단자(c), (d)의 초기전압은 a, b 단자 사이의 전압인 Vab와 동일하게 되나, LED부(1)가 도통되어 온도가 상승되어 일정온도로 유지되는 포화상태에 이르게 되면 LED부(1)의 양단자(c), (d) 사이의 전압Vcd는 Vab보다 낮은 Vab' 로 결정되어 가변저항(Rx)에 인가되는 전압 VR은 VR= Vab - Vab'이 성립하게 된다. 이때 Vcd는 도 4에 도시된 바와 같이 초기에는 높다가 점차 감소된 후 일정 전압을 유지하기 때문에 가변저항에 인가되는 전압VR은 초기에 0으로부터 시작되어 점차 증가된 후에 VR = Vab - Vab'의 정상상태 값을 유지하게 된다. 즉, 가변저항Rx는 LED부(1)의 저항값이 감소될 때 이를 보상하는 보상저항 역할을 수행하게 되는 소자로서, 결국 전류량이 증가될 때 저항값이 증가되는 가변저항 소자로 설치된다. The initial voltage of both terminals c and d of the LED unit 1 becomes equal to the voltage Vab between the terminals a and b but the LED unit 1 is turned on to maintain the temperature at a constant temperature The voltage Vcd between the terminals c and d of the LED unit 1 is determined to be Vab 'lower than Vab so that the voltage VR applied to the variable resistor Rx is VR = Vab-Vab' . At this time, as shown in FIG. 4, Vcd is initially high, but gradually decreases and then maintains a constant voltage. Therefore, the voltage VR applied to the variable resistor is initially increased from zero to gradually increase, and then to VR = Vab- State value. That is, the variable resistor Rx serves as a compensation resistor that compensates when the resistance value of the LED unit 1 is reduced. As a result, the variable resistor Rx is provided as a variable resistance element whose resistance value increases when the amount of current increases.

따라서 평활용 콘덴서(C10)의 후단의 저항을 시간에 관계없이 일정한 값을 유지하도록 함으로써 전원라인에 일정전류가 흐르도록 함으로써 LED부(1)를 형성하는 LED들을 보호하게 된다. Therefore, the resistance of the rear end of the smoothing capacitor C10 is maintained at a constant value regardless of the time, so that a constant current flows in the power supply line, thereby protecting the LEDs forming the LED unit 1. [

도 5는 본 발명의 제2실시예를 설명하는 회로도이다. 5 is a circuit diagram illustrating a second embodiment of the present invention.

도 5에 도시된 실시예는 도 3의 회로에서 전류량에 따라 저항값이 증가하는 가변저항(VR)을 전자회로로 구성한 것으로 동일한 부분에 대하여 동일한 부호를 부여하고, 설명을 생략하기로 한다. In the embodiment shown in Fig. 5, the variable resistor VR whose resistance value increases in accordance with the amount of current in the circuit of Fig. 3 is constituted by an electronic circuit, and the same reference numerals are given to the same parts and description thereof is omitted.

콘덴서 양단자(a), (b)에 직렬로 연결된 LED부(1)와 감지저항(R10)이 설치되며, 양단자(a), (b)에는 스위칭수단이 설치되어, 양단자(a), (b)에 대하여 직렬로 연결된 LED부(1)와 감지저항(R10)과 병렬관계를 유지한다. 이때 스위칭수단은 트랜지스터(QR)가 사용되는 것이 제조원가 면에서 바람직하다. 트랜지스터(QR)의 베이스는 감지저항(R10)과 연결됨으로써 감지저항(R10)에 일정전압 이상이 감지될 때 동작하게 된다. The LED unit 1 and the sense resistor R10 are connected in series to both terminals a and b of the condenser and switching means is provided at both terminals a and b, the LED unit 1 and the sensing resistor R10 connected in series with respect to the sensing resistor R10 and the sensing resistor R10. At this time, it is preferable that the transistor QR be used as the switching means in view of the manufacturing cost. The base of the transistor QR is connected to the sense resistor R10, so that the base of the transistor QR operates when a certain voltage or more is sensed in the sense resistor R10.

이와 같이 구성된 도 5의 회로에서는 LED부(1)에 전원이 인가되는 초기에는 LED부(1)의 저항이 높기 때문에 감지저항(R10)에 흐르는 전류가 작게 되어 스위칭소자인 트랜지스터(QR)의 베이스에 인가되는 전압이 바이어스 전압보다 낮게 되어 트랜지스터 (QR)의 콜렉터-에미터로 흐르는 동작전류가 흐르지 않게 된다. 그러나 시간이 경과되어 정상상태에 이르게 되면 LED부(1)의 저항이 낮아지게 되어 감지저항(R10)에 흐르는 전류가 크게 되고, 트랜지스터(QR)의 제어단자베이스에 인가되는 전압이 바이어스전압을 넘게 되면 트랜지스터(QR)는 구동됨으로써 콜렉터-에미터로 전류가 흐르게 된다. 따라서 LED부(1)에 흐르는 전류가 일정한 값을 유지하게 된다. 미설명 부호(R11)는 트랜지스터(QR)에 흐르는 전류를 제한하기 위한 전류제한저항이다. 5, since the resistance of the LED unit 1 is high at the beginning of the application of power to the LED unit 1, the current flowing through the sense resistor R10 is small, and the base of the transistor QR, The voltage applied to the collector-emitter of the transistor QR becomes lower than the bias voltage, so that the operation current flowing to the collector-emitter of the transistor QR does not flow. However, when the time comes to reach a steady state, the resistance of the LED unit 1 is lowered, the current flowing through the sense resistor R10 is increased, and the voltage applied to the control terminal base of the transistor QR exceeds the bias voltage The transistor QR is driven so that current flows to the collector-emitter. Therefore, the current flowing through the LED unit 1 maintains a constant value. Reference character R11 is a current limiting resistor for limiting the current flowing through the transistor QR.

도 5의 실시예에서 LED부(1)의 전류를 일정한 값으로 유지하기 위한 스위칭소자로서 예시적으로 트랜지스터(QR)로 설명하였으나, 이는 FET, IGBT, 및 전력제어소자인 사이리스터 및 트라이악 등 다양한 회로소자들을 채택하여 변형 설계할 수 있다.In the embodiment of FIG. 5, the switching element for maintaining the current of the LED unit 1 at a constant value has been exemplarily described as the transistor QR. However, the switching element QR may be a variety of elements such as a FET, an IGBT, and a thyristor The circuit elements can be adopted for deformation design.

1: LED부 BD: 브릿지부
C10: 평활용 콘덴서 Rx: 가변저항
R10: 감지저항 QR: 트랜지스터1: LED part BD: Bridge part
C10: smoothing capacitor Rx: variable resistor
R10: Sense resistor QR: Transistor

Claims (4)

교류전원을 정류하는 브릿지부;
상기 브릿지부의 출력전압을 평활하는 평활용 콘덴서;
상기 평활용 콘덴서의 양단자에 직렬로 연결되는 LED부와 상기 LED부에 일정전류가 흐르도록 전류량을 제어하는 전류제어소자를 포함하는 것을 특징으로 하는 LED 전원공급회로.A bridge unit for rectifying AC power;
A smoothing capacitor for smoothing an output voltage of the bridge unit;
An LED unit connected in series to both terminals of the smoothing capacitor, and a current control device controlling an amount of current to flow a constant current to the LED unit. 청구항1에 있어서, 상기 전류제어소자는 흐르는 전류량이 증가할 때 저항이 증가하는 가변저항소자인 것을 특징으로 하는 LED 전원공급회로.The LED power supply circuit according to claim 1, wherein the current control element is a variable resistance element whose resistance increases when the amount of current flowing increases. 교류전원을 정류하는 브릿지부;
상기 브릿지부의 출력전압을 평활하는 평활용 콘덴서;
상기 평활용 콘덴서의 양단자 사이에 직렬로 연결되어 설치되는 LED부와 감지저항;
상기 평활용 콘덴서의 양단자 사이에 설치되어 상기 LED부와 감지저항과 병열관계가 되는 스위칭소자를 포함하며,
상기 감지저항이 기설정된 전압 이상인 경우에 도통되어 상기 LED부에 흐르는 전류량을 감소시키는 것을 특징으로 하는 LED 전원공급회로.A bridge unit for rectifying AC power;
A smoothing capacitor for smoothing an output voltage of the bridge unit;
An LED portion and a sense resistor connected in series between both terminals of the smoothing capacitor;
And a switching element provided between both terminals of the smoothing capacitor and in parallel relation with the LED portion and the sense resistor,
Wherein the LED power supply circuit is turned on when the sense resistor is higher than a predetermined voltage to reduce the amount of current flowing to the LED unit. 청구항3에 있어서, 상기 스위칭 회로는 전력제어소자이고, 상기 전력제어소자의 드라이브 입력단은 상기 감지저항과 연결되어 상기 감지저항의 전위가 바이어스 전압 이상일 때 도통되는 것을 특징으로 하는 LED 전원공급회로.4. The LED power supply circuit as claimed in claim 3, wherein the switching circuit is a power control element, and the drive input terminal of the power control element is connected to the sense resistor so as to be conducted when the potential of the sense resistor is equal to or higher than a bias voltage.
KR1020150029759A 2015-03-03 2015-03-03 power supply circuit for LEDs KR20160106962A (en)

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