KR20110005346U - LED Power Supply Device for Power Factor Improvement - Google Patents

LED Power Supply Device for Power Factor Improvement Download PDF

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Publication number
KR20110005346U
KR20110005346U KR2020110004073U KR20110004073U KR20110005346U KR 20110005346 U KR20110005346 U KR 20110005346U KR 2020110004073 U KR2020110004073 U KR 2020110004073U KR 20110004073 U KR20110004073 U KR 20110004073U KR 20110005346 U KR20110005346 U KR 20110005346U
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South Korea
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power factor
circuit
led
power supply
factor improvement
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KR2020110004073U
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Korean (ko)
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KR200465924Y1 (en
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김성실
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아이에스이텍 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

본 고안은 소형이고 저가이며 고역률 달성이 가능한 LED용 역률 개선 회로를 제공한다.
본 고안은, 역률 개선을 위한 엘이디용 전원 공급 장치에 있어서,
입력되는 교류 전압을 정류하는 정류회로(1);
엘이디와 직렬로 연결되는 정전류 회로(3);
상기 직렬로 연결된 정전류 회로(3)와 엘이디가 병렬로 연결되는 콘덴서(C);
상기 정류회로(1)의 출력과 콘덴서(C) 사이에 존재하는 저항(R)을 포함하는 것을 특징으로 한다.
이상과 같은 본 고안의 역률 개선 회로를 이용하면, 소형이면서 저가이며 고역률의 역률 개선 회로를 제공할 수 있다.The present invention provides a power factor improvement circuit for LEDs that is compact, low cost and high power factor can be achieved.
The present invention, in the LED power supply for power factor improvement,
A rectifier circuit 1 for rectifying an input AC voltage;
A constant current circuit 3 connected in series with the LED;
A capacitor (C) in which the constant current circuit (3) connected in series and the LED are connected in parallel;
It characterized in that it comprises a resistor (R) existing between the output of the rectifier circuit (1) and the capacitor (C).
By using the power factor correction circuit of the present invention as described above, it is possible to provide a power factor improvement circuit of small power, low cost and high power factor.

Description

역률 개선을 위한 엘이디용 전원 공급 장치{LED Power Supply Device for Power Factor Improvement} LED Power Supply Device for Power Factor Improvement

본 고안은 LED용 소형 전원 공급 장치에서 역률을 개선하는 회로에 관한 것이다.The present invention relates to a circuit for improving power factor in a small power supply for LEDs.

LED램프는 크기가 작기 때문에, 내부에 소형 전원 공급 장치가 사용되고, 종래의 LED용 전원 공급 장치는, 도1에서와 같은 구성을 가지고 있어서, 교류(AC)가 브리지 다이오드 회로에 공급되어 맥류를 형성하고, LED에 인가하는 전압을 일정하게 하기 위해 다시 전해 콘덴서를 이용하여 직류(DC)에 근접하게 만들어서 LED에 공급되게 된다. Since the LED lamp is small in size, a small power supply is used inside, and the conventional power supply for LED has the configuration as shown in Fig. 1, so that AC is supplied to the bridge diode circuit to form a pulse flow. In order to make the voltage applied to the LED constant, it is made close to the direct current (DC) by using an electrolytic capacitor and supplied to the LED.

그런데, 이러한 종래기술에서는 단순히 전해 콘덴서를 사용하기 때문에, 도3의 두 번째 그래프처럼 입력 전압의 피크치 근처에서 신속히 충전이 시작하고 신속히 방전되므로, 입력 전류가 흐르는 기간이 짧아서 입력 전압의 파형 중에서 일부 기간에만 입력 전류가 흘러서 역률이 저하되어 전력을 공급하는 전송선로에 손실이 발생한다.However, since such a conventional technique simply uses an electrolytic capacitor, as shown in the second graph of FIG. 3, charging starts and discharges quickly near the peak value of the input voltage. Only when the input current flows, the power factor is lowered, resulting in a loss in the power transmission line.

이를 개선하기 위해서는 역률 개선 회로(Power Factor Correction Circuit : PFC)를 가진 전원 공급 장치를 적용해야 하는데, LED램프에서는 회로를 수용할 수 있는 내부 공간 크기가 작고 역률 개선회로 추가에 따른 비용 증가가 발생하므로, 역률 개선 회로를 적용한 전원 공급 장치를 저가이고 소형화하기가 어려워서 많은 경우에 이러한 역률 개선 회로를 적용하지 않아서 에너지 낭비가 초래된다.To improve this, a power supply with a power factor correction circuit (PFC) must be applied.In LED lamps, the internal space that can accommodate the circuit is small and the cost increases due to the addition of the power factor correction circuit. However, power supplies with power factor correction circuits are inexpensive and difficult to miniaturize, resulting in waste of energy by not applying such power factor correction circuits in many cases.

한편, 역률 개선 회로에는 수동(Passive) 방식과 능동(Active) 방식이 있는데, 수동 방식의 대표적인 방법은 도2에서와 같이 전해 콘덴서(C)에 대응하는 인덕터(L)를 사용하는 LC공진회로 방식이고, 이 방식에서는 도3의 세 번째 그래프와 같이 2번째 그래프에 비해 인덕터가 콘덴서의 위상 차이를 보상해 주어 역률이 개선되며(즉, 콘덴서에 의한 진상을 인턱터의 지상으로 보상해 준다), 이 수동방식에서는 보통 0.8정도까지 역률을 개선할 수 있다.Meanwhile, the power factor correction circuit includes a passive method and an active method. An exemplary method of the passive method uses an LC resonant circuit method using an inductor L corresponding to an electrolytic capacitor C as shown in FIG. In this method, as shown in the third graph of FIG. 3, the inductor compensates the phase difference of the capacitor compared to the second graph, thereby improving the power factor (that is, compensating the fact of the capacitor to the ground of the inductor). In manual mode, power factor can be improved to about 0.8.

그러나, 교류 전류가 50Hz 내지 60Hz의 저주파수이므로 저주파 인덕터를 만들기 위해서는 인덕터의 크기가 크고, 이에 따라 무게가 무거워서, 소형 전원 공급 장치에 사용할 수 없다.However, since the alternating current is a low frequency of 50Hz to 60Hz, the size of the inductor is large in order to make a low frequency inductor, and thus the weight is heavy, and thus it cannot be used in a small power supply.

또한, 능동방식은 스위칭 방식을 이용하여 고역률을 구현 가능하지만, 회로가 복잡하여 가격이 비싸고 스위칭에 따른 고조파 발생으로 인하여 EMI 등의 대책을 세워야 하는 문제가 있어서, 내부 공간이 협소하고 저가격 제조가 필요한 소형 전원 공급 장치에서는 이러한 능동 방식의 역률 개선 회로를 사용하기 어렵다.In addition, the active method can implement a high power factor using a switching method, but the circuit is expensive, and there is a problem in that countermeasures such as EMI due to harmonics generated by switching have to be taken. It is difficult to use this active power factor correction circuit in the required small power supply.

본 고안은 상기와 같은 종래의 능동 방식 및 수동 방식의 역률 개선 장치의 문제점을 감안하여, 소형이고 저가이며 고역률 달성이 가능한 LED용 역률 개선 회로를 제공한다.The present invention provides a power factor improvement circuit for LEDs that is compact, inexpensive, and capable of achieving high power factor in view of the problems of the conventional active and passive power factor correction devices as described above.

이와 같은 목적을 달성하기 위하여, 본 고안은, 역률 개선을 위한 엘이디용 전원 공급 장치에 있어서,In order to achieve the above object, the present invention, in the LED power supply for power factor improvement,

입력되는 교류 전압을 정류하는 정류회로(1);A rectifier circuit 1 for rectifying an input AC voltage;

엘이디와 직렬로 연결되는 정전류 회로(3);A constant current circuit 3 connected in series with the LED;

상기 직렬로 연결된 정전류 회로(3)와 엘이디가 병렬로 연결되는 콘덴서(C);A capacitor (C) in which the constant current circuit (3) connected in series and the LED are connected in parallel;

상기 정류회로(1)의 출력과 콘덴서(C) 사이에 존재하는 저항(R)을 포함하는 것을 특징으로 한다.It characterized in that it comprises a resistor (R) existing between the output of the rectifier circuit (1) and the capacitor (C).

이상과 같은 본 고안의 역율 개선 회로를 이용하면, LED램프에 사용하기에 적합한, 소형이면서 저가이며 고역률의 역률 개선 회로를 제공할 수 있다.By using the power factor improvement circuit of the present invention as described above, it is possible to provide a compact, low cost and high power factor power factor improvement circuit suitable for use in an LED lamp.

도1은 종래기술에 따른 전원 공급 장치를 도시함.
도2는 종래기술에서, 전해 콘덴서(C)에 대응하는 인덕터(L)를 사용하는 LC공진회로 방식의 역률개선회로를 도시함.
도3은 종래기술과 본 발명에 따른 입력 전류의 파형을 도시함.
도4는 본 발명에 따른 전원 공급 장치를 도시함.1 shows a power supply according to the prior art.
Fig. 2 shows a power factor improvement circuit of the LC resonant circuit method using the inductor L corresponding to the electrolytic capacitor C in the prior art.
Figure 3 shows the waveform of the input current according to the prior art and the present invention.
4 shows a power supply according to the invention.

이하에서는 도면을 참조하여 본 고안을 보다 구체적으로 설명한다. Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

본 고안은 도4와 같이, 교류 전원이 브리지 다이오드 회로(1)에 의해 맥류 형태로 정류되고, 전류제한용 저항(2)과 정전류 회로(3)를 사용한다.In the present invention, as shown in Fig. 4, the AC power supply is rectified in the form of a pulse current by the bridge diode circuit 1, and a current limiting resistor 2 and a constant current circuit 3 are used.

이렇게 하면, 교류전원(Vin)이 브리지 다이오드 회로(1)에 의해 맥류로 정류되고 콘덴서(C)에 의해 전압 변동이 적게 되고(거의 정전압 상태), 부하 측에는 정전류 회로(3)에 의해 일정한 전류가 흐르게 되어, 부하인 LED에는 콘덴서(C)에 의한 거의 일정한 전압이 걸리고 정전류 회로(3)에 의해 일정한 전류가 흐르게 되어, 부하인 LED에는 정전압과 전전류가 인가되므로 밝기가 일정하게 유지되게 된다.In this case, the AC power supply Vin is rectified into the pulse current by the bridge diode circuit 1, the voltage fluctuation is reduced by the capacitor C (almost constant voltage state), and a constant current is supplied to the load side by the constant current circuit 3. Since the LED which is a load receives a substantially constant voltage by the capacitor C, and a constant current flows by the constant current circuit 3, the constant voltage and full current are applied to the LED which is a load, so that the brightness is kept constant.

그리고, 전류 제한용 저항(2)에 의해 충전 전류가 제한되어 콘덴서(C)에 전하가 서서히 충전되어 충전시간이 늘어나게 되고, 정전류회로(3)에 의해 방전시간을 늘려주게 되어, 도3의 네 번째 도면과 같은 입력 전류 파형이 되어서, 도3의 첫 번째 도면에 나타난 입력 전압 파형의 위상과 도3의 네 번째 도면에 나타난 입력 전류 파형의 위상이 거의 일치하게 되어, 역율이 크게 개선되게 된다.Then, the charging current is limited by the current limiting resistor 2, the charge is gradually charged in the capacitor C, and the charging time is increased, and the discharging time is increased by the constant current circuit 3. The input current waveform as shown in FIG. 3 becomes the same, and the phase of the input voltage waveform shown in the first drawing of FIG. 3 and the phase of the input current waveform shown in the fourth drawing of FIG. 3 almost coincide, thereby greatly improving the power factor.

또한, 정전류회로(3)는 원칩으로 제작되므로 가격이 저렴하고 부피가 작아서, LED램프와 같은 소형이고 저가의 전원장치에 적용되어 전체적으로 고역률이 달성되므로, 에너지 절감 효과가 크게 된다.
In addition, since the constant current circuit 3 is made of one chip, it is inexpensive and small in volume, and is applied to a small and low-cost power supply such as an LED lamp to achieve a high power factor as a whole, thereby increasing energy saving effect.

이상에서는 본 고안의 바람직한 실시예를 설명하였으나, 본 고안은 상기의 실시예에 한정되는 것이 아니라, 본 고안의 정신을 벗어나지 않는 범위 내에서 다양한 변형이 가능하다는 점에 유의해야 한다.In the above described a preferred embodiment of the present invention, the present invention is not limited to the above embodiment, it should be noted that various modifications are possible within the scope without departing from the spirit of the present invention.

Claims (2)

역률 개선을 위한 엘이디용 전원 공급 장치에 있어서,
입력되는 교류 전압을 정류하는 정류회로(1);
엘이디와 직렬로 연결되는 정전류 회로(3);
상기 직렬로 연결된 정전류 회로(3)와 엘이디가 병렬로 연결되는 콘덴서(C);
상기 정류회로(1)의 출력과 콘덴서(C) 사이에 존재하는 저항(R)을 포함하는 것을 특징으로 하는 역률 개선을 위한 엘이디용 전원 공급 장치.In the power supply for LED for improving the power factor,
A rectifier circuit 1 for rectifying an input AC voltage;
A constant current circuit 3 connected in series with the LED;
A capacitor (C) in which the constant current circuit (3) connected in series and the LED are connected in parallel;
Power supply for LEDs for improving the power factor, characterized in that it comprises a resistor (R) existing between the output of the rectifier circuit (1) and the capacitor (C). 제1항에 있어서.
상기 정류회로(1)는 브리지 다이오드 회로인 것을 특징으로 하는 역률 개선을 위한 엘이디용 전원 공급 장치.
The method of claim 1.
The rectifier circuit (1) is a power supply device for the LED for power factor improvement, characterized in that the bridge diode circuit.
KR2020110004073U 2011-05-13 2011-05-13 LED Power Supply Device for Power Factor Improvement KR200465924Y1 (en)

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KR20100023233A (en) * 2008-08-21 2010-03-04 (주)네스라이트 Ac/dc combination operating systems for working led module
KR100996581B1 (en) * 2010-04-22 2010-11-25 엔엘티테크주식회사 Power Supply Device Having Current Control Circuit for Power Factor Improvement

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