WO2015050349A1 - Alternating current led driving circuit capable of supplying stable power - Google Patents

Alternating current led driving circuit capable of supplying stable power Download PDF

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Publication number
WO2015050349A1
WO2015050349A1 PCT/KR2014/009148 KR2014009148W WO2015050349A1 WO 2015050349 A1 WO2015050349 A1 WO 2015050349A1 KR 2014009148 W KR2014009148 W KR 2014009148W WO 2015050349 A1 WO2015050349 A1 WO 2015050349A1
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Prior art keywords
led
power
unit
power supply
dimmer
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PCT/KR2014/009148
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French (fr)
Korean (ko)
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권옥환
신소봉
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메를로랩 주식회사
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Publication of WO2015050349A1 publication Critical patent/WO2015050349A1/en

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    • 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
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Definitions

  • the present invention relates to an alternating current LED driving circuit, and in particular, the circuit configuration for driving the dimmer and the circuit configuration for generating the internal power source share a key element, and the dimmer driving and the internal power generation through the integrated circuit having a relatively small size.
  • the present invention relates to an alternating current LED driving circuit capable of supplying a stable power supply to enable the implementation of an electronic circuit.
  • AC LED driving circuit proposed to drive LED under AC power has advantages of simple manufacturing process, low defect rate and long life compared with Switched mode power supply (SMPS) method.
  • SMPS Switched mode power supply
  • FIG. 1 is a view showing a conventional general AC LED driving circuit, the AC LED driving circuit is a basic principle that sequentially controls the current source (10).
  • the current source 20 for hold current in FIG. 2 should basically have a similar level of performance and function as a circuit driving the LED channel, the current source 10 constituting the LED channel.
  • the current source 10 constituting the LED channel.
  • ILEDn1 to ILEDn it is common to use ultra-high-voltage transistor of several hundred volts (V) class.
  • the power supply unit of the AC LED driving circuit may be designed in various ways according to the performance level required by the corresponding AC LED driving circuit.
  • the analog precision voltage circuit is usually designed using a low voltage transistor, whereas the power supply of the AC LED driving circuit is a power supply of 90 to 270 Vac.
  • the present invention has been proposed to solve the above problems, and the circuit configuration for driving the dimmer and the circuit configuration for generating the internal power supply share a key element, and the dimmer driving and It is an object of the present invention to provide an AC LED driving circuit capable of supplying a stable power that enables the implementation of an internal power generation circuit.
  • the AC LED driving circuit capable of supplying stable power includes a power supply unit to which external power is supplied and a first LED unit located at a shortest distance from a connection point with the power supply unit.
  • An LED lighting unit including an n-th LED unit located at the longest distance from the power supply unit, and individually connected to the output terminal of one or more LEDs forming the first to n-th LED unit to supply current to the corresponding LED or LED unit And a plurality of LED switching circuits forming a channel, and an internal power generation unit connected in parallel on a connection line between the power supply unit and the LED lighting unit to generate internal power for the operation of the LED lighting unit.
  • the power supply unit may further include a dimmer
  • the internal power generation unit includes a power transistor having an input terminal connected in parallel to a connection line between the power supply unit and the LED lighting unit, and a hold current for driving the dimmer connected to an output terminal of the power transistor.
  • a hold current source for on / off, a diode connected in parallel with the hold current source at an output terminal of the power transistor, a capacitor connected with an output terminal of the diode, and a parallel connection with the capacitor at an output terminal of the diode
  • a voltage regulator for example, a voltage regulator, and the internal power generation unit includes a power transistor having an input terminal connected in parallel to a connection line between the power supply unit and the LED lighting unit, and a hold current for driving the dimmer connected to an output terminal of the power transistor.
  • the power transistor is a UHV (Ultra high voltage) NMOS transistor
  • the hold current source is characterized in that it comprises a low voltage transistor or a high voltage transistor.
  • the power transistor may further include a resistor between the drain and the gate and a zener diode between the gate and the ground.
  • the dimmer may be a phase-cut dimmer.
  • the power supply unit includes an AC power source and a rectifier circuit of the AC power source, characterized in that the dimmer is installed on the connection line between the AC power source and the rectifier circuit.
  • the first LED unit to the n-th LED unit of the LED lighting unit of the LED structure including a single LED or two or more LEDs connected in series, or a complex structure of a LED group including a single LED and two or more LEDs connected in series
  • the LED group which is formed as one and includes two or more LEDs, is characterized in that the longest distance LED is connected to the LED switching circuit unit based on the power supply unit.
  • the internal power generation unit may include a power transistor having an input terminal connected to a connection line between the power supply unit and the LED lighting unit, a diode connected to an output terminal of the power transistor, a capacitor connected to an output terminal of the diode, and an output terminal of the diode. It may be to include a voltage regulator connected in parallel with the capacitor.
  • a circuit configuration for driving a dimmer and a circuit configuration for generating an internal power source share a key element, thereby enabling implementation of a circuit for dimmer driving and internal power generation through a relatively small integrated circuit. It is possible to provide an AC LED driving circuit that can provide a stable power supply.
  • FIG. 1 is a view showing a conventional general AC LED driving circuit
  • FIG. 2 is a view illustrating a state in which a dimmer and a hold current source for driving a dimmer of a conventional AC LED driving circuit are added.
  • FIG. 3 is a view showing an AC LED driving circuit capable of supplying a stable power according to an embodiment of the present invention
  • FIG. 4 is a diagram illustrating a state in which an embodiment of a power transistor is applied to an AC LED driving circuit capable of supplying stable power of FIG. 3.
  • FIG. 3 is a view showing an AC LED driving circuit capable of supplying a stable power according to an embodiment of the present invention.
  • AC LED driving circuit 100 capable of supplying a stable power according to an embodiment of the present invention is a power supply unit 110, LED lighting unit 120, It is configured to include a plurality of LED switching circuit 130, the internal power generation unit 140.
  • the power supply unit 110 supplies external power to the AC LED driving circuit 100.
  • the AC LED driving circuit 100 receives external power through the power supply unit 110.
  • the power supply unit 110 may include an AC power source 111 and a rectifier circuit 112 of the AC power source 111, and a bridge diode may be used as the rectifier circuit 112.
  • the power supply unit 110 may further include a dimmer 113 installed on the connection line between the AC power supply 111 and the rectifier circuit 112, the dimmer 113 is a phase-cut (Phase-cut) Method of dimmer is used.
  • the LED lighting unit 120 includes an n-th LED unit located at the longest distance from the power supply unit 110, starting with the first LED unit 120-1 positioned at the shortest distance from the connection point with the power supply unit 110.
  • the first LED unit 120-1 to the n-th LED unit of the LED lighting unit 120 each include a single LED or a group of LEDs including two or more LEDs connected in series, or a single LED and two or more LEDs connected in series. It may be formed in the form of any one of the composite structure of the LED group.
  • the LED group including two or more LEDs may be the longest distance LED is connected to the LED switching circuit unit based on the power supply.
  • the present embodiment has taken the form of the LED lighting unit 120 is composed of the first LED unit 120-1 to the third LED unit 120-3, the first LED unit 120-1 in the drawing
  • Each of the third LED unit 120-3 is represented by one LED, but this is for convenience of illustration only, and each LED unit should be understood as a concept including both a single LED or two or more LEDs connected in series. .
  • the switching circuit unit 130 is a plurality, and is individually connected to the output terminals of one or more LEDs forming the first LED unit 120-1 to the n-th LED unit to form a current supply channel for the corresponding LED or the LED unit.
  • a detailed illustration and description of the switching circuit unit 130 are omitted.
  • the switching circuit unit 130 a form including a field effect transistor (MOS FET) and an OP amplifier comparator may be used.
  • the field effect transistor may have a form in which a drain is connected to the LED output terminal of the LED lighting unit 120, a source is connected to the ground resistance, and a gate is connected to the OP amplifier comparator.
  • the internal power generator 140 is connected in parallel on the connection line between the power supply 110 and the LED lighting unit 120 to generate internal power for the operation of the LED lighting unit 120.
  • the internal power generator 140 may include a power transistor 141, a hold current source 142, a diode 143, a capacitor 144, and a voltage regulator 145.
  • the power transistor 141 has an input terminal connected in parallel to a connection line between the power supply unit 110 and the LED lighting unit 120.
  • the power transistor 141 is an ultra high voltage (UHV) NMOS transistor, but the present invention is not limited thereto.
  • the power transistor 141 may be a drain-source voltage breakdown such as a JFET, an NMOS, or a BJT. Any kind of transistor may be used as long as it is a transistor driven at hundreds of Volt.
  • the power transistor 141 may further include a resistor 141a between the drain and the gate and a zener diode 141b between the gate and the ground, and the resistor 141a and the zener diode 141b is for a gate bias of the UHV NMOS transistor.
  • Ultra high voltage (UHV) NMOS transistors also increase in gate voltage when the drain voltage rises, and when the DC voltage exceeds the rough DC level, the UHV (Ultra high voltage) NMOS transistor is turned on and current flows in the capacitor.
  • the diode blocks the discharge path of the voltage charged in the capacitor, so that the voltage charged in the capacitor can be maintained above a predetermined value for the entire cycle.
  • the hold current source 142 is connected to the output terminal of the power transistor 141.
  • the hold current source 142 functions to turn on / off a hold current for dimmer driving.
  • the hold current source 142 may include a low voltage transistor or a high voltage transistor, and the power transistor 141 is disposed at an input side of the hold current source 142 such that the power transistor ( 141 acts as a clamp for the ultra-high voltage input.
  • the hold current source 142 for dimmer driving may be formed to have a significantly smaller size than the driving units for dimmer driving of the existing AC LED driving circuit.
  • the integrated circuit for driving the dimmer and generating the internal power source may be configured in the form of a single power transistor 141, which may significantly reduce the chip size of the integrated circuit.
  • the diode 143 is connected in parallel with the hold current source 142 at the output terminal of the power transistor 141.
  • the capacitor 144 is connected to the output terminal of the diode 143.
  • the voltage regulator 145 is connected in parallel with the capacitor 144 at the output terminal of the diode 143.
  • the circuit used for the voltage regulator 145 may be a circuit such as a conventional low drop-out (LDO).
  • the high voltage AC power through the power supply 110 is lowered once again while passing through the power transistor 141. That is, the AC power of the power supply unit 110 passes through the bridge diode that is the rectifier circuit 112, and the AC power thus rectified through the power transistor 141 again.
  • the function of the power transistor 141 is to filter out the high-voltage AC power once more to lower the level suitable for the internal power generation, thereby obtaining a predetermined level of rough voltage (rough DC input).
  • the power passing through the bridge diode which is the rectifier circuit 112 varies from 0 to 300 (V), but after passing through the power transistor 141 again rectified by the diode 143 and the capacitor 144.
  • the power source can be maintained at tens of volts (V).
  • V volts
  • the internal power generator 140 has a structure in which the hold current source 142 for driving the dimmer 113 and the structure for generating the internal power share the power transistor 141, so that the internal power generator 140 may be manufactured in a relatively small size when fabricating an integrated circuit. In addition, it can stably perform two functions such as dimmer driving and internal power generation.
  • the present invention can be widely used in the LED drive circuit.

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

Abstract

The present invention relates to an alternating current (AC) LED driving circuit capable of implementing a circuit for driving a dimmer and generating internal power through a relatively small-sized integration circuit by sharing core elements between a dimmer driving circuit and an internal power generation circuit. The AC LED driving circuit capable of supplying stable power, according to the present invention, comprises: a power supply unit to which external power is supplied and comprising a dimmer; an LED lighting unit comprising a first LED unit located at the shortest distance from a connection point with the power supply unit to an nth LED unit located at the longest distance from the power supply unit; a plurality of LED switching circuit units connected individually to an output end of one or at least two LEDs forming the first to nth LED units so as to form a current supply channel to a corresponding LED or LED unit; and an internal power generation unit connected in parallel to a connection line between the power supply unit and the LED lighting unit to generate internal power for operating the LED lighting unit, wherein the internal power generation unit comprises: a power transistor of which an input end is connected in parallel to the connection line between the power supply unit and the LED lighting unit; a hold current source connected to an output end of the power transistor to turn on/off a hold current for driving the dimmer; a diode connected in parallel to the hold current source at the output end of the power transistor; a capacitor connected to an output end of the diode; and a voltage regulator connected in parallel to the capacitor at the output end of the diode.

Description

안정적인 전원 공급이 가능한 교류 LED 구동회로AC LED drive circuit for stable power supply
본 발명은 교류 LED 구동회로에 관한 것으로서, 특히 디머 구동을 위한 회로 구성과 내부전원 생성을 위한 회로 구성이 핵심 소자를 공유하는 형태로 이루어져, 비교적 작은 크기의 집적회로를 통해 디머 구동 및 내부전원 생성용 회로의 구현을 가능케 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로에 관한 것이다.The present invention relates to an alternating current LED driving circuit, and in particular, the circuit configuration for driving the dimmer and the circuit configuration for generating the internal power source share a key element, and the dimmer driving and the internal power generation through the integrated circuit having a relatively small size. The present invention relates to an alternating current LED driving circuit capable of supplying a stable power supply to enable the implementation of an electronic circuit.
교류(AC) 전원 하에서 LED를 구동하는 방식으로 제안된 교류 LED 구동회로는 SMPS(Switched mode power supply) 방식에 비해 제조 과정이 단순하고 불량률이 낮으며 수명이 긴 장점이 있다.AC LED driving circuit proposed to drive LED under AC power has advantages of simple manufacturing process, low defect rate and long life compared with Switched mode power supply (SMPS) method.
도 1은 종래 일반적인 교류 LED 구동회로를 보인 도면으로써, 이러한 교류 LED 구동회로는 전류원(10)을 순차적으로 제어하는 것이 근본 원리이다.1 is a view showing a conventional general AC LED driving circuit, the AC LED driving circuit is a basic principle that sequentially controls the current source (10).
그리고 도 1의 교류 LED 구동회로를 이용하여 위상 절단(Phase-cut) 방식의 디머를 구동하기 위해서는 추가로 홀드 전류(hold current)를 흐르게 하는 전류원이 브리지(bridge) 회로와 첫 번째 LED 사이에 추가되어야 한다.In addition, in order to drive a phase-cut dimmer using the AC LED driving circuit of FIG. 1, an additional current source flowing a hold current is added between the bridge circuit and the first LED. Should be.
도 2를 참조하면, 도 2에서 홀드 전류(hold current)를 위한 전류원(20)은 기본적으로 LED 채널을 구동하는 회로와 유사한 수준의 성능과 기능을 가져야 하므로, LED 채널을 구성하는 전류원(10) ILEDn1∼ILEDn과 마찬가지로 수백 볼트(V) 급의 ultra-high-voltage transistor를 사용하여 구성함이 일반적이다.Referring to FIG. 2, since the current source 20 for hold current in FIG. 2 should basically have a similar level of performance and function as a circuit driving the LED channel, the current source 10 constituting the LED channel. Like ILEDn1 to ILEDn, it is common to use ultra-high-voltage transistor of several hundred volts (V) class.
그리고 교류 LED 구동회로의 전원부는 해당 교류 LED 구동회로에서 필요로 하는 성능 수준에 따라 여러 다양한 방법으로 설계될 수 있다. The power supply unit of the AC LED driving circuit may be designed in various ways according to the performance level required by the corresponding AC LED driving circuit.
예를 들어, 교류 LED 구동회로가 단순히 순차적인 광 제어만을 필요로 하여 높은 수준의 광 정밀도가 필요 없는 경우, 교류 LED 구동회로의 전원부를 교류 전원에 직렬 저항과 커패시터 등을 연결하여 단순 구성하는 방법이 있다.For example, when the AC LED driving circuit simply requires sequential light control and does not require a high level of optical accuracy, a method of simply configuring a power supply of the AC LED driving circuit by connecting a series resistor and a capacitor to the AC power source. There is this.
그러나 교류 LED 구동회로 또는 교류 LED 구동회로가 포함된 제품을 매우 높은 수준의 광 정밀도가 보장되는 동시에 온도 및 외부 조건에 상관없이 일정한 광 정밀도가 유지되는 형태로 제작 및 사용코자 한다면, 상기와 같은 교류 전원에 직렬 저항과 커패시터 등을 연결한 단순 구성의 전원부로는 그 구현에 어려움이 있다. 따라서 아날로그 회로에서 사용하는 정밀한 전원 공급을 위한 기술들이 사용되어야 한다.However, if an AC LED driving circuit or a product including an AC LED driving circuit is manufactured and used in a form that ensures a very high level of optical accuracy and maintains a constant optical accuracy regardless of temperature and external conditions, It is difficult to implement the power supply unit having a simple configuration in which a series resistor and a capacitor are connected to the power supply. Therefore, techniques for precise power supply used in analog circuits should be used.
이때, 아날로그용 정밀 전압 회로는 통상 저전압용 트랜지스터를 사용하여 설계되는데 비해, 교류 LED 구동회로의 전원은 90∼270Vac의 전원이므로, 이와 같이 높은 교류 전압을 전원으로써 직접 공급하는 데는 어려움이 따르는 동시에 효율적이지 못하다.In this case, the analog precision voltage circuit is usually designed using a low voltage transistor, whereas the power supply of the AC LED driving circuit is a power supply of 90 to 270 Vac. Not
본 발명은 상기와 같은 문제점을 해결하기 위해 제안된 것으로서, 디머 구동을 위한 회로 구성과 내부전원 생성을 위한 회로 구성이 핵심 소자를 공유하는 형태로 이루어져, 비교적 작은 크기의 집적회로를 통해 디머 구동 및 내부전원 생성용 회로의 구현을 가능케 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로를 제공하는데 목적이 있다.The present invention has been proposed to solve the above problems, and the circuit configuration for driving the dimmer and the circuit configuration for generating the internal power supply share a key element, and the dimmer driving and It is an object of the present invention to provide an AC LED driving circuit capable of supplying a stable power that enables the implementation of an internal power generation circuit.
상기와 같은 목적을 달성하기 위해 본 발명에 따른 안정적인 전원 공급이 가능한 교류 LED 구동회로는, 외부의 전원이 공급되는 전원공급부와, 상기 전원공급부와의 접속점으로부터 최단 거리에 위치한 제1 LED부를 시작으로 상기 전원공급부에서 최장 거리에 위치한 제n LED부를 포함하는 LED 조명부와, 상기 제1 LED부 내지 제n LED부를 형성하는 하나 또는 둘 이상의 LED의 출력단에 개별 접속되어 해당 LED나 LED부에 대한 전류 공급 채널을 형성하는 복수의 LED 스위칭 회로부와, 상기 전원공급부 및 상기 LED 조명부 간의 접속라인 상에 병렬 접속되어 상기 LED 조명부의 동작을 위한 내부전원을 생성하는 내부전원 생성부를 포함하여 구성된다.In order to achieve the above object, the AC LED driving circuit capable of supplying stable power according to the present invention includes a power supply unit to which external power is supplied and a first LED unit located at a shortest distance from a connection point with the power supply unit. An LED lighting unit including an n-th LED unit located at the longest distance from the power supply unit, and individually connected to the output terminal of one or more LEDs forming the first to n-th LED unit to supply current to the corresponding LED or LED unit And a plurality of LED switching circuits forming a channel, and an internal power generation unit connected in parallel on a connection line between the power supply unit and the LED lighting unit to generate internal power for the operation of the LED lighting unit.
또한 상기 전원공급부는 디머를 더 포함하며, 상기 내부전원 생성부는 상기 전원공급부 및 LED 조명부 간의 접속라인에 입력단이 병렬 접속되는 파워 트랜지스터와, 상기 파워 트랜지스터의 출력단에 접속되고 상기 디머 구동용의 홀드 전류(hold current) 온/오프를 위한 홀드 전류원과, 상기 파워 트랜지스터의 출력단에 상기 홀드 전류원과 병렬 접속되는 다이오드와, 상기 다이오드의 출력단에 접속되는 커패시터와, 상기 다이오드의 출력단에 상기 커패시터와 병렬 접속되는 전압 레귤레이터를 포함하는 것을 특징으로 한다.The power supply unit may further include a dimmer, and the internal power generation unit includes a power transistor having an input terminal connected in parallel to a connection line between the power supply unit and the LED lighting unit, and a hold current for driving the dimmer connected to an output terminal of the power transistor. a hold current source for on / off, a diode connected in parallel with the hold current source at an output terminal of the power transistor, a capacitor connected with an output terminal of the diode, and a parallel connection with the capacitor at an output terminal of the diode And a voltage regulator.
또한 상기 파워 트랜지스터는 UHV(Ultra high voltage) NMOS 트랜지스터이며, 상기 홀드 전류원은 저전압(low voltage) 트랜지스터 또는 고전압(high voltage) 트랜지스터를 포함하는 것을 특징으로 한다.In addition, the power transistor is a UHV (Ultra high voltage) NMOS transistor, the hold current source is characterized in that it comprises a low voltage transistor or a high voltage transistor.
또한 상기 파워 트랜지스터는 드레인과 게이트 사이의 저항 및 게이트와 접지 사이의 제너 다이오드를 더 포함하는 것을 특징으로 한다.The power transistor may further include a resistor between the drain and the gate and a zener diode between the gate and the ground.
또한 상기 디머는 위상 절단(Phase-cut) 방식의 디머인 것을 특징으로 한다.The dimmer may be a phase-cut dimmer.
또한 상기 전원공급부는 교류전원 및 상기 교류전원의 정류회로를 포함하며, 상기 교류전원 및 정류회로 간의 접속라인 상에 상기 디머가 설치되는 것을 특징으로 한다.In addition, the power supply unit includes an AC power source and a rectifier circuit of the AC power source, characterized in that the dimmer is installed on the connection line between the AC power source and the rectifier circuit.
또한 상기 LED 조명부의 제1 LED부 내지 제n LED부는 각각 단일의 LED 또는 직렬 연결되는 둘 이상의 LED가 포함된 LED 그룹 또는 단일의 LED 및 직렬 연결되는 둘 이상의 LED가 포함된 LED 그룹의 복합 구조 중 어느 하나로 형성되며, 둘 이상의 LED가 포함된 LED 그룹은 상기 전원공급부를 기준으로 최장 거리의 LED가 상기 LED 스위칭 회로부와 접속되는 것을 특징으로 한다.In addition, the first LED unit to the n-th LED unit of the LED lighting unit of the LED structure including a single LED or two or more LEDs connected in series, or a complex structure of a LED group including a single LED and two or more LEDs connected in series The LED group, which is formed as one and includes two or more LEDs, is characterized in that the longest distance LED is connected to the LED switching circuit unit based on the power supply unit.
또한 상기 내부전원 생성부는 상기 전원공급부 및 상기 LED 조명부 간의 접속라인에 입력단이 접속되는 파워 트랜지스터와, 상기 파워 트랜지스터의 출력단에 접속되는 다이오드와, 상기 다이오드의 출력단에 접속되는 커패시터와, 상기 다이오드의 출력단에 상기 커패시터와 병렬 접속되는 전압 레귤레이터를 포함하는 것일 수 있다.The internal power generation unit may include a power transistor having an input terminal connected to a connection line between the power supply unit and the LED lighting unit, a diode connected to an output terminal of the power transistor, a capacitor connected to an output terminal of the diode, and an output terminal of the diode. It may be to include a voltage regulator connected in parallel with the capacitor.
본 발명에 따르면, 디머 구동을 위한 회로 구성과 내부전원 생성을 위한 회로 구성이 핵심 소자를 공유하는 형태로 이루어져, 비교적 작은 크기의 집적회로를 통해 디머 구동 및 내부전원 생성용 회로의 구현을 가능케 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로를 제공할 수 있다.According to the present invention, a circuit configuration for driving a dimmer and a circuit configuration for generating an internal power source share a key element, thereby enabling implementation of a circuit for dimmer driving and internal power generation through a relatively small integrated circuit. It is possible to provide an AC LED driving circuit that can provide a stable power supply.
도 1은 종래 일반적인 교류 LED 구동회로를 보인 도면1 is a view showing a conventional general AC LED driving circuit
도 2는 종래 일반적인 교류 LED 구동회로의 디머 및 디머 구동을 위한 홀드(hold) 전류원이 추가된 상태를 보인 도면FIG. 2 is a view illustrating a state in which a dimmer and a hold current source for driving a dimmer of a conventional AC LED driving circuit are added.
도 3은 본 발명의 일 실시예에 따른 안정적인 전원 공급이 가능한 교류 LED 구동회로를 보인 도면3 is a view showing an AC LED driving circuit capable of supplying a stable power according to an embodiment of the present invention
도 4는 도 3의 안정적인 전원 공급이 가능한 교류 LED 구동회로에서 파워 트랜지스터의 일 실시예를 적용한 상태를 보인 도면4 is a diagram illustrating a state in which an embodiment of a power transistor is applied to an AC LED driving circuit capable of supplying stable power of FIG. 3.
이하에서는 첨부된 도면을 참조하여 본 발명의 일 실시예에 따른 안정적인 전원 공급이 가능한 교류 LED 구동회로를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail an AC LED driving circuit capable of supplying a stable power according to an embodiment of the present invention.
도 3은 본 발명의 일 실시예에 따른 안정적인 전원 공급이 가능한 교류 LED 구동회로를 보인 도면이다.3 is a view showing an AC LED driving circuit capable of supplying a stable power according to an embodiment of the present invention.
도시된 바와 같이, 본 발명의 일 실시예에 따른 안정적인 전원 공급이 가능한 교류 LED 구동회로(100: 이하, “교류 LED 구동회로”라 약칭함)는 전원공급부(110), LED 조명부(120), 복수의 LED 스위칭 회로부(130), 내부전원 생성부(140)를 포함하여 구성된다.As shown, AC LED driving circuit 100 (hereinafter, abbreviated as "AC LED driving circuit") capable of supplying a stable power according to an embodiment of the present invention is a power supply unit 110, LED lighting unit 120, It is configured to include a plurality of LED switching circuit 130, the internal power generation unit 140.
전원공급부(110)는 외부 전원을 교류 LED 구동회로(100)에 공급한다. 다시 말해, 교류 LED 구동회로(100)는 전원공급부(110)를 통해 외부 전원을 공급 받는다. 그리고 전원공급부(110)는 교류전원(111) 및 교류전원(111)의 정류회로(112)를 포함하여 구성될 수 있으며, 정류회로(112)로는 브리지 다이오드(bridge diode)가 사용될 수 있다. 또한 전원공급부(110)는 교류전원(111) 및 정류회로(112) 간의 접속라인 상에 설치되는 디머(113)를 더 포함하여 구성될 수 있고, 디머(113)는 위상 절단(Phase-cut) 방식의 디머가 사용된다.The power supply unit 110 supplies external power to the AC LED driving circuit 100. In other words, the AC LED driving circuit 100 receives external power through the power supply unit 110. The power supply unit 110 may include an AC power source 111 and a rectifier circuit 112 of the AC power source 111, and a bridge diode may be used as the rectifier circuit 112. In addition, the power supply unit 110 may further include a dimmer 113 installed on the connection line between the AC power supply 111 and the rectifier circuit 112, the dimmer 113 is a phase-cut (Phase-cut) Method of dimmer is used.
LED 조명부(120)는 전원공급부(110)와의 접속점으로부터 최단 거리에 위치한 제1 LED부(120-1)를 시작으로 전원공급부(110)에서 최장 거리에 위치한 제n LED부를 포함하여 구성된다. 그리고 LED 조명부(120)의 제1 LED부(120-1) 내지 제n LED부는 각각 단일의 LED 또는 직렬 연결되는 둘 이상의 LED가 포함된 LED 그룹 또는 단일의 LED 및 직렬 연결되는 둘 이상의 LED가 포함된 LED 그룹의 복합 구조 중 어느 하나의 형태로 형성될 수 있다. 또한 둘 이상의 LED가 포함된 LED 그룹은 전원공급부를 기준으로 최장 거리의 LED가 LED 스위칭 회로부와 접속되는 것일 수 있다.The LED lighting unit 120 includes an n-th LED unit located at the longest distance from the power supply unit 110, starting with the first LED unit 120-1 positioned at the shortest distance from the connection point with the power supply unit 110. The first LED unit 120-1 to the n-th LED unit of the LED lighting unit 120 each include a single LED or a group of LEDs including two or more LEDs connected in series, or a single LED and two or more LEDs connected in series. It may be formed in the form of any one of the composite structure of the LED group. In addition, the LED group including two or more LEDs may be the longest distance LED is connected to the LED switching circuit unit based on the power supply.
참고로, 본 실시예는 LED 조명부(120)가 제1 LED부(120-1) 내지 제3 LED부(120-3)로 이루어지는 형태를 예로 하였으며, 또한 도면에서 제1 LED부(120-1) 내지 제3 LED부(120-3)를 각각 하나의 LED로 표현하였으나, 이는 도시의 편의를 위한 것일 뿐, 각각의 LED부는 단일의 LED 또는 직렬 연결된 둘 이상의 LED를 모두 포함하는 개념으로 이해해야 한다.For reference, the present embodiment has taken the form of the LED lighting unit 120 is composed of the first LED unit 120-1 to the third LED unit 120-3, the first LED unit 120-1 in the drawing Each of the third LED unit 120-3 is represented by one LED, but this is for convenience of illustration only, and each LED unit should be understood as a concept including both a single LED or two or more LEDs connected in series. .
스위칭 회로부(130)는 복수로써, 제1 LED부(120-1) 내지 제n LED부를 형성하는 하나 또는 둘 이상의 LED의 출력단에 개별 접속되어 해당 LED나 LED부에 대한 전류 공급 채널을 형성한다. 그리고 본 실시예에서는 스위칭 회로부(130)에 대한 상세 도시 및 설명은 생략하였으며, 이러한 스위칭 회로부(130)의 일 예로써, 전계효과 트랜지스터(MOS FET) 및 OP 앰프 비교기를 포함하는 형태가 사용될 수 있으며, 여기서 전계효과 트랜지스터는 LED 조명부(120)의 LED 출력단에 드레인이 접속되고, 접지저항에 소스가 접속되며, OP 앰프 비교기에 게이트가 접속되는 형태일 수 있다.The switching circuit unit 130 is a plurality, and is individually connected to the output terminals of one or more LEDs forming the first LED unit 120-1 to the n-th LED unit to form a current supply channel for the corresponding LED or the LED unit. In this embodiment, a detailed illustration and description of the switching circuit unit 130 are omitted. As an example of the switching circuit unit 130, a form including a field effect transistor (MOS FET) and an OP amplifier comparator may be used. In this case, the field effect transistor may have a form in which a drain is connected to the LED output terminal of the LED lighting unit 120, a source is connected to the ground resistance, and a gate is connected to the OP amplifier comparator.
내부전원 생성부(140)는 전원공급부(110) 및 LED 조명부(120) 간의 접속라인 상에 병렬 접속되어 LED 조명부(120)의 동작을 위한 내부전원을 생성한다.The internal power generator 140 is connected in parallel on the connection line between the power supply 110 and the LED lighting unit 120 to generate internal power for the operation of the LED lighting unit 120.
그리고 이러한 내부전원 생성부(140)는 파워 트랜지스터(141), 홀드 전류원(142), 다이오드(143), 커패시터(144), 전압 레귤레이터(145)를 포함하여 구성될 수 있다.The internal power generator 140 may include a power transistor 141, a hold current source 142, a diode 143, a capacitor 144, and a voltage regulator 145.
파워 트랜지스터(141)는 전원공급부(110) 및 LED 조명부(120) 간의 접속라인에 입력단이 병렬 접속된다. 그리고 본 실시예에서는 파워 트랜지스터(141)가 UHV(Ultra high voltage) NMOS 트랜지스터인 것을 예로 하였으나, 본 발명이 이에 한정되는 것은 아니며, 파워 트랜지스터(141)는 JFET, NMOS, BJT 등 drain-source voltage breakdown이 수백 Volt 급으로 구동되는 트랜지스터이면 어느 종류가 사용되어도 무방하다.The power transistor 141 has an input terminal connected in parallel to a connection line between the power supply unit 110 and the LED lighting unit 120. In the present embodiment, the power transistor 141 is an ultra high voltage (UHV) NMOS transistor, but the present invention is not limited thereto. The power transistor 141 may be a drain-source voltage breakdown such as a JFET, an NMOS, or a BJT. Any kind of transistor may be used as long as it is a transistor driven at hundreds of Volt.
또한, 도 4를 참조하면, 파워 트랜지스터(141)는 드레인과 게이트 사이의 저항(141a) 및 게이트와 접지 사이의 제너 다이오드(141b)를 더 포함하는 형태일 수 있고, 저항(141a) 및 제너 다이오드(141b)는 UHV NMOS 트랜지스터의 게이트 바이어스를 위한 용도이다. 이러한 UHV(Ultra high voltage) NMOS 트랜지스터는 드레인 전압이 상승하면 게이트 전압 역시 동반 상승하며, Rough DC level을 넘어설 경우 UHV(Ultra high voltage) NMOS 트랜지스터는 켜지는 동시에 전류는 흘러 커패시터에 충전된다. 이와 반대로 드레인 전압이 하강하여 Rough DC level 아래로 떨어지면, 다이오드가 커패시터에 충전된 전압의 방전 경로를 차단하므로, 전 사이클(cycle)에 대해 커패시터에 충전된 전압은 일정값 이상으로 유지될 수 있다.Also, referring to FIG. 4, the power transistor 141 may further include a resistor 141a between the drain and the gate and a zener diode 141b between the gate and the ground, and the resistor 141a and the zener diode 141b is for a gate bias of the UHV NMOS transistor. Ultra high voltage (UHV) NMOS transistors also increase in gate voltage when the drain voltage rises, and when the DC voltage exceeds the rough DC level, the UHV (Ultra high voltage) NMOS transistor is turned on and current flows in the capacitor. On the contrary, when the drain voltage falls and falls below the rough DC level, the diode blocks the discharge path of the voltage charged in the capacitor, so that the voltage charged in the capacitor can be maintained above a predetermined value for the entire cycle.
이하 내부전원 생성부(140)에 대해 도 4를 참조하여 계속 설명한다.Hereinafter, the internal power generator 140 will be described with reference to FIG. 4.
홀드 전류원(142)은 파워 트랜지스터(141)의 출력단에 접속되며, 이러한 홀드 전류원(142)은 디머 구동용의 홀드 전류(hold current)를 온/오프하는 기능을 한다. 그리고 이러한 홀드 전류원(142)은 저전압(low voltage) 트랜지스터 또는 고전압(high voltage) 트랜지스터를 포함하여 형성될 수 있으며, 이는 홀드 전류원(142)의 입력단 쪽에 파워 트랜지스터(141)가 배치되어 이러한 파워 트랜지스터(141)가 ultra-high voltage 입력에 대한 클램프(clamp) 역할을 하는 것에 기인한다. 그리고 이를 통해 디머 구동을 위한 홀드 전류원(142)은 기존 교류 LED 구동회로의 디머 구동을 위한 구동부들과 비교하여 현저하게 작은 크기로 형성될 수 있다.The hold current source 142 is connected to the output terminal of the power transistor 141. The hold current source 142 functions to turn on / off a hold current for dimmer driving. In addition, the hold current source 142 may include a low voltage transistor or a high voltage transistor, and the power transistor 141 is disposed at an input side of the hold current source 142 such that the power transistor ( 141 acts as a clamp for the ultra-high voltage input. In addition, the hold current source 142 for dimmer driving may be formed to have a significantly smaller size than the driving units for dimmer driving of the existing AC LED driving circuit.
다시 말해, 디머 구동 및 내부전원 생성을 위한 집적회로의 구성을 단일의 파워 트랜지스터(141)를 포함하는 형태로 구성할 수 있는바, 해당 집적회로의 칩 크기를 현저히 줄일 수 있다.In other words, the integrated circuit for driving the dimmer and generating the internal power source may be configured in the form of a single power transistor 141, which may significantly reduce the chip size of the integrated circuit.
다이오드(143)는 파워 트랜지스터(141)의 출력단에 홀드 전류원(142)과 병렬 접속된다.The diode 143 is connected in parallel with the hold current source 142 at the output terminal of the power transistor 141.
커패시터(144)는 다이오드(143)의 출력단에 접속된다.The capacitor 144 is connected to the output terminal of the diode 143.
전압 레귤레이터(145)는 다이오드(143)의 출력단에 커패시터(144)와 병렬 접속된다. 그리고 전압 레귤레이터(145)에 사용되는 회로는 통상의 LDO(low drop-out) 등의 회로가 사용될 수 있다.The voltage regulator 145 is connected in parallel with the capacitor 144 at the output terminal of the diode 143. The circuit used for the voltage regulator 145 may be a circuit such as a conventional low drop-out (LDO).
상기한 구성의 내부전원 생성부(140)에 의해서, 전원공급부(110)를 통한 고전압의 교류 전원이 파워 트랜지스터(141)를 통과하면서 다시 한 번 낮춰진다. 즉, 전원공급부(110)의 교류 전원이 정류회로(112)인 브리지 다이오드를 통과하고, 이렇게 전파 정류된 교류 전원이 다시 파워 트랜지스터(141)를 통과한다. 이때, 파워 트랜지스터(141)의 기능은 고전압의 교류 전원을 한 번 더 걸러주어 내부전원 생성에 적합한 수준으로 낮추고, 이를 통해 소정 수준의 평탄한 전압(rough DC input)을 얻을 수 있게 한다.By the internal power generator 140 having the above-described configuration, the high voltage AC power through the power supply 110 is lowered once again while passing through the power transistor 141. That is, the AC power of the power supply unit 110 passes through the bridge diode that is the rectifier circuit 112, and the AC power thus rectified through the power transistor 141 again. At this time, the function of the power transistor 141 is to filter out the high-voltage AC power once more to lower the level suitable for the internal power generation, thereby obtaining a predetermined level of rough voltage (rough DC input).
예를 들면, 정류회로(112)인 브리지 다이오드를 통과한 전원은 0∼300(V)까지 변화되지만, 파워 트랜지스터(141)를 통과한 후 다시 다이오드(143)와 커패시터(144)에 의해 정류된 전원은 수십 볼트(V) 급으로 유지될 수 있다.For example, the power passing through the bridge diode, which is the rectifier circuit 112, varies from 0 to 300 (V), but after passing through the power transistor 141 again rectified by the diode 143 and the capacitor 144. The power source can be maintained at tens of volts (V).
그리고 이렇게 수십 볼트(V) 급으로 낮춰진 부정확하고 출렁이는 전원은 전압 레귤레이터(145)를 통과하여 매우 안정적이고 정확한 값을 갖는 상태가 되며, 이렇게 안정적이고 정확한 값의 전원이 내부전원, 다시 말해 내부 회로용 전원으로 사용될 수 있게 된다. And the inaccurate and swollen power source lowered to several tens of volts (V) is passed through the voltage regulator 145 to have a very stable and accurate value. It can be used as a power source for internal circuits.
또한 내부전원 생성부(140)는 디머(113) 구동을 위한 홀드 전류원(142)과 내부전원 생성을 위한 구조가 파워 트랜지스터(141)를 공유하는 구조이므로, 집적회로로 제작시 비교적 작은 크기로 제작되면서도 디머 구동 및 내부전원 생성의 두 가지 기능을 안정적으로 발휘할 수 있다.In addition, the internal power generator 140 has a structure in which the hold current source 142 for driving the dimmer 113 and the structure for generating the internal power share the power transistor 141, so that the internal power generator 140 may be manufactured in a relatively small size when fabricating an integrated circuit. In addition, it can stably perform two functions such as dimmer driving and internal power generation.
이상에서 설명한 것은 본 발명에 따른 안정적인 전원 공급이 가능한 교류 LED 구동회로를 실시하기 위한 하나의 실시예에 불과한 것으로서, 본 발명은 상기한 실시 예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 바와 같이 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능한 범위까지 본 발명의 기술적 정신이 있다고 할 것이다.What has been described above is only one embodiment for implementing an AC LED driving circuit capable of supplying a stable power according to the present invention, the present invention is not limited to the above-described embodiment, as claimed in the following claims As described above, any person having ordinary knowledge in the field of the present invention without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.
본 발명은 LED 구동회로에 광범위하게 사용될 수 있다.The present invention can be widely used in the LED drive circuit.

Claims (7)

  1. 외부의 전원이 공급되는 전원공급부;A power supply unit to which external power is supplied;
    상기 전원공급부와의 접속점으로부터 최단 거리에 위치한 제1 LED부를 시작으로 상기 전원공급부에서 최장 거리에 위치한 제n LED부를 포함하는 LED 조명부;An LED lighting unit including an n-th LED unit located at a longest distance from the power supply unit, including a first LED unit located at a shortest distance from a connection point with the power supply unit;
    상기 제1 LED부 내지 제n LED부를 형성하는 하나 또는 둘 이상의 LED의 출력단에 개별 접속되어 해당 LED나 LED부에 대한 전류 공급 채널을 형성하는 복수의 LED 스위칭 회로부;A plurality of LED switching circuit units individually connected to output terminals of one or more LEDs forming the first to n-th LED units to form current supply channels for the corresponding LEDs or LED units;
    상기 전원공급부 및 상기 LED 조명부 간의 접속라인 상에 병렬 접속되어 상기 LED 조명부의 동작을 위한 내부전원을 생성하는 내부전원 생성부를 포함하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.An AC LED driving circuit capable of supplying stable power including an internal power generation unit connected in parallel on the connection line between the power supply unit and the LED lighting unit to generate internal power for the operation of the LED lighting unit.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 전원공급부는 디머를 더 포함하며,The power supply unit further includes a dimmer,
    상기 내부전원 생성부는 The internal power generation unit
    상기 전원공급부 및 LED 조명부 간의 접속라인에 입력단이 병렬 접속되는 파워 트랜지스터;A power transistor having an input terminal connected in parallel to a connection line between the power supply unit and the LED lighting unit;
    상기 파워 트랜지스터의 출력단에 접속되고 상기 디머 구동용의 홀드 전류(hold current) 온/오프를 위한 홀드 전류원;A hold current source connected to an output terminal of the power transistor and configured to turn on / off a hold current for driving the dimmer;
    상기 파워 트랜지스터의 출력단에 상기 홀드 전류원과 병렬 접속되는 다이오드;A diode connected in parallel with the hold current source to an output terminal of the power transistor;
    상기 다이오드의 출력단에 접속되는 커패시터;A capacitor connected to the output terminal of the diode;
    상기 다이오드의 출력단에 상기 커패시터와 병렬 접속되는 전압 레귤레이터를 포함하는 것을 특징으로 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.And a voltage regulator connected in parallel with the capacitor at an output terminal of the diode.
  3. 제 2 항에 있어서,The method of claim 2,
    상기 파워 트랜지스터는 UHV(Ultra high voltage) NMOS 트랜지스터이며, 상기 홀드 전류원은 저전압(low voltage) 트랜지스터 또는 고전압(high voltage) 트랜지스터를 포함하는 것을 특징으로 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.The power transistor is a UHV (Ultra high voltage) NMOS transistor, and the hold current source includes a low voltage transistor (high voltage) or a high voltage (high voltage) transistor, characterized in that the AC LED drive circuit capable of supplying power.
  4. 제 2 항에 있어서,The method of claim 2,
    상기 파워 트랜지스터는 드레인과 게이트 사이의 저항 및 게이트와 접지 사이의 제너 다이오드를 더 포함하는 것을 특징으로 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.The power transistor may further include a resistor between a drain and a gate, and a Zener diode between the gate and the ground.
  5. 제 2 항에 있어서,The method of claim 2,
    상기 디머는 위상 절단(Phase-cut) 방식의 디머인 것을 특징으로 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.The dimmer is an alternating current LED driving circuit capable of supplying a stable power, characterized in that the phase-cut (Phase-cut) dimmer.
  6. 제 2 항에 있어서,The method of claim 2,
    상기 전원공급부는 교류전원 및 상기 교류전원의 정류회로를 포함하며, 상기 교류전원 및 정류회로 간의 접속라인 상에 상기 디머가 설치되는 것을 특징으로 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.The power supply unit includes an AC power source and a rectifier circuit of the AC power source, AC power supply circuit for stable power supply, characterized in that the dimmer is installed on the connection line between the AC power source and the rectifier circuit.
  7. 제 1 항에 있어서,The method of claim 1,
    상기 LED 조명부의 제1 LED부 내지 제n LED부는 각각 단일의 LED 또는 직렬 연결되는 둘 이상의 LED가 포함된 LED 그룹 또는 단일의 LED 및 직렬 연결되는 둘 이상의 LED가 포함된 LED 그룹의 복합 구조 중 어느 하나로 형성되며, 둘 이상의 LED가 포함된 LED 그룹은 상기 전원공급부를 기준으로 최장 거리의 LED가 상기 LED 스위칭 회로부와 접속되는 것을 특징으로 하는 안정적인 전원 공급이 가능한 교류 LED 구동회로.The first LED unit to the n-th LED unit of the LED lighting unit each of a single LED or LED group including two or more LEDs connected in series or a complex structure of a single LED and LED group including two or more LEDs connected in series Formed as one, LED group including two or more LED is the AC LED driving circuit capable of a stable power supply, characterized in that the longest distance LED is connected to the LED switching circuit unit based on the power supply.
PCT/KR2014/009148 2013-10-02 2014-09-30 Alternating current led driving circuit capable of supplying stable power WO2015050349A1 (en)

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