WO2014069939A1 - Led light driver circuit having radiation compensation function during change in power supply voltage - Google Patents

Led light driver circuit having radiation compensation function during change in power supply voltage Download PDF

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Publication number
WO2014069939A1
WO2014069939A1 PCT/KR2013/009852 KR2013009852W WO2014069939A1 WO 2014069939 A1 WO2014069939 A1 WO 2014069939A1 KR 2013009852 W KR2013009852 W KR 2013009852W WO 2014069939 A1 WO2014069939 A1 WO 2014069939A1
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Prior art keywords
power supply
unit
voltage
led
power
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PCT/KR2013/009852
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French (fr)
Korean (ko)
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신소봉
권옥환
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메를로랩 주식회사
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Publication of WO2014069939A1 publication Critical patent/WO2014069939A1/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
    • 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
    • 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
    • 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]

Definitions

  • the present invention relates to an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes.
  • the change in the final LED emission amount is minimized and thus the LED
  • the present invention relates to an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes to maintain a stable operating state without light flickering or shaking even in an unstable power supply state.
  • the LED Light Emitting Diode
  • the LED is a current driving device, and can operate normally when a constant current is stably supplied.
  • LEDs that require high power generate a lot of heat in the LEDs themselves because of the large driving current (typically 350 mA or more), and thus the degradation rate of luminance is greater than that of LEDs at low power. This is directly linked to the lifetime of the LED and is very important in the lighting market.
  • the AC power is directly applied to the heat of the LED, and the number of LEDs suitable for the voltage value of the AC power that changes in time is selected, and the current source is arranged in parallel so that only the selected LED is turned on. That's the way it is.
  • buck, fly-back, and PSR fly-back which can be classified as a conventional switched mode power supply (SMPS) method, basically drive an LED by converting an AC power into a DC voltage, but using an AC direct LED
  • SMPS switched mode power supply
  • AC power is basically applied directly to the heat of the LED.
  • FIG. 1 is a conceptual view of an LED lighting driving circuit of a conventional AC direct method, which is an example in which there is no dimmer, and includes an AC power supply 10, a rectifier rectifier 20, and a plurality of LEDs 31 to 34. And current sources 41 to 44 corresponding to the number of LEDs 31 to 34, and an algorithm circuit for controlling the entire circuit.
  • FIG. 2 conceptually shows a conventional AC direct type LED lighting driving circuit having a dimmer, and similarly to FIG. 1, an AC power source 10, a wave rectifier 20, a plurality of LEDs 31 to 34, and A current source 41 to 44 corresponding to the number of LEDs 31 to 34, and an algorithm circuit for controlling the entire circuit, and at the same time, bleeding for stable driving of the dimmer 50 and the dimmer 50.
  • a current source 60 Further includes a current source 60.
  • the AC direct type LED lighting driving circuit according to the present invention does not require a large value inductor or transformer when compared with the aforementioned SMPS type LED driving circuit.
  • advantages such as not requiring large value electrolytic capacitors and relatively simple control algorithms, which in turn have an advantage in component count, manufacturing process and module size.
  • the AC direct type LED lighting driving circuit according to FIGS. 1 and 2 has the above advantages, when the magnitude of the AC voltage changes momentarily, the brightness of the LED also reacts instantaneously, and the magnitude of the AC voltage is periodic. The brightness of the LED also reacts periodically when it changes to, which is seen as a bad behavior of flickering and shaking of the LED lights in the eyes of the user.
  • the unstable AC voltage may change the LED brightness in the actual operating environment, but the SMPS type LED lighting driving circuit basically changes the AC to DC. It plays a role, and it is clear that the AC power supply has a structural advantage of operating in a reduced form even if the AC power is unstable.
  • the conventional AC direct type LED lighting driving circuit is basically a system that lights up the LED properly when a power supply voltage is generated. Accordingly, the conventional AC direct type LED lighting driving circuit changes each current source when the absolute value of the AC voltage changes. This flashing section also changes accordingly.
  • FIG. 3 shows a change in current waveform according to a change in power in a conventional LED lighting driving circuit (when there is no dimmer) of an AC direct type, and (b) shows a conventional In the AC direct type LED lighting driving circuit (when there is no dimmer), the current waveform is changed according to the power change.
  • the present invention even if the absolute value change of the AC power is generated in the AC direct type LED lighting driving circuit, the change of the final LED light emission is minimized and accordingly, the LED light is stable without generating flickering or shaking of the light even in an unstable power state. It is an object of the present invention to provide an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes to maintain and display a lighting function.
  • the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes includes a power supply unit to which an external AC power is supplied and a rectifying circuit of AC power applied through the power supply unit. And a power supply unit including an nth LED located at a longest distance from the power supply unit, starting with a first LED located at the shortest distance from the connection point with the power supply unit, and the first LEDs being connected to the power supply unit, and each LED being in series.
  • a plurality of switching circuit units connected to an LED lighting unit connected to each other, an output terminal of each LED forming the LED lighting unit to form a current supply channel for the corresponding LED, and connected in parallel to a connection line between the power supply unit and the first LED; Outputs an adjustment signal of the current value supplied to the LED lighting unit when the absolute value of the AC power input through the power supply unit changes
  • a reference voltage supply unit configured to apply a reference voltage to each of the switching circuit units based on a signal input from the power supply voltage correction unit.
  • the power supply unit may further include a dimmer connected to the power supply unit to receive an AC voltage and to apply an output voltage to the rectifier circuit.
  • the power supply voltage corrector may include an average voltage value calculator connected in parallel with a connection line between the power supply unit and the first LED, an instantaneous voltage value detector connected in parallel with a connection line between the power supply unit and the first LED, and the average value.
  • An operation unit that receives the output voltage values of the voltage value calculation unit and the instantaneous voltage value detection unit, calculates a difference between the two voltage values, and outputs a value obtained by multiplying the corresponding gain by a specific gain;
  • a reference voltage value correction unit which calculates a correction value of the reference voltage value by subtracting the entire reference voltage value and inputs the correction value to the reference voltage supply unit.
  • the power supply voltage correction unit may be installed in a connection line between any one or both of the average voltage value calculation unit and the instantaneous voltage value detection unit and the power supply unit to convert AC power inputted through the power supply unit into the driving voltage of the LED lighting driving circuit. It characterized in that it further comprises a voltage regulator for lowering.
  • the voltage adjusting unit may be connected in series to a connection line between the power supply unit and the average voltage value calculating unit, and the instantaneous voltage value detecting unit may be connected in parallel to the connection line between the voltage adjusting unit and the average voltage value calculating unit.
  • the average voltage value calculating unit may calculate an average voltage value by averaging the magnitude of the power supply voltage of the waveform reference inputted through the voltage adjusting unit.
  • the average voltage value calculating unit may calculate the average voltage value by averaging the total magnitude of the input power voltage for one hour or more on a pulse waveform basis.
  • the voltage adjusting unit may be connected in parallel to a connection line between the rectifier circuit and the first LED to receive AC power of the power supply unit as an input signal or to be connected in parallel to a connection line between the power supply unit and the rectifier circuit. Characterized in that it is input as an input signal.
  • connection line of the voltage adjuster connected in parallel to the connection line between the power supply and the rectifier circuit is provided with a pair of resistors connected in series to branch the connection line to the voltage adjuster between the pair of resistors.
  • the instantaneous voltage value detector may detect the voltage level of the waveform as the instantaneous voltage value when the magnitude of the power supply voltage of the waveform reference inputted through the voltage adjuster changes instantaneously.
  • the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes in accordance with the present invention further includes a common ground resistance to which the switching circuit parts are commonly grounded, wherein the switching circuit part is connected to the LED output terminal of the LED driving part.
  • the switching element may be a field effect transistor (MOS FET) having a drain connected to an LED output terminal of the LED driver, a source connected to the common ground resistor, and a gate connected to the comparator.
  • MOS FET field effect transistor
  • the LED lighting does not cause flickering or shaking of the light even in an unstable power state. It can maintain and exert stable lighting function.
  • FIG. 1 is a circuit diagram conceptually illustrating a form without a dimmer of a conventional AC direct type LED driving circuit.
  • FIG. 2 is a circuit diagram conceptually illustrating a form having a dimmer of a conventional AC direct type LED driving circuit.
  • FIG. 3 is a view illustrating a change in current waveform according to a power supply change in a conventional AC direct type LED driving circuit
  • FIG. 4 is a circuit diagram conceptually showing an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes according to the present invention.
  • FIG. 5 is a circuit diagram conceptually showing another example of an LED lighting driving circuit having a light quantity compensation function when a power supply voltage is changed according to the present invention.
  • FIG. 6 is a circuit diagram illustrating an LED lighting driving circuit having a light amount compensation function when a power supply voltage is changed according to an exemplary embodiment of the present invention.
  • FIG. 7 is a circuit diagram illustrating an LED lighting driving circuit having a light amount compensation function when a power supply voltage is changed according to another embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a change in current waveform according to a power supply change in an LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes according to embodiments of the present invention.
  • FIG. 4 is a circuit diagram conceptually illustrating an LED lighting driving circuit having a light quantity compensation function when a power supply voltage is changed according to the present invention.
  • the LED lighting driving circuit 100 (hereinafter referred to as "LED lighting driving circuit") having a light quantity compensation function when the power supply voltage changes in accordance with the present invention is a power supply unit 110, LED lighting unit 120, switching circuit unit 130, a power supply voltage corrector 140, a reference voltage input unit 150, and a reference voltage supply unit 160.
  • the power supply unit 110 includes a power supply 111 and a rectifier circuit 112.
  • the power supply unit 110 may further include a dimmer 113.
  • the power supply 111 is connected to an external AC power source (hereinafter referred to as an AC power supply) to receive the corresponding AC power, and the rectifier circuit 112 receives the AC power applied through the power supply 111. Rectify.
  • the dimmer 113 is connected in series to the connection line between the power supply 111 and the rectifier circuit 112 to receive an AC voltage from the power supply 111, and then applies an output voltage to the rectifier circuit 112.
  • any one kind of the conventional dimmers may be selected and used as the dimmer 113, and thus, detailed descriptions and illustrations thereof will be omitted in the present embodiment.
  • the LED lighting unit 120 includes a plurality of LEDs 120-1 to 120-n, that is, a first LED 120-1 located at a shortest distance from a connection point with the power supply unit 110 and such a first LED.
  • the nth LED 120-n positioned at the longest distance from the power supply unit 110 starts from 120-1.
  • the first LED 120-1 is electrically connected to the power supply unit 110, and all of the LEDs 120-1 to 120-n included in the first LED 120-1 and the lighting unit 120 are connected to each other. Are connected in series.
  • the switching circuit unit 130 is individually connected to an output terminal of each of the LEDs 120-1 to 120-n forming the LED lighting unit 120, and each of these switching circuit units 130 is a corresponding LED 120-1 to 120-n. To form a current supply channel for.
  • the power supply voltage correction unit 140 is connected in parallel to the connection line between the power supply unit 110 and the first LED (120-1) of the LED lighting unit 120, such a power supply voltage correction unit 140 is connected to the power supply unit 110 When the absolute value of the AC power input through the output of the adjustment signal of the current value supplied to the LED lighting unit 120.
  • the reference voltage value input unit 150 detects all the reference voltage values in the LED lighting driving circuit 100 and inputs them to the power supply voltage corrector 140. That is, the entire reference voltage value in the LED lighting driving circuit 100 is input to the power supply voltage corrector 140 through the reference voltage value input unit 150.
  • the reference voltage supply unit 160 individually applies the reference voltages REF1 to REFn with respect to the switching circuit units 130 based on the signal input through the power supply voltage corrector 140.
  • the output value of the power supply voltage correction unit 140 is provided to the reference voltage supply unit 160 generating the reference current or the reference voltage of the switching circuit unit 130, and thus all the switching circuit units 130 The supply current of the current value is controlled in conjunction with the output value of the power supply voltage correction unit 140.
  • FIG. 5 is a circuit diagram conceptually showing another example of an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes according to the present invention.
  • the power supply voltage correcting unit 140 includes a power supply unit 111. ) Is connected in parallel to the connection line between the rectifier circuit 112 and receiving the AC power of the power supply unit 110 as an input signal.
  • the connection line of the power supply voltage corrector 140 connected in parallel to the connection line between the power supply 111 and the rectifier circuit 112 is provided with a pair of resistors connected in series to supply power voltage between the pair of resistors.
  • the connection line to the government 140 may be branched.
  • the same reference numerals are used for the same components as in FIG. 4.
  • an LED lighting driving circuit 100 (hereinafter referred to as an “LED lighting driving circuit”) having a light quantity compensation function when a power supply voltage is changed according to an embodiment of the present invention will be described with reference to FIG. 6.
  • the LED lighting driving circuit 100 according to the present embodiment is similar in overall configuration to the LED lighting driving circuit described in FIG. 4, and therefore, the same reference numerals are used for the same components as those of FIG. Omit the description.
  • the LED lighting driving circuit 100 is the power supply unit 110, LED lighting unit 120, switching circuit unit 130, power supply voltage correction unit 140, reference voltage value input unit 150, the reference voltage supply unit 160 is configured.
  • the power supply unit 110 and the LED lighting unit 120 have the same configuration as the LED lighting driving circuit according to FIG. 4, the description thereof will be omitted.
  • the switching circuit unit 130 is individually connected to the output terminals of the LEDs 121 to 124 forming the LED lighting unit 120, that is, the switching circuit unit 130 has a plurality of configurations equal to the number of LEDs.
  • the common ground resistor 133 to which the plurality of switching circuit units 130 are commonly grounded is further included in the LED lighting driving circuit 100.
  • the switching circuit unit 130 includes a switching element 131 and a comparator 132.
  • the switching element 131 is connected to a common ground resistor 133 while being connected to the LED output terminal of the LED driver 120.
  • the comparator 132 compares the reference voltage of the reference voltage supply unit 160 with the common voltage of the common ground resistor 133.
  • the switching element 130 may be any one of a first current path connected to the LEDs 121 to 124 of the LED driver 120 and a second current path connected to the common ground resistor 133 according to the output of the comparator 132. The switching operation to one side varies the common voltage of the common ground resistor 133.
  • the switching element 131 has a drain connected to the LED output terminal of the LED driver 120, a source connected to the common ground resistor 133, and a gate connected to the comparator 132. FET), but the present invention is not limited thereto.
  • the power supply voltage correction unit 140 includes an average voltage value calculation unit 141, an instantaneous voltage value detection unit 142, a calculation unit 143, and a reference voltage value correction unit 144.
  • the power supply voltage corrector 140 may further include a voltage adjuster 145.
  • the voltage adjusting unit 145 is installed in a connection line between any one or both of the average voltage value calculating unit 141 and the instantaneous voltage value detecting unit 142 and the power supply unit 110.
  • the voltage adjusting unit 145 lowers the AC power input through the power supply unit 110 to the driving voltage of the LED lighting driving circuit 100.
  • the voltage adjusting unit 145 is connected in series to the connection line between the power supply unit 110 and the average voltage value calculating unit 141, and the connection line between the voltage adjusting unit 145 and the average voltage value calculating unit 141 is connected.
  • the instantaneous voltage value detector 142 is connected in parallel, the present invention is not limited thereto.
  • the average voltage value calculator 141 calculates an average voltage value V PL by averaging the magnitude of the power supply voltage of the waveform reference input through the voltage adjuster 145.
  • the average voltage value calculation unit 141 calculates the average voltage value V PL by averaging the total magnitude of the input power supply voltage for one hour or more on a pulse waveform basis.
  • the instantaneous voltage value detector 142 detects a voltage level corresponding to the instantaneous voltage value V PS when the magnitude of the power supply voltage of the waveform reference input through the voltage adjuster 145 is changed instantaneously.
  • the calculating unit 143 receives the output voltage values of the average voltage value calculating unit 141 and the instantaneous voltage value detecting unit 142 and calculates a difference between the two voltage values V PL and V PS .
  • K (V PS -V PL ) which is a value multiplied by the gain K, is output to the reference voltage value correction unit 144.
  • the specific gain K corresponds to a compensation gain for adjusting the degree of correction of the voltage value (or current value).
  • the entire reference voltage value V REFO in the LED lighting driving circuit 100 is input from the reference voltage value input unit 150 to the reference voltage value correction unit 144.
  • the reference voltage supply unit 160 applies the reference voltages REF1 to REF4 to the switching circuit units 130 based on the signal input from the reference voltage value correction unit 144.
  • the average voltage value V PL of the average voltage value calculating unit 141 and the instantaneous voltage value of the instantaneous voltage value detecting unit 142 Since V PS is the same, the current value supplied to the switching circuit unit 130 follows the reference voltage V REFO of the entire LED lighting driving circuit 100, and when the power is shaken, the instantaneous voltage value V PS -average The current value for the switching circuit unit 130 is corrected according to the value of the voltage value V PL .
  • FIG. 7 is a circuit diagram conceptually showing another example of an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes according to an embodiment of the present invention.
  • the voltage adjusting unit 145 is connected in parallel to the connection line between the power supply 111 and the rectifier circuit 112 to receive the AC power of the power supply 110 as an input signal.
  • the connection line of the voltage adjusting unit 145 connected in parallel to the connection line between the power supply 111 and the rectifier circuit 112 is provided with a pair of resistors connected in series to the voltage adjusting unit 145 between the pair of resistors.
  • the connection line for may be branched.
  • the LED lighting driving circuit having the light amount compensation function when the power supply voltage changes in FIG. 7 is the same as in FIG. 6, but only the circuit configurations of FIG. 6 are blocked. Therefore, detailed description of the block configurations of FIG. 7 will be omitted.
  • FIG. 8 is a diagram illustrating a change in current waveform according to a power change in an LED lighting driving circuit having a light amount compensation function when a power supply voltage is changed according to embodiments of the present invention.
  • (B) corresponds to the presence of a dimmer.
  • the current waveforms have a wide width L 1 and L 2 while the size is reduced by H 1 (or H 2 ). That is, when the power supply voltage suddenly increases, the current amount of the current source is reduced instead of increasing the operating area of the maximum current driving current source, so that the amount of light of the LED lighting unit is kept similar.
  • the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes in accordance with the present invention, Even if the absolute value changes, the change of the final LED emission amount is minimized, and thus the LED light can maintain and display a stable lighting function without causing flickering or shaking of the light even in an unstable power state.

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Abstract

The LED light driver circuit having a radiation compensation function during a change in power supply voltage according to the present invention includes: a power unit having a power supply unit to which an external AC power source is supplied, and a rectifier circuit for the AC power source applied through the power supply unit; an LED lighting unit having n LEDs such that the first LED is positioned at the shortest distance from the point of connection with the power unit so as to be connected to the power unit, and the nth LED is positioned at the furthest distance from the power unit, wherein each of the n LEDs are connected in series; a plurality of switching circuit units individually connected to the output ends of the respective LEDs forming the LED lighting unit so as to form a current supply channel for the LEDs; a power supply voltage compensation unit which is connected in parallel to a connection line between the power unit and the first LED, and which outputs an adjustment signal for a current value supplied to the LED lighting unit when the absolute value of the AC power source inputted through the power unit changes; and a reference voltage supply unit which applies a reference voltage to each of the switching circuit units based on the signal that is inputted from the power supply voltage compensation unit.

Description

전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로LED lighting driving circuit having light compensation function when power supply voltage changes
본 발명은 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로에 관한 것으로서, 특히 교류 다이렉트 방식의 LED 조명 구동회로에서 교류 전원의 절대값 변화가 발생하더라도 최종 LED 발광량의 변화는 최소화되고 따라서 LED 조명이 불안정한 전원 상태에서도 빛의 깜박임이나 흔들림 현상 없이 안정적인 동작 상태를 유지할 수 있는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로에 관한 것이다.The present invention relates to an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes. In particular, even when an absolute value change of AC power occurs in an AC direct type LED lighting driving circuit, the change in the final LED emission amount is minimized and thus the LED The present invention relates to an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes to maintain a stable operating state without light flickering or shaking even in an unstable power supply state.
LED(Light Emitting Diode)는 전류 구동 소자로써, 정전류가 안정적으로 공급되어야 정상적으로 동작할 수 있다. 특히 고전력을 요구하는 LED는 구동 전류가 크기 때문에(보통 350㎃ 이상) LED 자체에서 많은 열이 발생되고, 따라서 휘도의 열화율이 저전력에서의 LED보다 크다. 이는 LED의 수명과 직접적으로 연결되며 조명 시장에서 매우 중요한 요소로 작용하게 된다.The LED (Light Emitting Diode) is a current driving device, and can operate normally when a constant current is stably supplied. In particular, LEDs that require high power generate a lot of heat in the LEDs themselves because of the large driving current (typically 350 mA or more), and thus the degradation rate of luminance is greater than that of LEDs at low power. This is directly linked to the lifetime of the LED and is very important in the lighting market.
초기 LED 조명의 경우 통상 SMPS(Switched mode power supply)의 buck type으로 구현되었고, 이후 절연 기능을 고려하여 변압기(transformer)를 이용한 플라이백(fly-back) 타입으로 구현되었으며, 상기 플라이백 타입이 개선되어 PSR(Primary side regulation) 방식의 플라이백(fly-back) 타입이 짧은 기간이지만 제안되어 개발되기도 하였다.Early LED lighting is usually implemented as a buck type of switched mode power supply (SMPS), and then implemented as a flyback type using a transformer in consideration of the insulation function, and the flyback type is improved. Therefore, the fly-back type of PSR (Primary side regulation) method is a short term, but it has been proposed and developed.
그리고 최근에는 대용량의 무효분(reactive component) 수를 획기적으로 줄인 교류 다이렉트 방식의 LED 조명 구동 방식이 제안 및 실시되고 있다.In recent years, an AC direct-type LED lighting driving method of drastically reducing the number of large-capacity reactive components has been proposed and implemented.
이와 같은 교류 다이렉트 방식의 LED 조명 구동 방식은 교류 전원이 직접 LED의 열에 인가되고, 시간상으로 변화하는 교류 전원의 전압값에 적합한 개수의 LED가 선택된 후, 선택된 LED만이 점등되도록 전류원을 평행 배치하여 제어하는 방식이다. 다시 말해, 기존의 SMPS(Switched mode power supply) 방식이라 분류될 수 있는 buck, fly-back, PSR fly-back은 기본적으로 교류 전원을 DC 전압으로 변환하여 LED를 구동하는 것이지만, 교류 다이렉트 방식의 LED 조명 구동 방식은 기본적으로 교류 전원이 직접 LED의 열에 인가된다.In the AC direct driving method, the AC power is directly applied to the heat of the LED, and the number of LEDs suitable for the voltage value of the AC power that changes in time is selected, and the current source is arranged in parallel so that only the selected LED is turned on. That's the way it is. In other words, buck, fly-back, and PSR fly-back, which can be classified as a conventional switched mode power supply (SMPS) method, basically drive an LED by converting an AC power into a DC voltage, but using an AC direct LED In the lighting driving method, AC power is basically applied directly to the heat of the LED.
도 1은 종래 교류 다이렉트 방식의 LED 조명 구동회로를 개념적으로 보인 것으로서, 디머(dimmer)가 없는 경우를 예로 한 것이며, AC전원(10), 정파정류기(20), 다수의 LED(31~34) 및 이러한 LED(31~34)의 수에 대응되는 전류원(41~44), 그리고 회로 전체의 제어를 위한 알고리즘 회로로 구성된다.1 is a conceptual view of an LED lighting driving circuit of a conventional AC direct method, which is an example in which there is no dimmer, and includes an AC power supply 10, a rectifier rectifier 20, and a plurality of LEDs 31 to 34. And current sources 41 to 44 corresponding to the number of LEDs 31 to 34, and an algorithm circuit for controlling the entire circuit.
또한 도 2는 디머(dimmer)가 있는 종래 교류 다이렉트 방식의 LED 조명 구동회로를 개념적으로 보인 것으로서, 도 1과 마찬가지로 AC전원(10), 정파정류기(20), 다수의 LED(31~34) 및 이러한 LED(31~34)의 수에 대응되는 전류원(41~44), 그리고 회로 전체의 제어를 위한 알고리즘 회로를 포함하는 동시에 디머(50) 및 이러한 디머(50)의 안정적인 구동을 위한 블리딩(bleeding) 전류원(60)을 추가로 포함하는 구성이다.In addition, FIG. 2 conceptually shows a conventional AC direct type LED lighting driving circuit having a dimmer, and similarly to FIG. 1, an AC power source 10, a wave rectifier 20, a plurality of LEDs 31 to 34, and A current source 41 to 44 corresponding to the number of LEDs 31 to 34, and an algorithm circuit for controlling the entire circuit, and at the same time, bleeding for stable driving of the dimmer 50 and the dimmer 50. ) Further includes a current source 60.
이와 같은 도 1 및 도 2에 따른 교류 다이렉트 방식의 LED 조명 구동회로는 상술한 기존 SMPS 방식의 LED 구동회로와 비교할 때, 큰 값의 인덕터(inductor) 또는 변압기(transformer)를 필요로 하지 않는 점, 큰 값의 전해 콘덴서를 필요로 하지 않는 점, 상대적으로 제어 알고리즘이 간단한 점 등 여러 이점이 있으며, 결론적으로 부품 수와 제조 공정 및 모듈 크기에서 우위에 있다.1 and 2, the AC direct type LED lighting driving circuit according to the present invention does not require a large value inductor or transformer when compared with the aforementioned SMPS type LED driving circuit. There are many advantages, such as not requiring large value electrolytic capacitors and relatively simple control algorithms, which in turn have an advantage in component count, manufacturing process and module size.
그러나 도 1 및 도 2에 따른 교류 다이렉트 방식의 LED 조명 구동회로는 상기와 같은 이점이 있는 반면에, AC전압의 크기가 순간적으로 변할 경우 LED의 밝기 역시 순간 반응하고, 또한 AC전압의 크기가 주기적으로 변할 경우 LED의 밝기 역시 주기적으로 반응하며, 이는 사용자의 눈에 LED 조명의 깜박임과 흔들림의 불량 동작으로 보이게 된다.However, while the AC direct type LED lighting driving circuit according to FIGS. 1 and 2 has the above advantages, when the magnitude of the AC voltage changes momentarily, the brightness of the LED also reacts instantaneously, and the magnitude of the AC voltage is periodic. The brightness of the LED also reacts periodically when it changes to, which is seen as a bad behavior of flickering and shaking of the LED lights in the eyes of the user.
다시 말해, 기존 SMPS 방식의 LED 조명 구동회로도 설계하기에 따라서는 실제 동작 환경에서 불안정한 교류 전압으로 인해 LED 밝기에 변화가 발생할 수 있지만, 기본적으로 SMPS 방식의 LED 조명 구동회로는 교류를 DC로 바꿔주는 역할을 하는바, 교류 전원이 불안정한 동작을 하더라도 그 영향이 감소된 형태로 동작하는 구조적인 장점을 가짐은 분명하다.In other words, according to the design of the existing SMPS type LED lighting driving circuit, the unstable AC voltage may change the LED brightness in the actual operating environment, but the SMPS type LED lighting driving circuit basically changes the AC to DC. It plays a role, and it is clear that the AC power supply has a structural advantage of operating in a reduced form even if the AC power is unstable.
이에 비하여 종래 교류 다이렉트 방식의 LED 조명 구동회로는 기본적으로 전원 전압 발생 시 LED를 적절히 점등하는 시스템으로써, 이에 따라 종래 교류 다이렉트 방식의 LED 조명 구동회로는 교류 전압의 절대값(magnitude)이 변하면 각 전류원이 점멸하는 구간 역시도 그에 맞춰 변하는 동작을 한다.On the other hand, the conventional AC direct type LED lighting driving circuit is basically a system that lights up the LED properly when a power supply voltage is generated. Accordingly, the conventional AC direct type LED lighting driving circuit changes each current source when the absolute value of the AC voltage changes. This flashing section also changes accordingly.
도 3의 (a)(b)를 참조하면, (a)는 종래 교류 다이렉트 방식의 LED 조명 구동회로(디머가 없는 경우)에서 전원 변화에 따른 전류 파형의 변화를 보인 것이고, (b)는 종래 교류 다이렉트 방식의 LED 조명 구동회로(디머가 없는 경우)에서 전원 변화에 따른 전류 파형의 변화를 보인 것이다.Referring to (a) and (b) of FIG. 3, (a) shows a change in current waveform according to a change in power in a conventional LED lighting driving circuit (when there is no dimmer) of an AC direct type, and (b) shows a conventional In the AC direct type LED lighting driving circuit (when there is no dimmer), the current waveform is changed according to the power change.
도시된 바와 같이, 교류 다이렉트 방식의 LED 조명 구동회로에서 AC전압이 1회성으로 변할 경우, 최대 전류를 구동하는 전류원의 그 동작 영역의 폭(L1,L2)이 넓어짐을 확인할 수 있으며, 이러한 현상은 디머의 존재 여부에 상관없이 발생한다.As shown, when the AC voltage is changed once in the LED lighting driving circuit of the AC direct type, it can be seen that the width (L 1 , L 2 ) of the operating region of the current source that drives the maximum current becomes wider. The phenomenon occurs regardless of the presence of dimmers.
이는 교류 다이렉트 방식의 LED 조명 구동회로에서 전류원들을 순차적으로 제어하는 내부 기준 전압은 고정된 반면, 외부에서 들어오는 전원이 동일한 주파수에서 크기만 변함에 따라, 전류원의 점멸 시간에 변동이 발생하는 것에서 비롯된다.This is because the internal reference voltage that sequentially controls the current sources in the AC direct-type LED lighting driving circuit is fixed, but the variation occurs in the blinking time of the current source as the incoming power changes only in magnitude at the same frequency.
그리고 이와 같은 현상은 사용자가 LED 조명의 빛 상태를 깜박임 및 흔들림의 불량 상태로 인식하는 주원인이 되는바, 이의 해결은 교류 다이렉트 방식의 LED 조명 구동회로를 기능 개선하는데 매우 중요한 부분이라 할 수 있다.And this phenomenon is the main reason that the user recognizes the light state of the LED light as a bad state of flickering and shaking, the solution of this may be a very important part to improve the function of the LED direct drive circuit of the AC direct method.
본 발명은 교류 다이렉트 방식의 LED 조명 구동회로에서 교류 전원의 절대값 변화가 발생하더라도 최종 LED 발광량의 변화는 최소화되고 이에 따라 LED 조명은 불안정한 전원 상태에서도 그 빛의 깜박임이나 흔들림 현상을 발생하지 않고 안정적인 조명 기능을 유지 및 발휘하게 되는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 제공하는데 목적이 있다.According to the present invention, even if the absolute value change of the AC power is generated in the AC direct type LED lighting driving circuit, the change of the final LED light emission is minimized and accordingly, the LED light is stable without generating flickering or shaking of the light even in an unstable power state. It is an object of the present invention to provide an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes to maintain and display a lighting function.
상기와 같은 목적을 달성하기 위해 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로는, 외부의 교류전원이 공급되는 전원공급부 및 상기 전원공급부를 통해 인가되는 교류전원의 정류회로를 포함하는 전원부와, 상기 전원부와의 접속점으로부터 최단 거리에 위치한 제1 LED를 시작으로 전원부에서 최장 거리에 위치한 제n LED를 포함하여 상기 제1 LED가 상기 전원부에 접속되는 동시에 각각의 LED가 직렬 연결되는 LED 조명부와, 상기 LED 조명부를 형성하는 각 LED의 출력단에 개별 접속되어 해당 LED에 대한 전류공급채널을 형성하는 복수의 스위칭 회로부와, 상기 전원부 및 제1 LED 간의 접속라인에 병렬 접속되어 상기 전원부를 통해 입력되는 교류전원의 절대값 변화 시 상기 LED 조명부에 공급되는 전류 값의 조정신호를 출력하는 전원전압 보정부와, 상기 전원전압 보정부로부터 입력되는 신호를 기준으로 상기 스위칭 회로부 각각에 기준 전압을 인가하는 기준전압 공급부를 포함하여 구성된다.In order to achieve the above object, the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes according to the present invention includes a power supply unit to which an external AC power is supplied and a rectifying circuit of AC power applied through the power supply unit. And a power supply unit including an nth LED located at a longest distance from the power supply unit, starting with a first LED located at the shortest distance from the connection point with the power supply unit, and the first LEDs being connected to the power supply unit, and each LED being in series. A plurality of switching circuit units connected to an LED lighting unit connected to each other, an output terminal of each LED forming the LED lighting unit to form a current supply channel for the corresponding LED, and connected in parallel to a connection line between the power supply unit and the first LED; Outputs an adjustment signal of the current value supplied to the LED lighting unit when the absolute value of the AC power input through the power supply unit changes And a reference voltage supply unit configured to apply a reference voltage to each of the switching circuit units based on a signal input from the power supply voltage correction unit.
또한, 상기 전원부는 상기 전원공급부에 접속되어 교류전압을 인가받고 상기 정류회로에 출력전압을 인가하는 디머를 더 포함하는 것을 특징으로 한다.The power supply unit may further include a dimmer connected to the power supply unit to receive an AC voltage and to apply an output voltage to the rectifier circuit.
또한, 상기 전원전압 보정부는 상기 전원부 및 상기 제1 LED 간의 접속라인에 병렬 접속되는 평균전압값 산출부와, 상기 전원부 및 상기 제1 LED 간의 접속라인에 병렬 접속되는 순간전압값 검출부와, 상기 평균전압값 산출부 및 순간전압값 검출부의 출력 전압 값을 입력받아 두 전압 값의 차이를 연산 후 해당 값에 특정 이득을 곱한 값을 출력하는 연산부와, 상기 연산부의 출력 전압값을 엘이디 조명 구동회로 내의 전체 기준전압값으로부터 뺄셈하여 기준전압값의 보정 값을 산출 후 이를 상기 기준전압 공급부에 입력하는 기준전압값 보정부를 포함하는 것을 특징으로 한다.The power supply voltage corrector may include an average voltage value calculator connected in parallel with a connection line between the power supply unit and the first LED, an instantaneous voltage value detector connected in parallel with a connection line between the power supply unit and the first LED, and the average value. An operation unit that receives the output voltage values of the voltage value calculation unit and the instantaneous voltage value detection unit, calculates a difference between the two voltage values, and outputs a value obtained by multiplying the corresponding gain by a specific gain; And a reference voltage value correction unit which calculates a correction value of the reference voltage value by subtracting the entire reference voltage value and inputs the correction value to the reference voltage supply unit.
또한, 상기 전원전압 보정부는 상기 평균전압값 산출부 및 순간전압값 검출부 중 어느 하나 또는 둘 모두와 상기 전원부 간의 접속라인에 설치되어 상기 전원부를 통해 입력되는 교류전원을 엘이디 조명 구동회로의 구동 전압으로 낮추는 전압조정부를 더 포함하는 것을 특징으로 한다.The power supply voltage correction unit may be installed in a connection line between any one or both of the average voltage value calculation unit and the instantaneous voltage value detection unit and the power supply unit to convert AC power inputted through the power supply unit into the driving voltage of the LED lighting driving circuit. It characterized in that it further comprises a voltage regulator for lowering.
또한, 상기 전압조정부는 상기 전원부 및 평균전압값 산출부 간의 접속라인에 직렬 접속되며, 상기 순간전압값 검출부는 상기 전압조정부와 평균전압값 산출부 간의 접속라인에 병렬 접속되는 것을 특징으로 한다.The voltage adjusting unit may be connected in series to a connection line between the power supply unit and the average voltage value calculating unit, and the instantaneous voltage value detecting unit may be connected in parallel to the connection line between the voltage adjusting unit and the average voltage value calculating unit.
또한, 상기 평균전압값 산출부는 상기 전압조정부를 통해 입력되는 파형 기준의 전원전압 크기를 평균화하여 평균전압값을 산출하는 것을 특징으로 한다.The average voltage value calculating unit may calculate an average voltage value by averaging the magnitude of the power supply voltage of the waveform reference inputted through the voltage adjusting unit.
또한, 상기 평균전압값 산출부는 1시간 이상 지속해서 입력된 전원전압의 전체 크기를 펄스 파형 기준으로 평균화하여 평균전압값을 산출하는 것을 특징으로 한다.The average voltage value calculating unit may calculate the average voltage value by averaging the total magnitude of the input power voltage for one hour or more on a pulse waveform basis.
또한, 상기 전압조정부는 상기 정류회로와 제1 LED 간의 접속라인에 병렬 접속되어 상기 전원부의 교류전원을 입력신호로써 입력받거나 또는 상기 전원공급부와 정류회로 간의 접속라인에 병렬 접속되어 상기 전원부의 교류전원을 입력신호로써 입력받는 것을 특징으로 한다.The voltage adjusting unit may be connected in parallel to a connection line between the rectifier circuit and the first LED to receive AC power of the power supply unit as an input signal or to be connected in parallel to a connection line between the power supply unit and the rectifier circuit. Characterized in that it is input as an input signal.
또한, 상기 전원공급부 및 정류회로 간의 접속라인에 병렬 접속되는 상기 전압조정부의 접속라인에는 직렬 연결되는 한 쌍의 저항이 구비되어 상기 한 쌍의 저항 사이에서 상기 전압조정부에 대한 접속라인이 분기되는 것을 특징으로 한다.In addition, the connection line of the voltage adjuster connected in parallel to the connection line between the power supply and the rectifier circuit is provided with a pair of resistors connected in series to branch the connection line to the voltage adjuster between the pair of resistors. It features.
또한, 상기 순간전압값 검출부는 상기 전압조정부를 통해 입력되는 파형 기준의 전원전압 크기가 순간 변화할 때 해당 파형의 전압크기를 순간전압값으로 검출하는 것을 특징으로 한다.The instantaneous voltage value detector may detect the voltage level of the waveform as the instantaneous voltage value when the magnitude of the power supply voltage of the waveform reference inputted through the voltage adjuster changes instantaneously.
또한, 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로는, 상기 스위칭 회로부들이 공통적으로 접지되는 공통 접지 저항을 더 포함하며, 상기 스위칭 회로부는 상기 LED 구동부의 LED 출력단에 접속되는 동시에 상기 공통 접지 저항에 접속되는 스위칭 소자 및 상기 LED 구동부의 LED에 대한 상기 기준전압 공급부의 기준전압과 상기 공통 접지 저항의 공통전압을 비교하는 비교기를 포함하고 상기 스위칭 소자는 상기 비교기의 출력에 따라 상기 LED 구동부의 LED에 접속되는 제1 전류경로 및 상기 공통 접지 저항에 접속되는 제2 전류경로 중 어느 한 쪽으로 스위칭 동작하여 상기 공통 접지 저항의 공통전압을 가변하는 것을 특징으로 한다.In addition, the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes in accordance with the present invention further includes a common ground resistance to which the switching circuit parts are commonly grounded, wherein the switching circuit part is connected to the LED output terminal of the LED driving part. And a comparator for comparing the reference voltage of the reference voltage supply unit and the common voltage of the common ground resistor to a switching element connected to the common ground resistor and a common voltage of the common ground resistor. Accordingly, the common voltage of the common ground resistor may be varied by switching to any one of a first current path connected to the LED of the LED driver and a second current path connected to the common ground resistor.
또한, 상기 스위칭 소자는 상기 LED 구동부의 LED 출력단에 드레인이 접속되고 상기 공통 접지 저항에 소스가 접속되며 상기 비교기에 게이트가 접속되는 전계효과 트랜지스터(MOS FET)인 것을 특징으로 한다.The switching element may be a field effect transistor (MOS FET) having a drain connected to an LED output terminal of the LED driver, a source connected to the common ground resistor, and a gate connected to the comparator.
본 발명에 따르면, 교류 다이렉트 방식의 LED 조명 구동회로에서 교류 전원의 절대값 변화가 발생하더라도 최종 LED 발광량의 변화는 최소화되고 이에 따라 LED 조명은 불안정한 전원 상태에서도 그 빛의 깜박임이나 흔들림 현상을 발생하지 않고 안정적인 조명 기능을 유지 및 발휘할 수 있다.According to the present invention, even if the absolute value change of the AC power in the AC direct type LED lighting driving circuit occurs, the change of the final LED emission amount is minimized and accordingly, the LED lighting does not cause flickering or shaking of the light even in an unstable power state. It can maintain and exert stable lighting function.
도 1은 종래 교류 다이렉트 방식 LED 구동회로의 디머가 없는 형태를 개념적으로 예시한 회로도1 is a circuit diagram conceptually illustrating a form without a dimmer of a conventional AC direct type LED driving circuit.
도 2는 종래 교류 다이렉트 방식 LED 구동회로의 디머가 있는 형태를 개념적으로 예시한 회로도2 is a circuit diagram conceptually illustrating a form having a dimmer of a conventional AC direct type LED driving circuit.
도 3은 종래 교류 다이렉트 방식 LED 구동회로에서 전원 변화에 따른 전류 파형의 변화를 예시한 도면3 is a view illustrating a change in current waveform according to a power supply change in a conventional AC direct type LED driving circuit;
도 4는 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 개념적으로 보인 회로도4 is a circuit diagram conceptually showing an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes according to the present invention.
도 5는 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로의 다른 예를 개념적으로 보인 회로도5 is a circuit diagram conceptually showing another example of an LED lighting driving circuit having a light quantity compensation function when a power supply voltage is changed according to the present invention.
도 6은 본 발명의 일 실시예에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 보인 회로도6 is a circuit diagram illustrating an LED lighting driving circuit having a light amount compensation function when a power supply voltage is changed according to an exemplary embodiment of the present invention.
도 7은 본 발명의 다른 실시예에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 보인 회로도7 is a circuit diagram illustrating an LED lighting driving circuit having a light amount compensation function when a power supply voltage is changed according to another embodiment of the present invention.
도 8은 본 발명의 실시예들에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로에서 전원 변화에 따른 전류 파형의 변화를 예시한 도면8 is a diagram illustrating a change in current waveform according to a power supply change in an LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes according to embodiments of the present invention.
이하에서는, 첨부된 도면을 참조하여 본 발명의 일 실시예에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail an LED lighting driving circuit having a light amount compensation function when the power supply voltage changes according to an embodiment of the present invention.
도 4는 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 개념적으로 보인 회로도이다.4 is a circuit diagram conceptually illustrating an LED lighting driving circuit having a light quantity compensation function when a power supply voltage is changed according to the present invention.
도시된 바와 같이, 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로(100 : 이하 “엘이디 조명 구동회로”라 함)는 전원부(110), LED 조명부(120), 스위칭 회로부(130), 전원전압 보정부(140), 기준전압값 입력부(150), 기준전압 공급부(160)를 포함하여 구성된다.As shown, the LED lighting driving circuit 100 (hereinafter referred to as "LED lighting driving circuit") having a light quantity compensation function when the power supply voltage changes in accordance with the present invention is a power supply unit 110, LED lighting unit 120, switching circuit unit 130, a power supply voltage corrector 140, a reference voltage input unit 150, and a reference voltage supply unit 160.
전원부(110)는 전원공급부(111) 및 정류회로(112)를 포함하여 구성된다. 또한 전원부(110)는 디머(113)를 더 포함하여 구성될 수 있다. 전원공급부(111)는 외부의 교류전원(AC전원, 이하 ‘교류전원’이라 함)과 접속되어 해당 교류전원을 공급받으며, 정류회로(112)는 전원공급부(111)를 통해 인가되는 교류전원을 정류한다. 그리고 디머(113)는 전원공급부(111)와 정류회로(112) 간 접속라인에 직렬 접속되어 전원공급부(111)로부터 교류전압을 인가받은 후 정류회로(112)에 출력전압을 인가한다. 여기서 디머(113)는 통상의 디머 중 어느 한 종류가 선택되어 사용될 수 있으며, 따라서 본 실시예에서 이에 대한 구체적인 설명 및 도시는 생략한다.The power supply unit 110 includes a power supply 111 and a rectifier circuit 112. In addition, the power supply unit 110 may further include a dimmer 113. The power supply 111 is connected to an external AC power source (hereinafter referred to as an AC power supply) to receive the corresponding AC power, and the rectifier circuit 112 receives the AC power applied through the power supply 111. Rectify. The dimmer 113 is connected in series to the connection line between the power supply 111 and the rectifier circuit 112 to receive an AC voltage from the power supply 111, and then applies an output voltage to the rectifier circuit 112. Herein, any one kind of the conventional dimmers may be selected and used as the dimmer 113, and thus, detailed descriptions and illustrations thereof will be omitted in the present embodiment.
LED 조명부(120)는 복수의 LED(120-1~120-n)를 포함하여 형성되는 것으로서, 즉 전원부(110)와의 접속점으로부터 최단 거리에 위치한 제1 LED(120-1) 및 이러한 제1 LED(120-1)를 시작으로 전원부(110)로부터 최장 거리에 위치한 제n LED(120-n)를 포함하여 구성된다. 그리고 제1 LED(120-1)는 전원부(110)에 전기적으로 접속되며, 이러한 제1 LED(120-1) 및 조명부(120)에 포함되는 모든 LED(120-1~120-n)는 서로 직렬 연결된다.The LED lighting unit 120 includes a plurality of LEDs 120-1 to 120-n, that is, a first LED 120-1 located at a shortest distance from a connection point with the power supply unit 110 and such a first LED. The nth LED 120-n positioned at the longest distance from the power supply unit 110 starts from 120-1. In addition, the first LED 120-1 is electrically connected to the power supply unit 110, and all of the LEDs 120-1 to 120-n included in the first LED 120-1 and the lighting unit 120 are connected to each other. Are connected in series.
스위칭 회로부(130)는 LED 조명부(120)를 형성하는 각 LED(120-1~120-n)의 출력단에 개별 접속되며, 이러한 스위칭 회로부(130) 각각은 해당 LED(120-1~120-n)에 대한 전류공급채널을 형성한다.The switching circuit unit 130 is individually connected to an output terminal of each of the LEDs 120-1 to 120-n forming the LED lighting unit 120, and each of these switching circuit units 130 is a corresponding LED 120-1 to 120-n. To form a current supply channel for.
전원전압 보정부(140)는 전원부(110) 및 LED 조명부(120)의 제1 LED(120-1) 간 접속라인에 병렬 접속되며, 이와 같은 전원전압 보정부(140)는 전원부(110)를 통해 입력되는 교류전원의 절대값 변화 시 LED 조명부(120)에 공급되는 전류 값의 조정신호를 출력한다.The power supply voltage correction unit 140 is connected in parallel to the connection line between the power supply unit 110 and the first LED (120-1) of the LED lighting unit 120, such a power supply voltage correction unit 140 is connected to the power supply unit 110 When the absolute value of the AC power input through the output of the adjustment signal of the current value supplied to the LED lighting unit 120.
기준전압값 입력부(150)는 엘이디 조명 구동회로(100) 내의 전체 기준전압값을 검출하여 전원전압 보정부(140)에 입력한다. 즉 기준전압값 입력부(150)를 통해 엘이디 조명 구동회로(100) 내의 전체 기준전압값이 전원전압 보정부(140)에 입력된다.The reference voltage value input unit 150 detects all the reference voltage values in the LED lighting driving circuit 100 and inputs them to the power supply voltage corrector 140. That is, the entire reference voltage value in the LED lighting driving circuit 100 is input to the power supply voltage corrector 140 through the reference voltage value input unit 150.
기준전압 공급부(160)는 전원전압 보정부(140)를 통해 입력되는 신호를 기준으로 스위칭 회로부(130)들에 대한 기준 전압(REF1~REFn)을 개별 인가한다.The reference voltage supply unit 160 individually applies the reference voltages REF1 to REFn with respect to the switching circuit units 130 based on the signal input through the power supply voltage corrector 140.
상기와 같은 구성에 의해서, 전원전압 보정부(140)의 출력 값은 스위칭 회로부(130)의 기준 전류 혹은 기준 전압을 생성하는 기준전압 공급부(160)에 제공되며, 이에 따라 모든 스위칭 회로부(130)의 공급전류는 전원전압 보정부(140)의 출력 값에 연동하여 그 전류값이 제어된다.By the above configuration, the output value of the power supply voltage correction unit 140 is provided to the reference voltage supply unit 160 generating the reference current or the reference voltage of the switching circuit unit 130, and thus all the switching circuit units 130 The supply current of the current value is controlled in conjunction with the output value of the power supply voltage correction unit 140.
한편, 도 5는 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로의 다른 예를 개념적으로 보인 회로도로서, 도시된 바와 같이, 전원전압 보정부(140)가 전원공급부(111)와 정류회로(112) 간의 접속라인에 병렬 접속되어 전원부(110)의 교류전원을 입력신호로써 입력받는 형태를 나타낸 것이다. 여기서 전원공급부(111) 및 정류회로(112) 간 접속라인에 병렬 접속되는 전원전압 보정부(140)의 접속라인에는 직렬 연결되는 한 쌍의 저항이 구비되어 이러한 한 쌍의 저항 사이에서 전원전압 보정부(140)에 대한 접속라인이 분기되는 것일 수 있다. 그리고 이와 같은 도 5에서 도 4와 동일한 구성 요소에 대해서는 동일한 부호를 사용하였다.Meanwhile, FIG. 5 is a circuit diagram conceptually showing another example of an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes according to the present invention. As illustrated, the power supply voltage correcting unit 140 includes a power supply unit 111. ) Is connected in parallel to the connection line between the rectifier circuit 112 and receiving the AC power of the power supply unit 110 as an input signal. Here, the connection line of the power supply voltage corrector 140 connected in parallel to the connection line between the power supply 111 and the rectifier circuit 112 is provided with a pair of resistors connected in series to supply power voltage between the pair of resistors. The connection line to the government 140 may be branched. In FIG. 5, the same reference numerals are used for the same components as in FIG. 4.
다음은 도 6을 참조하여 본 발명의 일 실시예에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로(100 : 이하 “엘이디 조명 구동회로”라 함)에 대해 설명한다. 그리고 본 실시예에 따른 엘이디 조명 구동회로(100)는 도 4에서 설명한 엘이디 조명 구동회로와 전체적인 구성에서 유사하며, 따라서 도 4와 동일한 구성에 대해서는 동일 부호를 사용하는 동시에 일부 동일 구성에 대해서는 그 상세 설명을 생략한다.Next, an LED lighting driving circuit 100 (hereinafter referred to as an “LED lighting driving circuit”) having a light quantity compensation function when a power supply voltage is changed according to an embodiment of the present invention will be described with reference to FIG. 6. In addition, the LED lighting driving circuit 100 according to the present embodiment is similar in overall configuration to the LED lighting driving circuit described in FIG. 4, and therefore, the same reference numerals are used for the same components as those of FIG. Omit the description.
도시된 바와 같이, 본 발명의 일 실시예에 따른 엘이디 조명 구동회로(100)는 전원부(110), LED 조명부(120), 스위칭 회로부(130), 전원전압 보정부(140), 기준전압값 입력부(150), 기준전압 공급부(160)를 포함하여 구성된다.As shown, the LED lighting driving circuit 100 according to an embodiment of the present invention is the power supply unit 110, LED lighting unit 120, switching circuit unit 130, power supply voltage correction unit 140, reference voltage value input unit 150, the reference voltage supply unit 160 is configured.
전원부(110)와 LED 조명부(120)는 도 4에 따른 엘이디 조명 구동회로와 동일 구성이므로 여기서 그 설명은 생략한다.Since the power supply unit 110 and the LED lighting unit 120 have the same configuration as the LED lighting driving circuit according to FIG. 4, the description thereof will be omitted.
스위칭 회로부(130)는 LED 조명부(120)를 형성하는 각 LED(121~124)의 출력단에 개별 접속되는 것으로서, 다시 말해 스위칭 회로부(130)는 LED의 수와 동일한 복수의 구성이다.The switching circuit unit 130 is individually connected to the output terminals of the LEDs 121 to 124 forming the LED lighting unit 120, that is, the switching circuit unit 130 has a plurality of configurations equal to the number of LEDs.
여기서 복수의 스위칭 회로부(130)가 공통적으로 접지되는 공통 접지 저항(133)이 엘이디 조명 구동회로(100)에 더 포함된다.Here, the common ground resistor 133 to which the plurality of switching circuit units 130 are commonly grounded is further included in the LED lighting driving circuit 100.
그리고 스위칭 회로부(130)는 스위칭 소자(131)와 비교기(132)를 포함하는 것으로서, 스위칭 소자(131)는 LED 구동부(120)의 LED 출력단에 접속되는 동시에 공통 접지 저항(133)에 접속되며, 비교기(132)는 기준전압 공급부(160)의 기준전압과 공통 접지 저항(133)의 공통전압을 비교한다. 또한 스위칭 소자(130)는 비교기(132)의 출력에 따라 LED 구동부(120)의 LED(121~124)에 접속되는 제1 전류경로 및 공통 접지 저항(133)에 접속되는 제2 전류경로 중 어느 한 쪽으로 스위칭 동작하여 공통 접지 저항(133)의 공통전압을 가변한다. 본 실시예에서는 스위칭 소자(131)가 LED 구동부(120)의 LED 출력단에 드레인이 접속되고, 공통 접지 저항(133)에 소스가 접속되며, 비교기(132)에 게이트가 접속되는 전계효과 트랜지스터(MOS FET)인 것을 예로 하였으나, 본 발명이 이에 한정되는 것은 아니다.In addition, the switching circuit unit 130 includes a switching element 131 and a comparator 132. The switching element 131 is connected to a common ground resistor 133 while being connected to the LED output terminal of the LED driver 120. The comparator 132 compares the reference voltage of the reference voltage supply unit 160 with the common voltage of the common ground resistor 133. In addition, the switching element 130 may be any one of a first current path connected to the LEDs 121 to 124 of the LED driver 120 and a second current path connected to the common ground resistor 133 according to the output of the comparator 132. The switching operation to one side varies the common voltage of the common ground resistor 133. In this embodiment, the switching element 131 has a drain connected to the LED output terminal of the LED driver 120, a source connected to the common ground resistor 133, and a gate connected to the comparator 132. FET), but the present invention is not limited thereto.
전원전압 보정부(140)는 평균전압값 산출부(141), 순간전압값 검출부(142), 연산부(143), 기준전압값 보정부(144)를 포함하여 구성된다. 또한 전원전압 보정부(140)는 전압조정부(145)를 더 포함하여 구성될 수 있다.The power supply voltage correction unit 140 includes an average voltage value calculation unit 141, an instantaneous voltage value detection unit 142, a calculation unit 143, and a reference voltage value correction unit 144. In addition, the power supply voltage corrector 140 may further include a voltage adjuster 145.
먼저, 전압조정부(145)에 대해 설명하면, 전압조정부(145)는 평균전압값 산출부(141) 및 순간전압값 검출부(142) 중 어느 하나 또는 둘 모두와 전원부(110) 간의 접속라인에 설치되며, 이러한 전압조정부(145)는 전원부(110)를 통해 입력되는 교류전원을 엘이디 조명 구동회로(100)의 구동 전압으로 낮추는 기능을 한다. 그리고 본 실시예에서는 전압조정부(145)가 전원부(110) 및 평균전압값 산출부(141) 간의 접속라인에 직렬 접속되고, 이러한 전압조정부(145)와 평균전압값 산출부(141) 간의 접속라인에 순간전압값 검출부(142)가 병렬 접속되는 형태를 예로 하였으나, 본 발명이 이에 한정되는 것은 아니다.First, the voltage adjusting unit 145 will be described. The voltage adjusting unit 145 is installed in a connection line between any one or both of the average voltage value calculating unit 141 and the instantaneous voltage value detecting unit 142 and the power supply unit 110. The voltage adjusting unit 145 lowers the AC power input through the power supply unit 110 to the driving voltage of the LED lighting driving circuit 100. In this embodiment, the voltage adjusting unit 145 is connected in series to the connection line between the power supply unit 110 and the average voltage value calculating unit 141, and the connection line between the voltage adjusting unit 145 and the average voltage value calculating unit 141 is connected. Although the instantaneous voltage value detector 142 is connected in parallel, the present invention is not limited thereto.
평균전압값 산출부(141)는 전압조정부(145)를 통해 입력되는 파형 기준의 전원전압 크기를 평균화하여 평균전압값(VPL)을 산출한다. 본 실시예에서는 평균전압값 산출부(141)가 1시간 이상 지속해서 입력된 전원전압의 전체 크기를 펄스 파형 기준으로 평균화하여 평균전압값(VPL)을 산출하는 것을 예로 하였다. 부연 설명하면, The average voltage value calculator 141 calculates an average voltage value V PL by averaging the magnitude of the power supply voltage of the waveform reference input through the voltage adjuster 145. In the present embodiment, the average voltage value calculation unit 141 calculates the average voltage value V PL by averaging the total magnitude of the input power supply voltage for one hour or more on a pulse waveform basis. In detail,
순간전압값 검출부(142)는 전압조정부(145)를 통해 입력되는 파형 기준의 전원전압 크기가 순간적으로 변화될 때, 이에 해당되는 전압크기를 순간전압값(VPS)으로 검출한다.The instantaneous voltage value detector 142 detects a voltage level corresponding to the instantaneous voltage value V PS when the magnitude of the power supply voltage of the waveform reference input through the voltage adjuster 145 is changed instantaneously.
연산부(143)는 평균전압값 산출부(141) 및 순간전압값 검출부(142)의 출력 전압 값을 입력받아 두 전압 값(VPL,VPS)의 차이를 연산하며, 이렇게 연산된 값에 특정 이득(K)을 곱한 값인 K(VPS-VPL)을 기준전압값 보정부(144)에 출력한다. 여기서 상기 특정 이득(K)은 전압값(or 전류값)의 보정 정도를 조정하기 위한 보정 이득(compensation gain)에 해당한다.The calculating unit 143 receives the output voltage values of the average voltage value calculating unit 141 and the instantaneous voltage value detecting unit 142 and calculates a difference between the two voltage values V PL and V PS . K (V PS -V PL ), which is a value multiplied by the gain K, is output to the reference voltage value correction unit 144. The specific gain K corresponds to a compensation gain for adjusting the degree of correction of the voltage value (or current value).
기준전압값 보정부(144)는 연산부(143)의 출력 전압값을 엘이디 조명 구동회로(100) 내의 전체 기준전압값으로부터 뺄셈하여 기준전압값의 보정 값인 VCOMP_REF=VREFO-K(VPS-VPL)을 산출 후, 이렇게 산출된 기준전압값의 보정 값을 기준전압 공급부(160)에 입력한다. 여기서 엘이디 조명 구동회로(100) 내의 전체 기준전압값(VREFO)은 기준전압값 입력부(150)로부터 기준전압값 보정부(144)에 입력된다.The reference voltage value correction unit 144 subtracts the output voltage value of the calculation unit 143 from all the reference voltage values in the LED lighting driving circuit 100 to calculate the correction value of the reference voltage value V COMP_REF = V REFO -K (V PS- After calculating V PL ), the correction value of the reference voltage value thus calculated is input to the reference voltage supply unit 160. Here, the entire reference voltage value V REFO in the LED lighting driving circuit 100 is input from the reference voltage value input unit 150 to the reference voltage value correction unit 144.
그리고 기준전압 공급부(160)는 기준전압값 보정부(144)로부터 입력되는 신호를 기준으로 스위칭 회로부(130) 각각에 기준 전압(REF1~REF4)을 인가한다.The reference voltage supply unit 160 applies the reference voltages REF1 to REF4 to the switching circuit units 130 based on the signal input from the reference voltage value correction unit 144.
상기와 같은 구성에 의해서, 전압조정부(145)에 공급되는 전원이 흔들리지 않는 경우에는 평균전압값 산출부(141)의 평균전압값(VPL)과 순간전압값 검출부(142)의 순간전압값(VPS)는 동일하므로, 스위칭 회로부(130)에 공급되는 전류 값은 엘이디 조명 구동회로(100) 전체의 기준전압(VREFO)를 따르며, 전원이 흔들릴 경우에는 순간전압값(VPS)-평균전압값(VPL)의 값에 따라 스위칭 회로부(130)에 대한 전류 값이 보정된다.With the above configuration, when the power supplied to the voltage adjusting unit 145 is not shaken, the average voltage value V PL of the average voltage value calculating unit 141 and the instantaneous voltage value of the instantaneous voltage value detecting unit 142 ( Since V PS is the same, the current value supplied to the switching circuit unit 130 follows the reference voltage V REFO of the entire LED lighting driving circuit 100, and when the power is shaken, the instantaneous voltage value V PS -average The current value for the switching circuit unit 130 is corrected according to the value of the voltage value V PL .
한편, 도 7은 본 발명의 일 실시예에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로의 다른 예를 개념적으로 보인 회로도로서, 도시된 바와 같이, 전원전압 보정부(140)의 전압조정부(145)가 전원공급부(111)와 정류회로(112) 간의 접속라인에 병렬 접속되어 전원부(110)의 교류전원을 입력신호로써 입력받는 형태를 나타낸 것이다. 여기서 전원공급부(111) 및 정류회로(112) 간 접속라인에 병렬 접속되는 전압조정부(145)의 접속라인에는 직렬 연결되는 한 쌍의 저항이 구비되어 이러한 한 쌍의 저항 사이에서 전압조정부(145)에 대한 접속라인이 분기되는 것일 수 있다. Meanwhile, FIG. 7 is a circuit diagram conceptually showing another example of an LED lighting driving circuit having a light quantity compensation function when a power supply voltage changes according to an embodiment of the present invention. As shown in FIG. The voltage adjusting unit 145 is connected in parallel to the connection line between the power supply 111 and the rectifier circuit 112 to receive the AC power of the power supply 110 as an input signal. Here, the connection line of the voltage adjusting unit 145 connected in parallel to the connection line between the power supply 111 and the rectifier circuit 112 is provided with a pair of resistors connected in series to the voltage adjusting unit 145 between the pair of resistors. The connection line for may be branched.
그리고 이와 같은 도 7의 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로는 도 6과 전체적으로 동일하며 다만 도 6의 회로 구성들을 블록화하여 도시하였을 뿐이다. 따라서 도 7의 블록 구성들에 대한 상세 설명은 생략한다.The LED lighting driving circuit having the light amount compensation function when the power supply voltage changes in FIG. 7 is the same as in FIG. 6, but only the circuit configurations of FIG. 6 are blocked. Therefore, detailed description of the block configurations of FIG. 7 will be omitted.
도 8은 본 발명의 실시예들에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로에서 전원 변화에 따른 전류 파형의 변화를 예시한 도면으로서, (a)는 디머가 없는 경우에 해당되고 (b)는 디머가 있는 경우에 해당된다.FIG. 8 is a diagram illustrating a change in current waveform according to a power change in an LED lighting driving circuit having a light amount compensation function when a power supply voltage is changed according to embodiments of the present invention. (B) corresponds to the presence of a dimmer.
도시된 바와 같이, 전원의 급작스런 크기 변화 발생 시 전류 파형은 그 폭(L1, L2)이 넓어지는 반면 그 크기는 H1(or H2)만큼 작아지는 것을 확인할 수 있다. 즉, 전원 전압이 갑자기 증가하면, 최대 전류 구동 전류원의 동작영역이 늘어나는 대신 전류원의 전류크기는 줄어들게 됨으로써 LED 조명부의 광량은 비슷하게 유지된다.As shown, it can be seen that when the sudden change in size of the power supply occurs, the current waveforms have a wide width L 1 and L 2 while the size is reduced by H 1 (or H 2 ). That is, when the power supply voltage suddenly increases, the current amount of the current source is reduced instead of increasing the operating area of the maximum current driving current source, so that the amount of light of the LED lighting unit is kept similar.
또한 이를 통해 교류전원의 값이 갑자기 감소할 경우, 반대로 전류원의 전류 크기는 증가되어 LED 조명부의 광량이 비슷하게 유지되는 것을 쉽게 유추할 수 있다.In addition, when the value of the AC power supply suddenly decreases through this, it is easy to infer that the amount of current of the current source is increased to maintain the light quantity of the LED lighting unit similarly.
상술한 도 4 내지 도 8의 실시예를 통하여 알 수 있는 바와 같이, 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로는, 교류 다이렉트 방식의 LED 조명 구동회로에서 교류 전원의 절대값 변화가 발생하더라도 최종 LED 발광량의 변화는 최소화되고 이에 따라 LED 조명은 불안정한 전원 상태에서도 그 빛의 깜박임이나 흔들림 현상을 발생하지 않고 안정적인 조명 기능을 유지 및 발휘할 수 있다. As can be seen through the embodiment of Figs. 4 to 8 described above, the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes in accordance with the present invention, Even if the absolute value changes, the change of the final LED emission amount is minimized, and thus the LED light can maintain and display a stable lighting function without causing flickering or shaking of the light even in an unstable power state.
이상에서 설명한 것은 본 발명에 따른 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로를 실시하기 위한 하나의 실시 예에 불과한 것으로서, 본 발명은 상기한 실시 예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 바와 같이 본 발명의 요지를 벗어 남이 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 the LED lighting driving circuit having a light quantity compensation function when the power supply voltage changes according to the present invention, the present invention is not limited to the above embodiment, the following claims As claimed in the scope of the present invention, those skilled in the art to which the present invention pertains will have the technical spirit of the present invention to the extent that various modifications can be made without departing from the gist of the present invention.
다양한 종류의 조명장치에 광범위하게 사용될 수 있다.Widely used in various kinds of lighting devices.

Claims (12)

  1. 외부의 교류전원이 공급되는 전원공급부 및 상기 전원공급부를 통해 인가되는 교류전원의 정류회로를 포함하는 전원부;A power supply unit including a power supply unit to which an external AC power is supplied and a rectifying circuit of AC power applied through the power supply unit;
    상기 전원부와의 접속점으로부터 최단 거리에 위치한 제1 LED를 시작으로 전원부에서 최장 거리에 위치한 제n LED를 포함하여 상기 제1 LED가 상기 전원부에 접속되는 동시에 각각의 LED가 직렬 연결되는 LED 조명부;An LED lighting unit including a first LED located at a shortest distance from a connection point with the power supply unit and an nth LED located at a longest distance from the power supply unit such that the first LED is connected to the power supply unit and each LED is connected in series;
    상기 LED 조명부를 형성하는 각 LED의 출력단에 개별 접속되어 해당 LED에 대한 전류공급채널을 형성하는 복수의 스위칭 회로부;A plurality of switching circuit units connected to an output terminal of each LED forming the LED lighting unit to form a current supply channel for the corresponding LED;
    상기 전원부 및 제1 LED 간의 접속라인에 병렬 접속되어 상기 전원부를 통해 입력되는 교류전원의 절대값 변화 시 상기 LED 조명부에 공급되는 전류 값의 조정신호를 출력하는 전원전압 보정부;A power supply voltage correction unit connected in parallel to a connection line between the power supply unit and the first LED to output an adjustment signal of a current value supplied to the LED lighting unit when an absolute value of AC power inputted through the power supply unit is changed;
    상기 전원전압 보정부로부터 입력되는 신호를 기준으로 상기 스위칭 회로부 각각에 기준 전압을 인가하는 기준전압 공급부를 포함하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.And a reference voltage supply unit configured to apply a reference voltage to each of the switching circuit units based on a signal input from the power supply voltage corrector.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 전원부는, 상기 전원공급부에 접속되어 교류전압을 인가받고 상기 정류회로에 출력전압을 인가하는 디머를 더 포함하는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.And the power supply unit further includes a dimmer connected to the power supply unit to receive an AC voltage and to apply an output voltage to the rectifier circuit.
  3. 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2,
    상기 전원전압 보정부는The power voltage correction unit
    상기 전원부 및 상기 제1 LED 간의 접속라인에 병렬 접속되는 평균전압값 산출부;An average voltage value calculator connected in parallel with a connection line between the power supply unit and the first LED;
    상기 전원부 및 상기 제1 LED 간의 접속라인에 병렬 접속되는 순간전압값 검출부;An instantaneous voltage value detector connected in parallel with a connection line between the power supply unit and the first LED;
    상기 평균전압값 산출부 및 순간전압값 검출부의 출력 전압 값을 입력받아 두 전압 값의 차이를 연산 후 해당 값에 특정 이득을 곱한 값을 출력하는 연산부;A calculator which receives the output voltage values of the average voltage value calculator and the instantaneous voltage detector, calculates a difference between the two voltage values, and outputs a value obtained by multiplying a corresponding gain by a specific gain;
    상기 연산부의 출력 전압값을 엘이디 조명 구동회로 내의 전체 기준전압값으로부터 뺄셈하여 기준전압값의 보정 값을 산출 후 이를 상기 기준전압 공급부에 입력하는 기준전압값 보정부를 포함하는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.And a reference voltage value correction unit which calculates a correction value of the reference voltage value by subtracting the output voltage value of the operation unit from all the reference voltage values in the LED lighting driving circuit and inputs it to the reference voltage supply unit. LED lighting driving circuit having a light intensity compensation function.
  4. 제 3 항에 있어서,The method of claim 3, wherein
    상기 전원전압 보정부는, 상기 평균전압값 산출부 및 순간전압값 검출부 중 어느 하나 또는 둘 모두와 상기 전원부 간의 접속라인에 설치되어 상기 전원부를 통해 입력되는 교류전원을 엘이디 조명 구동회로의 구동 전압으로 낮추는 전압조정부를 더 포함하는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The power supply voltage correction unit is installed in a connection line between any one or both of the average voltage value calculation unit and the instantaneous voltage value detection unit and the power supply unit to lower the AC power input through the power supply unit to the driving voltage of the LED lighting driving circuit. LED lighting driving circuit having a light amount compensation function when the power supply voltage changes, further comprising a voltage adjusting unit.
  5. 제 4 항에 있어서,The method of claim 4, wherein
    상기 전압조정부는 상기 전원부 및 평균전압값 산출부 간의 접속라인에 직렬 접속되며, 상기 순간전압값 검출부는 상기 전압조정부와 평균전압값 산출부 간의 접속라인에 병렬 접속되는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The voltage adjusting unit is connected in series with a connection line between the power supply unit and the average voltage value calculating unit, and the instantaneous voltage value detecting unit is connected in parallel with a connection line between the voltage adjusting unit and the average voltage value calculating unit. LED lighting driving circuit having a light amount compensation function of.
  6. 제 5 항에 있어서,The method of claim 5,
    상기 평균전압값 산출부는 상기 전압조정부를 통해 입력되는 파형 기준의 전원전압 크기를 평균화하여 평균전압값을 산출하는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.And the average voltage value calculating unit calculates an average voltage value by averaging the magnitude of the power supply voltage of the waveform reference inputted through the voltage adjusting unit.
  7. 제 6 항에 있어서,The method of claim 6,
    상기 평균전압값 산출부는 1시간 이상 지속해서 입력된 전원전압의 전체 크기를 펄스 파형 기준으로 평균화하여 평균전압값을 산출하는 것을 특징으로 하는 전원전압 변화시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.And the average voltage value calculating unit calculates an average voltage value by averaging the entire magnitude of the input power voltage on a pulse waveform basis for 1 hour or more.
  8. 제 5 항에 있어서,The method of claim 5,
    상기 전압조정부는 상기 정류회로와 제1 LED 간의 접속라인에 병렬 접속되어 상기 전원부의 교류전원을 입력신호로써 입력받거나 또는 상기 전원공급부와 정류회로 간의 접속라인에 병렬 접속되어 상기 전원부의 교류전원을 입력신호로써 입력받는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The voltage adjustor is connected in parallel to a connection line between the rectifier circuit and the first LED to receive AC power of the power supply unit as an input signal, or is connected in parallel to a connection line between the power supply unit and the rectifier circuit to input AC power of the power supply unit. LED lighting driving circuit having a light amount compensation function when the power supply voltage changes, characterized in that it is input as a signal.
  9. 제 8 항에 있어서,The method of claim 8,
    상기 전원공급부 및 정류회로 간의 접속라인에 병렬 접속되는 상기 전압조정부의 접속라인에는 직렬 연결되는 한 쌍의 저항이 구비되어 상기 한 쌍의 저항 사이에서 상기 전압조정부에 대한 접속라인이 분기되는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The connection line of the voltage adjusting unit connected in parallel to the connection line between the power supply unit and the rectifier circuit is provided with a pair of resistors connected in series so that the connection line for the voltage adjusting unit is branched between the pair of resistors. LED lighting driving circuit having a light amount compensation function when the power supply voltage changes.
  10. 제 3 항에 있어서,The method of claim 3, wherein
    상기 순간전압값 검출부는 상기 전압조정부를 통해 입력되는 파형 기준의 전원전압 크기가 순간 변화할 때 해당 파형의 전압크기를 순간전압값으로 검출하는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The instantaneous voltage value detection unit has a light quantity compensation function when the power supply voltage changes when the magnitude of the power supply voltage of the waveform reference input through the voltage adjusting unit changes instantaneously as the instantaneous voltage value. LED lighting driving circuit.
  11. 제 1 항에 있어서,The method of claim 1,
    상기 스위칭 회로부들이 공통적으로 접지되는 공통 접지 저항을 더 포함하며,And further comprising a common ground resistor to which the switching circuit portions are commonly grounded.
    상기 스위칭 회로부는 상기 LED 구동부의 LED 출력단에 접속되는 동시에 상기 공통 접지 저항에 접속되는 스위칭 소자 및 상기 LED 구동부의 LED에 대한 상기 기준전압 공급부의 기준전압과 상기 공통 접지 저항의 공통전압을 비교하는 비교기를 포함하고 상기 스위칭 소자는 상기 비교기의 출력에 따라 상기 LED 구동부의 LED에 접속되는 제1 전류경로 및 상기 공통 접지 저항에 접속되는 제2 전류경로 중 어느 한 쪽으로 스위칭 동작하여 상기 공통 접지 저항의 공통전압을 가변하는 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The switching circuit unit is connected to the LED output terminal of the LED driver and at the same time the switching element connected to the common ground resistor and a comparator for comparing the reference voltage of the reference voltage supply for the LED of the LED driver and the common voltage of the common ground resistance The switching element includes a switching operation to either one of a first current path connected to the LED of the LED driving unit and a second current path connected to the common ground resistor in accordance with the output of the comparator to share the common ground resistance. LED lighting driving circuit having a light amount compensation function when the power supply voltage changes, characterized in that the voltage is variable.
  12. 제 11 항에 있어서,The method of claim 11,
    상기 스위칭 소자는 상기 LED 구동부의 LED 출력단에 드레인이 접속되고 상기 공통 접지 저항에 소스가 접속되며 상기 비교기에 게이트가 접속되는 전계효과 트랜지스터(MOS FET)인 것을 특징으로 하는 전원전압 변화 시의 광량 보상 기능을 갖는 엘이디 조명 구동회로.The switching element is a field effect transistor (MOS FET), the drain is connected to the LED output terminal of the LED driver, the source is connected to the common ground resistor, the gate is connected to the comparator, the light amount compensation when the power supply voltage change LED lighting driving circuit having a function.
PCT/KR2013/009852 2012-11-05 2013-11-01 Led light driver circuit having radiation compensation function during change in power supply voltage WO2014069939A1 (en)

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