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WO2011159002A1 - Circuit de commande de led à courant constant sinusoïdal et procédé associé - Google Patents

Circuit de commande de led à courant constant sinusoïdal et procédé associé Download PDF

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Publication number
WO2011159002A1
WO2011159002A1 PCT/KR2010/008423 KR2010008423W WO2011159002A1 WO 2011159002 A1 WO2011159002 A1 WO 2011159002A1 KR 2010008423 W KR2010008423 W KR 2010008423W WO 2011159002 A1 WO2011159002 A1 WO 2011159002A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
led
current
connection point
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2010/008423
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English (en)
Korean (ko)
Inventor
김종현
류명효
백주원
서길수
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Electrotechnology Research Institute KERI
Original Assignee
Korea Electrotechnology Research Institute KERI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Electrotechnology Research Institute KERI filed Critical Korea Electrotechnology Research Institute KERI
Publication of WO2011159002A1 publication Critical patent/WO2011159002A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H05B45/395—Linear regulators
    • 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 a LED driving circuit and method, in order to directly drive a light emitting diode (LED) to an alternating current (AC) power source, driving an input AC current with a sinusoidal current suitable for harmonic regulation and power factor regulation,
  • the present invention relates to a LED driving circuit and a method capable of driving at a constant current so that the current is kept constant even when the input AC voltage is fluctuated so that the flicker characteristic is excellent.
  • the conventional LED driving circuit applies an AC power supply voltage Vac to two input terminals of the bridge diodes D1 to D4, and sends a current rectified by the bridge diodes D1 to D4 to the resistor R.
  • the LEDs D 1 , 1 to D n , n provided to be connected in parallel to the LED module are driven to emit light.
  • the conventional LED driving circuit by controlling the current of the resistor R has a very easy and simple structure.
  • the AC power supply voltage Vac in order to supply a constant current to the LED module, the AC power supply voltage Vac must always be supplied at a constant voltage.
  • the AC supply voltage Vac is a voltage of 10-20% of the voltage of a commercial system, and the voltage fluctuation rate may be even higher in a dense or commercial area where a large capacity induction device is used.
  • voltages in commercial systems have a frequency variation of less than 5%.
  • the conventional LED driving circuit using only the resistance R as described above is very limited in constant current driving to secure the lifetime and light characteristics of the LED, and thus may cause flicker (light flicker) and the like. Failure to maintain a constant Vf (operating voltage) of the changing LED can be a factor to shorten the life of the LED.
  • an object of the present invention is to solve the above-described problems, and an object of the present invention is to drive an input AC current with a sinusoidal current suitable for harmonic regulation and power factor regulation in driving an LED directly with an AC power supply, and input AC
  • the present invention provides a LED driving circuit and a method capable of driving a constant current to maintain excellent flicker characteristics even with a change in voltage.
  • the LEDs of the parallel connection provided in the LED module are controlled so that each connection point connected in series is driven independently, so that the current coming from each connection point is basically a constant current, wherein the LEDs of each parallel connection have a specific forward direction.
  • the present invention provides a LED driving circuit and method capable of emitting light by allowing a constant current to flow for a short time when a voltage is formed, or emitting light by continuously flowing a constant current, or emitting both in parallel.
  • the LED drive circuit for driving an LED module having a plurality of LEDs connected in series in accordance with an aspect of the present invention for achieving the above object of the present invention
  • the AC power is received by direct current Rectifier for rectifying and supplying the rectified power to the LED module
  • a control circuit connected to each connection point of the series-connected LEDs to control respective currents flowing from each connection point to the ground terminal.
  • Each of the plurality of LEDs connected in series in the LED module includes a plurality of LEDs connected in parallel.
  • the rectifying portion is made of a bridge diode.
  • the control circuit is configured to sequentially emit light of the series-connected LEDs as power supplied to the LED module increases, and to include next-emitted LEDs so that the next LEDs may emit light together. Control the current to have the same amount of current.
  • control circuit may sequentially emit the plurality of LEDs connected in series as power supplied to the LED module increases, but currents flowing from the connection point to the ground terminal are turned off so that the previous LEDs are turned off and the next LED emits light. Control to have increased current as a constant increase function.
  • control circuit may sequentially emit the plurality of LEDs connected in series as the power supplied to the LED module increases, but may flow from the respective connection points to the ground terminal so that the next LED may emit the same together, including the previously emitted LEDs.
  • a first way of controlling each current to have the same magnitude of current is applied to some of the plurality of LEDs, the currents flowing from the junction to the ground terminal so that the previous LEDs are off and the next LED emits a constant increase function.
  • the second method of controlling to have an increased current is applied to the rest of the plurality of LEDs other than the part to which the first method is applied.
  • the control circuit turns on or off a control rectifying element at each connection point according to the magnitude of the current flowing through the switch to the ground terminal, so that the switch connects or opens between each connection point and ground.
  • the LED driving method for driving an LED module having a plurality of LEDs connected in series includes receiving an AC power using a bridge diode to rectify the DC and supplying the rectified power to the LED module. step; And controlling each current flowing from each connection point of the series-connected LEDs to the ground terminal.
  • each connection point connected in series with the LEDs of the parallel connection provided in the LED module by controlling each connection point connected in series with the LEDs of the parallel connection provided in the LED module to be driven independently, so that the current coming from each connection point is basically a constant current, at this time
  • the LEDs in each parallel connection can cause a constant current to flow for only a short time when a specific forward voltage is formed, or to continuously flow a constant current, or drive the LED modules in parallel.
  • the input AC current can be driven with a sinusoidal current suitable for harmonic regulation and power factor regulation, and the LED module can be driven so that the constant current is maintained even when the input AC voltage is fluctuated so as to have excellent flicker characteristics.
  • the LED driving circuit according to the present invention is a transistor without an energy storage device. And, since it consists of a circuit that can be implemented in a semiconductor such as a resistor can be easily integrated into a semiconductor circuit.
  • 1 is a view for explaining a conventional LED driving circuit.
  • FIG. 2 is a view for explaining an LED driving circuit according to an embodiment of the present invention.
  • FIG. 3 is a block diagram of a control circuit according to an embodiment of the present invention.
  • FIG. 4 is a view for explaining a horizontal sum current driving method according to an embodiment of the present invention.
  • FIG. 5 is a view for explaining a vertical sum current driving method according to an embodiment of the present invention.
  • FIG. 6 is a view for explaining a combined current driving method according to an embodiment of the present invention.
  • FIG. 7 is a view for explaining the generation of sinusoidal current of the current driving schemes according to the present invention.
  • FIG. 8 is a view for explaining a measurement waveform of the LED driving circuit according to an embodiment of the present invention.
  • FIG. 2 is a view for explaining the LED driving circuit 10 according to an embodiment of the present invention.
  • the LED driving circuit 10 includes a bridge diode 11 and a control circuit 12 to drive the LED module 13.
  • the bridge diode 11 is a rectifying circuit that receives the AC power Vac and rectifies the DC.
  • the bridge diode 11 supplies the rectified power to the LED module 13 through two output terminals.
  • two sets of two diodes D1, D2 / D3, and D4 connected in series are connected in parallel, the series connection points are input terminals of the AC power supply Vac, and the parallel connection points are output terminals. .
  • the LEDs of the LED module 13 may emit light according to the rectified power source from the bridge diode 11.
  • the LED module 13 includes a plurality of LEDs connected in series (eg, D 1 , 1 , D 1 , 2 , .., D 1, n-1 , D 1 , n ), as shown in FIG. 2, in parallel Multiple LEDs connected (for example, D 1 , 1 , .. D n , 1 in parallel, D 1 , 2 , .. D n , 2 in parallel, .., D 1 , n-1 , .. D n , a plurality of sets of parallel, D 1, n, D n .., n of the parallel n- 1) may be a structure in series.
  • the control circuit 12 is connected to each connection point of a plurality of LEDs connected in series of the LED module 13, and controls each current flowing from each connection point to the ground terminal.
  • the control circuit 12 controls each connection point of the plurality of LEDs connected in series of the LED module 13 to be driven independently, so that the current coming from each connection point is basically a constant current, and at this time, the plurality of LEDs connected in series Each (may be each set of parallel-connected LEDs) allows a constant current to flow for only a short time when a specific forward voltage is formed, or to continuously flow a constant current, or both in parallel You can also drive.
  • FIG. 3 is a block diagram of a control circuit 12 according to an embodiment of the present invention.
  • the control circuit 12 may include connection points YN 1 , YN 2 , .. YN n ⁇ 1 , YN of a plurality of LEDs connected in series of the LED module 13. n ) connected to a switch (e.g. Q1), a control rectifying element (e.g. SCR: Silicon Controlled Rectifier) (e.g. REG1), resistors (e.g. R 1 , R sen _1 ) It may include a bias circuit for supplying a constant DC bias voltage (V B ) to each connection point.
  • the switch referred to herein may be a metal oxide semiconductor field effect transistor (MOSFET), in particular, may be an N-type MOSFET as shown in FIG. 3, and in some cases, may be replaced by a P-type MOSFET with some circuit changes.
  • MOSFET metal oxide semiconductor field effect transistor
  • the bias circuit includes a resistor (R B ) and a zener diode (ZD 1 ) connected in series between a constant power supply (CN) and ground, and the gate and drain terminals of the switch (Q B ) are connected across the resistor (R B ). And a bias voltage V B may be output through a source, which is the remaining terminal of the switch Q B.
  • connection point (YN 1 , YN 2 , .., YN n -1 , YN n )
  • the control rectifying element eg, depending on the magnitude of the current flowing through the switch (eg Q1) to the ground terminal) , REG1 on or off, so that a switch (e.g., Q1) connects each connection point (YN 1 , YN 2 , .., YN n-1 , YN n ) to ground. Or open it.
  • the current from each connection point (YN 1 , YN 2 , ..., YN n -1 , YN n ) is controlled to be a constant current, and at this time, each of the plurality of LEDs connected in series
  • the constant current may flow for only a short time, the constant current may flow continuously, or both may drive the LED module 13 in parallel.
  • control circuit 12 The operation of the control circuit 12 will be described in more detail with reference to FIGS. 4 to 8.
  • FIG. 4 is a view for explaining a horizontal sum current driving method according to an embodiment of the present invention.
  • the control circuit 12 includes the respective currents i D1 , which flow from the respective connection points YN 1 , YN 2 ,..., YN n ⁇ 1 , YN n to the ground terminal in the horizontal sum current driving scheme.
  • i D2 .., i Dn -1 , i Dn
  • the plurality of series-connected LEDs of the LED module 13 are sequentially lighted, but the previously emitted LEDs are lighted. Including the next LED to emit light together, each of the current flowing out of the lighted LED through the control circuit 12 to the ground terminal can be controlled to have the same current.
  • the operation of the control circuit 12 is the size of the switch connected to each connection point (YN 1 , YN 2 , .., YN n-1 , YN n ), the active voltage of the control rectifying element, This can be done by making the sizes of the resistors the same.
  • FIG. 5 is a view for explaining a vertical sum current driving method according to an embodiment of the present invention.
  • the control circuit 12 has a constant increasing function (eg, a current) flowing to the ground terminal at each connection point YN 1 , YN 2 , .., YN n -1 , YN n in the vertical sum current driving scheme. For example, it can be controlled to have an increased current by the sinusoidal function).
  • a constant increasing function eg, a current
  • the magnitude of each of the currents i D1 , i D2 , .., i Dn ⁇ 1 , i Dn is different, and as the power supplied from the bridge diode 11 to the LED module 13 increases ( For example, the sine wave LED module 13 sequentially emits a plurality of LEDs connected in series, but turns off the previously emitted LEDs and causes the next LED to emit, while exiting the emitted LEDs and through the control circuit 12 to the ground terminal.
  • the flowing currents can be controlled to have an increased current with a constant increase function (eg, sinusoidal function).
  • the operation of the control circuit 12 is the size of the switch connected to each connection point (YN 1 , YN 2 , .., YN n-1 , YN n ), the active voltage of the control rectifying element, This can be done by setting the sizes of the resistors accordingly.
  • each connection point (YN 1 , YN 2 , .., Each current flowing out from YN n -1 and YN n to the ground terminal through the control circuit 12 is controlled by a constant current, so that flicker generation can be suppressed even when the voltage Vac is changed. As shown in FIG. 8, it was confirmed that the sine wave constant current appeared.
  • FIG. 6 is a view for explaining a combined current driving method according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a combination of a horizontal sum current driving method as shown in FIG. 4 and a vertical sum current driving method as shown in FIG. 5.
  • control circuit 12 may apply the horizontal sum current driving method as shown in FIG. 4 to some of the plurality of LEDs connected in series in the combination current driving method, and the LED module ( The vertical sum type current driving method as shown in FIG. 5 may be applied to the remaining of the plurality of LEDs connected in series in FIG. 13.
  • connection points YN 1 , YN 2 , .. YN n -1 , YN n for some of the plurality of LEDs connected in series in the LED module 13 in the circuit as shown in FIG. 3.
  • YN n-1 , YN n may be appropriately determined by differently determining the size of the switch connected to the active rectifier element, the size of the active voltage of the control rectifying element, and the size of the resistors.
  • the LED driving circuit 10 is composed of a circuit which can be implemented as a semiconductor such as a transistor and a resistor without using an energy reservoir such as L (inductor or transformer) and C (capacitor), It can be easily integrated and implemented.
  • L inductor or transformer
  • C capacitor

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

Abstract

Le circuit de commande de LED destiné à commander un module de LED qui présente une pluralité de LED connectées en série le long d'une surface, de la présente invention comprend : un pont de diodes destiné à redresser un courant alternatif entrant en un courant continu et à fournir ensuite un courant redressé au module de LED ; et un circuit de commande connecté en des points de contact respectifs à la pluralité de LED connectées en série, de façon à commander le courant qui circule à partir de chaque point de contact vers une borne de masse.
PCT/KR2010/008423 2010-06-15 2010-11-26 Circuit de commande de led à courant constant sinusoïdal et procédé associé Ceased WO2011159002A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2010-0056683 2010-06-15
KR1020100056683A KR20110136577A (ko) 2010-06-15 2010-06-15 정현파 정전류 ｌｅｄ 구동 회로 및 방법

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Publication Number Publication Date
WO2011159002A1 true WO2011159002A1 (fr) 2011-12-22

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KR (1) KR20110136577A (fr)
WO (1) WO2011159002A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103090237A (zh) * 2013-01-31 2013-05-08 东莞市贺喜光电有限公司 一种无电源供应器的led灯
WO2014148767A1 (fr) * 2013-03-21 2014-09-25 서울반도체 주식회사 Circuit de pilotage de del utilisant des diodes en double pont et dispositif d'éclairage à del le comprenant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101360326B1 (ko) * 2012-01-20 2014-02-12 한국과학기술원 균등수명 선형 스위칭 엘이디 장치 및 그를 이용한 엘이디 조명장치
CN103124461B (zh) * 2013-01-21 2015-04-01 厦门海莱照明有限公司 一种led线性智能调光模块

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003513420A (ja) * 1999-11-01 2003-04-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 照明用ｌｅｄアレイによる３次元格子構造
JP2004134249A (ja) * 2002-10-10 2004-04-30 Mitsubishi Electric Corp 照明装置
KR20050006042A (ko) * 2003-07-07 2005-01-15 로무 가부시키가이샤 부하 구동 장치 및 휴대 기기
JP2005257790A (ja) * 2004-03-09 2005-09-22 Olympus Corp 照明装置及びそれを用いた画像投影装置
KR100941510B1 (ko) * 2009-07-01 2010-02-10 주식회사 실리콘마이터스 Ｌｅｄ 발광 장치 및 그 구동 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003513420A (ja) * 1999-11-01 2003-04-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 照明用ｌｅｄアレイによる３次元格子構造
JP2004134249A (ja) * 2002-10-10 2004-04-30 Mitsubishi Electric Corp 照明装置
KR20050006042A (ko) * 2003-07-07 2005-01-15 로무 가부시키가이샤 부하 구동 장치 및 휴대 기기
JP2005257790A (ja) * 2004-03-09 2005-09-22 Olympus Corp 照明装置及びそれを用いた画像投影装置
KR100941510B1 (ko) * 2009-07-01 2010-02-10 주식회사 실리콘마이터스 Ｌｅｄ 발광 장치 및 그 구동 방법

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103090237A (zh) * 2013-01-31 2013-05-08 东莞市贺喜光电有限公司 一种无电源供应器的led灯
WO2014148767A1 (fr) * 2013-03-21 2014-09-25 서울반도체 주식회사 Circuit de pilotage de del utilisant des diodes en double pont et dispositif d'éclairage à del le comprenant
US9848470B2 (en) 2013-03-21 2017-12-19 Seoul Semiconductor Co., Ltd. LED driving circuit using double bridge diode and LED illumination device comprising same

Also Published As

Publication number Publication date
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