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WO2010131889A2 - Circuit de commande de del et procédé de commande - Google Patents

Circuit de commande de del et procédé de commande Download PDF

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Publication number
WO2010131889A2
WO2010131889A2 PCT/KR2010/002986 KR2010002986W WO2010131889A2 WO 2010131889 A2 WO2010131889 A2 WO 2010131889A2 KR 2010002986 W KR2010002986 W KR 2010002986W WO 2010131889 A2 WO2010131889 A2 WO 2010131889A2
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
light emitting
load transistor
voltage
power supply
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/KR2010/002986
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English (en)
Korean (ko)
Other versions
WO2010131889A3 (fr
Inventor
박재현
윤형도
황성민
백광현
서용곤
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 Electronics Technology Institute
Original Assignee
Korea Electronics Technology Institute
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 Electronics Technology Institute filed Critical Korea Electronics Technology Institute
Publication of WO2010131889A2 publication Critical patent/WO2010131889A2/fr
Publication of WO2010131889A3 publication Critical patent/WO2010131889A3/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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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
    • H05B45/347—Dynamic headroom control [DHC]
    • 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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 light emitting diode driving circuit and a driving method, and more particularly, to a light emitting diode driving circuit and a driving method that can minimize the waste of power generated in the process of driving the light emitting diode.
  • LEDs Light emitting diodes having a long life, low power consumption, and high efficiency are widely used as lighting means of portable terminals such as mobile communication terminals and PDAs (Personal Digital Assistants).
  • a light emitting diode is a semiconductor device that emits light when a forward voltage is applied.
  • the light output of the light emitting diode is determined by the forward current, and as shown by the current-voltage characteristic curve of the light emitting diode, the change in the forward current is very large due to the small change in the forward voltage. For this reason, the light emitting diode driving circuit requires to keep the desired load current constant at all times, not to control the output voltage.
  • a light emitting diode driving circuit including a constant current source circuit is used to generate a plurality of light emitting diodes with uniform brightness.
  • the constant current source circuit of the conventional LED driving circuit uses a method of feeding back a voltage across a resistor connected in series to the LED in order to control the load current.
  • Such a conventional LED driving circuit uses a resistor in a constant current source circuit, a voltage obtained by adding a voltage drop due to resistance to the forward voltage of a plurality of LEDs is applied to the output voltage.
  • the conventional LED driving circuit further requires power consumed by a resistor in addition to the LED.
  • this resistor since this resistor generally has a tolerance of ⁇ 10% and this is reflected as an error of the output current, there is a problem in that the current deviation of each channel is large when used in multiple channels.
  • the ripple of the output voltage generated in the DC-DC conversion process by the load current sensing value is transferred to the load current as it is, which may cause unwanted optical output ripple or flicker.
  • an object of the present invention is to provide a light emitting diode driving circuit and a driving method capable of minimizing power waste and channel current variation generated in a process of driving a light emitting diode.
  • the present invention uses a constant current source circuit to directly control the forward current of the light emitting diode, and driving the light emitting diode to control the output voltage of the power supply circuit by sensing the voltage applied to the load transistor of the constant current source circuit It provides a circuit and a driving method.
  • the present invention provides a light emitting diode driving circuit comprising a power supply circuit, a constant current source circuit, and an error amplifier.
  • the power supply circuit supplies an output voltage to the plurality of light emitting diodes.
  • the constant current source circuit is configured to control the gate of the load transistor by using a load transistor for driving the plurality of light emitting diodes and a specific bias current value, and the forward drain-source current of the load transistor is a plurality of light emissions as a constant current value. It is driven by input to diode.
  • the error amplifier outputs a voltage value proportional to the difference between the drain-source voltage and the reference voltage of the load transistor.
  • the pulse width modulated signal is generated using the output voltage value of the error amplifier, and the output voltage of the power supply circuit is controlled using the pulse width modulated signal.
  • the error amplifier feeds back the drain-source voltage of the load transistor to the power supply circuit so that the minimum drain-source voltage at which the load transistor can operate in a saturation region is the load.
  • the output voltage of the power supply circuit is controlled to be applied to a transistor.
  • the constant current source circuit controls the light output of the light emitting diode through the control of the specific bias current value.
  • the constant current source circuit may be composed of a current reference circuit or a Darlington circuit, such as various types of current mirror circuits.
  • the power supply circuit includes one of a Boost type, a Buck type, a Buck-Boost type, or an AC-DC SMPS circuit.
  • the Boost type, Buck type, and Buck-Boost type circuits may be DC-DC transformer circuits of a pulse width modulation method.
  • the constant current source circuit includes a plurality of load transistors, and a plurality of light emitting diodes respectively connected to the plurality of load transistors may be connected in parallel.
  • the load transistor may be one of a field effect transistor or a bipolar transistor.
  • the present invention also provides a power supply circuit for supplying an output voltage to a plurality of light emitting diodes, and the constant current source circuit controls the gate of the load transistor using a specific bias current value, thereby controlling the drain-source of the load transistor.
  • the present invention provides a light emitting diode driving method including a control step of generating a pulse width modulated signal using an output voltage value of an amplifier and controlling an output voltage of the power supply circuit using the pulse width modulated signal.
  • the forward current of the light emitting diode inputted from the load transistor is directly controlled through a constant current source circuit such as a current mirror or a Darlington circuit, it is possible to suppress ripple and flicker of the load current.
  • the light emitting diode driving circuit senses the drain-source voltage of the load transistor to control the output voltage of the power supply circuit, thereby minimizing power loss compared to the sensing method using a conventional resistor.
  • the error amplifier feeds back the drain-source voltage of the load transistor to the power supply circuit, thereby controlling the output voltage of the power supply circuit so that the minimum drain-source voltage that the load transistor can operate in the saturation region is applied to the load transistor to emit light.
  • the power loss of the diode driving circuit can be minimized.
  • a constant current source such as a current mirror inside an integrated circuit without using a current sensing resistor, only output current deviations due to mismatches of transistors or asymmetry of semiconductor layout designs occurring in a semiconductor process are obtained.
  • the constant current source circuit can control the light output including on / off of the light emitting diode through the gate control of the load transistor using a specific bias current value, it is possible to control the light output of the light emitting diode. There is no need to provide a separate transistor for the manufacturing cost of the LED driving circuit can be lowered and the design can be simplified.
  • FIG. 1 is a view showing a light emitting diode driving circuit according to the present invention.
  • FIG. 2 is a view showing a light emitting diode driving circuit according to a first embodiment of the present invention.
  • FIG. 3 is a view showing a light emitting diode driving circuit according to a second embodiment of the present invention.
  • FIG. 4 is a view showing a light emitting diode driving circuit according to a third embodiment of the present invention.
  • FIG. 5 is a view showing a light emitting diode driving circuit according to a fourth embodiment of the present invention.
  • the LED driving circuit 100 includes a power supply circuit 10, a constant current source circuit 30, and an error amplifier 40, and includes a constant current source circuit ( 30 directly controls the forward current of the light emitting diode 20.
  • the power supply circuit 10 supplies the output voltage V OUT to the plurality of light emitting diodes 20 connected in series.
  • the constant current source circuit 30 controls the gate of the load transistor Sink Tr by using a load transistor Sink Tr for driving the plurality of light emitting diodes 20 and a specific bias current value I LED .
  • the drain-source current of Sink Tr is input to the plurality of light emitting diodes 20 and driven as a constant current value.
  • the error amplifier 40 receives the drain-source voltage and the reference voltage V REF of the load transistor Sink Tr and outputs a voltage value proportional to the difference, and the output voltage value is the power supply circuit 10. Is input to the pulse width modulator. At this time, the power supply circuit 10 varies the output voltage V OUT according to the control signal of which the output of the error amplifier 40 is pulse width modulated.
  • the LED driving circuit 100 according to the present invention will be described in detail as follows.
  • the power supply circuit 10 supplies an output voltage V OUT to the anodes of the plurality of light emitting diodes 20 connected in series by varying an input voltage V IN applied from the outside.
  • V IN applied from the outside.
  • the power supply circuit 10 includes one of a Boost type, a Buck type, a Buck-Boost type, or an AC-DC SMPS circuit.
  • FIG. 2 shows a Boost type power supply circuit 10a
  • FIG. 3 shows a Buck type power supply circuit 10b
  • the Boost type and Buck type circuits may be DC-DC transformers 12a and 12b controlled by a pulse width modulation (PWM) scheme.
  • PWM pulse width modulation
  • the Buck-Boost type circuit may also be a pulse width modulation DC-DC conversion circuit.
  • the constant current source circuit 30 may be configured as a current reference circuit or a Darlington circuit, such as a current mirror circuit.
  • the constant current source circuit 30 directly controls the forward current of the light emitting diode 20 input from the load transistor Sink Tr and controls the drain-source voltage applied to the load transistor Sink Tr. That is, when the gate of the load transistor Sink Tr is controlled using a specific bias current value I LED , the load transistor Sink Tr inputs a drain-source current to the plurality of light emitting diodes 20 connected in series. That is, the constant current source circuit 30 directly controls the forward current of the light emitting diode 20 by adjusting the specific bias current value I LED .
  • the load transistor Sink Tr may be one of a field effect transistor (FET) or a bipolar junction transistor (BJT).
  • the field effect transistor includes a metal oxide semiconductor (MOS) and a depletion MOS (DMOS), and includes n-type and p-type according to the shape of the constant current source.
  • Bipolar transistors include npn, pnp or Darlington pairs, depending on the type of constant current source.
  • the error amplifier 40 feeds back the drain-source voltage of the load transistor Sink Tr to the power supply circuit 10 so that the minimum drain-source voltage at which the load transistor Sink Tr can operate in a saturation region is the load transistor (
  • the output voltage V OUT of the power supply circuit 10 is controlled to be applied to the sink Tr. That is, the error amplifier 40 senses the drain-source voltage of the load transistor Sink Tr to control the output voltage V OUT of the power supply circuit 10.
  • the constant current source circuit 30 can directly control the light output including the on / off of the light emitting diode 20 by controlling a specific bias current value (I LED ), the light emitting diode 20 It is not necessary to have a separate transistor for controlling the light output of the. At this time, the specific bias current value (I LED ) can be adjusted directly or through pulse width control.
  • the LED driving circuit 100 directly controls the forward current of the LED 20 input from the load transistor Sink Tr through a constant current source circuit 30 such as a current mirror or a Darlington circuit. Therefore, ripple and flicker generation of the load current can be suppressed.
  • the light emitting diode driving circuit 100 senses the drain-source voltage of the load transistor Sink Tr to control the output voltage V OUT of the power supply circuit 10, thereby sensing using a conventional resistor. In comparison, power loss can be minimized.
  • the error amplifier 40 feeds back the drain-source voltage of the load transistor Sink Tr to the power supply circuit 10 so that the minimum drain-source voltage at which the load transistor Sink Tr can operate in a saturation region is loaded.
  • the power loss of the LED driving circuit 100 can be minimized by controlling the output voltage V OUT of the power supply circuit 10 to be applied to the transistor Tink.
  • the constant current source circuit 30 can control the light output including on / off of the light emitting diode 20 by controlling the specific bias current value I LED , the light emitting diode 20 It is not necessary to provide a separate transistor for controlling the light output of the LED can reduce the manufacturing cost of the LED driving circuit 100 and can simplify the design.
  • the light emitting diode driving circuit 100a includes a boost type power supply circuit 10a, as shown in FIG. 2.
  • the power supply circuit 10a is a boosting circuit for boosting the input voltage V IN to an output voltage V OUT required to drive the plurality of light emitting diodes 20.
  • the boost-type DC-DC conversion circuit 12a is provided.
  • a pulse width modulator 14a for controlling the output voltage V OUT of the DC-DC conversion circuit 12a in a pulse width modulation scheme.
  • the DC-DC conversion circuit 12a includes an inductance L 1 , a semiconductor switch D 1 , a capacitor C OUT , and a driving transistor M 1 .
  • the inductance L 1 , the semiconductor switch D 1 , and the capacitor C OUT are connected in series with respect to the input voltage V IN .
  • the driving transistor M 1 is connected in parallel between the inductance L 1 and the semiconductor switch D 1 .
  • the pulse width modulator 14a controls the gate input signal of the driving transistor M 1 in a pulse width modulation scheme to vary the output voltage V OUT output from the DC-DC conversion circuit 12a to provide an optimal load transistor. (Sink Tr) Drain-source voltage is obtained.
  • the LED driving circuit 100a directly controls the forward current of the LED 20 through the constant current source circuit 30 and senses the drain-source voltage of the load transistor Sink Tr.
  • the output voltage V OUT of the power supply circuit 10 is controlled by the pulse width control method.
  • the drain-source voltage of the load transistor Sink Tr depends on the output voltage V OUT of the DC-DC conversion circuit 12a for a specific current value I LED .
  • the output voltage V OUT of the DC-DC conversion circuit 12a is controlled so that the voltage becomes a minimum voltage for driving the constant current source circuit 30. That is, the error amplifier 40 receives the drain-source voltage and the reference voltage V REF of the load transistor Sink Tr, respectively, and applies a voltage value proportional to the difference, and the pulse width modulator 14a of the power supply circuit 10a. Is applied.
  • the pulse width modulator 14a controls the gate input signal of the driving transistor M 1 according to the voltage received from the error amplifier 40 by using a pulse width modulation method to output the output voltage from the DC-DC conversion circuit 12a. Change (V OUT ).
  • the error amplifier 40 feeds back the drain-source voltage of the load transistor Sink Tr to the power supply circuit 10a so that the minimum drain-source voltage at which the load transistor Sink Tr can operate in a saturation region is the load transistor.
  • the output voltage V OUT of the power supply circuit 10a is controlled to be applied to the sink Tr.
  • the light emitting diode driving circuit 100a includes an Boost type power supply circuit 10a, as shown in FIG. 3, the LED driving circuit 100a may include a Buck type power supply circuit 10b. have.
  • the LED driving circuit 100b includes a Buck type power supply circuit 10b.
  • the power supply circuit 10b is a pressure reduction circuit for reducing the input voltage V IN to the output voltage V OUT required to drive the plurality of light emitting diodes 20, and a Buck type DC-DC conversion circuit 12b. And a pulse width modulator 14b for controlling the output voltage V OUT of the DC-DC conversion circuit 12b in a pulse width modulation scheme.
  • the DC-DC conversion circuit 12b includes an inductance L 1 , a semiconductor switch D 1 , a capacitor C OUT , and a driving transistor M 1 .
  • the driving transistor M 1 and the inductance L 1 are connected in series with respect to the input voltage V IN , and the semiconductor switch D 1 is connected in parallel between the driving transistor M 1 and the inductance L 1 . do.
  • the capacitor C OUT is connected between the output terminal of the DC-DC change circuit 12b and the ground voltage.
  • the pulse width modulator 14b controls the gate input signal of the driving transistor M 1 in a pulse width modulation scheme to vary the output voltage V OUT output from the DC-DC conversion circuit 12a to provide an optimal load transistor. (Sink Tr) Drain-source voltage is obtained.
  • the LED driving circuit 100b directly controls the forward current of the LED 20 through the constant current source circuit 30 and senses the drain-source voltage of the load transistor Sink Tr. Since the output voltage V OUT of the power supply circuit 10b is controlled by the pulse width control method, it has the same configuration as that of the first embodiment, and thus the detailed description thereof will be omitted.
  • the light emitting diode driving circuit 100c includes a power supply circuit 10c of the AC-DC SMPS circuit type, as shown in FIG. 4.
  • the light emitting diode driving circuit 100c includes a power supply circuit 10c of the AC-DC SMPS circuit type which outputs AC power as an output voltage V OUT of DC.
  • the power supply circuit 10c includes a rectifier circuit, a transformer, a power semiconductor, and the like.
  • the LED driving circuit 100c directly controls the forward current of the LED 20 through the constant current source circuit 30 and senses the drain-source voltage of the load transistor Sink Tr. Since the output voltage V OUT of the power supply circuit 10b is controlled by the pulse width control method, it has the same configuration as that of the first embodiment, and thus the detailed description thereof will be omitted.
  • one constant current source circuit 30 may include a plurality of load transistors (sink tr. 1, sink tr. 2,..., Sink tr. N).
  • FIG. 5 is a view showing a light emitting diode driving circuit according to a fourth embodiment of the present invention.
  • the light emitting diode driving circuit 100d includes one load transistor (sink tr. 1, sink tr. 2,..., Sink tr. N). And a constant current source circuit 30.
  • a plurality of light emitting diodes 20 are connected to a plurality of load transistors (sink tr.1, sink tr. 2, ..., sink tr. N), respectively, and a plurality of load transistors (sink tr. 1, sink tr. ..., the plurality of light emitting diodes 20 respectively connected to the sink tr.n have a parallel structure again. Since the other structure has the same structure as the light emitting diode driving circuit (100b of FIG. 3) according to the second embodiment, detailed description thereof will be omitted.
  • the light emitting diode driving circuit 100d is a multi-channel driving light emitting diode driving circuit necessary for driving the plurality of light emitting diodes 20 in parallel, and uses one constant current source circuit 30.
  • a plurality of channels are driven by a plurality of load transistors (sink tr.1, sink tr.2, ..., sink tr.n). Therefore, there is no mismatch due to the current sensing resistor, and there is only a deviation of the output current due to mismatch in the semiconductor process of each load transistor (sink tr.1, sink tr.2, ..., sink tr.n). Therefore, the current deviation of each channel can be minimized.
  • the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention.
  • the lighting circuit using the light emitting diode is exemplified, but may be used in other constant current driving circuits.

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Abstract

L'invention concerne un circuit de commande de DEL et un procédé de commande réduisant au minimum les pertes d'énergie survenant lorsqu'une DEL est commandée par le biais d'une source de courant constant et qu'il se produit une déviation de courant pour chaque canal en cas de commande multicanal. Selon l'invention, un circuit d'alimentation fournit une tension de sortie à plusieurs DEL. Un circuit de source de courant constant injecte un courant drain-source de transistor de charge comme valeur de courant constant dans plusieurs DEL en commandant une grille du transistor de charge par le biais d'une valeur de courant de polarisation spécifique afin de commande la pluralité de DEL. Un amplificateur d'erreur fournit en sortie une valeur de tension proportionnelle à une différence entre une tension drain-source du transistor de charge et une tension de référence. De plus, un signal à modulation d'impulsions en durée est généré au moyen d'une valeur de tension de sortie de l'amplificateur d'erreur, et une tension de sortie du circuit d'alimentation est régulée au moyen de ce signal. A ce stade, l'amplificateur d'erreur retourne la tension drain-source du transistor de charge au circuit d'alimentation pour réguler une tension de sortie de ce circuit et faire en sorte que la tension drain-source minimum, utilisée pour le fonctionnement du transistor de charge dans une zone de saturation, soit appliquée au transistor de charge. Par ailleurs, plusieurs transistors de charge sont connectés à un circuit de source de courant constant pour commander plusieurs DEL reliées en parallèle, de manière à constituer un circuit de commande de DEL multicanal en vue de réduire au minimum la déviation de courant pour chaque canal.
PCT/KR2010/002986 2009-05-11 2010-05-11 Circuit de commande de del et procédé de commande Ceased WO2010131889A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2009-0040677 2009-05-11
KR1020090040677A KR101028587B1 (ko) 2009-05-11 2009-05-11 발광다이오드 구동 회로 및 구동 방법

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WO2010131889A2 true WO2010131889A2 (fr) 2010-11-18
WO2010131889A3 WO2010131889A3 (fr) 2011-01-27

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* Cited by examiner, † Cited by third party
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WO2013007523A1 (fr) * 2011-07-11 2013-01-17 Ams Ag Ensemble d'alimentation en tension et procédé d'alimentation en tension d'une charge électrique, avec régulation de saturation de transistor
CN103167672A (zh) * 2011-12-09 2013-06-19 金德奎 一种led照明供电及驱动控制系统
WO2014187004A1 (fr) * 2013-05-20 2014-11-27 深圳市华星光电技术有限公司 Circuit de pilotage de rétro-éclairage par led, module de rétroéclairage et appareil d'affichage à cristaux liquides
US9237609B2 (en) 2013-05-20 2016-01-12 Shenzhen China Star Optoelectronics Technology Co., Ltd LED backlight driving circuit, backlight module, and LCD device
CN105376899A (zh) * 2014-09-02 2016-03-02 无锡华润华晶微电子有限公司 一种buck型发光二极管电路
CN105451408A (zh) * 2014-09-02 2016-03-30 无锡华润华晶微电子有限公司 一种buck型发光二极管电路
CN107343344A (zh) * 2017-09-04 2017-11-10 矽力杰半导体技术(杭州)有限公司 用于led驱动器的控制电路、集成电路和led驱动器
CN110838789A (zh) * 2018-08-17 2020-02-25 美芯晟科技（北京）有限公司 一种纹波抑制电路、系统及其方法
US11075502B2 (en) 2019-08-29 2021-07-27 Analog Devices, Inc. Laser diode driver circuit techniques
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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101939226B1 (ko) 2012-04-12 2019-04-10 엘지이노텍 주식회사 엘이디 구동 장치
CN103237381B (zh) * 2013-04-01 2016-04-20 天津天地伟业数码科技有限公司 用于红外监控的滤光片切换电路及滤光片切换方法
US10111290B2 (en) 2014-08-18 2018-10-23 Point Tek Co., Ltd. Apparatus for synchronous driving of multi-channel light emitting diodes
KR102539962B1 (ko) 2017-09-05 2023-06-05 삼성전자주식회사 Led 구동 장치 및 조명 장치
WO2024253430A1 (fr) * 2023-06-07 2024-12-12 삼성전자 주식회사 Circuit de commande de marge de circuit d'attaque de diode électroluminescente, et son procédé de fonctionnement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980079069A (ko) * 1997-04-30 1998-11-25 배순훈 전류 미러
JP2001215913A (ja) 2000-02-04 2001-08-10 Toko Inc 点灯回路
DE602004008840T2 (de) * 2003-07-07 2008-06-19 Rohm Co., Ltd., Kyoto Lasttreibervorrichtung und tragbare Vorrichtung, die solche Lasttreibervorrichtung verwendet
JP4809030B2 (ja) 2005-09-28 2011-11-02 株式会社リコー 駆動回路及びその駆動回路を用いた電子機器

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US9078320B2 (en) 2011-07-11 2015-07-07 Ams Ag Voltage supply arrangement and method for supplying voltage to an electrical load with transistor saturation control
WO2013007523A1 (fr) * 2011-07-11 2013-01-17 Ams Ag Ensemble d'alimentation en tension et procédé d'alimentation en tension d'une charge électrique, avec régulation de saturation de transistor
CN103703867A (zh) * 2011-07-11 2014-04-02 ams有限公司 用于使用晶体管饱和控制将电压供应到电力负载的电压供应设备和方法
CN103167672B (zh) * 2011-12-09 2017-04-19 金德奎 一种led照明供电及驱动控制系统
CN103167672A (zh) * 2011-12-09 2013-06-19 金德奎 一种led照明供电及驱动控制系统
US9237609B2 (en) 2013-05-20 2016-01-12 Shenzhen China Star Optoelectronics Technology Co., Ltd LED backlight driving circuit, backlight module, and LCD device
WO2014187004A1 (fr) * 2013-05-20 2014-11-27 深圳市华星光电技术有限公司 Circuit de pilotage de rétro-éclairage par led, module de rétroéclairage et appareil d'affichage à cristaux liquides
CN105451408B (zh) * 2014-09-02 2018-10-09 无锡华润华晶微电子有限公司 一种buck型发光二极管电路
CN105451408A (zh) * 2014-09-02 2016-03-30 无锡华润华晶微电子有限公司 一种buck型发光二极管电路
CN105376899A (zh) * 2014-09-02 2016-03-02 无锡华润华晶微电子有限公司 一种buck型发光二极管电路
CN105376899B (zh) * 2014-09-02 2019-01-08 无锡华润华晶微电子有限公司 一种buck型发光二极管电路
CN107343344A (zh) * 2017-09-04 2017-11-10 矽力杰半导体技术(杭州)有限公司 用于led驱动器的控制电路、集成电路和led驱动器
CN107343344B (zh) * 2017-09-04 2019-11-22 矽力杰半导体技术(杭州)有限公司 用于led驱动器的控制电路、集成电路和led驱动器
CN110838789A (zh) * 2018-08-17 2020-02-25 美芯晟科技（北京）有限公司 一种纹波抑制电路、系统及其方法
CN110838789B (zh) * 2018-08-17 2021-06-04 美芯晟科技（北京）有限公司 一种纹波抑制电路、系统及其方法
US11075502B2 (en) 2019-08-29 2021-07-27 Analog Devices, Inc. Laser diode driver circuit techniques
CN114096040A (zh) * 2021-11-17 2022-02-25 启攀微电子（上海）有限公司 一种双路独立控制闪光灯驱动结构
CN114286473A (zh) * 2021-12-20 2022-04-05 启攀微电子（上海）有限公司 一种创新型闪光灯驱动结构

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WO2010131889A3 (fr) 2011-01-27
KR101028587B1 (ko) 2011-04-12

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