WO2013078667A1 - Circuit d'attaque de diode électroluminescente avec fonction de protection contre le court-circuit - Google Patents

Circuit d'attaque de diode électroluminescente avec fonction de protection contre le court-circuit Download PDF

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Publication number
WO2013078667A1
WO2013078667A1 PCT/CN2011/083322 CN2011083322W WO2013078667A1 WO 2013078667 A1 WO2013078667 A1 WO 2013078667A1 CN 2011083322 W CN2011083322 W CN 2011083322W WO 2013078667 A1 WO2013078667 A1 WO 2013078667A1
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WO
WIPO (PCT)
Prior art keywords
circuit
switching unit
control chip
short
resistor
Prior art date
Application number
PCT/CN2011/083322
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English (en)
Chinese (zh)
Inventor
黎飞
Original Assignee
深圳市华星光电技术有限公司
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 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/379,888 priority Critical patent/US20130135774A1/en
Publication of WO2013078667A1 publication Critical patent/WO2013078667A1/fr

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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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • 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]
    • H05B45/38—Switched mode power supply [SMPS] using boost 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 circuit for an LED strip, and more particularly to an LED driving circuit with short-circuit protection that avoids unnecessary power consumption.
  • FIG. 1 is an LED driving circuit of a backlight module used in a liquid crystal display.
  • the driving circuit of the backlight module 90 is mainly included in the boosting circuit 90 , the driving chip 91 , and the LED string 92 .
  • the boosting circuit 90 .
  • the inductor L1, the second switch Q2, and the diode D5 are included, and the LED array 92 includes a plurality of LEDs D1 to D4.
  • a booster circuit that receives an input voltage and outputs a higher output voltage
  • a capacitor having a first end connected to the cathode of the diode and a second end connected to the control chip;
  • a second switching unit the first end of which is connected between the first inductor and the anode of the diode, the second end of which is grounded, the third end of which is connected to the control chip, and the second end is switched according to the control signal of the control chip Whether the first end and the second end of the switch unit are conductive or not.
  • the second switching unit is a power transistor, the first end of which is a drain, the second end is a source, and the third end is a gate.
  • the invention mainly connects a first switching unit between the boosting circuit and the LED array, and the control chip controls the first switching unit to be disconnected when the LED string is short-circuited, so that the input power is connected to the LED series.
  • the current loop is cut off to achieve short-circuit protection and stop power consumption.
  • 1 is a circuit diagram of a conventional LED driving circuit.
  • FIG. 2 is a circuit diagram of a preferred embodiment of the LED driving circuit with short circuit protection according to the present invention.
  • the short-circuit-protected LED driving circuit of the present invention mainly comprises a boosting circuit 10, a first switching unit Q4, an LED string 12 and a control chip 11.
  • the boosting circuit 10 is connected to an input voltage Vin for outputting an output voltage higher than the input voltage Vin.
  • the boosting circuit 10 includes a first inductor L2, a diode D10, a capacitor C1, and a second switching unit Q3.
  • the first inductor L2 is connected to the input voltage.
  • the anode of the diode D10 is connected to the first inductor L2.
  • the first end of the capacitor C1 is connected to the cathode of the diode, and the second end thereof is connected to the control chip 11.
  • the aforementioned second switching unit Q3 is preferably a power transistor, the first end of which is a drain, the second end is a source, and the third end is a gate.
  • the control chip 11 can continuously switch the second switching unit Q3 to be turned off and turned on by means of pulse width modulation (PWM) to achieve the purpose of boosting, wherein when the second switching unit Q3 is turned on, the diode D10 exhibits a reverse bias voltage, and electrical energy from the input voltage Vin is stored in the first inductor L2; when the second switching unit Q3 is turned off, the diode D10 exhibits a forward bias, and at this time, the capacitor C1 receives the input voltage Vin1 and the first The electrical energy provided by inductor L2 thus allows the output voltage to be higher than the input voltage Vin.
  • PWM pulse width modulation
  • the first switching unit Q4 is connected to the boosting circuit 10.
  • the first switching unit Q4 is a power transistor, and the drain thereof is connected to the boosting circuit through a first resistor R2.
  • the LED array 12 is connected to the first switching unit Q4, and receives the output voltage to drive and illuminate when the first switching unit Q4 is turned on; the LED string 12 includes several serially connected Light-emitting diodes D6 ⁇ D9.
  • the control chip 11 is configured to open the first switching unit Q4 when the LED string 12 is short-circuited.
  • the control chip 11 realizes constant current of the LED series 12 by comparing the voltage difference on the first resistor R2 with the constant current source inside the control chip 11, and the first The operation of switching unit Q4 is driven by capacitor C1 connected to its gate.
  • the control chip 11 can pass the detection.
  • the control chip 11 turns off the first switching unit Q4 The current loop of the input voltage Vin to the LED string 12 is cut off, and at the same time the second switching unit Q3 is turned off to turn off the booster circuit 10.
  • the short-circuit-protected LED driving circuit of the present invention has a switching unit connected between the boosting circuit and the LED string in comparison with the existing LED driving circuit, which has safety concerns and cannot be effectively saved.
  • the control chip controls the switch unit to be disconnected when the LED string is short-circuited to the ground, so that the circuit of the input power source to the LED series is cut off, and the voltage of the power supply cannot be transmitted, thereby realizing short-circuit protection and eliminating safety concerns. And avoid the purpose of energy consumption.

Landscapes

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

Abstract

L'invention concerne un circuit d'attaque de diode électroluminescente (DEL) avec une fonction de protection contre le court-circuit, comprenant un circuit élévateur (10), un premier commutateur (Q4), une chaîne de DEL (12) et une puce de commande (11) ; le circuit élévateur (10) reçoit une tension d'entrée et produit une tension de sortie, plus élevée ; le premier commutateur (Q4) est connecté entre le circuit élévateur (10) et la chaîne de DEL (12) ; la puce de commande (11) est connectée au circuit élévateur (10) et au premier commutateur (Q4) et ouvre le premier commutateur (Q4) en cas de court-circuit de la chaîne de DEL (12), si bien qu'une boucle de courant entre l'alimentation électrique d'entrée et la chaîne de DEL (12) est interrompue, ce qui assure la protection contre le court-circuit et arrête la consommation d'énergie électrique.
PCT/CN2011/083322 2011-11-29 2011-12-01 Circuit d'attaque de diode électroluminescente avec fonction de protection contre le court-circuit WO2013078667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/379,888 US20130135774A1 (en) 2011-11-29 2011-12-01 Light-emitting diode driving circuit having short circuit protection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110386800.8A CN102496343B (zh) 2011-11-29 2011-11-29 具短路保护的发光二极管驱动电路
CN201110386800.8 2011-11-29

Publications (1)

Publication Number Publication Date
WO2013078667A1 true WO2013078667A1 (fr) 2013-06-06

Family

ID=46188162

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/083322 WO2013078667A1 (fr) 2011-11-29 2011-12-01 Circuit d'attaque de diode électroluminescente avec fonction de protection contre le court-circuit

Country Status (2)

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CN (1) CN102496343B (fr)
WO (1) WO2013078667A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203301814U (zh) * 2013-05-22 2013-11-20 深圳市华星光电技术有限公司 一种低损耗异常保护电路及其驱动电路
CN104240651B (zh) * 2014-09-29 2016-10-19 深圳市华星光电技术有限公司 用于液晶显示设备的led背光源及液晶显示设备
CN105611665A (zh) * 2015-11-24 2016-05-25 芜湖锐芯电子科技有限公司 一种分流led电路
KR102507597B1 (ko) * 2016-05-27 2023-03-08 티씨엘 차이나 스타 옵토일렉트로닉스 테크놀로지 컴퍼니 리미티드 표시 장치
CN106455239B (zh) * 2016-12-01 2019-01-25 中山市恒能电子科技有限公司 一种定时降功率led灯电源
CN108682385B (zh) * 2018-07-26 2020-07-03 京东方科技集团股份有限公司 像素电路、像素驱动方法和显示装置
CN109639110B (zh) * 2018-12-20 2024-04-02 上海艾为电子技术股份有限公司 一种升压电路以及充电器
TWI683598B (zh) * 2019-04-17 2020-01-21 宏碁股份有限公司 發光模組及發光二極體驅動電路
TWI700963B (zh) * 2019-08-28 2020-08-01 群光電能科技股份有限公司 發光二極體控制裝置
CN110545030A (zh) * 2019-10-10 2019-12-06 上海源微电子科技有限公司 一种升压拓扑负载短路保护电路
CN111031633B (zh) * 2020-01-09 2021-09-24 Oppo广东移动通信有限公司 一种闪光灯驱动电路

Citations (4)

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Publication number Priority date Publication date Assignee Title
EP1919261A1 (fr) * 2006-10-30 2008-05-07 Alcatel Lucent Circuit de commande de courant constant de basse fréquence pour diodes électroluminescentes de haute puissance
CN101330203A (zh) * 2008-07-30 2008-12-24 电子科技大学 具有负载短路保护功能的电流沉恒流输出驱动电路
US20100194285A1 (en) * 2009-02-04 2010-08-05 Samsung Electronics Co., Ltd. Light source driving apparatus and light source apparatus having the same
CN101916550A (zh) * 2010-08-18 2010-12-15 福建捷联电子有限公司 发光二极管驱动电路

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CN100488012C (zh) * 2006-05-17 2009-05-13 友达光电股份有限公司 发光二极管驱动器的同步开关升压转换器
JP4621231B2 (ja) * 2007-06-29 2011-01-26 富士通テン株式会社 電源保護装置及び電子制御装置
DE102008025748A1 (de) * 2008-05-29 2009-12-03 Automotive Lighting Reutlingen Gmbh Elektrische Schaltungsanordnung
US8503139B2 (en) * 2010-02-05 2013-08-06 Monolithic Power Systems, Inc. High dimming ratio control and short circuit protection for LED drive with step up converter
CN102157919B (zh) * 2010-02-12 2015-06-17 硕颉科技股份有限公司 升压型电源转换装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1919261A1 (fr) * 2006-10-30 2008-05-07 Alcatel Lucent Circuit de commande de courant constant de basse fréquence pour diodes électroluminescentes de haute puissance
CN101330203A (zh) * 2008-07-30 2008-12-24 电子科技大学 具有负载短路保护功能的电流沉恒流输出驱动电路
US20100194285A1 (en) * 2009-02-04 2010-08-05 Samsung Electronics Co., Ltd. Light source driving apparatus and light source apparatus having the same
CN101916550A (zh) * 2010-08-18 2010-12-15 福建捷联电子有限公司 发光二极管驱动电路

Also Published As

Publication number Publication date
CN102496343A (zh) 2012-06-13
CN102496343B (zh) 2014-07-16

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