WO2015051739A1 - Circuit pilote de diodes électroluminescentes - Google Patents

Circuit pilote de diodes électroluminescentes Download PDF

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Publication number
WO2015051739A1
WO2015051739A1 PCT/CN2014/088157 CN2014088157W WO2015051739A1 WO 2015051739 A1 WO2015051739 A1 WO 2015051739A1 CN 2014088157 W CN2014088157 W CN 2014088157W WO 2015051739 A1 WO2015051739 A1 WO 2015051739A1
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WO
WIPO (PCT)
Prior art keywords
power supply
unit
load
led
supply unit
Prior art date
Application number
PCT/CN2014/088157
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English (en)
Chinese (zh)
Inventor
武俊
Original Assignee
欧普照明股份有限公司
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 欧普照明股份有限公司 filed Critical 欧普照明股份有限公司
Publication of WO2015051739A1 publication Critical patent/WO2015051739A1/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]
    • H05B45/30—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 invention relates to the field of lighting technology, in particular to an LED driver.
  • LED Semiconductor lighting
  • LED is a light source and display device for the third generation of semiconductor materials. It has the characteristics of low power consumption, long life, no pollution, rich color and strong controllability. It is a revolution in lighting source and light industry. With the development of LED, more and more LED lighting products are flooding into the market. The electronic drive part of the LED is an integral part of the LED lighting product.
  • the commonly used starting line adopts the method of directly connecting the resistor, and the adopting method is simple, but in an abnormal situation, the latter part enters the abnormal protection state or enters the shutdown state, but due to the starting device If there is no setting, it will start again after entering the shutdown state, so that it will enter the abnormal protection state again or enter the shutdown state, so that the line will start again and again, leaving hidden dangers to the line safety.
  • the output voltage is basically higher than the voltage required for the normal working load (LED).
  • LED normal working load
  • the input power is not cut off.
  • the drive line still has a voltage output and is higher than the voltage required by the normal LED load. At this time, when the user connects the LED load, the LED load is vulnerable to transient overload and fails.
  • the technical solution of the present invention provides an LED driver, comprising: a power supply unit, a power supply control unit, and a startup protection unit, wherein:
  • the power supply unit is configured to supply power to the load (501) when the LED driver is connected to the load (501);
  • the power supply control unit is connected to the power supply unit for controlling the switching element (201) in the power supply unit;
  • the boot protection unit is connected to the power supply control unit for enabling the power unit to be activated by the connection with the load (501).
  • the boot protection unit is composed of a unidirectional conduction element (401) and a starting resistor (402).
  • the first end of the unidirectional conduction element (401) is connected to the power supply unit, and the second end of the unidirectional conduction element (401) is connected to the first end of the starting resistor (402), and the first resistor (402) is activated.
  • the two ends are connected to the power supply control unit.
  • the power supply control unit may include a chip unit, one end of the chip unit is connected to the power supply unit, and the other end of the chip unit is connected to the startup protection unit.
  • the starting protection unit when the LED driver is connected to the load (501), the starting protection unit generates a starting current, and the switching element (201) receives the starting current for realizing the starting of the power supply unit.
  • the power supply unit includes a switching element (201), a conduction through element (301), a storage and release unit (302), and a load capacitive element (304), a unidirectional conduction element (301), and a load capacitive element (
  • the first ends of 304) are connected in common, and the energy storage unit (302) is respectively connected to the single-conducting element (301) and the second end of the load-capacitive element (304), and one end of the switching element (201) is unidirectionally connected.
  • the second end of the component (301) is connected.
  • the invention provides an LED driver, which can stop the LED driving when the LED load is not connected, and only when the LED driver has a connected LED load, the LED driver can be started to work, thereby solving the LED load in the LED driver.
  • the problem of failure of the live connection in the line which in turn makes the entire LED drive and LED load safer.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention
  • FIG. 2 is a schematic structural view of one embodiment of the present invention.
  • Figure 3 is a schematic structural view of the second embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a third embodiment of the present invention.
  • Fig. 5 is a schematic structural view of the fourth embodiment of the present invention.
  • the invention provides an LED driver, which can stop the LED driving when the LED load is not connected, and only when the LED driver has a connected LED load, the LED driver can be started to work, thereby solving the LED load in the LED driver.
  • the problem of failure of the live connection in the line which in turn makes the entire LED drive and LED load safer.
  • the LED driver can be used in a buck LED driving circuit, and the startup protection unit included in the LED driver includes a one-way conduction component and a starting resistor, and the startup resistor performs LED driving only when the LED driver is turned on and has an LED load.
  • the power supply unit supplies power; when the LED load is not properly connected, the switching elements of the power supply unit in the LED drive line will not be able to obtain the starting current, thereby providing a simple open circuit protection function, that is, if no LED load is connected, the start is performed.
  • the protection unit does not work, thus achieving the purpose of open circuit protection.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention
  • FIG. 2 is a schematic structural view of one embodiment of the present invention
  • An LED driver includes a power supply unit 1, a power supply control unit 2, and a startup protection unit 3, wherein:
  • the power supply unit is configured to supply power to the load 501 when the LED driver is connected to the load 501;
  • the power supply control unit is connected to the power supply unit for controlling the power supply unit Switching element; achieving switching off, amplification or saturation of the switching element.
  • the startup protection unit is connected to the power supply control unit to implement activation of the power supply unit through connection with the load 501.
  • BUCK structure is a schematic structural view of one embodiment of the present invention.
  • the start-up protection unit 3 is connected in series by a single-conducting element 401 and a start-up resistor 402. One end of the start-up protection unit 3 is connected to the power supply unit 1 and the LED load 501, respectively, and the other end is connected to the power supply control unit 2. Specifically, the first end of the unidirectional conduction element 401 is connected to the power supply unit, the second end of the unidirectional conduction element 401 is connected to the first end of the starting resistor 402, and the second end of the starting resistor 402 is connected to the power supply control unit.
  • the starting resistor 402 of the protection unit 3 is activated to supply power to the power supply unit 1 in the LED driving; in the case where the LED load 501 is not normally connected, the LED driving
  • the switching element 201 of the middle power supply unit 1 will not be able to obtain the starting current, thereby providing a simple open circuit protection function, that is, if no LED load 501 is connected to the LED driving, the starting protection unit 3 will not be activated, thereby achieving the purpose of open circuit protection. .
  • one end of the power supply unit 1 is connected to an input voltage, such as a DC input voltage, which may be a DC voltage or a DC ripple voltage after rectification.
  • the other end of the power supply unit 1 is connected to the first end of the activation protection unit 3.
  • the power supply unit 1 includes a switching element 201, a unidirectional conduction element 301, a storage energy unit 302, and a load capacitive element 304.
  • the first end of the unidirectional conduction element 301 and the load capacitive element 303 are commonly connected to one end of the DC input voltage.
  • the stored energy unit 302 is connected to the single-way element 301 and the second end of the load-capable element 304, respectively.
  • the first end including the switching element 201, the guiding element 301, the stored energy unit 302, and the load capacitive element 304, the unidirectional conductive element 301 and the load capacitive element 304 are commonly connected, and the storage and release unit 302 is respectively Connected to the second end of the unidirectional conduction element 301 and the load capacitive element 304, one end of the switching element 201 is connected to the second end of the unidirectional conduction element 301.
  • the power supply control unit 2 is connected to an input voltage, such as a DC input voltage, which may be a direct current. The voltage can also be a DC ripple voltage after rectification.
  • the other end of the power supply control unit 2 is connected to the second end of the activation protection unit 3.
  • the power supply control unit 2 includes a capacitive component 202, a resistive component 203, a secondary winding coil 303, and a unidirectional conductive component 207.
  • the capacitive component 202 and the resistive component 203 are sequentially connected in series, and the capacitive component 202 and the resistive component are sequentially connected.
  • One end of the 203 is connected to the secondary winding 303 of the storage unit 302 of the power supply unit 1, and the other end of the capacitive element 202 and the resistive element 203 is opposite to the base of the switching element 201 and the first end of the unidirectional element 207. Connected, the emitter of switching element 201 and the second end of unidirectional element 207 are grounded.
  • the start-up protection unit 3 is connected in series by a one-way conduction element 401 and a start-up resistor 402. One end of the open-circuit protection unit 3 is connected to the power supply unit 1 and the LED load 501, respectively, and the other end is connected to the power supply control unit 2.
  • the starting resistor 402 of the protection unit 3 is activated to perform power supply for the power supply control unit 2 in the LED driving; in the case where the LED load 501 is not connected normally, the switching of the power supply unit 1 in the LED driving
  • the component 201 will not be able to obtain the starting current, thereby providing a simple open circuit protection function, that is, if no LED load 501 is connected, the startup protection unit 3 will not work, thereby achieving the purpose of open circuit protection.
  • the startup protection unit When the LED driver is connected to the load (501), the startup protection unit generates a startup current, that is, when the switching element (201) receives the startup current for realizing the startup of the power supply unit.
  • the invention is applicable to use in discrete component control, or in most chip controlled LED drivers.
  • the activation of the LED power supply unit 1 needs to be initiated by the resistive component 402 in the protection unit 3, under normal conditions when the load 501 is connected:
  • the DC input voltage may be a direct current voltage, or may be a rectified DC ripple voltage
  • the resistor 402 and the switching element in the protection unit 3 are activated by the load 501 (which may be one or more) (may be The transistor or MOSFET 201 is discharged to generate a current to cause the switching element 201 to be turned on.
  • the switching element 201 is turned on, the DC voltage is discharged through the load capacitive element 304, the storage energy releasing unit 302 and the switching element 201, and the load capacitive element 304 starts to store energy.
  • the load capacitive element 304 supplies power to the LED load 501, and the secondary winding 303 of the stored energy unit 302 generates the same potential as the stored energy unit 302.
  • the electromotive force, the induced electromotive force is discharged by the capacitive element 202, the resistive element 203, and the base and the emitter of the switching element 201 to generate a current, causing the switching element 201 to enter a saturated conducting state while charging the capacitive element 202, along with The voltage across the capacitive element 202 increases, and the induced electromotive force drops through the capacitive element 202, the resistive element 203, and the base and emitter of the switching element 201. When the voltage across the capacitive element 202 rises to When the induced electromotive force is equal to, the switching element 201 exits the saturation conduction state.
  • state three the switching element 201 enters the saturation saturation state, the current flowing through the switching element decreases, the current of the storage energy unit 302 cannot be abruptly changed, and the reverse electromotive force is generated at both ends of the storage energy unit 302, and the electromotive force passes through a single guide.
  • the pass element 301 and the load capacitive element 304 are discharged while the load capacitive element 304 begins to store energy.
  • the load capacitive element 304 supplies power to the LED load 501 while
  • the secondary winding coil 303 of the stored energy unit 302 generates an induced electromotive force at the same potential as the stored energy unit 302, and the electromotive force is discharged through the unidirectional conduction element 207, the resistive element 203, and the capacitive element 202 to generate a reverse current.
  • the switching element 201 enters an off state while the capacitive element 202 is discharged and reversely charged.
  • state four when the electromotive force at both ends of the stored energy unit 302 is 0, the voltage across the secondary winding coil 303 of the stored energy unit 302 is also zero, and the capacitive element 202 begins to pass through the resistive element 203 and the switching element 201. The base and the radiation stage and the secondary winding 303 are discharged to generate a current, and the switching element 201 starts to conduct.
  • the switching element 201 of the power supply unit 1 cannot obtain the startup current, thereby functioning as an open circuit protection.
  • Figure 3 is a schematic structural view of the second embodiment of the present invention.
  • the BUCK-Boost structure although different from the buck structure in Figure 2, has the same:
  • the power supply unit 1, the power supply control unit 2 and the startup protection unit 3 are included, wherein:
  • the power supply unit is configured to supply power to the load 501 when the LED driver is connected to the load 501;
  • the power supply control unit is connected to the power supply unit for controlling a switching element in the power supply unit; and performing switching, amplification or saturation of the switching element.
  • the startup protection unit is connected to the power supply control unit to implement activation of the power supply unit through connection with the load 501.
  • a rectification filtering unit 4 may be included.
  • the LED power supply control unit 2 may include the illustrated structure.
  • the power supply control unit may include a chip unit, one end of the chip unit is connected to the power supply unit, and the other end of the chip unit is connected to the startup protection unit.
  • the LED driving in FIG. 4 and FIG. 5 when the LED driver is turned on and the LED load is turned on, the current flowing through the load is used to activate the protection unit 3, and the startup resistor 402 in the protection unit 3 is activated.
  • the LED-driven power supply unit 1 is powered.
  • the switching element 201 of the power supply unit 1 in the LED drive line will not be able to obtain the starting current, thereby providing a simple open circuit protection function, such as When no LED load is connected to 501, the protection unit 3 is activated, thereby achieving the purpose of open circuit protection.

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

Abstract

Cette invention concerne un circuit pilote de DEL, comprenant : une unité d'alimentation (1), une unité de commande d'alimentation (2) et une unité de protection d'activation (3). Ladite unité d'alimentation (1) alimente une charge (501) quand le circuit pilote de DEL est connecté à la charge (501). Ladite unité de commande d'alimentation (2) est connectée à l'unité d'alimentation (1) et elle commande un élément de commutation (201) de l'unité d'alimentation (1). Ladite unité de protection d'activation (3) est connectée à l'unité de commande d'alimentation (2) et elle active l'unité d'alimentation (1) par l'intermédiaire d'une connexion à la charge (501). Ledit circuit pilote de DEL ne peut être activé que lorsqu'il est connecté à la charge de DEL (501) de façon à résoudre le problème d'un défaut de connexion électrique de la charge de DEL (501) dans le circuit pilote de DEL, ce qui permet d'améliorer la sécurité du circuit pilote de DEL et de la charge de DEL (501) dans l'ensemble.
PCT/CN2014/088157 2013-10-12 2014-10-09 Circuit pilote de diodes électroluminescentes WO2015051739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310473844.3A CN104582058A (zh) 2013-10-12 2013-10-12 一种led驱动
CN201310473844.3 2013-10-12

Publications (1)

Publication Number Publication Date
WO2015051739A1 true WO2015051739A1 (fr) 2015-04-16

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WO (1) WO2015051739A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110351919A (zh) * 2018-04-04 2019-10-18 通用电气照明解决方案有限公司 用于led的驱动器及led系统
CN115268325B (zh) * 2022-07-27 2023-09-05 广达创芯电子技术(杭州)有限公司 双pmos的负载保护警报电路

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US7550934B1 (en) * 2008-04-02 2009-06-23 Micrel, Inc. LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response
US20090251837A1 (en) * 2008-04-03 2009-10-08 Fiebrich Greg R System and Method for Information Handling System Display Backlight Protection and Monitoring
CN201360368Y (zh) * 2009-02-23 2009-12-09 杭州海康蓝博电器有限公司 一种太阳能led驱动器
CN102105010A (zh) * 2011-03-25 2011-06-22 上海新进半导体制造有限公司 一种led驱动电路
CN102523650A (zh) * 2011-12-02 2012-06-27 赵修平 一种led电流检测和控制电路
CN102573182A (zh) * 2010-12-22 2012-07-11 海洋王照明科技股份有限公司 一种驱动保护电路及灯具
CN202713705U (zh) * 2012-06-12 2013-01-30 芯巧科技股份有限公司 发光二极管的升降压混合型驱动电路
CN202958028U (zh) * 2012-11-30 2013-05-29 宁波来和圣诞礼品有限公司 一种太阳能led灯串驱动电路
CN103298182A (zh) * 2012-02-24 2013-09-11 海洋王照明科技股份有限公司 Led旁路保护电路及led灯
CN203504840U (zh) * 2013-10-12 2014-03-26 欧普照明股份有限公司 一种led驱动

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7550934B1 (en) * 2008-04-02 2009-06-23 Micrel, Inc. LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response
US20090251837A1 (en) * 2008-04-03 2009-10-08 Fiebrich Greg R System and Method for Information Handling System Display Backlight Protection and Monitoring
CN201360368Y (zh) * 2009-02-23 2009-12-09 杭州海康蓝博电器有限公司 一种太阳能led驱动器
CN102573182A (zh) * 2010-12-22 2012-07-11 海洋王照明科技股份有限公司 一种驱动保护电路及灯具
CN102105010A (zh) * 2011-03-25 2011-06-22 上海新进半导体制造有限公司 一种led驱动电路
CN102523650A (zh) * 2011-12-02 2012-06-27 赵修平 一种led电流检测和控制电路
CN103298182A (zh) * 2012-02-24 2013-09-11 海洋王照明科技股份有限公司 Led旁路保护电路及led灯
CN202713705U (zh) * 2012-06-12 2013-01-30 芯巧科技股份有限公司 发光二极管的升降压混合型驱动电路
CN202958028U (zh) * 2012-11-30 2013-05-29 宁波来和圣诞礼品有限公司 一种太阳能led灯串驱动电路
CN203504840U (zh) * 2013-10-12 2014-03-26 欧普照明股份有限公司 一种led驱动

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