WO2012155550A1 - Led恒流驱动电路 - Google Patents

Led恒流驱动电路 Download PDF

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Publication number
WO2012155550A1
WO2012155550A1 PCT/CN2012/071060 CN2012071060W WO2012155550A1 WO 2012155550 A1 WO2012155550 A1 WO 2012155550A1 CN 2012071060 W CN2012071060 W CN 2012071060W WO 2012155550 A1 WO2012155550 A1 WO 2012155550A1
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Prior art keywords
transistor
diode
resistor
transformer
led
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PCT/CN2012/071060
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English (en)
French (fr)
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高源�
乔宇波
Original Assignee
Gao Yuan
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Application filed by Gao Yuan filed Critical Gao Yuan
Priority to US13/505,457 priority Critical patent/US8941319B2/en
Priority to CN201280000621.9A priority patent/CN103503572B/zh
Publication of WO2012155550A1 publication Critical patent/WO2012155550A1/zh
Priority to HK14101695.0A priority patent/HK1188670A1/zh

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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]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology

Definitions

  • the invention relates to an LED driving circuit, in particular to an LED constant current driving circuit.
  • LEDs are quickly used in various fields of life due to their long life, high luminous efficiency, no radiation and low power consumption.
  • the structural characteristics of the PN junction of the LED also have the characteristics of a diode (non-linear) and have a negative temperature coefficient. Therefore, the LED has put forward new requirements for the driving power source in use, requiring high stability and constant current characteristics.
  • the RC drive circuit has a sharp increase in current, low power factor and high harmonics when the voltage is high.
  • there are some special LED constant current driving chips in the market which have high stability and good constant current characteristics, but these special LED constant current driving chips have complex structure, high cost and high price.
  • the object of the present invention is to overcome the defects of the prior art and provide an LED constant current driving circuit with simple structure, reliable performance and low price.
  • the technical solution for realizing the invention is: including:
  • the BUCK circuit is composed of a transformer T1, a diode D9, a capacitor C5 and a field effect transistor Q1;
  • a voltage limiting circuit is formed by a resistor R1, a diode D8, a capacitor C1, a resistor R3, a transistor Q2, a Zener diode DZ1 and a diode D10;
  • a current limiting circuit is formed by a resistor R4, a triode Q3, a triode Q4, and a resistor R2;
  • the FET of the FET Q1 flows through the primary side of the transformer T1, flows through the LED load, and then flows through the FET Q1 and the resistor R2 back to the negative pole of the power supply.
  • the FET Q1 is disconnected, the current flows through the primary side of the transformer T1, and the LED
  • the load and diode D9 form a loop.
  • the technical solution further includes: a specific constant current driving circuit, wherein
  • the same name of the primary side of T1 terminates the positive pole of the power supply, the other end of the primary side of the transformer T1 is connected to the anode of the lED load, and the cathode of the lED load is connected to the anode of the diode D9 and the drain of the FET Q1, respectively.
  • the positive and negative poles respectively correspond to the anode and cathode of the lED load
  • the cathode of the diode D9 is connected to the anode of the power source
  • the same end of the secondary side of the transformer T1 is respectively connected to the anode of the diode D8 and one end of the capacitor C1, and the pair of the transformer T1.
  • the other end of the side is connected to the source of the FET Q1
  • the source of the FET Q1 is connected to the negative pole of the power supply through the resistor R2
  • the gate of the FET Q1 is connected to the other end of the capacitor C1 and the emitter of the transistor Q2.
  • the base of the pole and the transistor Q4, the emitter of the transistor Q4 is connected to the cathode of the power source
  • the collector of the transistor Q2 is connected to the cathode of the diode D8, one end of the resistor R1 and one end of the resistor R3, and the other end of the resistor R1 is connected.
  • the anode of the power supply, the base of the transistor Q2 is connected to the other end of the resistor R3, the anode of the diode D10 and the cathode of the Zener diode DZ1, and the anode of the Zener diode DZ1 is connected to the cathode of the power supply.
  • the triode Q3 is a PNP type triode, and the triode Q2 and the triode Q4 are NPN type triodes.
  • the field effect transistor Q1 is an enhancement type PMOS field effect transistor.
  • the lED load is composed of a plurality of light-emitting LEDs connected in series.
  • the LED of the constant current driving circuit of the invention has the same name of the primary side of the transformer connected to the positive pole of the power supply, the other end of the primary side of the transformer is connected to the anode of the lED load, and the cathode of the lED load is respectively connected to the anode of the diode D9 and the field effect transistor Q1.
  • the drain and the negative pole of the capacitor C5 are respectively connected to the anode and the cathode of the lED load, the cathode of the diode D9 is connected to the anode of the power source, and the same end of the secondary side of the transformer T1 is respectively connected to the anode of the diode D8 and one end of the capacitor C1, and the transformer T1
  • the other end of the secondary side is connected to the source of the FET Q1
  • the source of the FET Q1 is connected to the negative terminal of the power supply through the resistor R2, and the gate of the FET Q1 is connected to the other end of the capacitor C1 and the emitter of the transistor Q2.
  • the base of the transistor Q4, the emitter of the transistor Q4 is connected to the negative pole of the power supply
  • the collector of the transistor Q2 is connected to the cathode of the diode D8, one end of the resistor R1 and one end of the resistor R3, and the other end of the resistor R1 is connected.
  • the source of the positive electrode, respectively base of the transistor Q2 is connected to the other end of the resistor R3, the cathode of the diode D10 cathode and anode of Zener diode DZ1, the anode connected to the power source Zener diode DZ1.
  • the LED constant current driving circuit of the present invention limits the current flowing through the LED load by limiting the maximum current value of the inductor current of the transformer. Since the inductor current of the transformer cannot be abruptly changed, the linear variation of the inductor current of the transformer is finally realized to achieve constant
  • the purpose of the flow which constitutes a simple structure, reliable performance, low cost LED constant current drive circuit, is very suitable for the field of civil LED lighting.
  • FIG. 1 is a circuit schematic diagram of an LED constant current driving circuit of the present invention.
  • the LED constant current driving circuit of the present invention comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C5, a transformer T1, a diode D8, a diode D9, a diode D10, and a Zener diode DZ1.
  • Enhanced PMOS FET Q1, NPN transistor Q2, PNP transistor Q3 and NPN transistor Q4, the same name of the transformer T1 is terminated with the positive terminal of the power supply, and the other end of the transformer T1 is connected to the anode of the lED load (
  • the lED load may be composed of a plurality of illuminating LEDs connected in series or a single illuminating LED.
  • the cathode of the lED load is respectively connected to the anode of the diode D9 and the drain of the FET Q1, and the positive and negative poles of the capacitor C5 are respectively corresponding.
  • the source of Q1, the source of the FET Q1 is connected to the negative pole of the power supply through the resistor R2, and the gate of the FET Q1 is connected to the other end of the capacitor C1, the emitter of the transistor Q2, the cathode of the diode D10, and the resistor R4.
  • One end and the emitter of the transistor Q3, the base of the transistor Q3 is connected to the other end of the resistor R4 and the collector of the transistor Q4, and the collector of the transistor Q3 is connected to the source of the field effect transistor Q1 and the base of the transistor Q4, the transistor Q4
  • the emitter is connected to the negative pole of the power supply
  • the collector of the transistor Q2 is connected to the cathode of the diode D8, one end of the resistor R1 and one end of the resistor R3, the other end of the resistor R1 is connected to the anode of the power source, and the base of the transistor Q2 is respectively connected to the resistor R3.
  • the other end, the anode of the diode D10 and the cathode of the Zener diode DZ1, the anode of the Zener diode DZ1 is connected to the cathode of the power supply.
  • the transformer T1, the diode D9, the capacitor C5 and the field effect transistor Q1 constitute a BUCK (buck) circuit
  • the resistor R1, the diode D8, the capacitor C1, the resistor R3, the transistor Q2, the Zener diode DZ1 and the diode D10 constitute a voltage limiting circuit
  • the resistor R4, the transistor Q3, the transistor Q4, and the resistor R2 constitute a current limiting circuit.
  • the FET Q1 conduction current flows through the primary side of the transformer T1, flows through the LED load, and then flows through the FET Q1 and the resistor R2 back to the negative pole of the power supply.
  • the LED constant current driving circuit of the present invention always operates in a critical continuous current mode, and limits the current flowing through the LED load by limiting the maximum current value of the inductor current of the transformer. Since the inductor current of the transformer cannot be abruptly changed, the transformer is ultimately dependent. A linear change in the inductor current to achieve constant current.

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

Abstract

一种LED恒流驱动电路，包括：由变压器T1、二极管D9、电容C5和场效应管Q1构成BUCK电路；由电阻R1、二极管D8、电容C1、电阻R3、三极管Q2、稳压二极管DZ1和二极管D10构成限压电路；由电阻R4、三极管Q3、三极管Q4和电阻R2构成限流电路；其中：场效应管Q1导通电流流经变压器T1原边，流经LED负载，再流过场效应管Q1和电阻R2回到电源负极，场效应管Q1断开时候，电流流经变压器T1原边、LED负载、二极管D9形成回路。

Description

LED 恒流驱动电路
技术领域
本发明涉及一种LED驱动电路，尤其涉及一种LED恒流驱动电路。
背景技术
LED以其使用寿命长、光效高、无辐射与低功耗等特点很快在应用在生活的各个领域。但是LED的PN结的结构特点同样拥有二极管的特性（非线性），具有负温度系数。因此LED在使用时候对驱动电源提出了新的要求，要求稳定度高，具备恒流特性。阻容驱动电路作为一种常见的LED驱动电路，其在电压高的时候，电流会急剧加大、功率因数低、高次谐波多。目前市场还出现一些专用LED恒流驱动芯片，其稳定度高、恒流特性好，但这些专用LED恒流驱动芯片的结构复杂、成本较高、价格昂贵。
发明内容
本发明的目的就是为了克服现有技术存在的缺陷，提供一种结构简单、性能可靠、价格低廉的LED恒流驱动电路。
实现本发明的技术方案是：包括：
由变压器T1、二极管D9、电容C5和场效应管Q1构成BUCK电路；
由电阻R1、二极管D8、电容C1、电阻R3、三极管Q2、稳压二极管DZ1和二极管D10构成限压电路；
由电阻R4、三极管Q3、三极管Q4和电阻R2构成限流电路；其中
场效应管Q1导通电流流经变压器T1原边，流经LED负载，再流过场效应管Q1和电阻R2回到电源负极，场效应管Q1断开时候，电流流经变压器T1原边、LED负载、二极管D9形成回路。
该技术方案还包括：一具体恒流驱动电路，其中
电阻R1、电阻R2、电阻R3、电阻R4、电容C1、电容C5、变压器T1、二极管D8、二极管D9、二极管D10、稳压二极管DZ1、场效应管Q1、三极管Q2、三极管Q3和三极管Q4，变压器T1的原边的同名端接电源的正极，变压器T1的原边的另一端接lED负载的阳极，所述lED负载的阴极分别接二极管D9的阳极和场效应管Q1的漏极，电容C5的正、负极分别对应接所述lED负载的阳、阴极，二极管D9的阴极接所述电源的正极，变压器T1的副边的同名端分别接二极管D8的阳极和电容C1的一端，变压器T1的副边的另一端接场效应管Q1的源极，场效应管Q1的源极通过电阻R2接所述电源的负极，场效应管Q1的栅极分别接电容C1的另一端、三极管Q2的发射极、二极管D10的阴极、电阻R4的一端和三极管Q3的发射极，三极管Q3的基极分别接电阻R4的另一端和三极管Q4的集电极，三极管Q3的集电极分别接场效应管Q1的源极和三极管Q4的基极，三极管Q4的发射极接所述电源的负极，三极管Q2的集电极分别接二极管D8的阴极、电阻R1的一端和电阻R3的一端，电阻R1的另一端接所述电源的正极，三极管Q2的基极分别接电阻R3的另一端、二极管D10的阳极和稳压二极管DZ1的阴极，稳压二极管DZ1的阳极接所述电源的负极。
所述三极管Q3为PNP型三极管，三极管Q2和三极管Q4为NPN型三极管。
所述场效应管Q1为增强型PMOS场效应管。
所述lED负载由多个发光LED顺次串联构成。
本发明的LED恒流驱动电路的变压器的原边的同名端接电源的正极，变压器的原边的另一端接lED负载的阳极，lED负载的阴极分别接二极管D9的阳极和场效应管Q1的漏极，电容C5的正、负极分别对应接lED负载的阳、阴极，二极管D9的阴极接电源的正极，变压器T1的副边的同名端分别接二极管D8的阳极和电容C1的一端，变压器T1的副边的另一端接场效应管Q1的源极，场效应管Q1的源极通过电阻R2接电源的负极，场效应管Q1的栅极分别接电容C1的另一端、三极管Q2的发射极、二极管D10的阴极、电阻R4的一端和三极管Q3的发射极，三极管Q3的基极分别接电阻R4的另一端和三极管Q4的集电极，三极管Q3的集电极分别接场效应管Q1的源极和三极管Q4的基极，三极管Q4的发射极接电源的负极，三极管Q2的集电极分别接二极管D8的阴极、电阻R1的一端和电阻R3的一端，电阻R1的另一端接电源的正极，三极管Q2的基极分别接电阻R3的另一端、二极管D10的阳极和稳压二极管DZ1的阴极，稳压二极管DZ1的阳极接电源的负极。可见，本发明的LED恒流驱动电路通过限制变压器的电感电流的最大电流值来限制流过LED负载的电流，由于变压器的电感电流不能突变，所以最终依赖变压器的电感电流的线性变化来实现恒流的目的，从而构成了一个结构简单、性能可靠、价格低廉的LED恒流驱动电路，非常适用于民用LED照明领域。
附图说明
图1为本发明的LED恒流驱动电路的电路原理图。
具体实施方式
下面结合附图对本发明作进一步说明。
下面结合附图对本发明的具体实施方式进行详细描述：
参考图1所示，本发明的LED恒流驱动电路包括电阻R1、电阻R2、电阻R3、电阻R4、电容C1、电容C5、变压器T1、二极管D8、二极管D9、二极管D10、稳压二极管DZ1、增强型PMOS场效应管Q1、NPN型三极管Q2、PNP型三极管Q3和NPN型三极管Q4，变压器T1的原边的同名端接电源的正极，变压器T1的原边的另一端接lED负载的阳极（lED负载可以是由多个发光LED顺次串联构成，也可以是单个发光LED构成），lED负载的阴极分别接二极管D9的阳极和场效应管Q1的漏极，电容C5的正、负极分别对应接lED负载的阳、阴极，二极管D9的阴极接电源的正极，变压器T）的副边的同名端分别接二极管D8的阳极和电容C1的一端，变压器T1的副边的另一端接场效应管Q1的源极，场效应管Q1的源极通过电阻R2接电源的负极，场效应管Q1的栅极分别接电容C1的另一端、三极管Q2的发射极、二极管D10的阴极、电阻R4的一端和三极管Q3的发射极，三极管Q3的基极分别接电阻R4的另一端和三极管Q4的集电极，三极管Q3的集电极分别接场效应管Q1的源极和三极管Q4的基极，三极管Q4的发射极接电源的负极，三极管Q2的集电极分别接二极管D8的阴极、电阻R1的一端和电阻R3的一端，电阻R1的另一端接电源的正极，三极管Q2的基极分别接电阻R3的另一端、二极管D10的阳极和稳压二极管DZ1的阴极，稳压二极管DZ1的阳极接电源的负极。
其中，变压器T1、二极管D9、电容C5和场效应管Q1构成BUCK（降压）电路，电阻R1、二极管D8、电容C1、电阻R3、三极管Q2、稳压二极管DZ1和二极管D10构成限压电路，电阻R4、三极管Q3、三极管Q4和电阻R2构成限流电路。场效应管Q1导通电流流经变压器T1原边，流经LED负载，再流过场效应管Q1和电阻R2回到电源负极。场效应管Q1断开时候，电流流经变压器T1原边、LED负载、二极管D9等形成回路。因此，本发明的LED恒流驱动电路一直工作在临界连续电流模式，通过限制变压器的电感电流的最大电流值来限制流过LED负载的电流，由于变压器的电感电流不能突变，所以最终依赖变压器的电感电流的线性变化来实现恒流的目的。
以上的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通工程技术人员对本发明的技术方案作出的各种变形和改进，均应落入本发明的权利要求书确定的保护范围内。

Claims (5)

1、一种LED恒流驱动电路，其特征在于，包括：
由变压器T1、二极管D9、电容C5和场效应管Q1构成BUCK电路；
由电阻R1、二极管D8、电容C1、电阻R3、三极管Q2、稳压二极管DZ1和二极管D10构成限压电路；
由电阻R4、三极管Q3、三极管Q4和电阻R2构成限流电路；其中
场效应管Q1导通电流流经变压器T1原边，流经LED负载，再流过场效应管Q1和电阻R2回到电源负极，场效应管Q1断开时候，电流流经变压器T1原边、LED负载、二极管D9形成回路。
2、根据权利要求1所述的LED恒流驱动电路，其特征在于，还包括电阻R1、电阻R2、电阻R3、电阻R4、电容C1、电容C5、变压器T1、二极管D8、二极管D9、二极管D10、稳压二极管DZ1、场效应管Q1、三极管Q2、三极管Q3和三极管Q4，变压器T1的原边的同名端接电源的正极，变压器T1的原边的另一端接lED负载的阳极，所述lED负载的阴极分别接二极管D9的阳极和场效应管Q1的漏极，电容C5的正、负极分别对应接所述lED负载的阳、阴极，二极管D9的阴极接所述电源的正极，变压器T1的副边的同名端分别接二极管D8的阳极和电容C1的一端，变压器T1的副边的另一端接场效应管Q1的源极，场效应管Q1的源极通过电阻R2接所述电源的负极，场效应管Q1的栅极分别接电容C1的另一端、三极管Q2的发射极、二极管D10的阴极、电阻R4的一端和三极管Q3的发射极，三极管Q3的基极分别接电阻R4的另一端和三极管Q4的集电极，三极管Q3的集电极分别接场效应管Q1的源极和三极管Q4的基极，三极管Q4的发射极接所述电源的负极，三极管Q2的集电极分别接二极管D8的阴极、电阻R1的一端和电阻R3的一端，电阻R1的另一端接所述电源的正极，三极管Q2的基极分别接电阻R3的另一端、二极管D10的阳极和稳压二极管DZ1的阴极，稳压二极管DZ1的阳极接所述电源的负极。
3、根据权利要求2所述的LED恒流驱动电路，其特征在于，所述三极管Q3为PNP型三极管，三极管Q2和三极管Q4为NPN型三极管。
4、根据权利要求3所述的LED恒流驱动电路，其特征在于，所述场效应管Q1为增强型PMOS场效应管。
5、根据权利要求4所述的LED恒流驱动电路，其特征在于，所述lED负载由多个发光LED顺次串联构成。
PCT/CN2012/071060 2011-05-19 2012-02-13 Led恒流驱动电路 WO2012155550A1 (zh)

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HK14101695.0A HK1188670A1 (zh) 2011-05-19 2014-02-21 恒流驅動電路

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CN104754796A (zh) * 2013-12-26 2015-07-01 欧普照明股份有限公司 一种led恒流驱动电路
CN106961268A (zh) * 2017-03-17 2017-07-18 深圳市振邦智能科技股份有限公司 无功耗电阻启动电路

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CN103503572A (zh) 2014-01-08
CN103503572B (zh) 2015-05-06
US8941319B2 (en) 2015-01-27
US20140070715A1 (en) 2014-03-13
TW201301226A (zh) 2013-01-01
TWI446317B (zh) 2014-07-21

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