WO2012167411A1 - Dimming circuit for high-power led lamp - Google Patents

Dimming circuit for high-power led lamp Download PDF

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Publication number
WO2012167411A1
WO2012167411A1 PCT/CN2011/001619 CN2011001619W WO2012167411A1 WO 2012167411 A1 WO2012167411 A1 WO 2012167411A1 CN 2011001619 W CN2011001619 W CN 2011001619W WO 2012167411 A1 WO2012167411 A1 WO 2012167411A1
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WO
WIPO (PCT)
Prior art keywords
constant current
led
triode
led lamp
feedback resistor
Prior art date
Application number
PCT/CN2011/001619
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French (fr)
Chinese (zh)
Inventor
董建国
俞剑锋
林万炯
Original Assignee
宁波赛尔富电子有限公司
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Publication of WO2012167411A1 publication Critical patent/WO2012167411A1/en

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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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 a high power LED lamp dimming circuit. Background technique
  • the current LED driver power supply has a constant voltage type driving power supply (such as 12V or 24V output voltage). This type of power supply can be used in constant voltage LED lamps, generally low power LED lamps. It is possible to use a resistor for current limiting; there is also a constant current type LED driving power supply, which is generally used to drive constant current type high power LED lamps. For constant voltage LED luminaires, pulse modulation (PWM) dimming technology can be used directly.
  • PWM pulse modulation
  • the technical problem to be solved by the present invention is to provide a high-power LED lamp dimming circuit for the above prior art, which can solve the dimming problem of high-power LED lamps and solve the problems of reliability and electromagnetic compatibility.
  • the high-power LED lamp dimming circuit is configured to perform pulse modulation dimming on the LED lighting circuit
  • the LED lighting circuit comprises a plurality of serially connected LED lamps, a triode and a feedback resistor, wherein an anode of the first LED lamp of the plurality of serially connected LED lamps is connected to an anode of an external constant current power source, and a cathode of the last LED lamp of the plurality of serially connected LED lamps and a collector of the triode Connected, the emitter of the triode is connected to the first end of the feedback resistor, and the second end of the feedback resistor is connected to the negative pole of the external constant current source, wherein the LED dimming circuit comprises a constant current controller and a linear adjustment tube.
  • the base of the linear adjustment tube is connected to the external pulse width modulation signal output end, and the collector of the linear adjustment tube is connected to the output pin of the constant current controller, and the base of the triode is also connected with the output pin of the constant current controller. Connected, the first end of the feedback resistor and the constant current confirmation The feedback input pin of the controller is connected.
  • the invention has the advantages that: by adding a constant current controller and a linear adjusting tube in the circuit, the output end of the constant current controller is used as a feedback reference source for adjusting the V of the triode in the LED lighting circuit.
  • the CE voltage ensures that the voltage across the feedback resistor is constant, ensuring that the current flowing through the LED's LED does not exceed the output of the constant current controller divided by the feedback resistor.
  • the pulse modulation signal is applied to the linear adjustment tube, and the dimming function of the LED light emitting diode can be completed; the solution can solve the shortcoming that the constant current driving power source cannot perform PWM dimming.
  • FIG. 1 is a circuit diagram of a high power LED lamp dimming circuit in an embodiment of the present invention. detailed description
  • the high-power LED lamp dimming circuit includes a constant current controller N1 of type AL8400 and a linear adjustment tube Q2, a resistor R1, a base of the linear adjustment tube Q2 and an external pulse width modulation signal output end.
  • the PWM is connected, and the collector of the linear adjustment tube Q2 is connected to the output pin of the constant current controller N1;
  • the LED lighting circuit comprises a plurality of LED lamps connected in series, a transistor Q1 and a feedback resistor R2, and the plurality of LEDs connected in series
  • the anode of the first LED lamp D1 in the lamp is connected to the positive pole of the external constant current power source, and the cathode of the last LED lamp Dn among the plurality of serially connected LED lamps is connected to the collector of the transistor Q1, and the emitter of the transistor Q1 is
  • the first end of the feedback resistor R2 is connected, and the second end of the feedback resistor R2 is connected to the negative terminal of the external constant current power supply; the base of the transistor Q1 is also connected
  • the VCE voltage of the transistor Q1 with the output of the AL8400 is always 0.2V, thus ensuring the flow.
  • the current of the LED lamp does not exceed 0.2V/R2 at the maximum.
  • the PWM signal is applied to the linear adjustment tube Q2, and the dimming function of the LED lamp Dl-Dn can be completed.

Abstract

A dimming circuit for high-power LED lamp is used for dimming and modulating pulse of LED illumination circuit. The LED illumination circuit includes many LED lamps in series, triode and feedback resistor. The anode of the first LED lamp of the LED lamps in series is connected with the positive electrode of the external constant current power. The cathode of the last LED lamp is connected with the collector of the triode. The emitter of the triode is connected with the first end of the feedback resistor. The second end of the feedback is connected with the negative electrode of the external constant current power. The circuit has linear adjustment tube whose base is connected with an externally connected pulse width modulation signal output end. The collector of the linear adjustment tube is connected with an output pin of the constant current controller. The base of the triode is connected with the output pin of the constant current controller. The second end of the feedback resistor is connected with the feedback input pin of the constant current controller. Comparing with the prior art, pulse width modulation (PWM) can be implemented in the constant current driving power supply.

Description

一种大功率 LED灯调光电路  High-power LED lamp dimming circuit
技术领域 Technical field
本发明涉及一种大功率 LED灯调光电路。 背景技术  The invention relates to a high power LED lamp dimming circuit. Background technique
随着 LED的亮度不断的提升， 从原先的不到 201m/W提高到目前将近 1301m/W的 水平， 大家对于 LED灯具的调光需求日益迫切。 目前的 LED驱动电源中有恒压型驱动 电源（如输出电压为 12V或者是 24V)， 该类电源可以用于恒压性 LED灯具中， 一般为 小功率 LED灯具。 可以用电阻来进行限流即可； 还有恒流型 LED驱动电源， 一般用于 驱动恒流型大功率 LED灯具。对于恒压型 LED灯具可以直接用脉冲调制 (PWM)调光技 术。 但是对于恒流型 LED灯具， 如果直接用 PWM调光技术就会遇到 LED驱动电源的 负载调整率无法满足 PWM的控制频率的要求， 使得在调光的过程中无法将电流调制低 占空比的情况， 同时输出电流的均值无法减小， 还会出现高的尖峰电流。 会对 LED造 成不可逆转的破坏。 目前对于这类调光大多通过后级 DC/DC来完成， 一般的 DC/DC会 有调光（DIMMER)端口， 该方案存在如下几个缺点： 一、成本高， 但是可靠性低。 二、 会对系统的电磁兼容 （EMC) 产生不利的影响， 为了解决 EMC的问题需要加入额外的 EMC滤波线路。 发明内容  As the brightness of LEDs continues to increase, from the original less than 201m/W to the current level of nearly 1301m/W, there is an increasing demand for dimming of LED lamps. The current LED driver power supply has a constant voltage type driving power supply (such as 12V or 24V output voltage). This type of power supply can be used in constant voltage LED lamps, generally low power LED lamps. It is possible to use a resistor for current limiting; there is also a constant current type LED driving power supply, which is generally used to drive constant current type high power LED lamps. For constant voltage LED luminaires, pulse modulation (PWM) dimming technology can be used directly. However, for constant current type LED lamps, if the PWM dimming technology is directly used, the load regulation rate of the LED driving power supply cannot meet the requirements of the PWM control frequency, so that the current cannot be modulated in the process of dimming. In the case, the average value of the output current cannot be reduced, and a high peak current occurs. It can cause irreversible damage to LEDs. At present, most of the dimming is done by the rear stage DC/DC. The general DC/DC has a dimming (DIMMER) port. The solution has the following disadvantages: 1. High cost, but low reliability. Second, it will have an adverse effect on the electromagnetic compatibility (EMC) of the system. In order to solve the EMC problem, additional EMC filter lines need to be added. Summary of the invention
本发明所要解决的技术问题是针对上述现有技术提供一种大功率 LED灯调光电路， 该电路能解决大功率 LED灯具的调光问题， 同时为了解决可靠性和电磁兼容方面的问 题。  The technical problem to be solved by the present invention is to provide a high-power LED lamp dimming circuit for the above prior art, which can solve the dimming problem of high-power LED lamps and solve the problems of reliability and electromagnetic compatibility.
本发明解决上述技术问题所采用的技术方案为： 该大功率 LED灯调光电路， 用于 对 LED发光电路进行脉冲调制调光， 所述 LED发光电路包括多颗串接的 LED灯、 三 极管和反馈电阻， 所述多颗串接的 LED灯中第一颗 LED灯的阳极与外接恒流电源正极 相连， 所述多颗串接的 LED灯中最后一颗 LED灯的阴极与三极管的集电极相连， 三极 管的发射极与反馈电阻的第一端相连， 反馈电阻的第二端与外接恒流电源负极相连， 其 特征在于： 所述 LED调光电路包括一恒流控制器和线性调整管， 线性调整管的基极与 外接的脉宽调制信号输出端相连， 线性调整管的集电极与恒流控制器的输出引脚相连， 所述三极管的基极也与恒流控制器的输出引脚相连，所述反馈电阻的第一端与所述恒流 确 认 本 控制器的反馈输入引脚相连。 The technical solution adopted by the present invention to solve the above technical problem is: the high-power LED lamp dimming circuit is configured to perform pulse modulation dimming on the LED lighting circuit, and the LED lighting circuit comprises a plurality of serially connected LED lamps, a triode and a feedback resistor, wherein an anode of the first LED lamp of the plurality of serially connected LED lamps is connected to an anode of an external constant current power source, and a cathode of the last LED lamp of the plurality of serially connected LED lamps and a collector of the triode Connected, the emitter of the triode is connected to the first end of the feedback resistor, and the second end of the feedback resistor is connected to the negative pole of the external constant current source, wherein the LED dimming circuit comprises a constant current controller and a linear adjustment tube. The base of the linear adjustment tube is connected to the external pulse width modulation signal output end, and the collector of the linear adjustment tube is connected to the output pin of the constant current controller, and the base of the triode is also connected with the output pin of the constant current controller. Connected, the first end of the feedback resistor and the constant current confirmation The feedback input pin of the controller is connected.
与现有技术相比， 本发明的优点在于： 通过在电路中添加一恒流控制器和线性调 整管， 恒流控制器的输出端作为反馈基准源， 用于调节 LED发光电路中三极管的 VCE 电压， 确保反馈电阻上的电压恒定， 进而确保流过 LED发光二极管的电流最大不会超 过恒流控制器的输出端除以反馈电阻阻值。 此时将脉冲调制信号加于线性调整管， 就能 完^对 LED发光二极管发的调光功能;本方案可以解决恒流驱动电源不能进行 PWM调 光的缺点。 附图说明 Compared with the prior art, the invention has the advantages that: by adding a constant current controller and a linear adjusting tube in the circuit, the output end of the constant current controller is used as a feedback reference source for adjusting the V of the triode in the LED lighting circuit. The CE voltage ensures that the voltage across the feedback resistor is constant, ensuring that the current flowing through the LED's LED does not exceed the output of the constant current controller divided by the feedback resistor. At this time, the pulse modulation signal is applied to the linear adjustment tube, and the dimming function of the LED light emitting diode can be completed; the solution can solve the shortcoming that the constant current driving power source cannot perform PWM dimming. DRAWINGS
图 1为本发明实施例中大功率 LED灯调光电路的电路图。 具体实施方式  1 is a circuit diagram of a high power LED lamp dimming circuit in an embodiment of the present invention. detailed description
以下结合附图实施例对本发明作进一步详细描述。  The present invention will be further described in detail below with reference to the accompanying drawings.
如图 1所示， 该大功率 LED灯调光电路， 包括型号为 AL8400的恒流控制器 N1和 线性调整管 Q2、 电阻 Rl， 线性调整管 Q2的基极与外接的脉宽调制信号输出端 PWM 相连， 线性调整管 Q2的集电极与恒流控制器 N1的输出引脚相连； 其中 LED发光电路 包括多颗串接的 LED灯、 三极管 Q1和反馈电阻 R2， 所述多颗串接的 LED灯中第一颗 LED灯 D1的阳极与外接恒流电源正极相连， 所述多颗串接的 LED灯中最后一颗 LED 灯 Dn的阴极与三极管 Q1的集电极相连， 三极管 Q1的发射极与反馈电阻 R2的第一端 相连， 反馈电阻 R2的第二端与外接恒流电源负极相连； 三极管 Q1 的基极也与恒流控 制器 N1的输出引脚 OUT相连， 反馈电阻 R2的第一端与恒流控制器 N1的反馈输入引 脚 FB相连， 电阻 R1的第一端与外接恒流电源正极相连， 电阻 R1的第二端与恒流控制 器 N1的输出引脚 OUT相连。 电容 C1和电容 C2为外围元件。 本实施例中， 线性调整 管 Q2也为一三极管。  As shown in Figure 1, the high-power LED lamp dimming circuit includes a constant current controller N1 of type AL8400 and a linear adjustment tube Q2, a resistor R1, a base of the linear adjustment tube Q2 and an external pulse width modulation signal output end. The PWM is connected, and the collector of the linear adjustment tube Q2 is connected to the output pin of the constant current controller N1; wherein the LED lighting circuit comprises a plurality of LED lamps connected in series, a transistor Q1 and a feedback resistor R2, and the plurality of LEDs connected in series The anode of the first LED lamp D1 in the lamp is connected to the positive pole of the external constant current power source, and the cathode of the last LED lamp Dn among the plurality of serially connected LED lamps is connected to the collector of the transistor Q1, and the emitter of the transistor Q1 is The first end of the feedback resistor R2 is connected, and the second end of the feedback resistor R2 is connected to the negative terminal of the external constant current power supply; the base of the transistor Q1 is also connected to the output pin OUT of the constant current controller N1, and the first end of the feedback resistor R2 The first end of the resistor R1 is connected to the positive terminal of the external constant current power supply, and the second end of the resistor R1 is connected to the output pin OUT of the constant current controller N1. Capacitor C1 and capacitor C2 are peripheral components. In this embodiment, the linear adjustment tube Q2 is also a triode.
利用型号为 AL8400的恒流控制器 N1 的反馈引脚输出的 0.2V电压作为反馈基准 源， 用 AL8400的输出调节三极管 Q1的 VCE电压， 确保反馈电阻 R2上的电压始终为 0.2V, 进而确保流过 LED灯的电流最大不会超过 0.2V/R2, 此时将 PWM信号加于线性 调整管 Q2， 就能完成对 LED灯 Dl-Dn的调光功能了。  Using the 0.2V voltage of the feedback pin output of the constant current controller N1 of the AL8400 as the feedback reference source, adjust the VCE voltage of the transistor Q1 with the output of the AL8400 to ensure that the voltage on the feedback resistor R2 is always 0.2V, thus ensuring the flow. The current of the LED lamp does not exceed 0.2V/R2 at the maximum. At this time, the PWM signal is applied to the linear adjustment tube Q2, and the dimming function of the LED lamp Dl-Dn can be completed.

Claims

权 利 要 求 Rights request
1、 一种大功率 LED灯调光电路， 用于对 LED发光电路进行脉冲调制调光， 所述 LED发光电路包括多颗串接的 LED灯、 三极管 (Q1)和反馈电阻 (R2)， 所述多颗串接的 LED灯中第一颗 LED灯的阳极与外接恒流电源正极相连，所述多颗串接的 LED灯中最 后一颗 LED灯的阴极与三极管 (Q1)的集电极相连，三极管 (Q1)的发射极与反馈电阻 (R2) 的第一端相连，反馈电阻 (R2)的第二端与外接恒流电源负极相连，其特征在于：所述 LED 调光电路包括一恒流控制器 (Nl)和线性调整管 (Q2)， 线性调整管 (Q2)的基极与外接的脉 宽调制信号输出端相连， 线性调整管 (Q2)的集电极与恒流控制器 (N1)的输出引脚相连， 所述三极管 (Q1)的基极也与恒流控制器 (N1)的输出引脚相连， 所述反馈电阻 (R2)的第一 端与所述恒流控制器 (N1)的反馈输入引脚相连。  1. A high-power LED lamp dimming circuit for performing pulse modulation dimming on an LED lighting circuit, wherein the LED lighting circuit comprises a plurality of serially connected LED lamps, a triode (Q1) and a feedback resistor (R2). The anode of the first LED lamp of the plurality of serially connected LED lamps is connected to the positive pole of the external constant current power source, and the cathode of the last LED lamp of the plurality of serially connected LED lamps is connected to the collector of the triode (Q1) The emitter of the triode (Q1) is connected to the first end of the feedback resistor (R2), and the second end of the feedback resistor (R2) is connected to the negative terminal of the external constant current source, wherein the LED dimming circuit comprises a constant The flow controller (Nl) and the linear adjustment tube (Q2), the base of the linear adjustment tube (Q2) is connected to the external pulse width modulation signal output terminal, and the collector of the linear adjustment tube (Q2) and the constant current controller (N1) The output pin of the transistor is connected, the base of the transistor (Q1) is also connected to the output pin of the constant current controller (N1), and the first end of the feedback resistor (R2) is connected to the constant current controller ( The feedback input pin of N1) is connected.
PCT/CN2011/001619 2011-06-10 2011-09-26 Dimming circuit for high-power led lamp WO2012167411A1 (en)

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CN2011101579446A CN102170735A (en) 2011-06-10 2011-06-10 Dimming circuit of high-power LED (Light-emitting Diode) lamp

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