WO2017107146A1 - Led drive circuit - Google Patents

Led drive circuit Download PDF

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Publication number
WO2017107146A1
WO2017107146A1 PCT/CN2015/098754 CN2015098754W WO2017107146A1 WO 2017107146 A1 WO2017107146 A1 WO 2017107146A1 CN 2015098754 W CN2015098754 W CN 2015098754W WO 2017107146 A1 WO2017107146 A1 WO 2017107146A1
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WO
WIPO (PCT)
Prior art keywords
module
resistor
power
output
led
Prior art date
Application number
PCT/CN2015/098754
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French (fr)
Chinese (zh)
Inventor
黄鹤鸣
许国伟
Original Assignee
深圳市聚作照明股份有限公司
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 深圳市聚作照明股份有限公司 filed Critical 深圳市聚作照明股份有限公司
Priority to PCT/CN2015/098754 priority Critical patent/WO2017107146A1/en
Priority to CN201590000102.1U priority patent/CN206212329U/en
Publication of WO2017107146A1 publication Critical patent/WO2017107146A1/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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present application relates to LED driving technology, and more particularly to an LED driving circuit.
  • LED fluorescent lamp holders are usually equipped with at least one LED lamp.
  • the traditional driving method is to drive one lamp per lamp. When one lamp is not lit, other lamps work as usual, and this driving method is costly.
  • the purpose of the present application is to provide an LED driving circuit, which is intended to have a large number of lamps and a high cost.
  • An LED driving circuit capable of driving a plurality of LED lamps, including a power conversion loop for connecting an alternating current and for adjusting an alternating current current, and an AC-DC module for alternating current to direct current, and including for converting the power to the power a loop providing a power supply IC module with an adjustable control signal and a plurality of detection control modules for detecting whether the LED light is connected;
  • an AC input terminal of the AC-DC module is connected to an output end of the power conversion loop, and a DC output end of the AC-DC module is connected to a positive pole of each of the LED lamps; each of the detecting The input end of the control module is connected to the corresponding negative pole of the LED lamp, and the output end is connected to the feedback end of the power IC module; the output end of the power IC module is connected to the controlled end of the power conversion loop;
  • the module 13 adjusts the size of the control signal outputted to the power conversion loop according to the detection control module detecting the access state of the LED lamp, so that the power conversion loop adjusts the input of the AC input end of the AC-DC module. Current size.
  • the detection control module includes a first bypass transistor, a second bypass transistor, a photocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth a resistor and a seventh resistor, wherein:
  • control end of the first bypass tube is connected to the negative pole of the LED lamp through the first resistor, the first The output end of the switch is grounded, and passes through the second resistor to the negative pole of the LED lamp, and the input end of the first switch transistor is connected to the output end of the light source of the photocoupler, the optocoupler The input end of the light source is connected to the DC output end of the AC-DC module through the third resistor;
  • the output end of the photocoupler of the photocoupler is grounded, the input end of the photocoupler of the photocoupler is connected to the control end of the second bypass tube, and the working power supply is connected through the fourth resistor.
  • the output end of the second bypass tube is grounded, the input end of the second bypass tube is connected to one end of the fifth resistor, and the second end of the fifth resistor is used as an output end of the detection control module.
  • the first bypass pipe and the second bypass pipe are NPN type transistors, and the input end, the output end, and the control end of the first bypass pipe and the second bypass pipe are respectively NPN type The collector, emitter, and base of the transistor.
  • the power IC module includes a driving power chip, a sixth resistor, and a seventh resistor, wherein the power source of the driving power chip is connected to the working power source, and the feedback power of the driving power chip is used as a Power supply I
  • the feedback terminal of the C module is connected to the output end of the detection control module, and the output pin of the driving power chip is connected to the output end of the power conversion circuit as the controlled end of the power conversion circuit; One end is connected to the working power supply, and the other end is connected to the output end of the detection control module, and grounded through the seventh resistor.
  • the AC-DC module includes a transformer, a rectifier and a filter capacitor, a primary coil of the transformer is connected to an output end of the power conversion loop, and one end of the rectifier is connected to a secondary coil of the transformer. One end is connected, the other end of the secondary coil of the transformer is grounded, and the other end of the rectifier is grounded through the filter capacitor and serves as a DC output end of the AC-DC module.
  • the rectifier is a rectifier diode
  • an anode of the rectifier diode is connected to one end of the secondary coil of the transformer
  • a cathode is connected to the filter capacitor
  • the LED driving circuit detects whether there is an LED lamp access by using the detection control module, and inputs the detection signal to the power IC module, and the power IC module adjusts the duty ratio of the control signal according to the detection signal so that the power conversion circuit adjusts the AC.
  • the input current of the AC input terminal of the DC module that is, the power supply adjustment of the LED lamp is realized, and one driving power source with multiple LED lights is realized, which realizes power adaptation and saves cost.
  • FIG. 1 is a circuit schematic diagram of an LED driving circuit in a preferred embodiment of the present application.
  • an LED driving circuit in a preferred embodiment of the present application can drive a plurality of LED lamps 10 , including a power conversion loop 11 , an AC-DC module 12 , a power IC module 13 , and a plurality of detection control modules 14 . .
  • the power conversion circuit 11 is connected to an alternating current power source (not shown) and used to adjust the magnitude of the alternating current; the AC-DC module 12 is configured to convert the alternating current power into direct current to power the LED lamp 10; the detection control module 14 is configured to detect Whether the LED lamp 10 is connected, and the detection result is fed back to the power IC module 13; the power IC module 13 is configured to provide an adjustable control signal to the power conversion circuit 11 according to the detection result.
  • the AC input terminal of the AC-DC module 12 is connected to the output end of the power conversion circuit 11, and the DC output terminal LED+ of the AC-DC module 12 is connected to the positive pole of each LED lamp 10; the input terminal of each detection control module 14 is connected.
  • the output terminal of each detection control module 14 is connected to the feedback end of the power supply IC module 13; the output end of the power supply IC module 13 is connected to the control end of the power conversion circuit 11; the power supply IC module 13 is controlled according to the detection.
  • the module 14 detects the access state of the LED lamp 10 to adjust the magnitude of the control signal output to the power conversion loop 11 to cause the power conversion loop 11 to adjust the magnitude of the input current of the AC input terminal of the AC-DC module 12.
  • the power IC module 13 adjusts the size of the control signal according to the detection result of the detection control module 14, and the power conversion circuit 11 adjusts the input current of the AC input terminal of the AC-DC module 12 under the control of the control signal to adjust the DC output LED+. Voltage and current.
  • the power conversion loop 11 can be implemented by the prior art, which regulates the input AC power supply circuit by the access control signal and outputs it to the AC-DC module 12.
  • the AC-DC module 12 includes a transformer T1, a rectifier D1, and a filter capacitor C1.
  • the primary coil of the transformer T1 is connected to the output end of the power conversion circuit 11, and the end of the rectifier D1 terminal and the secondary coil of the transformer T1. Connected, the other end of the secondary winding of the transformer T1 is grounded, and the other end of the rectifier D1 is grounded through the filter capacitor C1 and serves as the DC output terminal LED+ of the AC-DC module 12.
  • the rectifier D1 is a rectifier diode, and the anode of the rectifier diode is connected to one end of the secondary coil of the transformer T1, and the cathode is connected to the filter capacitor Cl.
  • the detection control module 14 includes a first bypass transistor Q1, a second bypass transistor Q2, a photocoupler ⁇ 1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor. R5.
  • the control end of the first switch Q1 is connected to the negative pole of the LED lamp 10 through the first resistor R1, the output end of the first switch Q1 is grounded, and passes through the second resistor R2, the negative pole of the LED lamp 10, first
  • the input end of the switch Q1 is connected to the output end of the light source of the optocoupler OP1, and the input end of the light source of the optocoupler OP1 is connected to the DC output terminal LED+ of the AC-DC module 12 through the third resistor R3.
  • the output end of the photocoupler of the optocoupler OP 1 is grounded, the input end of the photoreceiver OP1 is connected to the control end of the second switch Q2, and the fourth resistor R4 is connected to the working power supply VCC, second The output end of the switch Q2 is grounded, the input end of the second switch Q2 is connected to one end of the fifth resistor R5, and the second end of the fifth resistor R5 is used as the output end of the detection control module 14.
  • the first bypass tube Q1 and the second bypass tube Q2 are NPN type transistors, and the input end, the output end and the control end of the first bypass tube Q1 and the second bypass tube Q2 are respectively NPN type The collector, emitter, and base of the transistor.
  • the power IC module 13 includes a driving power chip U1, a sixth resistor R6, and a seventh resistor R7.
  • the power supply pin I6 of the driving power chip U1 is connected to the working power source VCC, and the feedback pin I of the driving power chip U1 is used as a power source.
  • the feedback terminal of the IC module 13 is connected to the output end of the detection control module 14.
  • the output pin 8 of the driving power chip U1 is used as the output end of the power IC module 13 to be connected to the control end of the power conversion circuit 11; one end of the sixth resistor R6 is connected to the working power supply. VCC, the other end is connected to the output of the detection control module 14, and is grounded through the seventh resistor R7.
  • the driving power supply chip U1 is an ordinary driving power supply chip, and an existing chip having the above functions can be employed.
  • the driving power chip U1 is a PWM control chip, and the control signal outputted from the output pin 8 is a PWM signal with adjustable duty ratio, or a current signal of adjustable magnitude.
  • the driving power chip U1 is energized, and the current passes through the rectifier D1, the positive pole of the LED lamp 10, the negative pole of the LED lamp 10, and the second resistor R2 to the ground.
  • the current generates a voltage of 0.7V on the second resistor R2, and the voltage of 0.7V is
  • the first resistor R1 is applied between the bases of the first bypass tube Q1, the collector and the emitter of the first bypass transistor Q1 are turned on, the light source of the photocoupler OP1 is powered to emit light, and the photocoupler of the photocoupler OP1 When turned on, the base voltage of the second bypass transistor Q2 disappears.
  • the second switch Q2 is turned off, and the fifth resistor R5 is turned off.
  • the driving power chip U1 is a power IC with an analog dimming function, and the voltage of the feedback pin I pin 7 determines the duty ratio or current of the PWM signal output from the output pin 8.
  • the voltage at the feedback pin 7 of the driving power chip U1 (R7/R5) I (R6+R7/R5).
  • the first switch Q1 is turned off, the photocoupler OP1 has no operating current, and the second switch Q2 is turned on.
  • the fifth resistor R5 is connected in parallel with the seventh resistor R7 through the emitter ground of the second bypass transistor Q2.
  • the feedback pin 7 of the driving power chip U1 becomes lower, the output pin 8 output control signal becomes lower, and the AC current regulated by the power conversion circuit 11 becomes smaller, and the DC output LED+ output current decreases.
  • Other LED lights 10 work the same way.
  • the LED driving circuit detects whether or not the LED lamp 10 is connected by using the detection control module 14, and inputs the detection signal to the power supply IC module 13, and the power supply IC module 13 adjusts the duty ratio of the control signal according to the detection signal to make the power
  • the conversion circuit 11 adjusts the input current of the AC input terminal of the AC-DC module 12, that is, realizes the power supply adjustment of the LED lamp 10, realizes one driving power source with multiple LED lamps 10, realizes power adaptation, and saves cost.
  • the cost is reduced by about 30%.

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

Abstract

An LED drive circuit capable of driving a plurality of LED lamps (10), the circuit comprising a power conversion return loop (11), an AC-DC module (12), a power supply IC module (13), and a plurality of detection control modules (14). The power conversion return loop (11) accesses the alternating current power supply to adjust the magnitude of the alternating current power; the AC-DC module (12) is used for converting the alternating current into a direct current; the detection control modules (14) are used for detecting whether the LED lamps (10) are accessed, and feeding back the detection results to the power supply IC module (13); the power supply IC module (13) is used for providing an adjustable control signal to the power conversion return loop (11) on the basis of the detection results, such that the power conversion return loop (11) regulates the magnitude of the input current of the alternating current input terminal of the AC-DC module (12). One drive power supply thereby drives a plurality of LED lamps, implementing power self-adaption and saving costs.

Description

一种 LED驱动电路 技术领域  LED driving circuit
[0001] 本申请涉及 LED驱动技术， 特别是涉及一种 LED驱动电路。  [0001] The present application relates to LED driving technology, and more particularly to an LED driving circuit.
背景技术  Background technique
[0002] LED日光灯盘支架， 通常配至少一个 LED灯， 传统驱动方法是每 1个灯配 1个驱 动。 当 1个灯不亮吋， 其它灯具照常工作， 这种驱动方法， 成本较高。  [0002] LED fluorescent lamp holders are usually equipped with at least one LED lamp. The traditional driving method is to drive one lamp per lamp. When one lamp is not lit, other lamps work as usual, and this driving method is costly.
技术问题  technical problem
[0003] 本申请目的在于提供一种 LED驱动电路， 旨在目前多 LED灯的灯具驱动多， 成 本高的问题。  [0003] The purpose of the present application is to provide an LED driving circuit, which is intended to have a large number of lamps and a high cost.
问题的解决方案  Problem solution
技术解决方案  Technical solution
[0004] 一种 LED驱动电路， 可驱动多个 LED灯， 包括接入交流并用于调节交流电流大 小的功率转换回路和用于交流转直流的 AC-DC模块， 还包括用于向该功率转换 回路提供可调控制信号的电源 IC模块和多个用于检测所述 LED灯是否接入的检测 控制模块；  [0004] An LED driving circuit capable of driving a plurality of LED lamps, including a power conversion loop for connecting an alternating current and for adjusting an alternating current current, and an AC-DC module for alternating current to direct current, and including for converting the power to the power a loop providing a power supply IC module with an adjustable control signal and a plurality of detection control modules for detecting whether the LED light is connected;
[0005] 其中， 所述 AC-DC模块的交流输入端接所述功率转换回路的输出端， 所述 AC- DC模块的直流输出端接每个所述 LED灯的正极； 每个所述检测控制模块的输入 端接相应的所述 LED灯的负极， 输出端接所述电源 IC模块的反馈端； 所述电源 IC 模块的输出端接所述功率转换回路的受控端； 所述电源 IC模块 13根据所述检测 控制模块检测所述 LED灯的接入状态调节输出到所述功率转换回路的控制信号的 大小， 以使所述功率转换回路调节所述 AC-DC模块的交流输入端的输入电流大 小。  [0005] wherein an AC input terminal of the AC-DC module is connected to an output end of the power conversion loop, and a DC output end of the AC-DC module is connected to a positive pole of each of the LED lamps; each of the detecting The input end of the control module is connected to the corresponding negative pole of the LED lamp, and the output end is connected to the feedback end of the power IC module; the output end of the power IC module is connected to the controlled end of the power conversion loop; The module 13 adjusts the size of the control signal outputted to the power conversion loop according to the detection control module detecting the access state of the LED lamp, so that the power conversion loop adjusts the input of the AC input end of the AC-DC module. Current size.
[0006] 优选地， 所述检测控制模块包括第一幵关管、 第二幵关管、 光电耦合器、 第一 电阻、 第二电阻、 第三电阻、 第四电阻、 第五电阻、 第六电阻及第七电阻， 其 中：  [0006] Preferably, the detection control module includes a first bypass transistor, a second bypass transistor, a photocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth a resistor and a seventh resistor, wherein:
[0007] 所述第一幵关管的控制端通过所述第一电阻接所述 LED灯的负极， 所述第一幵 关管的输出端接地， 并通过所述第二电阻所述 LED灯的负极， 所述第一幵关管的 输入端接所述光电耦合器的发光源的输出端， 所述光电耦合器的发光源的输入 端接通过所述第三电阻接所述 AC-DC模块的直流输出端； [0007] the control end of the first bypass tube is connected to the negative pole of the LED lamp through the first resistor, the first The output end of the switch is grounded, and passes through the second resistor to the negative pole of the LED lamp, and the input end of the first switch transistor is connected to the output end of the light source of the photocoupler, the optocoupler The input end of the light source is connected to the DC output end of the AC-DC module through the third resistor;
[0008] 所述光电耦合器的受光器的输出端接地， 所述光电耦合器的受光器的输入端接 所述第二幵关管的控制端， 还通过所述第四电阻接工作电源， 所述第二幵关管 的输出端接地， 所述第二幵关管的输入端接所述第五电阻的一端， 所述第五电 阻的第二端作为所述检测控制模块的输出端。 [0008] The output end of the photocoupler of the photocoupler is grounded, the input end of the photocoupler of the photocoupler is connected to the control end of the second bypass tube, and the working power supply is connected through the fourth resistor. The output end of the second bypass tube is grounded, the input end of the second bypass tube is connected to one end of the fifth resistor, and the second end of the fifth resistor is used as an output end of the detection control module.
[0009] 优选地， 所述第一幵关管和第二幵关管为 NPN型三极管， 所述第一幵关管和第 二幵关管的输入端、 输出端、 控制端分别为 NPN型三极管的集电极、 发射极、 基极。 [0009] Preferably, the first bypass pipe and the second bypass pipe are NPN type transistors, and the input end, the output end, and the control end of the first bypass pipe and the second bypass pipe are respectively NPN type The collector, emitter, and base of the transistor.
[0010] 优选地， 所述电源 IC模块包括驱动电源芯片、 第六电阻和第七电阻， 所述驱动 电源芯片的电源弓 I脚接工作电源， 所述驱动电源芯片的反馈弓 I脚作为所述电源 I [0010] Preferably, the power IC module includes a driving power chip, a sixth resistor, and a seventh resistor, wherein the power source of the driving power chip is connected to the working power source, and the feedback power of the driving power chip is used as a Power supply I
C模块的反馈端接所述检测控制模块的输出端， 所述驱动电源芯片的输出引脚作 为所述电源 IC模块的输出端接所述功率转换回路的受控端； 所述第六电阻的一 端接工作电源， 另一端接所述检测控制模块的输出端， 并通过所述第七电阻接 地。 The feedback terminal of the C module is connected to the output end of the detection control module, and the output pin of the driving power chip is connected to the output end of the power conversion circuit as the controlled end of the power conversion circuit; One end is connected to the working power supply, and the other end is connected to the output end of the detection control module, and grounded through the seventh resistor.
[0011] 优选地， 所述 AC-DC模块包括变压器、 整流器及滤波电容， 所述变压器的初级 线圈与所述功率转换回路的输出端连接， 所述整流器一端与所述变压器的次级 线圈的一端连接， 所述变压器的次级线圈的另一端接地， 所述整流器另一端通 过所述滤波电容接地， 并作为所述 AC-DC模块的直流输出端。  [0011] Preferably, the AC-DC module includes a transformer, a rectifier and a filter capacitor, a primary coil of the transformer is connected to an output end of the power conversion loop, and one end of the rectifier is connected to a secondary coil of the transformer. One end is connected, the other end of the secondary coil of the transformer is grounded, and the other end of the rectifier is grounded through the filter capacitor and serves as a DC output end of the AC-DC module.
[0012] 优选地， 所述整流器为整流二极管， 该整流二极管的阳极接所述变压器的次级 线圈的一端， 阴极接所述滤波电容。 [0012] Preferably, the rectifier is a rectifier diode, an anode of the rectifier diode is connected to one end of the secondary coil of the transformer, and a cathode is connected to the filter capacitor.
发明的有益效果  Advantageous effects of the invention
有益效果  Beneficial effect
[0013] 上述 LED驱动电路通过利用检测控制模块检测是否有 LED灯接入， 并将检测信 号输入到电源 IC模块， 电源 IC模块根据检测信号调节其控制信号的占空比使得 功率转换回路调节 AC-DC模块的交流输入端的输入电流大小， 即实现 LED灯的 供电电源调节， 实现 1个驱动电源带多个 LED灯， 实现功率自适应， 节省了成本 对附图的简要说明 [0013] The LED driving circuit detects whether there is an LED lamp access by using the detection control module, and inputs the detection signal to the power IC module, and the power IC module adjusts the duty ratio of the control signal according to the detection signal so that the power conversion circuit adjusts the AC. - The input current of the AC input terminal of the DC module, that is, the power supply adjustment of the LED lamp is realized, and one driving power source with multiple LED lights is realized, which realizes power adaptation and saves cost. Brief description of the drawing
附图说明  DRAWINGS
[0014] 图 1为本申请较佳实施例中 LED驱动电路的电路原理图。  1 is a circuit schematic diagram of an LED driving circuit in a preferred embodiment of the present application.
本发明的实施方式 Embodiments of the invention
[0015] 为了使本申请要解决的技术问题、 技术方案及有益效果更加清楚明白， 以下结 合附图及实施例， 对本申请进行进一步详细说明。 应当理解， 此处所描述的具 体实施例仅仅用以解释本申请， 并不用于限定本申请。  [0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.
[0016] 请参阅图 1， 本申请较佳实施例中的 LED驱动电路可驱动多个 LED灯 10， 包括 功率转换回路 11、 AC-DC模块 12、 电源 IC模块 13及多个检测控制模块 14。  Referring to FIG. 1 , an LED driving circuit in a preferred embodiment of the present application can drive a plurality of LED lamps 10 , including a power conversion loop 11 , an AC-DC module 12 , a power IC module 13 , and a plurality of detection control modules 14 . .
[0017] 功率转换回路 11接入交流电源 （未示出） ， 并用于调节交流电流大小； AC-DC 模块 12用于将交流电源转换成直流电给 LED灯 10供电； 检测控制模块 14用于检测 LED灯 10是否接入， 并将检测结果反馈到电源 IC模块 13; 电源 IC模块 13用于根据 检测结果向功率转换回路 11提供可调控制信号。  [0017] The power conversion circuit 11 is connected to an alternating current power source (not shown) and used to adjust the magnitude of the alternating current; the AC-DC module 12 is configured to convert the alternating current power into direct current to power the LED lamp 10; the detection control module 14 is configured to detect Whether the LED lamp 10 is connected, and the detection result is fed back to the power IC module 13; the power IC module 13 is configured to provide an adjustable control signal to the power conversion circuit 11 according to the detection result.
[0018] AC-DC模块 12的交流输入端接功率转换回路 11的输出端， AC-DC模块 12的直流 输出端 LED+接每个 LED灯 10的正极； 每个检测控制模块 14的输入端接相应的 LE D灯 10的负极， 每个检测控制模块 14的输出端接电源 IC模块 13的反馈端； 电源 IC 模块 13的输出端接功率转换回路 11的控制端； 电源 IC模块 13根据检测控制模块 1 4检测 LED灯 10的接入状态调节输出到功率转换回路 11的控制信号的大小， 以使 功率转换回路 11调节 AC-DC模块 12的交流输入端的输入电流大小。 电源 IC模块 1 3根据检测控制模块 14的检测结果调节控制信号的大小， 功率转换回路 11在控制 信号的控制下调节 AC-DC模块 12的交流输入端的输入电流大小以实现调节直流 输出端 LED+的电压电流。  [0018] The AC input terminal of the AC-DC module 12 is connected to the output end of the power conversion circuit 11, and the DC output terminal LED+ of the AC-DC module 12 is connected to the positive pole of each LED lamp 10; the input terminal of each detection control module 14 is connected. The output terminal of each detection control module 14 is connected to the feedback end of the power supply IC module 13; the output end of the power supply IC module 13 is connected to the control end of the power conversion circuit 11; the power supply IC module 13 is controlled according to the detection. The module 14 detects the access state of the LED lamp 10 to adjust the magnitude of the control signal output to the power conversion loop 11 to cause the power conversion loop 11 to adjust the magnitude of the input current of the AC input terminal of the AC-DC module 12. The power IC module 13 adjusts the size of the control signal according to the detection result of the detection control module 14, and the power conversion circuit 11 adjusts the input current of the AC input terminal of the AC-DC module 12 under the control of the control signal to adjust the DC output LED+. Voltage and current.
[0019] 功率转换回路 11可用现有技术实现， 其通过接入控制信号调节输入的交流电源 的电路后在输出到 AC-DC模块 12。  [0019] The power conversion loop 11 can be implemented by the prior art, which regulates the input AC power supply circuit by the access control signal and outputs it to the AC-DC module 12.
[0020] AC-DC模块 12包括变压器 Tl、 整流器 D1及滤波电容 C1， 变压器 T1的初级线圈 与功率转换回路 11的输出端连接， 整流器 D1—端与变压器 T1的次级线圈的一端 连接， 变压器 Tl的次级线圈的另一端接地， 整流器 D1另一端通过滤波电容 C1接 地， 并作为 AC-DC模块 12的直流输出端 LED+。 [0020] The AC-DC module 12 includes a transformer T1, a rectifier D1, and a filter capacitor C1. The primary coil of the transformer T1 is connected to the output end of the power conversion circuit 11, and the end of the rectifier D1 terminal and the secondary coil of the transformer T1. Connected, the other end of the secondary winding of the transformer T1 is grounded, and the other end of the rectifier D1 is grounded through the filter capacitor C1 and serves as the DC output terminal LED+ of the AC-DC module 12.
[0021] 整流器 D1为整流二极管， 该整流二极管的阳极接变压器 T1的次级线圈的一端 ， 阴极接滤波电容 Cl。 [0021] The rectifier D1 is a rectifier diode, and the anode of the rectifier diode is connected to one end of the secondary coil of the transformer T1, and the cathode is connected to the filter capacitor Cl.
[0022] 检测控制模块 14包括第一幵关管 Ql、 第二幵关管 Q2、 光电耦合器 ΟΡ1、 第一电 阻 Rl、 第二电阻 R2、 第三电阻 R3、 第四电阻 R4及第五电阻 R5。  [0022] The detection control module 14 includes a first bypass transistor Q1, a second bypass transistor Q2, a photocoupler ΟΡ1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor. R5.
[0023] 第一幵关管 Q1的控制端通过第一电阻 R1接 LED灯 10的负极， 第一幵关管 Q1的 输出端接地， 并通过第二电阻 R2、 LED灯 10的负极， 第一幵关管 Q1的输入端接 光电耦合器 OP1的发光源的输出端， 光电耦合器 OP1的发光源的输入端接通过第 三电阻 R3接 AC-DC模块 12的直流输出端 LED+。  [0023] The control end of the first switch Q1 is connected to the negative pole of the LED lamp 10 through the first resistor R1, the output end of the first switch Q1 is grounded, and passes through the second resistor R2, the negative pole of the LED lamp 10, first The input end of the switch Q1 is connected to the output end of the light source of the optocoupler OP1, and the input end of the light source of the optocoupler OP1 is connected to the DC output terminal LED+ of the AC-DC module 12 through the third resistor R3.
[0024] 光电耦合器 OP 1的受光器的输出端接地， 光电耦合器 OP1的受光器的输入端接 第二幵关管 Q2的控制端， 还通过第四电阻 R4接工作电源 VCC， 第二幵关管 Q2的 输出端接地， 第二幵关管 Q2的输入端接第五电阻 R5的一端， 第五电阻 R5的第二 端作为检测控制模块 14的输出端。  [0024] The output end of the photocoupler of the optocoupler OP 1 is grounded, the input end of the photoreceiver OP1 is connected to the control end of the second switch Q2, and the fourth resistor R4 is connected to the working power supply VCC, second The output end of the switch Q2 is grounded, the input end of the second switch Q2 is connected to one end of the fifth resistor R5, and the second end of the fifth resistor R5 is used as the output end of the detection control module 14.
[0025] 优选地， 第一幵关管 Q1和第二幵关管 Q2为 NPN型三极管， 第一幵关管 Q1和第 二幵关管 Q2的输入端、 输出端、 控制端分别为 NPN型三极管的集电极、 发射极 、 基极。  [0025] Preferably, the first bypass tube Q1 and the second bypass tube Q2 are NPN type transistors, and the input end, the output end and the control end of the first bypass tube Q1 and the second bypass tube Q2 are respectively NPN type The collector, emitter, and base of the transistor.
[0026] 电源 IC模块 13包括驱动电源芯片 Ul、 第六电阻 R6和第七电阻 R7， 驱动电源芯 片 U1的电源弓 I脚 6接工作电源 VCC， 驱动电源芯片 U1的反馈弓 I脚 7作为电源 IC模 块 13的反馈端接检测控制模块 14的输出端， 驱动电源芯片 U1的输出引脚 8作为电 源 IC模块 13的输出端接功率转换回路 11的控制端； 第六电阻 R6的一端接工作电 源 VCC， 另一端接检测控制模块 14的输出端， 并通过第七电阻 R7接地。 驱动电 源芯片 U1为普通的驱动电源芯片， 可采用具有上述功能的现有芯片。 驱动电源 芯片 U1为 PWM控制芯片， 其输出引脚 8输出的控制信号是可调节占空比的 PWM 信号， 或者是可调节大小的电流信号。  [0026] The power IC module 13 includes a driving power chip U1, a sixth resistor R6, and a seventh resistor R7. The power supply pin I6 of the driving power chip U1 is connected to the working power source VCC, and the feedback pin I of the driving power chip U1 is used as a power source. The feedback terminal of the IC module 13 is connected to the output end of the detection control module 14. The output pin 8 of the driving power chip U1 is used as the output end of the power IC module 13 to be connected to the control end of the power conversion circuit 11; one end of the sixth resistor R6 is connected to the working power supply. VCC, the other end is connected to the output of the detection control module 14, and is grounded through the seventh resistor R7. The driving power supply chip U1 is an ordinary driving power supply chip, and an existing chip having the above functions can be employed. The driving power chip U1 is a PWM control chip, and the control signal outputted from the output pin 8 is a PWM signal with adjustable duty ratio, or a current signal of adjustable magnitude.
[0027] 以其中一个 LED灯 10的工作过程说明 LED驱动电路的工作原理： [0027] The operation of one of the LED lamps 10 illustrates the operation of the LED driver circuit:
[0028] 驱动电源芯片 U1通电工作吋， 电流经过整流器 Dl、 LED灯 10正极、 LED灯 10 负极、 第二电阻 R2到地。 电流在第二电阻 R2上产生一个 0.7V电压， 0.7V电压经 第一电阻 Rl加在第一幵关管 Ql的基极之间， 第一幵关管 Q1的集电极和发射极导 通， 光电耦合器 0P1的发光源通电发光， 光电耦合器 0P1的受光器导通， 第二幵 关管 Q2的基极电压消失。 第二幵关管 Q2截止， 第五电阻 R5断路。 第七电阻 R7两 端电压上升， 输出电流增加， 则接入驱动电源芯片 U1反馈引脚 7的电压上升。 使 驱动电源芯片 U1输出的控制信号增大， 功率转换回路 11调节的交流电流增大， 则直流输出端 LED+输出电流增加。 驱动电源芯片 U1是具有模拟调光功能的电源 IC， 反馈弓 I脚 7脚电压决定了输出引脚 8输出的 PWM信号的占空比或电流大小。 驱动电源芯片 U1的反馈引脚 7的电压 = (R7/R5) I (R6+R7/R5) 。 [0028] The driving power chip U1 is energized, and the current passes through the rectifier D1, the positive pole of the LED lamp 10, the negative pole of the LED lamp 10, and the second resistor R2 to the ground. The current generates a voltage of 0.7V on the second resistor R2, and the voltage of 0.7V is The first resistor R1 is applied between the bases of the first bypass tube Q1, the collector and the emitter of the first bypass transistor Q1 are turned on, the light source of the photocoupler OP1 is powered to emit light, and the photocoupler of the photocoupler OP1 When turned on, the base voltage of the second bypass transistor Q2 disappears. The second switch Q2 is turned off, and the fifth resistor R5 is turned off. When the voltage across the seventh resistor R7 rises and the output current increases, the voltage connected to the feedback pin 7 of the driving power supply chip U1 rises. When the control signal output from the driving power chip U1 is increased, and the AC current regulated by the power conversion circuit 11 is increased, the DC output terminal LED + output current is increased. The driving power chip U1 is a power IC with an analog dimming function, and the voltage of the feedback pin I pin 7 determines the duty ratio or current of the PWM signal output from the output pin 8. The voltage at the feedback pin 7 of the driving power chip U1 = (R7/R5) I (R6+R7/R5).
[0029] 反之， 当 LED灯 10取掉吋， 第一幵关管 Q1截止， 光电耦合器 OP1没有工作电流 ， 第二幵关管 Q2导通。 第五电阻 R5通过第二幵关管 Q2的发射极接地与第七电阻 R7并联。 驱动电源芯片 U1的反馈引脚 7电压变低， 输出引脚 8输出控制信号变低 ， 功率转换回路 11调节的交流电流变小， 则直流输出端 LED+输出电流降低。 其 他 LED灯 10的工作原理相同。  [0029] On the contrary, when the LED lamp 10 is removed, the first switch Q1 is turned off, the photocoupler OP1 has no operating current, and the second switch Q2 is turned on. The fifth resistor R5 is connected in parallel with the seventh resistor R7 through the emitter ground of the second bypass transistor Q2. The feedback pin 7 of the driving power chip U1 becomes lower, the output pin 8 output control signal becomes lower, and the AC current regulated by the power conversion circuit 11 becomes smaller, and the DC output LED+ output current decreases. Other LED lights 10 work the same way.
[0030] 上述 LED驱动电路通过利用检测控制模块 14检测是否有 LED灯 10接入， 并将检 测信号输入到电源 IC模块 13， 电源 IC模块 13根据检测信号调节其控制信号的占 空比使得功率转换回路 11调节 AC-DC模块 12的交流输入端的输入电流大小， 即 实现 LED灯 10的供电电源调节， 实现 1个驱动电源带多个 LED灯 10， 实现功率自 适应， 节省了成本。 在 LED支架灯管照明， 具有非常广泛的市场， 较现在支架多 灯方案， 成本降 30%左右。  [0030] The LED driving circuit detects whether or not the LED lamp 10 is connected by using the detection control module 14, and inputs the detection signal to the power supply IC module 13, and the power supply IC module 13 adjusts the duty ratio of the control signal according to the detection signal to make the power The conversion circuit 11 adjusts the input current of the AC input terminal of the AC-DC module 12, that is, realizes the power supply adjustment of the LED lamp 10, realizes one driving power source with multiple LED lamps 10, realizes power adaptation, and saves cost. In the LED bracket lamp lighting, there is a very wide market, compared with the current multi-lamp solution, the cost is reduced by about 30%.
[0031] 以上仅所述为本申请的较佳实施例而已， 并不用以限制本申请， 凡在本申请的 精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本申请的保 护范围之内。  The above is only the preferred embodiment of the present application, and is not intended to limit the application, and any modifications, equivalents, and improvements made within the spirit and principles of the present application should be included in the present disclosure. Within the scope of protection of the application.

Claims

权利要求书 Claim
[权利要求 1] 一种 LED驱动电路， 可驱动多个 LED灯， 包括接入交流并用于调节交 流电流大小的功率转换回路和用于交流转直流的 AC-DC模块， 其特 征在于， 还包括用于向该功率转换回路提供可调控制信号的电源 IC模 块和多个用于检测所述 LED灯是否接入的检测控制模块；  [Claim 1] An LED driving circuit capable of driving a plurality of LED lamps, including a power conversion loop for connecting an alternating current and for adjusting an alternating current current, and an AC-DC module for alternating current to direct current, characterized in that it further includes a power IC module for providing an adjustable control signal to the power conversion loop and a plurality of detection control modules for detecting whether the LED lamp is connected;
其中， 所述 AC-DC模块的交流输入端接所述功率转换回路的输出端 ， 所述 AC-DC模块的直流输出端接每个所述 LED灯的正极； 每个所述 检测控制模块的输入端接相应的所述 LED灯的负极， 输出端接所述电 源 IC模块的反馈端； 所述电源 IC模块的输出端接所述功率转换回路的 受控端； 所述电源 IC模块 13根据所述检测控制模块检测所述 LED灯的 接入状态调节输出到所述功率转换回路的控制信号的大小， 以使所述 功率转换回路调节所述 AC-DC模块的交流输入端的输入电流大小。  The AC input terminal of the AC-DC module is connected to the output end of the power conversion circuit, and the DC output end of the AC-DC module is connected to the positive pole of each of the LED lamps; The input terminal is connected to the corresponding negative pole of the LED lamp, and the output terminal is connected to the feedback end of the power IC module; the output end of the power IC module is connected to the controlled end of the power conversion circuit; The detection control module detects an access state of the LED lamp to adjust a size of a control signal outputted to the power conversion loop, so that the power conversion loop adjusts an input current magnitude of an AC input terminal of the AC-DC module.
[权利要求 2] 如权利要求 1所述的 LED驱动电路， 其特征在于， 所述检测控制模块 包括第一幵关管、 第二幵关管、 光电耦合器、 第一电阻、 第二电阻、 第三电阻、 第四电阻及第五电阻， 其中：  The LED driving circuit of claim 1 , wherein the detection control module comprises a first bypass transistor, a second bypass transistor, a photocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor, wherein:
所述第一幵关管的控制端通过所述第一电阻接所述 LED灯的负极， 所 述第一幵关管的输出端接地， 并通过所述第二电阻所述 LED灯的负极 ， 所述第一幵关管的输入端接所述光电耦合器的发光源的输出端， 所 述光电耦合器的发光源的输入端接通过所述第三电阻接所述 AC-DC 模块的直流输出端；  The control end of the first bypass tube is connected to the negative pole of the LED lamp through the first resistor, the output end of the first bypass tube is grounded, and the second resistor is used to pass the negative pole of the LED lamp. An input end of the first bypass tube is connected to an output end of the light source of the photocoupler, and an input end of the light source of the photocoupler is connected to the DC of the AC-DC module through the third resistor Output
所述光电耦合器的受光器的输出端接地， 所述光电耦合器的受光器的 输入端接所述第二幵关管的控制端， 还通过所述第四电阻接工作电源 ， 所述第二幵关管的输出端接地， 所述第二幵关管的输入端接所述第 五电阻的一端， 所述第五电阻的第二端作为所述检测控制模块的输出 山  An output end of the photocoupler of the photocoupler is grounded, an input end of the photocoupler of the photocoupler is connected to a control end of the second bypass tube, and a working power supply is connected through the fourth resistor, The output end of the second switch is grounded, the input end of the second switch is connected to one end of the fifth resistor, and the second end of the fifth resistor is used as the output mountain of the detection control module
[权利要求 3] 如权利要求 2所述的 LED驱动电路， 其特征在于， 所述第一幵关管和 第二幵关管为 NPN型三极管， 所述第一幵关管和第二幵关管的输入端 、 输出端、 控制端分别为 NPN型三极管的集电极、 发射极、 基极。 [Claim 3] The LED driving circuit according to claim 2, wherein the first bypass pipe and the second bypass pipe are NPN type transistors, the first bypass pipe and the second bypass pipe The input, output and control terminals of the tube are respectively the collector, emitter and base of the NPN transistor.
[权利要求 4] 如权利要求 1或 2所述的 LED驱动电路， 其特征在于， 所述电源 IC模块 包括驱动电源芯片、 第六电阻和第七电阻， 所述驱动电源芯片的电源 弓 I脚接工作电源， 所述驱动电源芯片的反馈弓 I脚作为所述电源 IC模块 的反馈端接所述检测控制模块的输出端， 所述驱动电源芯片的输出引 脚作为所述电源 IC模块的输出端接所述功率转换回路的受控端； 所述 第六电阻的一端接工作电源， 另一端接所述检测控制模块的输出端， 并通过所述第七电阻接地。 [Claim 4] The LED driving circuit according to claim 1 or 2, wherein the power IC module includes a driving power chip, a sixth resistor, and a seventh resistor, and the power source of the driving power chip Connected to the working power supply, the feedback pin of the driving power chip is used as a feedback end of the power IC module to be connected to the output end of the detecting control module, and an output pin of the driving power chip is used as an output of the power IC module Terminating the controlled end of the power conversion loop; one end of the sixth resistor is connected to the working power supply, and the other end is connected to the output end of the detection control module, and is grounded through the seventh resistor.
[权利要求 5] 如权利要求 1或 2所述的 LED驱动电路， 其特征在于， 所述 AC-DC模块 包括变压器、 整流器及滤波电容， 所述变压器的初级线圈与所述功率 转换回路的输出端连接， 所述整流器一端与所述变压器的次级线圈的 一端连接， 所述变压器的次级线圈的另一端接地， 所述整流器另一端 通过所述滤波电容接地， 并作为所述 AC-DC模块的直流输出端。  [Claim 5] The LED driving circuit according to claim 1 or 2, wherein the AC-DC module includes a transformer, a rectifier, and a filter capacitor, and an output of the primary coil of the transformer and the power conversion loop End connection, one end of the rectifier is connected to one end of the secondary coil of the transformer, the other end of the secondary coil of the transformer is grounded, and the other end of the rectifier is grounded through the filter capacitor, and serves as the AC-DC The DC output of the module.
[权利要求 6] 如权利要求 5所述的 LED驱动电路， 其特征在于， 所述整流器为整流 二极管， 该整流二极管的阳极接所述变压器的次级线圈的一端， 阴极 接所述滤波电容。  The LED driving circuit according to claim 5, wherein the rectifier is a rectifying diode, an anode of the rectifying diode is connected to one end of a secondary coil of the transformer, and a cathode is connected to the filter capacitor.
PCT/CN2015/098754 2015-12-24 2015-12-24 Led drive circuit WO2017107146A1 (en)

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Cited By (8)

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CN107896403A (en) * 2017-12-20 2018-04-10 广东恒润光电有限公司 A kind of LED power
CN107917770A (en) * 2017-12-07 2018-04-17 太原理工大学 Possesses the road foundation pressure-detecting device of long distance transmission and anti-interference function
CN110139445A (en) * 2019-05-31 2019-08-16 深圳市奋勇光电有限公司 A kind of electricity and brightness adjustment control two-in-one circuit
CN111835326A (en) * 2020-07-29 2020-10-27 成都通用整流电器研究所 Module safety control protection and indicating circuit based on IGBT drive
CN113645738A (en) * 2021-07-22 2021-11-12 西安中科微星光电科技有限公司 Light source control circuit
CN114080078A (en) * 2020-08-10 2022-02-22 苏州斯特雷电子有限公司 Intelligent driver and driving method for LED lamp strip
CN116247796A (en) * 2023-03-02 2023-06-09 深圳市景欣泰家居用品有限公司 Circuit system of dual-mode blower and control method thereof

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CN107734778B (en) * 2017-11-13 2024-02-09 美智光电科技股份有限公司 LED driving power circuit and light emitting device
CN107734778A (en) * 2017-11-13 2018-02-23 江西美的贵雅照明有限公司 LED drive power circuit and luminaire
CN107917770B (en) * 2017-12-07 2023-06-16 太原理工大学 Road subgrade pressure detection device with long-distance transmission and anti-interference functions
CN107917770A (en) * 2017-12-07 2018-04-17 太原理工大学 Possesses the road foundation pressure-detecting device of long distance transmission and anti-interference function
CN107896403A (en) * 2017-12-20 2018-04-10 广东恒润光电有限公司 A kind of LED power
CN107896403B (en) * 2017-12-20 2024-03-12 广东恒润光电有限公司 LED power supply
CN110139445A (en) * 2019-05-31 2019-08-16 深圳市奋勇光电有限公司 A kind of electricity and brightness adjustment control two-in-one circuit
CN111835326B (en) * 2020-07-29 2023-08-18 成都通用整流电器研究所 Module safety control protection and indication circuit based on IGBT drive
CN111835326A (en) * 2020-07-29 2020-10-27 成都通用整流电器研究所 Module safety control protection and indicating circuit based on IGBT drive
CN114080078A (en) * 2020-08-10 2022-02-22 苏州斯特雷电子有限公司 Intelligent driver and driving method for LED lamp strip
CN114080078B (en) * 2020-08-10 2024-02-20 苏州斯特雷电子有限公司 Intelligent driver and driving method for LED lamp strip
CN113645738A (en) * 2021-07-22 2021-11-12 西安中科微星光电科技有限公司 Light source control circuit
CN116247796A (en) * 2023-03-02 2023-06-09 深圳市景欣泰家居用品有限公司 Circuit system of dual-mode blower and control method thereof

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