WO2016000414A1 - Valley-fill current correction and dimmable led drive circuit - Google Patents

Valley-fill current correction and dimmable led drive circuit Download PDF

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WO2016000414A1
WO2016000414A1 PCT/CN2014/093362 CN2014093362W WO2016000414A1 WO 2016000414 A1 WO2016000414 A1 WO 2016000414A1 CN 2014093362 W CN2014093362 W CN 2014093362W WO 2016000414 A1 WO2016000414 A1 WO 2016000414A1
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circuit
valley
current
resistor
inductor
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PCT/CN2014/093362
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苏松得
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苏松得
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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
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • 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
    • 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 an LED driving circuit, in particular to a valley filling current correcting dimmable LED driving circuit.
  • LED lamp has the advantages of energy saving, long service life and low driving voltage. It is a new type of green environmental protection light source, widely used in reading lamps, flashlights, car headlights, small spotlights, signs, dome lighting, decorative lights and other occasions. in.
  • the LED lamp needs to adopt constant current driving mode to ensure its normal illumination, and it is of great significance to reduce the total harmonic distortion of the LED lamp driving power supply, solve the linear capacitance problem and improve the power factor.
  • the technical problem to be solved by the embodiments of the present invention is to provide a valley-filled current-correcting dimmable LED driving circuit. It can improve the power factor of the LED driver circuit, significantly reduce the total harmonic distortion, and effectively control the stability of the LED operating current.
  • an embodiment of the present invention provides a valley-filled current-correcting dimmable LED driving circuit, including a valley-filling circuit for correcting a rectified input current, which is connected in parallel to the output of the valley-filling circuit.
  • Switching circuit and feedback circuit providing load current feedback;
  • the switch circuit has a storage inductor L3 and a switch controller U1 that functions as a switch for the energy storage inductor L3.
  • the switch controller U1 When the switch controller U1 is turned off, the energy storage inductor L3 is given by the first isolation diode VD1.
  • the storage capacitor C3 is charged.
  • the first Zener diode VS1 is an ultrafast recovery diode or a Schottky rectifier diode.
  • the feedback circuit includes a first Zener diode VS1, a second Zener diode VS2, and a first resistor R11. And an RDC voltage clamping circuit formed by the capacitor C8, the voltage clamping circuit is connected in parallel to the storage capacitor C3 through the illuminator U2A of the optical coupler U2; and comprises a series connection of the bleeder resistor R10 and the current sampling resistor R8. Sampling circuit, the illuminator is connected to the loop access end of the current sampling resistor R8 through a gain setting resistor R7;
  • the feedback input terminal FB of the switch controller U1 is connected to the bypass terminal BP through the feedback resistor, the photodetector of the optocoupler U2, and the bypass terminal BP is connected to the negative pole of the power supply through the bypass capacitor C4;
  • a voltage dividing network connected in parallel to the rectified output terminal is further provided, and the triode VT1 connected in parallel to the photoreceiver obtains a power switching cycle signal from the voltage dividing network such that the switch controller U1 outputs a corresponding switching signal.
  • an isolation diode VD5 is connected in series between the valley filling circuit and the rectified output end.
  • the circuit further includes an EM I filtering circuit for the AC input current, wherein the first inductor L1 and the second inductor L2 are respectively connected in series on the live line and the zero line, the first differential mode filter capacitor C5 and the second differential mode filter capacitor C9. Connected to the input end of the first inductor L1 and the second inductor L2 and the output end respectively.
  • the voltage dividing network includes a second resistor R2 and a voltage dividing branch connected to the rectified output end, and a base of the triode VT1 obtains an AC detecting node from the voltage dividing branch.
  • the first Zener diode VS1 is an ultrafast recovery diode or a Schottky rectifier diode.
  • the invention corrects and dims the LED through the valley filling circuit, and changes the input current waveform from a spike to a sine wave, which meets the requirements of the Energy Star SSL power factor and satisfies EN55015B.
  • the required index is matched with the rectifying and filtering circuit by the switch controller, which solves the linear capacitance problem existing in the circuit board and stabilizes the output driving current.
  • Figure 1 is a schematic view showing the circuit structure of the present invention.
  • a valley-filled current-correcting dimmable LED driving circuit of the present invention includes a valley-filling circuit for correcting a rectified input current, a switching circuit connected in parallel with the output of the valley-filling circuit, and a load current feedback Feedback circuit.
  • the full-wave rectification is realized by the bridge rectifier BR1.
  • the diodes VD2, VD3, VD4 and the capacitors C1 and C2 together form a valley filling circuit and provide power factor correction.
  • the valley filling circuit corrects the rectified input current and improves the improvement. Power factor.
  • the capacitor C2, the diode VD2, the resistor R1, and the capacitor C1 are sequentially connected in series to form a charging circuit, the capacitors C1 and C2 are charged in series, and the diode VD3, the capacitor C2, the capacitor C1, and the diode VD4 form a discharge loop. Capacitors C1 and C2 are then discharged in parallel.
  • the conduction angle of the input current can be continuously increased from 30° to 150° and from 210° to 330°, which greatly improves the THD (Total Harmonic Distortion) and power factor in the system.
  • the resistor R1 helps to smooth the input current spike, and can also improve the power factor by limiting the current flowing into the capacitors C1 and C2.
  • the isolation diode VD5 is connected in series between the valley filling circuit and the rectified output terminal to isolate the voltage from the large capacitance, so as to obtain the power conduction angle signal, and the capacitor C7 is connected to the output end of the valley filling circuit. Helps improve EMI performance.
  • a circuit with EMI filtering is serially connected to the AC input end, and the first inductor L1 and the second inductor L2 are respectively connected in series on the live line and the zero line, and the first differential mode filter capacitor C5 and the second differential mode filter capacitor C9 are respectively connected to each other.
  • the first inductor L1 and the second inductor L2 are respectively connected with resistors R12 and R13, and the inductors L1 and L2 and the resistors R12 and R13 cooperate. The down is reduced.
  • the switch circuit has a storage inductor L3 and a switch controller U1 that acts as a switch for the storage inductor L3.
  • the inductor L3 controls the energy storage in the buck-boost converter.
  • the switch controller U1 When the switch controller U1 is turned off, the inductor
  • the current in L3 charges the storage capacitor C3 through the first isolation diode VD1 and serves as an output, and energy storage is performed when the switch controller U1 is turned on.
  • VD1 is an ultra-fast recovery diode or a Schottky rectifier diode.
  • the feedback circuit includes a first Zener diode VS1, a second Zener diode VS2, and a first resistor R11. And an RDC voltage clamping circuit formed by the capacitor C8, the voltage clamping circuit is connected in parallel to the storage capacitor C3 through the illuminator U2A of the optical coupler U2; and a sampling circuit formed by connecting the bleeder resistor R10 and the current sampling resistor R8 in series, The illuminator U2A is connected to the loop access terminal RTN of the current sampling resistor R8 via a gain setting resistor R7.
  • VS1, VS2 and R11 can clamp the output voltage under no-load conditions to control.
  • the feedback input terminal FB of the switch controller U1 is connected to the bypass terminal BP of U1 through the feedback resistors R9 and R3 and the photoreceiver U2B of the photocoupler U2, and the bypass terminal BP is connected to the negative pole of the power supply through the bypass capacitor C4.
  • the voltage dividing network includes a second resistor R2 and a voltage dividing branch connected to the rectified output end, the voltage dividing branch routing resistors R5, R6, and R4 are connected in series, and the resistor R4 is connected to the capacitor C6 in parallel to the photoreceiver U2B.
  • Transistor VT1 obtains a power switch cycle signal from R4 such that switch controller U1 outputs a corresponding switch signal.
  • the conduction and switching time of the VT1 can be accelerated.
  • the FB pin is sampled. If the current is low to the set value, the MOSFET switch in the switch controller U1 will be restored again. The adjustment of the output is done by enabling or disabling the switching cycle.
  • the voltage across current sense resistor R8 is applied between U2A and gain setting R7, which is applied to the FB pin of U1 through R9 of U2B.
  • R10 is the output bleeder resistance. When the output cannot be adjusted normally, the resistance change can be adjusted.
  • the feedback voltage is reduced by using the dimming device, and the voltage on C6 is decreased, which reduces the voltage on the base of VT1.
  • the base voltage of VT1 falls below the set voltage, VT1 will self-return and push the current into FB.
  • the foot, the suppression switch can control the average load current to reduce the stability of the LED dimming.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Disclosed is a valley-fill current correction and dimmable LED drive circuit. The circuit comprises a valley-fill circuit for correcting an input current after rectification, a switch circuit connected in parallel to an output terminal of the valley-fill circuit, and a feedback circuit for providing a load current feedback. By means of the present invention, the valley-fill current correction and dimmable LED drive circuit meets the Energy Star requirements for the SSL power factor, has high efficiency and can satisfy the required index of EN55015B (EMI). Controllable LED dimming is achieved through a switch controller. The LED drive circuit has such functions as over-voltage protection, hysteretic thermal shutdown protection, automatic start-up, and output short circuit protection.

Description

一种填谷式电流修正可调光LED驱动电路Filling type current correction dimmable LED driving circuit 技术领域Technical field
本发明涉及一种LED驱动电路，尤其涉及一种填谷式电流修正可调光LED驱动电路。The invention relates to an LED driving circuit, in particular to a valley filling current correcting dimmable LED driving circuit.
背景技术Background technique
LED灯具有节能、使用寿命长、驱动电压低等优点，是一种新型绿色环保光源，广泛应用于阅读灯、手电筒、汽车大灯、小型聚光灯、标牌、穹顶照明、装饰明灯等各种场合之中。LED灯需采用恒流驱动方式，以保证其正常发光，而对于降低LED灯驱动电源的总谐波失真，解决线性电容问题、提高功率因数具有重要意义。LED lamp has the advantages of energy saving, long service life and low driving voltage. It is a new type of green environmental protection light source, widely used in reading lamps, flashlights, car headlights, small spotlights, signs, dome lighting, decorative lights and other occasions. in. The LED lamp needs to adopt constant current driving mode to ensure its normal illumination, and it is of great significance to reduce the total harmonic distortion of the LED lamp driving power supply, solve the linear capacitance problem and improve the power factor.
发明内容Summary of the invention
本发明实施例所要解决的技术问题在于，提供一种填谷式电流修正可调光LED驱动电路。可提高LED驱动电路的功率因数，明显降低总谐波失真，有效控制LED工作电流的稳定性。The technical problem to be solved by the embodiments of the present invention is to provide a valley-filled current-correcting dimmable LED driving circuit. It can improve the power factor of the LED driver circuit, significantly reduce the total harmonic distortion, and effectively control the stability of the LED operating current.
为了解决上述技术问题，本发明实施例提供了一种填谷式电流修正可调光LED驱动电路，包括对整流后的输入电流进行校正的填谷电路，并联于所述填谷电路输出端上的开关电路以及提供负载电流反馈的反馈电路；In order to solve the above technical problem, an embodiment of the present invention provides a valley-filled current-correcting dimmable LED driving circuit, including a valley-filling circuit for correcting a rectified input current, which is connected in parallel to the output of the valley-filling circuit. Switching circuit and feedback circuit providing load current feedback;
所述开关电路具有储能电感L3以及对所述储能电感L3起开关作用的开关控制器U1，所述开关控制器U1关断动作时，所述储能电感L3通过第一隔离二极管VD1给储能电容C3充电。The switch circuit has a storage inductor L3 and a switch controller U1 that functions as a switch for the energy storage inductor L3. When the switch controller U1 is turned off, the energy storage inductor L3 is given by the first isolation diode VD1. The storage capacitor C3 is charged.
需要进行说明的是，第一稳压二极管VS1为超快恢复二极管或肖特基整流二极管。It should be noted that the first Zener diode VS1 is an ultrafast recovery diode or a Schottky rectifier diode.
反馈电路包括第一稳压二极管VS1、第二稳压二极管VS2、第一电阻R11以 及电容C8构成的RDC电压钳位电路，所述电压钳位电路通过光耦合器U2的发光器U2A并联于所述储能电容C3上；以及包括由泄放电阻R10与电流采样电阻R8串联构成的采样电路，所述发光器通过增益设定电阻R7连接所述电流采样电阻R8的回路接入端；The feedback circuit includes a first Zener diode VS1, a second Zener diode VS2, and a first resistor R11. And an RDC voltage clamping circuit formed by the capacitor C8, the voltage clamping circuit is connected in parallel to the storage capacitor C3 through the illuminator U2A of the optical coupler U2; and comprises a series connection of the bleeder resistor R10 and the current sampling resistor R8. Sampling circuit, the illuminator is connected to the loop access end of the current sampling resistor R8 through a gain setting resistor R7;
所述开关控制器U1的反馈输入端FB通过反馈电阻、所述光耦合器U2的受光器并接于旁路端BP上，所述旁路端BP通过旁路电容C4连接电源负极；The feedback input terminal FB of the switch controller U1 is connected to the bypass terminal BP through the feedback resistor, the photodetector of the optocoupler U2, and the bypass terminal BP is connected to the negative pole of the power supply through the bypass capacitor C4;
还包括并联于整流输出端上的分压网络，并联于所述受光器的三极管VT1从所述分压网络获得电源开关周期信号使得所述开关控制器U1输出相应的开关信号。A voltage dividing network connected in parallel to the rectified output terminal is further provided, and the triode VT1 connected in parallel to the photoreceiver obtains a power switching cycle signal from the voltage dividing network such that the switch controller U1 outputs a corresponding switching signal.
进一步地，其特征在于，所述填谷电路与所述整流输出端之间串接有隔离二极管VD5。Further, it is characterized in that an isolation diode VD5 is connected in series between the valley filling circuit and the rectified output end.
进一步地，还包括对交流输入电流进行EM I滤波的电路，在火线与零线上分别串接第一电感L1、第二电感L2，第一差模滤波电容C5与第二差模滤波电容C9分别并接于所述第一电感L1、第二电感L2的输入端上与输出端上。Further, the circuit further includes an EM I filtering circuit for the AC input current, wherein the first inductor L1 and the second inductor L2 are respectively connected in series on the live line and the zero line, the first differential mode filter capacitor C5 and the second differential mode filter capacitor C9. Connected to the input end of the first inductor L1 and the second inductor L2 and the output end respectively.
进一步地，所述分压网络包括并接于所述整流输出端上的第二电阻R2以及分压支路，所述三极管VT1的基极从所述分压支路获得AC检测节点。Further, the voltage dividing network includes a second resistor R2 and a voltage dividing branch connected to the rectified output end, and a base of the triode VT1 obtains an AC detecting node from the voltage dividing branch.
进一步地，所述第一稳压二极管VS1为超快恢复二极管或肖特基整流二极管。Further, the first Zener diode VS1 is an ultrafast recovery diode or a Schottky rectifier diode.
实施本发明实施例，具有如下有益效果：本发明通过填谷式电路校正并可调光LED，使输入电流波形从尖峰脉冲变为接近正弦波，符合能源之星SSL功率因数的要求，满足EN55015B要求指标，使用开关控制器与整流滤波电路匹配，解决了电路板存在的线性电容问题，稳定输出驱动电流。The embodiment of the invention has the following beneficial effects: the invention corrects and dims the LED through the valley filling circuit, and changes the input current waveform from a spike to a sine wave, which meets the requirements of the Energy Star SSL power factor and satisfies EN55015B. The required index is matched with the rectifying and filtering circuit by the switch controller, which solves the linear capacitance problem existing in the circuit board and stabilizes the output driving current.
附图说明DRAWINGS
图1是本发明的电路结构示意图。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the circuit structure of the present invention.
具体实施方式detailed description
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明 作进一步地详细描述。In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be described below with reference to the accompanying drawings. Further details are described.
参照图1所示的本发明的电路结构示意图。Referring to the schematic diagram of the circuit structure of the present invention shown in FIG.
本发明的一种填谷式电流修正可调光LED驱动电路，包括对整流后的输入电流进行校正的填谷电路，并联于所述填谷电路输出端上的开关电路以及提供负载电流反馈的反馈电路。A valley-filled current-correcting dimmable LED driving circuit of the present invention includes a valley-filling circuit for correcting a rectified input current, a switching circuit connected in parallel with the output of the valley-filling circuit, and a load current feedback Feedback circuit.
全波整流由桥式整流器BR1来实现完成，二级管VD2、VD3、VD4以及电容C1、C2共同形成填谷电路，并提供功率因数校正，填谷电路是对整流输入电流进行校正，改善提升功率因数。其中，电容C2、二级管VD2、电阻R1、电容C1依次串联形成充电回路，电容C1、C2以串联方式充电，而二级管VD3、电容C2以及电容C1、二级管VD4形成放电回路，电容C1、C2再以并联方式放电。由此，输入电流的导通角可连续从30°提升至150°，从210°升至330°，这样可以极大程度改善系统中的THD(总谐波失真)和功率因数。其中，电阻R1有助于平滑输入电流尖峰，还可以通过限制流入电容C1、C2的电流来改善功率因数。The full-wave rectification is realized by the bridge rectifier BR1. The diodes VD2, VD3, VD4 and the capacitors C1 and C2 together form a valley filling circuit and provide power factor correction. The valley filling circuit corrects the rectified input current and improves the improvement. Power factor. Wherein, the capacitor C2, the diode VD2, the resistor R1, and the capacitor C1 are sequentially connected in series to form a charging circuit, the capacitors C1 and C2 are charged in series, and the diode VD3, the capacitor C2, the capacitor C1, and the diode VD4 form a discharge loop. Capacitors C1 and C2 are then discharged in parallel. As a result, the conduction angle of the input current can be continuously increased from 30° to 150° and from 210° to 330°, which greatly improves the THD (Total Harmonic Distortion) and power factor in the system. Among them, the resistor R1 helps to smooth the input current spike, and can also improve the power factor by limiting the current flowing into the capacitors C1 and C2.
更佳地，填谷电路与整流输出端之间串接有隔离二极管VD5，将电压与大电容隔离，这样以便获得电源导通角信号，填谷电路的输出端上并接有电容C7，有助于改善EMI性能。More preferably, the isolation diode VD5 is connected in series between the valley filling circuit and the rectified output terminal to isolate the voltage from the large capacitance, so as to obtain the power conduction angle signal, and the capacitor C7 is connected to the output end of the valley filling circuit. Helps improve EMI performance.
交流输入端上串接有EMI滤波的电路，火线与零线上分别串接第一电感L1、第二电感L2，第一差模滤波电容C5与第二差模滤波电容C9分别并接于所述第一电感L1、第二电感L2的输入端上与输出端上，第一电感L1、第二电感L2上分别并接有电阻R12、R13，在电感L1、L2及电阻R12、R13共同作用下得以降低。A circuit with EMI filtering is serially connected to the AC input end, and the first inductor L1 and the second inductor L2 are respectively connected in series on the live line and the zero line, and the first differential mode filter capacitor C5 and the second differential mode filter capacitor C9 are respectively connected to each other. On the input end and the output end of the first inductor L1 and the second inductor L2, the first inductor L1 and the second inductor L2 are respectively connected with resistors R12 and R13, and the inductors L1 and L2 and the resistors R12 and R13 cooperate. The down is reduced.
开关电路具有储能电感L3以及对储能电感L3起开关作用的开关控制器U1，电感L3是控制降压-升压式变换器中的能量存储，在开关控制器U1关断动作时，电感L3中的电流通过第一隔离二极管VD1给储能电容C3充电，并作为输出端，而在开关控制器U1导通状态时，进行能量储存。其中，VD1是超快恢复二极管或肖特基整流二极管。The switch circuit has a storage inductor L3 and a switch controller U1 that acts as a switch for the storage inductor L3. The inductor L3 controls the energy storage in the buck-boost converter. When the switch controller U1 is turned off, the inductor The current in L3 charges the storage capacitor C3 through the first isolation diode VD1 and serves as an output, and energy storage is performed when the switch controller U1 is turned on. Among them, VD1 is an ultra-fast recovery diode or a Schottky rectifier diode.
反馈电路包括第一稳压二极管VS1、第二稳压二极管VS2、第一电阻R11以 及电容C8构成的RDC电压钳位电路，电压钳位电路通过光耦合器U2的发光器U2A并联于储能电容C3上；还包括由泄放电阻R10与电流采样电阻R8串联构成的采样电路，发光器U2A通过增益设定电阻R7连接所述电流采样电阻R8的回路接入端RTN。其中，VS1、VS2和R11能够在空载的条件下将输出电压钳位得到控制。The feedback circuit includes a first Zener diode VS1, a second Zener diode VS2, and a first resistor R11. And an RDC voltage clamping circuit formed by the capacitor C8, the voltage clamping circuit is connected in parallel to the storage capacitor C3 through the illuminator U2A of the optical coupler U2; and a sampling circuit formed by connecting the bleeder resistor R10 and the current sampling resistor R8 in series, The illuminator U2A is connected to the loop access terminal RTN of the current sampling resistor R8 via a gain setting resistor R7. Among them, VS1, VS2 and R11 can clamp the output voltage under no-load conditions to control.
开关控制器U1的反馈输入端FB通过反馈电阻R9、R3、光耦合器U2的受光器U2B并接于U1的旁路端BP上，旁路端BP通过旁路电容C4连接电源负极。The feedback input terminal FB of the switch controller U1 is connected to the bypass terminal BP of U1 through the feedback resistors R9 and R3 and the photoreceiver U2B of the photocoupler U2, and the bypass terminal BP is connected to the negative pole of the power supply through the bypass capacitor C4.
分压网络包括并接于整流输出端上的第二电阻R2以及分压支路，分压支路由电阻R5、R6、R4串接构成，电阻R4上并接电容C6，并联于受光器U2B的三极管VT1从R4上获得电源开关周期信号使得所述开关控制器U1输出相应的开关信号。The voltage dividing network includes a second resistor R2 and a voltage dividing branch connected to the rectified output end, the voltage dividing branch routing resistors R5, R6, and R4 are connected in series, and the resistor R4 is connected to the capacitor C6 in parallel to the photoreceiver U2B. Transistor VT1 obtains a power switch cycle signal from R4 such that switch controller U1 outputs a corresponding switch signal.
电阻R2加载AC检测节点后可加快VT1的导通和开关时间。进入器件的下一个内部时钟周期后，会对FB脚进行信号采样，如果电流低以设定的数值，开关控制器U1内的MOSFET开关将再次恢复使能。对输出的调节是通过使能或禁止开关周期来完成。After the resistor R2 is loaded with the AC detection node, the conduction and switching time of the VT1 can be accelerated. After entering the next internal clock cycle of the device, the FB pin is sampled. If the current is low to the set value, the MOSFET switch in the switch controller U1 will be restored again. The adjustment of the output is done by enabling or disabling the switching cycle.
电流采样电阻R8上的电压施加在U2A与增益设定R7之间，此反馈信号通过U2B的R9被施加到U1的FB脚。R10是输出的泄放电阻，当无法正常调整输出时，可以将阻值改变式调整完成。The voltage across current sense resistor R8 is applied between U2A and gain setting R7, which is applied to the FB pin of U1 through R9 of U2B. R10 is the output bleeder resistance. When the output cannot be adjusted normally, the resistance change can be adjusted.
反馈电压因使用调光器件而降低，C6上的电压随之下降，从而降低VT1基极上的电压，VT1基极电压降至设定电压以下时VT1将自复导通，将电流推入FB脚，抑制开关，可控降低平均负载电流，完成LED调光的稳定性能。The feedback voltage is reduced by using the dimming device, and the voltage on C6 is decreased, which reduces the voltage on the base of VT1. When the base voltage of VT1 falls below the set voltage, VT1 will self-return and push the current into FB. The foot, the suppression switch, can control the average load current to reduce the stability of the LED dimming.
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。 The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims (5)

  1. 一种填谷式电流修正可调光LED驱动电路，其特征在于，包括对整流后的输入电流进行校正的填谷电路，并联于所述填谷电路输出端上的开关电路以及提供负载电流反馈的反馈电路；A valley-filled current-correctable dimmable LED driving circuit, comprising: a valley filling circuit for correcting a rectified input current, a switching circuit connected in parallel with the output of the valley filling circuit, and providing load current feedback Feedback circuit
    所述开关电路具有储能电感L3以及对所述储能电感L3起开关作用的开关控制器U1，所述开关控制器U1关断动作时，所述储能电感L3通过第一隔离二极管VD1给储能电容C3充电；The switch circuit has a storage inductor L3 and a switch controller U1 that functions as a switch for the energy storage inductor L3. When the switch controller U1 is turned off, the energy storage inductor L3 is given by the first isolation diode VD1. The storage capacitor C3 is charged;
    反馈电路包括第一稳压二极管VS1、第二稳压二极管VS2、第一电阻R11以及电容C8构成的RDC电压钳位电路，所述电压钳位电路通过光耦合器U2的发光器U2A并联于所述储能电容C3上；以及包括由泄放电阻R10与电流采样电阻R8串联构成的采样电路，所述发光器通过增益设定电阻R7连接所述电流采样电阻R8的回路接入端；The feedback circuit includes an RDC voltage clamping circuit composed of a first Zener diode VS1, a second Zener diode VS2, a first resistor R11, and a capacitor C8. The voltage clamping circuit is connected in parallel through the illuminator U2A of the optical coupler U2. The storage capacitor C3; and a sampling circuit comprising a bleeder resistor R10 and a current sampling resistor R8 connected in series, the illuminator is connected to the loop access terminal of the current sampling resistor R8 through a gain setting resistor R7;
    所述开关控制器U1的反馈输入端FB通过反馈电阻、所述光耦合器U2的受光器并接于旁路端BP上，所述旁路端BP通过旁路电容C4连接电源负极；The feedback input terminal FB of the switch controller U1 is connected to the bypass terminal BP through the feedback resistor, the photodetector of the optocoupler U2, and the bypass terminal BP is connected to the negative pole of the power supply through the bypass capacitor C4;
    还包括并联于整流输出端上的分压网络，并联于所述受光器的三极管VT1从所述分压网络获得电源开关周期信号使得所述开关控制器U1输出相应的开关信号。A voltage dividing network connected in parallel to the rectified output terminal is further provided, and the triode VT1 connected in parallel to the photoreceiver obtains a power switching cycle signal from the voltage dividing network such that the switch controller U1 outputs a corresponding switching signal.
  2. 根据权利要求1所述的填谷式电流修正可调光LED驱动电路，其特征在于，所述填谷电路与所述整流输出端之间串接有隔离二极管VD5。The valley-filled current-correcting dimmable LED driving circuit according to claim 1, wherein an isolation diode VD5 is connected in series between the valley filling circuit and the rectified output terminal.
  3. 根据权利要求1所述的填谷式电流修正可调光LED驱动电路，其特征在于，还包括对交流输入电流进行EMI滤波的电路，在火线与零线上分别串接第一电感L1、 第二电感L2，第一差模滤波电容C5与第二差模滤波电容C9分别并接于所述第一电感L1、第二电感L2的输入端上与输出端上。The valley-filled current-correcting dimmable LED driving circuit according to claim 1, further comprising: EMI filtering the AC input current, wherein the first inductor L1 is connected in series on the live line and the zero line; The second inductor L2, the first differential mode filter capacitor C5 and the second differential mode filter capacitor C9 are respectively connected to the input end of the first inductor L1 and the second inductor L2 and the output end.
  4. 根据权利要求1所述的填谷式电流修正可调光LED驱动电路，其特征在于，所述分压网络包括并接于所述整流输出端上的第二电阻R2以及分压支路，所述三极管VT1的基极从所述分压支路获得AC检测节点。The valley-filled current-correcting dimmable LED driving circuit according to claim 1, wherein the voltage dividing network comprises a second resistor R2 and a voltage dividing branch connected to the rectified output end, The base of the transistor VT1 obtains an AC detecting node from the voltage dividing branch.
  5. 根据权利要求1所述的填谷式电流修正可调光LED驱动电路，其特征在于，所述第一稳压二极管VS1为超快恢复二极管或肖特基整流二极管。 The valley-filled current-correcting dimmable LED driving circuit according to claim 1, wherein the first Zener diode VS1 is an ultra-fast recovery diode or a Schottky rectifier diode.
PCT/CN2014/093362 2014-07-03 2014-12-09 Valley-fill current correction and dimmable led drive circuit WO2016000414A1 (en)

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