WO2012068765A1 - Led driving power supply - Google Patents

Led driving power supply Download PDF

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Publication number
WO2012068765A1
WO2012068765A1 PCT/CN2010/080591 CN2010080591W WO2012068765A1 WO 2012068765 A1 WO2012068765 A1 WO 2012068765A1 CN 2010080591 W CN2010080591 W CN 2010080591W WO 2012068765 A1 WO2012068765 A1 WO 2012068765A1
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WO
WIPO (PCT)
Prior art keywords
resistor
capacitor
voltage
control chip
driving power
Prior art date
Application number
PCT/CN2010/080591
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French (fr)
Chinese (zh)
Inventor
黄鹤鸣
Original Assignee
深圳市聚作实业有限公司
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Application filed by 深圳市聚作实业有限公司 filed Critical 深圳市聚作实业有限公司
Priority to JP2013540212A priority Critical patent/JP2014501023A/en
Priority to GB1309644.1A priority patent/GB2498695B/en
Publication of WO2012068765A1 publication Critical patent/WO2012068765A1/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
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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 present invention relates to an LED driving power supply. Background technique
  • LED Light Emitting Diode
  • the traditional LED driver power supply is usually implemented by the following schemes: After rectification and filtering, the utility power is pulsed-modulated (PWM) technology, combined with voltage sampling or current sampling circuit, and fed back to the PWM main control chip to achieve stable output of voltage or current. .
  • PWM pulsed-modulated
  • the conventional LED driving power supply uses a diode and electrolytic capacitor filling method to achieve power factor correction, because the use of electrolytic capacitors reduces the service life of the LED driving power supply. Summary of the invention
  • the LED driving power supply of the present invention comprises a comparator, an optocoupler portion, a transformer having a primary main winding, a secondary main winding, a primary auxiliary winding, a secondary auxiliary winding, and a control connected to the primary main winding and the primary auxiliary winding a chip, the secondary main winding is connected to a current detecting end of the LED load through a detecting resistor, and the detecting resistor converts the LED load current change amount detected by the current detecting end into a voltage change amount, and the voltage change amount is passed through the comparator A reference voltage is compared, the output of the comparator is fed back to the feedback loop function control pin of the control chip through the optocoupler part, and the voltage on the feedback loop function control pin is compared with the internal crystal oscillator voltage of the control chip, thereby adjusting the internal field effect of the control chip
  • the width of the gate voltage duty cycle of the tube is used to perform average current
  • Figure 1 is a circuit diagram of an LED driving power supply of the present invention.
  • Fig. 2 is another circuit diagram of the LED driving power supply of the present invention.
  • Fig. 3 is another circuit diagram of the LED driving power supply of the present invention.
  • FIG. 4 is a further circuit diagram of the LED driving power supply of the present invention. detailed description
  • the LED driving power supply of the present invention comprises an optocoupler portion composed of a comparator U6, an optocoupler OT1-A and an optocoupler OT1-B, having a primary main winding Tl-A, a secondary main winding Tl-D, The primary auxiliary winding T1-B, the transformer T1 of the secondary auxiliary winding T1-C, and the control chip U1.
  • the LED driving power supply further includes an anti-electromagnetic interference portion, which includes an input AC terminal connected to the fuse F1-end, and the other end of the fuse F1 is connected to one end of the resistor R1 and the capacitor C1, and a node between the fuse F1 and the resistor R1.
  • an anti-electromagnetic interference portion which includes an input AC terminal connected to the fuse F1-end, and the other end of the fuse F1 is connected to one end of the resistor R1 and the capacitor C1, and a node between the fuse F1 and the resistor R1.
  • the drain of the FET is integrated in the 8th pin of the control chip U1
  • the source of the FET is integrated in the 1st pin
  • the gate of the FET is integrated in the 4th pin.
  • Control chip U1 pin 1 Resistor R12—terminal
  • pin 6 is connected to the primary auxiliary winding T1-B, and the other end of the resistor R12 is grounded.
  • the first pin and the eighth pin of the control chip U1 are connected to the capacitor C5.
  • the primary main winding T1-A and the capacitor C5 are connected in series to form a resonant network.
  • the connection point between the capacitor C5 and the first leg of the control chip U1 is connected to the capacitor C6-terminal, and the other end of the capacitor C6 is connected to the OCP function terminal of the third pin of the control chip U1.
  • the LED driving power supply further comprises a quasi-resonant malfunctioning circuit, which comprises a primary auxiliary winding T1-B connected to the resistor R7 at one end and a resistor R12 at the other end, the other end of the resistor R7 is connected to the rectifier D3, and the resistor R7 and the resistor D3 are connected to the diode.
  • the anode of D4, the cathode of diode D4 is connected to the resistor R9-terminal, the other end of the resistor R9 is connected to the anode of the capacitor C7- terminal and the diode D5, and the other end of the capacitor C7 is connected to the resistor R12.
  • the secondary main winding T1-D is terminated with the anode of the diode D2, the cathode of the diode D2 is connected to the anode of the capacitor C11 and the capacitor C12, one end of the Zener Z3, and the other end of the secondary main winding T1-D.
  • the detection resistor R13 and the cathode of the diode D57 are connected, and the anode of the diode D57 and the detecting resistor R13 are connected to the current detecting terminal -IS of the LED load.
  • Sense resistor R13 voltage across the 3 ⁇ 4»57 clamp is within the safe range and the protection sense resistor R13 is not damaged.
  • the reference voltage REF is applied to the resistor R25, resistor R26, and capacitor C17 through resistor R23 and resistor R24 as the reference voltage.
  • the optocoupler OT1-A in Figure 2 is connected in series with the resistor Rl 1 and the resistor R12 between the fourth pin of the control chip U1 and the ground.
  • the optocoupler OT1-B in Figure 4 is connected in parallel with resistor R30 and then in series with resistor R29 between the 5V voltage and the output of comparator U6.
  • the detecting resistor R13 converts the LED load current change amount detected by the current detecting terminal -IS into a voltage change amount, the voltage change amount is compared with the reference voltage through the comparator U6, and the output of the comparator U6 passes through the optocoupler OT1 - A, OT1 -B is fed back to the fourth pin of the control chip U1 (feedback loop function control pin), and the voltage on the feedback loop function control pin is compared with the internal crystal oscillator voltage of the control chip, thereby The ON width of the gate voltage duty ratio of the internal FET of the control chip U1 is adjusted to perform average current control.
  • the current detection terminal -IS voltage decreases, and the current flowing through the optocoupler OT1-B decreases when the voltage at the end of the comparator U6 connected to the current detecting terminal -IS decreases relative to the reference voltage.
  • the current fed back to the control chip U1 through the optocoupler ⁇ 1- ⁇ , OT1-B is also reduced, and the ON width of the gate voltage duty ratio of the internal FET of the control chip U1 is narrowed, and the current peak is reduced, thereby A corresponding drain current peak waveform (the drain current peak is proportional to the input voltage) is formed to achieve average current control.
  • the LED load current is increased, that is, when the current detecting terminal -IS voltage is increased with respect to the reference voltage of the comparator U6, the current flowing through the optocoupler OT1-B is increased, and the passing light is increased.
  • the current fed back to the control chip U1 is also increased, and the ON width of the gate voltage duty ratio of the internal field effect transistor of the control chip U1 is widened, and the current peak is increased to form a corresponding drain.
  • the current peak waveform (the drain current peak is proportional to the input voltage) for average current control.

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

Abstract

An LED driving power supply comprises a comparator (U6), an optocoupler portion, a transformer (T1) having a primary main winding (T1-A), a secondary main winding (T1-D), a primary auxiliary winding (T1-B), and a secondary auxiliary winding (T1-C), and a control chip (U1) connected with the primary main winding (T1-A) and the primary auxiliary winding (T1-B). The secondary main winding (T1-D) is connected with a current detection end (-IS) of an LED load through a detection resistance (R13), which converts a current variation of the LED load detected by the current detection end (-IS) into a voltage variation. The voltage variation is compared with a reference voltage through the comparator (U6), the output of which is fed back to a feedback loop function control pin of the control chip (U1) through the optocoupler portion. The voltage of the feedback loop function control pin is compared with a voltage of an inner crystal oscillator of the control chip (U1), thus the duty cycle width of the grid voltage of an inner field-effect transistor of the control chip (U1) is adjusted to perform an average current control.

Description

说 明 书  Description
LED驱动电源 LED drive power
技术领域 Technical field
本发明涉及一种 LED驱动电源。 背景技术  The present invention relates to an LED driving power supply. Background technique
LED (发光二极管） 具有功耗小、 使用寿命长、 低成本等优点， 其被广泛 地应用于照明、 显示等领域， 如 LED照明灯、 LED显示屏、 LED灯饰等。 传统的 LED驱动电源通常釆用以下方案实现： 市电经过整流、 滤波后， 利 用脉宽调制 （ PWM )技术， 结合电压采样或电流采样电路反馈给 PWM主控芯 片， 实现电压或电流的稳定输出。 而传统的 LED驱动电源用二极管和电解电容 的填谷方式实现功率因数校正， 因为电解电容的使用而降低了 LED驱动电源的 使用寿命。 发明内容  LED (Light Emitting Diode) has the advantages of low power consumption, long service life and low cost. It is widely used in lighting, display and other fields, such as LED lighting, LED display, LED lighting and so on. The traditional LED driver power supply is usually implemented by the following schemes: After rectification and filtering, the utility power is pulsed-modulated (PWM) technology, combined with voltage sampling or current sampling circuit, and fed back to the PWM main control chip to achieve stable output of voltage or current. . The conventional LED driving power supply uses a diode and electrolytic capacitor filling method to achieve power factor correction, because the use of electrolytic capacitors reduces the service life of the LED driving power supply. Summary of the invention
本发明的目的在于提供一种可以提高使用寿命的 LED驱动电源。 本发明 LED驱动电源包括一比较器， 一光耦部分， 具有初级主绕组、 次级 主绕组、 初级辅助绕组、 次级辅助绕组的一变压器， 以及与初级主绕组、 初级 辅助绕组相连的一控制芯片， 所述次级主绕组通过一检测电阻与 LED负载的电 流检测端相连， 检测电阻将电流检测端检测到的 LED负载电流变化量转变为电 压变化量， 所述电压变化量通过比较器与一基准电压进行比较， 比较器的输出 通过光耦部分反馈到控制芯片的反馈回路功能控制脚， 反馈回路功能控制脚上 的电压与控制芯片的内部晶振电压进行比较， 从而调整控制芯片内部场效应管 的栅极电压占空比的幅宽以实行平均电流控制。 本发明 LED驱动电源通过反馈环路控制占空比的方式实现平均电流控制， 不需要加入电解电容， 能够在取得较大功率因数的前提下获得较长的使用寿命。 附图说明 It is an object of the present invention to provide an LED driving power source that can increase the service life. The LED driving power supply of the present invention comprises a comparator, an optocoupler portion, a transformer having a primary main winding, a secondary main winding, a primary auxiliary winding, a secondary auxiliary winding, and a control connected to the primary main winding and the primary auxiliary winding a chip, the secondary main winding is connected to a current detecting end of the LED load through a detecting resistor, and the detecting resistor converts the LED load current change amount detected by the current detecting end into a voltage change amount, and the voltage change amount is passed through the comparator A reference voltage is compared, the output of the comparator is fed back to the feedback loop function control pin of the control chip through the optocoupler part, and the voltage on the feedback loop function control pin is compared with the internal crystal oscillator voltage of the control chip, thereby adjusting the internal field effect of the control chip The width of the gate voltage duty cycle of the tube is used to perform average current control. The LED driving power source of the invention realizes the average current control by controlling the duty ratio through the feedback loop, and does not need to add the electrolytic capacitor, and can obtain a long service life under the premise of obtaining a large power factor. DRAWINGS
图 1是本发明 LED驱动电源的电路图。  BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a circuit diagram of an LED driving power supply of the present invention.
图 2是本发明 LED驱动电源的另一电路图。  Fig. 2 is another circuit diagram of the LED driving power supply of the present invention.
图 3是本发明 LED驱动电源的另一电路图。  Fig. 3 is another circuit diagram of the LED driving power supply of the present invention.
图 4是本发明 LED驱动电源的又一电路图。 具体实施方式  Figure 4 is a further circuit diagram of the LED driving power supply of the present invention. detailed description
下面结合附图和实施例对本发明作进一步说明。  The invention will now be further described with reference to the accompanying drawings and embodiments.
请参考图 1至图 4 , 本发明 LED驱动电源包括比较器 U6 , 光耦 OT1-A和 光耦 OT1-B组成的光耦部分， 具有初级主绕组 Tl-A、 次级主绕组 Tl-D、 初级 辅助绕组 Tl-B、 次级辅助绕组 T1-C的变压器 T1 , 以及控制芯片 U1。  Referring to FIG. 1 to FIG. 4, the LED driving power supply of the present invention comprises an optocoupler portion composed of a comparator U6, an optocoupler OT1-A and an optocoupler OT1-B, having a primary main winding Tl-A, a secondary main winding Tl-D, The primary auxiliary winding T1-B, the transformer T1 of the secondary auxiliary winding T1-C, and the control chip U1.
如图 1所示， LED驱动电源还包括一防电磁干扰部分， 其包括输入交流一 端连接保险丝 F1—端， 保险丝 F1另一端接电阻 R1和电容 C1的一端， 保险丝 F1和电阻 R1之间的节点连接共模电感 L1的一个绕组， 输入交流的另一端连接 电容 C1的另一端， 电容 C1的另一端连接共模电感 L1的另一绕组， 共模电感 L1连接整流桥 BRG1输入端， 整流桥 BRG1的输出端接电阻 R01—端， 电阻 R01另一端接电感 L2, 电感 L2另一端接电容 C2—端， 整流桥 BRG1输出端接 电容 C2的另一端。  As shown in FIG. 1, the LED driving power supply further includes an anti-electromagnetic interference portion, which includes an input AC terminal connected to the fuse F1-end, and the other end of the fuse F1 is connected to one end of the resistor R1 and the capacitor C1, and a node between the fuse F1 and the resistor R1. Connect one winding of the common mode inductor L1, the other end of the input AC is connected to the other end of the capacitor C1, the other end of the capacitor C1 is connected to the other winding of the common mode inductor L1, and the common mode inductor L1 is connected to the input end of the rectifier bridge BRG1, the rectifier bridge BRG1 The output terminal is connected to the resistor R01-terminal, the other end of the resistor R01 is connected to the inductor L2, the other end of the inductor L2 is connected to the capacitor C2-terminal, and the output terminal of the rectifier bridge BRG1 is connected to the other end of the capacitor C2.
如图 2所示， 控制芯片 U1 第 8脚内部集成场效应管的漏极， 第 1脚内部 集成场效应管的源极， 第 4脚内部集成场效应管的栅极。 控制芯片 U1第 1脚接 电阻 R12—端， 第 6脚连接初级辅助绕组 T1-B, 电阻 R12另一端接地， 控制芯 片 U1第 1脚和第 8脚并接电容 C5, 初级主绕组 T1-A与电容 C5串联形成谐振 网络， 电容 C5和控制芯片 U1第 1脚之间的连接点接电容 C6—端， 电容 C6的 另一端接控制芯片 U1第 3脚 OCP功能端。 As shown in FIG. 2, the drain of the FET is integrated in the 8th pin of the control chip U1, the source of the FET is integrated in the 1st pin, and the gate of the FET is integrated in the 4th pin. Control chip U1 pin 1 Resistor R12—terminal, pin 6 is connected to the primary auxiliary winding T1-B, and the other end of the resistor R12 is grounded. The first pin and the eighth pin of the control chip U1 are connected to the capacitor C5. The primary main winding T1-A and the capacitor C5 are connected in series to form a resonant network. The connection point between the capacitor C5 and the first leg of the control chip U1 is connected to the capacitor C6-terminal, and the other end of the capacitor C6 is connected to the OCP function terminal of the third pin of the control chip U1.
LED驱动电源还包括一防止准谐振误动作电路， 其包括初级辅助绕组 T1-B 一端接电阻 R7, 另一端接电阻 R12, 电阻 R7另一端接整流管 D3 , 电阻 R7和 电阻 D3连接点接二极管 D4的阳极， 二极管 D4的阴极接电阻 R9—端， 电阻 R9另一端接电容 C7—端和二极管 D5的阳极， 电容 C7另一端接电阻 R12。  The LED driving power supply further comprises a quasi-resonant malfunctioning circuit, which comprises a primary auxiliary winding T1-B connected to the resistor R7 at one end and a resistor R12 at the other end, the other end of the resistor R7 is connected to the rectifier D3, and the resistor R7 and the resistor D3 are connected to the diode. The anode of D4, the cathode of diode D4 is connected to the resistor R9-terminal, the other end of the resistor R9 is connected to the anode of the capacitor C7- terminal and the diode D5, and the other end of the capacitor C7 is connected to the resistor R12.
如图 3所示， 次级主绕组 T1-D—端接二极管 D2的阳极， 二极管 D2的阴极接 电容 C11的正极和电容 C12、 稳压管 Z3的一端， 次级主绕组 T1-D另一端接检测 电阻 R13 和二极管 D57的阴极， 二极管 D57的阳极、 检测电阻 R13与 LED负载的 电流检测端 -IS相连。 检测电阻 R13两端电压¾»57箝位在安全范围内， 保护检测 电阻 R13不被损坏。  As shown in FIG. 3, the secondary main winding T1-D is terminated with the anode of the diode D2, the cathode of the diode D2 is connected to the anode of the capacitor C11 and the capacitor C12, one end of the Zener Z3, and the other end of the secondary main winding T1-D. The detection resistor R13 and the cathode of the diode D57 are connected, and the anode of the diode D57 and the detecting resistor R13 are connected to the current detecting terminal -IS of the LED load. Sense resistor R13 voltage across the 3⁄4»57 clamp is within the safe range and the protection sense resistor R13 is not damaged.
如图 4所示， 参考电压 REF通过电阻 R23、 电阻 R24作用在电阻 R25、 电阻 R26 和电容 C17上的电压为基准电压。  As shown in Figure 4, the reference voltage REF is applied to the resistor R25, resistor R26, and capacitor C17 through resistor R23 and resistor R24 as the reference voltage.
图 2中的光耦 OT1-A与电阻 Rl 1、 电阻 R12串联于控制芯片 U1的第 4脚与地之 间。 图 4中的光耦 OT1-B与电阻 R30并联后再与电阻 R29串联于 5V电压与比较器 U6的输出之间。  The optocoupler OT1-A in Figure 2 is connected in series with the resistor Rl 1 and the resistor R12 between the fourth pin of the control chip U1 and the ground. The optocoupler OT1-B in Figure 4 is connected in parallel with resistor R30 and then in series with resistor R29 between the 5V voltage and the output of comparator U6.
检测电阻 R13将电流检测端 -IS检测到的 LED负载电流变化量转变为电压 变化量， 所述电压变化量通过比较器 U6与基准电压进行比较， 比较器 U6的输 出通过光耦 OT1 -A、 OT1 -B反馈到控制芯片 U1的第 4脚 （反馈回路功能控制 脚）， 反馈回路功能控制脚上的电压与控制芯片的内部晶振电压进行比较， 从而 调整控制芯片 Ul 内部场效应管的栅极电压占空比的 ON幅宽， 以实行平均电流 控制。 The detecting resistor R13 converts the LED load current change amount detected by the current detecting terminal -IS into a voltage change amount, the voltage change amount is compared with the reference voltage through the comparator U6, and the output of the comparator U6 passes through the optocoupler OT1 - A, OT1 -B is fed back to the fourth pin of the control chip U1 (feedback loop function control pin), and the voltage on the feedback loop function control pin is compared with the internal crystal oscillator voltage of the control chip, thereby The ON width of the gate voltage duty ratio of the internal FET of the control chip U1 is adjusted to perform average current control.
当 LED负载电流减小时， 电流检测端 -IS电压减小， 比较器 U6与电流检测端 -IS相连的一端的电压相对于基准电压减小的情况下， 流经光耦 OT1-B的电流减 小， 通过光耦 ΟΤ1-Α、 OT1-B反馈到控制芯片 Ul的电流也减小， 控制芯片 U1内 部场效应管的栅极电压占空比的 ON幅宽变窄， 电流峰值减小， 从而形成相应的 漏极电流峰值波形 （漏极电流峰值与输入电压成比例） ， 实现平均电流控制。  When the LED load current decreases, the current detection terminal -IS voltage decreases, and the current flowing through the optocoupler OT1-B decreases when the voltage at the end of the comparator U6 connected to the current detecting terminal -IS decreases relative to the reference voltage. Small, the current fed back to the control chip U1 through the optocoupler ΟΤ1-Α, OT1-B is also reduced, and the ON width of the gate voltage duty ratio of the internal FET of the control chip U1 is narrowed, and the current peak is reduced, thereby A corresponding drain current peak waveform (the drain current peak is proportional to the input voltage) is formed to achieve average current control.
当 LED负载电流增大时， 即电流检测端 -IS电压相对于比较器 U6的基准电压 增大的情况下， 与前述动作正好相反， 流经光耦 OT1-B的的电流增大， 通过光耦 ΟΤ1-Α、 OT1-B反馈到控制芯片 Ul的电流也增大， 控制芯片 U1内部场效应管的 栅极电压占空比的 ON幅宽变宽， 电流峰值增加 , 从而形成相应的漏极电流峰值 波形 （漏极电流峰值与输入电压成比例） , 实现平均电流控制。  When the LED load current is increased, that is, when the current detecting terminal -IS voltage is increased with respect to the reference voltage of the comparator U6, the current flowing through the optocoupler OT1-B is increased, and the passing light is increased. The current fed back to the control chip U1 is also increased, and the ON width of the gate voltage duty ratio of the internal field effect transistor of the control chip U1 is widened, and the current peak is increased to form a corresponding drain. The current peak waveform (the drain current peak is proportional to the input voltage) for average current control.
对于本领域的技术人员来说， 可根据以上描述的技术方案以及构思， 做出 其它各种相应的改变以及变形， 而所有的这些改变以及变形都应该属于本发明 权利要求的保护范围之内。  Various other changes and modifications may be made by those skilled in the art in light of the above-described technical solutions and concepts, and all such changes and modifications are intended to fall within the scope of the appended claims.

Claims

权 利 要 求 书 Claim
1、 一种 LED驱动电源， 其包括一比较器， 一光耦部分， 具有初级主绕组， 次级主绕组、 初级辅助绕组、 次级辅助绕组的一变压器， 以及与初级主绕组、 初级辅助绕组相连的一控制芯片， 所述次级主绕组通过一检测电阻与 LED负载 的电流检测端相连， 检测电阻将电流检测端检测到的 LED负载电流变化量转变 为电压变化量， 所述电压变化量通过比较器与一基准电压进行比较， 比较器的 输出通过光耦部分反馈到控制芯片的反馈回路功能控制脚， 反馈回路功能控制 脚上的电压与控制芯片的内部晶振电压进行比较， 从而调整控制芯片内部场效 应管的栅极电压占空比的幅宽以实行平均电流控制。  What is claimed is: 1. An LED driving power supply comprising a comparator, an optocoupler portion, a transformer having a primary main winding, a secondary main winding, a primary auxiliary winding, a secondary auxiliary winding, and a primary main winding, a primary auxiliary winding Connected to a control chip, the secondary main winding is connected to the current detecting end of the LED load through a detecting resistor, and the detecting resistor converts the LED load current change amount detected by the current detecting end into a voltage change amount, and the voltage change amount By comparing the comparator with a reference voltage, the output of the comparator is fed back to the feedback loop function control pin of the control chip through the optocoupler portion, and the voltage on the feedback loop function control pin is compared with the internal crystal oscillator voltage of the control chip, thereby adjusting the control The width of the gate voltage duty cycle of the internal FET of the chip is used to implement average current control.
2、 根据权利要求 1所述的 LED驱动电源， 其特征在于， 所述光耦部分包 括第一光耦 OT1-A和第二光耦 OT1-B, 所述第一光耦 OT1-A与电阻 Rl l、 电阻 R12串联于控制芯片的第 4脚与地之间， 所述第二光耦 OT1 -B与电阻 R30并联 后再与电阻 R29串联于 5V电压与比较器的输出之间。  2. The LED driving power supply according to claim 1, wherein the optocoupler portion comprises a first optocoupler OT1-A and a second optocoupler OT1-B, the first optocoupler OT1-A and the resistor Rl l, the resistor R12 is connected in series between the 4th pin of the control chip and the ground, and the second optocoupler OT1 - B is connected in parallel with the resistor R30 and then connected in series with the resistor R29 between the voltage of 5V and the output of the comparator.
3、 根据权利要求 1所述的 LED驱动电源， 其特征在于， 所述基准电压为 参考电压 REF通过电阻 R23、 电阻 R24作用在电阻 R25、 电阻 26和电容 C17 上的电压。  3. The LED driving power supply according to claim 1, wherein the reference voltage is a voltage at which a reference voltage REF acts on the resistor R25, the resistor 26, and the capacitor C17 through a resistor R23 and a resistor R24.
4、 根据权利要求 1所述的 LED驱动电源， 其特征在于， 所述 LED驱动电 源还包括一防电磁干扰部分， 其包括输入交流一端连接保险丝 F1—端， 保险丝 F1另一端接电阻 R1和电容 C1的一端，保险丝 F1和电阻 R1之间的节点连接共 模电感 L1的一个绕组， 输入交流的另一端接电容 C1的另一端， 电容 C1的另 一端连接共模电感 L1的另一绕组， 共模电感 L1连接整流桥 BRG1输入端， 整 流桥 BRG1的输出端接电阻 R01—端， 电阻 R01另一端接电感 L2， 电感 L2另 一端接电容 C2—端， 整流桥 BRG 1输出端接电容 C2的另一端。  4. The LED driving power supply according to claim 1, wherein the LED driving power source further comprises an anti-electromagnetic interference portion, comprising: an input AC terminal connected to the fuse F1-end, and a fuse F1 connected to the resistor R1 and the capacitor at the other end. One end of C1, the node between the fuse F1 and the resistor R1 is connected to one winding of the common mode inductor L1, the other end of the input AC is connected to the other end of the capacitor C1, and the other end of the capacitor C1 is connected to the other winding of the common mode inductor L1. The mode inductor L1 is connected to the input end of the rectifier bridge BRG1, the output end of the rectifier bridge BRG1 is connected to the resistor R01-end, the other end of the resistor R01 is connected to the inductor L2, the other end of the inductor L2 is connected to the capacitor C2-terminal, and the output of the rectifier bridge BRG 1 is connected to the capacitor C2. another side.
5、根据权利要求 1所述的 LED驱动电源，其特征在于，所述控制芯片 U1 第 8脚内部集成场效应管的漏极， 第 1脚内部集成场效应管的源极， 所述控制芯片 U1第 1脚接电阻 R12—端， 电阻 R12另一端接地， 控制芯片 U1第 1脚和第 8 脚并接电容 C5 ,初级主绕组 T1-A与电容 C5串联形成谐振网络， 电容 C5和控 制芯片 U1第 1脚之间的连接点接电容 C6—端， 电容 C6的另一端接控制芯片 U1第 3脚 OCP功能端。 5. The LED driving power supply according to claim 1, wherein said control chip U1 is The 8-pin internal integrated FET drain, the first leg internally integrates the source of the FET, the first chip of the control chip U1 is connected to the resistor R12-terminal, the other end of the resistor R12 is grounded, and the control chip U1 pin 1 and The 8th pin is connected to the capacitor C5. The primary main winding T1-A and the capacitor C5 are connected in series to form a resonant network. The connection point between the capacitor C5 and the first leg of the control chip U1 is connected to the capacitor C6-end, and the other end of the capacitor C6 is connected to the control chip. U1 3rd foot OCP function.
6、 根据权利要求 1所述的 LED驱动电源， 其特征在于， 所述 LED驱动电 源还包括一防止准谐振误动作电路， 其包括初级辅助绕组 T1-B—端接电阻 R7, 另一端接电阻 R12 , 电阻 R7另一端接整流管 D3 , 电阻 R7和电阻 D3连接点接 二极管 D4的阳极， 二极管 D4的阴极接电阻 R9—端， 电阻 R9另一端接电容 C7—端和二极管 D5的阳极， 电容 C7另一端接电阻 R12。  6. The LED driving power supply according to claim 1, wherein the LED driving power source further comprises a quasi-resonant malfunctioning circuit including a primary auxiliary winding T1-B-terminal resistance R7, and the other end resistor R12, the other end of the resistor R7 is connected to the rectifier D3, the resistor R7 and the resistor D3 are connected to the anode of the diode D4, the cathode of the diode D4 is connected to the resistor R9- terminal, the other end of the resistor R9 is connected to the capacitor C7-end and the anode of the diode D5, the capacitor The other end of C7 is connected to resistor R12.
7、 根据权利要求 1所述的 LED驱动电源， 其特征在于， 所述次级主绕组 T1-D一端接二极管 D2的阳极，二极管 D2的阴极接电容 C11的正极和电容 C12, 稳压管 Z3的一端， 次级主绕组 T1-D另一端接检测电阻 R13 和二极管 D57的 阴极， 二极管 D57的阳极与 LED负载的电流检测端 -IS相连。  7. The LED driving power supply according to claim 1, wherein one end of the secondary main winding T1-D is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the positive electrode of the capacitor C11 and the capacitor C12, and the Zener diode Z3. At one end, the other end of the secondary main winding T1-D is connected to the cathode of the detecting resistor R13 and the diode D57, and the anode of the diode D57 is connected to the current detecting terminal -IS of the LED load.
PCT/CN2010/080591 2010-11-26 2010-12-31 Led driving power supply WO2012068765A1 (en)

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