WO2014075383A1 - 一种多路led驱动电路 - Google Patents

一种多路led驱动电路 Download PDF

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Publication number
WO2014075383A1
WO2014075383A1 PCT/CN2013/001201 CN2013001201W WO2014075383A1 WO 2014075383 A1 WO2014075383 A1 WO 2014075383A1 CN 2013001201 W CN2013001201 W CN 2013001201W WO 2014075383 A1 WO2014075383 A1 WO 2014075383A1
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Prior art keywords
circuit
led
transformer
control
voltage
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English (en)
French (fr)
Inventor
周明兴
王镜铭
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Opple Lighting Co Ltd
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Opple Lighting Co Ltd
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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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

Definitions

  • the present invention relates to a driving circuit, and more particularly to a driving circuit for a multi-channel LED. Background technique
  • LED (Light Emitting Diode) lamp has the advantages of long life, high luminous efficiency, impact resistance, low energy consumption, etc. It belongs to green energy-saving and environmental protection lighting, and has been widely used in the field of lighting and decoration, and with the encouragement and promotion of governments. LED lights are becoming more and more popular and there is a tendency to gradually replace traditional lighting.
  • the LED light source of the LED lamp needs a driving circuit to illuminate, and the LED light source is connected to the driving circuit.
  • the driving circuit is usually an integrated circuit, and an integrated chip is connected to the LED light source to achieve constant current.
  • the driving circuit is usually an integrated circuit, and an integrated chip is connected to the LED light source to achieve constant current.
  • a multi-channel LED driving circuit includes a control circuit, a reference circuit, and a multi-channel LED circuit, the reference circuit provides a reference voltage for the multi-channel LED circuit, and the reference circuit And each of the plurality of LED circuits has a triode, and a base of the triode of the reference circuit is connected to a base of a triode of each of the plurality of LED circuits, so that the multi-channel LED circuit
  • the reference voltage of each branch is consistent with the reference voltage of the reference circuit, and the emitter of the triode of each branch of the multi-channel LED circuit is connected to the control resistor, and by setting the control resistor, Multi-channel LED circuit Each branch passes the LED current to its desired value.
  • the invention of the multi-channel LED driving circuit has the following advantages: The current can be adjusted, the LED branch can be increased or decreased, the circuit protection is strong, and the branch current can be set to meet different requirements. DRAWINGS
  • FIG. 1 is a schematic diagram of a multi-channel LED driving circuit of the present invention.
  • FIG. 2 is a circuit diagram of a multi-channel LED driving circuit of the present invention. detailed description
  • the multiplex LED driver circuit 500 of the present invention includes a control circuit 100, a reference circuit 200, and a multiplex LED circuit 300.
  • the reference circuit 200 supplies a voltage to the multiplex LED circuit 300 after applying a voltage.
  • Each of the reference circuit 200 and the multiplex LED circuit 300 has a transistor Q2, Q3, Q4, and the reference circuit 200 and the multiplex LED circuit 300 make the multiplex LED circuit 300 through the base-connected transistors Q2, Q3, Q4. Consistent with the reference voltage of the reference circuit 200, by setting the required resistors R4, R5, R6 for the reference circuit 200 and the multiplex LED circuit 300, each LED circuit reaches its required current.
  • the control circuit 100 includes a control integrated circuit 101 and a transformer L1.
  • the transformer L1 includes at least a first portion 102 that supplies a voltage to the reference circuit 200 and a second portion 103 that forms a loop with the reference circuit 200 and the multiplexed LED circuit 300.
  • the first portion 102 of the transformer L1 supplies a voltage to the reference circuit 200 through a circuit comprising a diode D1 and a filter capacitor C2 such that when the control circuit 100 is turned off, the reverse voltage of the first portion 102 of the transformer L1 is not loaded on the reference circuit 200.
  • the control integrated circuit has at least first, second, and third pins &, b, c.
  • the control circuit 100 further includes a field effect transistor Q1 connected to the second pin b of the control integrated circuit 101, and a resistor R7 connected in series with the first pin a of the control integrated circuit 101 and the field effect transistor Q1.
  • the transformer L1 is connected to the third pin c of the control integrated circuit 101.
  • the first portion 102 of the electric circuit of the reference circuit 200 determines that the reference circuit 200 further includes a voltage drop resistor R1 connected to the collector of the diode Q2, and the current voltage of the reference circuit 200 and the multiplex LED circuit 300 is controlled by a voltage drop.
  • the resistor R1 is adjusted.
  • the reference circuit 200 and each of the LED circuits respectively include control resistors R4, R5, and R6 connected to the emitters of the transistors Q2, Q3, and Q4, and the different currents required for different branches are set by setting the control resistors R4, R5, and R6. .
  • the reference circuit 200 includes, in order, a voltage drop resistor R1, a transistor Q2 connected to the voltage drop resistor R1, and a control resistor R4.
  • Each LED circuit in turn includes an LED, a triode Q3 that connects the LEDs, and a control resistor R5 or R6 that connects the triodes.
  • the first portion 102 and the second portion 103 of the transformer L1 include three pins 1, 2, 3.
  • the first pin 1 of the transformer L1 is connected to the multiplex LED circuit 300 via a diode D6, and the field effect transistor Q1 is connected to the first pin 1 of the transformer L1 to control the transformer L1.
  • the filter capacitor C2 is connected to the second pin 2 of the transformer L1, and the diode D1 is connected to the third pin 3 of the transformer L1.
  • the control circuit 100 further includes a capacitor Cl having one end connected in parallel with the reference point 200 and one end of the control resistor of the multiplex LED circuit 300 to the second pin 2 of the transformer L1.
  • the other end of the capacitor C1 is connected in parallel with one end of each of the LEDs D2, D3, D4, and D5 of the multiplex LED circuit 300 to the diode D6.
  • the voltage of the reference circuit 200 may not be provided by the transformer L1, but a voltage is directly applied through the DC power source, and the reference voltage required by the reference circuit 200 is reached by selecting an appropriate voltage drop resistor R1.
  • the multi-channel LED driving circuit 500 of the present invention is a multi-channel LED constant current driving circuit, which includes a control circuit 100, a reference circuit 200, and a multi-channel LED circuit 300.
  • the control circuit 100 is a buck control circuit, including a transformer L1, a control integrated circuit 101, a field effect transistor Q1 connected to the second pin c of the control integrated circuit 101, a first pin a of the control integrated circuit 101, and a field effect transistor Q1. Connect the resistor R7 in series.
  • the third pin c of the control integrated circuit is connected to the transformer L1 to provide the input voltage of the transformer L1.
  • the transformer LI includes the second, third, third, fourth, and fifth pins 1, 2, 3, 4, 5 c.
  • the reference circuit 200 and the multi-way LED circuit 300 are connected in parallel to the second connection of the transformer L1 of the control circuit 100.
  • the foot 2 is changed to 11 (the first and third pins 1 and 3 of the device L1 are respectively connected to the other end of the reference circuit 200 and the multi-channel LED circuit 300.
  • the fourth pin 4 of the transformer L1 is grounded, and the fifth pin 5 is connected.
  • the third pin c of the integrated circuit 101 is controlled.
  • the first pin 1 of the transformer L1 is connected in parallel with the field effect transistor Q1 of the control circuit 100 to an inductor L2, and then connected to a diode D6 and then connected to the multiplex LED circuit 300 via the wire 10.
  • the multiplex LED driver circuit 500 also includes a capacitor Cl.
  • the capacitor C1 is connected across the control circuit 100 and the second pin 2 of the transformer L1.
  • the reference circuit 200 includes a diode D1 whose one end is connected to the third pin 3 of the transformer L1 and a capacitor C2 which is connected in parallel to the other end of the diode D1 and a voltage regulating circuit 201.
  • the voltage regulating circuit 201 includes a voltage drop resistor R1, a control resistor R4, and a transistor Q2 between the voltage drop resistor R1 and the control resistor R4.
  • the resistor R4 regulates the current of the reference circuit 200.
  • the capacitor C2 and the voltage regulating circuit 201 are connected in parallel to the second pin 2 of the transformer L1, respectively.
  • the base of the transistor Q2 of the reference circuit 200 is connected to the multiplex LED circuit 300.
  • the multiplex LED circuit 300 includes a plurality of branches. Taking one of the roads as an example, each path includes a transistor Q3, a resistor R2 connected at one end to the base of the transistor Q3, LEDs D2 and D3 connected to the collector of the transistor Q3, and a control resistor R5 connected to the emitter of the transistor Q3. The other end of the base resistor R2 is connected between the collector of the transistor Q3 and the LEDs D2 and D3. In this embodiment, only two branches are designed, but in other embodiments, the number of branches can be increased as needed.
  • the base of the transistor Q2 of the reference circuit 200 is connected to the bases of the transistors Q3, Q4 of each of the branches of the multiplexed LED circuit.
  • the other ends of the resistors R5 and R6 connected to the emitters of the transistors Q3 and Q4 of each branch are connected in parallel to the second pin 2 of the transformer.
  • the control integrated circuit 101, the field effect transistor Q1, the transformer L1, the diode D6, and the resistor R7 constitute a step-down circuit, and the field effect transistor Q1 is made by using a chip whose critical operation of the step-down circuit is critical.
  • the current effective value of the main path is the sum of the currents desired to flow through each branch, ensuring that the entire circuit does not appear in the course of operation. A large current of a desired current value flows to cause damage to the LED.
  • the buck circuit when the FET Q1 is turned on, the current flows through the LED and then charges the inductor.
  • the transformer L1 When the FET Q1 is turned off, the transformer L1 is discharged through the loop of L2, D6, and LED to ensure that the LED operates in continuous mode. Therefore, there is no visible flicker in the LED work project that affects the human senses, and there is no visible current interruption caused by the naked eye to affect the LED color. During the conduction of the LED, the current flowing through the LED remains constant, so that the light emitted by the LED is constant, and no chromaticity (color) changes.
  • the secondary circuit formed by R4, R5, R6 and LED is actually the load part of the step-down circuit described above, so the total current flowing in this part is controlled by the main path of the step-down circuit.
  • the proportional current sources are formed by transistors Q2, Q3, Q4 and control resistors R4, R5, and R6.
  • resistors R2 and R3 provide sufficient bias current for transistors Q3 and Q4 to turn on transistors Q3 and Q4.
  • the circuit can be started smoothly, and current flows through inductor L1 to make pin 2 of L1.
  • the winding between the three generates an induced voltage
  • the capacitor C2 filters the voltage of the voltage drop resistor R1, the transistor Q2, and the control resistor R4 to generate a reference current Ir4 and a base current Ibq3, Ibq4 that maintains the conduction of Q3 and Q4.
  • the resistance of R6 can be set to determine the current Ir6 of LEDD4 and D5.
  • the invention applies the reference current 200 constant voltage to control the current of each branch of the multi-channel LED circuit, so that each LED branch is not connected with a separate control circuit to drive the LED, and the LED circuit can achieve the purpose of constant current, the circuit Simple and cost effective.
  • the LED branch can be added, and only a suitable control resistor needs to be set.
  • the LED branch of more roads can be controlled by the invention ⁇

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

本发明公开了一种多路LED驱动电路，包括控制电路、基准电路以及多路LED电路，所述基准电路为所述多路LED电路提供一基准电压，所述基准电路和多路LED电路的每一支路都分别具有三极管，所述基准电路的三极管的基极和所述多路LED电路的每一支路的三极管的基极相连，使得所述多路LED电路的每一支路的基准电压与所述基准电路的基准电压保持一致，所述多路LED电路的每一支路的三极管的发射极连接控制电阻，通过对所述控制电阻的设置，所述多路LED电路的每一支路通过LED的电流达到其所需要的值。

Description

一种多路 LED驱动电路
技术领域
本发明是涉及一种驱动电路， 尤其指一种多路 LED的驱动电路。 背景技术
LED ( Light Emitting Diode) 灯具有寿命长、 光效高、 抗冲击、 低能耗 等等优点， 属于绿色的节能环保照明， 现已广泛应用于照明与装饰领域， 并 且随着各国政府的鼓励和推广， LED灯越来越普及且有逐渐替换传统照明的 趋势。
LED灯的 LED光源需要驱动电路来点亮， LED光源会与驱动电路相连。 现有技术中， 驱动电路通常为集成电路， 通过一集成芯片连接到 LED光源 实现恒流。 当 LED光源为多颗时， 有时需要多路 LED光源共同作用来提供 需要的色温、 亮度等。 然而现有技术中， 如果每路 LED光源都连接一驱动 集成电路则会使得电源驱动电路成本过高。
因此， 为了克服上述缺陷， 有必要提供一种改进的多路 LED驱动电路。 发明内容
本发明的目的在于提供一种成本低、 效率高的多路 LED驱动电路。 为了实现上述目的， 本发明采用如下技术方案： 一种多路 LED驱动电 路，包括控制电路、基准电路以及多路 LED电路，所述基准电路为多路 LED 电路提供一基准电压， 所述基准电路和多路 LED电路的每一支路都分别具 有三极管， 所述基准电路的三极管的基极和所述多路 LED电路的每一支路 的三极管的基极相连， 使得所述多路 LED电路的每一支路的基准电压与所 述基准电路的基准电压保持一致， 所述多路 LED电路的每一支路的三极管 的发射极连接控制电阻， 通过对所述控制电阻的设置， 所述多路 LED电路 的每一支路通过 LED的电流达到其所需要的值。
相较于现有技术， 木发明多路 LED驱动电路有以下优点： 具有电流可 调性好， LED支路可增减， 电路保护性强， 可设置支路电流不同以满足不同 要求。 附图说明
图 1为本发明多路 LED驱动电路的示意图。
图 2为本发明多路 LED驱动电路的电路图。 具体实施方式
参照图 1和图 2所示，本发明多路 LED驱动电路 500包括控制电路 100、 基准电路 200以及多路 LED电路 300， 基准电路 200加载一电压后为多路 LED电路 300提供一基准电压。 基准电路 200和多路 LED电路 300的每一 支路都分别具有三极管 Q2、 Q3、 Q4， 基准电路 200和多路 LED电路 300 通过基极相连的三极管 Q2、 Q3、 Q4使得多路 LED电路 300与基准电路 200 的基准电压保持一致， 通过为基准电路 200与多路 LED电路 300设置所需 的电阻 R4、 R5、 R6， 使得每路 LED电路达到其需要的电流。
控制电路 100包括控制集成电路 101和变压器 Ll。变压器 L1至少包括 为基准电路 200提供电压的第一部分 102以及与基准电路 200、多路 LED电 路 300形成回路的第二部分 103。 变压器 L1的第一部分 102通过一二极管 D1和滤波电容 C2组成的电路为基准电路 200提供电压， 使得控制电路 100 关闭时，变压器 L1的第一部分 102的反向电压不会加载在基准电路 200上。 控制集成电路至少具有第一、 第二、 第三接脚&、 b、 c。 控制电路 100还包 括与控制集成电路 101第二接脚 b连接的场效应晶体管 Ql、 以及控制集成 电路 101的第一接脚 a与场效应晶体管 Q1连接后再串联的电阻 R7。变压器 L1连接控制集成电路 101的第三接脚 c。 基准电路 200的电 i山变 ik器 L1的第- 部分 102决定， 基准电路 200 还包括与二极管 Q2集电极相连的压降电阻 R1， 基准电路 200与多路 LED 电路 300的电流电压由压降电阻 R1调节。基准电路 200和每路 LED电路分 别都包括与三极管 Q2、 Q3、 Q4的发射极连接的控制电阻 R4、 R5、 R6， 通 过设置控制电阻 R4、 R5、 R6来达到不同支路所需的不同电流。基准电路 200 依次包括压降电阻 Rl、 与压降电阻 R1连接的三极管 Q2以及控制电阻 R4。 每路 LED电路依次包括 LED、 连接 LED的三极管 Q3以及连接三极管的控 制电阻 R5或者 R6。
变压器 L1的第一部分 102和第二部分 103包括三个接脚 1、 2、 3。 变 压器 L1的第一接脚 1通过一二极管 D6与多路 LED电路 300连接， 场效应 晶体管 Q1连接变压器 L1的第一接脚 1以控制变压器 Ll。 滤波电容 C2接 变压器 L1的第二接脚 2， 二极管 D1接变压器 L1的第三接脚 3。
控制电路 100还包括一端与基准点路 200和多路 LED电路 300的控制 电阻一端共同并联到变压器 L1的第二接脚 2的电容 Cl。 电容 C1另一端与 多路 LED电路 300的每一支路的 LEDD2、 D3、 D4、 D5的一端共同并联连 接到二极管 D6。
其他实施例中， 基准电路 200的电压也可以不通过变压器 L1提供， 而 通过一直流电源直接加载一电压， 通过选用适当的压降电阻 R1来达到基准 电路 200所需的基准电压。
具体的， 参照图 2所示， 本发明多路 LED驱动电路 500为多路 LED恒 流驱动电路， 其包括控制电路 100、 基准电路 200以及多路 LED电路 300。
控制电路 100为降压控制电路， 包括变压器 Ll、 控制集成电路 101、 与 控制集成电路 101第二接脚 c连接的场效应晶体管 Ql、 控制集成电路 101 的第一接脚 a与场效应晶体管 Q1连接后串联的电阻 R7。控制集成电路的第 三接脚 c连接变压器 L1 以提供变压器 L1的输入电压。 变压器 LI包括第 、 第二、 第三、 第四、 第五接脚 1、 2、 3、 4、 5 c 基准电路 200和多路 LED电路 300并联接入控制电路 100的变压器 L1的第 二接脚 2， 变 11(器 L1的第一、 第三接脚 1、 3分别连接基准电路 200和多路 LED电路 300的另一端。 变压器 L1的第四接脚 4接地， 第五接脚 5连接控 制集成电路 101的第三接脚 c。
变压器 L1的第一接脚 1与控制电路 100的场效应晶体管 Q1并联到一 电感 L2,然后连接一二极管 D6后再通过导线 10与多路 LED电路 300连接。 多路 LED驱动电路 500还包括电容 Cl。 该电容 C1跨接控制电路 100以及 变压器 L1的第二接脚 2。
基准电路 200包括一端与变压器 L1的第三接脚 3连接的二极管 D1以 及并联连接二极管 D1另一端的电容 C2以及电压调节电路 201。电压调节电 路 201包括压降电阻 R1、控制电阻 R4以及位于压降电阻 R1和控制电阻 R4 之间的三极管 Q2， 电阻 R4调节基准电路 200电流。 电容 C2和电压调节电 路 201分别并联连接所述变压器 L1的第二接脚 2。 基准电路 200的三极管 Q2的基极连接多路 LED电路 300。
多路 LED电路 300包括多个支路。 以其中一支路为例， 每一支路包括 一个三极管 Q3、 一端与三极管 Q3基极连接的电阻 R2、 与三极管 Q3集电 极连接的 LEDD2、 D3以及与三极管 Q3发射极连接的控制电阻 R5， 基极的 电阻 R2另一端连接三极管 Q3的集电极与 LEDD2、 D3之间。本实施例中只 设计了两个支路， 但其他实施例中， 可以根据需要增加支路的数量。 基准电 路 200的三极管 Q2的基极与所述多路 LED电路的每一支路的三极管 Q3、 Q4的基极相连。 每一支路的三极管 Q3、 Q4的发射极连接的电阻 R5、 R6 的另一端并联接入变压器的第二接脚 2。
首先， 控制集成电路 101、 场效应晶体管 Ql、 变压器 Ll、 二极管 D6、 电阻 R7组成了降压电路，使用降压电路临界工作的芯片使场效应晶体管 Q1 工作在 TP关状态， 通过检测 阻 R7上的电 Hi峰值信 控制^通路， 主通路 的电流有效值为各个支路所希望流过电流的和， 确保整个电路在工作的过程 中不会出现超过所需电流值的大电流流过从而对 LED造成损害。 降压电路 工作时， 场效应晶体管 Q1开通时电流流过 LED后对电感进行充电， 当场效 应晶体管 Q1关闭时， 变压器 L1会经由 L2、 D6、 LED的回路进行放电， 确 保 LED工作在连续模式， 所以 LED工作工程中不会出现肉眼可见闪烁影响 人体感官， 也不会出现肉眼不可见的电流间断影响 LED显色。 在 LED导通 期间， 流经 LED的电流保持恒定， 使 LED发射的光恒定， 则无色度 (色彩） 变化。
然后由二极管 Dl、 电容 C2、 三极管 Q2、 Q3、 Q4、 电阻 Rl、 R2、 R3、
R4、R5、R6和 LED构成的二级电路实际为前面描述的降压电路的负载部分， 所以本部分流过的总电流受控于降压电路主通路。 在本部分电路中， 由三极 管 Q2、 Q3、 Q4、 控制电阻 R4、 R5、 R6构成了比例电流源。 在电路启动的 第一个周期， 电阻 R2、 R3为三极管 Q3、 Q4提供足够的偏置电流使三极管 Q3、 Q4导通， 电路能够顺利启动， 电流流过电感 Ll， 使 L1的接脚 2、 3之 间的绕组产生感应电压， 经过电容 C2滤波为压降电阻 Rl、 三极管 Q2、 控 制电阻 R4的通路提供电压， 从而产生一个基准电流 Ir4和维持 Q3、 Q4导通 的基极电流 Ibq3、 Ibq4。 由于比例电流源的特性 UQ2be+Ur4= UQ3be+Ur5， 而 UQ2be^UQ3be， 可知 R4*Ir4= R5*Ir5。 我们可以根据基准电流 Ir4调节 R4、 R5得到所需的 Ir5， 从而控制 LEDD2、 D3通路在 Ir5。 同理可设置 R6 的阻值以确定 LEDD4, D5通路的电流 Ir6。
本发明应用基准电流 200恒压来控制多路 LED电路每一支路的电流， 使得无需每一 LED支路都连接一单独的控制电路来驱动 LED, 又能达到 LED电路恒流的目的， 电路简单且节省成本。
其他实施例中， 可以增加 LED支路， 只需要设置合适的控制电阻， 则 可以通过本发明控制更多路的 LED支路 <

Claims

权利要求
1. -- -种多路 LED驱动电路， 包括控制电路以及多路 LED电路， 其特 征在于： 所述多路 LED驱动电路还包括一基准电路， 所述基准电路为多路 LED电路提供一基准电压， 所述基准电路和多路 LED电路的每一支路都 分别具有三极管，所述基准电路的三极管的基极和所述多路 LED电路的每 一支路的三极管的基极相连，使得所述多路 LED电路的每一支路的基准电 压与所述基准电路的基准电压保持一致，所述多路 LED电路的每一支路的 三极管的发射极连接控制电阻， 通过对所述控制电阻的设置， 所述多路 LED电路的每一支路通过 LED的电流达到其所需要的值。
2. 如权利要求 1所述的多路 LED驱动电路， 所述控制电路包括变压 器， 所述变压器至少包括为所述基准电路提供电压的第一部分以及与所述 多路 LED电路形成回路的第二部分。
3. 如权利要求 2所述的多路 LED驱动电路， 所述基准电路包括电压 调节电路， 二极管和滤波电容， 所述变压器的第一部分通过所述二极管和 滤波电容为所述电压调节电路提供电压， 使得所述控制电路关闭时， 所述 变压器的第一部分的反向电压不会加载在所述基准电路上。
4. 如权利要求 3所述的多路 LED驱动电路， 所述基准电路的电压由 所述变压器的第一部分决定， 所述基准电路还包括与所述三极管的集电极 相连的压降电阻，所述基准电路与多路 LED电路的电流电压由压降电阻调 节。
5. 如权利要求 2所述的多路 LED驱动电路， 所述变压器包括第一、 第二、第三接脚， 所述基准电路和多路 LED电路并联接入控制屯路的变压 器的第二接脚，变压器的另两个接脚分别连接基准电路和多路 LED电路的 山
另 而。
6. 如权利要求 5所述多路 LED驱动电路， 所述控制电路包括控制集 成电路、 与所述控制集成电路第一接脚连接的场效应晶体管、 以及电阻， 所述电阻与控制集成电路的第二接脚和所述场效应晶体管并联组成的电路 串联， 所述变压器连接控制集成电路的第三接脚。
7. 如权利要求 6所述多路 LED驱动电路， 所述变压器的第一接脚与 所述场效应晶体管并联到一个二极管， 然后再与多路 LED电路连接。
8.如权利要求 7所述多路 LED驱动电路， 还包括与基准电路和多路 LED电路的控制电阻一端共同并联到所述变压器的第二接脚的电容， 所述 电容另一端与所述多路 LED电路的每一支路的 LED的一端共同并联连接 所述二极管的另一端， 其中所述二极管的另一端连接所述变压器的第一接 脚的二极管。
9. 如权利要求 5所述多路 LED驱动电路， 所述电容、 基准电路的控 制电阻和所述多路 LED电路的每一支路的控制电阻分别并联连接所述变 压器的第二接脚。
10.如权利要求 1所述多路 LED驱动电路， 所述基准电路通过直流电 源加载一电压。
PCT/CN2013/001201 2012-11-15 2013-10-08 一种多路led驱动电路 Ceased WO2014075383A1 (zh)

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