WO2013127031A1 - 一种led驱动装置及其控制方法 - Google Patents

一种led驱动装置及其控制方法 Download PDF

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Publication number
WO2013127031A1
WO2013127031A1 PCT/CN2012/000415 CN2012000415W WO2013127031A1 WO 2013127031 A1 WO2013127031 A1 WO 2013127031A1 CN 2012000415 W CN2012000415 W CN 2012000415W WO 2013127031 A1 WO2013127031 A1 WO 2013127031A1
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WO
WIPO (PCT)
Prior art keywords
circuit
led
terminal
capacitor
resistor
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PCT/CN2012/000415
Other languages
English (en)
French (fr)
Inventor
张虹
辜小斌
吴孝明
陈来剑
Original Assignee
苏州浩森电子科技有限公司
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Application filed by 苏州浩森电子科技有限公司 filed Critical 苏州浩森电子科技有限公司
Priority to EP12826615.2A priority Critical patent/EP2822362A1/en
Priority to US13/811,907 priority patent/US20150022100A1/en
Priority to KR1020137003681A priority patent/KR20140092223A/ko
Priority to JP2014501403A priority patent/JP2014509456A/ja
Publication of WO2013127031A1 publication Critical patent/WO2013127031A1/zh

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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]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • 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
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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 a driving circuit and a control method thereof, and more particularly to an LED driving device and a control method thereof. Background technique
  • LED Light Emitting Diode
  • the heart of the LED is a semiconductor wafer.
  • One end of the wafer is attached to a holder, one end is a negative pole, and the other end is connected to the positive pole of the power supply, so that the entire wafer is encapsulated by epoxy resin.
  • the semiconductor wafer consists of two parts, a part of which is a P-type semiconductor, in which the hole dominates, and the other end is an N-type semiconductor, which is mainly electrons here. But when the two semiconductors are connected, they form a P-N junction. When a current is applied to the wafer through the wire, the electrons are pushed toward the P region.
  • the electrons recombine with the holes, and then the energy is emitted in the form of photons.
  • This is the principle of LED illumination.
  • the wavelength of light also the color of light, is determined by the material that forms the P-N junction.
  • LED driving devices on the market have problems such as insufficient brightness, high power, poor heat dissipation, fast light attenuation, and high cost. Therefore, it is necessary to improve the LED driving device and its control method to reduce power consumption and increase brightness. Summary of the invention
  • the technical problem to be solved by the present invention is to provide an LED driving device and a control method thereof, which can improve the heat dissipation effect, reduce power consumption, and improve brightness.
  • the technical solution adopted by the present invention to solve the above technical problem is to provide an LED driving device, including a power conversion unit, a micro processing controller, and an LED circuit, wherein the power conversion unit includes a pulse transformer and a switch control circuit, The primary winding on the input side of the pulse transformer is connected through a switch control circuit and a rectification filter circuit, and the secondary winding and the auxiliary winding on the output side are connected to the power supply end of the microprocessor controller through a constant voltage control circuit, and the output end of the microprocessor controller Connected to the LED circuit.
  • the rectifying and filtering circuit includes a front-stage capacitor CX1, a rectifier bridge BD1, and a primary-shaped filter circuit, and the primary-shaped filter circuit is composed of a capacitor C1, a capacitor C2, and an inductor L1.
  • the switch control circuit includes a main control switching frequency chip, and the drain terminal D of the main control switching frequency chip is connected to a surge absorption circuit, and the surge absorption circuit is composed of a capacitor C3 and a resistor R4. And diode D4, the two ends of the surge absorbing circuit are connected to both ends of the primary winding of the pulse transformer.
  • the constant voltage control circuit includes a regulated output circuit and an auxiliary voltage control circuit; the positive terminal Vo+ of the regulated output circuit passes through the inductor L3, the rectifier D6, and the secondary winding of the pulse transformer. One end is connected, the negative end Vo- is connected to the other end of the secondary winding of the pulse transformer, and a filter circuit composed of a resistor R6 and a capacitor C8 is connected in parallel across the rectifier D6, and both ends of the inductor L3 pass the output filter capacitor C6.
  • the output end of the rectifier D6 is connected to the output terminal of the photocoupler U2 through the constant voltage regulator tube VR2, the input end of the photocoupler U2 and the main control switch
  • the output terminal FB of the frequency chip is connected;
  • the auxiliary voltage control circuit is composed of a diode D5, a capacitor C4 and a resistor R5, and the diode D5, the capacitor C4 and the auxiliary winding of the pulse transformer are connected at both ends to form a closed loop, and the capacitor C4 One end is connected to the bypass terminal BP of the main control switching frequency chip through the resistor R5, and the other end is grounded; the main control switch frequency core Bypass BP terminal through the capacitor C5 is grounded.
  • the power supply terminal Vcc of the microprocessor controller is connected to the positive terminal Vo+ of the regulated output circuit through the three-terminal regulator, and allows the enable terminal K to pass the pulse level judgment circuit and the regulated output.
  • the circuit is connected, and the pulse level judging circuit is composed of a diode D1 and resistors R1 and R2. The diode D1 and the resistor R2 are connected in parallel and then connected in series with the resistor R1.
  • the output end of the microprocessor controller is connected to the LED circuit through a plurality of sets of constant current control circuits composed of double triodes, and each group of constant current control circuits drives one LED circuit.
  • the LED circuit comprises three LED strings of CL1, CL2 and CL3, and each LED string is formed by connecting a plurality of LEDs in parallel.
  • the present invention further provides a control method for the above LED driving device, which comprises the following steps: a) a power conversion unit collects a switching signal of a mechanical switch control lamp; b) a microprocessor controller receives a power conversion unit from the power conversion unit. Switching the signal, and outputting a control signal to control the LED circuit on or off.
  • the control method of the LED driving device wherein the switching signal has an ON/OFF time interval of 0.1 to 6 seconds, and the microprocessor controller receives the switching signal from the power conversion unit through the pulse level determining circuit.
  • the pulse level judging circuit is composed of a diode D1, resistors R1 and R2, and the diode D1 and the resistor R2 are connected in parallel and then connected in series with the resistor R1.
  • the present invention has the following beneficial effects:
  • the LED driving device and the control method thereof provided by the invention use the switch control circuit to collect the switching signal of the mechanical lamp, and drive the LED circuit to perform dimming through the micro-processing controller, thereby improving Cooling effect, reducing power consumption and increasing brightness.
  • FIG. 1 is a block diagram showing the circuit of an LED driving device of the present invention
  • FIG. 2 is a schematic circuit diagram of a power conversion unit in the LED driving device of the present invention.
  • FIG. 3 is a schematic circuit diagram of a microprocessor controller in an LED driving device of the present invention.
  • FIG. 4 is a schematic diagram of an LED circuit in an LED driving device of the present invention. In the picture:
  • FIG. 1 is a block diagram of a circuit of an LED driving device of the present invention
  • FIG. 2 is a circuit diagram of a power converting unit of the LED driving device of the present invention.
  • the LED driving device comprises a power conversion unit, a microprocessor controller 5 and an LED circuit 6, wherein the power terminal of the microprocessor controller 5 is connected to the power conversion unit, the output terminal and the LED.
  • the circuit 6 is connected.
  • the power conversion unit includes a pulse transformer 3 and a switching control circuit 2. The primary winding on the input side of the pulse transformer 3 is connected to the rectifier filter circuit 1 through the switch control circuit 2, and the secondary winding and the auxiliary winding on the output side pass.
  • the constant voltage control circuit 4 is connected to the LED circuit 6.
  • the power conversion unit inputs 220V AC mains, converts the output 4 ⁇ 20V DC voltage through the transformer, and converts the voltage and current required for the operation of the LED circuit 6 and the micro control processor 5.
  • the high frequency switch control circuit 2 can be connected to the micro control processor 5 to realize the whole lamp power-off and power-on control (within one 5 seconds of one-off time), changing the brightness of the LED light, and the micro control processor 5 can be set to a dimming Or N (segment number of the entire lamp illumination) dimming.
  • the main control frequency chip in the switch control circuit 2 can use PI company's TNY series chip, such as TNY278PN, TNY279PN.
  • the chip includes the source terminal S, the enable terminal EN, the bypass terminal BP and the drain terminal D, such as As shown in FIG. 2, the drain terminal D of the main control frequency chip is connected to a surge absorbing circuit, and the surge absorbing circuit is composed of a capacitor C3, a resistor R4 and a diode D4, and both ends of the surge absorbing circuit and the pulse The two ends of the primary winding of the transformer are connected.
  • FIG. 3 is a schematic diagram of a micro-processor controller circuit in the LED driving device of the present invention.
  • the main chip model selected by the micro control processor 5 is LB308NJ
  • the enable enable terminal K (2 feet) of the main chip is connected with a pulse level judging circuit
  • the pulse level judging circuit is composed of a diode D1, a resistor. R1 and R2 are composed, and the diode D1 and the resistor R2 are connected in parallel and then connected in series with the resistor R1.
  • the power supply terminal Vcc of the main chip is connected to the positive terminal Vo+ of the regulated output circuit through U2, and the U2 is a 5V three-terminal regulator, which converts the voltage generated by the driving power source into the 5V voltage required for the normal operation of the control IC, and is in the IC.
  • the voltage input terminal VCC is externally connected with a lOOOuF electrolytic capacitor C3 to supply a continuous supply of power to the chip.
  • AC1 and AC2 are the AC access terminals of the power controller (220V AC switch signal). When the switch is broken, AC1 and AC2 have no AC input. In the normal case, there is no current in the whole circuit.
  • the circuit composed of R1, R2 and D1 in Figure 3 will generate a low level recording into the chip, and the electrolytic capacitor C3 can be given to the chip. Continue to power for a few seconds.
  • the K pin of the main chip receives the level change signal captured by the level determining circuit, thereby making a record and outputting
  • the three pins CL1/CL2/CL3 are controlled on or off.
  • Three sets of constant current circuits built by double triodes control the three LED outputs, as shown in Figure 4. Therefore, in the case that the number of times of the conventional mechanical switch is different, one-way or multi-channel LED illumination may occur; and finally, the LED bulb can be formed by a conventional mechanical switch to achieve different brightness illumination effects.
  • the LED driving device and the control method thereof provided by the present invention can control the brightness of a novel LED lamp by using an inherent mechanical lamp switch, and determine the brightness control by turning off and turning on the switch.
  • There are different needs for lighting at different times in a fixed place such as the need for brighter light for work, relatively moderate light for entertainment, and weaker lighting for rest.
  • the same LED energy-saving lamp can display different luminous fluxes at different needs, and the power will be different at the same time (high light corresponds to relatively high power consumption, weak light corresponds to relatively low power consumption), thereby avoiding electric energy. Excess consumption is conducive to energy saving and environmental protection.

Landscapes

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

Abstract

一种LED驱动装置及其控制方法。LED驱动装置包括电源转换单元，微处理控制器（5）和LED电路（6）。电源转换单元包括脉冲变压器（3）和开关控制电路（2）。脉冲变压器（3）输入侧的初级绕组通过开关控制电路（2）和整流滤波电路（1）相连，输出侧的次级绕组和辅助绕组通过恒压控制电路（4）分别与微处理控制器（5）和LED电路（6）的电源端相连。微处理控制器（5）的输出端和LED电路（6）相连。所述LED驱动装置及其控制方法，利用开关控制电路（2）采集机械式灯具开关的开关信号，通过微处理控制器（5）驱动LED电路（6）进行调光，从而减少功耗。

Description

一种 LED驱动装置及其控制方法
技术领域
本发明涉及一种驱动电路及其控制方法，尤其涉及一种 LED驱动装置及其控制方 法。 背景技术
LED (Light Emitting Diode), 发光二极管， 是一种固态的半导体器件， 它可以 直接把电转化为光。 LED的心脏是一个半导体的晶片， 晶片的一端附在一个支架上， 一端是负极， 另一端连接电源的正极， 使整个晶片被环氧树脂封装起来。 半导体晶 片由两部分组成， 一部分是 P型半导体， 在它里面空穴占主导地位， 另一端是 N型 半导体， 在这边主要是电子。 但这两种半导体连接起来的时候， 它们之间就形成一 个 P-N结。 当电流通过导线作用于这个晶片的时候， 电子就会被推向 P区， 在 P区 里电子跟空穴复合， 然后就会以光子的形式发出能量， 这就是 LED发光的原理。 而 光的波长也就是光的颜色， 是由形成 P-N结的材料决定的。
目前市场上的 LED驱动装置，方部分存在着亮度不够，功率太高，散热效果差， 光衰减快， 成本高等问题。 因此， 有必要改进 LED驱动装置及其控制方法， 减少功 耗并提高亮度。 发明内容
本发明所要解决的技术问题是提供一种 LED驱动装置及其控制方法， 能够改善 散热效果， 减少功耗并提高亮度。
本发明为解决上述技术问题而采用的技术方案是提供一种 LED驱动装置，包括 电源转换单元、 微处理控制器和 LED 电路， 其中， 所述电源转换单元包括脉冲变压 器和开关控制电路， 所述脉冲变压器输入侧的初级绕组通过开关控制电路和整流滤 波电路相连， 输出侧的次级绕组和辅助绕组通过恒压控制电路和微处理控制器的电 源端相连， 所述微处理控制器的输出端和 LED电路相连。
上述的 LED驱动装置，其中，所述整流滤波电路包括前级电容 CX1、整流桥 BD1 和初级 形滤电路， 所述初级 形滤电路由电容 Cl、 电容 C2和电感 L1组成。 上述的 LED驱动装置， 其中， 所述开关控制电路包括主控开关频率芯片， 所述 主控开关频率芯片的漏极端 D和突波吸收电路相连， 所述突波吸收电路由电容 C3， 电阻 R4和二极管 D4组成， 所述突波吸收电路的两端和脉冲变压器的初级绕组的两 端相连。
上述的 LED驱动装置， 其中， 所述恒压控制电路包括稳压输出电路和辅助电压 控制电路； 所述稳压输出电路的正极端 Vo+通过电感 L3、 整流管 D6和脉冲变压器的 次级绕组的一端相连， 负极端 Vo-和脉冲变压器的次级绕组的另一端相连，所述整流 管 D6两端并联有由电阻 R6和电容 C8组成的滤波电路， 电感 L3的两端通过输出滤 波电容 C6, C7和次级绕组的另一端相连； 整流管 D6的输出端通过恒压稳压管 VR2 , 检测电阻 R7和光电耦合器 U2的输出端相连， 所述光电耦合器 U2的输入端和主控开 关频率芯片的输出端 FB相连； 所述辅助电压控制电路由二极管 D5， 电容 C4和电阻 R5组成， 所述二极管 D5， 电容 C4和脉冲变压器的辅助绕组的两端相连形成闭合回 路， 所述电容 C4的一端通过电阻 R5和主控开关频率芯片的旁路端 BP相连， 另一端 接地； 所述主控开关频率芯片的旁路端 BP通过电容 C5接地。
上述的 LED驱动装置， 其中， 所述微处理控制器的电源端 Vcc通过三端稳压器 和稳压输出电路的正极端 Vo+相连，允许使能端 K通过脉冲电平判断电路和稳压输出 电路相连， 所述脉冲电平判断电路由二极管 Dl， 电阻 R1和 R2组成， 所述二极管 D1 和电阻 R2并联后再与电阻 R1串联。
上述的 LED驱动装置， 其中， 所述微处理控制器的输出端通过多组由双三极管 组成的恒流控制电路和 LED电路相连， 每组恒流控制电路驱动一路 LED电路。
上述的 LED驱动装置， 其中， 所述 LED电路包括 CL1、 CL2、 CL3三路 LED灯串， 每路 LED灯串由多个 LED串并联而成。
本发明为解决上述技术问题还提供一种上述 LED驱动装置的控制方法， 包括如 下步骤： a) 电源转换单元采集机械式开关控制灯具的开关信号； b) 微处理控制器 接受来自电源转换单元的开关信号， 并输出控制信号对 LED电路进行通或断的控制。
上述的 LED 驱动装置的控制方法， 其中， 所述开关信号一次通断时间间隔为 0. 1〜6秒， 所述微处理控制器通过脉冲电平判断电路接受来自电源转换单元的开关 信号， 所述脉冲电平判断电路由二极管 Dl， 电阻 R1和 R2组成， 所述二极管 D1和电 阻 R2并联后再与电阻 R1串联。 本发明对比现有技术有如下的有益效果： 本发明提供的 LED驱动装置及其控制 方法， 利用开关控制电路采集机械式灯具的开关信号， 通过微处理控制器驱动 LED 电路进行调光， 从而改善散热效果， 减少功耗并提高亮度。 附图说明
图 1为本发明 LED驱动装置电路方框示意图；
图 2为本发明 LED驱动装置中电源转换单元电路示意图;
图 3为本发明 LED驱动装置中微处理控制器电路示意图;
图 4为本发明 LED驱动装置中 LED电路示意图。 图中：
1 整流滤波电路 2 开关控制电路 3 脉冲变压器
恒压控制电路 5微处理控制器 6 LED电路
41 稳压输出电路 42 辅助电压控制电路 具体实施方式
下面结合附图和实施例对本发明作进一步的描述。
图 1为本发明 LED驱动装置电路方框示意图； 图 2为本发明 LED驱动装置中电 源转换单元电路示意图。
请参见图 1和图 2，本发明提供的 LED驱动装置包括电源转换单元、微处理控制 器 5和 LED电路 6， 其中， 微处理控制器 5的电源端和电源转换单元相连， 输出端和 LED电路 6相连， 所述电源转换单元包括脉冲变压器 3和幵关控制电路 2， 脉冲变压 器 3输入侧的初级绕组通过开关控制电路 2和整流滤波电路 1相连， 输出侧的次级 绕组和辅助绕组通过恒压控制电路 4和 LED电路 6相连。 电源转换单元输入 220V交 流市电， 通过变压器转化输出 4〜20V直流电压， 转为 LED电路 6和微控制处理器 5 工作所需要的电压及电流。 高频开关控制电路 2可以和微控制处理器 5相连实现整 灯断电一通电控制 （一次通断时间在 5秒以内）， 改变 LED发光亮度， 微控制处理器 5可以设定为一段调光或 N (整灯发光亮度的分段数字） 段调光。
开关控制电路 2中的主控幵关频率芯片可以选用 PI公司的 TNY系列芯片， 比如 TNY278PN、 TNY279PN„ 该芯片包括源极端 S、 使能端 EN、 旁路端 BP和漏极端 D， 如 图 2所示； 主控幵关频率芯片的漏极端 D和突波吸收电路相连， 所述突波吸收电路 由电容 C3， 电阻 R4和二极管 D4组成， 所述突波吸收电路的两端和脉冲变压器的初 级绕组的两端相连。
图 3为本发明 LED驱动装置中微处理控制器电路示意图。
请继续参见图 3， 微控制处理器 5选用的主芯片型号为 LB308NJ, 主芯片的允许 使能端 K (2脚）外接脉冲电平判断电路， 所述脉冲电平判断电路由二极管 Dl， 电阻 R1和 R2组成， 所述二极管 D1和电阻 R2并联后再与电阻 R1串联。 主芯片的电源端 Vcc通过 U2和稳压输出电路的正极端 Vo+相连， U2为 5V的三端稳压器，将驱动电源 产生的电压转变为控制 IC正常工作所需要的 5V电压， 并在 IC的电压输入端 VCC外 接了一个 lOOOuF的电解电容 C3来给芯片做一个持续行的供电， AC1、 AC2是电源控 制器的交流接入端 （220V AC开关信号）。 当开关断掉后， AC1、 AC2没有交流输入， 常规情况是整个电路没有电流了； 图 3中的 Rl、 R2、 D1组成的电路会产生一个低电 平记录进芯片， 电解电容 C3可以给芯片持续供电几秒钟。 当驱动电源因为传统式机 械开关的一次动作由开一关一开， 主芯片的 K脚会接收到来自电平判断电路所捕捉 到的电平变化信号， 从而做出一次记录， 并会对输出的三个引脚 CL1/CL2/CL3进行 通或是断的控制。 三组由双三极管搭建起来的恒流电路分别控制着三路 LED输出， 如图 4所示。 从而形成， 在传统式机械开关动作的次数不一样的情况下， 会出现一 路或者是多路 LED发光的效果； 最终形成了 LED球泡灯可以通过传统机械式开关来 完成不同亮度的照明效果。
综上所述， 本发明提供的 LED驱动装置及其控制方法， 可以通过使用固有的机 械式灯具开关对新型的 LED灯亮度处理， 通过开关的关断与开通来决定一次亮度的 控制。 对于人们在固定场所的不同时段对照明有着不同的需求， 比如工作需要较明 亮的光线、 娱乐时需要相对适中的光线、 休息前需要的是比较弱的照明。 同样的一 颗 LED节能灯，可以在不同需求的时候表现出不同的光通量， 同时功率也会不同（强 光对应相对较高功率消耗、 弱光对应相对较低功率消耗）， 从而避免了电能的多余消 耗， 利于节能环保。
虽然本发明己以较佳实施例揭示如上， 然其并非用以限定本发明， 任何本领域 技术人员， 在不脱离本发明的精神和范围内， 当可作些许的修改和完善， 因此本发 明的保护范围当以权利要求书所界定的为准。

Claims

权 利 要 求 书
1、 一种 LED驱动装置， 包括电源转换单元、 微处理控制器和 LED电路， 其特 征在于， 所述电源转换单元包括脉冲变压器和开关控制电路， 所述脉冲变压器输入 侧的初级绕组通过开关控制电路和整流滤波电路相连， 输出侧的次级绕组和辅助绕 组通过恒压控制电路和微处理控制器的电源端相连， 所述微处理控制器的输出端和 LED电路相连。
2、 如权利要求 1所述的 LED驱动装置， 其特征在于， 所述整流滤波电路包括 前级电容 CX1、 整流桥 BD1和初级 π形滤电路， 所述初级 JI形滤电路由电容 Cl、 电 容 C2和电感 L1组成。
3、 如权利要求 1所述的 LED驱动装置， 其特征在于， 所述开关控制电路包括 主控开关频率芯片， 所述主控开关频率芯片的漏极端 D和突波吸收电路相连， 所述 突波吸收电路由电容 C3， 电阻 R4和二极管 D4组成， 所述突波吸收电路的两端和脉 冲变压器的初级绕组的两端相连。
4、 如权利要求 1所述的 LED驱动装置， 其特征在于， 所述恒压控制电路包括 稳压输出电路和辅助电压控制电路； 所述稳压输出电路的正极端 Vo+通过电感 L3、 整流管 D6和脉冲变压器的次级绕组的一端相连， 负极端 Vo-和脉冲变压器的次级绕 组的另一端相连， 所述整流管 D6两端并联有由电阻 R6和电容 C8组成的滤波电路， 电感 L3的两端通过输出滤波电容 C6, C7和次级绕组的另一端相连； 整流管 D6的输 出端通过恒压稳压管 VR2，检测电阻 R7和光电耦合器 U2的输出端相连，所述光电耦 合器 U2的输入端和主控开关频率芯片的输出端 FB相连； 所述辅助电压控制电路由 二极管 D5， 电容 C4和电阻 R5组成， 所述二极管 D5， 电容 C4和脉冲变压器的辅助 绕组的两端相连形成闭合回路， 所述电容 C4的一端通过电阻 R5和主控开关频率芯 片的旁路端 BP相连， 另一端接地； 所述主控开关频率芯片的旁路端 BP通过电容 C5 接地。
5、 如权利要求 4所述的 LED驱动装置， 其特征在于， 所述微处理控制器的电 源端 Vcc通过三端稳压器和稳压输出电路的正极端 Vo+相连，允许使能端 K通过脉冲 电平判断电路和稳压输出电路相连， 所述脉冲电平判断电路由二极管 Dl， 电阻 R1 和 R2组成， 所述二极管 D1和电阻 R2并联后再与电阻 R1串联。
6、 如权利要求 1所述的 LED驱动装置， 其特征在于， 所述微处理控制器的输 出端通过多组由双三极管组成的恒流控制电路和 LED电路相连， 每组恒流控制电路 驱动一路 LED电路。
7、 如权利要求 6所述的 LED驱动装置， 其特征在于， 所述 LED电路包括 CL1、 CL2、 CL3三路 LED灯串， 每路 LED灯串由多个 LED串并联而成。
8、 一种如权利要求 1所述的 LED驱动装置的控制方法， 其特征在于， 包括如 下步骤：
a) 电源转换单元采集机械式开关控制灯具的开关信号；
b) 微处理控制器接受来自电源转换单元的开关信号， 并输出控制信号对 LED 电路进行通或断的控制。
9、 如权利要求 8所述的 LED驱动装置的控制方法， 其特征在于， 所述开关信 号一次通断时间间隔为 0. 1〜6秒，所述微处理控制器通过脉冲电平判断电路接受来 自电源转换单元的开关信号， 所述脉冲电平判断电路由二极管 Dl， 电阻 R1和 R2组 成， 所述二极管 D1和电阻 R2并联后再与电阻 R1串联。
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