CN102300375A - 一种适用可控硅调光器的led调光线路 - Google Patents
一种适用可控硅调光器的led调光线路 Download PDFInfo
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Abstract
一种适用可控硅调光器的LED调光线路，50/60Hz交流正弦波波形经过三端双向可控硅开关(TRIAC)斩波，经过桥式整流电路(A)整流，由隔离电路(U1)取出斩波波形送入单片机控制单元(MCU)，单片机控制单元(MCU)输出PWM波形给LED驱动芯片(LEDDRIVE)，LED驱动芯片(LEDDRIVE)驱动发光二极管(LED1、LED2)发光。它使LED灯直接替换白炽灯调光效果一样完美，并且电路简单，成本较低克服了LED灯替换白炽灯的一个重要阻碍。
Description
技术领域：
本发明涉及一种适用可控硅调光器的LED调光线路，属光电子技术应用领域，应用于通用照明。
背景技术：
调光不但节约电能，更是高质量照明必须，满足不同场景照明需求。作为白炽灯的调光方案，可控硅调光器具有经济方便、应用广泛的特点，调光效果非常完美。
目前，由于能效和环保的原因，世界各国都立法逐步淘汰禁用白炽灯，照明的主角是节能灯和LED灯，并且，由于LED灯无汞、无红外辐射和紫外线辐射，更高效节能更长寿也更环保，LED灯显然是未来照明的主流。但是，LED灯的调光却存在下述缺点：
1、用户希望能沿用原有的可控硅调光器，直接将白炽灯换成LED灯。由于白炽灯是纯电阻，LED灯却不是纯电阻，直接更换后调光时，易造成LED灯的闪烁和发光抖动。
2、已有许多LED驱动芯片厂家推出可以配用可控硅调光器的芯片，但使用效果并不完美，配部分可控硅调光器可以正常调光，配另一部可控硅分调光器则闪烁，无法兼容所有类型的前切相、后切相调光器。
3、这些可调光芯片电路复杂，生产调试困难，以及高昂的成本，成为LED灯替换白炽灯的一个障碍。
发明内容：
本发明的目的就是针对现有技术之不足，而提供一种适用可控硅调光器的LED调光线路，它使LED灯直接替换白炽灯调光效果一样完美，并且电路简单，成本较低，克服了LED灯替换白炽灯的一个重要阻碍。
本发明的技术解决措施如下：
一种适用可控硅调光器的LED调光线路，50/60Hz交流正弦波波形经过三端双向可控硅开关斩波，经过桥式整流电路整流，由隔离电路取出斩波波形送入单片机控制单元，单片机控制单元输出PWM波形给LED驱动芯片，LED驱动芯片驱动发光二极管发光。
所述PWM波形的频率为桥式整流电路整流后输出波形频率的3～6倍。
本发明的有益效果在于：
它使LED灯直接替换白炽灯调光效果一样完美，并且电路简单，成本较低，克服了LED灯替换白炽灯的一个重要阻碍。它适合所有类型前切相、后切相调光器，不会因调光器差异造成闪烁等问题；采用成熟可靠的单片机，通过数字电路及程序控制，提高参数一致性同时降低生产和调试成本；有助于LED灯的普及。
附图说明：
图1是可控硅调光器的电路示意图。
图2是可控硅调光器的波形示意图。
图3是本发明电路原理图。
图4是本发明配合可控硅调光器的波形示意图。
具体实施方式：
实施例：见图1至4所示，一种适用可控硅调光器的LED调光线路，50/60Hz交流正弦波波形经过三端双向可控硅开关TRIAC斩波，经过桥式整流电路A整流，由隔离电路U1取出斩波波形送入单片机控制单元MCU，单片机控制单元MCU输出PWM波形给LED驱动芯片LEDDRIVE，LED驱动芯片LEDDRIVE驱动发光二极管(LED1、LED2)发光。
所述PWM波形的频率为桥式整流电路A整流后输出波形频率的3～6倍。
工作原理：结合图1可控硅调光器的电路示意图，在图2所示可控硅调光器的波形示意图中：P0为输入的50Hz交流正弦波波形，半周波10ms，一个周期20ms。P1A、P1B为经过可控硅斩波波形，调节可控硅调光器的旋钮，可改变截止时间t1和导通时间t2的比例，实现平滑调光。
P1A波形的截止时间t1短，导通时间t2长；P1B波形的截止时间t1延长，导通时间t2变短。
可见，P1B截止时间比P1A截止时间更长，则P1B的功率比P1A功率小，P1B的照度更低。通过调节可控硅调光器的旋钮，延长导通时间t2则功率增加，缩短导通时间t2则功率减小，相应地，亮度也同时增加或减小。
结合图3本发明电路原理图，在图4所示本发明配合可控硅调光器的波形示意图中：
P0为输入的50Hz交流正弦波波形，半周波10ms，一个周期20ms。；
P1为经过可控硅斩波的50Hz交流波形，调节可控硅调光器的旋钮，可改变截止时间t1和导通时间t2的比例。
P2是经过全桥整流电路后的100Hz脉动直流波形。
其中A部分截止时间t1短，导通时间t2长；B部分截止时间t1长，导通时间t2短。
LED驱动电路用100Hz脉动直流供电，易造成LED灯的闪烁和发光抖动；即使采用昂贵的特定可调光驱动电路，经过复杂的调试，使用效果还不理想，只适用部分可控硅调光器，无法兼容所有类型的调光器。
本发明通过隔离电路将前切相、后切相调光器的的高压斩波波形经波形整形、电平转换，变成对应的低压100Hz方波波形，如波形图P3所示，其高电平时间t2与低电平时间t1比例与导通时间t2与截止时间t1比例相同。这个低压100Hz方波波形P3送入单片机控制单元，单片机控制单元输出的PWM波形频率提高数倍(例如400Hz)以避免人眼可察觉的闪烁感。这个PWM波形的占空比取决于P2波形的导通时间t2与截止时间t1比例，该PWM波形输入LED驱动电路的PWM接口，即可实现理想的无闪烁平滑调光。同时，由于采用数字技术和程序运算控制，参数具有高度的一致性和稳定性，没有模拟电路因元器件的离散性而造成的调试困难。
P4分别显示大占空比的A部分PWM波形和小占空比的B部分PWM波形。
P5则是LED驱动器输出到LED的恒流PWM波形。
具体来说，当可控硅调光器的旋钮调小，截止时间t1延长，导通时间t2变小；波形特性为P2的B部分，该波形经隔离整形和电平变换电路，得到P3的B部分方波输入单片机，单片机计算出P3的B部分波形的导通时间t2与截止时间t1比例变小，再调整输出PWM波形的占空比同步变小，LED发光相应减弱。
当可控硅调光器的旋钮调大，截止时间t1变小，导通时间t2延长；波形特性为P2的A部分，该波形经隔离整形和电平变换电路，得到P3的A部分方波输入单片机，单片机计算出P3的A部分波形的导通时间t2与截止时间t1比例变大，再调整输出PWM波形的占空比同步变大，LED发光相应增强。
由于PWM频率400Hz，每个导通周期内均稳定恒流，既无色坐标漂移，也无闪烁感，呈现完美调光效果。同时，单片机只计算P3波形的导通时间t2与截止时间t1比例，前切相与后切相并不影响输出PWM波形的占空比，调光效果不会改变。这是个独特的优势，模拟电路完全无法比肩。
Claims (2)
1.一种适用可控硅调光器的LED调光线路，其特征在于：50/60Hz交流正弦波波形经过三端双向可控硅开关(TRIAC)斩波，经过桥式整流电路(A)整流，由隔离电路(U1)取出斩波波形送入单片机控制单元(MCU)，单片机控制单元(MCU)输出PWM波形给LED驱动芯片(LEDDRIVE)，LED驱动芯片(LEDDRIVE)驱动发光二极管(LED1、LED2)发光。
2.根据权利要求1所述的一种适用可控硅调光器的LED调光线路，其特征在于：PWM波形的频率为桥式整流电路(A)整流后输出波形频率的3～6倍。
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