AB交流电驱动器22P-D310A103议价
AB交流电驱动器22P-D310A103议价
AB交流电驱动器22P-D310A103议价
AB交流电驱动器22P-D310A103接线图
AB交流电驱动器22P-D310A103引脚图
22P-D310A103调光原理
22P-D310A103市面上大多数可控硅调光器基本结构如图1所示,其工作原理如下:当交流电压加双向可控硅TRIAC两端时,由于Rt、Ct组成的RC充电电路有一个充电时间,电容上的电压是从0V开始充电的,并且TRIAC的驱动极串联有一个DIAC(双向触发二极管,一般是30V左右),因此TRIAC可靠截止。
22P-D310A103当Ct上的电压上升到30V时,DIAC触发导通,TRIAC可靠导通,此时TRIAC两端的电压瞬间变为零,Ct通过Rt迅速放电,当Ct电压跌落到30V以下时,DIAC截止,如果TRIAC通过的电流大于其维持电流则继续导通,如果低于其维持电流将会截止。电感L和电容C的作用是减小电流和电压的变化率,以抑制电磁干扰EMI问题。
22P-D310A103可控硅前沿调光器若直接用于控制普通的LED驱动器,LED灯会产生闪烁,更不能实现宽范围的调光控制。
22P-D310A103原因归结如下:
(1)可控硅的维持电流问题。目前市面上的可控硅调光器功率等级不同,维持电流一般是7~75mA(驱动电流则是7~100mA),导通后流过可控硅的电流·须要大于这个值才能继续导通,否则会自行关断。
(2)阻抗匹配问题。当可控硅导通后,可控硅和驱动电路的阻抗都发生变化,且驱动电路由于有差模滤波电容的存在,呈容性阻抗,与可控硅调光器存在阻抗匹配的问题,因此在设计电路时一般需要使用较小的差模滤波电容。
(3)冲击电流问题。由于可控硅前沿斩波使得输入电压可能一直处于峰值附近,输入滤波电容将承受大的冲击电流,同时还可能使得可控硅意外截止,导致可控硅不断重启,所以一般需要在驱动器输入端串接电阻来减小冲击。
(4)导通角较小时LED会出现闪烁。当可控硅导通角较小时,由于此时输入电压和电流均较小,导致维持电流不够或者芯片供电Vcc不够,电路停止工作,使LED产生闪烁。
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