請問..光暗制的工作原理

其實市面上既光暗制綫路有好多種，大多數用 SCR，TRIAC，MOS-FET 等電子元件來控制既，工作原理就係改變波形來達到調暗既目的，並唔係你所謂既降壓，你可以參考下面既圖你就會明白，線圈係用來濾諧波既，唔可以隨便改變線圈數。
用 SCR 來控制既調光制其中一種線路

圖片參考：http://bondeit.com/Files/Remoteupfile/2007-11/4/200731904349252.jpg



Leading Edge Phase Control





圖片參考：http://www.clipsal.com.au/consumer/__data/page/354/5099_phase1.gif




240V mains input






圖片參考：http://www.clipsal.com.au/consumer/__data/page/354/5099_phase2.gif

Maximum Brightness / Speed Setting





Load switched ON part way through mains half cycle




圖片參考：http://www.clipsal.com.au/consumer/__data/page/354/5099_phase3.gif

Minimum Brightness / Speed Setting



Adjusting the dimmer control setting changes the point at which the dimmer output switches ON







Trailing Edge Phase Control


圖片參考：http://www.clipsal.com.au/consumer/__data/page/354/5099_phase4.gif



240V mains input






圖片參考：http://www.clipsal.com.au/consumer/__data/page/354/5099_phase5.gif

Maximum Brightness





Load switched OFF part way through mains half cycle




圖片參考：http://www.clipsal.com.au/consumer/__data/page/354/5099_phase6.gif

Minimum Brightness



Adjusting the dimmer control setting changes the point at which the dimmer output switches OFF



圖片參考：http://www.dzcpkf.com/dlt/UploadPic/2007-12/20071214104713985.gif