Dimmer having a power supply monitoring circuit,申请号US20050127864-传众专利搜索

Dimmer having a power supply monitoring circuit

申请公布号：US2006255745(A1)

申请号：US20050127864

申请日期：2005.05.12

申请公布日期：2006.11.16

申请人：

DEJONGE STUART;KUMAR RUSSIKESH

发明人：DEJONGE STUART;KUMAR RUSSIKESH

分类号：H05B39/04

主分类号：H05B39/04

摘要：A two-wire dimmer for control of a lighting load from an alternating-current (AC) power source includes a semiconductor switch, a power supply, and a control circuit. The power supply includes an energy storage input capacitor that is able to charge only when the semiconductor switch is non-conductive. The control circuit continuously monitors the voltage on the input capacitor and automatically decreases the maximum allowable conduction time of the semiconductor switch when the voltage falls to a level that will not guarantee proper operation of the power supply. The dimmer of the present invention is able to provide the maximum possible conduction time of the semiconductor switch at high end (i.e., maximum light intensity) while simultaneously ensuring sufficient charging time for proper operation of the power supply, and hence, the dimmer.