Patent ID: 8148908

Claim:
A power supply control device for lamp, wherein the control device is disposed between an AC power and an outlet, the control device comprises: an EMI (electromagnetic interference) filter circuit for filtering a signal from the AC power to obtain a filtered signal to avoid high frequency interference; a RC voltage step-down circuit for reducing an voltage of the filtered signal from the EMI filter circuit to obtain an reduced-voltage signal; a rectifying regulator circuit for rectifying and regulating the reduced-voltage signal from the RC voltage step-down circuit to obtain an rectified and regulated signal; a filter circuit for filtering the rectified and regulated signal from the rectifying regulator circuit to provide a stable power signal to a control unit; the control unit for storing all configurations and to read and process the received power signal; a LED switch connecting the control unit for the control unit to determine if a connected load is an LED lamp; a zero-crossover sampling circuit for obtaining a forward voltage signal and a reverse voltage signal and sending the obtained signals to the control unit for processing; at least one driver circuit connecting with the control unit; at least one tri-electrode AC switch (TRIAC) connecting with the AC power, the driver circuit and an outlet; when the control unit receives the obtained signals from the zero-crossover sampling circuit, the control unit uses the driver circuit to turn on the TRIAC after a specific time according to the connected load, thereby outputting the AC power to the outlet via the TRIAC.