US Patent No. 10,462,868

CIRCUIT AND METHOD FOR DRIVING LED LAMP WITH A DIMMER


Patent No. 10,462,868
Issue Date October 29, 2019
Title Circuit And Method For Driving Led Lamp With A Dimmer
Inventorship Jianhua Duan, Shanghai (CN)
Xuegang Ren, Shanghai (CN)
Na Liu, Shanghai (CN)
Assignee BCD Semiconductor Manufacturing Limited, George Town, Grand Cayman (KY)

Claim of US Patent No. 10,462,868

1. A driver circuit for an LED (light-emitting diode) lamp, comprising:a transformer having a primary winding and a secondary winding;
a dimmer circuit coupled to a power source and the primary winding for varying an input voltage to the primary winding;
a power switch coupled to the primary winding for controlling a current flow in the primary winding;
an output rectifying circuit coupled to the secondary winding and the LED lamp for providing an output current to the LED lamp;
a controller coupled to the dimmer circuit to receive an average input voltage signal from the dimmer circuit, the controller being coupled to a control terminal of the power switch and configured to vary the output current according to the average input voltage signal.