A Novel Single-Stage PFC LED Driver with Secondary Sideresonant Circuit

The resonant cell includes a capacitor and a diode is applied to the traditional single-stage flyback PFC converter,which can improve efficiency by recycling the energy of the secondary side leakage inductance and alleviate the high voltage stress of the switch and diode. The working mode of the novel secondary side resonant singlestage Flyback PFC converter in DCM is analyzed and the steady state characteristic is studied and compared with the traditional single-stage flyback PFC converter,and the converter is applied to the LED driver circuit. Finally,the theoretical analysis is verified by experimental results.