A novel lower output ripple single-stage flyback LED driver

Due to low cost and high efficiency advantages, AC-DC single-stage LED driver has been widely used, But there is existing the problem of larger twice line frequency output ripple, and current ripple is one of the important factors to affect LED light-emitting properties and lifetime. A suitable kind of LED driver that single-stage flyback PFC circuit based on auxiliary winding and current ripple suppression strategies is proposed in this paper, the working principle of the proposed circuit and the implementation condition of low output current ripple are analyzed in detail. The simulation and experiment are carried out to verify the correctness and feasibility of the theoretical analysis, in switch the output current ripple can be reduced effectively through the proposed single-stage LED driver, and the input characteristics doesn´t be affected.