Single-Stage Coupled-Inductor Sepic-Type HB-LED Driver with Soft Switching for Universal Line Input

Abstract EN

This paper proposes a single-stage Sepic-type high brightness LED driver for universal line input to perform power factor correcting and LED dimming.

In the driver, a coupled inductor is introduced to replace with two separate inductors to lower volume and cost.

A soft-switching cell is embedded into the driver to obtain zero-voltage switching (ZVS) feature so as to furthermore improve driver efficiency.

Mathematical derivation and detailed discussion is presented.

A prototype is designed, analyzed and implemented, which demonstrates the feasibility of the driver and verifies the theoretical analysis.