Study, simulation and building of SEPIC converter for LED lighting

In this work, a careful study of SEPIC converter for LED lighting has been studied. Six mode of operating has been analyzed: uncoupled inductors continuous conduction, uncoupled inductors discontinuous conduction, coupled inductors continuous conduction without leakage inductance, coupled inductors discontinuous conduction without leakage inductance, coupled inductors continuous conduction with leakage inductance, coupled inductors discontinuous conduction without leakage inductance. The result of this study is that the mode coupled inductors discontinuous conduction with leakage inductance is interesting. We have shown that the efficiency is significantly increased in comparison with its competitor Fly- Back. A simulation of these modes could confirm the theoretical approach developed. An experimental setup with a 24V input and 24V output voltage-2A confirmed our apprehension as between the removal of CALC (dissipative) at the opening. The experimental tests have allowed us to achieve a efficiency of 92% with a switching frequency of 200 kHz.