Soft switched coupled inductor based high step up converter for distributed energy resources

In this paper coupled inductor based high step up converter for dc micro grid is proposed. Switched capacitor based improved voltage extension cell is utilized to obtain high voltage gain. By using extended and improved voltage doubler cell, the voltage stress on the main switch and output diode are reduced. So active switches of low R_ds(on) can be used and thus overall efficiency of the system is improved. Active clamp technique is incorporated to limit the voltage excursion on main switch and also to obtain zero voltage switching for both main and auxiliary switches which further improve the efficiency and power density. Design and analysis of the proposed converter is carried out and the result are verified by using PSIM Simulation package. Finally, a 500 W experimental prototype is build to verify the theoretical and simulation results.