Interleaved high step up converter for renewable energy sources

In this paper high step up two channel coupled inductor converter is proposed which can be used to interface low voltage renewable sources like solar photovoltaic, fuel cell system and energy storage elements like ultra-capacitors, battery etc. Interleaving technique reduces the output voltage ripple, current ripple and increases the power handling capacity. Leakage energy of the coupled inductors is effectively recycled to output using passive clamp technique which reduces the voltage stress on the active switches. So switches with low R_ds(on) can be utilize to reduce the conduction losses and thus improves the efficiency. Design and analysis of a 500W interleaved coupled inductor dc-dc converter with switched capacitor is presented. To verify performance of proposed scheme, simulation in PSIM9.1 is carried out and the results are provided. Finally, the experimental results from a 500Wprototype are provided to validate the theoretical analysis and simulation results.