A high step-up current fed multi-resonant converter with output voltage doubler

A high step-up current fed multi-resonant converter (CFMRC) has been proposed recently for renewable energy harvesting where the sustainable power sources such as PV panels and fuel cells are characterized by low-voltage, high-current output. An output voltage doubler is applied to the previously proposed CFMRC for the purpose of reducing the turns-ratio of the transformer. Compared to the CFMRC with full bridge rectifier, the CFMRC with output voltage doubler simplifies the transformer structure and hence reduces the cost. By applying the interleaving technique, the ac resistances of the transformer windings are greatly reduced. When running a 150 W prototype at 255 kHz with 23 V input and 350 V output, a peak efficiency of 95.95% is achieved.