A DC/DC Modular Current-Source Differential-Mode Inverter

A single-stage differential-mode current-fed zero-current-switching inverter has been designed. This inverter has two modules of dc/dc converters that are connected differentially to the input source. This inverter does not require 60-Hz transformer, front-end dc/dc converter, and can boost a low-voltage input to ac output using a compact low-turns-ratio transformer because of the added voltage gain of the topology. Main switches of the inverter are soft switched. The inverter requires a smaller high-frequency transformer because of high-frequency switching, bipolar transformer current, and voltage in every switching cycle, and because the transformer sees only half of the input current. The modularity of the inverter extends the scope of the topology to be used as a dc/dc converter, single-phase inverter, and also the possibility of extending the topology to both split phase and three phase. A harmonic-compensation control is designed and implemented to reduce the total harmonic distortion of the output waveform using a proportional-resonant controller. The design and the analysis of the inverter have been validated using simulation results in the Saber simulator.