Abstract: A high step-up current-fed resonant converter is required for interfacing the sustainable power sources, such as PV panels and fuel cells, which are characterized by low-voltage high-current output and have strict current ripple requirement. A DC DC resonant converter with intermediate AC link provides higher gain with soft switching abilities. LCC resonant converters provide high voltage gain with better transformer utilization. But due to the presence of resonance, there will be circulating energy which is carried by the split capacitors. This circulating energy will increase input current ripple, conduction losses. Considering the necessity of high voltage boosting function with low input current ripple and low circulating energy, the most appropriate converters are current fed full bridge or push-pull converter with output voltage doublers. Since the converter efficiency can be considerably improved by reducing the count of the primary switches and implementing a transformer of a simple structure, a double inductor push-pull converter was selected. The resonant tank absorbs self-winding capacitances of transformer and junction capacitances of rectifying diode into the resonant capacitor. Thus current spikes get suppressed within the resonant circuit. In order to further improve the efficiency, voltage double circuit is applied to the output rectifier, respectively. This proposed system will reduce the circulating energy, since double inductor push-pull converter will act as an isolated double boost converter. This system is proposed with an expectation of improved efficiency, low input current ripple and low circulating current. A simulation of the proposed system is modeled with input voltage of 30V and output voltage of 380V is realized in MATLAB/Simulink. The system guarantees high voltage gain and efficiency.

Keywords: Resonant Converter, Front End Converter, Voltage Doubler

| DOI: 10.17148/IJIREEICE.2019.7307