Snubberless Soft-switching (zcs/zvs) Closed loop Current-fed Half-bridge Converter Based PV Inverter
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 7
Abstract
Snubber circuit dissipates some amount of the output power along with increase in circulating current through the components, increasing their conduction losses and also increases the components count, converter complexity hence the efficiency will reduce. This paper proposes snubberless soft switching (ZCS and ZVS) closed loop current fed half-bridge converter based inverter for photovoltaic applications. It is suitable for off-grid (standalone) as well as grid-tied (utility interface) application based on the mode of control. Proposed converter attains clamping of the device voltage by secondary modulation, thus eliminating the need of snubber. Zero-current switching (ZCS) or natural commutation of primary devices and zero-voltage switching (ZVS) of secondary devices is achieved. Soft switching is maintained during wide variation in voltage and power transfer capacity, Output voltage from PV is stabilized by the feedback loop and thus is suitable for PV applications. Primary switch voltage is clamped at reflected output voltage and secondary switch voltage is clamped at output voltage. Design and analysis of the operation are presented. Simulation results are obtained from MATLAB and compared the results with openloop. The proposed converter is a true isolated boost converter and has higher voltage conversion ratio compared to conventional active-clamped converter.
Authors and Affiliations
Hemalata M Hiremath, T. N. Raghavendra
Keywords
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