Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 50, Issue 6, Pages 4132-4141Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2014.2315493
Keywords
High-frequency dc/dc converter; high-step-up; photovoltaic (PV) inverter; residential application; soft switching
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This paper presents a soft-switching current-fed full-bridge front-end-converter-based bidirectional inverter for residential photovoltaic (PV) applications. The proposed converter is an intrinsic isolated boost converter with a high-step-up voltage conversion ratio. The device voltage is naturally clamped owing to proposed secondary modulation. Zero-current commutation of current-fed devices is novel and makes the converter snubberless and fully soft-switched with natural clamping of the devices' voltage. Zero-current switching of primary devices and zero-voltage switching of secondary devices are achieved. Soft switching is inherent and is maintained during wide variation of input voltage and load independent. Steady-state operation, analysis, and design have been explained. A 200-W laboratory prototype of the inverter is developed and tested to demonstrate the performance over wide variations in input voltage and output power for PV applications.
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