Abstract—This
paper proposes a new novel snubberless currentfed half-bridge front-end
isolated dc/dc converter-based inverter for photovoltaic applications. It is
suitable for grid-tied (utility interface) as well as off-grid (standalone)
application based on the mode of control. The proposed converter attains
clamping of the device voltage by secondary modulation, thus eliminating the
need of snubber or active-clamp. Zero-current switching or natural commutation
of primary devices and zero-voltage switching of secondary devices is achieved.
Soft-switching is inherent owing to the proposed secondary modulation and is
maintained during wide variation in voltage and power transfer capacity and
thus is suitable for photovoltaic (PV) applications. Primary device voltage is
clamped at reflected output voltage, and secondary device voltage is clamped at
output voltage. Steady-state operation and analysis, and design procedure are
presented. Simulation results using PSIM 9.0 are given to verify the proposed
analysis and design. An experimental converter prototype rated at 200 W has
been designed, built, and tested in the laboratory to verify and demonstrate
the converter performance over wide variations in input voltage and output
power for PV applications. The proposed converter is a true isolated boost
converter and has higher voltage conversion (boost) ratio compared to the
conventional active-clamped converter.
(Index
Terms—Current-fed converter, high frequency, photovoltaic (PV) inverter,
renewable energy system, soft-switching.)
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