Abstract
Wireless inductive chargers are benedictional over plug-in chargers when human safety and convenience are the main concern. The advancement in the inductive chargers is yet less appreciable due to the loss of soft switching, low efficiency with load variation, and compatibility. In this study, a modified inductive power transfer capable DC–DC converter topology for electric vehicle battery charging is proposed. A simple auxiliary network is proposed and is supplemented with a modified pulse width modulation gating technique for achieving soft-switching over full load variations. In addition to achieving zero-voltage switching during turn-on and turn-off process, the proposed auxiliary network aids in the converter size reduction as compared with fourth order compensation topologies. This proposed topology also provides flexibility in switch selection, reduced switch stress. The operating principle and working of the proposed topology are validated through MATLAB simulations. Finally, experimental results obtained using a laboratory prototype rated for 600 W at 85 kHz are presented. The simulation and experimental results are found to be in good agreement with full load efficiency of 91.5%.
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