可変デッドタイム制御によるソフトスイッチングインバータの低出力域での高効率化

概要

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The power conversion efficiency of soft-switching inverter can be improved by using loss-less snubber commutation; however, the main switches of the inverter fail in zero-voltage turn-on when the output current is small. As a solution to this problem, adjustable dead time control that involves adjusting the dead time in a loss-less snubber commutation according to the magnitude of output current has been proposed. Adjustable dead time control achieves zero-voltage turn-on of the main switches of the inverter in a loss-less snubber commutation in the range of low output current; however, the inverter output current waveform is distorted. In this paper, we propose a scheme for adjustable dead time control with dead time compensation for soft-switching inverters. Moreover, the effectiveness of the proposed control scheme is verified by performing experiments. The results of the experiments reveal that when the proposed control scheme is adopted, the power conversion efficiency in the range of low output power improves up to about 3% and the THD is improved within 3%.
2011-05-01