Simplified loss analysis and comparison of full-bridge,full-range-ZVS DC-DC converters |
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Authors: | Shubhendu Bhardwaj Mangesh Borage Sunil Tiwari |
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Affiliation: | (1) Department of Electronics and Instrumentation, Indian School of Mines University, Dhanbad, 826004, India;(2) Power Supplies Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India |
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Abstract: | The loss of zero-voltage-switching (ZVS) of active switches has been a serious limitation of full-bridge (FBZVS) converters.
Many techniques have been proposed in the past to extend the range of ZVS operation over the wider and also the full range
of operation. However, in these techniques ZVS is achieved at the expense of additional conduction loss in active switches
and losses in the auxiliary components. In this paper, the analysis for the additional losses in various full-range FBZVS
DC-DC converters and their comparative evaluation is reported. Closed form expressions are derived for average value of device
currents and losses. The loss curves for various topologies are plotted and compared. The analytical results are found to
be consistent with the experimental efficiency tests performed on 500 W, 100 kHz prototype. It is concluded that a recently
proposed new topology has the least penalty of additional losses. |
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Keywords: | Auxiliary current full-bridge DC-DC converters loss analysis ZVS |
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