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<p>As the Navy moves toward a modular DC Zonal Electrical Distribution System (DC ZEDS) to reduce both cost and weight over traditional radial shipboard distribution, there is a need to capitalize on technological advances currently available. The 21st century shipboard power distribution system calls for a DC bus architecture to eliminate the need for large transformers and thousands of pounds of cable through the use of high-speed semiconductor converters. In order to realize dramatic reductions in the size and cost of shipboard components through the use of high-speed switches, switch designs must be thoroughly investigated and tested. This thesis examines the use of soft- switching techniques fOr use in the future DC-to-DC power converter modules of the DC ZEDS. Soft-switching is analyzed here primarily with a DC down/converter (buck chopper). A low voltage buck chopper is simulated utilizing PSPICE and modeled in the lab. A voltage feedback control algorithm is developed and utilized with the PSPICE model. A comparative study of circuit efficiency is done between a single-source and a two-source soft-switched topology. Finally, recommendations are made for further simulation and modeling to evaluate soft- switching, high-voltage performance capabilities.
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Turner, Clifton C.</div>
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