Experimental Comparison of High-Power Soft-Switching Boost Converters with Auxiliary Switches

Many soft-switching techniques have been introduced for non-isolated DC-DC converters in the literature. However, most of them show the results at the low power level. In this paper, an experimental comparison of soft-switching interleaved boost DC-DC converters with auxiliary switches for high-power applications is presented. Two zero voltage transition (ZVT) boost converter prototypes with and without the third diode in the active snubber circuit are built and evaluated. Analysis, operating principles, and parameter design for the ZVT boost converter without using the third diode in the snubber circuit are provided. The experimental verifications from laboratory tests of equivalent 10-kW/50-kHz interleaved boost converters based on discrete SiC MOSFETs and diodes are given. The results are obtained for the input voltage of 200 V and the output voltage range from 320 V to 530 V. The efficiency and power loss distribution of the converters are compared.