Design Approach of Non-Isolated Converters with Passive Soft Switching

Abstract

High-frequency switching techniques enable the miniaturization of inductors in non-isolated DC/DC converters. However, higher frequency converters cause large switching power losses. This paper proposes a design method for a high-frequency, non-isolated buck DC/DC converter with a passive soft-switching circuit. The calculation results of the converter revealed decrease in power losses compared to that of a hard switching converter, for over 50kHz. A 2.1kW prototype was designed for reification, and it achieved a power efficiency of 95.6%.