An Interleaved Step-up DC-DC Converter with Lossless Snubber

In this paper, an interleaved step-up converter with two lossless snubbers is introduced, where the snubbers ensure zero-current switching for the main switches, eliminating the need for extra switches. Additionally, the energy from the snubbers is transferred to the output. All the switches in the converter are grounded, which negates the requirement for an isolated driver circuit. Another key characteristic of the converter is the balanced current across both phases. Moreover, the low voltage stress on the switches allows for the use of switches with lower drain-source resistance. The proposed converter has been thoroughly analyzed, and to validate the theoretical analysis, a prototype was simulated in PSPICE software and a 100W prototype was fabricated. The efficiency at full load is 96%, showing a 5% improvement compared to its hard-switching counterpart.