Operation and Design of Series-Resonant Current-Source Full-Bridge DC-DC Converter

This paper presents a detailed analysis of a series LC resonant isolated current source converter (SR-CSC) with the focus on a buck operation mode. Topologies of this type are generally proposed for PV, fuel cell, battery charging or DC microgrid applications. The switching processes on the example of the full-bridge topology are described and the corresponding mathematical equations derived. Further, the operational parameters of the converter, including switching frequency as well as transistor voltage and current stresses are estimated. The performed analysis is may be used to determine the component values for the optimal design of the DC-DC converter for a case study system. The obtained findings are verified with a simulation model of a 3.3 kVA SR-CSC.