Evaluation of zero voltage and zero current switching performance of LLC resonant converter

DC-DC resonant converters have desired featuressuch as high efficiency and power density that make themsuitable for grid-connected photovoltaic systems. A LLCresonant converter can provide zero voltage and zero currentswitching in wide input and load range. In this paper, a fullbridge LLC resonant converter is designed in ۳۳۵ W input powerfor wide range of input voltage. MATLAB simulation of thedesigned converter was done to proof its abilities in both regionof DC characteristic. In best condition, ZVS region is moreefficient which value is about ۰.۹۴۳. However, in bad condition,ZCS region has higher efficiency.

Keywords:

LLC resonant converter , zero voltage switching , zero current switching , DC characteristic