A design methodology for LLC resonant converters based on inspection of resonant tank currents.

This paper presents a simple and accurate design methodology for LLC resonant converters, based on a semi-empirical approach to model steady-state operation in the “below-resonance” region. This model is framed in a design strategy that aims to design a converter capable of operating with soft-switching in the specified input voltage range with a load ranging from zero up to the maximum specified level.