A Unified Analysis of LLC Resonant DC/DC Converter with Capacitive Output Filter

A unified analysis of the LLC resonant DC/DC converter with a capacitive output filter is proposed. For this purpose, the “first harmonic approximation” method is applied. Expressions for determining the main quantities of the converter are obtained. Dependencies for receiving the main converter quantities are determined. The switching areas of the transistors at zero voltage and zero current commutation are obtained.