LCC Resonant Converter Design and Transfer Function Computation Using FHA Analysis

Over the past few years, resonant converters have been used extensively in (Digital Switched Mode Power Supply) DSMPS applications such as telecom, server, lighting and onboard chargers. Resonant converters can achieve high efficiency, low level of EMI emissions and allow high frequency operation thanks to the soft switching over the entire operating range. The LLC and LCC resonant DC-DC converter topologies are being used widely in the industry. However, given its complexity, obtaining a reliable model that describes the converters operation is a tedious task. This paper will focus on the analysis of the Half-Bridge (HB) LCC resonant DC-DC converter and its voltage gain computation, derived on the basis of Fundamental Harmonic Approximation (FHA) approach. This method can be applied to any resonant topology and here, in particular, has been applied to the LCC converter.