Steady state analysis and performance characteristics of the LLC-type parallel resonant converter

In this paper, the steady state analysis of a new half-bridge DC-to-DC parallel resonant converter with LLC-type commutation circuit is presented. Based on the state variable transformation approach, a two-dimensional state-plane diagram is constructed to obtain the steady state response. A set of characteristic curves for output conversion and component stresses is derived from the analysis which can be used for the converter design. It is shown that based on these curves, the proposed resonant topology possesses more desirable features than the conventional parallel resonant converter. Also simulation results are presented to verify the theoretical approach