Time Domain Analysis of Fourth Order LCLC Resonant Converter

An analytical methodology for the rapid steady-state analysis of fourth-order resonant power converters, with capacitive output filter, is proposed. Analysis of the converter shows that there are four intervals in half period. In each interval, the state-space equations is obtained and due to the soft switching of the converter, an exact equation for Zero Voltage Switching (ZVS) time and maximum dead time of the inverter switches is presented. To demonstrate the feasibility of this solution, prototype is assembled and tested with good performance and similar behavior to the one predicted by the models. The simulation and experimental results obtained from a 10kV, 370W prototype confirm the validity of theorical analysis. Copyright (C) 2011 Praise Worthy Prize S.r.l. - All rights reserved.