An analytical methodology for the rapid steady-state analysis of fourth-order resonant power converters, with capacitive output filter, is proposed. The technique extends previously published work on LCC converters to the more common, but more complex, LCLC counterpart.\ud
The output filter/rectifier and load circuit are represented by multiple ‘equivalent’ passive components that permit the subsequent calculation of the steady-state voltage conversion ratio and the estimation of the voltage and current stresses on the resonant-tank components. The resulting\ud
methodology facilitates the derivation of four design synthesis procedures for LCLC converters based on various user-definable constraints. Simulation results and measurements from a prototype fourth-order converter are used to demonstrate the accuracy of the proposed methodology, whose computational requirement is comparable to that for classical fundamental-mode approximation
A methodology is presented for the high-speed, steady state analysis of 4th-order LCLC resonant power converters. Both current-output and voltage-output variants are considered. Statevariable dynamic descriptions of the circuits are derived and subsequently employed to rapidly\ud
determine the steady-state cyclic behaviour and the voltage and current characteristics of the resonant-tankand output-filter, and to estimate the voltage and current stresses on resonant components. Simulated and experimental results for two prototype 4th-order converters (inductive\ud
and capacitive output variants) confirm that the accuracy of the model is comparable with SPICE simulations, while requiring less than 104 of the computational time
A high-speed methodology for analysing fourth-order LLCC resonant converters is presented. Formula-based predictions of output voltage and, importantly, estimates of voltage and current stresses on resonant components, are derived. Comparison of predictions with those from SPICE demonstrate a high degree of correlation whilst requiring only 1/10,000th of the computation time
Abstract-The analysis, design and control of 4th_order LCLC voltage-output series-parallel resonant converters (SPRCs) for the provision of multiple regulated outputs, is described. Specifically, state-variable concepts are developed to establish operating mode boundaries with which to describe the internal behaviour of dualoutput resonant converters, and the impact of output leakage inductance. The resulting models are compared with those obtained from SPICE simulations and measurements from a prototype power supply under closed loop control to verify the analysis, modeling and control predictions.
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