Yung-Lin Lin


Resonant power converters are switched RLC circuits where the switching action creates oscillatory current and voltage waveforms at the resonant frequency of the circuit . There are two basic types of resonant converters: the series type and the parallel type. In the series resonant converter the output i s connected in series with the resonating elements which are comprised of the resonant inductor and capacitor. In the parallel resonant converter, the voltage across the capacitor is sensed and coupled to the output port. The output parameter (voltage in the series resonant converters or current in the parallel resonant converters) and the switching frequency characterize the operation of resonant converters. An accurate analysis of series and parallel resonant converters i s given i n terms of these parameters. In this thesis, resonant converters with lumped losses are analyzed. State-plane portraits are generated from the solutions of circuit equations of these second order system, whereby the steady state, system dynamics, and the peak stresses are determined. Equation for the switching boundary i s given under the lossless assumption. Control strategies for the resonant converters are discussed and a novel method of control, optimal control, is proposed in controlling the parallel resonant converters. Typical circuits are simulated by using SPICE2 and Interactive Circuit Design Program (ICD). A parallel resonant converter was built. The simulation and the experimental results verify the analytical results.

Library of Congress Subject Headings

DC-to-DC converters; Electric current converters

Publication Date


Document Type


Student Type


Degree Name

Electrical Engineering (MS)

Department, Program, or Center

Electrical Engineering (KGCOE)


R Unnikrishnan


RIT – Main Campus

Plan Codes