Publication Date


Document Type


Committee Members

Marian K. Kazimierczuk (Advisor), Kuldip S. Rattan (Committee Member), Saiyu Ren (Committee Member)

Degree Name

Master of Science in Engineering (MSEgr)


Resonant DC-DC converters play an important role in applications that operate at high-frequencies (HF). Their advantages over those of pulse-width modulated (PWM) DC-DC converters have led to the invention of several topologies over the traditional forms of these converters. Series resonant converter is the subject of study in this thesis. By variation in the switching frequency of the transistor switches, the optimum operating points can be achieved. Hence, the steady-state frequency-domain analysis of the series resonant converter is performed. The operational and characteristic differences between the series resonant and parallel resonant and series-parallel resonant configurations are highlighted. In order to understand the converter response for fluctuations in their input or control parameters, modeling of these converters becomes essential. Many modeling techniques perform analysis only in frequency-domain. In this thesis, the extended describing function method is used, which implements both frequency-domain and time-domain analysis. Based on the first harmonic approximation, the steady-state variables are derived. Perturbing the steady-state model about their operating point, a large-signal model is developed. Linearization is performed on the large-signal model extracting the small-signal converter state variables. The small-signal converter state variables are expressed in the form of the transfer matrix. Finally, a design example is provided in order to evaluate the steady-state parameters. The converter is simulated using SABER Sketch circuit simulation software and the steady-state parameters are plotted to validate the steady-state parameters. It is observed that the theoretical steady-state values agrees with the simulated results obtained using SABER Sketch.

Page Count


Department or Program

Department of Electrical Engineering

Year Degree Awarded