resonant power converters have gained increased attention in industry due to various advantages over conventional pulse width modulation (pwm) converters. resonant converters have improved transient response, reduced switching losses and stresses, reduced equipment size and weight and reduced electromagnetic interference (emi). in this thesis, series resonant converters (src) in variable and constant frequency topologies are analyzed using state-space approach for effective control. the design and implementation of a practical optimal trajectory control (otc) scheme is shown. experimental results are presented to demonstrate the performance of the proposed control scheme.