Frequency Domain Analysis Of Series Resonant Converters

The steady-state analysis of series resonant converters is presented using a frequency domain model. Generalized expressions for the resonant current and the capacitor voltage are derived. The possibility of multiple continuous conduction mode (MCM) when the power switches are supplied with continuous gate/base drive pulses is pointed out. Some important performance characteristics relating to output voltage, output current, switching frequency, feedback diode conduction angle are given. Some guide lines in the selection of component values and their ratings are given with an illustrative example. The model has been validated by comparing the results with those already published in the literature using a time-domain model.