Modeling and simulation of generalized state space averaging for series resonant converter

This paper proposes a design close loop for series resonant converter based on generalized state space averaging modeling for the resonant converter. In addition, this study covers both the steady state analysis and small signal modeling for the series resonant converter, working under zero voltage switching conditions. The proposed closed loop system, which uses PID controller and the Observable Canonical Form (OCF), was simulated using MATLAB-SIMULINK. It was found that the fifth order PID controller generated voltage ripples which made the system difficult to stabilize, while the first order produced a very good stability response with 0.3 ms setting time. Besides, it was noticed that by controlling duty cycle D, the transfer function of the output voltage could be realized.