Implementation of optimal trajectory control of series resonant converter

Optimal trajectory control was proposed based on the insight gained from a state-plane analysis, which is summarized. By utilizing the required transistor trajectory as the control law, this control method attempts to reach its steady-state operation in a time-optimal manner. The control automatically selects the optimum sequence of device conduction under all dynamic conditions. An implementation scheme for this control method was presented. The scheme reduces the complexity of the control method by making efficient use of the control circuit elements. The scaling procedure used to determine and set the scaling factors in the control scheme was also described. The transient response of the converter with optimal trajectory control was excellent as predicted. Comparison with the frequency-control method confirms the superior dynamic performance of the optimal trajectory control.<>