Modeling and design of multi-loop controlled series resonant regulator

A modeling and design approach is proposed for a multiloop controlled series resonant regulator. The discrete time-domain modeling of a state feedback controlled series resonant converter (SRC) operating below the resonant frequency is derived in a state space form. Using this modeling, design guidelines for selecting the state feedback gains are presented. Then, the small-signal characteristics of the multiloop controlled series resonant regulator can be analyzed to design the error amplifier by considering the voltage feedback loop as a single loop of the state feedback controlled SRC. This approach has the advantage that the state feedback loop and the outer voltage feedback loop can be designed separately, thus simplifying the design of the feedback loops