Series resonant converter control: complete tuning of an IP regulator

The authors deal with the closed-loop behaviour of DC-DC series resonant power converters, in which frequency is controlled through an IP regulator. Using a small signal modelling method, linear control strategies have been designed and their closed-loop performances, in particular their robustness, have been determined and compared. This study showed that the IP controller presents good characteristics. The authors therefore propose to expose general rules to tune up a control structure with an IP regulator, yielding a stable closed-loop behaviour over the whole range of operation. In particular, the large signal operation of a power convertor controlled in such a way is studied. All these rules are validated on an experimental power converter.<>