Adaptive controllers for the series resonant converter: an experimental comparative study

It is the purpose of this paper to explore the problem of regulating the output voltage of a series resonant DC-to-DC converter (SRC). Using harmonic estimation, the discontinuous system can be modeled as a static nonlinearity in cascade with a first order system. Thus reducing the complexity of the problem. The authors propose two different output feedback control laws. The first control is adding to a passivity based controller an adaptive law to estimate the unknown resistive load. They show that this controller is downward compatible with a controller recently proposed after some simple considerations. In the second controller, the authors propose to cancel the static nonlinearity part of the system and include a proportional controller plus an adaptive scheme. Using an experimental setup, both converters are implemented and the results are presented as a comparative study.