Passivity-based adaptive controllers for quasi-resonant buck convertor

Passivity-based adaptive controllers are presented for the stabilisation of the buck quasiresonant convertor. Both direct and indirect voltage regulat ion schemes are addressed. The circuit components of the convertor are assu med constant but unknown. The adaptive controllers are designed based on th e average model of the convertor arid follow the 'energy shaping Plus dampi ng injection' ideas of the passivity-based approach. Simulation results are presented to illustrate the features of these proposed adaptive controller s.