Exact sampled-data analysis of quasi-resonant converters with finite filter inductance and capacitance

摘要

Previous models of quasi-resonant converters generally use averaging use averaging and assume infinite filter induc- tance and capacitance to reduce circuit complexity, but at the expense of accuracy. In this paper, exact sampled-data modelling is used. A general block diagram model applicable to various topologies of quasi-resonant converters is proposed. Large-signal analysis, steady-state analysis and small-signal anal- ysis are all studied. They agree closely with the experimental results in the literature. Compared with the averaging approach, the sampled-data approach is more systematic and accurate.