A precise large signal model for a flyback converter in critical conduction mode

Operation in critical conduction mode of flyback converters has many advantages over constant frequency PWM. In this paper, this operation is briefly examined and a precise large signal model for the converter is proposed and verified. The model shows an almost linear behavior in a large range of feedback voltage. Therefore a classical Laplace analysis can be performed. There is an excellent agreement among the results obtained from large signal SIMULINK simulation, Pspice simulation and experiment.

[1]  Tseng King Jet,et al.  A novel and efficient free oscillating discrete TV power supply , 1999, IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029).

[2]  D. Tagliavia,et al.  DC-DC flyback converters in the critical conduction mode: a re-examination , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).