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A Straightforward Methodology to Modeling High Power Factor AC–DC Converters

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5 Author(s)
Alonso, J.M. ; Dept. of Electr. Eng., Univ. de Oviedo, Gijόn, Spain ; Gacio, D. ; Sichirollo, F. ; Seidel, A.R.
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In this paper, a straightforward methodology to modeling high power factor (HPF) ac-dc converters is presented. The proposed methodology is based on the averaging technique directly applied to the converter under modeling. An averaged large-signal equivalent circuit is thus generated, which is useful to perform extremely fast simulations. From the large-signal model, both a steady-state and a small-signal analysis can be carried out to completely model the converter, achieving any desired steady-state characteristic and small-signal transfer function. The presented methodology is very intuitive and allows designers to achieve a natural understanding of the converter behavior. The methodology is illustrated with a HPF buck-boost converter operating in discontinuous conduction mode. Simulation and experimental results are provided to validate the proposed methodology.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 10 )