Modeling of an AC-to-DC converter with a single-stage power factor corrector

For years, many authors have done new proposals about the use of single-stage solutions to meet IEC 61000-3-2 regulations. These kinds of topologies can reduce the harmonic content without excessively penalizing the efficiency of the converter. Furthermore, although they are called single-stage topologies, actually, they are not exactly single-stage converters because a part of the energy is processed twice. As a consequence, the small-signal model is not evident at all because the energy flow in the converter is quite complex. This paper deals with the dynamic model of a half-bridge converter with an active input current shaper. Both a small-signal model and a large-signal model have been obtained, and the results were compared with those of a real prototype. The experimental results of the dynamic behavior are also presented.