In this paper an attempt is made to compare and evaluate three well-known and accepted SMR topologies with Active Power Factor Correction (APFC) , based on the criteria of switching stresses, efficiency, complexity of the control circuitand number of semiconductor devices used. To make this task easier, typical values of power semiconductor parameters for a medium power converter are used. As a result, the best suited topology for active input current waveshaping can be chosen for small to medium power applications. Finally, simulated key waveforms are obtained for all three topologies, which are used in the evaluation process.
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