Loss comparison of different nine-switch and twelve-switch energy conversion systems

Nine-switch converter is a recently proposed reduced-switch equivalence of the twelve-switch back-to-back converter. The usual expectation is thus for the nine-switch converter to face some switching constraints and hence performance tradeoffs. However, this might not always be the case with an answer only available after performing a thorough analysis. For that, it is the intention now to compare the nine-switch and twelve-switch converters when they are used in ac-ac, ac-dc, dc-ac or dc-dc energy conversion systems. Their losses will be compared to identify when the nine-switch converter will have an advantage or face only a slight constraint, which can hence better justify its usage to save switches. Simulation results are presented, while experimental loss measurements are presently ongoing.