IEEE Applied Power Electronics Conference and Exposition (APEC 2012) edition:10 location:Orlando (FL), USA date:5-9 February 2012
For realizing bidirectional and isolated AC/DC converters, soft-switching techniques seem to be a favourable choice as
they enable a further loss and volume reduction of the system. In contrary to the traditional two-stage approach, using a power factor corrector stage (PFC) in series with a DC/DC isolation stage, we showed recently that the same functionality can be achieved under full soft-switching operation using a single-stage dual active bridge (DAB) AC/DC converter. This paper investigates the performance of this single-stage approach by comparing it with a state-of-the-art conventional two-stage strategy (both soft-switching converters), where an interleaved triangular current mode (TCM) PFC rectifier was chosen in combination with a DAB DC/DC converter. The advantages and drawbacks of each concept are discussed in detail, focussing on the impact of the utilized semiconductor technology and silicon area on the converter efficiency. Furthermore, a comprehensive comparison of power density is allowed by the analytical models that correlate semiconductor, capacitor, inductor and transformer losses with their respective volume, resulting in the Pareto-Front. Experimental
data is provided to validate the conclusions of the theoretical analysis.
Jordi Everts is also a visiting doctoral researcher at the Power Electronic
Systems Laboratory, ETH Zurich, Switzerland (scholarship of FWO-Vlaanderen).