A nine-switch interleaved three-phase AC-DC single stage isolated converter implemented with SiC MOSFETs

Abstract:

Three phase PFC rectifier followed by a DC-DC isolated converter has been the industry workhorse for conversion of three phase AC to isolated DC output used for high power (> 3kW) telecom loads. In this paper a reduced device count nine-switch converter topology which integrates the two stages of a conventional three phase AC-DC power supply with an isolated DC output voltage for telecom applications is proposed. A novel modulation scheme using three separate 120° phase shifted high frequency carriers for the three legs of the proposed converter is developed to drive the switches. It is shown that such modulation scheme leads to interleaved operation of the three DC-DC resonant converters integrated within the proposed topology resulting in low output DC voltage ripple. Proposed converter with the modulation scheme is validated using simulation results. A scaled-down laboratory set-up was also built and the experimental results are presented as a proof of concept.

Año de publicación:

2015

Keywords:

Fuente:

scopus