THREE–PHASE REDUCED SWITCH TOPOLOGIES FOR AC–DC FRONT–END AND SINGLE–STAGE CONVERTERS by Dunisha Wijeratne

THREE–PHASE REDUCED SWITCH TOPOLOGIES
FOR AC–DC FRONT–END
AND SINGLE–STAGE CONVERTERS
(THESIS FORMAT: Monograph)
by
Dunisha Wijeratne
Graduate Program in Engineering Science
Department of Electrical and Computer Engineering
A Thesis Submitted in Partial Fulfillment
of the Requirements for the Degree of
Doctor of Philosophy
The School of Graduate and Postdoctoral Studies
The University of Western Ontario
London, Ontario, Canada
©Dunisha
Abstract
Conventional three-phase AC-DC converters have two converter stages. They have a
front-end converter that converts the input AC voltage into an intermediate DC bus voltage
and a second, back-end converter that converts this DC bus voltage into the desired isolated
DC output voltage. The front-end converter also performs power factor correction (PFC) and
shapes the three-phase input currents so that they are nearly sinusoidal and in phase with the
three-phase input voltages. This allows the AC power source to be used in the most efficient
manner.
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