Abstract
This thesis presents five power decoupling methods of single phase AC/DC converters using three switch poles to achieve unity power factor operations. The methods proposed compensate the pulsating power at twice the grid frequency by circulating the reactive power through the power decoupling capacitors between the third switch pole and DC bus. This approach can eliminate the need of large filter capacitor in DC side which is required to suppress the low frequency ripples. This thesis will explain the principles of operations of the proposed methods, and experimental results will also be presented for validation.