Abstract
This thesis compares three kinds of power decoupling circuits of single phase AC/DC converters .The converters have Power factor correction and bidirectional power flow capability and compensate the pulsating power at twice the grid frequency by power decoupling circuits. In order to improve the overall efficiency of DC/AC converter, an overall power loss analysis was conducted. The proposed methods compensate the pulsating power at twice the grid frequency by circulating the reactive power through power decoupling capacitor; the capacitance which used in dc bus can be eliminated. The elaborate calculation of conduction loss, switching loss, reverse recovery loss, copper loss, and core loss are presented to give a quantitative analysis of power loss, through losses analysis to choose the suitable switches and use optimal inductance to improve efficiency. This thesis will explain the principles of operations of the proposed methods, and experimental results will also be presented for validation.