Comparative analisys of performance for single-phase AC-DC converters using FPGA for UPS applications

This paper presents a comparative analysis of performance for three single phase AC-DC converters for UPS applications. The analyzed converters are the conventional three-level converter, the five-level interleaved converter, and the T type five-level converter. Such converters are used as input stage of UPS and have as common characteristic: power factor correction, digital control using FPGA and connection between input power supply and converter output enabling the use of UPS inverter and bypass. All the converters have the same design parameters, and the project specifications. The control system used to perform the PFC is based on OCC technique implemented by FPGA. The analyzed topologies comparison parameters are: current semiconductors stresses, power factor, total harmonic distortion, magnetic volume and weight, efficiency and dynamics response.