Research Of High Efficiency PFC Converters

With the widely use of power electronic devices in the grid and more stringent standards of international organizations, power factor correction has become a hot research topic. High efficiency PFC converters is a key research area in modern power electronics for the capability of enhancing electric power quality, improving the electric energy utilization and making products to satisfy international and national standards.The conventional boost topology is the most popular topology for PFC applications. It uses a dedicated diode bridge to rectify the ac input voltage to dc, which is then followed by the boost section. As the power level increases, the diode bridge losses significantly degrade the efficiency, so using bridgeless PFC topology has an important meaning to improve the overall system efficiency.By eliminating the diode bridge in the conventional boost power factor corrected converters, the dual boost power factor corrected converters may feature higher efficiency. The Semi-bridgeless boost power factor corrected converters decrease the common noise through adding two return diodes. This paper researches on application of semi-bridgeless boost power factor corrected converter based on DSP digital control technique and gives the detailed design, modeling result and simulations. According to the design, the paper builds a platform of semi-bridgeless boost power factor corrected converter and makes an experiment in case of 500W resistive load in the laboratory. The experiment results indicate the designed circuit is feasible and superior. Actual testing of the system to achieve the desired indicators, there is certain practical engineering application, particularly application of high indicators switching power supply side.