Research on Soft Switching of Three-level Boost Converter for PFC

According to the design ideology of softswitched extended-period quasi-resonant two-level Boost converter circuit,a soft switching cell of extend-period quasi-resonant had been added to the three-level Boost converter for power factor correction(PFC) applications,then a fully and simple soft-switched extended-period quasi-resonant three-level Boost converter for PFC circuit can be obtained. The proposed approach can effectively reduce the switching losses and electromagnetic interference(EMI) and it is verified through analysis,simulation and experiment.