A simplified power loss calculation method for PFC boost topologies

In this paper, a novel, simple and accurate method is proposed to predict the RMS and average current for each component in the most common continuous conduction mode (CCM) AC-DC power factor correction (PFC) boost derived topologies. The model is based on using the effective duty cycle independent of the switching action. The proposed model enables simple and accurate estimation of powertrain component conduction losses. The paper includes the derivation of the RMS, or average current for the boost and interleaved boost PFC topologies. PSIM simulation and experimental results are used to verify the accuracy of model. Experimental and simulation results of a prototype interleaved boost converter converting universal AC input voltage to 400 V DC at up to 3.4 kW output are given to verify the proposed model. The experimental results demonstrate that the model can correctly predict the RMS and average currents in the interleaved boost topology.