Comprehensive Mathematical Modelling and Design of DM EMI Filter for Totem-pole PFC Converter

In this paper, the mathematical modeling of the Totem pole Power Factor Correction (PFC) converter is presented and compared with the simulation model and the hardware experiment. In the simulation model and the hardware experiment the control system consists of output voltage loop controller used to regulate the output voltage 400V and inner current loop controller helps in keeping the power factor closer to unity. The work shows the mathematical modeling of the input current FFT analysis. The input current generated through the mathematical model and the simulation model are also compared as a function of Total Harmonic Distortion (THD). This paper also illustrates the design method for EMI filter to suppress the Differential mode (DM) noise and to improve the power quality at the front end of the converter. The 500-W prototype of Totem-Pole PFC has been implemented with 110V ac on the input side to get 400V dc at the output end with 100kHz of switching frequency. The demonstration of the converter was made at the rated power of 500W and achieved the power factor of 0.983. The implementation of the DM EMI filter at the front end provides the required attenuation to meet the FCC class A EMI standard.