A New Common-mode EMI Reduction Method for PFC-LLC Power Module

With the rapid development of switching frequency and power density of high-density power supply (HDPS), the conducted electromagnetic interference (EMI) of converters is becoming increasingly severe. Different from traditional conducted EMI analysis for single-stage PFC or LLC circuit, this paper proposed a new EMI analysis method for the interplay on the common-mode (CM) EMI of PFC-LLC circuit. Based on this analysis method, this paper proposed a new CM EMI reduction method for PFC-LLC power module.