Conducted EMI reduction of a soft-single-switched boost converter using heat-sink capacitance cancellation

Conventional power supplies are considered as sources of electromagnetic interference. Increasing use of power converters leads to the need of electromagnetic emissions. Although soft switching methods are addressed to reduce electromagnetic emissions, the amount of EMI reduction may not be enough which leads to employ another EMI reduction methods. In this paper, a pulse width modulation soft-single-switched boost converter is modeled from conducted EMI viewpoint and its conducted EMI is predicted. To reduce EMI, a EMI reduction technique based on cancellation of the switch parasitic capacitor is investigated. This technique is applied to the converter and conducted EMI is simulated. The comparison between simulation results shows a considerable reduction in conducted EMI levels after applying this technique.