Optimized Design of Distributed Power Systems for High Efficiency, High Power Density and Low EMI Noise

Abstract

This paper first discussed the EMI issues and solutions for boost PFC converters. The parasitic cancellation technique is then introduced to improve EMI filter's high frequency performance. A two-stage PFC topology is introduced to improve the power density of PFC. LLC topology is recommended for front-end DC/DC converters due to it high efficiency. For onboard DC/DC converters, one-stage approach is first proposed. A self-driven full-bridge resonant circuit and a current tripler are introduced to improve the current density and switching frequencies. The paper also discussed the two-stage approach and intermediate bus architecture