In this paper the common-mode noise generation mechanism and its suppression is presented for the hardswitched isolated full-bridge forward topology. Due to the extensive interleaving of primary and secondary windings, such transformers exhibit large inter-winding capacitance which is the well-known cause of large common-mode noise current in the converter. Therefore, the effect of this large coupling capacitance is analyzed in this work for the hard-switched forward topology. Common-mode noise voltage source in the converter is determined analytically by analyzing its working principle. After identifying the major parasitic capacitive couplings within the converter, the common-mode noise model is established and analyzed. Based on the established model and the EMI requirements, a practical common-mode noise filter is implemented to comply with CISPR 11-Group 1-Class A requirements. Finally, the validity of the noise model and the filter design is verified by the experimental results.Keywords-Electromagnetic Interference; common mode noise; dc-dc converter, hard-switched boost and forward topology, modeling, transformer inter-winding capacitance I.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.