A Comparative Investigation of Several Frequency Modulation Profiles for Programmed Switching Controllers Targeted Conducted-Noise Reduction in DC-DC Converters

Gamal M. DOUSOKY  Masahito SHOYAMA  Tamotsu NINOMIYA  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.9   pp.2265-2272
Publication Date: 2010/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2265
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Telecommunication Energy Technology in Conjunction with Main Topics of INTELEC'09)
DC-DC power conversion,  electromagnetic compatibility,  noise reduction,  frequency modulation,  programmed switching,  

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This paper investigates the effect of several frequency modulation profiles on conducted-noise reduction in dc-dc converters with programmed switching controller. The converter is operated in variable frequency modulation regime. Twelve switching frequency modulation profiles have been studied. Some of the modulation data are prepared using MATLAB software, and others are generated online. Moreover, all the frequency profiles have been designed and implemented using FPGA and experimentally investigated. The experimental results show that the conducted-noise spreading depends on both the modulation sequence profile and the statistical characteristics of the sequence. A substantial part of the manufacturing cost of power converters for telecommunication applications involves designing filters to comply with the EMI limits. Considering this investigation significantly reduces the filter size.