A Current Mode Analysis on Ground Leakage Current Noise Generation in Unbalanced and Balanced Switching Converters

Terdsak INTACHOT  Nontawat CHULADAYCHA  Yothin PREMPRANEERACH  Shuichi NITTA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.8   pp.2142-2157
Publication Date: 2010/08/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
common-mode current,  norton equivalent circuit,  unbalanced half-bridge converter,  balanced full-bridge converter,  ground leakage current,  EMC,  

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Summary: 
This paper presents the new switching converter model used for analyzing the generation mechanism of ringing ground leakage (GL) current, generated during the transient, at switch on/off of any switching converter. By applying the Norton model, the proposed new model of switching converter can be formulated. The ringing GL current is evaluated at the switching on/off of the unbalanced (half-bridge converter) and the balanced converter (full-bridge converter) for bidirectional D.C. motor drive used as an example. It is concluded that the measured and simulated results of the generated GL current agree well with the numerical analysis results, analyzed by the proposed new model of switching converter, in terms of the minimum or maximum peak currents and the ringing frequency.