Magnetic Saturation Due to Fast Dynamic Response and Its Eliminating Method in Bridge-Type DC-DC Converter

Teruhiko KOHAMA  Sunao TOKIMATSU  Akio INOUE  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.8   pp.2165-2170
Publication Date: 2010/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2165
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Energy in Electronics Communications
magnetic saturation,  bridge-type converter,  fast transient response,  

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Method for eliminating magnetic saturation in low-voltage and high-current DC-DC converter with fast dynamic response is described. The magnetic saturation is observed in onboard isolated bridge-type DC-DC converter due to inherently asymmetrical PWM signal during transient condition. The saturation is not eliminated by using ac-coupling capacitor for transformer. Mechanism of the saturation is analyzed and confirmed by experiments. Based on the analysis a solution for the magnetic saturation is proposed. The effectiveness of proposed method is also confirmed by experiments.