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Loss Evaluation and Efficiency Enhancement of an LLC Converter
Toshiyuki WATANABE Fujio KUROKAWA
IEICE TRANSACTIONS on Communications
Publication Date: 2020/09/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Energy in Electronics Communications
phase-shift converter, LLC converter, high efficiency, winding loss, AC resistance,
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This paper presents a comparative loss analysis performed between an LLC converter and a phase-shift converter under the same size conditions using a power supply manufactured for information communications equipment. It is also shown herein that the LLC converter has a much higher ratio of transformer loss to total loss than the phase-shift converter and that the cause is the difference in the number of transformer turns between the two converters. Further, the ON-resistance of the secondary-side rectifier element and the number of transformer primary turns are shown to determine which of the two converters is superior in terms of low loss.