Mixed Resonant Frequency Control Improving Light-Load Efficiency of Full-Bridge LLC Converter

This letter introduces a mixed resonant frequency control improving the light-load efficiency of a full-bridge LLC converter. The proposed control significantly decreases the switching frequency under light-load condition, by inserting the subresonant freewheeling period caused by the magnetizing in...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2024-08, Vol.39 (8), p.9089-9094
Main Author: Kim, Jong-Woo
Format: Article
Language:English
Subjects:
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Burst mode
Data centers
efficiency
Electric converters
Frequency control
Inductors
light load
Loading
Prototypes
Resonant frequencies
Switches
Switching
Transformer cores
Transformers
Wires
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Summary:This letter introduces a mixed resonant frequency control improving the light-load efficiency of a full-bridge LLC converter. The proposed control significantly decreases the switching frequency under light-load condition, by inserting the subresonant freewheeling period caused by the magnetizing inductor of the transformer. By doing so, the operation of LLC converter becomes like a continuously operating burst mode, increasing the effective loading current. The advantages of the proposed control distinguished from the previous approaches are simple implementation, less switching losses, and zero impact on the dynamics. The effectiveness of the proposed control is verified through a prototype converter with a 400-300 V input and a 50 V/10 A output.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3392870