Improving the Light-Load Regulation Capability of LLC Series Resonant Converter Using Impedance Analysis

Generally, an LLC series resonant converter (LLC SRC) is an attractive topology for applications, which require wide input variation and high conversion efficiency because of its wide gain capability and soft-switching capability. However, there is a regulation problem in which the output voltage increases as the load current decreases. In this paper, Bode plot and impedance asymptote analysis were conducted to obtain an intuitive sense of the regulation characteristic of LLC SRC under the light-load condition. Moreover, to improve the regulation capability, a new resonant tank with an additional capacitor is proposed. Its design guidelines were determined by Bode plot and impedance asymptote analysis. Therefore, the proposed LLC SRC achieves very light load regulation, while it maintains the advantages of typical LLC SRCs.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2017-09
Language
English
Keywords

BURST MODE; EFFICIENCY; DESIGN; RANGE

Citation

IEEE TRANSACTIONS ON POWER ELECTRONICS, v.32, no.9, pp.7056 - 7067

ISSN
0885-8993
DOI
10.1109/TPEL.2016.2629517
URI
http://hdl.handle.net/10203/223890
Appears in Collection
EE-Journal Papers(저널논문)
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