NDLI: Analysis and Design of a Three-Level LLC Series Resonant Converter for High- and Wide-Input-Voltage Applications

Content Provider	IEEE Xplore Digital Library
Author	Il-Oun Lee Gun-Woo Moon
Copyright Year	1986
Abstract	In this paper, the analysis and design of a three-level LLC series resonant converter (TL LLC SRC) for high- and wide-input-voltage applications is presented. The TL LLC SRC discussed in this paper consists of two half-bridge LLC SRCs in series, sharing a resonant inductor and a transformer. Its main advantages are that the voltage across each switch is clamped at half of the input voltage and that voltage balance is achieved. Thus, it is suitable for high-input-voltage applications. Moreover, due to its simple driving signals, the additional circulating current of the conventional TL LLC SRCs does not appear in the converter, and a simpler driving circuitry is allowed to be designed. With this converter, the operation principles, the gain of the LLC resonant tank, and the zero-voltage-switching condition under wide input voltage variation are analyzed. Both the current and voltage stresses over different design factors of the resonant tank are discussed as well. Based on the results of these analyses, a design example is provided and its validity is confirmed by an experiment involving a prototype converter with an input of 400-600 V and an output of 48 V/20 A. In addition, a family of TL LLC SRCs with double-resonant tanks for high-input-voltage applications is introduced. While this paper deals with a TL LLC SRC, the analysis results can be applied to other TL LLC SRCs for wide-input-voltage applications.
Sponsorship	IEEE Power Electronics Society
Starting Page	2966
Ending Page	2979
Page Count	14
File Size	1795003
File Format	PDF
ISSN	08858993
Volume Number	27
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switches Zero voltage switching Capacitors Stress Rectifiers Logic gates three-level (TL) High and wide input voltage LLC series resonant converter (SRC)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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