NDLI: A Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-Voltage Range Applications

Content Provider	IEEE Xplore Digital Library
Author	Hu, H. Fang, X. Chen, F. Shen, Z. J. Batarseh, I.
Copyright Year	1986
Abstract	This paper proposed a modified LLC converter with two transformers in series, which has four operation configurations, covering the range of four times the minimum input voltage. To optimize the proposed LLC converter in an attempt to achieve good efficiency, a numerical method is developed based on the LLC converter's steady-state equations. In order to minimize the magnetizing current and thus minimize the conduction and core losses, an optimal objective is proposed to find the maximum magnetizing inductance. An optimization procedure and a design example are given. A 250-W 210-V output prototype with input voltage ranging from 25 to 100 V is built to verify the developed numerical model and optimal design method. The dc gain obtained from experimental data agrees pretty well with that from the developed numerical model. Two conventional LLC converters are designed using fundamental harmonic approximation and the proposed optimal design, respectively, to make comparison with the proposed LLC converter and validate the proposed optimal design. Experimental results show that the proposed converter with proposed optimal design can achieve the peak efficiency up to 98%, while maintaining a very wide input voltage range.
Sponsorship	IEEE Power Electronics Society
Starting Page	1946
Ending Page	1960
Page Count	15
File Size	1841176
File Format	PDF
ISSN	08858993
Volume Number	28
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance Switches Bridge circuits Inductance Rectifiers Equations Mathematical model optimization DC Gain LLC converter microinverter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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