NDLI: Theoretical Evaluation of Stability Improvement Brought by Resonant Current Loop for Paralleled LLC Converters

Content Provider	IEEE Xplore Digital Library
Author	Sheng Zong Haoze Luo Wuhua Li Xiangning He Changliang Xia
Copyright Year	1982
Abstract	This paper presents a digitally master-slave controlled parallel system of multiple LLC resonant converters with an inner resonant current control loop in each module. Theoretical analysis of the stability of individual modules and the system with an inner resonant current loop is proposed based on the envelop model, which reveals the principle of the performance improvement brought by the resonant current control loop. Moreover, the inner resonant current loop eliminates the differences in small-signal characteristics among different static operating points, thus facilitating the voltage loop design. The analysis of parallel operation and a complete control loop design guide for paralleled LLC resonant converters is presented based on a small-signal model rather than on software simulation. Finally, the stability analysis and design are elaborated and verified through a 16-kW experimental system of four modularized LLC resonant converters.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	4170
Ending Page	4180
Page Count	11
File Size	3450640
File Format	PDF
ISSN	02780046
Volume Number	62
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage control Analytical models Transfer functions Stability criteria Bandwidth Admittance envelope model LLC resonant converter parallel system stability inner resonant current loop small-signal characteristics Envelope model
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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