Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range

Zhijian Fang, Junhua Wang, Shanxu Duan, Jianwei Shao and Guozheng Hu
Additional contact information
Zhijian Fang: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Junhua Wang: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Shanxu Duan: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Jianwei Shao: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Guozheng Hu: School of Electrical and Electronic Engineering, Hubei Polytechnic University, Huangshi 435003, China

Energies, 2017, vol. 10, issue 10, 1-21

Abstract: The gain of a LLC resonant converter can vary with the loads that can be used to improve the efficiency and power density for some special applications, where the maximum gain does not apply at the heaviest loads. However, nonlinear gain characteristics can make the converters unstable during a major disturbance. In this paper, the stability of an LLC resonant converter during a major disturbance is studied and a trigger control scheme is proposed to improve the converter’s stability by extending the converter’s operational range. Through in-depth analysis of the gain curve of the LLC resonant converter, we find that the switching frequency range is one of the key factors determining the system’s stability performance. The same result is also obtained from a mathematical point of view by utilizing the mixed potential function method. Then a trigger control method is proposed to make the LLC resonant converter stable even during a major disturbance, which can be used to extend the converter’s operational range. Finally, experimental results are given to verify the analysis and proposed control scheme.

Keywords: LLC resonant converter; stability; trajectory; mixed potential function; trigger control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
https://www.mdpi.com/1996-1073/10/10/1448/pdf (application/pdf)
https://www.mdpi.com/1996-1073/10/10/1448/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:10:y:2017:i:10:p:1448-:d:112706

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().