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Open AccessArticle

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

1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
3
School of Electrical and Electronic Engineering, Hubei Polytechnic University, Huangshi 435003, China
*
Author to whom correspondence should be addressed.
Academic Editor: Chunhua Liu
Energies 2017, 10(10), 1448; https://doi.org/10.3390/en10101448
Received: 28 August 2017 / Revised: 11 September 2017 / Accepted: 12 September 2017 / Published: 21 September 2017
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. View Full-Text
Keywords: LLC resonant converter; stability; trajectory; mixed potential function; trigger control LLC resonant converter; stability; trajectory; mixed potential function; trigger control
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MDPI and ACS Style

Fang, Z.; Wang, J.; Duan, S.; Shao, J.; Hu, G. Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range. Energies 2017, 10, 1448.

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