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Energies 2018, 11(3), 579; https://doi.org/10.3390/en11030579

Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model

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
China Electric Power Research Institute, Wuhan 430074, China
4
School of Electrical and Electronic Engineering, Hubei Polytechnic University, Huangshi 435003, China
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 1 February 2018 / Accepted: 6 February 2018 / Published: 7 March 2018
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Abstract

In this paper, a rectifier current control for an LLC resonant converter is proposed, based on a simplified, two-order, linearized model that adds a rectifier current feedback inner loop to improve dynamic performance. Compared to the traditional large-signal model with seven resonant states, this paper utilizes a rectifier current state to represent the characteristics of the resonant states, simplifying the LLC resonant model from seven orders to two orders. Then, the rectifier current feedback inner loop is proposed to increase the control system damping, improving dynamic performance. The modeling and design methodology for the LLC resonant converter are also presented in this paper. A frequency analysis is conducted to verify the accuracy of the simplified model. Finally, a 200 W LLC resonant converter prototype is built to verify the effectiveness of the proposed control strategy. Compared to a traditional single-loop controller, the settling time and voltage droop were reduced from 10.8 ms to 8.6 ms and from 6.8 V to 4.8 V, respectively, using the proposed control strategy. View Full-Text
Keywords: LLC resonant converter; linearized model; rectifier current control; extended description function (EDF) LLC resonant converter; linearized model; rectifier current control; extended description function (EDF)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fang, Z.; Wang, J.; Duan, S.; Xiao, L.; Hu, G.; Liu, Q. Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model. Energies 2018, 11, 579.

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