Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model
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 p...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-03-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/3/579 |
| _version_ | 1811185172365705216 |
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| author | Zhijian Fang Junhua Wang Shanxu Duan Liangle Xiao Guozheng Hu Qisheng Liu |
| author_facet | Zhijian Fang Junhua Wang Shanxu Duan Liangle Xiao Guozheng Hu Qisheng Liu |
| author_sort | Zhijian Fang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T13:25:04Z |
| format | Article |
| id | doaj.art-b20b2364fff249abac66df5130ed52b9 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:25:04Z |
| publishDate | 2018-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-b20b2364fff249abac66df5130ed52b92022-12-22T04:22:06ZengMDPI AGEnergies1996-10732018-03-0111357910.3390/en11030579en11030579Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized ModelZhijian Fang0Junhua Wang1Shanxu Duan2Liangle Xiao3Guozheng Hu4Qisheng Liu5School of Electrical Engineering, Wuhan University, Wuhan 430072, ChinaSchool of Electrical Engineering, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaChina Electric Power Research Institute, Wuhan 430074, ChinaSchool of Electrical and Electronic Engineering, Hubei Polytechnic University, Huangshi 435003, ChinaSchool of Electrical Engineering, Wuhan University, Wuhan 430072, ChinaIn 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.http://www.mdpi.com/1996-1073/11/3/579LLC resonant converterlinearized modelrectifier current controlextended description function (EDF) |
| spellingShingle | Zhijian Fang Junhua Wang Shanxu Duan Liangle Xiao Guozheng Hu Qisheng Liu Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model Energies LLC resonant converter linearized model rectifier current control extended description function (EDF) |
| title | Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model |
| title_full | Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model |
| title_fullStr | Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model |
| title_full_unstemmed | Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model |
| title_short | Rectifier Current Control for an LLC Resonant Converter Based on a Simplified Linearized Model |
| title_sort | rectifier current control for an llc resonant converter based on a simplified linearized model |
| topic | LLC resonant converter linearized model rectifier current control extended description function (EDF) |
| url | http://www.mdpi.com/1996-1073/11/3/579 |
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