Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model
High-frequency start-up strategy is usually used to limit the current overshoot in the resonant tank of LLC converter. However, the strong coupling among start-up frequency, initial duty cycle, and current limit increases the design complexity of parameters. This paper proposes a parameter optimizat...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | Energy Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484723008612 |
| _version_ | 1827582128382017536 |
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| author | Ning Li Yujie Cao Yan Zhang Zhuang Li Lin Jiang Xiao-Ping Zhang |
| author_facet | Ning Li Yujie Cao Yan Zhang Zhuang Li Lin Jiang Xiao-Ping Zhang |
| author_sort | Ning Li |
| collection | DOAJ |
| description | High-frequency start-up strategy is usually used to limit the current overshoot in the resonant tank of LLC converter. However, the strong coupling among start-up frequency, initial duty cycle, and current limit increases the design complexity of parameters. This paper proposes a parameter optimization strategy of the LLC converter soft start-up process based on the numerical calculation method. With this strategy, the initial switching frequency and duty cycle are determined adaptively according to the given maximum current requirements during the start-up process. The current overshoot is suppressed and soft switching is achieved in the whole process. After the second switching period, 50% duty cycle operation occurs without oscillation. Furthermore, exponential frequency reduction is used in the process, and the current overshoot limiting condition in the initial period is discussed. Finally, a 240 W LLC converter prototype is built to verify the correctness of the theoretical analysis in this paper. In terms of current limiting, soft switching, and initial switching frequency, the comprehensive performance of the soft start-up control strategy proposed in this paper is better. Compared to the traditional control strategy, the current overshoot is reduced by 45.6%. The theoretical calculation, simulation, and experimental results are consistent. |
| first_indexed | 2024-03-08T22:46:06Z |
| format | Article |
| id | doaj.art-3968218789264ddc9dba890d84cb3a2b |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-03-08T22:46:06Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-3968218789264ddc9dba890d84cb3a2b2023-12-17T06:38:53ZengElsevierEnergy Reports2352-48472023-10-019909919Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation modelNing Li0Yujie Cao1Yan Zhang2Zhuang Li3Lin Jiang4Xiao-Ping Zhang5School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China; Corresponding authors.School of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, ChinaDepartment of Electrical Engineering and Electronics, University of Liverpool, Liverpool, L69 3GJ, UK; Corresponding authors.Department of Electronic, Electrical, and Systems Engineering, School of Engineering, University of Birmingham, Birmingham, B15 2TT, UKHigh-frequency start-up strategy is usually used to limit the current overshoot in the resonant tank of LLC converter. However, the strong coupling among start-up frequency, initial duty cycle, and current limit increases the design complexity of parameters. This paper proposes a parameter optimization strategy of the LLC converter soft start-up process based on the numerical calculation method. With this strategy, the initial switching frequency and duty cycle are determined adaptively according to the given maximum current requirements during the start-up process. The current overshoot is suppressed and soft switching is achieved in the whole process. After the second switching period, 50% duty cycle operation occurs without oscillation. Furthermore, exponential frequency reduction is used in the process, and the current overshoot limiting condition in the initial period is discussed. Finally, a 240 W LLC converter prototype is built to verify the correctness of the theoretical analysis in this paper. In terms of current limiting, soft switching, and initial switching frequency, the comprehensive performance of the soft start-up control strategy proposed in this paper is better. Compared to the traditional control strategy, the current overshoot is reduced by 45.6%. The theoretical calculation, simulation, and experimental results are consistent.http://www.sciencedirect.com/science/article/pii/S2352484723008612LLC converterSoft start-upNumerical modelCurrent limiting |
| spellingShingle | Ning Li Yujie Cao Yan Zhang Zhuang Li Lin Jiang Xiao-Ping Zhang Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model Energy Reports LLC converter Soft start-up Numerical model Current limiting |
| title | Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model |
| title_full | Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model |
| title_fullStr | Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model |
| title_full_unstemmed | Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model |
| title_short | Parameter optimization strategy of LLC converter soft start-up process based on a simplified numerical calculation model |
| title_sort | parameter optimization strategy of llc converter soft start up process based on a simplified numerical calculation model |
| topic | LLC converter Soft start-up Numerical model Current limiting |
| url | http://www.sciencedirect.com/science/article/pii/S2352484723008612 |
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