Frequency folding for LLC resonant converters in EV charging applications
To realize a wide voltage variation of electric vehicles (EV) battery packs, the conventional LLC converter needs to operate over a wide frequency range, which generally complicates the magnetics design and decreases the efficiency when the operating frequency is far away from the resonant frequency...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/172736 |
| _version_ | 1811689498222788608 |
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| author | Wu, Jiayang Li, Sinan Tan, Siew-Chong Hui, Ron Shu-Yuen |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Wu, Jiayang Li, Sinan Tan, Siew-Chong Hui, Ron Shu-Yuen |
| author_sort | Wu, Jiayang |
| collection | NTU |
| description | To realize a wide voltage variation of electric vehicles (EV) battery packs, the conventional LLC converter needs to operate over a wide frequency range, which generally complicates the magnetics design and decreases the efficiency when the operating frequency is far away from the resonant frequency. Responding to the challenge, a frequency folding technique is proposed and explained with an exemplary new LLC converter. The proposed converter utilizes both the inductive region and the capacitive region of the conventional LLC converter through a one-shot operation of the relay during the whole charging process. As the battery voltage increases, the converter switches from the capacitive region to the inductive region. Throughout the charging process, the operating frequency is effectively reduced, and zero-voltage switching is maintained, resulting in a relatively higher overall efficiency. A detailed description on the design procedure of the proposed converter is described. A scaled-down 400-W prototype with 200 V input and 120 V-210 V output range verified the advantages of the proposed concept and measured efficiency of 98% at the maximum output power. |
| first_indexed | 2024-10-01T05:49:03Z |
| format | Journal Article |
| id | ntu-10356/172736 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:49:03Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1727362023-12-20T01:06:19Z Frequency folding for LLC resonant converters in EV charging applications Wu, Jiayang Li, Sinan Tan, Siew-Chong Hui, Ron Shu-Yuen School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Electric Vehicles Charging Soft Switching To realize a wide voltage variation of electric vehicles (EV) battery packs, the conventional LLC converter needs to operate over a wide frequency range, which generally complicates the magnetics design and decreases the efficiency when the operating frequency is far away from the resonant frequency. Responding to the challenge, a frequency folding technique is proposed and explained with an exemplary new LLC converter. The proposed converter utilizes both the inductive region and the capacitive region of the conventional LLC converter through a one-shot operation of the relay during the whole charging process. As the battery voltage increases, the converter switches from the capacitive region to the inductive region. Throughout the charging process, the operating frequency is effectively reduced, and zero-voltage switching is maintained, resulting in a relatively higher overall efficiency. A detailed description on the design procedure of the proposed converter is described. A scaled-down 400-W prototype with 200 V input and 120 V-210 V output range verified the advantages of the proposed concept and measured efficiency of 98% at the maximum output power. Agency for Science, Technology and Research (A*STAR) This work was supported in part by Agency for Science, Technology and Research (A∗Star) MTC-IRG under Grant M21K2c0108 and in part by the Australian Research Council under DECRA Project under Grant DE210100473. 2023-12-18T06:53:16Z 2023-12-18T06:53:16Z 2023 Journal Article Wu, J., Li, S., Tan, S. & Hui, R. S. Y. (2023). Frequency folding for LLC resonant converters in EV charging applications. IEEE Transactions On Power Electronics, 38(4), 5041-5054. https://dx.doi.org/10.1109/TPEL.2023.3235114 0885-8993 https://hdl.handle.net/10356/172736 10.1109/TPEL.2023.3235114 2-s2.0-85147201439 4 38 5041 5054 en M21K2c0108 IEEE Transactions on Power Electronics © 2023 IEEE. All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Electric Vehicles Charging Soft Switching Wu, Jiayang Li, Sinan Tan, Siew-Chong Hui, Ron Shu-Yuen Frequency folding for LLC resonant converters in EV charging applications |
| title | Frequency folding for LLC resonant converters in EV charging applications |
| title_full | Frequency folding for LLC resonant converters in EV charging applications |
| title_fullStr | Frequency folding for LLC resonant converters in EV charging applications |
| title_full_unstemmed | Frequency folding for LLC resonant converters in EV charging applications |
| title_short | Frequency folding for LLC resonant converters in EV charging applications |
| title_sort | frequency folding for llc resonant converters in ev charging applications |
| topic | Engineering::Electrical and electronic engineering Electric Vehicles Charging Soft Switching |
| url | https://hdl.handle.net/10356/172736 |
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