Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger
LLC resonant converter is one of the most commonly adopted topologies for electric vehicle (EV) battery charging. However, due to the wide variation range of battery voltages, applying conventional LLC resonant converters usually results in relatively larger magnetic size and lower power density. Th...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160481 |
| _version_ | 1826129832434466816 |
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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 | LLC resonant converter is one of the most commonly adopted topologies for electric vehicle (EV) battery charging. However, due to the wide variation range of battery voltages, applying conventional LLC resonant converters usually results in relatively larger magnetic size and lower power density. This article presents a novel approach to improve the power density performance of LLC resonant converters for EV charging. It leverages the existing capacitor-clamped LLC topology, which was originally proposed for applications needing overcurrent protection, while innovatively operating the converter in the capacitive (rather than inductive) region of conventional LLC resonant converters. Results in this work using our proposed design method show that when working in the capacitive region, the capacitor-clamped LLC converter can not only realize zero-voltage switching in the MOSFETs and zero-current switching in the output diodes but also significantly reduce the flux linkage requirement in the transformer compared to conventional LLC. This leads to an elegant solution that optimally minimizes the size of magnetics for increased power density while reducing costs. The merits of the capacitor-clamped LLC converter with the proposed design method are validated by a 400 W, 200 V input, 125-210 V output range prototype, which achieves an efficiency of 98.13% at the maximum output power. |
| first_indexed | 2024-10-01T07:46:59Z |
| format | Journal Article |
| id | ntu-10356/160481 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:46:59Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1604812022-08-02T05:40:20Z Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger Wu, Jiayang Li, Sinan Tan, Siew-Chong Hui, Ron Shu-Yuen School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Electric Vehicle Charging High Power Density LLC resonant converter is one of the most commonly adopted topologies for electric vehicle (EV) battery charging. However, due to the wide variation range of battery voltages, applying conventional LLC resonant converters usually results in relatively larger magnetic size and lower power density. This article presents a novel approach to improve the power density performance of LLC resonant converters for EV charging. It leverages the existing capacitor-clamped LLC topology, which was originally proposed for applications needing overcurrent protection, while innovatively operating the converter in the capacitive (rather than inductive) region of conventional LLC resonant converters. Results in this work using our proposed design method show that when working in the capacitive region, the capacitor-clamped LLC converter can not only realize zero-voltage switching in the MOSFETs and zero-current switching in the output diodes but also significantly reduce the flux linkage requirement in the transformer compared to conventional LLC. This leads to an elegant solution that optimally minimizes the size of magnetics for increased power density while reducing costs. The merits of the capacitor-clamped LLC converter with the proposed design method are validated by a 400 W, 200 V input, 125-210 V output range prototype, which achieves an efficiency of 98.13% at the maximum output power. This work was supported in part by the Hong Kong Research Grant Council under GRF Project 17205817 and in part by the Australian Research Council under DECRA Project DE210100473. 2022-07-25T05:53:59Z 2022-07-25T05:53:59Z 2021 Journal Article Wu, J., Li, S., Tan, S. & Hui, R. S. (2021). Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger. IEEE Transactions On Power Electronics, 36(10), 11456-11468. https://dx.doi.org/10.1109/TPEL.2021.3068693 0885-8993 https://hdl.handle.net/10356/160481 10.1109/TPEL.2021.3068693 2-s2.0-85103284576 10 36 11456 11468 en IEEE Transactions on Power Electronics © 2021 IEEE. All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Electric Vehicle Charging High Power Density Wu, Jiayang Li, Sinan Tan, Siew-Chong Hui, Ron Shu-Yuen Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger |
| title | Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger |
| title_full | Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger |
| title_fullStr | Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger |
| title_full_unstemmed | Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger |
| title_short | Capacitor-clamped LLC resonant converter operating in capacitive region for high-power-density EV charger |
| title_sort | capacitor clamped llc resonant converter operating in capacitive region for high power density ev charger |
| topic | Engineering::Electrical and electronic engineering Electric Vehicle Charging High Power Density |
| url | https://hdl.handle.net/10356/160481 |
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