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李泽元教授 (Prof. Fred C. Lee)
美国弗吉尼亚理工大学 中国工程院外籍院士、美国工程院院士、IEEE Fellow 报告题目：Design Challenges of SiC Based High-Power, High-Frequency CLLC Resonant Converter with Wide Gain Range. |
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报告摘要： Generation 3 power semiconductor devices, such as SiC, offers significant reduction of switching losses in comparison with its counterpart IGBT for high power applications. In general, a factor of 2-3 increase in switching frequency is expected. In many DC/DC convertor applications where the gain range is relatively narrow, resonant convertors are already deemed a preferred choice. With ZVS turn-on and ZCS turn-off, resonant converters have been demonstrated with one order of magnitude increasing in switching frequency and with improved efficiency.
However, in many emerging high-power applications such as EV charging, renewable energy, and energy storage are featured with wide gain range, PWM converter with some form of soft switching are still in the mainstay. The subject of this presentation is about the propose means to overcome the challenges related to the wide gain range and means to operate beyond 100KHz , with much improved efficiency. The control strategies are proposed as follows, “flexible link voltage” to extend the operating range while high efficiency is critical; “shorting” mode to boosting the tank energy to realize high voltage gain; and “PWM” mode to enable much reduced frequency range while operating at light load. The proposed strategies together have changed the fundamental properties while removed the limitations of the CLLC converter, such that it is best suited for high power applications while wide gain range are required.
报告人简介： Dr. Lee is a University Distinguished Professor Emeritus at Virginia Tech. He is a member of the U.S. National Academy of Engineering, U.S. National Academy of Inventors, and a foreign member of the Chinese Academy of Engineering, China. Dr. Lee founded the Center for power electronics and led a program that encompasses research, technology development, educational outreach, industry collaboration, and technology transfer. To date, more than 230 companies worldwide have benefited from this industry partnership program.
Dr. Lee has supervised to completion 91 Ph.D. and 93 M.S. students. He holds over 100 US patents, and has published over 330 journal articles and more than 760 refereed technical papers. His research interests include high-frequency power conversion, magnetics and EMI, distributed power systems, renewable energy, power quality, high-density electronics packaging and integration, and modeling and control. Dr. Lee is a recipient of the 2015 IEEE Medal in Power Engineering “for contributions to power electronics, especially high-frequency power conversion." |
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论文初稿提交截止时间
(
2025年6月30日 2025年7月21日
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工业报告征集截止时间
(
2025年7月15日 2025年7月30日
)
专题讲座征集截止时间
(
2025年7月15日 2025年7月30日
)
论文录用通知时间
( 2025年8月15日 )
论文终稿提交时间
( 2025年9月15日 )
报名系统开放时间
( 2025年8月16日 )
大会时间
( 2025年11月7-10日 )
展览时间
( 2025年11月8日-9日 )