IoT Seminar | Essential Energy Buffer-release Mechanisms for Realizing Motion-powered IoT Systems 动能收集技术与运动供能物联网应用
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Energy harvesting (EH) technology is developed to harness ambient energy in different physical forms. Although the available ambient energy is usually tiny, it brings out the convenience of onsite power generation by drawing energy from local sources, which meets the emerging power demand of long-lasting, extensively deployed, and maintenance-free Internet of Things (IoT). Kinetic energy harvesting (KEH) is one of the most promising EH solutions for the realization of battery-free IoT. In this talk, we first review the research emphases on KEH technology from different engineering disciplines in the last two decades. By clarifying the contributions of either part of structures, circuits, and systems, the energy buffer-release mechanism (EBRM) is identified as the most essential ingredient toward the practical implementation of a motion-powered IoT device. The energy and power criteria in the buffer and release processes must be respectively specified, such that the IoT operations can be successfully and reliably carried out. Taking some of the recent designs from the speakers’ research group, for example, we make a detailed analysis of different forms of EBRM toward the realization of a motion-powered IoT system. At the end of the talk, we will give live demos of some motion-powered and light-powered wireless devices and further draw some concluding remarks about the challenges and opportunities of the research on battery-free IoT systems.
Dr. Junrui Liang is a tenured Associate Professor at the School of Information Science and Technology and the Director of the Center for Intelligent Power and Energy Systems, ShanghaiTech University, China. He received his Ph.D. degree in Mechanical and Automation Engineering at The Chinese University of Hong Kong in 2010. Dr. Liang has interdisciplinary research and working experience in smart materials and structures, power electronics, and IoT systems and applications. His research interests include electromechanical dynamics, mechatronics, power conversion circuits and systems, low-energy IoT systems, renewable energy, etc. As of 2023, Dr. Liang has authored and co-authored more than 150 peer-reviewed technical papers in international journals and conferences. He is ranked among the world’s top 2% scientists in the lists released by Stanford University and Elsevier. He and his students have received several paper awards in conferences such as ICAST 2008, IEEE ICIA 2009 & 2010, ASME SMASIS 2020, VEH 2021 & 2022+1, IEEE IESES 2023, and SMSS 2023. Dr. Liang serves as an Associate Editor for IEEE Transactions on Circuits and Systems II: Express Briefs and IET Circuits, Devices & Systems. He was the General Chair of the 2nd International Conference on Vibration and Energy Harvesting Applications (VEH 2019) and Track Chair of the IEEE International Symposium of Circuits and Systems (IEEE ISCAS 2023 & 2024). In 2022, Dr. Liang and his colleagues founded ViPSN Ltd. (vipsn.cc), a small business focusing on self-powered IoT systems and applications.