ICCCAS Invited Speaker

Youhua Shi

Waseda University, Japan

Biography: Dr. Youhua Shi is a professor in the Department of Electronic and Physical Systems at Waseda University. He received his B.E. and M.E. degrees in Electric Engineering from Southeast University, China, in 1999 and 2002, respectively, and the Dr.Eng. degree in Electronics, Information and Communication from Waseda University, Tokyo, Japan, in 2005. He was appointed a full professor in the Faculty of Science and Engineering at Waseda University in 2017. His research spans various aspects of integrated system design, with a focus on energy harvesting, intelligent system design, and trustworthy computing. He is a member of Institute of Electrical and Electronics Engineers (IEEE), Institute of Electronics, Information and Communication Engineers of Japan (IEICE), Japan Society of Applied Physics (JSAP), Japanese Society for Artificial Intelligence (JSAI), and Information Processing Society of Japan (IPSJ).
Speech Title: Highly Efficient TENG-based Power Conversion Towards Low-Frequency-Low-Intensity Energy Harvesting
Abstract: Energy harvesting captures ambient energy from sources such as vibrations and thermal gradients, converting it into usable electrical energy, among which triboelectric nanogenerators (TENGs) can be successfully implemented to harvest mechanical energy from human movements when integrated into textiles, bracelets, or even organ motions, providing a sustainable power source for sensors and IoT devices. However, optimizing energy extraction from TENGs poses challenges due to their unique properties such as nonlinear time-varying internal capacitance, asymmetric outputs, and high voltages with low currents. This presentation explores advanced rectifier and converter topologies and then present our novel dual-output rectifier (DOR). We will present a practical implementation that evaluates various interface circuits tailored to our custom-built TENGs. The evaluation results demonstrate that our DOR significantly outperforms conventional full-wave rectifiers, achieving over 150 times the output under low-frequency and low-load conditions, showing the potential of optimized interface circuits to improve the practical deployment of TENGs in low-frequency-low-intensity energy harvesting applications.