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From Extended Binary Number Representation to Switched Capacitors DC-DC Converters

Dr. Sam Ben-Yaakov
Thursday, November 6, 2008
1:00PM - Harris Center 101

Abstract


Switched-Capacitor Converters (SCC) are preferred over inductor based switch-mode regulators in low power applications that call for small size, or if the electromagnetic field radiated from the switched inductor may pose a problem. However, SCC suffer from a fundamental power loss deficiency that make their use in some applications prohibitive. The power loss is due to the inherent energy dissipation when a capacitor that is charged to a given voltage is connected to a voltage source or another capacitor of a different voltage. This drawback of the SCC was alleviated in this work by developing a new class of switched capacitor DC-DC converters that are based on the properties of a novel Extended Binary Number (EXB) sequence which is akin to the Signed Binary Number Representation (SBNR) that has been described earlier in the literature.

The seminar will include an overview of present switched capacitor converters technology, will present the concept and features of the new EXB sequences and will detail the rules for translating these sequences into SCC topologies. Simulation and experimental results will be presented to demonstrate the engineering viability of the new SCC concept.

Short Bio


Shmuel (Sam) Ben-Yaakov has more than 40 years of engineering experience as a designer, entrepreneur, consultant and educator. He received the BSc degree in Electrical Engineering from the Technion, Haifa Israel, in 1961 and the MS and PhD degrees in Engineering from the UCLA, in 1967 and 1970 respectively. He is presently an independent consultant and Emeritus Professor of the Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel, and heads the Power Electronics Group there (http://www.ee.bgu.ac.il/~pel). He served as the Chairman of that department during the period 1985 - 1989. Prof. Ben-Yaakov has published over 300 scientific and technical papers and holds (as an inventor) 15 patents. He presented many tutorials in conferences and in the industrial environment as in-house seminars. His current research interests include power electronics, circuits and systems, electronic instrumentation and engineering education. Prof. Ben-Yaakov serves as a consultant to companies worldwide on design-oriented theoretical issues as well as on product development.

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