Education
Ph.D. 1988, Electrical Engineering, Virginia Polytechnic Institute and State University
M.S. 1984, Electrical Engineering, California Institute of Technology
M.Eng.Sc. 1983, Electrical Engineering, University of New South Wales, Australia
B.E. 1980, Electrical Engineering, University of New South Wales, Australia
B.Sc. 1977, Mathematics, University of New South Wales, Australia
Research Interests
In all areas of power processing, reductions in size and weight and improvement in transient response result from increasing the internal operating frequency of converters. My research centers on the investigation and analysis of different converter technologies suited to high-frequency operation. Two different analysis approaches are being pursued. First, modeling the switching elements as a three-terminal device and then proceeding in an analogous fashion to ordinary transistor circuit analysis represents a major simplification over previous modeling methodologies. Second, the exact analysis of converters using a state space approach lends itself to computer implementation as a general converter CAD tool.
Power electronics research at PSU makes use of a well-equipped laboratory which features, among other modern instrumentation, a computer-controlled impedance/gain-phase analyzer used in component characterization and transfer function measurement.
Selected Publications
D. Li, R. Tymerski, T. Ninomiya, "PECS-An Efficient Solution for Simulating Switched Networks with Nonlinear Elements," IEEE Transactions on Industrial Electronics, 367-376, 2001.
D. Li, R. Tymerski, "Comparison of Simulation Algorithms for Accelerated Determination of Periodic Steady State of Switched Networks," IEEE Transactions on Industrial Electronics, vol. 47, 1278-1285, 2000.
G. Wallis, R. Tymerski, "Generalized Approach for µ Synthesis of Robust Switching Regulators," IEEE Transactions on Aerospace and Electronic Systems, vol. 36, 422-431, 2000.
T. Kohama, T. Ninomiya, M. Shoyama, R. Tymerski, "Analysis of Abnormal Phenomena Caused by Synchronous Rectifiers in a Paralleled Converter System," IEEE Transactions on Power Electronics, vol. 15, no. 4, 670-680, 2000.
D. Li, R. Tymerski, T. Ninomiya, "Chebyshev Series Integration Method for Transient Simulation of Switched Networks," IEEE Transactions on Industrial Electronics, vol. 47, no. 2, 305-314, 2000.
