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Multilevel DC link inverter

United States Patent

June 10, 2003
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A multilevel DC link inverter and method for improving torque response and current regulation in permanent magnet motors and switched reluctance motors having a low inductance includes a plurality of voltage controlled cells connected in series for applying a resulting dc voltage comprised of one or more incremental dc voltages. The cells are provided with switches for increasing the resulting applied dc voltage as speed and back EMF increase, while limiting the voltage that is applied to the commutation switches to perform PWM or dc voltage stepping functions, so as to limit current ripple in the stator windings below an acceptable level, typically 5%. Several embodiments are disclosed including inverters using IGBT's, inverters using thyristors. All of the inverters are operable in both motoring and regenerating modes.
Su; Gui-Jia (Knoxville, TN)
UT-Battelle, LLC (Oak Ridge, TN)
09/ 853,133
May 10, 2001
This invention was made with Government support under Contract No. DE-AC05-00OR22725 to UT-Battelle, LLC, awarded by the U.S. Department of Energy. The Government has certain rights in this invention.