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SELF-BALANCED MODULATION AND MAGNETIC REBALANCING METHOD FOR PARALLEL MULTILEVEL INVERTERS

United States Patent Application

20170310240
A1
View the Complete Application at the US Patent & Trademark Office
A self-balanced modulation method and a closed-loop magnetic flux rebalancing control method for parallel multilevel inverters. The combination of the two methods provides for balancing of the magnetic flux of the inter-cell transformers (ICTs) of the parallel multilevel inverters without deteriorating the quality of the output voltage. In various embodiments a parallel multi-level inverter modulator is provide including a multi-channel comparator to generate a multiplexed digitized ideal waveform for a parallel multi-level inverter and a finite state machine (FSM) module coupled to the parallel multi-channel comparator, the FSM module to receive the multiplexed digitized ideal waveform and to generate a pulse width modulated gate-drive signal for each switching device of the parallel multi-level inverter. The system and method provides for optimization of the output voltage spectrum without influence the magnetic balancing.
Li, Hui (Tallahassee, FL), Shi, Yanjun (Tallahassee, FL)
15/ 297,828
October 19, 2016
GOVERNMENT INTEREST STATEMENT [0002] This invention was made with government support under DE-EE0006521 awarded by the Department of Energy. The government has certain rights in the invention.