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Self-balanced modulation and magnetic rebalancing method for parallel multilevel inverters

United States Patent

9,831,800
November 28, 2017
View the Complete Patent 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)
The Florida State University Research Foundation, Inc. (Tallahassee, FL)
15/ 297,828
20170310240
October 19, 2016
GOVERNMENT INTEREST STATEMENT This invention was made with government support under DE-EE0006521 awarded by the Department of Energy. The government has certain rights in the invention.