ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,456,909, issued on Oct. 28, was assigned to AC BATTERY TECHNOLOGY LLC (East Lansing, Mich.).

"Modular multi-level inverter using cascaded H-bridges with charge balancing" was invented by Arthur William Matteson (East Lansing, Mich.) and Stanislav Todromovich (Richmond, Va.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A multi-level inverter using cascaded H-bridge modules, where each module can balance its at least two charge storage elements by means of voltage equalization. Modules are arranged in series into at least one cascade inverter phase with optional center taps, and modules communicate with a control unit by being addressed over at least one...