ALEXANDRIA, Va., July 21 -- United States Patent no. 12,689,309, issued on July 21, was assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC (Detroit).

"Multilevel direct current (DC) power source powering multilevel inverter" was invented by Muhammad Hussain Alvi (Troy, Mich.), Renato Amorim Torres (Pontiac, Mich.), Chandra S. Namuduri (Troy, Mich.) and Rashmi Prasad (Troy, Mich.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A multilevel inverter includes a set of inverter switches arranged in a multilevel inverter topology. The multilevel inverter topology has a high voltage (V) input, a low voltage input and an intermediate voltage input. A first voltage source connects the high voltage input to the intermedi...