ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,512,766, issued on Dec. 30, was assigned to Hitachi Ltd. (Tokyo).
"Power conversion device" was invented by Hiroshi Kamizuma (Tokyo), Akihiko Kanouda (Tokyo), Yuuichi Mabuchi (Tokyo) and Kimihisa Furukawa (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A plurality of power conversion units, a current sensor that detects a current at an output terminal of the power conversion unit, and a control unit that measures a frequency component in a predetermined frequency range of a current detected by the current sensor are included, the power conversion unit includes an AC/DC converter that outputs AC power at an input terminal to an output terminal, a s...