ALEXANDRIA, Va., April 21 -- United States Patent no. 12,609,631, issued on April 21, was assigned to DELTA ELECTRONICS INC. (Taoyuan City, Taiwan).

"Three-level power factor rectifier and method of operating the same" was invented by Yi-Li Su (Taoyuan City, Taiwan), Chien-Hung Liu (Taoyuan City, Taiwan), Wen-Lung Huang (Taoyuan City, Taiwan), Chang-Hung Liao (Taoyuan City, Taiwan) and Po-Yi Yeh (Taoyuan City, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A three-level power factor rectifier includes a diode bridge arm, a bridge arm assembly, an input inductor, a capacitor bank, and a controller. The first bridge arm includes a first switch, a second switch, a third switch, and a fourth switch connec...