US Patent Issued to Hong Kong Applied Science and Technology Research Institute on Oct. 7 for "Active variable inductor circuit" (Chinese Inventors)

ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,438,442, issued on Oct. 7, was assigned to Hong Kong Applied Science and Technology Research Institute Co. Ltd. (Hong Kong, Hong Kong).

"Active variable inductor circuit" was invented by Danting Xu (Hong Kong, Hong Kong), Yue Ma (Hong Kong, Hong Kong) and Chengyong Li (Hong Kong, Hong Kong).

According to the abstract* released by the U.S. Patent & Trademark Office: "A Switched-Mode Power Supply uses a primary winding of a transformer rather than an inductor. The secondary winding of the transformer is driven with a current generated by a negative inductance circuit. When the reverse current flows it can increase the equivalent inductance value of the primary windings. A steady-state d...