US Patent Issued to ABB Schweiz on Sept. 9 for "Filter capacitance estimation by resonance frequency determination" (Finnish Inventors)

ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,413,145, issued on Sept. 9, was assigned to ABB Schweiz AG (Baden, Switzerland).

"Filter capacitance estimation by resonance frequency determination" was invented by Vili Vainola (Espoo, Finland) and Jarno Kukkola (Helsinki).

According to the abstract* released by the U.S. Patent & Trademark Office: "Described herein is a method of estimating a quantity dependent on a capacitance (Cf) of an electrical filter connected to an AC side of an electrical converter. The method includes injecting a plurality of frequency components into a voltage reference of the electrical converter; operating the electrical converter with the voltage reference by determining switching commands from the vo...