ALEXANDRIA, Va., June 16 -- United States Patent no. 12,308,755, issued on May 20, was assigned to Lenze Swiss AG (Romanshorn, Switzerland).
"Frequency converter" was invented by Andreas Burgermeister (Mauren, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A frequency converter includes an intermediate circuit capacitor at which an intermediate circuit voltage is present, an inverter for generating control signals with a variable frequency and a variable amplitude from the intermediate circuit voltage, and a circuit for measuring the intermediate circuit voltage. The circuit for measuring the intermediate circuit voltage includes a resistive voltage divider, the intermediate circuit voltage being...