The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 2025
Filed:
Aug. 26, 2022
Lenze Swiss Ag, Romanshorn, CH;
Andreas Burgermeister, Mauren, CH;
Lenze Swiss AG, Romanshorn, CH;
Abstract
A frequency converter has a first intermediate circuit arm on which a positive intermediate circuit potential is present during operation, a second intermediate circuit arm on which a negative intermediate circuit potential is present during operation, and an inverter having first and second input terminals. The inverter has a number of bridge arms, each of which has an upper and a lower semiconductor switching device. The upper and lower switching devices are looped in series between the first and second input terminals. A connection node of the upper and lower switching devices forms an inverter output terminal. A reactor is looped-in between the first circuit arm and the first input terminal. A shunt resistor is looped-in between the second circuit arm and the second input terminal. An evaluation unit detects, based on a voltage across the shunt resistor, a ground fault on the upper semiconductor switching devices of the inverter.