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:
Apr. 19, 2016
Filed:
Jun. 28, 2013
Siemens Aktiengesellschaft, München, DE;
Reinhold Dillig, Memmelsdorf, DE;
Hubert Schierling, Erlangen, DE;
Thomas Schwinn, Herzogenaurach, DE;
SIEMENS AKTIENGESELLSCHAFT, München, DE;
Abstract
A frequency converter has an AC-DC converter and an inverter interconnected via a DC link having a first and a second circuit branch interconnected by a DC link capacitor and a commutation capacitor. To protect the AC-DC converter from damage caused by an overcurrent, the first circuit branch includes a choke in which a capacitor-side terminal is connected to a terminal of the DC link capacitor and a switch-side terminal is connected via a semiconductor switch to a DC link terminal of the AC-DC converter and also via a freewheeling diode to the second circuit branch. The semiconductor switch is configured to control a magnitude of an electric current flowing from the AC-DC converter into the DC link capacitor in accordance with a control signal.