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:
Mar. 31, 1981
Filed:
Jul. 12, 1979
Hans-Hermann Zander, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A static frequency converter comprising an intermediate DC voltage link, a rectifier, and an inverter having main thyristors in a bridge circuit, across which bypass diodes in a bridge circuit are shunted antiparallel, has a quenching circuit shunted across each bridge arm which includes a quenching thyristor, a commutating capacitor, and a commutating choke. There is a common commutating capacitor for each two bridge arms having a common main terminal and an energy-removing device, assigned to each commutating choke, is connected after the potential change has occurred at the corresponding output terminal of the inverter, at the end of each commutation. Energy stored in the commutating choke is taken out by the energy-removing device and over-voltage of the commutating capacitors is prevented.