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:
Dec. 16, 2003
Filed:
Apr. 24, 2000
Gerd Griepentrog, Gutenstetten, DE;
Reinhard Maier, Herzogenaurach, DE;
Heinz Mitlehner, Uttenreuth, DE;
Erich Zerbian, Fensterbach, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A protection device includes a measurement device and a downstream evaluation device. The evaluation device is a unit for early short-circuit identification which actuates a semiconductor switch, which is preferably produced based on silicon carbide. The unit for early short-circuit identification preferably operates with switching thresholds which can be predetermined for the product of the current and the current rate of change, or on the basis of tolerant locus curves. In the latter case, different power factors (0.1<cos <0.9) are used in the locus curves in a locus curve representation of the current and current rate of change. The semiconductor switch preferably contains two back-to-back series-connected switching elements based on silicon carbide.