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:
Sep. 22, 1987
Filed:
Mar. 11, 1985
Josef Mahalek, Neufahrn, DE;
Egon Vetter, Hofheim, DE;
Telefunken electronic GmbH, Heilbronn, DE;
Abstract
The invention relates to a short circuit and overload protection circuit for output stage transistors based on the principle of power monitoring. The gist of the invention is that the collector emitter voltage of a power output stage transistor is detected by a limitation and threshold value network and a protective transistor whose collector drives the base of the driving transistor of the output stage and protects the latter from overload. The output stage transistor is driven in timed sequence or continuous operation. By a variation of the base current of the output stage transistor via a change in its base resistance, the response threshold of the protection device may be influenced within a large range.