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. 05, 1977
Filed:
Aug. 12, 1975
Andreas Boehringer, Stuttgart, DT;
Robert Bosch G.m.b.H., Stuttgart, DT;
Abstract
A cyclical ON-OFF control signal is generated with a predetermined duty cycle to energize a load through a semi-conductor switch; a trouble signal is generated, for example by sensing voltage across the load, across the switch, temperature or the like, and, when the trouble signal exceeds a certain threshold (as determined, for example, by comparing the trouble signal with a reference in a differentially connected operational amplifier), the ON-signal to gate the switch ON is interrupted; and an OFF cycle of the cyclical generating means is started; if the trouble signal disappears, the normal cyclical repetition rate continues. A minimum interruption time is, however, provided determined by the OFF period of the cyclical generator and/or circuit components.