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. 14, 1981
Filed:
Jun. 08, 1979
Albrecht Schwarz, Gerlingen, DE;
Peter Pfeffer, Lauffen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To reliably turn OFF a pulse-controlled thyristor in series with a battery supplied motor circuit, in case of malfunction of the control circuit, or even of the supervisory circuit itself, the voltage across the thyristor is sensed and, if an ON condition of the thyristor, as represented by sensed voltage, is determined while the pulse source does not provide an ON command, a disabling control signal is applied to the pulse source to provide an OFF command; in case of failure of the sensing element, an additional voltage is supplied, through a time delay circuit to the disabling input. Time delay circuits are interposed between the respective sensed signal and command signal and applied through a logic circuit to prevent spurious operation of the monitoring and safety circuit.