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:
Aug. 23, 1983
Filed:
Aug. 27, 1981
David L Cave, Tempe, AZ (US);
Gary L Maulding, Palm Bay, FL (US);
Howard F Weber, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
The self-protecting load driver circuit includes an output transistor having an emitter coupled to a current sensor and a collector adapted to be coupled to the electrical load. A comparator senses the magnitude of a current sensor signal and applies trigger signals to a time delay circuit which is connected between the output of the comparator and the control terminal of a control circuit for the protected transistor. The rise time of the voltage across the current sensor depends on the inductance, for instance, of the load. The time delay circuit enables the control circuit to disable the output transistor for a predetermined time duration in response to the threshold voltage of the comparator being exceeded by the sensor voltage. At other times, the protected transistor is saturated by the control circuit so that power is delivered to the load.