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. 08, 2003
Filed:
Nov. 20, 2000
Robert George Emberty, Tucson, AZ (US);
Eric Y. K. Hew, Tucson, AZ (US);
Craig Anthony Klein, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An AC power interruption detection system is provided which compares an AC signal with a phased AC reference signal to determine the presence or absence of an AC power signal. By comparing the AC power signal with a phased reference signal, power interruption detection occurs within a predetermined minimum time frame, for example, with ½ cycle. In exemplary embodiments, the detection system includes AC power signal frequency multiplying circuitry to improve speed and performance. In other exemplary embodiments, the detection system includes threshold detection circuitry to detect undervoltage (e.g., brownout) and/or overvoltage (e.g., spike) conditions of the AC power. In system-level embodiments, the interruption detection system is implemented in a switch array environment in which a switch controller controls a redundant switch array based on the detection signal generated by the power interruption detection system to couple a selected AC power line, from one or more redundant AC power lines available, to a load.