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:
May. 07, 1985
Filed:
Nov. 12, 1982
Applicant:
Inventor:
Richard C Ray, Randolph Township, Morris County, NJ (US);
Assignee:
AT&T Bell Laboratories, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364483 ; 364492 ; 364200 ;
Abstract
A power failure detector for an off-line switcher provides an indication of power failure to a microprocessor load to permit an orderly shutdown without loss of data. The failure detector includes a voltage storage device shunting a secondary winding of a converter power transformer prior to the isolating diode. When its voltage drops below a preset threshold, the microprocessor load is notified that a shutdown action is to be taken.