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:
Oct. 17, 1989
Filed:
Mar. 04, 1988
Jeffrey J Cybela, Glendale, WI (US);
Jerome J Reichard, Menomonee Falls, WI (US);
Square D Company, Palatine, IL (US);
Abstract
A switching network on a volatile memory circuit card assembly includes a back-up battery power supply to supply power to the volatile memory components upon failure of a line source of electrical power. A high capacitance capacitor acts as a power source to supply power to the memory components upon failure of the line source of power and before tha back-up battery power supply acts. This substantially increases the life of the battery. The switching network also provides a switch normally conducting the line source electrical power to the memory components and that isolates the memory components from the line source electrical power supply upon a failure. Switches also isolate a WRITE signal form the memory components and produce a PROTECT signal with a hysteresis effect. A second battery located off the card assembly can act to supply power before the first battery on the card assembly.