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. 22, 2000
Filed:
Oct. 19, 1999
Applicant:
Inventor:
Quang Tran, Mississauga, CA;
Assignee:
IVI Checkmate Ltd., Toronto, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ; H02J / ;
U.S. Cl.
CPC ...
363 20 ; 307 64 ;
Abstract
A backup power circuit provides reserve power to a terminal device in the event of loss of power from the main power source. In the terminal device, the main power source is connected to a power circuit which generates two different voltage signals used by different circuits therein. The backup power circuit selectively stores energy from the higher voltage signal and supplies the stored energy to the power circuit when the main power fails, thereby allowing the power circuit to generate the lower voltage signal.