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:
Sep. 02, 1980
Filed:
Jun. 27, 1978
William T Quarton, Englewood, CO (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
A battery charging circuit includes a switching transistor which controls the flow of charging current to the battery at a high rate or a low rate. The operation of the transistor is, in turn, controlled by a voltage sensing circuit which includes a voltage detector module characterized in a very low current drain. The battery is, in fact, isolated from the charging circuit by a diode; the sensing circuit, however, is not isolated from the battery by a diode. This arrangement permits a more sensitive voltage detection and a more accurate control over the switching transistor. A desirable switching hysteresis is built into the sensing circuit but is operable to allow the hysteresis loop to be eliminated for purposes of calibration.