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. 19, 1993
Filed:
Dec. 24, 1990
Hussein I Bittar, Huntington, IN (US);
Richard A Karlin, Chicago, IL (US);
MagneTek, Inc., Los Angeles, CA (US);
Abstract
Charging voltage and current control circuits for battery chargers provide for a constant output voltage above a first predetermined value of charging current and an increasing output voltage below the first predetermined value of charging current. The charger makes use of a pulse-width modulated control circuit utilizing a variable duty cycle proportional to charging current and couples a signal proportional to charging current via a diode-resistor network to the pulse-width modulator for values below the first predetermined value of charging current. A current limit control circuit provides a current limit function by driving the pulse-width modulator to a minimum duty cycle during overcurrent conditions.