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:
Mar. 21, 2000
Filed:
May. 28, 1999
Matthew D Mottier, Lake Zurich, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A battery charger (100) with active feedback voltage controller includes a pass device (144), such as a metal-oxide-semiconductor field-effect transistor (MOSFET), and uses either hardware, software, or a combination of hardware and software, to implement an active feedback voltage controller (130). The active feedback voltage controller (130) reduces the control voltage to a tracking regulator (110) which in turn reduces the power dissipation of the pass device (144) and allows for a smaller pass device to be implemented in the battery charger (100) while maintaining the desired charging current as determined by a current controller (120). With software flexibility, many types of batteries can be efficiently charged to capacity, including nickel-cadmium (NiCad), nickel-metal-hydride (NiMH), and lithium-ion (LiIon) batteries.