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:
Apr. 10, 2007
Filed:
Aug. 10, 2004
Jon O. Reynolds, Appleton, WI (US);
David A. Stanzel, Appleton, WI (US);
Jon O. Reynolds, Appleton, WI (US);
David A. Stanzel, Appleton, WI (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
According to a first aspect of the invention a battery charger and method of charging a battery includes an input circuit that receive an ac input having a period of T seconds and provides a dc signal. A converter receives the first dc signal and provides a converter output across a dc bus having a peak voltage of V volts. An output circuit receives the dc signal and provides a battery charging signal having a power of P watts. A controller, controls the converter to provide power factor correction. A bus capacitor is connected across the dc bus and has a capacitance of at least (3PT)/(V) farads, or a capacitance to store sufficient energy to maintain the available output power signal through the duration of mechanical transient. The capacitance may be at least (4PT)/(V), (5PT)/(V), or (5.5PT)/(V). Multiple output circuits may be provided, connected either one at a time, or a number at a time.