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. 31, 2000
Filed:
Oct. 01, 1998
Louis Jay Vannatta, Crystal Lake, IL (US);
William P Alberth, Jr, Crystal Lake, IL (US);
Terrie Frane, Bloomingdale, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An electronic device includes an electrical circuitry interface (112) adapted for coupling with an energy source (106), a comparator (138), and a DC-DC converter circuitry (134) having a switch circuit (161) and an energy storage circuit (132). The switch circuit (161) is coupled to the electrical circuitry interface (112) and to the energy storage circuit (132), and is controlled to charge the energy storage circuit (132). A first input (166) of the comparator (138) is coupled to a voltage that varies with a nominal supply voltage of the energy source (106). A second input (168) of the comparator (138) is coupled to a threshold voltage. A comparator output (160) of the comparator (138) is coupled to the switch circuit (161). In operation, the DC-DC converter circuitry (134) charges the energy storage circuit (132) for a certain time period or until the stored voltage is greater then a desired voltage. The DC-DC converter circuitry (134) is controlled to stop charging the energy storage circuit (132) when current demands cause the energy source voltage to exceed a threshold voltage.