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. 26, 2002
Filed:
Aug. 07, 1998
Eugene Aranovich, Middletown, NJ (US);
Edwin A. Muth, Aberdeen, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A reset device is disclosed which may be used in electrical devices such as portable telephones. The reset device includes a source, such as a rechargeable battery, which provides an input voltage and a threshold voltage. The reset device also has a comparator with a first input which receives the input voltage and a second input which receives the threshold voltage. A voltage changing device varies the threshold voltage in response to the output level of the comparator and a rate of increase of the input voltage. The voltage changing device includes a capacitor which delays an increase of the threshold voltage when the input voltage increases. Further, the voltage changing device includes a positive feedback resistor for increasing the threshold voltage when the output level increases. Thus, the positive feedback resistor allows switching the threshold voltage from a first threshold level to a second threshold level when the output level switches from a low level to a high level. The reset device further includes a regulator which regulates the input voltage to provide the threshold voltage. In addition, a switch is connected to an output of the comparator for providing a reset signal to a load. Illustratively, a controller receives the reset signal and resets the load, e.g., the portable phone. In response to the reset signal, the controller switches the portable phone between a dormant mode and an active mode. In addition, the controller allows trickle charging of the rechargeable battery in the dormant mode and rapid charging in the active mode.