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. 12, 2004
Filed:
Jan. 17, 2003
Axel Pannwitz, Lennigen, DE;
Dialog Semiconductor GmbH, Kirchheim/Teck-Nabern, DE;
Abstract
The invention refers to a charge/discharge protection circuit for a rechargeable battery being able to differentiate between a temporary overvoltage on the charge/discharge terminals and a permanent overvoltage and in the last case for security reasons to permanently disconnect the battery from the charge/discharge terminals. Hereby said protection circuit comprises a number of partial switches ( [1:]), being either parallel to a load switch (LS) or parallel to the charge terminals, and an overvoltage detector ( ) which closes in case of an overvoltage all partial switches via a control logic ( ) and which afterwards opens one partial switch after the other. A voltage detector ( ), monitoring the remaining voltage over the partial switches, inhibits, however, the opening of at that time next partial switch if the remaining voltage over the still closed partial switches is higher than a predefined limit of said remaining voltage. In case the cycle is not completed within a predefined time interval, that means that after the time interval at least the last partial switch is still closed, the control circuit activates a permanent disconnection of the battery from charge terminals.