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:
Jun. 27, 2006
Filed:
Jun. 29, 2005
Michael D. Geren, Suwanee, GA (US);
Jennifer K. Collier, Meath, IE;
John E. Herrmann, Sugar Hill, GA (US);
Michael D. Geren, Suwanee, GA (US);
Jennifer K. Collier, Meath, IE;
John E. Herrmann, Sugar Hill, GA (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A battery protection circuit is provided that includes current monitoring circuit. The current monitoring circuit senses current flowing from a rechargeable cell. When the current exceeds a maximum value, the current monitoring circuit actuates, whereby opening a transistor. The transistor has a resistor coupled in parallel. When the transistor opens, current is forced through the resistor coupled in parallel with the transistor, thereby limiting the current to a maximum value. When the voltage across the resistor exceeds a predetermined threshold, an overcurrent condition is simulated in the lithium ion protection IC. The overcurrent condition causes a disconnect switch to open, thereby disconnecting the cell(s) from the external terminals. The circuit additionally includes three current blocking elements coupled between charging terminals and the cells to ensure that fault conditions occurring within the charger do not adversely affect the performance of either the cells or a host electronic device.