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:
May. 21, 1996
Filed:
Sep. 30, 1993
Applicant:
Inventors:
Terrance J Goedken, Mundelein, IL (US);
Daniel J Theobald, Woodstock, IL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
320 35 ; 320 31 ;
Abstract
A control circuit and method of operating a battery charging system are provided capable of disabling charging of a rechargeable battery (320) based upon a second derivative (410) of a temperature of the battery. A thermistor (330), contained in a rechargeable battery pack together with the rechargeable battery (320), detects the temperature of the battery. Charging of the battery can be disabled when the second derivative (410) of the temperature of the battery is positive and the first derivative (390) of the temperature of the battery is higher than a predetermined threshold.