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:
Apr. 30, 2002
Filed:
Apr. 12, 2000
Tsutomu Ando, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
A charge control circuit which prevents charging of a battery when a charger is connected to the battery when the voltage of the battery is not above a threshold voltage of a MOS inverter circuit. Under such a condition, a charge control switch is turned off and charging current is cut off so that charging of the abnormal battery is inhibited and destruction or explosion of the battery is prevented. First and second circuits monitor the battery voltage, the second circuit having for comparing the battery voltage to a threshold voltage of a MOS transistor, and a logic circuit performs a logic operation on the outputs of the two circuits so that charging of the battery is prevented when the battery voltage is not higher than the threshold voltage of the MOS transistor.