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. 25, 2013
Filed:
Mar. 17, 2010
Junichi Kanno, Tokyo, JP;
Junichi Kanno, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A protection device includes a voltage detector having N or more sub-circuits each for monitoring a specific battery cell to output a detection signal when at least one of the battery cells outputs an abnormal voltage. Each sub-circuit includes voltage dividing resistors, a reference voltage generator, and a comparator. The voltage dividing resistors generate a voltage division signal by dividing an output voltage of the battery cell. The reference voltage generator generates a reference voltage. The comparator compares the voltage division signal against the reference voltage. Each comparator is powered with voltage across the battery cell associated with the sub-circuit.