OVERCHARGE PROTECTIVE CIRCUIT, BATTERY PACK USING THE SAME AND CELLULAR PHONE

摘要

<P>PROBLEM TO BE SOLVED: To provide an overcharge protective circuit capable of maintaining overcharge protection even if voltage ripples of a charging voltage are large. Ž<P>SOLUTION: The overcharge protective circuit includes: a comparing section 111 for comparing a charging voltage of a lithium ion battery with a first reference voltage and a second reference voltage lower than the first reference voltage, and outputting a first control signal when the charging voltage exceeds the first reference voltage and outputting a second control signal when the charging voltage becomes lower than the second reference voltage; a first control section 113 for interrupting the charging of the lithium ion battery in response to the first control signal and resuming the charging in response to the second control signal; and a second control section 121 for inhibiting the charging resume operation based on the second control signal by the control section, if a time of continuously outputting the first signal at a period shorter than a predetermined period exceeds a predetermined time. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž