Portable device having a charging circuit and semiconductor...

Details Portable device having a charging circuit and semiconductor... Portable device having a charging circuit and semiconductor...

Filed on

2006-05-16

Date issued

2006-05-16

Examiner

Tso, Edward H. (Department: 2838)

Patent Class

Electricity: battery or capacitor charging or discharging

SubClass

Battery or cell discharging

SubSubClass

With charging

Type

Reexamination Certificate

Status

active

Patent number

07045990

Description

ABSTRACT:
A portable device for preventing overcharging of a secondary battery resulting from contact failure of a voltage detection terminal. The portable device includes a charging circuit for charging the secondary battery when a battery pack, which includes the secondary battery, is connected to the portable device. The charging circuit includes a charging terminal, which is used to supply the secondary battery with charging current, and a voltage detection terminal, which is used to detect voltage of the secondary battery. The charging circuit stops charging the secondary battery when voltage abnormality is detected at the voltage detection terminal.

REFERENCES:
patent: 3784892 (1974-01-01), Zelina
patent: 5113128 (1992-05-01), Ohara et al.
patent: 5254930 (1993-10-01), Daly
patent: 11-187588 (1999-07-01), None

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