Battery state monitoring circuit and battery apparatus

Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging

Reexamination Certificate

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C320S136000

Reexamination Certificate

active

08058845

ABSTRACT:
Provided is a battery state monitoring circuit which is capable of preventing a discharge leak current from a battery so as to eliminate a load conventionally imposed on a user, including: a battery state detector circuit that detects a state of the battery based on a voltage of the battery; a transmitting terminal that transmits battery state information indicative of the state of the battery to an outside; a receiving terminal that receives battery state information of another battery from the outside; a transistor that is used for transmitting the battery state information, and has any one of two terminals except for a control terminal connected to the transmitting terminal; and a diode that is connected in a direction opposite to a direction of a parasitic diode disposed between the two terminals of the transistor, the diode being disposed between the transmitting terminal and one terminal of the transistor.

REFERENCES:
patent: 5304915 (1994-04-01), Sanpei et al.
patent: 5789900 (1998-08-01), Hasegawa et al.
patent: 5808444 (1998-09-01), Saeki et al.
patent: 5825155 (1998-10-01), Ito et al.
patent: 5929593 (1999-07-01), Eguchi
patent: 6340880 (2002-01-01), Higashijima et al.
Patent Abstracts of Japan, publication No. 2005-117780, publication date Apr. 28, 2005.

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