Overcharge and overdischarge protection for a chargeable electri

Details Overcharge and overdischarge protection for a chargeable electri Overcharge and overdischarge protection for a chargeable electri

1995-06-27

1997-04-01

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 5, H02J 706

Patent

active

056170106

ABSTRACT:
A protection circuit for an electric cell comprises an overcharge detection circuit (43-1, 43-2) and an overdischarge detection circuit (44-1, 44-2) both of which are connected to a chargeable electric cell (41, 42) to detect an overcharged condition and an overdischarged condition of the electric cell (41, 42), respectively. A switch (S11, S12) is inserted in a power supply line of the chargeable electric cell (41, 42) and is turned off, when the overcharge detection circuit (43-1, 43-2) or the overdischarge detection circuit (44-1, 44-2) detects the overcharged or the overdischarged condition, thereby inhibiting a charging or a discharging operation. At least the overcharge detection circuit (43-1, 43-2) of the above-mentioned two detection circuits (43-1, 43-2, 44-1, 44-2) is connected to a timing signal producing circuit (45) for supplying a first timing signal having a first duration t1 for defining an operation timing thereof, and to a processing circuit (46) for processing an output signal of the overcharge detection circuit (43-1, 43-2) activated by the first timing signal to judge the presence or absence of an overcharged condition and for turning off the switch (S11) upon Judgement of the presence of the overcharged condition.

REFERENCES:
patent: 5206578 (1993-04-01), Nor
patent: 5519563 (1996-05-01), Higashijima
patent: 5526215 (1996-06-01), Higashijima

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