Method of protecting a chargeable electric cell
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 22, 2002
Grant Date -
N/A
app pub date -
Nov 9, 2000
filing date -
Nov 11, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a secondary battery protection circuit for protecting a secondary battery (300), on discharging, a discharge switch off arrangement (211, 212, 213, 214) turns a discharge control switch (FET1) off when a battery voltage (Vcc) is lower than a predetermined overdischarge detection threshold voltage. A discharge switch on arrangement (216, 217, 218, 219) immediately turns the discharge control switch on when a charger (500) for a load (400) is connected between external connection terminals (101, 102). On charging, a charge switch off arrangement (221, 222, 223, 224) turns a charge control switch (FET2) off when the battery voltage is higher than a predetermined overcharge detection threshold voltage. A charge switch on arrangement (226A, 227B, 228A, 229) immediately turns the charge control switch on when the load for the charger is connected between the external connection terminals.
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