Method of protecting a chargeable electric cell
US6340880B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2000 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Nov 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00306
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.