Overcharge and overdischarge protection for a chargeable electric cell operable with a reduced current consumption
US5617010A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Jun 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00306
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.