Battery charger detecting full charge of batteries using a thermostat and thermistor in a battery pack
US5909101A · kind A · utility
50Cited by
15References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Mar 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery charging system is disclosed for charging two different types of battery packs, a known three terminal type including batteries and a thermostat switch, and a newer four terminal type further including a thermistor for sensing battery temperature. A charging control circuit stops charging current to the battery pack when a contact of the thermostat switch is open or when the thermistor detects a temperature above a predetermined temperature. If either the thermostat switch or the thermistor fail to properly operate, charging current to the battery pack is stopped securely to avoid damaging batteries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.