Voltage cutoff compensation method for a battery in a charger
US5684387A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Aug 15, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery charging system (300) is capable of maintaining a fully charged battery (304) without overcharging or undercharging the battery regardless of the chemistry type, number of cells, state of charge, or rated charge current. A charging technique (200) allows a charger (306) to sense a capacity indicator of the battery, through a capacity resistor (Rc) or memory (302) located in the battery (304), and translate data pertaining to the number of battery cells, the battery chemistry, and the rated charge current into a relative impedance (210), a cutoff adjustment voltage (212), and a stead state cutoff voltage (214). An adjusted steady state cutoff voltage is determined (216) and used as a threshold with which to compare the battery voltage (220).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.