Lithium-ion and lithium polymer battery recharging
US6242893A · kind A · utility
14Cited by
11References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Jun 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0029
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A safety circuit for lithium-ion and lithium polymer cells which provides for greater accuracy in control of the limiting voltages and currents during discharging and recharging and which includes recognition circuitry to determine presence of a particular battery type. MOSFETS, normally used to provide charge limiting voltages, in recharging cells or batteries but which are relatively imprecise, are removed from the circuit to the extent that they are not used in the measurement of current for control purposes. The function of current limit determinations is instead provided by highly accurate resistive elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.