Method for detecting low battery state without precise calibration
US5268845A · kind A · utility
61Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1991 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Feb 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3842
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A portable electronic system, which can accurately predict impending battery failure, without using expensive comparators, by using voltage and current measurements to determine the source impedance of a battery. Preferably two banks of batteries are used, with a load-switching relay; the voltage and current of both banks is monitored, so that voltage drop under load can be monitored. Alternatively, the voltage variation of a single battery bank can simply be correlated to the current drawn by a changing load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.