Device for determining the charge condition for a secondary electric storage battery
US4153867A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1977 |
| Grant date | May 8, 1979 |
| Priority date | — |
| Expiry date | Nov 14, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00714
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for determining the charge condition of a secondary electric storage battery, and including a digital integrator comprising a pulse generator for producing pulses at a frequency proportional to the magnitude of the instantaneous battery current, and an up-down counter for counting the pulses in a sense (i.e. up or down) dependent upon the battery current direction. A switching arrangement operates to couple selectively the pulse generator or an adjustment pulse generator to the counter, and a comparator controls the supply of pulses to, and the sense of counting in the counter, when the adjustment pulse generator is coupled thereto in accordance with the result of a comparison of the counter setting and of a function signal. A function generator, programmable in accord with the relationship between temperature, no-load voltage, and charge condition of the battery concerned, is controllable in accord with the instantaneous temperature and no load voltage of the battery so as to generate the function signal to represent the associated charge condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.