Device for detecting residual capacity of battery
US4849700A · kind A · utility
215Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Mar 15, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/389
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting the residual capacity of a battery comprises a battery current measuring circuit for measuring battery current, a battery voltage measuring circuit for measuring battery voltage, a converting circuit for converting the measured current into a voltage value, based on the internal impedance of the battery, and a comparator circuit for comparing the conversion voltage value with the measured voltage. When the measured voltage is smaller than the conversion voltage value, the comparator circuit operates a battery residual-capacity detect signal indicating that the residual capacity of the battery is small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.