Battery state of charge metering method and apparatus
US4560937A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3646
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit is provided for generating a series of voltage pulses on a single output line with each pulse corresponding in length to the binary digital value stored in the integrator to provide a time based resultant indication of the stored binary digital value. A filtering means is included to provide a substantially smooth analog output voltage having an amplitude corresponding to the summation of the pulses. The system preferably includes a delayed high voltage reset feature to set the integrator to a full charge state in response to voltage levels accompanying charging of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.