Battery state of charge indicator operating on bidirectional integrations of terminal voltage
US4388618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Jan 7, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/21
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Battery terminal voltage is measured on a continuing basis during both positive and negative voltage excursions with relation to a summed reference value to obtain a measured difference. The resultant measured difference causes the generation of convergence function signals which vary dependent upon the magnitude and polarity of the measured difference and a bi-directional integrator is connected to receive the convergence function signals to integrate in either direction dependent upon the polarity of the convergence function signals. A feedback is provided from the integrator to modify the summed reference value and the output of the integrator is indicated as a measure of the state-of-charge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.