Battery charge monitor
US6661204B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2002 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Jul 11, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0092
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a circuit to monitor exactly the charge status of a battery of a battery powered device is achieved. The charge and discharge currents are continuously measured and integrated over time to get the exact charge of the battery. Inaccuracies caused by the offset of the integrators are precisely compensated by a bridge-like design of said circuit and by a feedback of said offset to the input of the integrators. The system is clocked in a way to enable a continuous operation. Another advantage is the low current consumption of the circuit by sharing some of the components for the integration of the currents and handling of the offset. The improved accuracy is optimizing the operation of said battery driven device and is avoiding any potential damage of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.