Compensation technique for amplifiers in a current sensing circuit for a battery
US9217780B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2014 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Aug 9, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one embodiment, a circuit includes a first amplifier having a first differential input, a second differential input, and an output. The replica device is configured to generate a replica current of a current flowing through the battery where the first amplifier controls the control device to control the replica current. The circuit also includes a second amplifier having a third differential input, a fourth differential input, and an output. The second amplifier is configured to compensate for a first offset error of the first amplifier and a second offset error of the second amplifier based on selectively coupling the third differential input to the output of the first amplifier during a first phase, selectively coupling the output of the second amplifier to the second differential input during the first phase, and selectively coupling the output of the second amplifier to the fourth differential input during a second phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.