Dynamic compensation of aging drift in current sense resistor
US8779777B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2011 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Mar 1, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R35/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current sense resistor circuit may include a primary current sense resistor that drifts with age. A secondary current sense resistor may drift with age in substantial unison with the primary current sense resistor. A calibration resistor may not drift with age in substantial unison with the primary current sense resistor. A compensation circuit may compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. The secondary current sense resistor may be in parallel with the primary current sense resistor, except when the compensation circuit is comparing the calibration resistor with the secondary current sense resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.