Accurate current sensing with heat transfer correction
US8920026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2011 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Feb 28, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R1/203
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one embodiment, a current sensing circuit corrects for the transient and steady state temperature measurement errors due to physical separation between a resistive sense element and a temperature sensor. The sense element has a temperature coefficient of resistance. The voltage across the sense element and a temperature signal from the temperature sensor are received by processing circuitry. The processing circuitry determines a power dissipated by the sense element, which may be instantaneous or average power, and determines an increased temperature of the sense element. The resistance of the sense element is changed by the increased temperature, and this derived resistance Rs is used to calculate the current through the sense element using the equation I=V/R or other related equation. The process is iterative to continuously improve accuracy and update the current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.