Active current measurement circuit and measurement device
US9423430B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Nov 12, 2014 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Nov 12, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0084
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The current sensing circuit includes a first input terminal and a second input terminal for introducing a subject current that flows in a current path; a shunt resistor coupled in the current path for converting the subject current into an output voltage difference across the shunt resistor; an amplifier having a first input node coupled to the first input terminal, a second input node coupled to the second input terminal, an output node, and a feedback path including an over-current protection device, wherein the feedback path is coupled between the output node and the first input terminal; and an output terminal coupled to the second input terminal and the shunt resistor to output the output voltage difference. The current sensing circuit has a relatively large current measuring range and a small burden voltage. A measurement device is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.