Current sensing circuit
US9531181B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2014 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Nov 12, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45475
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current sensing circuit comprises a first input terminal and a second input terminal for introducing a subject current from a device coupled between the first and second input terminals; a first amplifier having a first input node coupled to the first input terminal via a protection resistor, a second input node coupled to the second input terminal, and a first output node coupled to the first input node via a capacitor, wherein the first amplifier has a current sensing path for sensing the subject current and converting the subject current into an output voltage that changes with the subject current; and a protection circuit coupled between the first and second input nodes of the first amplifier, wherein the protection circuit is configured to draw a protection current from the first input terminal through the protection resistor to at least partially offset the subject current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.