Current sensor according to the compensation principle
US6177791A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1999 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Jul 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/185
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Current sensor according to the compensation principle, in which the magnetic field produced by a primary winding (1) through which the current to be measured flows is compensated by the compensation current in a secondary winding (6), and in which for the controlling of the compensation current at least one sensor (3) that is influenced by the magnetic field acquires deviations from the zero current and supplies this measurement value to a driver circuit (5) for the production of the compensation current, whereby at the output of the driver circuit (5) the secondary winding (6) is connected in series to a terminating resistance (7), a voltage (Ua) that is proportional to the current to be measured is present at the terminating resistance (7), two amplifiers (5a,5b) in a bridge circuit, which are controlled by the measurement value and which supply output signals in phase opposition to one another, are used as a driver circuit (5), and the series circuit of the secondary winding (6) and terminating resistance (7) is connected between the outputs of the amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.