Magnetic field sensor for measuring a direct current
US12282046B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2022 |
| Grant date | Apr 22, 2025 |
| Priority date | — |
| Expiry date | Dec 13, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0092
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field sensor for measuring a direct current includes a transducer formed of coils with superparamagnetic core in series; an excitation module generating an excitation current at an excitation frequency, via a midpoint coil, an excitation voltage generator and an excitation impedance. An analysis module includes an analysis impedance coupled to the midpoint coil, and an analyzer that analyzes the current passing through the analysis impedance to extract a component at an analysis frequency equal to an even multiple of the excitation frequency. The excitation impedance forms with the superparamagnetic coils a first series RLC circuit with a resonance frequency, which is substantially equal to the excitation frequency, and a second series RLC-type circuit with an analysis resonance frequency, which is substantially equal to the analysis frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.