Closed-loop current transducer with switched mode amplifier
US9234918B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 2011 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Jan 3, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/202
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A closed-loop current transducer for measuring a current (Ip) flowing in a primary conductor, the transducer powered by series connected voltage supplies (V_H, V_L) and comprising a magnetic field detector, a signal processing circuit including an amplifier circuit connected to the magnetic field detector, and a compensation coil (WS1) connected to the amplifier circuit and configured to generate an opposing magnetic field seeking to cancel a magnetic field generated by the current flowing in the primary conductor. The amplifier circuit comprises a first switched mode power stage configured to drive the magnetic field generator, and a second switched mode power stage configured to balance the currents of the voltage supplies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.