US 9,520,712 B2 · Method and system for controlling the turn-on time of a device that includes a magnetic circuit

Abstract

A method and a system for controlling the switching time of a device that includes a magnetic circuit and a conductive winding. The method includes acquiring a measurement of the magnetic field generated by the residual flux, by a sensor placed near the magnetic circuit; processing the acquired measurements to infer the residual flux in the magnetic circuit; determining, on the basis of the residual flux, the optimal time for switching on the device. The method also includes switching on a three-phase transformer. The transformer includes a primary conductive winding and a secondary conductive winding surrounded by an enclosure. A magnetic field sensor is on the magnetic circuit and/or on one outer surface of the enclosure.

Claims8

Dependent claims

A method for controlling a switching time of a device including a magnetic circuit and at least one conductive winding, comprising the steps of:

acquiring at least one measurement of a magnetic field generated by a residual flux in the said magnetic circuit using at least one magnetic field sensor placed in the vicinity of the magnetic circuit;
processing the acquired magnetic field measurements to infer therefrom the residual flux in the magnetic circuit,
from the residual flux, determining the optimal switching time for energizing the device;
all said steps being performed after de-energizing the device,
the method further comprising a prior calibration step of the sensor wherein a transfer function between the value of the magnetic field measured by the sensor and the value of the residual flux in the magnetic circuit is determined.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/117,840Filed 15 May 2012

Priority

FR 11 5421216 May 2011

Published

US 2014/0097704 A110 Apr 2014

Granted

13 Dec 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02H 9/005
Emergency protective circuit arrangements for limiting excess current or voltage without disconnection: avoiding undesired transient conditions
G01R 33/0023
Arrangements or instruments for measuring magnetic variables: electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the…
G01R 33/02
Arrangements or instruments for measuring magnetic variables: measuring direction or magnitude of magnetic fields or magnetic flux
G01R 33/04
Measuring direction or magnitude of magnetic fields or magnetic flux: using the flux-gate principle

Method and system for controlling the turn-on time of a device that includes a magnetic circuit

Life of this patent

Method and system for controlling the turn-on time of a device that includes a magnetic circuit

Life of this patent

Abstract

Claims8