REGULATED MAGNETIC FLUX DENSITY FOR EXTENDED CURRENT MEASUREMENT

摘要

A current sensor senses a primary current in a conductor. The current sensor includes a core, a sensing device, and a magnetizing coil. The core is configured so that the primary current generates a first magnetic field concentrated in the core. A magnetic flux density of the core is established based upon the first magnetic field and a magnetic permeability of the core. The sensing device senses the magnetic flux density of the core and provides a voltage representative of the primary current. The magnetizing coil receives a magnetizing current when the primary current is greater than a threshold value. The magnetizing coil generates a coil magnetic field in response to the magnetizing current to decrease the magnetic permeability of the core.

主权项

1. A current sensor for sensing a first current in a first conductor, the current sensor comprising:
a core configured so that the first current generates a first magnetic field concentrated in the core, wherein a magnetic flux density of the core is established based upon the first magnetic field and a magnetic permeability of the core; a first sensing device that senses the magnetic flux density of the core and provides a first voltage representative of the first current; and a magnetizing coil that receives a magnetizing current when the first current is greater than a threshold value, wherein the magnetizing coil generates a coil magnetic field in response to the magnetizing current to decrease the magnetic permeability of the core.