Fluxgate-based Current Sensor

摘要

Operating a current sensor by conducting a current serially through a first region and a second region of an electrically conductive member. A first magnetic field produced by the current in the first region is sensed using a first magnetic field based current (MFBC) sensor having a first sensitivity. The sensitivity of a second MFBC is reduced. A second magnetic field produced by the current in the second region is sensed using the second MFBC sensor having a reduced sensitivity, in which the reduced sensitivity is lower than the first sensitivity. A magnitude of the current is calculated based on the first magnetic field and the second magnetic field. A dynamic range of the current sensor is extended by calculating a magnitude of the current using the second magnetic field after the first MFBC is saturated.

主权项

1. A system comprising:
a current measuring device, in which the device includes: an electrically conductive member having a first region connected in series with a second region; a first magnetic field based current (MFBC) sensor mounted adjacent to the first region such that the first MFBC sensor is operable to sense a first magnetic field formed by a current flowing through the first region; and a second MFBC sensor mounted adjacent to the second region such that the second MFBC is operable to sense only a fraction of a magnetic field formed by the current flowing through the second region.