CURRENT SENSOR WITH MAGNETIC TOROID DUAL FREQUENCY DETECTION SCHEME

摘要

A sensor device comprising a magnetic material having nonlinear magnetic properties within an ambient magnetic flux, having a signal conductor carrying a compound applied electric signal having two frequencies f 1 and f2 and coupled to the magnetic material to produce a resulting signal. A primary conductor carries a current coupled to the nonlinear magnetic material to change the flux and produce the resulting signal. The magnetic material may be open ended or in the shape of a toroid. In the latter case, the device further includes a primary conductor for carrying a primary current coupled to the nonlinear magnetic material to change the flux and produce the resulting signal.