Anti-interference circuit and method for three-phase three-wire electric energy meter in alternating current magnetic field

The invention discloses an anti-interference circuit and method for a three-phase three-wire electric energy meter in an alternating current magnetic field, and belongs to the technical field of electric energy metering. A current sampling loop of the electric energy meter comprises a sampling element part, a signal conversion and filter circuit part and a metering part, the sampling element part comprises an A-phase sampling element and a C-phase sampling element, and the signal conversion and filter circuit part comprises an A-phase signal conversion and filter circuit and a C-phase signal conversion and filter circuit. The signal conversion and filter circuit part further comprises a B-phase signal conversion and filter circuit, the input end of the B-phase signal conversion and filter circuit is suspended, and the output end of the B-phase signal conversion and filter circuit is connected with the B-phase input end of the metering part. Induced current generated by an alternating-current magnetic field is