Current monitoring device and current monitoring method based on current monitoring device

A current monitoring method based on a current monitoring device, the current monitoring device comprising:

• a magnetic ring, which is composed of a magnetic medium and has an air gap, wherein the magnetic ring is used for sleeving on a wire to be measured;
• a current sensor located in the air gap, a sensitive axis of the current sensor is parallel to a tangent direction corresponding to the center point projected by the current sensor on the magnetic ring, the current sensor comprising a magnetic induction circuit having a magnetoresistance sensor, the magnetic induction circuit being used for outputting a first voltage signal which changes with a resistance value of the magnetoresistance sensor;
• a post-processing circuit, which is electrically connected to the current sensor, wherein the post-processing circuit is used for analyzing and obtaining current of the wire to be measured according to the first voltage signal;
• the current monitoring method comprising:
• powering on a current sensor in a case that a magnetic ring is sleeved on a wire to be measured;
• acquiring a first voltage signal output by the current sensor;
• calculating a resistance value of a magnetoresistance sensor according to a voltage of the first voltage signal;
• querying corresponding magnetic field strength according to the resistance value of the magnetoresistance sensor, so as to obtain magnetic field strength generated at the current sensor by the wire to be measured;
• calculating and obtaining current of the wire to be measured according to the magnetic field strength and a position parameter, wherein the position parameter is a parameter characterizing the relative position between the current sensor and the wire to be measured;
• the current monitoring device further comprises:
• a voltage sensor, comprising two probes and a signal processing module, wherein the two probes are respectively arranged in contact with the wire to be measured and a null wire;
• the signal processing module is electrically connected to the two probes respectively to form a measurement loop;
• and the post-processing circuit is used for inputting a reference signal into the signal processing module, and obtaining voltage of the wire to be measured through analyzing a second voltage signal detected by the signal processing module.