A current sensor and its multi-flux balance control circuit

Abstract

The invention discloses a current sensor and a multi-flux balancing control circuit thereof. According to the current sensor and multi-flux balancing control circuit thereof, the multi-flux balancingcontrol circuit comprising an exciting flux balancing module and an AC-DC flux balancing module is adopted in the current sensor, the exciting flux balancing module generates an exciting compensationmagnetic field according to a detected interfering magnetic field, magnetic flux of a magnetic field, formed by superimposing the exciting compensation magnetic field and the interfering magnetic field, passing through a plane perpendicular to its magnetic induction lines is zero; the AC-DC flux balancing module generates an AC-DC compensating magnetic field according to a detected A flux signal and a DC magnetic bias signal output by means of an excitation module, and magnetic flux of a magnetic field, formed by superimposing the AC-DC compensating magnetic field, a DC magnetic bias magneticfield and an AC magnetic field, passing through a plane perpendicular to its magnetic induction lines is zero, thereby eliminating the magnetic field interference generated by the excitation module, realizing precise detection of the alternating current and the direct current, improving the current detection precision of the sensor, and reducing the production cost of the sensor.

Description

technical field [0001] The invention relates to the field of current detection, in particular to a current sensor and a multi-magnetic flux balance control circuit thereof. Background technique [0002] A current sensor is a sensor that can sense the current to be measured, convert large current or micro current into small current and voltage signals that are easy to measure, and isolate and output analog or digital signals. [0003] Existing magnetically modulated current sensors generally include an excitation module and a DC flux balance module. The excitation module is used to generate the target excitation magnetic field to detect the DC bias magnetic field generated by the current to be measured passing through the current sensor, and output a DC bias signal corresponding to the DC bias magnetic field; the DC magnetic flux balance module according to the DC bias The magnetic signal generates a DC bias compensation magnetic field, and compensates the DC bias magnetic f...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a current sensor and its multi-flux balance control circuit, which aims to solve the problem of low current detection accuracy, complex structure, high cost and inability to realize wide-band current detection in existing current sensors. The problem

Images