A Separate Monitoring Circuit for AC and DC Mixed Magnetic Fields

Abstract

The invention provides a separating type monitoring circuit of an alternating / direct current aliasing magnetic field. The separating type monitoring circuit comprises a power supply (4), a Hall probe (1), an instrumentation amplifier (2) and an alternating / direct current signal separating module (3), wherein the power supply (4), the Hall probe (1), the instrument-used amplifier (2) and the alternating / direct current signal separating module (3) are sequentially connected. The separating type monitoring circuit is simple in structure, low in cost and capable of monitoring the environment of the alternating / direct current aliasing magnetic field and obtaining component values of a direct current magnetic field and an alternating current magnetic field, and thus the separating type monitoring of the alternating / direct current aliasing magnetic field is completed.

Description

[0001] Technical field: [0002] The invention relates to a monitoring circuit, in particular to a separate monitoring circuit for AC and DC mixed magnetic fields. [0003] Background technique: [0004] Existing magnetic field measuring instruments can only measure one type of magnetic field at a time, that is, AC magnetic field or DC magnetic field. Therefore, Hall sensors or induction coils should be used to convert magnetic signals into electrical signals before measurement, and then pass through the signal processing module to finally form the calibration of magnetic field values ​​such as maximum value, average value, root mean square value, etc. to confirm the measured Whether the magnetic field is DC or AC in nature. [0005] In some special occasions, it is not known whether the measured magnetic field is DC or AC, and sometimes even the DC magnetic field and the AC magnetic field are mixed together. For example, inside a high-power rectifier or switching power suppl...

AI Technical Summary

Problems solved by technology

[0006] According to the electromagnetic induction phenomenon, the AC magnetic field can generate induced electromotive force and induced current, and even generate electromagnetic radiation that will adversely affect the human body, equipment, and electronic communications. The existence of a DC magnetic field will cause transformers, voltage transformers, current transformers, etc. The iron core of electrical equipment or measuring instruments that rely on iron cores is biased, which affects the measurement accuracy of electric energy or the correct transmission of signals

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