Magnetic property measurement system and method for magnetic material

Abstract

The invention provides a magnetic property measurement system and method for a magnetic material. The measurement system comprises a digital signal generator, a full bridge inverter circuit, a filtercircuit, a magnetic material monolithic tester and a data acquisition device. Four absorption capacitors of the filter circuit are connected in parallel with four switch tubes of the full bridge inverter circuit to realize coupling with the full bridge inverter circuit, so as to filter out overshoot and oscillation generated in the switching process of the switch tubes, effectively inhibit the interference of a peripheral circuit, and improve the measurement accuracy of the magnetic field intensity in the magnetic property measurement process of the magnetic material.

Description

technical field [0001] The invention relates to the technical field of electromagnetic measurement, in particular to a system and method for measuring magnetic properties of magnetic materials. Background technique [0002] As an effective method for measuring the magnetic properties of magnetic materials, single-chip tester method (SST) is usually used in conjunction with linear power supplies such as power amplifiers to explore the magnetic properties of magnetic materials under different excitation forms. This is different from the actual working conditions in which magnetic materials are used as key components of high-frequency transformers for high-voltage direct current transmission. The power electronic full-bridge inverter circuit widely used in high-voltage DC transmission is actually a switching power supply. Due to the existence of parasitic inductance in the power loop of these circuits, it will inevitably lead to overshoot and oscillation when switching. On the...

AI Technical Summary

Problems solved by technology

The power electronic full-bridge inverter circuit widely used in high-voltage DC transmission is actually a switching power supply. Due to the existence of parasitic inductance in the power loop of these circuits, it will lead to unavoidable overshoot and oscillation when switching

On the other hand, it is impossible for any filter circuit to achieve a completely ideal effect. As far as the H-coil method is concerned, the slight disturbance generated during the waveform switching process may be amplified and delayed in the conversion of electric-magnetic-electrical signals. Therefore, it is necessary to seek a more accurate method for determining the magnetic field strength

The magnetic circuit method is a method to solve the magnetic field strength developed based on the Ampere loop law. The key lies in the determination of the magnetic circuit length. The IEC standard provides the magnetic circuit length of the Epstein square circle, but for nanocrystals, etc. The standards for new magnetic materials have not yet been formulated, and the relationship between the effective magnetic circuit length and the sample length in a closed magnetic circuit cannot be visually determined, which affects the accurate solution of the magnetic field strength obtained by the magnetic circuit method

Images