Impedance automatic matching device and matching method of magnetic characteristic measurement system

Abstract

The invention discloses an impedance automatic matching device and matching method of a magnetic characteristic measurement system. The device comprises a current transformer, a voltage transformer, afirst voltage comparator, a second voltage comparator, a DSP, a plurality of MOSFET switch tube driving circuits and a capacitor box. The capacitor box comprises a plurality of first MOSFET switch tubes, a plurality of matching capacitors, an intermediate capacitor and a second MOSFET switch tube. During a measuring process, the current transformer and the voltage transformer detect voltage and current signals in real time; a square wave signal obtained by the voltage comparator is input into the DSP; the DSP controls the MOSFET switch tube driving circuits through signal calculation so as toautomatically control the matching capacitors; and real-time phase detection, automatic impedance matching and real-time compensation are realized, matching precision is improved, manual operation isavoided in a whole process, an experiment process and a control strategy are simplified, and experiment efficiency is improved.

Description

technical field [0001] The invention relates to the field of magnetic characteristic measurement, in particular to an impedance automatic matching device and a matching method of a magnetic characteristic measurement system. Background technique [0002] Accurate measurement and simulation of magnetic properties such as hysteresis and loss of magnetic materials are the key to optimizing the design of electromagnetic devices. The measurement under one-dimensional and two-dimensional conditions cannot accurately describe the spatial magnetic properties of the material, so a three-dimensional magnetic property measurement system is used. The magnetic and magnetic characteristic measurement system includes a computer, a power amplifier, a water-cooled resistor, an excitation coil, a test sample, a sensing coil and an amplifying circuit to realize the space rotation excitation and obtain the sensing signal. The computer outputs the excitation signal to the power amplifier for am...

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Problems solved by technology

The document with application number 201720388703.5 discloses an automatic resonant capacitor matcher suitable for a three-dimensional magnetic characteristic measurement system. It only uses a single-chip microcomputer to control the mechanical switch after artificially calculating the capacitance value, and does not perform phase detection to automatically control the switch.

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