Control method and device for inductive load wide-frequency amplitude-constant AC square wave current

Abstract

A control method for sensitive load broadband constant amplitude alternating rectangular wave current is especially for alternating rectangular wave current generated by electromagnetic transmitting loop in frequency domain electromagnetic method which is applied to the geophysical prospecting and the nondestructive examination field. The method of the invention, comprising: regulating the voltage of an output current frequency, a voltage reference and an embedding voltage source to generate cyclic load current waveform with same shape and constant amplitude value, to calculate a reversing slope of the rectangular wave current, reversing time and amplitude value of the current. The device of the invention comprises a DC power supply, an alternating current rectangular wave current generator, an alternating current rectangular wave current control circuit, a sensitive load, an energy supplementing circuit, a hysteresis loop control circuit, an embedding circuit and an embedding voltage source. The invention improves gradient of reversing side of the alternating rectangular wave current, accomplishes reversing side linearity, and solves problems of improvement and invariableness of current amplitude value and expansion of frequency range and so on.

Description

Technical field: [0001] The invention relates to a wide-frequency constant-amplitude AC square-wave current control method and device for inductive loads, which are used for generating AC square-wave currents by electromagnetic sending coils in frequency-domain electromagnetic methods, and are suitable for geophysical exploration and nondestructive testing fields. Background technique: [0002] In some research and industrial applications, positive square wave current, negative square wave current or AC square wave current are required. The standard waveform of AC square wave current is characterized by constant amplitude during the output current period, periodic changes in the current waveform, symmetrical positive and negative waveforms, and no transition time when the current polarity reverses. [0003] The device for generating square wave current can generate positive, negative or bipolar square wave current with adjustable pulse period and amplitude. The circuit that...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a wide-frequency constant-amplitude AC square wave current control method and device for inductive loads, which improves the steepness of the commutation edge of the AC square wave current, realizes the linearity of the commutation edge, and solves the problem of increasing the current amplitude. and constancy, frequency range extension and other issues

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