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Broadband constant-amplitude AC square-wave current control method and device for inductive loads

An AC square wave, inductive load technology, used in measurement devices, irreversible DC power input conversion to AC power output, electrical/magnetic exploration, etc.

Active Publication Date: 2011-12-28
CHONGQING CUILU DETECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Broadband constant-amplitude AC square-wave current control method and device for inductive loads
  • Broadband constant-amplitude AC square-wave current control method and device for inductive loads
  • Broadband constant-amplitude AC square-wave current control method and device for inductive loads

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Embodiment Construction

[0105] Concrete control method of the present invention is:

[0106] 1. Close the switch S, adjust the AC square wave current control circuit 2, so that the frequency of the output AC square wave current is 10kHz;

[0107] 2. Adjust the voltage V of the DC power supply 1 =12v, the amplitude of the output AC square wave current is I=12A, and the maximum current that the selected fully-controlled electronic switch can withstand is 31A;

[0108] 3. Output periodic load voltage waveform v o (t) is:

[0109] t 0 :v o (t)=V C , the figure is V o =800V;

[0110] t 1 :v o (t) from 800V to V 1 ;

[0111] t 2 :v o (t) by V 1 rise to -800V;

[0112] t 3 :v o (t) = -800V;

[0113] t 4 :v o (t) drop from -800V to -V 1 ;

[0114] t 5 :v o (t) by -V 1 rise to 800V;

[0115] t 6 :v o (t) = 800V;

[0116] The control voltage and AC square wave current during the rise and fall of positive AC square wave current:

[0117] at t 0 ~t 1 During the period, the first s...

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Abstract

A wide-frequency constant-amplitude AC square-wave current control method and device for inductive loads are especially suitable for generating AC square-wave currents from electromagnetic sending coils in frequency-domain electromagnetic methods, and are suitable for geophysical exploration and nondestructive testing fields. The method of the present invention includes: adjusting the output current frequency, the reference voltage and the voltage of the clamping voltage source (4), so as to produce a periodic load current waveform with the same shape and constant amplitude, calculate the commutation slope of the alternating current square wave, and convert to time and magnitude of current. The device of the present invention comprises a DC power supply, an AC square wave current generator (2), an AC square wave current control circuit, an inductive load, an energy supplement circuit (1), a hysteresis control circuit (5), a clamping circuit (3) and Clamp the voltage source (4). The invention improves the steepness of the commutation edge of the AC square wave current, realizes the linearity of the commutation edge, and solves the problems of raising and constant current amplitude, expanding the frequency range, and the like.

Description

Technical field: [0001] The invention relates to a wide-frequency constant-amplitude AC square-wave current control method and device for an inductive load, which is used for generating an AC square-wave current by an electromagnetic sending coil in a frequency-domain electromagnetic method, and is suitable for the fields of geophysical exploration and nondestructive testing. 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 the 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. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48G01V3/10G01N27/00
Inventor 付志红赵俊丽苏向丰谢品芳
Owner CHONGQING CUILU DETECTION TECH CO LTD
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