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Constant-current control method of multi-function electromagnetic transmitter.

Kaichang Xue1, Fengdao Zhou1, Shuang Wang1

  • 1College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130021, China.

The Review of Scientific Instruments
|March 2, 2015
PubMed
Summary
This summary is machine-generated.

A new constant-current control method enhances geophysical surveys like audio-frequency magnetotellurics. This method ensures precise current waveforms, improving data accuracy in DC resistivity and induced polarization explorations.

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Area of Science:

  • Geophysics
  • Electrical Engineering

Background:

  • Controlled source geophysical methods require stable current transmitters.
  • Current waveform distortion negatively impacts data quality in DC resistivity and induced polarization surveys.

Purpose of the Study:

  • To propose and validate a constant-current control method for geophysical prospecting.
  • To analyze and mitigate current waveform distortion in high-power transmitters.

Main Methods:

  • A cascaded topology was used to design a 40 kW constant-current transmitter.
  • Pulse width modulation (PWM) controller design based on power circuit modeling.
  • Analysis of ripple current effects and open-loop transfer function for parameter determination.

Main Results:

  • The proposed method achieved a control error below 4%.
  • Effective suppression of load variations caused by earth capacitance was demonstrated.
  • The system's responsive speed and stability were confirmed through analysis and experiments.

Conclusions:

  • The developed constant-current control method is effective for geophysical applications.
  • The PWM controller design ensures system stability and responsiveness.
  • Accurate current waveform control is crucial for reliable geophysical data acquisition.