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Related Concept Videos

Source Transformation for AC Circuits01:11

Source Transformation for AC Circuits

765
The process of source transformation in the frequency domain entails the conversion of a voltage source, positioned in series with an impedance, into a current source that is parallel to an impedance, or the other way around. It is essential to maintain the following relationships while transitioning from one source type to another.
765

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A FPGA-based adaptive differential current source for electrical impedance tomography.

J Z Liu1, X B Li1, H Xiong1

  • 1The School of Control Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China.

The Review of Scientific Instruments
|October 2, 2021
PubMed
Summary
This summary is machine-generated.

A novel current source for electrical impedance tomography (EIT) systems offers wide bandwidth and high precision. This field-programmable gate array (FPGA)-based design ensures accurate current delivery for improved EIT imaging.

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Area of Science:

  • Electrical Engineering
  • Biomedical Engineering
  • Instrumentation

Background:

  • Electrical Impedance Tomography (EIT) systems require high output impedance current sources.
  • Existing current sources face limitations at higher frequencies and with complex loads.
  • Automatic adjustment of current amplitude and phase is crucial for EIT accuracy.

Purpose of the Study:

  • To design and validate a wide-bandwidth, high-precision current source for EIT systems.
  • To overcome limitations of conventional current sources in EIT applications.
  • To achieve automatic adjustment of output current amplitude and phase.

Main Methods:

  • Development of a field-programmable gate array (FPGA)-based current source.
  • Implementation of a double digital-to-analog converter (DAC) differential current source structure.
  • Utilization of a dynamic reference point demodulation algorithm for real-time current measurement.
  • Integration of an adaptive compensation module for output current regulation.

Main Results:

  • The current source exhibits an output resistance of 10 MΩ and output capacitance below 0.8 pF across a 10 kHz-1.28 MHz frequency range.
  • Post-compensation, current amplitude attenuation is less than 0.016%, and phase error is below 0.0025°.
  • The system demonstrates effective real-time current amplitude and phase acquisition and adjustment.

Conclusions:

  • The proposed FPGA-based current source effectively addresses EIT system requirements for wide bandwidth and high precision.
  • The double DAC structure and adaptive compensation algorithm ensure accurate and stable current delivery.
  • This advanced current source technology enhances the performance and reliability of EIT systems.