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High-Frequency Current Transformers Cascade for Power Electronics Measurements.

Maciej Chojowski1, Marcin Baszyński1, Robert Sosnowski1

  • 1Department of Power Electronics and Energy Control Systems, AGH University of Science and Technology, 30059 Krakow, Poland.

Sensors (Basel, Switzerland)
|August 12, 2022
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel cascade connection of two high-frequency current transformers (HFCT) to overcome size and weight limitations. This innovative sensor design effectively measures fast transient currents in power electronics applications.

Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Measurement Science

Background:

  • High-frequency current transformers (HFCT) are essential for measuring fast transient currents in power electronics.
  • Existing HFCTs suffer from significant dimensions and weight, limiting their practical application.
  • Bandwidth limitations in conventional HFCTs restrict their utility in certain high-frequency scenarios.

Purpose of the Study:

  • To propose and investigate a novel system for high-frequency current measurement using a cascade connection of two transformers.
  • To reduce the substantial dimensions and large weight disadvantages associated with traditional HFCTs.
  • To analyze the theoretical properties and experimental performance of the proposed cascaded HFCT sensor.

Main Methods:

Keywords:
bandwidth analysiscurrent transformerhigh frequency current measurement

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  • Derivation of the transmittance expression for a double current transformer configuration.
  • Theoretical analysis and determination of the frequency response of the cascaded sensor.
  • Experimental verification through the construction and testing of a practical cascaded current transformer setup.

    • Main Results:

    • The proposed cascade connection of two transformers effectively addresses the size and weight limitations of individual HFCTs.
    • The derived theoretical model accurately predicts the sensor's performance, validated by experimental frequency response measurements.
    • Static and dynamic tests confirm the sensor's capability to measure fast-changing signals during transients.

    Conclusions:

    • The cascaded HFCT system offers a promising solution for measuring fast transient currents with reduced physical footprint.
    • This innovative approach enhances the practicality and applicability of HFCTs in various power electronics measurement scenarios.
    • The study provides a solid theoretical foundation and experimental validation for the developed wide-bandwidth sensor.