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Addressing a Special Case of Zero-Crossing Range Adjustment Detection in a Passive Autoranging Circuit for the FBG/PZT Photonic Current Transducer

  • 0Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow G1 1XQ, UK.
Sensors (basel, Switzerland) +

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October 29, 2025

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October 29, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

This study introduces a new algorithm to improve autoranging in photonic current transducers. The hybrid algorithm enhances MOSFET switching detection near current zero-crossings for accurate measurements.

Area Of Science

  • Electrical Engineering
  • Optical Sensing
  • Power Systems

Background

  • Photonic current transducers (PCTs) utilize fiber Bragg grating/piezoelectric transducer (FBG/PZT) and current transformers (CTs) for dual metering and protection.
  • Passive autoranging (AR) extends the measurement range by shorting burden resistors using MOSFET switches.
  • Existing voltage derivative (dV/dt) algorithms struggle with MOSFET switching detection near current zero-crossings.

Purpose Of The Study

  • To develop a robust MOSFET switching detection algorithm for passive AR in PCTs, specifically addressing zero-crossing challenges.
  • To improve the accuracy of range selection in FBG/PZT transducers during dynamic current changes.

Main Methods

  • A novel hybrid algorithm is proposed, incorporating temporal slope differencing around the zero-crossing point.
  • The algorithm computes the difference in dV/dt within focused temporal windows (3 ms before and after zero-crossing).
  • Simulations and experimental validation were conducted for zero-crossing switching scenarios.

Main Results

  • The proposed hybrid algorithm reliably detects subtle MOSFET switching events near zero crossings.
  • Accurate reconstruction of burden current is achieved, overcoming limitations of previous dV/dt methods.
  • The algorithm demonstrates improved performance without necessitating additional hardware.

Conclusions

  • The enhanced hybrid algorithm significantly improves MOSFET switching detection in passive AR PCTs.
  • This method ensures reliable range selection and accurate waveform reconstruction, even under challenging zero-crossing conditions.
  • The solution offers a hardware-independent enhancement for photonic current transducer technology.

Keywords:

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