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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Numerical and Experimental Investigation of Time-Domain-Reflectometry-Based Sensors for Foreign Object Detection in

Martin Helwig1, Yun Xu1, Uwe Hentschel1

  • 1Institut für Leichtbau und Kunststofftechnik, Technische Universität Dresden, 01307 Dresden, Germany.

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Summary

This study introduces a new method for foreign object detection in wireless chargers using electric time domain reflectometry. The validated simulation model aids in designing safer inductive power transfer systems.

Keywords:
electric time domain reflectometryforeign object detectioninductive power transfermetal object detectionwireless chargingwireless power transfer

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Wireless Power Transfer

Background:

  • Foreign object detection (FOD) is crucial for wireless charging safety to prevent inductive heating.
  • Existing methods may lack precision in detecting metallic objects within the air gap.

Purpose of the Study:

  • To present a novel method for metallic foreign object detection in wireless charging systems.
  • To identify and analyze key transmission line design parameters for effective FOD.

Main Methods:

  • Utilized electric time domain reflectometry for metallic object detection.
  • Developed and validated a transient electromagnetic simulation model.
  • Conducted laboratory-scale experiments with parametrically designed sensors and a test object (EUR 2 coin).

Main Results:

  • Identified and investigated two critical transmission line parameters for FOD in inductive power transfer.
  • Validated the simulation model by comparing sensor impedance and reflection coefficients with experimental data.
  • Provided a comprehensive analysis of transmission line design parameters for FOD applications.

Conclusions:

  • The proposed electric time domain reflectometry method is effective for foreign object detection in wireless charging.
  • The validated simulation model serves as a valuable tool for designing and optimizing FOD systems.
  • Understanding transmission line parameters is key to enhancing the safety and efficiency of wireless charging.