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Low-cost, microcontroller-based phase shift measurement system for a wireless power transfer prototype.

Andrés Martínez1, Christian González1, Adrián Jaramillo1

  • 1School of Electrical Engineering, Universidad Tecnológica de Panamá, Víctor Levi Sasso Campus, Panama.

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Summary
This summary is machine-generated.

This study introduces a low-cost wireless charger and phase-shift measurement system to address misalignment issues. The system uses phase shift to maintain optimal efficiency in wireless power transfer (WPT) for electric vehicles and medical devices.

Keywords:
Magnetic couplingMisalignmentPhase shiftResonance frequencyTeensy microcontrollerWireless power transfer

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Wireless Power Transfer

Background:

  • Wireless Power Transfer (WPT) systems face efficiency challenges due to coil misalignment.
  • Maintaining optimal resonance frequency is crucial for efficient power delivery in WPT applications.

Purpose of the Study:

  • To design and construct a low-cost wireless charger prototype and a novel phase-shift measurement system.
  • To characterize and mitigate the adverse effects of misalignment in WPT applications.
  • To develop a feedback control system for maintaining optimal operating conditions.

Main Methods:

  • A half-bridge inverter and series-series compensated antennas were used for the wireless charger.
  • A microcontroller (Teensy 4.1) generated high-frequency Pulse Width Modulation (PWM) signals.
  • A phase-shift measurement system utilizing high-speed operational amplifiers and an exclusive OR gate was developed.
  • Controlled vertical misalignments were introduced using a 3D-printed displacement system.

Main Results:

  • Vertical misalignments caused variations in the system's resonance frequency, leading to a proportional phase shift.
  • The measurement system successfully estimated the phase shift from high-frequency signals.
  • A proportional-integral controller utilized the phase shift to adjust the operating frequency, restoring optimal conditions.

Conclusions:

  • The developed phase-shift measurement system effectively monitors and compensates for misalignment in WPT.
  • This inexpensive and precise implementation offers potential applications in electric vehicles (EVs) and biomedical devices.
  • The system demonstrates a viable method for maintaining high efficiency in WPT despite positional variations.