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A Comprehensive Study on Magnetoelectric Transducers for Wireless Power Transfer Using Low-Frequency Magnetic Fields
IEEE Transactions on Biomedical Circuits and Systems
|October 8, 2021
Summary
Magnetoelectric (ME) transducers offer superior wireless power transfer (WPT) for miniaturized devices. Fabricated ME transducers demonstrated over 10-fold higher received power compared to optimized coils.
Area of Science:
- Materials Science
- Electrical Engineering
- Biomedical Engineering
Background:
- Magnetoelectric (ME) transducers, combining magnetostrictive and piezoelectric materials, efficiently convert magnetic fields to electric fields.
- They are suitable for miniaturized applications like biomedical implants and wireless power transfer (WPT).
- A comprehensive study on ME transducers as WPT receivers is lacking.
Purpose of the Study:
- To investigate the impact of ME transducer design parameters on WPT link performance.
- To develop an accurate analytical model for ME transducers operating in the longitudinal-transverse mode.
- To compare the performance of ME transducers with optimized coils for WPT.
Main Methods:
- Fabrication of nine ME transducers with varying sizes (5-150 mm³).
- Utilized Galfenol as the magnetostrictive layer and PZT-5A as the piezoelectric layer.
- Developed an analytical model and conducted measurements to analyze ME transducer performance.
Main Results:
- Determined the effects of transducer dimensions, DC bias magnetic field, load resistance (RL), and frequency on resonance frequency, quality factor, and received power (PL).
- A 150 mm³ ME transducer achieved >10-fold higher PL over a wide RL range (500 Ω to 1 MΩ) at 95.5 kHz.
- ME transducers outperformed optimized coils of comparable size and operating frequency.
Conclusions:
- ME transducers are highly effective power receivers for low-frequency WPT systems.
- Design parameters significantly influence ME transducer performance in WPT applications.
- ME transducers present a promising alternative to inductive coils for efficient WPT, especially in miniaturized and biomedical contexts.
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