Title:Simulating Ultrasound Piezoelectric Power Transfer in the Near Field and
Experimental Validations
Volume: 5
Issue: 2
Author(s): Ammar Mohammed*, Changki Mo, John Miller, David Lowry and Jassim Alhamid
Affiliation:
- School of Mechanical and Materials Engineering, Washington State University Tri-Cities, 2710 Crimson Way, Richland,
Washington 99354, USA
Keywords:
Power transfer efficiency, piezoelectric, implanted medical devices, ultrasonic, optimize, lead zirconate titanate (PZT).
Abstract: Background: Acoustic power transfer is a method for wireless energy transfer to implanted
medical devices that permits a greater range of separation between transmitter and receiver
than is possible with inductive power transfer. In some cases, short-distance ultrasonic power
transfer may be employed; consequently, their operation may be complicated by the near-field aspects
of piezoelectric acoustic energy transfer.
Methods: A piezoelectric energy transfer system consisting of two lead zirconate titanate (PZT)
transducers was analyzed in this work using a combination of experimental measurements and
computer simulations.
Results: Simulations using the COMSOL Software package showed good agreement with measured
output voltage as a function of the distance between and alignment of the transmitter and receiver
with water as a medium. We also simulated how operating frequency affects power transfer
efficiency at various distances between the transmitter and receiver and found reasonable agreement
with experiments. We report model predictions for power transfer efficiency as a function of
the thickness and diameter of the transmitter and receiver.
Conclusion: The results show that with proper choice of parameters, piezoelectric systems can
provide high power transfer efficiency in the near-field region.
