10 April 2013 Effect of misalignment between ultrasound piezoelectric transducers on transcutaneous energy transfer
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This paper presents power transmission performance of the ultrasound-based piezoelectric recharging system for implantable medical devices. The efficiency of the piezoelectric ultrasonic transcutaneous energy transfer system depends on frequency matching of the transmitter and receiver, electrical, mechanical and acoustical impedance characteristics, distance between the transducers, and misalignment. However, it was realized that the angular misalignment between transmitter and receiver was one of key factors to have effect on the power transmission efficiency. As such, misalignment effect of the piezoelectric ultrasound transmitter and receiver on the power transmission efficiency was investigated by theoretical analysis using finite-difference time-domain method. The pressure field variation in the near field was also estimated to examine the influence of the power transfer performance of the ultrasound-based charging system. Analytical results indicate that the transferred power is greatly reduced by voltage cancellation on the receiver from phase shift due to the misalignment. Furthermore, significant acoustic pressure variation in the near field makes the effect of misalignment on power transmission dependent on the receiver location.
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Changki Mo, Changki Mo, Scott Hudson, Scott Hudson, Leon J. Radziemski, Leon J. Radziemski, "Effect of misalignment between ultrasound piezoelectric transducers on transcutaneous energy transfer", Proc. SPIE 8688, Active and Passive Smart Structures and Integrated Systems 2013, 868814 (10 April 2013); doi: 10.1117/12.2009895; https://doi.org/10.1117/12.2009895

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