Piezoceramic Electrodynamic Wireless Power Receiver Using Torsion Mode Meandering Suspension

Halim, Miah A.; Samman, J.; Smith, Spencer E.; Arnold, David P.

doi:10.1109/powermems49317.2019.20515809768

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Experimental results show good agreement with the model predictions, however, deviations are observed at higher field amplitudes (starting from 45 µT rms ) due to nonlinearities. As compared to a much larger previously reported prototype [24], this volume-efficient, chip-sized receiver prototype is 31× smaller (0.08 cm 3 vs. 2.5 cm 3 ); offers 1.7× higher Q-factor (60 vs. 35), 3.2× larger power density (4.2 mW cm −3 vs. 1.3 mW cm −3 ), and 1.4× higher normalized power density (10.6 mW cm −3 mT −2 vs. 8.2 mW cm −3 mT −2 ) when operating at the same distance (10 cm) from the transmitter coil.…”

Section: Discussionmentioning

confidence: 77%

“…Consequently, piezoelectric transduction in the vibrating receiver element has also been explored. An EWPT piezoelectric receiver using a torsionally resonated meandering structure was experimentally demonstrated [24]. Model validation and analytical investigation of a piezoelectric cantilever based EWPT receivers was reported in [25], a more recent version of which utilizes a center-clamped bimorph piezoelectric cantilever beam with magnets attached at the two ends [26].…”

Section: Introductionmentioning

confidence: 99%

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A chip-sized piezoelectric receiver for low-frequency, near-field wireless power transfer: design, modeling and experimental validation

Halim¹,

Rendon-Hernandez²,

Smith³

et al. 2021

Smart Mater. Struct.

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This work presents the design, modeling and characterization of a chip-sized piezoelectric receiver for low-frequency, near-field wireless power transmission. Utilizing a laser micro-machined titanium suspension, one NdFeB magnet, and two PZT-5A piezo-ceramic patches, the receiver operates at its torsion mode mechanical resonance. Two unimorph piezo-ceramic transducers are designed to maximize the power density of the receiver while maintaining a low mechanical resonant frequency for low-frequency electrodynamic wireless power transmission. An equivalent lumped-element circuit model is used to model the system performance. A prototype device is fabricated, assembled and tested, and the experimental results are compared with the system model. The 0.08 cm3 device generates a maximum of 360 μW average power at 1 cm distance from a transmitter coil operating at 724 Hz and below human head and torso exposure limits. This data corresponds to 4.2 mW cm−3 power density. Overall, this volume-efficient design offers a low-profile and compact footprint for potentially wirelessly charging wearable and bio-implantable devices.

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Section: Discussionmentioning

confidence: 77%