Development of highly efficient transducer for wireless power transmission system by ultrasonic

Shigeta, Yusuke; Hori, Yuki; Fujimori, Keiya; Tsuruta, Kenji; Nogi, Shigeji

doi:10.1109/imws.2011.5877115

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…Kawanabe et al (2001) and Arra et al (2007) explored plate-to-plate transmission separated by tissue. Ozeri and Shmilovitz (2010) and Shigeta et al (2011) took the analysis further by adding a quarter wavelength matching layer to the plate to reduce pressure reflections at the generator surface. Denisov and Yeatman (2010) performed a comparison between near-field inductive and acoustic power transfer concluding that near-field inductive power transfer is more efficient for larger devices with shallower tissue depths while acoustic power transfer is more efficient for smaller devices with deeper tissue depths.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonically powered piezoelectric generators for bio-implantable sensors: Plate versus diaphragm

Christensen

Roundy

2015

Journal of Intelligent Material Systems and Structures

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This article is a comparative study of the design spaces of two bio-implantable acoustically excited generator architectures: the bulk-mode piezoelectric plate (plate) and the flexure-mode unimorph piezoelectric diaphragm (diaphragm). The acoustic to electrical power transducers, or generators, are part of an acoustic, or ultrasonic, power transfer system for implantable sensors and medical devices such as glucose monitors, metabolic monitors, and drug delivery systems. Scalable network equivalent models are presented and used to predict that for sub-millimeter size devices, the diaphragm architecture generates more power than the plate architecture and is less sensitive to absorption power losses with increased implant depth. The models are compared to the experimental data from centimeter-size devices. This article will present and compare the power loss mechanisms and total power generated for each of the architectures as a function of diameter, aspect ratio, and implanted depth.

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Section: Introductionmentioning

confidence: 99%

Ultrasonically powered piezoelectric generators for bio-implantable sensors: Plate versus diaphragm

Christensen

Roundy

2015

Journal of Intelligent Material Systems and Structures

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“…For the ultrasonic WPT technique, a maximum power of 5.4 W was obtained with an efficiency of 36%, at a separation of 4cm and an operating frequency of 100 kHz [54]. The maximum efficiency of 50% was achieved at an operating frequency of 1.2 MHz [61]. As the required active area to propagate energy is small, the separation distance is therefore relatively small, and a maximum separation distance of 400 mm was found.…”

Section: Comparison and Discussion Of Inductive And Ultrasonic Wptmentioning

confidence: 97%

“…In another example, a maximum efficiency of 50% was achieved at an operating frequency of 1.2 MHz [61]. As the required active area was small, the separation distance was therefore relatively small, and a maximum separation distance of 400 mm was found.…”

Section: B Advancements In Ultrasonic Wptmentioning

confidence: 97%

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A Review on Miniaturized Ultrasonic Wireless Power Transfer to Implantable Medical Devices

et al. 2019

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Wireless power transfer has experienced a rapid growth in recent years due to the need for miniature medical devices with prolonged operation lifetime. The current implants utilize onboard batteries as their main source of power. The use of batteries is not, however, ideal because they have constrained lifetime requiring periodic replacement. Energy can be supplied to the implantable devices through wireless power transfer approaches including inductive, ultrasonic, radio frequency, and heat. The implantable devices driven by energy harvesters can operate continuously, offering ease of use and maintenance. Inductive coupling is a conventional approach for the transmission of power to implantable devices. However, the inductive coupling approach is affected by tissue absorption losses inside the human body. To power implantable devices such as neural, cochlear, and artificial heart devices, the inductive coupling approach is being used. On the other hand, ultrasonic is an emerging approach for the transmission of power to implantable devices. The enhanced efficiency and low propagation loss make ultrasonic wireless power transfer an attractive approach for use with implantable devices. This paper presents a study on the inductive and ultrasonic wireless power transfer techniques used to power implantable devices. The inductive and ultrasonic techniques are analyzed from their sizes, operating distance, power transfer efficiency, output power, and overall system efficiency standpoints. The inductive coupling approach can deliver more power with higher efficiency compared to the ultrasonic technique. On the other hand, the ultrasonic technique can transmit power to longer distances. The advantages and disadvantages of both techniques as well as the challenges to implement them are discussed. INDEX TERMS Energy harvesting, implantable devices, wireless power transfer, inductive, ultrasonic, power transmission efficiency.

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“…These more advanced models include finite difference and finite elements. These modeling techniques have also been frequently used in literature [4,[6][7][8][9][11][12][13][14] and are typically accessed via commercial software in such programs as COM-SOL and ANSYS. 2D axis-symmetric finite element models can model beam spreading and TX and RX of differing diameters.…”

Section: Introductionmentioning

confidence: 99%

A computationally efficient technique to model depth, orientation and alignment via ray tracing in acoustic power transfer systems

Christensen

Basaeri

Roundy

2017

Smart Mater. Struct.

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In acoustic power transfer systems, a receiver is displaced from a transmitter by an axial depth, a lateral offset (alignment), and a rotation angle (orientation). In systems where the receiver's position is not fixed, such as a receiver implanted in biological tissue, slight variations in depth, orientation, or alignment can cause significant variations in the received voltage and power. To address this concern, this paper presents a computationally efficient technique to model the effects of depth, orientation, and alignment via ray tracing (DOART) on received voltage and power in acoustic power transfer systems. DOART combines transducer circuit equivalent models, a modified version of Huygens principle, and ray tracing to simulate pressure wave propagation and reflection between a transmitter and a receiver in a homogeneous medium. A reflected grid method is introduced to calculate propagation distances, reflection coefficients, and initial vectors between a point on the transmitter and a point on the receiver for an arbitrary number of reflections. DOART convergence and simulation time per data point is discussed as a function of the number of reflections and elements chosen. Finally, experimental data is compared to DOART simulation data in terms of magnitude and shape of the received voltage signal.

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Development of highly efficient transducer for wireless power transmission system by ultrasonic

Cited by 14 publications

References 5 publications

Ultrasonically powered piezoelectric generators for bio-implantable sensors: Plate versus diaphragm

Ultrasonically powered piezoelectric generators for bio-implantable sensors: Plate versus diaphragm

A Review on Miniaturized Ultrasonic Wireless Power Transfer to Implantable Medical Devices

A computationally efficient technique to model depth, orientation and alignment via ray tracing in acoustic power transfer systems

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