scholarly journals Enhanced Power Output in Polymer Thermoelectric Devices through Thermal and Electrical Impedance Matching

2019 ◽  
Vol 2 (10) ◽  
pp. 6973-6978 ◽  
Author(s):  
Masakazu Mukaida ◽  
Kazuhiro Kirihara ◽  
Qingshuo Wei
Keyword(s):  
Power Output ◽  
Electrical Impedance ◽  
Impedance Matching ◽  
Thermoelectric Devices ◽  
Polymer Thermoelectric

Electrical Impedance Matching of PZT NanoGenerators

2017 ◽  
Author(s):  
Richard Galos ◽  
Yong Shi ◽  
Zhongjing Ren ◽  
Hao Sun
Keyword(s):  
Power Output ◽  
Electrical Impedance ◽  
Impedance Matching ◽  
Low Frequency ◽  
Load Impedance ◽  
Impedance Measurements ◽  
Conductive Afm ◽  
Nanofiber Diameter ◽  
Internal Impedance ◽  
Self Powered

PZT nanofibers are piezoelectric and can produce a relatively high electrical output under strain that is useful for self-powered nanogenerators. To obtain maximum power output from these devices, their internal impedance needs to be matched with their applicable load impedance. Electrical impedance measurements of PZT nanofibers were performed using a variety of methods over a frequency spectrum ranging from DC to 3.0 GHz. These methods include Conductive AFM and Scanning Microwave Impedance Microscopy. Nanofibers formed by electro-spinning with diameters ranging from 3 to 150 nm were collected and measured. The nanofiber impedance was extremely high at low frequency, decreased considerably at higher frequency and varied with nanofiber diameter as well. The results are applicable for the analysis of many types of nanogenerators and nanosensors including those produced at Stevens.

scholarly journals Non-Linear Thermoelectric Devices with Surface-Disordered Nanowires

Applied Nano ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 162-183
Author(s):  
Peter Markoš ◽  
Khandker Muttalib
Keyword(s):  
Thermodynamic Parameters ◽  
Power Output ◽  
Heat Current ◽  
Linear Regime ◽  
Thermoelectric Devices ◽  
Charge Current ◽  
Thermal Current ◽  
Surface Disorder ◽  
Non Linear

We reviewed some recent ideas to improve the efficiency and power output of thermoelectric nano-devices. We focused on two essentially independent aspects: (i) increasing the charge current by taking advantage of an interplay between the material and the thermodynamic parameters, which is only available in the non-linear regime; and (ii) decreasing the heat current by using nanowires with surface disorder, which helps excite localized phonons at random positions that can strongly scatter the propagating phonons carrying the thermal current.

scholarly journals Design of a Broadband Electrical Impedance Matching Network for Piezoelectric Ultrasound Transducers Based on a Genetic Algorithm

Sensors ◽  
2014 ◽  
Vol 14 (4) ◽  
pp. 6828-6843 ◽  
Author(s):  
Jianfei An ◽  
Kezhu Song ◽  
Shuangxi Zhang ◽  
Junfeng Yang ◽  
Ping Cao
Keyword(s):  
Genetic Algorithm ◽  
Electrical Impedance ◽  
Impedance Matching ◽  
Ultrasound Transducers ◽  
Matching Network

Polymer thermoelectric modules screen-printed on paper

RSC Advances ◽  
2014 ◽  
Vol 4 (54) ◽  
pp. 28802-28806 ◽  
Author(s):  
Qingshuo Wei ◽  
Masakazu Mukaida ◽  
Kazuhiro Kirihara ◽  
Yasuhisa Naitoh ◽  
Takao Ishida
Keyword(s):  
Light Emitting Diodes ◽  
Thermoelectric Devices ◽  
Thermoelectric Modules ◽  
Light Emitting ◽  
Sufficient Power ◽  
Polymer Thermoelectric ◽  
Screen Printed

Screen-printed polymer thermoelectric devices provided sufficient power to illuminate light-emitting diodes.

scholarly journals Estimation of Acoustic Power Output from Electrical Impedance Measurements

Acoustics ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 37-50
Author(s):  
Gergely Csány ◽  
Michael Gray ◽  
Miklós Gyöngy
Keyword(s):  
Power Output ◽  
High Intensity ◽  
Electrical Impedance ◽  
Focused Ultrasound ◽  
Low Cost ◽  
Acoustic Power ◽  
High Intensity Focused Ultrasound ◽  
Ultrasound Transducers ◽  
Impedance Measurements ◽  
Primary Advantage

A method is proposed for estimating the acoustic power output of ultrasound transducers using a two-port model with electrical impedance measurements made in three different propagation media. When evaluated for two high-intensity focused ultrasound transducers at centre frequencies between 0.50 and 3.19 MHz, the resulting power estimates exceeded acoustic estimates by 4.5–21.8%. The method was shown to be valid for drive levels producing up to 20 MPa in water and should therefore be appropriate for many HIFU (high-intensity focused ultrasound) applications, with the primary advantage of employing relatively low-cost, non-specialist materials and instrumentation.

Polymer thermoelectric devices prepared by thermal lamination

2017 ◽  
Vol 225 ◽  
pp. 64-69 ◽  
Author(s):  
Masakazu Mukaida ◽  
Qingshuo Wei ◽  
Takao Ishida
Keyword(s):  
Thermoelectric Devices ◽  
Polymer Thermoelectric

Complex Impedance Matching for Power Improvement of a Circular Piezoelectric Energy Harvester

2011 ◽  
Vol 148-149 ◽  
pp. 169-172 ◽  
Author(s):  
Hong Yan Wang ◽  
Xiao Biao Shan ◽  
Tao Xie
Keyword(s):  
Output Power ◽  
Power Output ◽  
Energy Harvester ◽  
Impedance Matching ◽  
Maximum Output Power ◽  
Complex Impedance ◽  
Complex Conjugate ◽  
Maximum Output ◽  
Piezoelectric Energy ◽  
Matching Load

The impedance matching and the optimization of power from a circular piezoelectric energy harvester with a central-attached mass are studied. A finite element model is constructed to analyze the electrical equivalent impedance of the circular piezoelectric energy harvester. Furthermore, the complex conjugate matching load is used to extract the maximum output power of the energy harvester. The power output from complex conjugate matching load is compared with the power output from the resistive matching load and a constant resistance, separately. The results suggest that the complex conjugate matching can result in a significant increase of the output power for all frequencies. The effective bandwidth of the piezoelectric energy harvester is extended significantly.

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