scholarly journals Textile Triboelectric Nanogenerators with Diverse 3D-Spacer Fabrics for Improved Output Voltage

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 937
Author(s):  
Dae-Hyeon Kwon ◽  
Jin-Hyuk Kwon ◽  
Jaebum Jeong ◽  
Youngju Lee ◽  
Swarup Biswas ◽  
...  
Keyword(s):  
Output Voltage ◽  
Surface Friction ◽  
Power Devices ◽  
Fabric Structure ◽  
3D Morphology ◽  
Application Potential ◽  
Triboelectric Nanogenerators ◽  
Voltage Performance ◽  
Spacer Fabrics ◽  
Morphology Influence

Electrically superior triboelectric nanogenerators (TENG) using 3D fabric and PDMS show great application potential for biokinetic energy harvesting and multifunctional self-power devices. In this study, TENG with fabric-PDMS-fabric structure was produced using various 3D fabrics and PDMS. The peak-to-peak output voltage of various 3D fabrics was compared. The output voltage changes due to structure and vertical fibers. Also, the coefficient of surface friction between the PDMS and the fabric improves the output voltage. TENG using different 3D-spacer polymeric fabrics showed different maximum peak-to-peak output voltage performance. It is attributed to the stiffness, lateral elasticity and 3D morphology of the fabrics. It is considered that those factors including stiffness, lateral elasticity and 3D morphology influence the densities in vertical and lateral fiber to fiber interaction.

Importance of Architectural Asymmetry for Improved Triboelectric Nanogenerators with 3D Spacer Fabrics

2021 ◽  
Vol 29 (6) ◽  
pp. 443-447
Author(s):  
Jin-Hyuk Kwon ◽  
Jaebum Jeong ◽  
Youngju Lee ◽  
Swarup Biswas ◽  
Jun-Kyu Park ◽  
...  
Keyword(s):  
Triboelectric Nanogenerators ◽  
Spacer Fabrics

Carbon Nano Tube-Polymer Hybrid Nanocomposite Electrodes for Porous Polydimethylsiloxane Sponge-Based Flexible Triboelectric Nanogenerators

2021 ◽  
Vol 21 (9) ◽  
pp. 4680-4684
Author(s):  
Dae-Hyeon Kwon ◽  
Jaebum Jeong ◽  
Yongju Lee ◽  
Jun-Kyu Park ◽  
Suwoong Lee ◽  
...  
Keyword(s):  
Power Density ◽  
Output Voltage ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Flexible Electrodes ◽  
Flexible Devices ◽  
Copper Electrodes ◽  
Polymer Hybrid ◽  
Triboelectric Nanogenerators ◽  
Carbon Nano Tube

Flexible triboelectric nanogenerators (TENGs) have attracted much attention because of its environmentally friendly, practical, and cost-producing advantages. In flexible TENGs, it is important to study the flexible electrodes in order to fabricate the fully flexible devices. Here, we compared electrical characteristics of the sponge porous polydimethylsiloxane (PDMS)-based flexible TENGs with two types of flexible electrodes, copper and carbon nanotube (CNT)-PDMS electrodes. The output voltage and maximum power density of sponge PDMS-based flexible TENGs with copper and CNTPDMS electrodes were compared. The voltage and power density of sponge PDMS-based flexible TENGs with CNT-PDMS electrodes were improved compare to those with copper electrodes. The output voltage and the maximum power density of sponge PDMS-based flexible TENGs with copper and CNT-PDMS electrodes increased 4 times and 7 times, respectively. It is attributed to higher electrical conductivity and stably flow electricity of CNT than those of copper.

Design and manufacture of three-dimensional auxetic warp-knitted spacer fabrics based on re-entrant and rotating geometries

2021 ◽  
pp. 004051752110372
Author(s):  
Chang Yuping ◽  
Yanping Liu ◽  
Zhao Shuaiquan ◽  
Hu Hong
Keyword(s):  
High Efficiency ◽  
Three Dimensional ◽  
Fabric Structure ◽  
Spacer Fabric ◽  
Wide Range ◽  
Yarn Guide ◽  
Tensile Strains ◽  
Spacer Fabrics ◽  
Fabric Structures ◽  
Design And Manufacture

Warp knitting technology is a fabric-forming technologies that is very suitable to fabricate three-dimensional (3D) auxetic fabrics due to its high efficiency and powerful pattern designing possibilities. In this study, two typical auxetic geometries, namely the re-entrant hexagonal network and rotating square solids, were selected as the design prototypes for the design and manufacture of 3D warp-knitted spacer fabrics. While two 3D warp-knitted spacer fabric structures with representative units of different sizes designed based on the re-entrant hexagonal geometry were manufactured by using a RD7 double needle bar Raschel machine with seven yarn guide bars, two 3D jacquard warp-knitted spacer fabrics with different base fabric structures designed based on the rotating squares geometry were fabricated by using a RDPJ4/2 double needle bar jacquard machine with two ground yarn guide bars and four jacquard guide bars. The Poisson’s ratios of these 3D warp-knitted fabrics in the course direction and wale direction were evaluated respectively through constant-rate tensile tests. The results revealed that the re-entrant hexagonal fabric structure with double chain stitches has auxetic behavior across a wide range of tensile strains along the course direction, while the rotating square fabric structure with elastic chain stitches as the base is auxetic within a narrow range of tensile strains along the wale direction. The study provides an alternative method to directly produce auxetic warp-knitted spacer fabrics through a single knitting process instead of using an additional post-compression and heat-setting process.

scholarly journals Simplified cascade multiphase DC-DC boost power converters for high voltage-gain and low-ripple applications

2021 ◽  
Vol 12 (1) ◽  
pp. 273
Author(s):  
Pekik Argo Dahono
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Power Converters ◽  
Voltage Gain ◽  
Power Devices ◽  
Switching Power ◽  
Voltage Drops ◽  
High Voltage Gain ◽  
Basic Performance ◽  
Phase Number

This paper proposes two new simplified cascade multiphase DC-DC boost power converters with high voltage-gain and low ripple. All simplifications reduce the number of active switching devices from <em>2N</em> into <em>N</em>, where <em>N</em> is the phase number. The first simplification reduces the number of inductors from <em>2N</em> into <em>N+1</em> and increases the number of diodes from <em>2N</em> into (<em>2N+1</em>). The second simplification reduces the number of inductors from <em>2N</em> into <em>N+1</em> and increases the number of diodes from <em>2N</em> into (<em>3N+1</em>). The second simplification needs inductors with smaller current rating than the first simplification. The expressions of output voltage as a function of load current are derived by taking into account the voltage drops across the inductors and switching power devices. Simulated and experimental results are included to show the basic performance of the proposed cascade multiphase DC-DC boost power converters.

Thermoelectric Power Devices Based on InN Thin Films

2006 ◽  
Vol 973 ◽  
Author(s):  
Takayuki Matsumoto ◽  
Shigeo Yamaguchi ◽  
Atsushi Yamamoto
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Thermoelectric Power ◽  
Output Power ◽  
Output Voltage ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Power Devices ◽  
Polyimide Films ◽  
Radio Frequency Sputtering

ABSTRACTWe have studied the temperature dependence of thermoelectric properties of amorphous InN thin films prepared by reactive radio-frequency sputtering. We fabricated 60-pair and 120-pair InN-chromel films, which were deposited on polyimide films. For the 120-pair device, the maximum open output voltage and the maximum output power were 210 mV and 65 nW, respectively, at temperature difference of 168 K.

The Operating Improvement of the Supply Source and the Optimization of PWM Control

2015 ◽  
Vol 6 (3) ◽  
pp. 603
Author(s):  
Farouk Hadj Benali ◽  
Fouad Azzouz ◽  
Ghalem Bachir
Keyword(s):  
Output Voltage ◽  
Control Strategies ◽  
Input Voltage ◽  
Multilevel Inverter ◽  
Pwm Control ◽  
Supply Source ◽  
Multilevel Inverters ◽  
Control Techniques ◽  
Voltage Performance

In this paper the operating improvement of the supply source and the optimization of PWM control are proposed. A comparison (based on the better operating in terms of input voltage) between the multilevel inverters (NPC multilevel inverter and H bridge inverter) is studied. Then two control strategies (the SPWM and the suboptimal PWM) are applied to the multilevel inverter which has the better voltage performance. At last a comparison between these two control techniques based on two essential points, the THD and the output voltage value. A comparison between our results and results taken from literature is also presented in this paper. Simulations are carried out using PSIM environment.

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