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    Wyświetlanie 1-13 z 13
    Tytuł:
    An energy harvesting circuit for self-powered sensors
    Autorzy:
    Fernandes, J. R.
    Martins, M.
    Piedade, M.
    Goncalves, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/398011.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    prostownik dwupołówkowy
    odzyskiwanie energii
    power-harvesting
    full-wave rectifier
    Opis:
    In this work we present a prototype circuit to harvest energy from radio waves or through magnetic coupling based on a stack of full-wave rectifiers with transistors working on sub-threshold region. This circuit will use as an input a field-to-voltage converter capable of outputting a 200mV waveform and is able to self-start without any other energy sources. The circuit presented here is a proof of concept energy-harvesting circuit powering a low frequency ring oscillator which acts as the load. The circuit is designed, simulated and tested in a standard CMOS process, AMS CMOS 0.35 μm.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2011, 2, 1; 1-5
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uzyskiwanie energii za pomocą materiałów piezoelektrycznych
    Power harvesting with piezoelectric materials
    Autorzy:
    Zasada, K.
    Krawczuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/157084.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    zjawisko piezoelektryczne
    uzyskiwanie energii za pomocą piezoelektryków
    PZT
    PVDF
    PMN-PT
    piezoelectric
    power harvesting
    Opis:
    W artykule przedstawiono metody uzyskiwania energii za pomocą materiałów piezoelektrycznych. Piezoelektryki są materiałami, które mogą przetwarzać energię pochodzącą z drgań otocznia na energię elektryczną, która jest magazynowana i użyta do zasilania urządzeń. W ostatnim czasie wzrosło zapotrzebowanie na urządzenia w skali mikro, dlatego też wygenerowanie energii pochodzącej z piezoelektryków może okazać się alternatywą dla tradycyjnych i konwencjonalnych urządzeń zasilających [1]. W artykule zaprezentowane zostały przykłady urządzeń do uzyskiwania energii za pomocą różnych typów materiałów piezoelektrycznych.
    Purpose of this article is the presentation of potential application power harvesting by piezoelectric materials. Piezoelectric are materials, which transfer ambient vibration energy into electric one. Under the influence of elastic strain piezoelectric, the electric field is created in the material (simple piezoelectric effect). However, under the influence of the electric field piezoelectric's dimensions change (inverse piezoelectric effect). Thanks to these properties piezoelectric's were the focus of much research. Many attempts have been made using this type of funding, leading to the development of technologies: from the construction of various electromechanical generators after the surgical placement of piezoelectric materials in the flesh of animals. Last time many sources in micro scale become very popular because the generation of energy from piezoelectric can be conventional alternative for traditional energy sources. With this method we can get cheap and convenient source of energy. In the paper examples of devices, which are supplied by this kind of energy as well as types of piezoelectrics (PZT, PVDF and PMN-PT), materials used in described examples are presented.
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 445-449
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody pozyskiwania energii dla autonomicznych bezprzewodowych sieci czujnikowych
    Energy harvesting methods for autonomous wireless sensor networks
    Autorzy:
    Olszyna, J.
    Winiecki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/154481.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    rozproszone systemy pomiarowe
    autonomiczne bezprzewodowe sieci czujnikowe
    pozyskiwanie energii
    distributed measurement systems
    autonomous wireless sensor networks
    power harvesting
    Opis:
    W artykule przedstawiono metody pozyskiwania energii dla autonomicznych bezprzewodowych sieci czujnikowych. Pozyskiwanie energii w takich systemach odbywa się za pomocą dedykowanych układów, w niektórych przypadkach źródłem energii może być sam obiekt pomiarowy. Źródła energii odpowiednie dla ww. zastosowań możemy przyporządkować do jednej z kategorii: ruch i wibracje, różnica temperatur, promieniowanie świetlne i fale radiowe.
    The paper presents energy harvesting methods suitable for autonomous wireless sensor networks. The average power demand of a typical sensor is between 20-100 žW [1]. In such systems energy is harvested via dedicated circuits. In some cases a measured object can be an energy source. Energy sources adequate for the abovementioned applications can be assigned to one of the categories: movement and vibration, temperature differences, light radiation, radio-frequency waves [1, 2, 3]. An analysis of available solutions in terms of power density or dimensions of power harvesting circuit is required for each energy source. Another important issue is the energy source power characteristic and whether it is controllable. If harvested energy is not stored (battery), a key parameter becomes the average power. In the paper we take a close look at energy harvesting approaches, along with the underlying physics and the power output. The achievable power ranges from 0,1 žW/cm2 to 15 mW/cm2 (depending on the size of the energy harvesting unit). The highest power can be achieved with photovoltaic cells under direct exposure to the sunlight.
    Źródło:
    Pomiary Automatyka Kontrola; 2012, R. 58, nr 10, 10; 837-839
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power Allocation for Energy-Harvesting-based Fading Cognitive Multiple Access Channels : with or without Successive Interference Cancellation
    Autorzy:
    Li, Q.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/963855.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cognitive radio
    power allocation
    multiple access channels
    energy harvesting
    Opis:
    This paper considers a fading cognitive multiple access channel (CMAC), where multiple secondary users (SUs), who share the spectrum with a primary user (PU), transmit to a cognitive base station (CBS). A power station is assumed to harvest energy from the nature and then provide power to the SUs. We investigate the power allocation problems for such a CMAC to maximize the SU sum rate under the interference power constraint, the sum transmit power constraint and the peak transmit power constraint of each individual SU. In particular, two scenarios are considered: with successive interference cancellation (SIC) and without SIC. For the first scenario, the optimal power allocation algorithm is derived. For the second scenario, a heuristic algorithm is proposed. We show that the proposed algorithm with SIC outperforms the algorithm without SIC in terms of the SU sum rate, while the algorithm without SIC outperforms the algorithm with SIC in terms of the number of admitted SUs for a high sum transmit power limit and a low peak transmit power limit of each individual SU.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 65-72
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy harvesting shock absorber with linear generator and mechanical motion amplification
    Autorzy:
    Satpute, Nitin
    Iwaniec, Marek
    Narina, Ramesh
    Satpute, Sarika
    Powiązania:
    https://bibliotekanauki.pl/articles/2146637.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    motion amplification
    electric power
    energy harvesting
    efficiency
    numerical simulation
    amplifikacja ruchu
    energia elektryczna
    harvesting energii
    wydajność
    symulacja numeryczna
    Opis:
    Energy harvesting shock absorbers can generate about 15-20 W of electric power for normal suspension velocities. However, higher weight, fail safe characteristics and space limitations have restricted development of regenerative shock absorbers to research prototypes. Power to weight ratio of regenerative shock absorbers can be improved by incorporating motion amplification. In the presented work, an innovative design of energy harvesting shock absorber has been presented that uses motion amplification for improving harvesting efficiency. Apart from improving electric power, the proposed solution is fail safe and can be easily incorporated in existing vehicles with only marginal change in suspension layout. Study includes detailed numerical analysis for vibration transmissibility to investigate comfort and safety. Further, a prototype has been fabricated and experimentation has been performed to compute electric power generated and comfort. Simulations have been performed on real size model with utilization of harvested electric power which indicates about 19% of overall harvesting efficiency.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020104
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of mechanical motion amplification for vibration energy harvesting
    Autorzy:
    Satpute, Nitin
    Iwaniec, Marek
    Narina, Ramesh
    Satpute, Sarika
    Powiązania:
    https://bibliotekanauki.pl/articles/2146670.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    motion amplification
    electric power
    energy harvesting
    efficiency
    numerical simulation
    amplifikacja ruchu
    energia elektryczna
    harvesting energii
    efektywność
    symulacja numeryczna
    Opis:
    Vibration Energy Harvesting is being investigated for autonomous sensors and actuators that mainly utilize ambient and machine induced vibrations. Recently mechanical motion amplification is incorporated for improving power to weight ratio of vibration harvesters. The present study is motivated to investigate mechanical motion amplification characteristics with different configurations. The parameters investigated are motion amplification ratio, force transmissibility characteristics, weight of the electrical generator, effective damping coefficient achieved and linear nature of damping. Numerical analysis has been performed to compare important characteristics of device operating without amplification to that of with amplification with different configuration. The study has been concluded with comments on application of suitable type of amplification mechanism depending on weight/space constraints and desired effective damping coefficient.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 1; art. no. 2022113
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation and Compensation of IQ Imbalance in SWIPT System
    Autorzy:
    Nair, Ajin R.
    Kirthiga, S.
    Jayakumar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055272.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SWIPT
    power splitting
    iq imbalance
    energy harvesting
    hardware impairments
    blind compensation
    Opis:
    Although there are many articulations of SWIPT architecture implementations, the hardware impairment aspect involved in the SWIPT architecture system is not given much attention. This paper evaluates the performance of SWIPT PS Receiver architecture in the presence of IQ imbalance hardware impairment with 16-QAM transmitter and AWGN channel. The parameters SNR, BER is evaluated in the presence of amplitude, phase imbalance, and PS factor at the SWIPT receiver side. Further, the IQ imbalance is estimated and compensated using a blind compensation algorithm. The system achieved a maximum BER of 10−7 in the presence of amplitude and phase imbalance of 0.2 and 1.6 respectively.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 679--684
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy harvester based on Terfenol-D for low power devices
    Autorzy:
    Mech, R.
    Kaleta, J.
    Lewandowski, D.
    Wiewiórski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190061.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pozyskiwanie energii
    mikrokontroler
    materiał inteligentny
    harvesting energy
    low-power microcontroller
    smart material
    Opis:
    Rising requirements for a new constructions, force engineers to monitor them all day long. An attractive solution seems to be applications of wireless sensors. However, there is a barrier limiting their application, which is the need to supply them with an electrical power over extended period of time without using additional wiring or batteries. The potential solution of this problem seems to be an energy harvesting. This paper proposes a new energy harvesting device based on magnetostrictive material. In the course of the experiments with using Terfenol-D rods as actuators and sensors it has been shown, that the mechanical impact to the magnetic core based on Terfenol-D rod, NdFeB permanent magnets and coil set allowed to obtain an electric power signal enough to supply device of 100 Ohm load on their active state.
    Źródło:
    Interdisciplinary Journal of Engineering Sciences; 2014, 2, 1; 8--12
    2300-5874
    Pojawia się w:
    Interdisciplinary Journal of Engineering Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Experimental Investigation into Improving the Performance of Thermoelectric Generators
    Autorzy:
    Alahmer, Ali
    Khalid, Mohammad Bani
    Beithou, Nabil
    Borowski, Gabriel
    Alsaqoor, Sameh
    Alhendi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068454.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    thermoelectric generator
    liquid evaporation
    TEG performance
    enhancing power generation
    waste energy harvesting
    Opis:
    Low-temperature heat sources have become increasingly popular in recent years, particularly for energy generation. The majority of thermal devices in the market (including devices using solar energy, geothermal energy, waste energy, and so on) transform heat into electricity indirectly, requiring mechanical work before producing power. Through the Seebeck effect, the technology that employs a thermoelectric generator (TEG) may directly transform heat energy into electricity. The TEG technology provides several advantages, including compactness, quietness, and the absence of moving components. TEGs have a low thermal and electrical efficiency, which is one of their main drawbacks. Therefore, the performance of a thermoelectric generator is improved by employing liquid evaporation heat transfer in this manuscript. The performance of the thermoelectric was examined experimentally and compared to the liquid evaporation mode under varied heat flux values and different modes of heat transfer in terms of free and forced convection with and without fins. The experimental results revealed that when compared to free convection without fins, adopting forced liquid evaporation convection would improve TEG voltage variation by 435.9%.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 3; 100--108
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the energy harvestable from an airless tire equipped with piezoelectric bimorphs on the lamellar spokes
    Autorzy:
    Suciu, C. V.
    Koyanagi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307907.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    airless tire
    bending and buckling
    energy harvesting
    generated electrical power
    piezoelectric bimorph
    spoke
    Opis:
    In this work, one evaluates the electrical power generated by an airless tire equipped with piezoelectric bimorphs on both lateral surfaces of the radially distributed lamellar spokes. Such sheet-like spokes are hinged both toward the wheel drum at the inner annular band, and toward the wheel tread at the outer annular band. Since the hinged spokes are able to transmit tension forces but unable to transmit compression forces, bending and buckling of the spokes occur in the region of contact between the tire and the road. Models for the rolling friction of the airless tire, for the bending and buckling deformation of the spokes, and for the electrical power generated by the airless tire are suggested. Variation of the curvature radii and bending deformations for the spokes in the region of contact with the road are illustrated for various values of the rolling friction coefficient and spoke length. Then, variation of the generated electrical power versus the length of contact is obtained for various travel speeds of the vehicle. One observes that the generated electrical power increases at augmentation of the rolling friction coefficient, spoke length and travel speed. Although the obtained electrical power for the proposed harvesting system is relatively modest, it is not depending on the road roughness, i.e. harvesting becomes possible even on smooth roads, such as highway surfaces.
    Źródło:
    Journal of Telecommunications and Information Technology; 2013, 4; 79-84
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    RF energy harvesting for low power electronic devices: student project
    Autorzy:
    Mihaylov, K
    Powiązania:
    https://bibliotekanauki.pl/articles/397947.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    wireless power
    RF energy harvesting
    small loop antenna
    zasilanie bezprzewodowe
    RF
    energia wysokiej częstotliwości
    antena magnetyczna
    Opis:
    Different methods for RF energy harvesting from radio transmitters with working frequency of up to 108 MHz are examined. Experiments are conducted especially with the LW transmitter near Vakarel village (261 kHz) (Sofia, Bulgaria) and the transmitter of the National Radio “HristoBotev” at radio- tower “Kopitoto” (92. 9 MHz) (Sofia, Bulgaria). Partial success is achieved with electrically small loop antenna resonated at 261 kHz.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2014, 5, 1; 41-45
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A MOSFET only, step-up DC DC micro power converter, for solar energy harvesting applications
    Autorzy:
    Carvalho, C.
    Paulino, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/398057.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    układy CMOS
    elektronika
    energia zbiorów
    układy zarządzania energią
    komórki fotowoltaiczne
    CMOS circuits
    electronics
    energy harvesting
    power management circuits
    PV cells
    Opis:
    In this paper, a step-up micro power converter for solar energy harvesting applications is presented. The circuit is based on a switched-capacitor voltage doubler architecture with MOSFET capacitors, which results in an area approximately eight times smaller than using MiM capacitors for the 0.13 žm CMOS technology. In order to compensate for the loss of efficiency, due to the larger parasitic capacitances, a charge reutilization scheme is employed. The circuit uses a phase controller, designed specifically to work with the series of two PV cells, in order to regulate the output voltage to 1.2 V. Electrical simulations of the circuit, together with an equivalent electrical model of a PV cell, show that the circuit can deliver a power of 536.1 žW to the load, while drawing a power of 799.8 žW from two PV cells stacked in series, corresponding to a maximum efficiency of 67%.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 2; 112-119
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Analysis of a Thermoelectric Cooler Placed between Two Thermoelectric Generators for Different Heat Transfer Conditions
    Autorzy:
    Alsaqoor, Sameh
    Powiązania:
    https://bibliotekanauki.pl/articles/24201669.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    thermoelectric cooler
    sandwich TEC
    TEG performance
    thermoelectric generator
    heat transfer conditions
    enhancing power generation
    low energy harvesting
    renewable energy induction
    Opis:
    The thermoelectric cooler (TEC) and thermoelectric generator (TEG) modules have several appealing features, including fixed parts, high reliability, low maintenance costs, and seamless connection with other heating equipment, accompaniment, can be powered by a variety of low-energy renewable energy sources such as solar water/air collectors, ground heat exchangers or heat from biomass. The thermoelectric assembly was integrated into the TEC using the TEG in this study. A prototype was developed in which recently developed thermoelectric modules were integrated into a thermoelectric cooler. For this purpose, a TEC sandwiched between two TEGs with different heat transfer conditions was established, to simulate the heat transfer and thermoelectric behavior of both the TEG and the TEC system, and evaluate the effect of the combined TEG-TEC on the performance parameters of the good system by comparing different cooling modes ranging from natural convection, forced convection, and water-cooling tests. It was shown that to the natural convection of heat transfer, as the TEC voltage increases, the hot surface temperature of the upper TEG increases, and the cold surface temperature of the lower TEG decreases, where the lowest TEC temperature reaches 1.36 A. When using forced convection (by using a fan), the temperature profile decreases over time, starting at around 70 °C for 7V, and after almost 60 minutes, the temperature drops to around 45 °C for 3V. This turned out to be a match between experiment and theory in all traces shown, with a voltage difference of 25 mV for 3V TEC and ending at 70 mV for 8V TEC.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 4; 27--35
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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