Articles de revues : « Harvester interface »

1

Morel, Adrien, Alexis Brenes, David Gibus, Elie Lefeuvre, Pierre Gasnier, Gaël Pillonnet et Adrien Badel. « A comparative study of electrical interfaces for tunable piezoelectric vibration energy harvesting ». Smart Materials and Structures 31, n^o 4 (7 mars 2022) : 045016. http://dx.doi.org/10.1088/1361-665x/ac54e8.

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Abstract The present work deals with tunable electrical interfaces able to enhance both the harvested power and bandwidth of piezoelectric vibration energy harvesters. The aim of this paper is to propose a general, normalized, and unified performance evaluation (with respect to the harvested power and bandwidth) of the various electrical strategies that can tune the harvester’s frequency response. By mean of a thorough analysis, we demonstrate how such interfaces influence the electromechanical generator response through an electrically-induced damping and an electrically-induced stiffness. The choice of the strategy determines these two electrical quantities, and thus the achievable frequency response of the system. Thereafter, we introduce a collection of graphical and analytical tools to compare and analyze single- and multi-tuning electrical strategies, including a qualitative performance evaluation of existing strategies. Finally, we establish a unified comparison of single- and multiple-tuning strategies which is supported by the definition and evaluation of a new optimization criterion. This comparison reveals which strategy performs best depending on the electromechanical coupling of the piezoelectric harvester and on the losses in the electrical interface. Furthermore, it quantifies the power and bandwidth gain brought by single- and multi-tuning strategies. Such quantitative criterion provides guidance for the choice of a harvesting strategy in any specific applicative case.

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Liu, Jiqiang, Junjie Yang, Ruofeng Han, Qisheng He, Dacheng Xu et Xinxin Li. « Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester ». Energies 13, n^o 15 (25 juillet 2020) : 3830. http://dx.doi.org/10.3390/en13153830.

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The vibration-threshold-triggered piezoelectric energy harvester is a new type of piezoelectric energy harvester with a two-stage structure, which can generate electricity in a low frequency environment and recognize vibration intensity at the same time. In this study, a theoretical model of a vibration-threshold-triggered energy harvester was examined, and an equivalent circuit model of the energy harvester was obtained. Then, an interface circuit was proposed that can significantly improve the output power of the energy harvester. The interface circuit achieved impedance matching with the piezoelectric material to maximize the energy collected from the energy harvester. First, we calculated and analyzed the impedance characteristics of the energy harvester, based on the equivalent circuit model. It was found that because the piezoelectric material is in resonance as the energy harvester is in operation, the corresponding impedance is almost resistance. Therefore, a resistance-matching strategy was proposed. Last, we proposed an interface circuit with adjustable input impedance to achieve resistance matching. The experimental results show that the proposed interface circuit can increase the output power of the energy harvester by 48.1–55.7% over that achieved with the standard interface circuit.

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Chen, Yu-Yin, Dejan Vasic, Yuan-Ping Liu et François Costa. « Study of a piezoelectric switching circuit for energy harvesting with bistable broadband technique by work-cycle analysis ». Journal of Intelligent Material Systems and Structures 24, n^o 2 (27 septembre 2012) : 180–93. http://dx.doi.org/10.1177/1045389x12460339.

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In this article, a piezoelectric energy harvesting device comprises a bistable vibrating cantilever beam and a switching-type interface circuit (synchronized switching harvesting on an inductor) is proposed, and the resulting performance is compared to the traditional linear technique. It was known that the synchronized switching techniques increase efficiently the output power of the piezoelectric energy harvester for low-coupled structures. However, the traditional piezoelectric energy harvester based on a cantilever beam is only efficient at resonance. To broaden the available bandwidth, a bistable nonlinear technique was proposed. In this article, the bistable technique and synchronized switching harvesting on an inductor interface are combined together to accomplish a more efficient broadband piezoelectric energy harvester. The power flow and work cycles are adopted to simplify the analysis of the switching techniques and then summarize the increasing performance of the nonlinear piezoelectric harvester. Finally, simulation results and experimental validations show that the proposed integrated device owns larger bandwidth and collects more harvested energy.

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Morel, Adrien, Adrien Badel, Romain Grézaud, Pierre Gasnier, Ghislain Despesse et Gaël Pillonnet. « Resistive and reactive loads’ influences on highly coupled piezoelectric generators for wideband vibrations energy harvesting ». Journal of Intelligent Material Systems and Structures 30, n^o 3 (18 novembre 2018) : 386–99. http://dx.doi.org/10.1177/1045389x18810802.

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One of the main challenges in energy harvesting from ambient vibrations is to find efficient ways to scavenge the energy, not only at the mechanical system resonance but also on a wider frequency band. Instead of tuning the mechanical part of the system, as usually proposed in the state of the art, this article develops extensively the possibility to tune the properties of the harvester using the electrical interface. Due to the progress in materials, piezoelectric harvesters can exhibit relatively high electromechanical coupling: hence, the electrical part can now have a substantial influence on the global parameters of the piezoelectric system. In order to harness the energy efficiently from this kind of generator on a wide frequency band, not only the electrical load’s effect on the harvester’s damping should be tuned but also its effect on the harvester’s stiffness. In this article, we present an analytical analysis of the influences of the resistive and reactive behavior of the electrical interface on highly coupled piezoelectric harvesters. We develop a normalized study of the multiphysics interactions, reducing the number of parameters of the problem to a few physically meaningful variables. The respective influence of each of these variables on the harvesting power has been studied and led us to the optimal electrical damping expression and the influences of the damping and of the coupling on the equivalent admittance of the piezoelectric energy harvester. Finally, we linked these normalized variables with real reactive load expressions, in order to study how a resistive, capacitive, and inductive behavior could affect the global performances of the system. The theoretical analysis and results are supported by experimental tests on a highly coupled piezoelectric system [Formula: see text]. Using an adequate tuning of a RC load at each frequency, the maximum harvested power [Formula: see text] under a small acceleration amplitude of [Formula: see text] is reached over a 14 Hz large frequency band around 105 Hz which has been predicted by the model with less than 5% error.

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Aranda, Jesus Javier, Sebastian Bader et Bengt Oelmann. « Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester ». Sensors 21, n^o 4 (23 février 2021) : 1546. http://dx.doi.org/10.3390/s21041546.

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Condition monitoring devices in hydraulic systems that use batteries or require wired infrastructure have drawbacks that affect their installation, maintenance costs, and deployment flexibility. Energy harvesting technologies can serve as an alternative power supply for system loads, eliminating batteries and wiring requirements. Despite the interest in pressure fluctuation energy harvesters, few studies consider end-to-end implementations, especially for cases with low-amplitude pressure fluctuations. This generates a research gap regarding the practical amount of energy available to the load under these conditions, as well as interface circuit requirements and techniques for efficient energy conversion. In this paper, we present a self-powered sensor that integrates an energy harvester and a wireless sensing system. The energy harvester converts pressure fluctuations in hydraulic systems into electrical energy using an acoustic resonator, a piezoelectric stack, and an interface circuit. The prototype wireless sensor consists of an industrial pressure sensor and a low-power Bluetooth System-on-chip that samples and wirelessly transmits pressure data. We present a subsystem analysis and a full system implementation that considers hydraulic systems with pressure fluctuation amplitudes of less than 1 bar and frequencies of less than 300 Hz. The study examines the frequency response of the energy harvester, the performance of the interface circuit, and the advantages of using an active power improvement unit adapted for piezoelectric stacks. We show that the interface circuit used improves the performance of the energy harvester compared to previous similar studies, showing more power generation compared to the standard interface. Experimental measurements show that the self-powered sensor system can start up by harvesting energy from pressure fluctuations with amplitudes starting at 0.2 bar at 200 Hz. It can also sample and transmit sensor data at a rate of 100 Hz at 0.7 bar at 200 Hz. The system is implemented with off-the-shelf circuits.

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Wang, Shih-Wei, Yi-Wen Ke, Po-Chiun Huang et Ping-Hsuan Hsieh. « Electromagnetic Energy Harvester Interface Design for Wearable Applications ». IEEE Transactions on Circuits and Systems II : Express Briefs 65, n^o 5 (mai 2018) : 667–71. http://dx.doi.org/10.1109/tcsii.2018.2820158.

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Elliott, A. D. T., et P. D. Mitcheson. « Piezoelectric energy harvester interface with real-time MPPT ». Journal of Physics : Conference Series 557 (27 novembre 2014) : 012125. http://dx.doi.org/10.1088/1742-6596/557/1/012125.

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Al-Najati, Ibrahim Ali Hameed, Keng Wai Chan et Swee-Yong Pung. « Tire strain piezoelectric energy harvesters : a systematic review ». International Journal of Power Electronics and Drive Systems (IJPEDS) 13, n^o 1 (1 mars 2022) : 444. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp444-459.

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Intelligent tires are regular tires with additional sensors attached to measure different parameters, such as pressure, temperature, and tire dynamic condition. Sensors mounted inside tires are usually powered by batteries. An alternative power source for these sensors is piezoelectric energy, which uses piezoelectric patches that can be mounted close to the sensors inside vehicle tires. Piezoelectric energy is a battery-less energy source with a long lifespan and environmentally friendly characteristics. This paper presents a comprehensive review of piezoelectric energy harvesters that harvest vehicle tire strain and convert it to electrical energy to power inner tire sensors. The aim of this review was to characterize the possible available tire piezoelectric strain energy harvesters and their advantages and challenges for each type, shape, and material used by researchers so far. The related articles were categorized according to the installation method of the harvester inside the vehicle tire. The four categories are inner tire treadwall, tire bead–rim interface, tire inner sidewall, and tire bead. The maximum power generated was 2300 mW from a treadwall tire strain piezoelectric harvester. Ten challenges were mentioned and classified into three main groups: host environment, installation method, and scavenging system.

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Anand, Nadish, et Richard Gould. « Analysis of a Symmetrical Ferrofluid Sloshing Vibration Energy Harvester ». Fluids 6, n^o 8 (22 août 2021) : 295. http://dx.doi.org/10.3390/fluids6080295.

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Ferrofluid sloshing vibration energy harvesters use ferrofluid sloshing movement as a moving magnet between a fixed coil to induce current and, in turn, harvest energy from external excitations. A symmetric ferrofluid sloshing vibration energy harvester configuration is introduced in this study which utilizes four external, symmetrically placed, permanent magnets to magnetize a ferrofluid inside a tank. An external sinusoidal excitation of amplitude 1 m/s2 is imparted, and the whole system is studied numerically using a level-set method to track the sharp interface between ferrofluid and air. The system is studied for two significant length scales of 0.1 m and 0.05 m while varying the four external magnets’ polarity arrangements. All of the system configuration dimensions are parametrized with the length scale to keep the system configuration invariant with the length scale. Finally, a frequency sweep is performed, encompassing the structure’s first modal frequency and impedance matching to obtain the system’s energy harvesting characteristics.

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Dallago, Enrico, Alberto Danioni, Marco Marchesi, Valeria Nucita et Giuseppe Venchi. « A Self-Powered Electronic Interface for Electromagnetic Energy Harvester ». IEEE Transactions on Power Electronics 26, n^o 11 (novembre 2011) : 3174–82. http://dx.doi.org/10.1109/tpel.2011.2146277.

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Asthana, Prateek, et Gargi Khanna. « Power amplification interface circuit for broadband piezoelectric energy harvester ». Microelectronics Journal 98 (avril 2020) : 104734. http://dx.doi.org/10.1016/j.mejo.2020.104734.

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Pelletier, Mathew G., John D. Wanjura et Greg A. Holt. « Man-Machine-Interface Software Design of a Cotton Harvester Yield Monitor Calibration System ». AgriEngineering 1, n^o 4 (21 octobre 2019) : 511–22. http://dx.doi.org/10.3390/agriengineering1040037.

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Several yield monitors are available for use on cotton harvesters, but none are able to maintain yield measurement accuracy across cultivars and field conditions that vary spatially and/or temporally. Thus, the utility of yield monitors as tools for on-farm research is limited unless steps are taken to calibrate the systems as cultivars and conditions change. This technical note details the man-machine-interface software system design portion of a harvester-based yield monitor calibration system for basket-type cotton strippers. The system was based upon the use of pressure sensors to measure the weight of the basket by monitoring the static pressure in the hydraulic lift cylinder circuit. To ensure accurate weighing, the system automatically lifted the basket to a target lift height, allowed basket time to settle, then weighed the contents of the basket. The software running the system was split into two parts that were run on an embedded low-level micro-controller, and a mobile computer located in the harvester cab. The system was field tested under commercial conditions and found to measure basket load weights within 2.5% of the reference scale. As such, the system was proven to be capable of providing an on-board auto-correction to a yield monitor for use in multi-variety field trials.

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Becker, Philipp, Erwin Hymon, Bernd Folkmer et Yiannos Manoli. « High efficiency piezoelectric energy harvester with synchronized switching interface circuit ». Sensors and Actuators A : Physical 202 (novembre 2013) : 155–61. http://dx.doi.org/10.1016/j.sna.2013.04.030.

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Badel, Adrien, et Elie Lefeuvre. « Wideband Piezoelectric Energy Harvester Tuned Through its Electronic Interface Circuit ». Journal of Physics : Conference Series 557 (27 novembre 2014) : 012115. http://dx.doi.org/10.1088/1742-6596/557/1/012115.

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Becker, P., E. Hymon, B. Folkmer et Y. Manoli. « High Efficiency Piezoelectric Energy Harvester with Synchronized Switching Interface Circuit ». Procedia Engineering 47 (2012) : 394–97. http://dx.doi.org/10.1016/j.proeng.2012.09.166.

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Buccolini, Luca, et Massimo Conti. « An Energy Harvester Interface for Self-Powered Wireless Speed Sensor ». IEEE Sensors Journal 17, n^o 4 (15 février 2017) : 1097–104. http://dx.doi.org/10.1109/jsen.2016.2635940.

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Kulkarni, Vainatey, Frédéric Giraud, Christophe Giraud-Audine, Michel Amberg, Ridha Ben Mrad et S. Eswar Prasad. « Integration of a torsion-based shear-mode energy harvester and energy management electronics for a sensor module ». Journal of Intelligent Material Systems and Structures 28, n^o 10 (3 novembre 2016) : 1346–57. http://dx.doi.org/10.1177/1045389x16672563.

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This work demonstrates the ability of a torsion-based shear-mode energy harvester to power a sensor module by integrating a temperature sensor circuit with a purpose developed piezoelectric energy harvester. A 10-cm3 energy harvester was developed for this application and was found to produce over 200 µW of maximum power through an optimal load resistance under 0.25 gpk acceleration excitation at its resonant frequency of 237 Hz. This harvester was then tested with two interface circuits: a standard interface diode bridge rectifier and a nonlinear synchronous electrical charge extraction circuit that were compared for their suitability in powering the sensor module. Through this, the synchronous electrical charge extraction nonlinear conditioning circuit was found to have superior performance when charging a capacitor and with DC loads at low voltages and was capable of providing a maximum power output of 37 µW under 0.25 gpk acceleration at 237 Hz. This output power was then used to successfully power a temperature sensor module consisting of a temperature sensor, a microcontroller, and a radio-frequency identification memory chip at a sensing frequency of 0.5 Hz.

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Węglarski, Mariusz, Piotr Jankowski-Mihułowicz, Grzegorz Pitera, Dominik Jurków et Mateusz Dorczyński. « LTCC Flow Sensor with RFID Interface ». Sensors 20, n^o 1 (2 janvier 2020) : 268. http://dx.doi.org/10.3390/s20010268.

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The idea of battery-less flow sensors and their implementation in wireless measurement systems is presented in this research article. The authors take advantage of their latest achievements in the Low Temperature Co-fired Ceramic (LTCC) technology, RadioFrequency Identification (RFID) technique, and increasing availability of low power electronics in order to get rid of the need to use electrochemical cells in a power supply unit of the elaborated device. To reach this assumption, special care has to be put on the energy balance in such an autonomous sensor node. First of all, the new concept of an electromagnetic LTCC turbine transducer with a signal conditioner which only draws a current of around 15 µA, is proposed for measuring a flow rate of fluids. Next, the autonomy of the device is showed; measured data are gathered in a microcontroller memory and sent to a control unit via an RFID interface which enables both information exchange and power transfer. The energy harvested from the electromagnetic field is used to conduct a data transmission, but also its excess can be accumulated, so the proposed sensor operates as a semi-passive transponder. The total autonomy of the device is achieved by implementing a second harvester that continually gathers energy from the environmental electromagnetic field of common active radio systems (e.g., Global System for Mobile Communications (GSM), wireless network Wi-Fi).

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Salami, Mitra, Tahereh Fanaei Sheikholeslami et Samira Fathi. « Efficiency Increasing of Thermoelectric Micro Generator Using Carbon Nanotube Interface ». Advanced Materials Research 829 (novembre 2013) : 217–21. http://dx.doi.org/10.4028/www.scientific.net/amr.829.217.

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Thermoelectric (TE) devices are an interested family of energy harvesters which could convert the thermal energy into electricity. However, the temperature drops at interface between thermoelectric materials and heat source, heat sink and electrodes reduce efficiency of thermoelectric devices. As a solution, thermal interface materials (TIM) which have high thermal conductance and low thermal interface resistance with adjacent materials are added to the device. In this paper, the organic material is considered as the base material for a TE energy harvester device. Also, carbon nanotube (CNT) is applied as TIM, because of its high one dimentional electrical and thermal conductance. A finite element analysis is carried out in order to investigate the role of thermal contact resistance on heat transfer at TE device. To do this, a thermoelectric leg is simulated with two structure consist of (a) TE material and electrodes in direct contact (b) TE material and electrodes with CNT interface and the results are compared. It is shown that CNT layer reduces heat dissipation at the interface and so the temperature difference at the both sides of polymer is increased, which finally results the enhancement of device output voltage.

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Zhang, Ya Wei, Dong Wang et Shu Mao Wang. « Combine Harvester Noise and Emissions Detecting System Based on Virtual Instrument ». Applied Mechanics and Materials 644-650 (septembre 2014) : 1019–22. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.1019.

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To evaluate the noise and emissions of combine harvest meet the national standards or not, a noise and emissions testing and analyzing system was developed based on virtual instrument. A high precision digital noise level meter and an opacimeter were connected to a computer via a RS232 cable, and used to detect the noise and emissions of a working combine harvester respectively. A measurement and control software was developed to collect, process and analysis the measured data automatically in real-time, and the experimental data also could be stored and printed when necessary. The analyzed results were shown on the software interface by curves and LED. To verify the stability and reliability of the system, a serial of tests were made with a Xinjiang-2A combine harvester, the results showed that this detection system meet the need of different kinds of practical applications.

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Ben Ammar, Meriam Ben, Salwa Sahnoun, Ahmed Fakhfakh, Christian Viehweger et Olfa Kanoun. « Self-Powered Synchronized Switching Interface Circuit for Piezoelectric Footstep Energy Harvesting ». Sensors 23, n^o 4 (6 février 2023) : 1830. http://dx.doi.org/10.3390/s23041830.

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Piezoelectric Vibration converters are nowadays gaining importance for supplying low-powered sensor nodes and wearable electronic devices. Energy management interfaces are thereby needed to ensure voltage compatibility between the harvester element and the electric load. To improve power extraction ability, resonant interfaces such as Parallel Synchronized Switch Harvesting on Inductor (P-SSHI) have been proposed. The main challenges for designing this type of energy management circuits are to realise self-powered solutions and increase the energy efficiency and adaptability of the interface for low-power operation modes corresponding to low frequencies and irregular vibration mechanical energy sources. In this work, a novel Self-Powered (SP P-SSHI) energy management circuit is proposed which is able to harvest energy from piezoelectric converters at low frequencies and irregular chock like footstep input excitations. It has a good power extraction ability and is adaptable for different storage capacitors and loads. As a proof of concept, a piezoelectric shoe insole with six integrated parallel piezoelectric sensors (PEts) was designed and implemented to validate the performance of the energy management interface circuit. Under a vibration excitation of 1 Hz corresponding to a (moderate walking speed), the maximum reached efficiency and power of the proposed interface is 83.02% and 3.6 mW respectively for the designed insole, a 10 kΩ resistive load and a 10 μF storage capacitor. The enhanced SP-PSSHI circuit was validated to charge a 10 μF capacitor to 6 V in 3.94 s and a 1 mF capacitor to 3.2 V in 27.64 s. The proposed energy management interface has a cold start-up ability and was also validated to charge a (65 mAh, 3.1 V) maganese dioxide coin cell Lithium battery (ML 2032), demonstrating the ability of the proposed wearable piezoelectric energy harvesting system to provide an autonomous power supply for wearable wireless sensors.

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Liu, Haili, Rui Hua, Yang Lu, Ya Wang, Emre Salman et Junrui Liang. « Boosting the efficiency of a footstep piezoelectric-stack energy harvester using the synchronized switch technology ». Journal of Intelligent Material Systems and Structures 30, n^o 6 (8 février 2019) : 813–22. http://dx.doi.org/10.1177/1045389x19828512.

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In this article, the self-supported power conditioning circuits are studied for a footstep energy harvester, which consists of a monolithic multilayer piezoelectric stack with a force amplification frame to extract electricity from human walking locomotion. Based on the synchronized switch harvesting on inductance (SSHI) technology, the power conditioning circuits are designed to optimize the power flow from the piezoelectric stack to the energy storage device under real-time human walking excitation instead of a simple sine waveform input, as reported in most literatures. The unique properties of human walking locomotion and multilayer piezoelectric stack both impose complications for circuit design. Three common interface circuits, for example, standard energy harvesting circuit, series-SSHI, and parallel-SSHI, are compared in terms of their output power to find the best candidate for the real-time-footstep energy harvester. Experimental results show that the use of parallel-SSHI circuit interface produces 74% more power than the standard energy harvesting counterpart, while the use of series-SSHI circuit demonstrates a similar performance in comparison to the standard energy harvesting interface. The reasons for such a huge efficiency improvement using the parallel-SSHI interface are detailed in this article.

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Bedier, Mohammed, Philippe Basset et Dimitri Galayko. « A Smart Load Interface and Voltage Regulator for Electrostatic Vibration Energy Harvester ». Journal of Physics : Conference Series 773 (novembre 2016) : 012105. http://dx.doi.org/10.1088/1742-6596/773/1/012105.

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Wu, Yi-Chieh, Einar Halvorsen, Mickael Lallart, Claude Richard et Daniel Guyomar. « Stochastic Modeling in the Frequency Domain for Energy Harvester With Switching Electronic Interface ». IEEE/ASME Transactions on Mechatronics 20, n^o 1 (février 2015) : 50–60. http://dx.doi.org/10.1109/tmech.2014.2308930.

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Wang, H. M., et L. Zou. « The performance of a piezoelectric cantilevered energy harvester with an imperfectly bonded interface ». Smart Materials and Structures 22, n^o 5 (10 avril 2013) : 055018. http://dx.doi.org/10.1088/0964-1726/22/5/055018.

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Spinelli, Raffaele, et Angelo de Arruda Moura. « Decreasing the Fuel Consumption and CO2 Emissions of Excavator-Based Harvesters with a Machine Control System ». Forests 10, n^o 1 (9 janvier 2019) : 43. http://dx.doi.org/10.3390/f10010043.

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Compared with purpose-built units, excavator-based harvesters offer many advantages, but they also face one main limitation: a much higher fuel consumption, which also results in higher CO2 emission levels. The fuel efficiency of excavator-based harvesters can be increased by a better interface between the excavator and the harvester head. This study aimed to determine the performance of a new adaptation kit, specifically designed to improve the communication between these two components. The new kit offers real-time adjustment between the power demand of the harvester head and the power output of the excavator, which should help reducing fuel consumption while stabilizing hydraulic fluid temperature. The test was conducted on 53 excavator-based harvesters purchased and managed by a large Brazilian company. Time use, fuel consumption and production were monitored continuously for one full month, before and after installation of the kit. Overall, the study covered 40,000 h of work, during which the harvesters cut, processed, and debarked 4.5 million trees, or 650,000 m3 of wood, under bark. Fuel consumption amounted to 900,000 liters. After installing the adaptation kit, productivity increased 6%, while fuel consumption per hour decreased 3.5%. Fuel consumption and CO2 emissions per product unit decreased 10%, as an average. The effect of random variability typical of an observational study prevented formulating an accurate figure for the amount of fuel that can be saved by installing the adaptation kit. Yet, one may confidently state that, in most cases, installing the kit results in a reduction of fuel use, and that such reduction is most often in the range from −10 to −20% on a per m3 basis.

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Xia, Xiang, Hongcui Li, Wenyi Wu, Yanhua Li, Dehou Fei, Chunxiao Gao et Xizhe Liu. « Efficient Light Harvester Layer Prepared by Solid/Mist Interface Reaction for Perovskite Solar Cells ». ACS Applied Materials & ; Interfaces 7, n^o 31 (3 août 2015) : 16907–12. http://dx.doi.org/10.1021/acsami.5b04563.

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Bu, L., H. Y. Xu, B. J. Xu et L. Song. « Micro-fabricated Liquid Encapsulated Energy Harvester with Polymer Barrier Layer as Liquid Electret Interface ». Journal of Physics : Conference Series 557 (27 novembre 2014) : 012036. http://dx.doi.org/10.1088/1742-6596/557/1/012036.

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Li, Kankan, Xuefeng He, Xingchang Wang et Senlin Jiang. « A Nonlinear Electromagnetic Energy Harvesting System for Self-Powered Wireless Sensor Nodes ». Journal of Sensor and Actuator Networks 8, n^o 1 (12 mars 2019) : 18. http://dx.doi.org/10.3390/jsan8010018.

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The Internet of things requires long-life wireless sensor nodes powered by the harvested energy from environments. This paper proposes a nonlinear electromagnetic energy harvesting system which may be used to construct fully self-powered wireless sensor nodes. Based on a nonlinear electromagnetic energy harvester (EMEH) with high output voltage, the model of a nonlinear interface circuit is derived and a power management circuit (PMC) is designed. The proposed PMC uses a buck–boost direct current-direct current (DC–DC) converter to match the load resistance of the nonlinear interface circuit. It includes two open-loop branches, which is beneficial to the optimization of the impedance matching. The circuit is able to work even if the stored energy is completely drained. The energy harvesting system successfully powered a wireless sensor node. Experimental results show that, under base excitations of 0.3 g and 0.4 g (where 1 g = 9.8 m·s−2) at 8 Hz, the charging efficiencies of the proposed circuit are 172% and 28.5% higher than that of the classic standard energy-harvesting (SEH) circuit. The experimental efficiency of the PMC is 41.7% under an excitation of 0.3 g at 8 Hz.

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Clemente, Carmine Stefano, Immacolato Iannone, Vincenzo Paolo Loschiavo et Daniele Davino. « Design and Optimization of a Boost Interface for Magnetostrictive Energy Harvesting ». Applied Sciences 13, n^o 3 (27 janvier 2023) : 1606. http://dx.doi.org/10.3390/app13031606.

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Magnetostrictive alloys are very promising for Vibration Energy Harvesting applications to supply power to Wireless Sensor Network (WSN) and Internet of Things (IoT) devices, especially because of their intrinsic robustness. Typically, vibration energy sources are random in nature, usually providing exploitable voltages much lower than the electronic standards 1.6, 3.3 and 5 V. Therefore, a Power Electronic Interface (PEI) is needed to improve the conversion to DC output voltage from AC input over a wide range of frequencies and amplitudes. Very few or no conversion techniques are available for magnetostrictive devices, although several have been presented over the years for other smart materials, such as piezoelectrics. For example, hybrid buck–boost converters for piezoelectrics use one or more external inductors with a high-frequency switching technique. However, because of the intrinsic nature of harvesters based on magnetostrictive materials, such energy conversion techniques are proved to be neither efficient nor applicable. An improved AC–DC boost converter seems very promising for our purpose instead. The key feature is represented by the direct exploitation of the active harvester coil as a storage element of the boost circuit, without using other passive inductors as in other switching methods. Experimental tests of such a converter, driven with a real-time operating Arduino controller to detect the polarity of the input voltage, are presented with the aim to assess the potentiality of the scheme with both sinusoidal and impulse-like inputs. Simulations have been performed with LTspice, and the performance and efficiency have been compared with other energy conversion techniques.

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Hu, Guobiao, Lihua Tang, Junrui Liang et Raj Das. « Modelling of a cantilevered energy harvester with partial piezoelectric coverage and shunted to practical interface circuits ». Journal of Intelligent Material Systems and Structures 30, n^o 13 (19 mai 2019) : 1896–912. http://dx.doi.org/10.1177/1045389x19849269.

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This article presents a modelling methodology for a cantilevered energy harvester with partial piezoelectric coverage and shunted to practical power conditioning interface circuits. First, the distributed parameter model of the partially covered piezoelectric energy harvester is developed and the associated analytical solution is derived. Subsequently, the single-degree-of-freedom representation model is developed and the explicit expressions of equivalent lumped parameters are derived by taking the static deflection as the approximated fundamental vibration mode. Based on the comparison with the single-mode expression of the distributed parameter model, a correction factor is proposed to improve the accuracy of the single-degree-of-freedom model. The results of both the distributed parameter and the corrected single-degree-of-freedom models are compared. The accuracy of the corrected single-degree-of-freedom representation model is verified against the analytical and the finite element models. Finally, practical interface circuits including the standard energy harvesting circuit and the parallel synchronized switch harvesting on inductor circuit are considered. A modified equivalent impedance modelling method is proposed for the analysis of the standard energy harvesting and parallel synchronized switch harvesting on inductor circuits. The results of the modified equivalent impedance modelling method are verified against the existing method in the literature.

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Khosro Pour, Naser, François Krummenacher et Maher Kayal. « Fully Integrated Solar Energy Harvester and Sensor Interface Circuits for Energy-Efficient Wireless Sensing Applications ». Journal of Low Power Electronics and Applications 3, n^o 1 (28 février 2013) : 9–26. http://dx.doi.org/10.3390/jlpea3010009.

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ASANUMA, Haruhiko, Shun OSUGI, Toshihiko KOMATSUZAKI et Yoshio IWATA. « High Performance Miniature Piezoelectric Vibration Energy Harvester by Combining Folded Spring and Mechanically-switching Interface ». Proceedings of Mechanical Engineering Congress, Japan 2016 (2016) : G1000206. http://dx.doi.org/10.1299/jsmemecj.2016.g1000206.

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Li, Kaiyuan, et Piervincenzo Rizzo. « Experimental parametric analysis of an energy harvester based on highly nonlinear solitary waves ». Journal of Intelligent Material Systems and Structures 28, n^o 6 (28 juillet 2016) : 772–81. http://dx.doi.org/10.1177/1045389x16657422.

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We investigate experimentally five different designs of an energy harvester based on mechanical vibration and highly nonlinear solitary waves. The harvester consists of a metamaterial formed by granular chains, an oscillator that taps the metamaterial, a solid in contact with the metamaterial, and a piezoelectric element glued to the solid. The overall principle is that the oscillator taps the metamaterial and creates a train of solitary waves along each chain. At the interface between the chains and the solid, part of the acoustic energy refracts into the solid where it coalesces at a point and triggers the vibration of the solid. Here, a transducer converts the focalized stress wave and the waves generated by the reverberation with the edges into electric potential. In the study presented in this article, we evaluate the effect of certain harvester parameters on the amount of energy that can be extracted. We considered five different designs by changing the oscillator, the dimension of the array, the solid material, and the transducer boundary condition. For each design we computed the power density, and we found that the density obtained with the best design is four orders of magnitude higher than the worst design.

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Jia, Jinda, Xiaobiao Shan, Xingxu Zhang, Tao Xie et Yaowen Yang. « Equivalent circuit modeling and analysis of aerodynamic vortex-induced piezoelectric energy harvesting ». Smart Materials and Structures 31, n^o 3 (31 janvier 2022) : 035009. http://dx.doi.org/10.1088/1361-665x/ac4ab4.

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Abstract Low-speed wind energy has potential to be captured for powering micro-electro-mechanical systems or sensors in remote inaccessible place by piezoelectric energy harvesting from vortex-induced vibration. Conventional theory or finite-element analysis mostly considers a simple pure resistance as interface circuit because of the complex fluid-solid-electricity coupling in aeroelastic piezoelectric energy harvesting. However, the output alternating voltage should be rectified to direct voltage to be used in practical occasions, where the theoretical analysis and finite-element analysis for complex interface may be cumbersome or difficult. To solve this problem, this paper presents an equivalent circuit modeling (ECM) method to analyze the performance of vortex-induced energy harvesters. Firstly, the equivalent analogies from the mechanical and fluid domain to the electrical domain are built. The linear mechanical and fluid elements are represented by standard electrical elements. The nonlinear elements are represented by electrical non-standard user-defined components. Secondly, the total fluid-solid-electricity coupled mathematical equations of the harvesting system are transformed into electrical formulations based on the equivalent analogies. Finally, the entire ECM is established in a circuit simulation software to perform system-level transient analyses. The simulation results from ECM have good agreement with the experimental measurements. Further parametric studies are carried out to assess the influences of wind speed and resistance on the output power of the alternating circuit interface and the capacitor filter circuit. At wind speed of 1.2 m s−1, the energy harvester could generate an output power of 81.71 μW with the capacitor filter circuit and 114.64 μW with the alternating circuit interface. The filter capacitance is further studied to ascertain its effects on the stability of output and the settling time.

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Haidar, Mohammad, Hussein Chible, Corrado Boragno et Daniele D. Caviglia. « A Low Power AC/DC Interface for Wind-Powered Sensor Nodes ». Energies 14, n^o 7 (25 mars 2021) : 1823. http://dx.doi.org/10.3390/en14071823.

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Sensor nodes have been assigned a lot of tasks in a connected environment that is growing rapidly. The power supply remains a challenge that is not answered convincingly. Energy harvesting is an emerging solution that is being studied to integrate in low power applications such as internet of things (IoT) and wireless sensor networks (WSN). In this work an interface circuit for a novel fluttering wind energy harvester is presented. The system consists of a switching converter controlled by a low power microcontroller. Optimization techniques on the hardware and software level have been implemented, and a prototype is developed for testing. Experiments have been done with generated input signals resulting in up to 67% efficiency for a constant voltage input. Other experiments were conducted in a wind tunnel that showed a transient output that is compatible with the target applications.

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R. Sarke, Mahidur. « Design and implementation of an energy harvester interface circuit using ultra-low power piezo bending generator ». International Journal of Advanced Trends in Computer Science and Engineering 9, n^o 1.4 (15 septembre 2020) : 49–58. http://dx.doi.org/10.30534/ijatcse/2020/0891.42020.

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Bedier, Mohammed, et Dimitri Galayko. « A 100nW Power Overhead Load Interface for Electrostatic Vibrational Energy Harvester with a High Biasing Voltage ». Procedia Engineering 168 (2016) : 1693–97. http://dx.doi.org/10.1016/j.proeng.2016.11.492.

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Lu, Han, Kairui Chen, Hao Tang et Weiqun Liu. « Comparison of Four Electrical Interfacing Circuits in Frequency Up-Conversion Piezoelectric Energy Harvesting ». Micromachines 13, n^o 10 (26 septembre 2022) : 1596. http://dx.doi.org/10.3390/mi13101596.

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Efficiently scavenging piezoelectric vibration energy is attracting a lot of interest. One important type is the frequency up-conversion (FUC) energy harvester, in which a low-frequency beam (LFB) impacts a high-frequency beam (HFB). In this paper, four interface circuits, standard energy harvesting (SEH), self-powered synchronous electric charge extraction (SP-SECE), self-powered synchronized switch harvesting on inductor (SP-SSHI) and self-powered optimized SECE (SP-OSECE), are compared while rectifying the generated piezoelectric voltage. The efficiencies of the four circuits are firstly tested at constant displacement and further analyzed. Furthermore, the harvested power under FUC is tested for different electromechanical couplings and different load values. The results show that SP-OSECE performs best in the case of a weak coupling or low-load resistance, for which the maximum power can be 43% higher than that of SEH. As the coupling level increases, SP-SSHI becomes the most efficient circuit with a 31% higher maximum power compared to that of SEH. The reasons for the variations in each circuit with different coupling coefficients are also analyzed.

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Li, Yani, Zhangming Zhu, Yintang Yang, Yadong Sun et Xu Wang. « A Novel Interface Circuit with 99.2% MPPT Accuracy and 1.3% THD for Energy Harvesting ». Journal of Circuits, Systems and Computers 26, n^o 11 (28 mars 2017) : 1750176. http://dx.doi.org/10.1142/s0218126617501766.

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To improve conversion efficiency and output quality of the energy harvester, a novel interface circuit with composite maximum power point tracking (MPPT) in energy harvesting applications is proposed in this paper. By using the ultra-low-voltage multiplier with digital control and simple one-cycle variable frequency technique, the converter realizes fast power tracking and high conversion efficiency, and minimizes the power consumption and harmonics, thereby obtaining high tracking precise and low total harmonic distortion (THD). Implemented in 65-nm CMOS process, this converter achieves 85.9% peak power efficiency with dc output voltage of 1.6[Formula: see text]V. The peak tracking efficiency and THD are 99.2% and 1.3%, respectively. The peak output power is 18.31[Formula: see text][Formula: see text]W, and the power loss of the entire converter is only 16.53[Formula: see text][Formula: see text]W.

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Grupioni, Christina Maria de Freitas, Fábio Lúcio Santos, Haroldo Carlos Fernandes, Domingos Sarvio Magalhães Valente et Francisco De Assis de Carvalho Pinto. « Development and evaluation of operational performance of macaw fruits semi-mechanized harvester by means mechanical vibrations principle ». Semina : Ciências Agrárias 39, n^o 2 (15 mars 2018) : 497. http://dx.doi.org/10.5433/1679-0359.2018v39n2p497.

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Macaw (Acrocomia aculeata) is a product of Brazilian socio-biodiversity and is an excellent source of oil for the cosmetics, food and fuel industry. One of the technical bottlenecks of macaw fruit production is the manual harvesting with rudimentary tools and the extractive system, which has a very large dependence on labor. The objective of this work was to develop the informational and conceptual design of a semi-mechanized harvesting system that can be used in adverse conditions of relief, also directed to the needs of family farmers. In this work the concept of a low cost macaw harvester is proposed, which works by the principle of mechanical vibrations, and is able to work efficiently in planted and natural plantations. From an adaptation of the Pahl and Beitz method for the development of machine designs, and the use of the evolution prototyping method, integration prototypes were constructed, which underwent a preliminary field test. Some modifications were made in portable coffee breakers, which constituted changes in the vibration signal generation system that were transmitted to macaw fruits at the head / plant interface. Only one of the built prototypes was considered effective and suitable for subsequent performance (product under patent registration). For the detailed design, CAD (Computer Aided Design) techniques were employed. Later, it was possible to observe the validation of efficiency of the macaw fruit harvest by the principle of mechanical vibrations. Under field conditions, field trials demonstrated that the average harvest efficiency for the proposed model with vibrating rods was 97.4% and the average harvesting capacity was 566.91 kg h-1.

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Li, Zhaoyu, Lihua Tang, Weiqing Yang, Renda Zhao, Kefu Liu et Brian Mace. « Transient response of a nonlinear energy sink based piezoelectric vibration energy harvester coupled to a synchronized charge extraction interface ». Nano Energy 87 (septembre 2021) : 106179. http://dx.doi.org/10.1016/j.nanoen.2021.106179.

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Dudka, A., P. Basset, F. Cottone, E. Blokhina et D. Galayko. « Wideband Electrostatic Vibration Energy Harvester (e-VEH) Having a Low Start-Up Voltage Employing a High-Voltage Integrated Interface ». Journal of Physics : Conference Series 476 (4 décembre 2013) : 012127. http://dx.doi.org/10.1088/1742-6596/476/1/012127.

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Xiao, Huifang, Haotang Qie et Chris R. Bowen. « Modelling of the circular edge-clamped interface of a hydraulic pressure energy harvester to determine power, efficiency and bandwidth ». Mechanical Systems and Signal Processing 146 (janvier 2021) : 107013. http://dx.doi.org/10.1016/j.ymssp.2020.107013.

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Liang, Zhenwei, Yaoming Li et Lizhang Xu. « Grain Sieve Loss Fuzzy Control System in Rice Combine Harvesters ». Applied Sciences 9, n^o 1 (29 décembre 2018) : 114. http://dx.doi.org/10.3390/app9010114.

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The main working parts of the cleaning device of a rice combine harvester can be controlled by an established control strategy in real time based on the monitored grain sieve loss. This is an efficient way to improve their cleaning adaptability, since as a consequence, the main working parameters of combine harvesters can automatically adapt to crop and environment changes, and the corresponding cleaning performance can be improved. To achieve the target of cleaning control based on the monitored grain sieve loss, a fuzzy control system was developed, which selected S7-1200 PLC as the main control unit to build the lower computer hardware system, utilized ladder language to complete the system compilation, and used LabVIEW 14.0 software to design the host–computer interface. The effects of fan speed, guide plate angle, and sieve opening on the grain sieve loss and grain impurity ratio have been investigated through a large number of bench tests. The relevance level of the operating parameters on the performance parameters has been determined also, and finally, a fuzzy control model was developed for the cleaning system. The experiment results indicated that the designed fuzzy control model can control the cleaning section settings, such as fan speed and guide plate angle automatically, and reduce the grain sieve loss to some extent.

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Lu, Yongling, Zhen Wang, Xueqiong Zhu, Chengbo Hu, Jinggang Yang et Yipeng Wu. « Vibration Energy Harvesting from the Subwavelength Interface State of a Topological Metamaterial Beam ». Micromachines 13, n^o 6 (30 mai 2022) : 862. http://dx.doi.org/10.3390/mi13060862.

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Topological metamaterial has been a research hotpot in both physics and engineering due to its unique ability of wave manipulation. The topological interface state, which can efficiently and robustly centralize the elastic wave energy, is promising to attain high-performance energy harvesting. Since most of environmental vibration energy is in low frequency range, the interface state is required to be designed at subwavelength range. To this end, this paper developed a topological metamaterial beam with local resonators and studied its energy-harvesting performance. First, the unit cell of this topological metamaterial beam consists of a host beam with two pairs of parasitic beams with tip mass. Then, the band structure and topological features are determined. It is revealed that by tuning the distance between these two pairs of parasitic beams, band inversion where topological features inverse can be obtained. Then, two sub-chains, their design based on two topologically distinct unit cells, are assembled together with a piezoelectric transducer placed at the conjunction, yielding the locally resonant, topological, metamaterial, beam-based piezoelectric energy harvester. After that, its transmittance property and output power were obtained by using the frequency domain analysis of COMSOL Multiphysics. It is clear that the subwavelength interface state is obtained at the band-folding bandgap. Meanwhile, in the interface state, elastic wave energy is successfully centralized at the conjunction. From the response distribution, it is found that the maximum response takes place on the parasitic beam rather than the host beam. Therefore, the piezoelectric transducer is recommended to be placed on the parasitic beam rather than host beam. Finally, the robustness of the topological interface state and its potential advantages on energy harvesting were studied by introducing a local defect. It is clear that in the interface state, the maximum response is always located at the conjunction regardless of the defect degree and location. In other words, the piezoelectric transducer placed at the conjunction can maintain a stable and high-efficiency output power in the interface state, which makes the whole system very reliable in practical implementation.

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Hu, Yuantai, Huan Xue, Ting Hu et Hongping Hu. « Nonlinear interface between the piezoelectric harvesting structure and the modulating circuit of an energy harvester with a real storage battery ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 55, n^o 1 (janvier 2008) : 148–60. http://dx.doi.org/10.1109/tuffc.2008.624.

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Giuliano, Alessandro, et Meiling Zhu. « A Passive Impedance Matching Interface Using a PC Permalloy Coil for Practically Enhanced Piezoelectric Energy Harvester Performance at Low Frequency ». IEEE Sensors Journal 14, n^o 8 (août 2014) : 2773–81. http://dx.doi.org/10.1109/jsen.2014.2316091.

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Du, Sijun, Yu Jia et Ashwin A. Seshia. « Piezoelectric vibration energy harvesting : A connection configuration scheme to increase operational range and output power ». Journal of Intelligent Material Systems and Structures 28, n^o 14 (12 décembre 2016) : 1905–15. http://dx.doi.org/10.1177/1045389x16682846.

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For a conventional monolithic piezoelectric transducer (PT) using a full-bridge rectifier, there is a threshold voltage that the open-circuit voltage measured across the PT must attain prior to any transfer of energy to the storage capacitor at the output of the rectifier. This threshold voltage usually depends on the voltage of the storage capacitor and the forward voltage drop of diodes. This article presents a scheme of splitting the electrode of a monolithic piezoelectric vibration energy harvester into multiple ( n) equal regions connected in series in order to provide a wider operating voltage range and higher output power while using a full-bridge rectifier as the interface circuit. The performance of different series stage numbers has been theoretically studied and experimentally validated. The number of series stages ([Formula: see text]) can be predefined for a particular implementation, which depends on the specified operating conditions, to achieve optimal performance. This enables the system to attain comparable performance compared to active interface circuits under an increased input range while no additional active circuits are required and the system is comparatively less affected by synchronized switching damping effect.

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Zhao, Sheng, Ujwal Radhakrishna, Jeffrey H. Lang et Dennis Buss. « Low-voltage broadband piezoelectric vibration energy harvesting enabled by a highly-coupled harvester and tunable PSSHI circuit ». Smart Materials and Structures 30, n^o 12 (12 novembre 2021) : 125030. http://dx.doi.org/10.1088/1361-665x/ac3402.

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Abstract This paper presents a system-level design approach for widening the bandwidth and lowering the operating voltage of a piezoelectric vibration energy harvesting system (PVEHS). The proposed strategy involves co-optimization of the two constituent parts: (1) a highly-coupled piezoelectric vibration energy harvesting device (PVEHD) and (2) a phase-shift tunable parallel-SSHI (PS-PSSHI) interface power-electronic circuit. First, we analyze the interaction between them to achieve an overall reduction of system voltage and to widen bandwidth. Next, a co-designed system is experimentally demonstrated to validate the analysis. The implemented PVEHS consists of (i) a customized PVEHD designed for high electromechanical coupling and well-separated short-circuit (f SC) and open-circuit (f OC) resonances, and (ii) a tunable PS-PSSHI circuit which has an active rectification with low voltage drop to increase system efficiency. The system achieves an output power of 148 µW with a bandwidth of 81 Hz, an increase of 337% compared to conventional full-bridge rectifier. In addition, the system rectification voltage is lowered by 30% which makes it viable to power low-voltage Internet-of-Things sensor nodes.

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