An Efficient Solar Energy Harvester for Wireless Sensor Nodes

Brunelli, Davide; Benini, Luca; Moser,; Thiele,

doi:10.1109/date.2008.4484670

Cited by 70 publications

(64 citation statements)

References 10 publications

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“…The PV module is maintained at this fixed voltage, which is provided by the HELD_SAMPLE line from the sample-and-hold circuit. It was designed and optimised in line with earlier reported works such as [5], [8] but was forced to use an alternative PV cell model as described in Sec. II.…”

Section: A Overall System Operationmentioning

confidence: 99%

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Ultra low-power photovoltaic MPPT technique for indoor and outdoor wireless sensor nodes

Weddell

Merrett

Al-Hashimi

2011

2011 Design, Automation &Amp; Test in Europe

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Abstract-Photovoltaic (PV) energy harvesting is commonly used to power wireless sensor nodes. To optimise harvesting efficiency, maximum power point tracking (MPPT) techniques are often used. Recently-reported techniques focus solely on outdoor applications, being too power-hungry for use under indoor lighting. Additionally, some techniques have required light sensors (or pilot cells) to control their operating point. This paper describes an ultra low-power MPPT technique which is based on a novel system design and sample-and-hold arrangement, which enables MPPT across the range of light intensities found indoors and outdoors and is capable of cold-starting. The proposed sample-and-hold based technique has been validated through a prototype system. Its performance compares favourably against state-of-the-art systems, and does not require an additional pilot cell or photodiode. This represents an important contribution, in particular for sensors which may be exposed to different types of lighting (such as body-worn or mobile sensors).

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Section: A Overall System Operationmentioning

confidence: 99%

“…Existing state-of-the-art small systems (i.e. with small PV cells but designed for outdoor use) have used a 'pilot' solar cell [5] (for which the overall system consumes ≈ 300µW when 'off') or photodetector [6] (which consumes ≈ 500µA) to control the operating point of the module.…”

Section: Introductionmentioning

confidence: 99%

Ultra low-power photovoltaic MPPT technique for indoor and outdoor wireless sensor nodes

Weddell

Merrett

Al-Hashimi

2011

2011 Design, Automation &Amp; Test in Europe

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“…Quickly charging (large u k ), increases the bandwidth, decreasing prediction uncertainty for branches that do not react to abrupt charging. Formulating Q k and R k from the continuous random I noise signal is done by applying the linear approximation (6) recursively to the noise signal N times within the interval Δt k :…”

Section: Extended Kalman Filtermentioning

confidence: 99%

“…This superior power density has been utilized for regenerative breaking [1], elevator [2], and automating starting systems for combustion engines [3]. Supercapacitors can also provide sufficient energy density (e.g., Maxwell 3000F [4] with a storage capacity of 11,000 Joules) for deployment in field sysThis work was supported in part by the National Science Foundation grant CNS-1239423 and a gift from Nvidia Corp. tems demanding much lower power consumption levels (e.g., 10 mW-10 W [5,6]). For these systems, where energy is at a premium, being able to predict the remaining energy (i.e., time-to-full-depletion) plays an extremely important role for operational efficiency.…”

Section: Introductionmentioning

confidence: 99%

State-of-charge estimation for supercapacitors: A Kalman filtering formulation

Nadeau

Sharma

Soyata

2014

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Supercapacitors are an attractive option for energy buffering because of their high efficiency, durability, and low environmental impact. For energy-aware applications, it is desirable to accurately estimate the buffered energy. Under conditions of varying energy supply and demand, estimation of buffered energy by using only the supercapacitor terminal voltage is inaccurate because this does not fully comprehend the physical state of charge. To address this problem, we present a Kalman filtering formulation, using the accepted three-branch circuit model for supercapacitors. Compared with an ideal capacitor, the physically-motivated three-branch model provides a much more accurate representation of the state of charge via three internal state voltages associated with short, medium, and long term charging constants. The proposed Kalman formulation tracks these unobservable internal states. This methodology demonstrates a significantly more accurate estimate of the buffered energy as compared with the alternative models of ideal capacitance or a recursive computation of the stored energy. Simulations conducted with variations that approximate recorded solar intensity profiles, our proposed approach has an error of 1% compared with 31% and 85% for the respective alternative models.Index Terms-supercapacitor, ultracapacitor, electric double layer capacitor, solar energy, kalman filter, state of charge, energy awareness.

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“…Later, the concept of power harvesting was explained as a technique for retrieving the energy from the external environment [10] using different resources. This technique promises tremendous scope for the replacement of small batteries in low power electrical devices and systems [10].…”

Section: Introductionmentioning

confidence: 99%

A Plasmonic Monopole Antenna Array on Flexible Photovoltaic Panels for Further Use of the Green Energy Harvesting

Al-Adhami¹,

Erçelebi²

2018

PIER M

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Abstract-Due to urgent needs for exploring new energy resources, a novel approach is developed in this paper to integrate the functions of a photovoltaic (PV) panel with an ultra-wide band (UWB) antenna array as a unit for collecting solar energy and RF radiation power. The UWB antenna is printed on the front panel of the PV surface. The antenna structure is customized with minimum shadowing effects on the PV surface, by using eight monopoles connected to one SMA port as a single antenna array. Then, to ensure the bandwidth enhancement, each monopole is coupled to three Split Ring Resonators (SRR) structured in a single column as a matching circuit. Next, an experimental study is performed to investigate the amount of the harvested energy from both the PV and the antenna array. The antenna experimental measurements are conducted to realize the I-V characteristics for the PV and produced output voltage and efficiency from the RF radiation power at 900 MHz only. Numerically, the proposed antenna array performance is simulated by CST MWS and HFSS software packages. Finally, the antenna performance in terms of S 11 and the radiation pattern at 900 MHz are measured and compared to the simulated results to end up with excellent agreements.

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An Efficient Solar Energy Harvester for Wireless Sensor Nodes

Cited by 70 publications

References 10 publications

Ultra low-power photovoltaic MPPT technique for indoor and outdoor wireless sensor nodes

Ultra low-power photovoltaic MPPT technique for indoor and outdoor wireless sensor nodes

State-of-charge estimation for supercapacitors: A Kalman filtering formulation

A Plasmonic Monopole Antenna Array on Flexible Photovoltaic Panels for Further Use of the Green Energy Harvesting

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