Harvesting aware power management for sensor networks
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Telos: enabling ultra-low power wireless research
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Design considerations for solar energy harvesting wireless embedded systems
IPSN '05 Proceedings of the 4th international symposium on Information processing in sensor networks
Perpetual environmentally powered sensor networks
IPSN '05 Proceedings of the 4th international symposium on Information processing in sensor networks
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Adaptive power management in energy harvesting systems
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Real-time scheduling for energy harvesting sensor nodes
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An efficient solar energy harvester for wireless sensor nodes
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ACM Journal on Emerging Technologies in Computing Systems (JETC)
An energy management framework for energy harvesting embedded systems
ACM Journal on Emerging Technologies in Computing Systems (JETC)
Maximum power transfer tracking for a photovoltaic-supercapacitor energy system
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Proceedings of the 16th ACM/IEEE international symposium on Low power electronics and design
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Proceedings of the 17th IEEE/ACM international symposium on Low-power electronics and design
Energy harvesting by sweeping voltage-escalated charging of a reconfigurable supercapacitor array
Proceedings of the 17th IEEE/ACM international symposium on Low-power electronics and design
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Harvesting-aware power management for real-time systems with renewable energy
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
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Proceedings of the 1st International Workshop on Energy Neutral Sensing Systems
GreenCastalia: an energy-harvesting-enabled framework for the Castalia simulator
Proceedings of the 1st International Workshop on Energy Neutral Sensing Systems
Analog Integrated Circuits and Signal Processing
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The limited battery lifetime of modern embedded systems and mobile devices necessitates frequent battery recharging or replacement. Solar energy and small-size photovoltaic (PV) systems are attractive solutions to increase the autonomy of embedded and personal devices attempting to achieve perpetual operation. We present a batteryless solar-harvesting circuit that is tailored to the needs of low-power applications. The harvester performs maximum-power-point tracking of solar energy collection under nonstationary light conditions, with high efficiency and low energy cost exploiting miniaturized PV modules. We characterize the performance of the circuit by means of simulation and extensive testing under various charging and discharging conditions. Much attention has been given to identify the power losses of the different circuit components. Results show that our system can achieve low power consumption with increased efficiency and cheap implementation. We discuss how the scavenger improves upon state-of-the-art technology with a measured power consumption of less than 1 mW. We obtain increments of global efficiency up to 80%, diverging from ideality by less than 10%. Moreover, we analyze the behavior of supercapacitors. We find that the voltage across the supercapacitor may be an unreliable indicator for the stored energy under some circumstances, and this should be taken into account when energy management policies are used.