Self-Powered Adaptive Switched Architecture Storage

[摘要] Ambient energy harvesting coupled to storage is a way to improve the autonomy of wireless sensors networks. Moreover, in some applications with harsh environment or when a long service lifetime is required, the use of batteries is prohibited. Ultra-capacitors provide in this case a good alternative for energy storage. Such storage must comply with the following requirements: a sufficient voltage during the initial charge must be rapidly reached, a significant amount of energy should be stored and the unemployed residual energy must be minimised at discharge. To answer these apparently contradictory criteria, we propose a selfadaptive switched architecture consisting of a matrix of switched ultra-capacitors. We present the results of a self-powered adaptive prototype that shows the improvement in terms of charge time constant, energy utilization rate and then energy autonomy.

[发布机构] LAAS-CNRS, Université de Toulouse, CNRS, INSA, UPS, Toulouse, France^1;University of Barcelona, Barcelona, Spain^2

[效力级别] 能源学

[关键词] Energy autonomies;Harsh environment;Residual energy;Service lifetime;Switched architecture;Time constants;Ultracapacitors;Wireless sensors networks