christmann-async10

christmann-async10 - 2010 IEEE Symposium on Asynchronous...

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Bringing Robustness and Power Efficiency to Autonomous Energy Harvesting Microsystems J.F. Christmann (1) , E. Beigné (1) , C. Condemine (1) , N. Leblond (2) , P. Vivet (1) , G. Waltisperger (1) , J. Willemin (1) (1) MINATEC - CEA/LETI 17 rue des Martyrs 38054 Grenoble Cedex 9 - France {jean-frederic.christmann, edith.beigne, cyril.condemine, pascal.vivet, guy.waltisperger, jerome.willemin}@cea.fr (2) Tiempo SAS Inovallée - Immeuble Viséo 110 rue Blaise Pascal 38330 Montbonnot St-Martin - France nicolas.leblond@tiempo-ic.com Abstract —Autonomous devices that are self-powered by extracting their energy from their environment are a new opportunity for monitoring purposes. A multi-energy sources and multi-sensors microsystem targeting autonomous wireless sensor node applications is presented. Since the available energy is not constant over time and due to very low harvested power levels, an efficient energy and power management strategy is mandatory. In this paper, we propose to use the benefits of an event-based asynchronous controller to reduce the overall power consumption and bring voltage level robustness to the microsystem. The proposed architecture is energy-driven by detecting environmental energy events which are translated in data events to the controller, implemented in asynchronous logic. The data-driven controller dynamically reconfigures the power paths between sources and sensors to optimize the microsystem power efficiency. Compared to classical harvesting systems proposing a single power path through a battery, our proposal allows up a 40% power efficiency gain. Keywords —Energy harvesting, Microsystem, Power management, Asynchronous controller I. INTRODUCTION Enhancing the battery life or suppressing the battery become today a main issue in autonomous wireless microsystems [1]. A proposed solution is to harvest energy in the environment and to maximize the lifespan of autonomous communicating sensors to avoid any human maintenance need. Autonomous devices that are self-powered over their full lifetime by extracting their energy from the environment are crucial for applications such as ambient intelligence, active security or monitoring purposes [2][3]. In such devices and application, as the energy availability and power dissipation are not constant over time, energy management becomes a key function and determines the potential for information processing. Moreover, due to the scavengers technologies [4][5], average harvested power and energy is extremely low. Energy autonomy is not a new research topic. In 1956, and 1975, first autonomous TV remote control [6] and thermoelectric watch [7] have been proposed. Those first realizations have initiated the research on new autonomous devices in many application fields like harvesters and sensors new architectures. Therefore, today, to reach an ultra low power autonomous microsystem, several issues must be solved.
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christmann-async10 - 2010 IEEE Symposium on Asynchronous...

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