Wi tricity(2)
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Wi tricity(2)

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Witricity is the new electricity

Witricity is the new electricity

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  • One major limitation in WSN is the lifetime of the node’s battery. AIM: To overcome the power constraint in WSN by wirelessly charging the nodes using a newly discovered technique for single hop wireless energy transfer called Witricity.
  • The investigated design consists of two copper coils, each a self-resonant system. One of the coils, attached to the power source, is the sending unit. Instead of irradiating the environment with electromagnetic waves, it fills the space around it with a nonradiative magnetic field oscillating at MHz frequencies. The non-radiative field mediates the power exchange with the other coil (the receiving unit), which is specially designed to resonate with the field. The resonant nature of the process ensures the strong interaction between the sending unit and the receiving unit, while the interaction with the rest of the environment is weak.
  • Integrating Witricity into WSN requires considering multi-hop wireless energy transfer since most nodes are several hops away from the base station. three new techniques for multi-hop wireless energy transfer

Wi tricity(2) Wi tricity(2) Presentation Transcript

  • WITRICITY THE ROAD TO IMMORTAL SENSOR NODES BY, SMITA RAO
  • INTRODUCTION
    • WiTricity - The wireless electricity.
    • Usage of two copper coils, each a self-resonant system.
  • WHAT IS WITRICITY?
    • A system of two electromagnetic resonators coupled mostly through their magnetic fields.
    • Efficient power transfer.
  • SENSOR NODES
    • Energy constraints.
    • Wirelessly transfer energy between nodes at mid ranges (1-3 meters).
    • Overcome the power constraint in WSN by constantly charging the nodes.
  • REQUIREMENTS FOR INTEGRATING WITRICITY INTO WSN
    • New techniques for multi-hop wireless energy transfer.
    • The hardware a sensor node needs in order to wirelessly transmit and receive energy
    • A charging protocol for a WSN with flat topology and another for a WSN with clustered topology.
  • STORE AND FORWARD TECHNIQUE
    • Each node on the path from the source to the destination node receives the energy and stores it in its battery. It then forwards the energy to the next node on the path. At every hop, two nodes couple together independent of other nodes in the network.
  • DIRECT FLOW TECHNIQUE
    • Each node couples with previous and following nodes on the path from the source node to the destination node. Once this node receives the energy from the previous node, it directly transmits it to the following node without storing it in its battery.
    • Advantage - A single device can couple with multiple devices at the same time.
  • HYBRID TECHNIQUE
    • Uses a combination of both the store and forward and the virtual circuit technique.
    • Energy is transferred using the direct flow technique for a small number of hops M and then it is stored at the Mth node. It is then forwarded to the next Mth node again using direct flow technique. So if we want to transfer energy over N hops, we can divide the energy transfer over k direct flow transmissions, each of M hops with N=k*M.
  • HARDWARE OF THE IMMORTAL SENSOR NODE
  • CHARGING PROTOCOL
    • Multi-hop wireless energy transfer in WSN examined under two topologies:
    • 1. Flat topology
    • 2. Clustered topology
    • Can every node in the network be charged?
  • CHARGING ALGORITHM FOR A FLAT TOPOLOGY
    • All packets start with the type and the ID of the node sending the message.
    • (a) Request to charge message
    • (b) Accept to charge message
    • (c) Confirm to charge message
    • (d) Start to charge message
    • (e) No to charge message
    CONTROL PACKETS FOR FLAT TOPOLOGY CHARGING PROTOCOL
  • CHARGING PROTOCOL FOR CLUSTERED TOPOLOGY
    • (a) Requesting node sends RTC to cluster head which forwards RTC to all other nodes in the cluster .
    • (b) Servicing node sends ATC to cluster head which sends it to the requesting node.
    • (c) Requesting node sends CTC to involved node. The involved nodes reply by a STC .
    • (d) Energy is transferred through the cluster head in the first case and directly in the second case.
  • FUTURE WITH WITRICITY
    • Easier to implement WiTricity in a WSN.
    • Overcome power constraint in WSN.
    • No need of power cables and batteries .
    • Contradictions to the concept
        • Risky living next to power lines ?
        • Low power WiTricity network running in the home ?
  • CONCLUSION
    • The future of electricity is Witricity.
    • Freedom from dangling cables and batteries.
  • BIBLIOGRAPHY
    • IEEE PAPERS REFFERED:
      •   WiTricity by Gozalvez, J. 
      • The road to immortal sensor nodes Watfa, M.K.   Al-Hassanieh, H.   Salmen, S.   Comput. Sci. Dept., Univ. of Wollongong, Dubai; This paper appears in: Intelligent Sensors, Sensor Networks and Information Processing, 2008. ISSNIP 2008. International Conference on Publication Date: 15-18 Dec. 2008
    • http://www.witricitypower.com/index.html
    • http://news.bbc.co.uk/2/hi/technology/6725955.stm
    • http://www.articlehome.net/pdf/article-116359.pdf
  • THANK YOU!
  • ANY QUESTIONS