mems project report


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Unformatted text preview: PIEZOELECTRIC MICROGENERATOR POWERING THE PACEMAKER Kaushik Illa Krishna Chaitanya Nutukurthi Satya Prasad Akkina #36730160 #36727542 #36561674 Abstract The piezoelectric micro power generator (PMPG) is fabricated with the bio-safe and bio-compatible piezoelectric material ZnO wires. The wireless sensor nodes are to be placed on the motor for monitoring the power flow and other electrical quantities. The energy generated by PMPG can be rectified and this energy is stored by Schottky diode rectifier and custom ANSI circuit. This generated energy from the PMPG is used to power the pacemaker and this product would drive away the need to monitor as well as replace the batteries periodically. 1. Introduction The designing of micro generator is carried out by using ZnO nanowires. This microgenerator is used to power the pacemaker. The microgenerator receives electricity from the pressure of the heartbeat for the use by the battery. Power from the microgenerator is stored in the batteries and is used to power the pacemaker when required. 2. Piezoelectricity Piezoelectricity is a field of science which investigates the ability of certain materials to generate electric potential in response to mechanical stress. More often these materials include crystals, topaz, quartz, etc. Fig 3: Piezoelectric effect The above figure illustrates generation of electricity from mechanical stress on the piezoelectric materials. These piezoelectric domains have interlocking symmetrical domain which gives them a neutral charge. When these materials are compressed Or deformed the symmetry is broken which releases an electric potential. This is determined as piezoelectricity. [1] 3. ZnO Nanowires We have different piezoelectric materials that are used for the designing of the microgenerator. Some of them include Barium titanate, Aluminum nitride, PZT[Pb 1.1 (Zr0.3Ti 0.7 )O 3 ] ZnO etc. The microgenerator that we are designing is for the use in the Pacemaker. Therefore it must be biosafe ad biocompatible so that it does not produce any harm to the body parts. Of the above piezoelectric materials we have ZnO which is bio safe and biocompatible and can be used in the designing of the microgenerator. A schematic view of ZnO nanowires can be seen as shown in the fig 1. Fig 1: ZnO Nanowires 3.1 Advantages of ZnO Nanowires Powering of pacemaker can be done by using micro generator that can be installed in our body. We are trying to demonstrate micro generator generates using ZnO Nanowires. These ZnO nanowires (NWs) can be used to convert mechanical vibrations, into electrical energy. ZnO has the property of piezoelectricity by which, when these are subject to mechanical stress they produce electrical potential on them....
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