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Passive DC-DC Conversion Technique for Vibration Environments and its Application in RFID Systems

Ravilla, Sree Kalyan (2011) Passive DC-DC Conversion Technique for Vibration Environments and its Application in RFID Systems. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

DC-DC conversion circuits are implemented in several electronic devices to achieve higher power densities. The switched mode DC-DC converters are known for their higher power conversion efficiencies and can transform the energy stored in the passive elements to higher voltage levels than the input voltage (boost converter) or even to lower voltage levels (buck converter) than the input voltage. All the switched mode DC-DC converters use active elements to produce the switching action which consume reasonable amount of power. Hence, the overall power requirement of the device is increased and this would be very critical for low power applications. The active elements can be replaced by passive electromechanical switches which produce electrical switching action by utilizing the energy from the ambient sources. The research work focuses on utilizing the vibrations present in the environment to produce the electrical switching action in passive elements. The new technique proposed adopts the passive motion activated electro-mechanical switch, with a ball bearing making intermittent contacts between the inner conductor and the outer conductor. A conducting path is established when the ball bearing comes in contact with the inner conductor and the outer conductor simultaneously. The passive DC-DC conversion technique is further analyzed by discussing its application in RFID systems which operate on very low power constraints. The improvement in the output voltage levels is proved by comparing the output DC voltage levels generated from the radio frequency signal by employing the DC-DC conversion technique with the voltages obtained without the DC-DC conversion technique.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Ravilla, Sree Kalyansrr32@pitt.edusrr32@pitt.edu
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMickle, Marlin Hmickle@ee.pitt.edumickle@ee.pitt.edu
Committee CoChairStanchina, William Ewstanchina@engr.pitt.eduwstanchina@engr.pitt.edu
Committee MemberHoelzeman, Ronald Ghoelzema@engr.pitt.eduhoelzema@engr.pitt.edu
Date: 30 June 2011
Date Type: Completion
Defense Date: 2 April 2010
Approval Date: 30 June 2011
Submission Date: 5 April 2010
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: MSEE - Master of Science in Electrical Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: DC-DC Conversion; Energy Harvesting; Motion-Activated Switch; Reader; RFID; TAG; Vibrations
Other ID: http://etd.library.pitt.edu/ETD/available/etd-04052010-025847/, etd-04052010-025847
Date Deposited: 10 Nov 2011 19:34
Last Modified: 30 Jun 2016 05:15
URI: http://d-scholarship.pitt.edu/id/eprint/6777

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