Pitt Logo LinkContact Us

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.

[img] PDF - Primary Text
Restricted to University of Pittsburgh users only until 30 June 2016.

Download (2663Kb) | Request a copy

    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.


    Share

    Citation/Export:
    Social Networking:

    Details

    Item Type: University of Pittsburgh ETD
    ETD Committee:
    ETD Committee TypeCommittee MemberEmail
    Committee ChairMickle, Marlin Hmickle@ee.pitt.edu
    Committee CoChairStanchina, William Ewstanchina@engr.pitt.edu
    Committee MemberHoelzeman, Ronald Ghoelzema@engr.pitt.edu
    Title: Passive DC-DC Conversion Technique for Vibration Environments and its Application in RFID Systems
    Status: Unpublished
    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.
    Date: 30 June 2011
    Date Type: Completion
    Defense Date: 02 April 2010
    Approval Date: 30 June 2011
    Submission Date: 05 April 2010
    Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
    Patent pending: No
    Institution: University of Pittsburgh
    Thesis Type: Master's Thesis
    Refereed: Yes
    Degree: MSEE - Master of Science in Electrical Engineering
    URN: etd-04052010-025847
    Uncontrolled Keywords: DC-DC Conversion; Energy Harvesting; Motion-Activated Switch; Reader; RFID; TAG; Vibrations
    Schools and Programs: Swanson School of Engineering > Electrical Engineering
    Date Deposited: 10 Nov 2011 14:34
    Last Modified: 18 Apr 2012 11:33
    Other ID: http://etd.library.pitt.edu/ETD/available/etd-04052010-025847/, etd-04052010-025847

    Actions (login required)

    View Item

    Document Downloads