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(Unpublished)
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Unpublished |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: |
| Creators | Email | Pitt Username | ORCID  |
|---|
| Ravilla, Sree Kalyan | srr32@pitt.edu | SRR32 | |
|
| ETD Committee: |
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| 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: |
19 Dec 2016 14:35 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/6777 |
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