Skip to Main Content
Frequently Asked Questions
Submit an ETD
Global Search Box
Need Help?
Keyword Search
Participating Institutions
Advanced Search
School Logo
Files
File List
AAbdelmoaty_PhD_Dissertation_AU2016.pdf (9.84 MB)
ETD Abstract Container
Abstract Header
Circuit and System Techniques for Energy-Harvesting Platforms for Mobile Applications
Author Info
Abdelmoaty, Ahmed A
ORCID® Identifier
http://orcid.org/0000-0003-4031-1631
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1481832223757049
Abstract Details
Year and Degree
2017, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Abstract
With the widespread use of mobile devices, such cellular phones, tablets, laptops, and navigation devices, consumers are demanding higher performance, more functionality, reduced weight, and more importantly longer battery life. However, improving battery life is becoming increasingly difficult due to the limited improvement in the energy density of the battery technology. Therefore, improving battery life can be only achieved by increasing the battery size, which is not a preferable solution for portable devices that have severe size and weight limitations. Other solutions include circuit techniques to reduce the power consumption of the analog and digital circuit components of the device, or by employing system techniques such as the famous Dynamic Voltage Scaling (DVS) or Dynamic Frequency Scaling (DFS) that can optimize the power consumption at the system level. However, the improvement due to these techniques is becoming negligible due to the diminishing returns of the semiconductor technology scaling. As a result, the electronics industry is considering other alternatives such as energy harvesting to enhance the effective battery life in portable devices. Harvesting ambient energy from the sun, heat, or vibration can provide a reliable solution to recharge the battery of these devices during idle times or supply the load power directly without relying on the battery. Although prolonging the battery life through energy harvesting can be an attractive solution, it faces several challenges in order to be realized efficiently in portable devices. The major challenge is the ability to harvest the maximum energy from the input source and deliver it to the load efficiently. The mechanism of losing the energy in these systems can occur in the power conversion stages that deliver the harvested energy to the load. Therefore, traditional energy-harvesting systems mainly suffer from a degraded overall efficiency since it relies on several power conversion stages to realize a full energy-harvesting system. The second reason for losing energy in these systems is due to employing power-hungry control circuits such as the Maximum Power Point Tracking (MPPT) circuit. This circuit is necessary in any energy harvesting system in order to track the maximum harvested energy from the input source. This research work provides several circuit and system techniques in order to propose an efficient power management platform for an energy-harvesting system that targets mobile applications. Unlike traditional architectures, the proposed platform features delivering the harvested energy to the load using a single power conversion stage in order to achieve high overall efficiency. Furthermore, major improvements are proposed for the control circuits of the energy-harvesting platforms such as an implementation of a full MPPT circuit with an ultra-low power consumption. In addition, a novel level-shifting circuit for energy-harvesting platforms with a sub-nano-second propagation delay and low power consumption is introduced.
Committee
Ayman Fayed (Advisor)
Patrick Roblin (Committee Member)
Steven Bibyk (Committee Member)
Pages
124 p.
Subject Headings
Electrical Engineering
;
Systems Design
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Abdelmoaty, A. A. (2017).
Circuit and System Techniques for Energy-Harvesting Platforms for Mobile Applications
[Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1481832223757049
APA Style (7th edition)
Abdelmoaty, Ahmed.
Circuit and System Techniques for Energy-Harvesting Platforms for Mobile Applications.
2017. Ohio State University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1481832223757049.
MLA Style (8th edition)
Abdelmoaty, Ahmed. "Circuit and System Techniques for Energy-Harvesting Platforms for Mobile Applications." Doctoral dissertation, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1481832223757049
Chicago Manual of Style (17th edition)
Abstract Footer
Document number:
osu1481832223757049
Download Count:
1,329
Copyright Info
© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.