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thesisfinal.pdf (954.99 KB)
ETD Abstract Container
Abstract Header
Hysteretic controlled DC-DC converters
Author Info
Chauhan, Shweta
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=wright1418308376
Abstract Details
Year and Degree
2014, Master of Science in Engineering (MSEgr), Wright State University, Electrical Engineering.
Abstract
Switched-mode DC-DC converters are widely used in applications requiring step-up and step-down of DC voltages or currents. These converters find their use in portable applications such as laptops and smart phones, radio-frequency power amplifiers, as light emitting diode (LED) drivers, etc. The power converters consist of a switching network, energy storage elements such as inductors and capacitors, and a load resistor. Transformers are used in converters, which require isolation. The switching network comprises of MOSFETs and diodes. With improvement in the VLSI technology, smaller MOSFETs with increased power handling capability are pushing the speed of operation of these power converters to the gigahertz (GHz) range. Operation at such high frequencies not only requires energy-efficient semiconductor switches, but also demands for faster control mechanisms. Amongst the various power converter control schemes studied in literature for high-frequency applications, the hysteretic control scheme is given high importance. The hysteretic controller employs a basic operational amplifier (op-amp) and works similar to the Schmitt trigger with hysteresis. Also, the bandwidth of op-amps is theoretically infinite and can be designed with ease for many applications, making the hysteretic controller scheme, simple and widely used method. This thesis focuses on understanding the operation and characteristics of the hysteretic control scheme. Initially, a buck DC-DC pulse-width modulated (PWM) converter is used as the power stage and the hysteretic controller is designed to ensure proper regulation of the output voltage of the buck converter. Two different types of hysteretic control mechanisms, namely (a) dual-charging mode and (b) capacitive-charging mode are investigated. The equations necessary to design the controller for both modes are derived. Extensive simulations are performed in order to evaluate the load and line regulation with and without the controller. Further, similar analysis is performed using a boost DC-DC PWM power converter as the power stage. Various characteristics such as percentage load regulation (LOR), percentage line regulation (LNR), and total harmonic distortion (THD) are estimated for buck converters.
Committee
Marian Kazimierczuk, Ph.D. (Committee Chair)
Kuldip Rattan, Ph.D. (Committee Member)
Yan Zhuang, Ph.D. (Committee Member)
Pages
83 p.
Subject Headings
Electrical Engineering
;
Engineering
Keywords
engineering
;
electrical engineering
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Citations
Chauhan, S. (2014).
Hysteretic controlled DC-DC converters
[Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1418308376
APA Style (7th edition)
Chauhan, Shweta.
Hysteretic controlled DC-DC converters.
2014. Wright State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=wright1418308376.
MLA Style (8th edition)
Chauhan, Shweta. "Hysteretic controlled DC-DC converters." Master's thesis, Wright State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1418308376
Chicago Manual of Style (17th edition)
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Document number:
wright1418308376
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Copyright Info
© 2014, some rights reserved.
Hysteretic controlled DC-DC converters by Shweta Chauhan is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Wright State University and OhioLINK.