• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 43
  • 25
  • 14
  • 4
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 1
  • Tagged with
  • 103
  • 103
  • 45
  • 31
  • 31
  • 29
  • 26
  • 25
  • 21
  • 19
  • 19
  • 17
  • 16
  • 15
  • 14
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Modeling, analysis, and design of a 10 kVA, 20 kHz transformer /

Flory, Isaac Lynnwood, January 1993 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 99-101). Also available via the Internet.

Power losses and thermal modeling of a voltage source inverter

Oberdorf, Michael Craig. January 2006 (has links) (PDF)
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 2006. / Thesis Advisor(s): Alexander Julian. "March 2006." Includes bibliographical references (p. 103-104). Also available online.

Three phase current controlled PWM inverter using bipolar transistors

Salmon, John C. January 1984 (has links)
No description available.

Power Inverters

Vahedi-Faridi, Ezzatollah. 01 January 1978 (has links)
This paper treats the theory and basic design of a DC-AC inverter. The output voltage, a periodic wave form, is derived from a low level DC source. The inverter's operation is described in detail for two different classes of switching device: SCR and transistor. A new design configuration which achieves higher efficiency than most commercial inverters on the market is discussed. Laboratory measurements for the design are tabulated in order to give an estimate of its performance.

Investigation and mitigation of the adverse effects of PWM adjustable speed drives

Zhang, Haoran 15 December 1998 (has links)
With the introduction of high speed semiconductor power devices and the increased application of adjustable speed drives (ASDs) for efficient speed control of ac motors, there has been a growing number of costly motor-drive related process failures. It has been found that the high dv/dt and high switching frequency have caused premature motor insulation failures due to motor terminal over-voltages (exacerbated by longer cable lengths). It is also acknowledged that high dv/dt and high frequency common-mode voltages generated by pulse-width modulated (PWM) inverters contribute significantly to electromagnetic interference (EMI) and may also cause damaging bearing and leakage currents. In response to these problems, a variety of mitigation techniques have been proposed in the past. However, the known solutions usually address these problems one at a time and some of the mitigation techniques are not highly effective. The major objective of this research is to search for solutions to these ASD application issues with an emphasis on solving all of the problems at the source. Therefore, theoretical analysis of all the above adverse effects are presented and the existing mitigation techniques are evaluated in this dissertation. It is found that common-mode voltage is the major cause of both bearing currents and the conducted EMI, thus the research is focused on new inverter topologies and control strategies in order to eliminate the common-mode voltage. To achieve the goal of common-mode voltage cancellation, a novel dual-bridge inverter (DBI) is proposed and studied. The DBI employs an additional inverter output stage to drive a standard three-phase dual-voltage induction motor and is controlled to generate balanced excitation of the motor resulting in a zero common-mode voltage. It is shown through experimental results that the motor bearing current is eliminated and the conducted EMI is significantly reduced. In addition to the DBI, multilevel inverter topologies have also been studied. It has been found in this research that with proper selections of the switching states, certain multilevel PWM inverters will not generate common-mode voltages. This new control method is verified in simulation by using both sine-triangle intersection PWM (SPWM) and voltage space-vector modulation (SVM). / Graduation date: 1999

A DC voltage regulated, controlled current PWM rectifier /

Dixon, Juan W. (Juan Walterio) January 1986 (has links)
No description available.

New multilevel carrier-based pulse width modulation techniques applied to a diode-clamped converter for use as a universal power conditioner

Tolbert, Leon M. 05 1900 (has links)
No description available.

Z-source inverter design, analysis, and its application in fuel cell vehicles

Shen, Miaosen. January 2006 (has links)
Thesis (Ph. D.)--Michigan State University. Dept. of Electrical and Computer Engineering, 2006. / Title from PDF t.p. (viewed on Nov. 17, 2008) Includes bibliographical references (p. 168-175). Also issued in print.

A DSP controlled multi-level inverter providing DC-link voltage balancing, ride-through enhancement and common-mode voltage elimination /

Dai, Shaoan. January 2003 (has links)
Thesis (Ph. D.)--Oregon State University, 2004. / Printout. Includes bibliographical references (leaves 75-79). Also available on the World Wide Web.

Determining the optimum operating parameters of a unipolar PWM inverter a thesis /

McCarty, Michael James. Taufik. January 1900 (has links)
Thesis (M.S.)--California Polytechnic State University, 2010. / Title from PDF title page; viewed on June 10, 2010. Major professor: Taufik, Ph.D. "Presented to the faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree [of] Master of Science in Electrical Engineering." "May 2010." Includes bibliographical references (p. 67-69).

Page generated in 0.0664 seconds