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Coupled-Inductor Inversion, Rectification and Cycloconversion


El-Hamamsy, Sayed-Amr (1986) Coupled-Inductor Inversion, Rectification and Cycloconversion. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/BHKX-4J16.


A new PWM approach using three state switching of negatively coupled inductors can be applied to any basic dc-to-dc converter to form single-phase dc-to-ac inverters. Current reference programming gives improvements in linearity, small-signal dynamics, and pulsed-load response. The current programming loops of the flyback and boost inverters are stable at all operating points. New multiple output magnetic structures are introduced that apply space and time multiplexing of magnetics to give non-interacting outputs. The magnetics are analysed for different operating conditions. The inverters with two independent outputs are derived by use of the multiple output magnetics. These are used to form the three-phase versions of the inverters, The corresponding three-phase ac-to-dc rectifiers are also derived with close to ideal current waveforms as well as power factor correction capabilities. Finally, to complete the family of power converters the polyphase ac-to-ac cycloconverters are derived incorporating the qualities of both the inverters and the rectifiers.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Electrical Engineering; Computer Science
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Minor Option:Computer Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Middlebrook, Robert David
Thesis Committee:
  • Middlebrook, Robert David (chair)
  • Caughey, Thomas Kirk
  • Martel, Hardy Cross
  • Thompson, Peter M.
  • Martin, Alain J.
Defense Date:13 May 1986
Funding AgencyGrant Number
McDonnell-Douglas Astronautics CorporationUNSPECIFIED
General Dynamics CorporationUNSPECIFIED
Motorola Government Electronics DivisionUNSPECIFIED
Record Number:CaltechETD:etd-03262008-092115
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1154
Deposited By: Imported from ETD-db
Deposited On:04 Apr 2008
Last Modified:20 Dec 2019 20:02

Thesis Files

PDF (El-hammamsy_ss_1986.pdf) - Final Version
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