Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.768642
Title: The application of communication principles to pulse-width modulated inverters
Author: Jayne, M. G.
Awarding Body: Gwent College of Higher Education
Current Institution: University of South Wales
Date of Award: 1976
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Abstract:
The object of this dissertation is to show that communication principles may be usefully applied to pulse-width­ modulated inverters to increase their useable frequency range, without increasing the switching frequency of the power devices. The prior-art techniques of reducing harmonic distortion in pulse-width-modulated inverters is investigated, and it is shown that such techniques are mainly applicable -to constant voltage/constant frequency inverters. It is shown that the sampling process inherent in existing pulse-width-modulated inverters is natural sampling. The results of theoretical and experimental analysis shows that this sampling process is the cause or considerable unwanted harmonic distortion at low values of carrier frequency to modulating frequency ratio when operating in both the synchronous mode and asynchronos mode. The concept of regular sampling which is common in communication engineering but which has not previously been used in power inverters, is applied to the pulse-width­ modulation process, and it is shown that such techniques eradicate I the many undesirable features introduced by natural sampling. The construction of a practical thyristor pulse-width­ modulated inverter whose control circuits incorporate regular sampling techniques is described. A harmonic spectral analysis of the output voltage waveforms from the power inverter shows that the useable frequency range of the inverter is considerably increased by the application of regular sampling techniques to the control circuit, without increasing the switching frequency of the power devices.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.768642  DOI: Not available
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