Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer

This thesis presents a new isolated cycloconverter type high frequency (HF) link dc to ac power converter (inverter) that consists of three arms of bidirectional switches at transformer secondary. This topology has the advantage of light weight and reduced switch count, compared to other types of HF...

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Main Author:	Nge, Chee Lim
Format:	Thesis
Language:	English
Published:	2005
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/3214/1/NgeCheeLimMFKE2005.pdf
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id	my-utm-ep.3214
record_format	uketd_dc
spelling	my-utm-ep.32142018-06-26T07:56:22Z Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer 2005-12 Nge, Chee Lim TK Electrical engineering. Electronics Nuclear engineering This thesis presents a new isolated cycloconverter type high frequency (HF) link dc to ac power converter (inverter) that consists of three arms of bidirectional switches at transformer secondary. This topology has the advantage of light weight and reduced switch count, compared to other types of HF link inverter. However, like all HF link inverter topologies, this topology also suffer high voltage surge problem and power device switching loss. In order to overcome these problems, two sets of switching technique, namely the asymmetric bipolar PWM control and edgealigned unipolar PWM control, are introduced. These switching techniques utilize natural commutation technique that enables total soft switching operation and voltage surge reduction. Furthermore, the proposed switching techniques are able to reduce the transistor conduction loss due to the existence of freewheeling period. The research work verifies of the proposed topology and switching techniques by means of SPICE simulations. It also describes the natural commutation mechanism for HF link inverter in detail. An open loop laboratory prototype based on the Infineon C167 fixed-point microcontroller was constructed. The results obtained from the experimental rig were found to be in very close agreement with the theoretical prediction and simulation. The laboratory prototype was able to supply output voltage 340Vrms as well as 120Vrms, with THD less than 2.5%. The total power conversion efficiency reaches 86% when the output power was beyond 300W 2005-12 Thesis http://eprints.utm.my/id/eprint/3214/ http://eprints.utm.my/id/eprint/3214/1/NgeCheeLimMFKE2005.pdf application/pdf en public https://core.ac.uk/display/11779603 masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Nge, Chee Lim Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
description	This thesis presents a new isolated cycloconverter type high frequency (HF) link dc to ac power converter (inverter) that consists of three arms of bidirectional switches at transformer secondary. This topology has the advantage of light weight and reduced switch count, compared to other types of HF link inverter. However, like all HF link inverter topologies, this topology also suffer high voltage surge problem and power device switching loss. In order to overcome these problems, two sets of switching technique, namely the asymmetric bipolar PWM control and edgealigned unipolar PWM control, are introduced. These switching techniques utilize natural commutation technique that enables total soft switching operation and voltage surge reduction. Furthermore, the proposed switching techniques are able to reduce the transistor conduction loss due to the existence of freewheeling period. The research work verifies of the proposed topology and switching techniques by means of SPICE simulations. It also describes the natural commutation mechanism for HF link inverter in detail. An open loop laboratory prototype based on the Infineon C167 fixed-point microcontroller was constructed. The results obtained from the experimental rig were found to be in very close agreement with the theoretical prediction and simulation. The laboratory prototype was able to supply output voltage 340Vrms as well as 120Vrms, with THD less than 2.5%. The total power conversion efficiency reaches 86% when the output power was beyond 300W
format	Thesis
qualification_level	Master's degree
author	Nge, Chee Lim
author_facet	Nge, Chee Lim
author_sort	Nge, Chee Lim
title	Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
title_short	Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
title_full	Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
title_fullStr	Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
title_full_unstemmed	Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
title_sort	application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2005
url	http://eprints.utm.my/id/eprint/3214/1/NgeCheeLimMFKE2005.pdf
_version_	1747814442406510592

Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer

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