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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Online Access: | http://eprints.utm.my/id/eprint/3214/1/NgeCheeLimMFKE2005.pdf http://eprints.utm.my/id/eprint/3214/ https://core.ac.uk/display/11779603 |
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my.utm.32142018-06-26T07:56:22Z http://eprints.utm.my/id/eprint/3214/ Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer 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 NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/3214/1/NgeCheeLimMFKE2005.pdf Nge, Chee Lim (2005) Application of natural commutation technique to an improved cycloconverter type high-frequency link inverter with center-tapped transformer. Masters thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering. https://core.ac.uk/display/11779603 |
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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 |
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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 |
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Thesis |
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Nge, Chee Lim |
author_facet |
Nge, Chee Lim |
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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 |
publishDate |
2005 |
url |
http://eprints.utm.my/id/eprint/3214/1/NgeCheeLimMFKE2005.pdf http://eprints.utm.my/id/eprint/3214/ https://core.ac.uk/display/11779603 |
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13.15806 |