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

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.

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Abstract

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

Item Type:Thesis (Masters)
Additional Information:Thesis (Master of Engineering (Electrical)) - Universiti Teknologi Malaysia, 2005; Supervisor : Assoc. Prof. Dr Zainal Salam
Uncontrolled Keywords:Isolated cycloconverter type high frequency (HF); power converter (inverter); asymmetric bipolar PWM control; switching techniques
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:3214
Deposited By: Ms Zalinda Shuratman
Deposited On:24 May 2007 04:46
Last Modified:13 Jul 2012 01:23

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