TAILIEUCHUNG - High frequency transformer, design and modelling using finite element technique

High frequency transformer, design and modelling using finite element technique resentresearchis focussedon finding a general model of an exact transformerequivalentcircuit to cover the wide thesis is completedwith a conclusion. | HIGH FREQUENCY TRANSFORMER DESIGN AND MODELLING USING FINITE ELEMENT TECHNIQUE BY ADIL H. MUHAMMED MPhil A THESIS IS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE FACULITY OF ENGINEERING NEWCASTLE UNIVERSITY LIBRARY 201 29469 5 THE UNIVERSITY OF NEWCASTLE UPON TYNE 2000 ABSTRACT The field of high power density power supplies has received much attention in recent years. The area of the most concern is to increase the switching frequency so as to achieve a reduction in the power supply size. Such concern in high frequency power conversion units has led to many resonant structures quasi multi and pseudo . In all resonant types the power transfer from the source to the load is controlled by varying the ratio of operating to resonant frequencies. Every effort has been made to reduce the switching losses using zero voltage and or zero current techniques. In contrast little attention has been given to the area of the design of the magnetic components at high frequency operation. It is usually accepted that the weak point in further high frequency power supply design is in the magnetic devices transformer and inductor . No accurate model of the transformer taking into account the high frequency range has been performed yet. It is well known that as the frequency increases so the transformer model becomes more complicated due to the complexity of the transformer element distribution and the nature of frequency dependence of some of these elements. Indeed work of this kind can take many directions and the attempt here is to introduce a number of mathematics analytical numerical and practical directions to model the transformer. The main factors affecting the high frequency performance are the eddy current losses leakage flux and the effects due to the transformer elements where the transformer is part of the resonant converter. Two dimensional transformer finite element modelling is used to examine different cases including open and short circuit conditions. The .

• Thạc sĩ - Tiến sĩ - Cao học
• High frequency transformer
• Design and modelling using finite element technique
• Power transformer design
• Practicalconsiderationof the power supply
• 2D FE transformermeshmodel
• Copperlossesin the circuit wiring
• Design of high density transformers
• High frequency high power converters
• High power converter applications
• Conventional high frequency magnetic materials
• Characteristics of nanocrystalline materials
• Transformer specifications of the PRC operation
• Current transformer
• Electrical steel
• Magnetic core
• Total harmonic distortion
• High frequency harmonic
• Relative error