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TRANSFORMERS AND INDUCTORS FOR POWER ELECTRONICS
Introduction
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| TRANSFORMERS AND INDUCTORS FOR POWER ELECTRONICS |
The design of magnetic components such as transformers and inductors has been of interest to electronic and electrical engineers for many years. Traditionally, treatment of the topic has been empirical, and the ‘cook-book’ approach has prevailed. In the past, this approach has been adequate when conservative design was acceptable. In recent years, however, space and cost have become premium factors in any design, so that the need for tighter designs is greater.
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The power supply remains one of the biggest components in portable electronic equipment. Power electronics is an enabling technology for power conversion in energy systems. All power electronic converters have magnetic components in the form of transformers for power transfer and inductors for energy storage. The momentum towards high-density, high-efficiency power supplies continues unabated. The key to reducing the size of power supplies is high-frequency operation, and the bottleneck is the design of the magnetic components. New approaches are required, and concepts that were hitherto unacceptable to the industry are gaining ground, such as planar magnetics, integrated magnetics and matrix configurations. The design of magnetic components is a compromise between conflicting demands. Conventional design is based on the premise that the losses are equally divided between the core and the winding. Losses increase with frequency, and high-frequency design must take this into account.
General electronic instrumentation
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Table of Contents
Chapter 1 Introduction
1.1 Historical Context 1
1.2 The Laws of Electromagnetism
1.3 Ferromagnetic Materials 7
1.4 Losses in Magnetic Components
1.5 Magnetic Permeability 14
1.6 Magnetic Materials for Power Electronics
1.7 Problems
SECTION I INDUCTORS 23
Chapter 2 Inductance 25
2.1 Magnetic Circuits 25
2.2 Self and Mutual Inductance 30
2.3 Energy Stored in the Magnetic Field of an Inductor
2.4 Self and Mutual Inductance of Circular Coils
2.5 Fringing Effects around the Air Gap 48
2.6 Problems
Chapter 3 Inductor Design 55
3.1 The Design Equations
3.2 The Design Methodology 61
3.3 Design Examples
3.4 Multiple Windings
3.5 Problems
SECTION II TRANSFORMERS 93
Chapter 4 Transformers 95
4.1 Ideal Transformer
4.2 Practical Transformer
4.3 General Transformer Equations
4.4 Power Factor 116
4.5 Problems
Chapter 5 Transformer Design 123
5.1 The Design Equations
5.2 The Design Methodology 128
5.3 Design Examples
5.4 Transformer Insulation
5.5 Problems
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TRANSFORMERS AND INDUCTORS FOR POWER ELECTRONICS
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