Electromagnetic Modelling of Power Electronic Converters

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Springer Science & Business Media, Aug 31, 1989 - Technology & Engineering - 173 pages
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The era of the personal computer has, without doubt, permanently altered our life style in a myriad of ways. The "brain" of the personal computer is the microprocessor (together with RAM and ROM) which makes the decisions needed for the computer to perform in the desired manner. The microprocessor continues to evolve as increasingly complex tasks are required. While not sharing the limelight of the microprocessor, the "heart" of the personal computer, namely the power supply, is equally important since without the necessary source of power the microprocessor would be a useless piece of silicon. The power supply of twenty years ago was much different than its modem day equivalent. At the dawn of the personal computer era in the late 1970s, de power was obtained from a simple diode bridge. However, the need for smooth, regulated DC at low voltage required at the same time both a bulky input transformer and a large dc side ftlter. Those computer fans present at the birth of this industry can remember the large boxes housing our Altair, Cromemco and Northstar computers which was made necessary largely because of the huge power supply. It is not well appreciated but certainly true that the huge sucess of the Apple II computer in those days was due, at least in part, to the relatively slim proftle of the machine. This sleek appearance was largely due to the adoption of the then new and unproven switched mode power supply.
 

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Contents

CIRCUIT ANALYSIS FROM AN ELECTROMAGNETIC VIEWPOINT DESIGN OPTIMISATION BEYOND THE SCOPE OF CONVENTIONAL C...
1
12 SKIN AND PROXIMITY EFFECTS
2
13 INDUCTOR COILS
5
14 TRANSFORMERS
10
15 ELECTROMAGNETICS IN POWER CONVERTERS
12
POYNTING VECTOR A METHOD TO DESCRIBE THE MECHANISM OF POWER CONDITIONING
15
22 THE ENERGY FLUX VIEWPOINT OF POWER ELECTRONICS
17
23 PROPAGATION OF A PULSE ALONG A TRANSMISSION LINE
18
53 INTERNAL IMPEDANCE
72
54 PREDICTIONS AND EXPERIMENTAL MEASUREMENTS
78
55 REFERENCES
81
SKIN AND PROXIMITY EFFECT LOSSES IN TRANSFORMER AND INDUCTOR WINDINGS
83
62 EDDY LOSSES IN ROUND AND STRIP CONDUCTORS
85
63 EDDY LOSSES IN STRANDED WIRES
88
64 CURRENT DISTRIBUTION ALONG THE WIDTH OF STRIP WINDINGS
90
65 MANIFESTATION OF EDDY CURRENTS IN WINDING SECTIONS
93

24 POYNTING VECTOR IN POWER LINES
19
25 FLOW OF ENERGY AROUND OBSTACLES
23
26 POYNTING VECTOR IN CAPACITORS
24
27 POYNTTNG VECTOR IN INDUCTORS
26
28 POYNTING VECTOR IN TRANSFORMERS
28
29 POYNTTNG VECTOR IN ELECTRIC MACHINES
31
210 REFERENCES
32
POWER CONDITIONING IN ELECTRONIC CIRCUITS
35
32 ENERGY FLOW IN A SWITCHMODE CIRCUIT EXAMPLE
36
33 POWER TRANSFER EFFICIENCY
38
34 MODELLING OF CONNECTION STRUCTURES IN CIRCUITS
41
35 CIRCUIT REPRESENTATION OF CONNECTION STRUCTURES
42
36 INTERACTION BETWEEN CONNECTION STRUCTURES AND ELECTRONTC SWITCHES
44
37 A CONNECTION STRUCTURE AS A GENERAL PURPOSE POWER CONDITIONING ELEMENT
46
38 REFERENCES
48
EDDY CURRENTS IN CONDUCTORS
49
42 APPLICATION OF MAXWELLS EQUATIONS
50
43 NUMERICAL METHODS49
53
44 ANALYTICAL METHODS
55
45 ONE DIMENSIONAL SOLUTIONS
56
46 REFERENCES
64
STRUCTURAL IMPEDANCE OF POWER CONNECTIONS ANALYSIS AND METHOD OF CALCULATION
67
52 EXTERNAL IMPEDANCE
70
66 REFERENCES
96
MAGNETIC FIELD INSIDE WINDINGS A KEY PARAMETER IN THE PROXIMITY EFFECT EQUATION
97
72 METHOD OF IMAGES
98
73 METHOD OF IMAGES TO CALCULATE THE STRAY MAGNETIC FIELD IN WINDINGS
100
74 MAGNETIC FIELD OF A RECTANGULAR UNIFORM CURRENT DISTRIBUTION
103
75 MAGNETIC FIELD OF CIRCULAR CURRENT FILAMENTS
105
76 REFERENCES
106
EXPERIMENTAL MEASUREMENT OF EDDY CURRENT LOSSES IN TRANSFORMER WINDINGS AND INDUCTOR COILS
107
82 MEASUREMENTS ON SINGLE LAYER COILS AND COMPARISON OF ALGORITHM WITH BUTTERWORTHS EQUATIONS
108
83 MEASUREMENT OF MULTILAYER COILS AND TRANSFORMER WINDINGS
113
84 REFERENCES
124
EVALUATION AND CONCLUSIONS
125
92 STRUCTURAL IMPEDANCE OF POWER CONNECTIONS
126
94 EXPERIMENTAL PROCEDURE TO MEASURE AC RESISTANCE
127
95 REFERENCES
128
EXPERIMENT FOR DETERMINING THE AC RESISTANCE OF INDUCTOR COILS AND TRANSFORMER WINDINGS
129
COMPUTER PROGRAM PIP Parasitic Impedance Program
145
COMPUTER PROGRAM TID Transformer and Inductor Design
151
COMPUTER PROGRAM CID Coil Inductor Design
161
LIST OF SYMBOLS
169
INDEX
171
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