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Inductors and Transformers For Power Electronics.part04.rar
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Inductors and Transformers For Power Electronics.part01.rar
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发本好书,与电力电子的兄弟们分享。Inductors and Transformers For Power Electronics
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This book is mainly intended for designers and users of magnetic components
0 Z. H: W" F: n) `$ u6 l) uin power electronics. It can also be used for didactical purposes. Magnetic
1 j+ j6 W6 x" ~6 Hcomponents such as inductors and transformers constitute together with the1 n7 o# ~) L7 g7 P# ^! Q/ K
control and the semiconductor components, the main parts in the design of d2 P4 D( Z5 _6 o- t
power electronic converters. Some experience teaches that the design of the1 }2 b8 h" p8 n2 [, q+ b) a+ n
magnetic parts is still often done by trial and error. This can be explained by _ _( p4 m1 z( N0 ]
a (too) long working-in time for designing inductors and transformers. The
3 S: P% i% u% {0 T4 Adesign has many aspects, such as the magnetic core and winding, eddy currents,8 W( |6 }" W, d
insulation, thermal design, parasitic effects, and measurements. A lot of
3 X) s6 Z2 P# p8 Q& n( ^literature exists concerning those subjects, but the information is spread over/ W5 N$ a! O4 r# v4 Q- d
many articles and methods. This book is mainly focused on classical methods
- O: g8 F! d7 N8 i3 Y# p! F% ]# yand uses numerical tools such as finite element methods in the background.
7 V0 H2 ^8 E) n- M1 H' DWe try to give some overview of the basics and technological aspects of the
0 M5 |! l# F. c4 `6 ^) U1 f% Y. c( k; ddesign. In the different chapters we also describe analytical approximations+ E( ?- y7 _# U1 @
based on known analytical solutions, but tuned by finite elements. In most# b1 M2 Z1 Y. ^' ^0 K* C& M# o
of the cases, a sufficient accuracy can be obtained and the results are obtained
" r. }8 l* v, e1 y0 |almost instantaneously, even for graphics using many calculation points. A+ a4 V% c8 W9 P/ e" A! \
fast approximation method is useful as a first step in the design stage, whereas* I' _8 C6 `& T6 F
numerical tools such as finite elements are good in analysis. Specific books/ z8 l8 ?% g, u+ X& k- h! o9 D
on finite elements exist and the description will not be repeated here.1 u+ s, p( N* c1 X8 A& l6 l+ Q
Some basic introduction on magnetic principles and materials are given" X B2 N {2 L0 I
in Chapter 1.9 b6 }5 t% @# Y2 b
Today power electronics use quite a high switching frequency.
+ [) P, b2 p7 }& }5 z- NSimple rules' g5 M2 _7 W5 z" m' M
of thumb such as that “the eddy copper current losses are always negligible4 o4 E- Z& t; g1 S
when the diameter of the wire is smaller than the penetration depth” are not5 Y" Q0 c# ]& D, _6 A+ {
true. However, it is clear that the main cause of the eddy current losses is3 D4 {6 j5 h5 b
caused by the presence of high frequency transverse magnetic field components.
* y# s( w1 @( W0 H% C) AThis is the base of the fast design method in Chapter 2. The method
, w8 Z9 ^2 T" X1 kis further improved using some corrections for other effects and is embedded. G3 `6 d, b/ [9 F/ V9 t% }
in a decision flow chart of a design procedure. More insight and better
# [# ~& u5 H" @( n/ k. Q" z, Maccuracy is provided in the other chapters. We invite the readers to let them
" N$ ~1 @* a, w6 X& tguide by the contents of the book to their specific subjects of interest.
4 w4 v" K, O# F5 K4 @5 k9 NThe chapters in the book are organized in a quite independent way with
* d( Z) j& z2 y3 ]4 vrespective local appendices and references. The general appendices at the
0 G1 `2 m0 s, U/ ]5 lend provide information that is not linked to a specific chapter and can be
+ }9 ^3 a# i6 i+ C& d* Dused independently.
% {0 c+ f2 {& K& @This work can be seen as complementary information to books on power3 x. [3 w+ o. `& C2 C
electronic circuits. Different levels of complexity are proposed depending on& m: A! M9 |4 A* K: m
the available time, the desired accuracy, and the mathematical level of the
9 w+ R4 V6 I3 H+ H. s1 _8 L: y# Adesigner. |