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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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Inductors and Transformers For Power Electronics.part02.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 Electronics4 N2 r [0 q# w( {# x- v
" j" {, c0 O, q, N# D7 ^This book is mainly intended for designers and users of magnetic components: ]$ H r! o" e- T/ b+ @
in power electronics. It can also be used for didactical purposes. Magnetic
4 r! F p( w; E1 y- B/ G% N$ Icomponents such as inductors and transformers constitute together with the) b {( N! i7 V0 m5 F% ^" v
control and the semiconductor components, the main parts in the design of
' E5 R7 \) a7 W* Q% y1 g: L1 gpower electronic converters. Some experience teaches that the design of the' u5 d0 h& d8 x" H k" ]
magnetic parts is still often done by trial and error. This can be explained by% s: O9 T% O; s; V, D5 _
a (too) long working-in time for designing inductors and transformers. The1 ?. Q D8 j# O1 \: w: R
design has many aspects, such as the magnetic core and winding, eddy currents,
6 l4 I! v2 v: E* r; n9 j) cinsulation, thermal design, parasitic effects, and measurements. A lot of% @ v/ q# }: Y" E4 G5 x
literature exists concerning those subjects, but the information is spread over
- q% r) o: G ^2 y! @- k8 c0 }many articles and methods. This book is mainly focused on classical methods4 I9 N$ G4 [( e; l0 G6 p0 n
and uses numerical tools such as finite element methods in the background.0 a; h! d6 F5 d: R$ m9 X: O% i
We try to give some overview of the basics and technological aspects of the2 Z& d& q* s6 D- H+ H
design. In the different chapters we also describe analytical approximations7 F0 X6 A/ W, r B1 v; C
based on known analytical solutions, but tuned by finite elements. In most
$ r$ y. q% P% S7 J9 h! E/ oof the cases, a sufficient accuracy can be obtained and the results are obtained
8 r; Z9 l$ c8 b3 walmost instantaneously, even for graphics using many calculation points. A
5 G: A* ^6 l8 n7 V: G Ufast approximation method is useful as a first step in the design stage, whereas
! h5 }' g& c5 Y5 E Q) nnumerical tools such as finite elements are good in analysis. Specific books
0 X$ H5 V7 s, B' c* d1 Y: Q& R/ mon finite elements exist and the description will not be repeated here.9 v+ D* ]& t% x4 g, B
Some basic introduction on magnetic principles and materials are given- A# [9 {% K' {8 ?
in Chapter 1.4 M3 b; t) f+ \# B" [5 n( z6 T
Today power electronics use quite a high switching frequency.
- G' m$ S* ~2 L6 xSimple rules
! R+ z* @' i2 \4 g$ Gof thumb such as that “the eddy copper current losses are always negligible
( o2 @# ^& n" q/ o' Hwhen the diameter of the wire is smaller than the penetration depth” are not! R9 }( e9 @+ X/ w% d3 Y
true. However, it is clear that the main cause of the eddy current losses is; A7 `$ M& k8 y2 B' P
caused by the presence of high frequency transverse magnetic field components.' F {" K! c: T
This is the base of the fast design method in Chapter 2. The method
% T& N$ t0 j+ o5 Gis further improved using some corrections for other effects and is embedded+ l. @. s2 P! Y* z; y* \
in a decision flow chart of a design procedure. More insight and better
9 V- N' j! [3 i9 B5 ?accuracy is provided in the other chapters. We invite the readers to let them
* I* g; M7 T" H v( Uguide by the contents of the book to their specific subjects of interest." `9 t2 z2 R# ^$ ]# q
The chapters in the book are organized in a quite independent way with
1 T0 p( ?2 z* S% V+ trespective local appendices and references. The general appendices at the
+ `6 _0 A; U" m. \) H; Bend provide information that is not linked to a specific chapter and can be
1 [! r& Y; g/ [ H7 \9 b+ tused independently.. @8 N8 ?4 f3 `1 ^0 k: ?! j+ |
This work can be seen as complementary information to books on power' G8 a/ v- y1 u. n! k. k; l
electronic circuits. Different levels of complexity are proposed depending on
2 e3 `/ {5 x6 fthe available time, the desired accuracy, and the mathematical level of the; S! g1 K- P8 b( a/ l" B3 _
designer. |