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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
5 Y5 F, e& p+ g$ k. H1 x9 P. o7 z$ ]5 G1 f( O' z
This book is mainly intended for designers and users of magnetic components
1 n. B5 B i# `7 g; \6 l! x6 K' b) fin power electronics. It can also be used for didactical purposes. Magnetic6 K6 ~) V' U4 Y* @. n2 M
components such as inductors and transformers constitute together with the
9 h$ e0 n" O1 ?) S Jcontrol and the semiconductor components, the main parts in the design of
' t$ U3 i" N0 U$ Bpower electronic converters. Some experience teaches that the design of the: m, V& A" ~% N
magnetic parts is still often done by trial and error. This can be explained by
$ g3 o% X/ l( `' S: a1 U2 ia (too) long working-in time for designing inductors and transformers. The
* V# V3 Z0 k* f/ t% }7 o: odesign has many aspects, such as the magnetic core and winding, eddy currents,
) I1 w+ S. e! e: {: V; hinsulation, thermal design, parasitic effects, and measurements. A lot of' M% R( k: Z) @% @
literature exists concerning those subjects, but the information is spread over
2 L2 x. D7 S- _$ e8 m% T3 v" P: Zmany articles and methods. This book is mainly focused on classical methods
4 G) [7 z7 n( R% J) n6 d0 Hand uses numerical tools such as finite element methods in the background.4 ]/ B. n; ?' @$ a; M
We try to give some overview of the basics and technological aspects of the6 A2 T5 {+ o; q. ^7 {
design. In the different chapters we also describe analytical approximations0 r% L2 _: q: R" J' |( T3 q8 R
based on known analytical solutions, but tuned by finite elements. In most6 R) N) t2 u( m3 g$ c. ~9 K! G
of the cases, a sufficient accuracy can be obtained and the results are obtained$ P" B8 S" y6 m, h
almost instantaneously, even for graphics using many calculation points. A
3 r4 h* M5 l$ n% T9 K2 tfast approximation method is useful as a first step in the design stage, whereas' l; ^) V q4 X# A
numerical tools such as finite elements are good in analysis. Specific books+ x. [' u" P7 I: v9 Y+ I% T' r4 \3 v
on finite elements exist and the description will not be repeated here.
5 [3 o- L! R$ z1 F w/ e& @Some basic introduction on magnetic principles and materials are given j0 I) v' Z2 ^7 E* p/ F
in Chapter 1.
( P _1 }& D1 ^* K9 E/ i' DToday power electronics use quite a high switching frequency.& U/ O- V2 d' U9 |( w$ j5 c; j0 F
Simple rules
! o( n# l+ ?/ N3 K# Jof thumb such as that “the eddy copper current losses are always negligible- h/ M, `' Q6 d& q9 {4 H) Q
when the diameter of the wire is smaller than the penetration depth” are not
" g) @1 O5 {" atrue. However, it is clear that the main cause of the eddy current losses is
0 \$ f4 P p) Jcaused by the presence of high frequency transverse magnetic field components.
1 d+ G( \# I( C8 `" [This is the base of the fast design method in Chapter 2. The method
6 x3 ]& W% D, Y1 W [; _is further improved using some corrections for other effects and is embedded$ Y6 S7 t/ D4 y; K$ C
in a decision flow chart of a design procedure. More insight and better, C0 {! }9 Q7 W4 l4 c. M- o
accuracy is provided in the other chapters. We invite the readers to let them$ ?' C0 h8 z- i; O0 F7 {- E; \; |
guide by the contents of the book to their specific subjects of interest.. e: j/ \) q3 h
The chapters in the book are organized in a quite independent way with
( y! L3 s" ]) c* ]1 P" U; Xrespective local appendices and references. The general appendices at the x8 w2 F6 z) x8 |1 i, Q: g! h$ |: Z
end provide information that is not linked to a specific chapter and can be
# _% I7 A) n6 u+ f/ O; m6 D" Bused independently.
& L, N+ {4 l1 s9 Z6 v0 g) bThis work can be seen as complementary information to books on power
3 Y: h+ q( v+ f$ p1 t1 [. k) r( Selectronic circuits. Different levels of complexity are proposed depending on
; F6 d+ J+ c* X$ j9 fthe available time, the desired accuracy, and the mathematical level of the
" O I5 v6 h+ Y+ R) E& U9 `: `designer. |