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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 Electronics; @1 ~! d: q; _6 Z* E6 v
" e( m/ u3 C! w8 xThis book is mainly intended for designers and users of magnetic components
$ U4 i" w& u& q( y4 j, u6 bin power electronics. It can also be used for didactical purposes. Magnetic: X: Q' i% C% v/ X
components such as inductors and transformers constitute together with the* \" T" P5 r, C+ W8 B! H! R3 l5 S
control and the semiconductor components, the main parts in the design of
5 ^4 v, m. f- S( E spower electronic converters. Some experience teaches that the design of the
2 {: @# i6 U' e, m) `: I' amagnetic parts is still often done by trial and error. This can be explained by
" B( \, H1 |' U4 u* V: Q5 n" fa (too) long working-in time for designing inductors and transformers. The
# j) O. `0 e* ^. s7 q* y$ ddesign has many aspects, such as the magnetic core and winding, eddy currents,7 W* B( g y/ n8 Q b
insulation, thermal design, parasitic effects, and measurements. A lot of0 v7 s% O) v- h& R
literature exists concerning those subjects, but the information is spread over) Q3 b! ^( E' j7 F0 M% t
many articles and methods. This book is mainly focused on classical methods
: t6 y1 ~' O4 Y* {and uses numerical tools such as finite element methods in the background., m9 `- H/ z( b4 x
We try to give some overview of the basics and technological aspects of the0 n( Q) q" l0 X6 H5 d2 O: T
design. In the different chapters we also describe analytical approximations
& s& F& C J) }8 Wbased on known analytical solutions, but tuned by finite elements. In most
5 b1 e. L+ E% ~' ~! Xof the cases, a sufficient accuracy can be obtained and the results are obtained
( h" e0 x3 d8 I8 a1 O3 h& t0 ~almost instantaneously, even for graphics using many calculation points. A
, f2 z, @7 D! j" Zfast approximation method is useful as a first step in the design stage, whereas. {4 P: V# J7 V/ q' M0 J3 I
numerical tools such as finite elements are good in analysis. Specific books6 @) [0 H4 t I, e. J
on finite elements exist and the description will not be repeated here.2 x: w9 _# I7 O* ~- p
Some basic introduction on magnetic principles and materials are given0 Z: B' S# c+ V$ }0 w* J: W
in Chapter 1.
+ E6 h' L" p# v8 }! cToday power electronics use quite a high switching frequency.0 D" I; Q& L% C8 z5 w0 M
Simple rules
3 I9 C# M4 S9 c! o3 e2 Z" yof thumb such as that “the eddy copper current losses are always negligible3 \7 z) C5 n7 a/ g$ Q# U: e
when the diameter of the wire is smaller than the penetration depth” are not
3 j1 w$ P2 c% W- ~true. However, it is clear that the main cause of the eddy current losses is
2 f3 Z% ?/ }) K6 ccaused by the presence of high frequency transverse magnetic field components.. ^7 }2 r/ K, w9 Q' L1 b
This is the base of the fast design method in Chapter 2. The method
7 [1 {* n) ]' T$ p: t4 I9 f9 mis further improved using some corrections for other effects and is embedded
; G, \0 z; x4 A( win a decision flow chart of a design procedure. More insight and better! ^# x* r4 M; f; v
accuracy is provided in the other chapters. We invite the readers to let them7 a6 M0 K* r! x0 F
guide by the contents of the book to their specific subjects of interest.- \: @/ q! `, `2 V4 E3 n
The chapters in the book are organized in a quite independent way with4 T2 K P3 A/ H0 e+ {; F
respective local appendices and references. The general appendices at the
& s E4 q( j; u, s' k6 i$ c; ?end provide information that is not linked to a specific chapter and can be3 v- Y3 w, r. {- L
used independently.3 U& J0 Z. A, G7 Q6 Q( @' \: j
This work can be seen as complementary information to books on power
" m0 \8 h! ? i9 T/ Xelectronic circuits. Different levels of complexity are proposed depending on7 U3 T. ?2 \0 | o, P
the available time, the desired accuracy, and the mathematical level of the
$ \4 ^9 G j7 Rdesigner. |