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Inductors and Transformers For Power Electronics.part04.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
`! m/ V7 v6 P
3 T) y q/ K7 ?6 g9 Q( g1 ~This book is mainly intended for designers and users of magnetic components
$ p I4 [+ [# B( t- C9 jin power electronics. It can also be used for didactical purposes. Magnetic, ^/ h4 b- x% o0 R1 M7 u/ w
components such as inductors and transformers constitute together with the0 d l# y) I4 m C/ R, I
control and the semiconductor components, the main parts in the design of# Y/ J0 X! j: x+ m
power electronic converters. Some experience teaches that the design of the
9 `4 L8 c# { O$ [3 K" Smagnetic parts is still often done by trial and error. This can be explained by
$ Y, F* P# i) M" f$ Y F9 Va (too) long working-in time for designing inductors and transformers. The. N4 `3 h" @1 L' J5 Q7 A
design has many aspects, such as the magnetic core and winding, eddy currents,. S4 D6 t W3 Z' X& A
insulation, thermal design, parasitic effects, and measurements. A lot of$ B7 a8 ~1 t$ S6 }$ I9 w
literature exists concerning those subjects, but the information is spread over; K; T' {* {% K! T* H" K
many articles and methods. This book is mainly focused on classical methods
$ J* V& P& W: G7 Rand uses numerical tools such as finite element methods in the background." D2 p5 v* X# S
We try to give some overview of the basics and technological aspects of the
5 m7 O, q" H2 ]1 p' Sdesign. In the different chapters we also describe analytical approximations0 G( J7 ]% \) ^7 D2 u
based on known analytical solutions, but tuned by finite elements. In most
/ j8 N7 e% @9 f# v" bof the cases, a sufficient accuracy can be obtained and the results are obtained
2 u! M5 B0 A! W H# ~almost instantaneously, even for graphics using many calculation points. A% i! O" O4 O6 p! |) s& K4 P
fast approximation method is useful as a first step in the design stage, whereas' w$ {7 K, O: K T H C, z
numerical tools such as finite elements are good in analysis. Specific books- _* H7 ~4 R' q! m* j; [- A
on finite elements exist and the description will not be repeated here.
! N/ V5 u5 i+ dSome basic introduction on magnetic principles and materials are given
* T' I8 M) u+ E. @6 x! b( S* a/ \in Chapter 1.) {1 W8 q( h) x
Today power electronics use quite a high switching frequency.
* p' l! _( _, KSimple rules( x0 u8 e0 d7 _
of thumb such as that “the eddy copper current losses are always negligible7 M0 {0 V; T% p, c! O* [) V
when the diameter of the wire is smaller than the penetration depth” are not2 I) L, T; [" R4 F& M' [/ N
true. However, it is clear that the main cause of the eddy current losses is% w7 a$ B$ X7 p2 t6 X; H
caused by the presence of high frequency transverse magnetic field components.) \: m0 o8 \. g8 f5 h% ^1 E+ F
This is the base of the fast design method in Chapter 2. The method H* S0 n t; M; t- o! Z8 T
is further improved using some corrections for other effects and is embedded
/ e& S7 w: @2 |! r3 e- W) Min a decision flow chart of a design procedure. More insight and better0 I* c2 t. r+ ]7 A' Y9 ]/ e( K; V) e
accuracy is provided in the other chapters. We invite the readers to let them
" Q( O+ G/ [9 Q4 O8 lguide by the contents of the book to their specific subjects of interest.
% n+ x1 r6 h# B8 j3 ^1 nThe chapters in the book are organized in a quite independent way with
( { Y( C8 a$ @2 E' q2 crespective local appendices and references. The general appendices at the
8 c7 V" n4 b9 q) ^+ h5 \- _end provide information that is not linked to a specific chapter and can be5 S4 R$ ~% L/ B8 t& M
used independently.$ Z. N% q8 x+ h, d
This work can be seen as complementary information to books on power. H6 v4 d% _/ Q" S5 E+ ^; W
electronic circuits. Different levels of complexity are proposed depending on
; r0 b3 S8 |3 F' \* Qthe available time, the desired accuracy, and the mathematical level of the
7 q$ f4 [+ i# ^( Z# y& U- ddesigner. |