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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 Electronics1 e: D/ ~- e3 [# C, y2 G3 g$ q; y8 x
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This book is mainly intended for designers and users of magnetic components0 e+ }2 z1 |* ]% s% S7 p0 G
in power electronics. It can also be used for didactical purposes. Magnetic: R% W) d( d( \5 B# Q! G! R
components such as inductors and transformers constitute together with the
: w/ G& `" O: ^3 a. mcontrol and the semiconductor components, the main parts in the design of
" d7 h2 t0 j9 {# M \power electronic converters. Some experience teaches that the design of the
' V1 A( l" w6 U/ N3 H& L2 u; R/ ~magnetic parts is still often done by trial and error. This can be explained by
1 J8 I6 {5 X# |; s1 n5 g% r5 La (too) long working-in time for designing inductors and transformers. The: h) R+ S7 p' r% J7 v# {( L' n
design has many aspects, such as the magnetic core and winding, eddy currents,/ L! O+ g" ^5 Z3 m, @' G ?$ d
insulation, thermal design, parasitic effects, and measurements. A lot of
9 K4 ?( q e% Jliterature exists concerning those subjects, but the information is spread over
8 P" C* {- c* d2 a& @, Nmany articles and methods. This book is mainly focused on classical methods
, P5 |6 l8 w- m$ ~/ Z# Zand uses numerical tools such as finite element methods in the background.+ U* M w9 S! P1 f" a- |
We try to give some overview of the basics and technological aspects of the
8 Q5 o8 W+ q: ~4 V1 l3 O/ Hdesign. In the different chapters we also describe analytical approximations* ~ B) N5 Y) H% E$ C, c: F
based on known analytical solutions, but tuned by finite elements. In most
0 ~1 t `. ?; a; S qof the cases, a sufficient accuracy can be obtained and the results are obtained8 ^' U* o6 ?4 k
almost instantaneously, even for graphics using many calculation points. A6 N0 P! G& F) Z- }# S: G$ O. I
fast approximation method is useful as a first step in the design stage, whereas
! V' q4 f v% D% [numerical tools such as finite elements are good in analysis. Specific books
, }6 J1 ?2 l0 r" A1 @8 j6 von finite elements exist and the description will not be repeated here.: u4 E! i0 j( o$ }' O c7 I
Some basic introduction on magnetic principles and materials are given
4 [- ]9 d0 t; J9 U4 d: ]in Chapter 1.) }$ {- ?2 F& c! h
Today power electronics use quite a high switching frequency.! x1 e: c1 F9 H9 R8 W. q9 U
Simple rules
- Q0 ] j8 r( x& B: Z1 rof thumb such as that “the eddy copper current losses are always negligible
- J# p; w* ?- _1 {/ m$ |5 m* awhen the diameter of the wire is smaller than the penetration depth” are not( n! ?; G% [ [3 p
true. However, it is clear that the main cause of the eddy current losses is; b& G0 [ i. {, o$ R# |
caused by the presence of high frequency transverse magnetic field components.4 z: @* [$ v8 h" _
This is the base of the fast design method in Chapter 2. The method
5 ?1 G$ l$ K7 @8 ois further improved using some corrections for other effects and is embedded
1 K; P, ~0 D1 c7 U/ y$ \* gin a decision flow chart of a design procedure. More insight and better
, f( M% g2 Z1 j# }accuracy is provided in the other chapters. We invite the readers to let them
$ G4 O' X4 m& J; F9 \guide by the contents of the book to their specific subjects of interest.; d6 z# S3 t7 a' A9 K6 B- T# X
The chapters in the book are organized in a quite independent way with, W) X& {3 h0 s* W( d& G8 d h
respective local appendices and references. The general appendices at the
- {% B- o6 p& S8 _end provide information that is not linked to a specific chapter and can be
: Q4 X6 [, n: _( @4 q: P2 yused independently.0 L, |4 Z ~# j6 Q: r2 C
This work can be seen as complementary information to books on power) a* I# ?* w* T% F5 f
electronic circuits. Different levels of complexity are proposed depending on6 ]; c, K; K4 c+ p! a1 }
the available time, the desired accuracy, and the mathematical level of the
T: G8 Q! m5 z9 w3 }designer. |