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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/ ~/ l# F+ {3 n
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This book is mainly intended for designers and users of magnetic components! c- n1 r. Q4 U8 i
in power electronics. It can also be used for didactical purposes. Magnetic
& q' V1 d1 U& k9 ocomponents such as inductors and transformers constitute together with the
) e3 C1 F* q! Q; K. D3 l) Hcontrol and the semiconductor components, the main parts in the design of2 t# W _8 k1 v2 O
power electronic converters. Some experience teaches that the design of the
w. b r& F7 ?& o9 @0 T( Xmagnetic parts is still often done by trial and error. This can be explained by
5 \6 s2 Z F1 s9 ~" ?, _. na (too) long working-in time for designing inductors and transformers. The( \" ]5 U0 X" k m4 \
design has many aspects, such as the magnetic core and winding, eddy currents,' u- {, _9 m( S
insulation, thermal design, parasitic effects, and measurements. A lot of! | j! ?0 H; W# \
literature exists concerning those subjects, but the information is spread over
! W% z* k2 F" r# A! P% M0 Tmany articles and methods. This book is mainly focused on classical methods' @* l9 X8 R A+ V
and uses numerical tools such as finite element methods in the background.
( h/ M/ e8 Q/ g: p9 t' n$ D: bWe try to give some overview of the basics and technological aspects of the
- \; A! y( B# [8 W5 ?+ R( v$ Y7 ddesign. In the different chapters we also describe analytical approximations# q! f: A' X6 R
based on known analytical solutions, but tuned by finite elements. In most: y1 P) g0 H$ ^+ N4 f2 N2 b2 w
of the cases, a sufficient accuracy can be obtained and the results are obtained
# q: l( O& [( }1 ]& e3 e0 Q( kalmost instantaneously, even for graphics using many calculation points. A
9 Y* ]; Z' Q0 b" v" M* x/ {fast approximation method is useful as a first step in the design stage, whereas: n* L7 W+ o% B( ~ Z! q
numerical tools such as finite elements are good in analysis. Specific books
# B" H- ^6 s8 {" Z1 _% } Ion finite elements exist and the description will not be repeated here.
; F- j S0 a, [Some basic introduction on magnetic principles and materials are given. x' F5 ^' P. o7 C0 }+ v: }
in Chapter 1.9 B+ l& q1 i4 [3 \( ^" U
Today power electronics use quite a high switching frequency.- U1 |% @5 [7 ?6 y! M
Simple rules
3 ?8 s, ?" E1 I7 M# n. U' l2 yof thumb such as that “the eddy copper current losses are always negligible6 }/ C) {: G I" F7 ?: [
when the diameter of the wire is smaller than the penetration depth” are not
( i0 Q1 I [+ a% s+ E3 W( ptrue. However, it is clear that the main cause of the eddy current losses is
& Z+ T0 L ?1 m% pcaused by the presence of high frequency transverse magnetic field components.1 x7 f- z9 u- d( G1 h% b. [' z
This is the base of the fast design method in Chapter 2. The method8 k' z( @1 X# g3 k- N7 u; K. H2 @
is further improved using some corrections for other effects and is embedded7 O" J) w1 o4 y
in a decision flow chart of a design procedure. More insight and better1 L1 Z& y( n3 g! P1 }3 y n
accuracy is provided in the other chapters. We invite the readers to let them
2 O3 Y Y2 ~6 G; \guide by the contents of the book to their specific subjects of interest.
. ^$ ^! x$ P3 ^' ?2 H& s3 G* IThe chapters in the book are organized in a quite independent way with
! ^; I2 A8 [6 q8 M) R9 x5 z; A" Qrespective local appendices and references. The general appendices at the
6 Y/ k+ ?. [' b+ H# t3 r9 Wend provide information that is not linked to a specific chapter and can be, ^- D6 F! d) M2 \" `/ N$ |$ p# n' v
used independently.
: E8 ~' r( [/ q( t; c6 nThis work can be seen as complementary information to books on power
+ v3 J& s% e2 O9 A" {+ ^8 Celectronic circuits. Different levels of complexity are proposed depending on
: W: g' _& W Z/ `! p) B0 Z% Kthe available time, the desired accuracy, and the mathematical level of the
- {/ @- i- V# Z0 o! T, s3 y$ tdesigner. |