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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: _ h% o" j7 z0 L% b( O
3 a( S) l5 \; h6 j# K( \- {
This book is mainly intended for designers and users of magnetic components
; z* z& k! L; x! ~in power electronics. It can also be used for didactical purposes. Magnetic
; O; B& ?. z1 @% p$ f: bcomponents such as inductors and transformers constitute together with the
5 P/ L# \# ~8 Y! |- a8 ?control and the semiconductor components, the main parts in the design of) W+ x" q" w( |- w
power electronic converters. Some experience teaches that the design of the
; J% F+ g( T, q( M4 Vmagnetic parts is still often done by trial and error. This can be explained by
" B) |) d: p* U2 O* B+ ^a (too) long working-in time for designing inductors and transformers. The% w( j1 N2 I) Z" U( I' Z; k) `
design has many aspects, such as the magnetic core and winding, eddy currents,
0 w% y- R5 a1 d. R! Einsulation, thermal design, parasitic effects, and measurements. A lot of
- Y$ Z" ?: S" sliterature exists concerning those subjects, but the information is spread over
! B5 f0 Q7 t( z( umany articles and methods. This book is mainly focused on classical methods
0 p$ R" l3 A1 L2 h7 d; I9 ]and uses numerical tools such as finite element methods in the background.. u" J& }7 o0 M8 B" W Q5 }
We try to give some overview of the basics and technological aspects of the
* z; h) z2 o/ H' ydesign. In the different chapters we also describe analytical approximations* ]' n& G' {! c8 W
based on known analytical solutions, but tuned by finite elements. In most
& b5 I" n% k8 g9 yof the cases, a sufficient accuracy can be obtained and the results are obtained7 e" |, _# t( H# F
almost instantaneously, even for graphics using many calculation points. A7 g; `2 ^; o) c. t1 T2 a
fast approximation method is useful as a first step in the design stage, whereas: V7 t% T- U2 C$ k }
numerical tools such as finite elements are good in analysis. Specific books
/ V) H, c% m% hon finite elements exist and the description will not be repeated here.
; t m7 e% n7 E; k oSome basic introduction on magnetic principles and materials are given, Y+ w7 D" `9 t. _- o6 w7 k" V( q
in Chapter 1.
# p/ t9 Z d' B+ Q! I- W. QToday power electronics use quite a high switching frequency.3 l' q# W, Z# z8 H3 h5 h
Simple rules
' F1 n& B) U5 y& g% [1 qof thumb such as that “the eddy copper current losses are always negligible# j s9 l2 i |
when the diameter of the wire is smaller than the penetration depth” are not
8 S% E( q L6 ptrue. However, it is clear that the main cause of the eddy current losses is* {2 b2 J8 |- e
caused by the presence of high frequency transverse magnetic field components.: W/ z; l( h! h- e# o4 g& p
This is the base of the fast design method in Chapter 2. The method
r1 X+ Z; W, K4 E& d7 B6 v8 ~. Fis further improved using some corrections for other effects and is embedded
& r, k. `. n1 S, \& P- t9 Min a decision flow chart of a design procedure. More insight and better# X5 u& s, x/ ]( t' ~) v) a
accuracy is provided in the other chapters. We invite the readers to let them: S- j& h# a$ m9 a
guide by the contents of the book to their specific subjects of interest.
, W- |) j! p& mThe chapters in the book are organized in a quite independent way with1 ]1 z$ E1 z: \2 m M7 g
respective local appendices and references. The general appendices at the2 [( R7 L$ O- p1 v3 B
end provide information that is not linked to a specific chapter and can be2 `6 K3 \+ I. `" H. C' l% z
used independently. p# J. Q$ t0 M
This work can be seen as complementary information to books on power
* k5 o0 R3 ^- \electronic circuits. Different levels of complexity are proposed depending on
) k8 H& z5 ^: d# athe available time, the desired accuracy, and the mathematical level of the1 a0 U# a! Q i: t; G# _! J* R
designer. |