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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- ~, y% m% L, e4 a7 w: ?3 _$ B0 u
. ?6 S, I1 B$ o7 S/ VThis book is mainly intended for designers and users of magnetic components
6 X6 z/ @$ N7 r0 qin power electronics. It can also be used for didactical purposes. Magnetic
1 V1 d7 h. Z( a% l6 T* wcomponents such as inductors and transformers constitute together with the! A$ B. M, t x6 R' \/ f' ^
control and the semiconductor components, the main parts in the design of
/ T; f6 Z+ A% s/ y9 v% tpower electronic converters. Some experience teaches that the design of the. n/ o+ S9 b0 S1 P' |
magnetic parts is still often done by trial and error. This can be explained by; a Q9 T" q2 I7 X
a (too) long working-in time for designing inductors and transformers. The1 e3 ?& H7 O; w" i- r
design has many aspects, such as the magnetic core and winding, eddy currents,( o4 ~, }* E% t- ~# C; n, c& Z
insulation, thermal design, parasitic effects, and measurements. A lot of4 I& [1 F, j* M" S! i: Y
literature exists concerning those subjects, but the information is spread over, @2 r& Z: c V4 f3 v' l
many articles and methods. This book is mainly focused on classical methods" i+ l& t1 ~/ b3 t! n
and uses numerical tools such as finite element methods in the background.) \/ M' g6 j- u* L- ]
We try to give some overview of the basics and technological aspects of the. K4 y g% H: \8 m2 {/ s/ l1 c7 j
design. In the different chapters we also describe analytical approximations
1 o! c9 G$ F1 r G1 b9 \based on known analytical solutions, but tuned by finite elements. In most
, `7 N, [, b# lof the cases, a sufficient accuracy can be obtained and the results are obtained
- U+ S5 V" O( I0 m6 _almost instantaneously, even for graphics using many calculation points. A: s" W( m. v: _3 a+ h% Z& f$ F' a
fast approximation method is useful as a first step in the design stage, whereas- D/ K, @9 l/ i" P! k8 u
numerical tools such as finite elements are good in analysis. Specific books# Q+ Q, ^2 ]& e2 n/ m$ t
on finite elements exist and the description will not be repeated here.
4 k8 \& l8 [* q4 m* O' F# p FSome basic introduction on magnetic principles and materials are given: C3 k1 ^$ K1 U1 V
in Chapter 1.
0 ?; O# W+ J, F, _* ]4 D: dToday power electronics use quite a high switching frequency.$ Y! G, L. R' X8 q$ R# y; T1 x2 A
Simple rules( s3 W) l: z2 g5 c: k Q2 X
of thumb such as that “the eddy copper current losses are always negligible# l/ c& V# m6 f- u
when the diameter of the wire is smaller than the penetration depth” are not
; r, e* J+ N7 `/ w( G: I/ t' {true. However, it is clear that the main cause of the eddy current losses is
: C) E( J1 x& y, ?caused by the presence of high frequency transverse magnetic field components.- a& J9 v# u/ @- B6 ]
This is the base of the fast design method in Chapter 2. The method2 X( I: f, K" A/ u, a- C' M! o
is further improved using some corrections for other effects and is embedded
# X6 B% { _( J$ f9 I2 j* yin a decision flow chart of a design procedure. More insight and better
4 l, q5 D; k7 m- |; h1 D" e4 Naccuracy is provided in the other chapters. We invite the readers to let them
5 p1 S1 j, M+ y! Aguide by the contents of the book to their specific subjects of interest.2 _4 T8 w5 V; j- a7 I. V
The chapters in the book are organized in a quite independent way with; s/ l x5 x7 u- _1 u/ a2 g
respective local appendices and references. The general appendices at the& G$ P- p9 W" l) Q) h- v
end provide information that is not linked to a specific chapter and can be! F* t* w1 \$ I
used independently.
$ l& }# l7 Z6 |This work can be seen as complementary information to books on power
& Z/ Z3 F P, D) Z& u2 Yelectronic circuits. Different levels of complexity are proposed depending on1 g4 p( d0 ]' t2 Y
the available time, the desired accuracy, and the mathematical level of the# [/ R' [* ~, N3 E* `( z7 d* y, }
designer. |