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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
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" U& ? w9 ]* G4 A D- HThis book is mainly intended for designers and users of magnetic components2 A+ i- m' i9 U+ H' n) |
in power electronics. It can also be used for didactical purposes. Magnetic
+ r H E) B k% ocomponents such as inductors and transformers constitute together with the
" F' o$ \1 S9 @! _% `( Ucontrol and the semiconductor components, the main parts in the design of7 [% B- |3 z, H7 K C
power electronic converters. Some experience teaches that the design of the
1 Q `8 D. Y+ g1 Dmagnetic parts is still often done by trial and error. This can be explained by
- @5 I( H4 f' O' q/ T5 o, n5 Q# j4 Wa (too) long working-in time for designing inductors and transformers. The
6 F7 r1 O* h5 D, i7 udesign has many aspects, such as the magnetic core and winding, eddy currents,
3 _' X5 d9 c/ Q" O1 w/ W$ xinsulation, thermal design, parasitic effects, and measurements. A lot of8 b( D# v0 ~% f) D% O0 I* k+ X3 B
literature exists concerning those subjects, but the information is spread over) }/ v4 B9 I. W5 m3 F
many articles and methods. This book is mainly focused on classical methods2 r% z+ D! O% }; b
and uses numerical tools such as finite element methods in the background.' ?7 E% Q1 T: U' d7 }
We try to give some overview of the basics and technological aspects of the
# y" e6 G6 A, Z p+ N( O/ Ndesign. In the different chapters we also describe analytical approximations! b" ?) I+ q' P& {4 \9 I5 @* S
based on known analytical solutions, but tuned by finite elements. In most
. n& \6 t/ o w$ h; ?of the cases, a sufficient accuracy can be obtained and the results are obtained
+ M& R% f( }6 I" ]: \; Zalmost instantaneously, even for graphics using many calculation points. A
. W" v6 U, z6 d( T( }5 {fast approximation method is useful as a first step in the design stage, whereas0 M' S/ t. `5 @$ T6 h
numerical tools such as finite elements are good in analysis. Specific books9 z$ Y5 D) S: Q+ ]! l
on finite elements exist and the description will not be repeated here.% u; {5 ^2 S( b
Some basic introduction on magnetic principles and materials are given
- J2 v, n* D% P8 `# kin Chapter 1.
S7 p, P, f7 EToday power electronics use quite a high switching frequency.
" u) j4 ^/ B qSimple rules
) c# ?' o* t' S5 F: y* kof thumb such as that “the eddy copper current losses are always negligible
3 K0 i6 g/ \. R; lwhen the diameter of the wire is smaller than the penetration depth” are not) L# N4 g' G7 n
true. However, it is clear that the main cause of the eddy current losses is1 V5 |, N% Y! Q- {0 U" o
caused by the presence of high frequency transverse magnetic field components.; F1 v0 ?% N7 N; h' v, R1 U
This is the base of the fast design method in Chapter 2. The method
9 v- _ |4 L! m, l2 Lis further improved using some corrections for other effects and is embedded0 R3 W/ s6 c7 B+ o9 k- \
in a decision flow chart of a design procedure. More insight and better, b& ]5 ^* I8 V. p. ]. t/ t" |5 i6 }0 ]
accuracy is provided in the other chapters. We invite the readers to let them
& R2 U2 P# c G& g0 Lguide by the contents of the book to their specific subjects of interest.4 I, X j3 }/ s
The chapters in the book are organized in a quite independent way with
' T/ R# U; A7 P/ |8 Drespective local appendices and references. The general appendices at the+ G9 V2 B6 P6 a/ X
end provide information that is not linked to a specific chapter and can be; ?9 m2 }) ], e8 G- X; t1 A
used independently.3 E9 @. t7 w& @) L+ w6 ^( P
This work can be seen as complementary information to books on power
: T) o. w6 b& X$ U( s- pelectronic circuits. Different levels of complexity are proposed depending on
3 [: V9 c* u8 W9 ^9 s* xthe available time, the desired accuracy, and the mathematical level of the$ f8 r$ Q# e' \+ s% f, h; E7 c
designer. |