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Inductors and Transformers For Power Electronics.part04.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 Electronics4 i! n$ n; B, n7 h6 j
/ C4 f& t) _6 u$ o) ~3 a# ~
This book is mainly intended for designers and users of magnetic components
5 L% S1 I g* Q) n1 U- p0 a8 }4 nin power electronics. It can also be used for didactical purposes. Magnetic
' }. t. n8 q/ u8 [components such as inductors and transformers constitute together with the2 E, _8 o7 g) L3 T7 v/ H% t8 ?
control and the semiconductor components, the main parts in the design of* A0 Z- |" z* j8 _8 _
power electronic converters. Some experience teaches that the design of the
1 }2 t; u* P3 B% l/ a8 B* Z4 Zmagnetic parts is still often done by trial and error. This can be explained by+ D* q( m1 ]6 S. D( k1 p: h
a (too) long working-in time for designing inductors and transformers. The
* ]4 F; [7 z/ R. Z o: w$ o, f2 `4 qdesign has many aspects, such as the magnetic core and winding, eddy currents,
$ \, h3 J/ n t9 I, ?insulation, thermal design, parasitic effects, and measurements. A lot of
9 z3 ^, ~2 M$ p; n% L: W. Mliterature exists concerning those subjects, but the information is spread over
0 `( {+ z- t2 S7 Nmany articles and methods. This book is mainly focused on classical methods
; Y- o9 w+ @% A9 a) d, Gand uses numerical tools such as finite element methods in the background.8 t3 d* @! Z& U
We try to give some overview of the basics and technological aspects of the
9 K# I2 a3 d# a$ |$ b- Wdesign. In the different chapters we also describe analytical approximations
; X( s1 c6 d2 a! Obased on known analytical solutions, but tuned by finite elements. In most& S+ v3 a* A0 c: j2 e
of the cases, a sufficient accuracy can be obtained and the results are obtained u" x+ b; q4 X3 l
almost instantaneously, even for graphics using many calculation points. A, R1 ~$ T2 c1 [* U9 X& f& P
fast approximation method is useful as a first step in the design stage, whereas0 H9 T7 q# a# O, E
numerical tools such as finite elements are good in analysis. Specific books! I0 P/ p; R) k' M, k
on finite elements exist and the description will not be repeated here.( y2 o7 k4 w7 E
Some basic introduction on magnetic principles and materials are given
7 F% @0 X: m* F$ tin Chapter 1.
1 C$ b/ `. N. H& X$ G' Z' W2 S8 uToday power electronics use quite a high switching frequency. S0 n8 g: ]' v' c5 v( Z, T
Simple rules/ z& m: t+ G6 [/ b5 ?' g
of thumb such as that “the eddy copper current losses are always negligible* o: C1 l1 j: u
when the diameter of the wire is smaller than the penetration depth” are not
3 B X) Q1 h: p4 u+ \# C! Btrue. However, it is clear that the main cause of the eddy current losses is
1 R& z" f5 \. W4 V: `- qcaused by the presence of high frequency transverse magnetic field components.
- Y) k# n- f J* E4 S; V# H% g bThis is the base of the fast design method in Chapter 2. The method% ^+ e' b3 Z' X( e( k, ?4 @6 n" ^
is further improved using some corrections for other effects and is embedded
7 x: D) q7 J9 C$ _$ gin a decision flow chart of a design procedure. More insight and better, D1 V2 n: d: G7 ?! {9 N: l2 m' }
accuracy is provided in the other chapters. We invite the readers to let them
' `3 ]" t* c- Z9 E( x0 zguide by the contents of the book to their specific subjects of interest.
" C" ~) W* Z1 _The chapters in the book are organized in a quite independent way with' h% K3 ?+ Q ^# j8 f9 b8 K' X
respective local appendices and references. The general appendices at the* `6 _1 [/ k, U& [# N) n
end provide information that is not linked to a specific chapter and can be
9 k6 ]1 u. R4 P b+ @( ?used independently." V7 G; I4 D% b2 t
This work can be seen as complementary information to books on power# E. f: Z1 }1 Q5 B) T5 i+ U
electronic circuits. Different levels of complexity are proposed depending on" b% W4 ^, s7 `) g- a( v, h: Z
the available time, the desired accuracy, and the mathematical level of the6 ?8 i0 c- E. H" q
designer. |