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首页IGBT Modules – Technologies, Driver and Applications
英飞凌工程师写的 英文版 本书首先介绍了IGBT的内部结构,然后通过电路原型或基本模型推导出的IGBT变体形式。在此基础上,探讨了IGBT的封装技术。本书还讨论了IGBT电气特性和热问题,分析了IGBT的特殊应用和并联驱动技术。这些分析还包括了IGBT的实际开关行为特性、电路布局、应用实例以及设计规则。
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Andreas Volke and Michael Hornkamp
IGBT Modules
Technologies, Driver and Application
The authors and publisher have meticulously prepared all the illustrations, tables,
equations and text
in
this book, but absolute perfection cannot be guaranteed. Neither
the
publisher nor the authors shall be liable on any legal grounds whatsoever.
All consequences
of
the use or practical implementation
of
the material published
in
this
work shall affect only the user. The authors and publisher cannot be held responsible for
any such consequences.
Consequently, the authors and publisher accept no responsibility and no liability arising
from the use
of
illustrations, tables, equations or text
in
this book, or parts thereof, for
any purpose whatsoever.
The terms used
in
this book may be trademarks, the use
of
which may infringe the rights
of
the proprietor.
Publisher: lnfineon Technologies AG , Munich
ISBN 978-3-00-040134-3
Second Edition, 2012
(c) 2012 by
lnfineon Technologies AG.
The work
itself and all its parts are subject to copyright.
Any use outside the narrow boundaries
of
copyright law, without the consent
of
the
publisher,
is
not permitted and
is
liable to prosecution. This applies especially to
reproduction,
translation, microfilming, digitalisation and any other type
of
editing, as
well as to storage and processing
in
electronic systems including publication on the
Internet. It also applies to the extraction
of
individual illustrations, tables
or
equations
and the use
of
excerpts
of
text.
Printed
in
Germany
Preface
Since their
development
in
the 1980s, IGBTs have become established as the standard
component
in
many different power electronics applications. They cover a performance
range from a few hundred watts to several megawatts.
In
the course
of
their
development, different IGBTs have separated out into different packages so that, for
example, there are now IGBTs as discrete components in, for example,
T0-247
packages, IGBT
in
high-power modules, and complex designs that include both IGBTs
and other electronic components and functions.
The aim
of
this book
is
to make the basics specific
to
IGBTs as they interact with the
application accessible to readers.
In
many published works, practical details and expert
knowledge are often left out or are not presented
in
a way that clearly shows how they
relate to the application. This book brings together detailed information about power
electronics
in
relation to IGBTs, supplemented and complemented by our own
experience
in
the field.
After explaining the internal structure and the IGBT variants derived from the
prc:;>totype
or
basic model, we then examine how the package technology
is
constructed. Then, the
book discusses electrical and thermal matters, getting to grips with gate drives for
IGBTs, including their specific application and parallel connection. This broad coverage
of
the applications also includes the practicalities
of
the switching behaviour
of
IGBTs,
basic circuit arrangements, application examples, and rules
of
design.
To
complement
that, we also look at measurement engineering and signal electronics. The conclusion
deals with the requirements
of
IGBTs and IGBT modules
in
terms
of
quality and
reliability.
In
presenting each chapter, we have tried as far as possible to present information
visually and avoid using more equations than necessary. There are more than 500
figures and tables. However, equations are used if they are the best way to explain
basic principles
or
are relevant to the everyday use
of
IGBTs.
We
hope thereby to have
achieved a good balance between pure theory and practice-oriented application.
We owe a particular debt
of
thanks to our families and friends , as work on this book -
during our already limited leisure
time-
took several years.
We
would also like to thank Professor Leo Lorenz, Jost Wendt, Hubert Ludwig and
Martin
Hierholzer, as well as lnfineon Technologies, for their support
in
making this book
a reality.
Warstein, summer 2010
Andreas Volke
Michael
Hornkamp
Although utmost care has been taken to ensure accuracy
in
presentation and content,
no
work can claim
to
be error-free and complete. Therefore, suggestions for
improvement are
cordially welcomed.
Preface
The arrival and consistent development
of
MOS-controlled power semiconductor
components has helped the entire field
of
power electronics towards a breakthrough
regarding high power density and system efficiency. It has also improved reliability and
made economical technical solutions possible. The key technology, facilitating the wide
power range
of
a few tens
of
watts up
to
the region
of
many megawatts, has been the
IGBT (insulated gate bipolar transistor), the exceptional technical properties
of
which
mean that it has replaced all previous fully controllable power semiconductor
components
in
existing systems and opened
up
completely new fields
of
application.
However, a fundamental understanding
of
component technology, the requirements
of
the fields
of
application and operation, and tried and tested designs for the drive and
protection functions, are essential for fail-safe and reliable operation across the entire
power range, and
in
order to take the optimisation of system costs into account.
An analysis
of
the literature currently available reveals a large number
of
highly qualified
papers and books
on
the topic
of
power electronics converters, switching topologies and
systems, and several comprehensive works that present the semiconductor physics and
cellular structures
of
the major new power semiconductor components both
in
theory
and from the technological and realisation point
of
view.
What makes this book unique
is
that
it
is
tailor-made to fill the gap that still existed
between semiconductor physics and power electronics systems technology, and
provides valuable support to users
of
these components.
Given the work done
in
this area over the last twenty years, the two authors, who were
involved
in
applying and spreading this new technology, deserve special commendation:
They did not balk at the effort
of
putting all the knowledge gathered so far
in
readable
form. By fortunate coincidence, both authors have been involved
in
developing
innovative application guidelines for the whole spectrum
of
power
JGBTs
and are
familiar with - indeed helped to shape - major drive and protection designs,
measurement methods for high performance
JGBTs
and many applications.
This book will provide students
of
power electronics with valuable information about the
main contemporary power semiconductor components and their application while
development engineers targeting power electronic converters will find all the essentials
of
selecting, dimensioning and applying IGBT modules laid out clearly and
comprehensively.
I would like
to
thank the authors for their hard work and express my hope that this book
will become a new milestone and a standard work
in
the development
of
energy
electronics.
Munich, summer
2010
Professor Leo Lorenz
IEEE Fellow
Member
of
the Academy
of
Science
Contents
1 Power semiconductors ........................................................................................ .. 1
1.1
Introduction ..............
..
..................
..
........
...
.
...
.............
..
................................
..
...
1
1.1.1
Intrinsic charge carrier concentration .............
..
............. ..
...
..
............... ....... 2
1.1.2 Doping ........ .
...
.
...
..
.........
..
..................... ......
..
....
..
...........
.. ..
.
..
.
..
.................. 6
1.1.3
Charge carrier movement
in
the semiconductor .....................................
...
8
1.1.4
Charge carrier generation and recombination .... ....... ..
..
.
..
........................
11
~:
~
:
~
~~~~~~~~~
:::::
::
::
:
::::::
::::
:::
:
:::::
::
::::
::::::::
::
::
:::::
::
:::
:
::::
:
:::
::
:::
::
:
:::
::
:::
:
:::
::
::
:
::
::
~
~
1.
1.
7 Manufacturing process .... .
.. ..
.................. ....................... ..... .
..
.......
..
.... .... . 18
1.2 Diodes ....
..
...
..............
..
..............
...
.............................................................
..
.... 23
1.2.1 Fast
re
covery diodes .......
.. ..
...
........
..
..
.....
...
..
........
..
.. ..
........
..
...
..
...
............ 24
1.2.2 Mains (rectifier) diodes .... ...
...
.....
.. .. ..
.
..
..
.. ..
...
.......
...
.. ..
.............. ....... .
...
.
...
26
1.2
.3
Schottky diodes .... .
...
.
...
..
.
...
....
...
.
...
....
..
.
...
......
..
...
..
.
..
.
..
.
...
..
.....
..
..
..
...
..
.... .
..
26
1.2.4 Z-diodes and avalanche diodes .............
...
....
...
..
...
.. ..
...... ................... ...... 28
1.3 Thyristors ..... .
..
....
..
............. ......
..
............
....
...
...
.........
..
..
...
..........
..
...
...
...
...
. :
..
.
..
30
1.4 Bipolar junction and field effect transistors
..
...
..
.....
..
....
..
.....
..
...
.
..
....
..
.......
..
..
.... 31
1.4.1 Bipolar junction transistors (BJTs)
...
.. ..
..........
..
..
..
..
..
....
..
...
..
...
..
..
.
...
..
.
...
.
...
31
1.4.2 Field effect transistors (FETs) .......
..
.
..
..
.. .. .. .. ..
.
.. ..
.........
...
..
..
...................
..
34
1.4.2.1 Junction field effect transistors (JFETs) ...
..
..... ......
...
..
..
.......
...
.... .
.. ..
..
34
1.4.2.2 Metal oxide semiconductor field effect transistors
(MOSFETs)
...
..
... 35
1.4.2.3 Superjunction MOSFETs .
.. ..
...
.....................
..
.......
..
..........
..
.....
..
.. ..
...
38
1.5
Insulated gate bipolar transistors (IGBTs) ...... ........................ ..... ..........
..
...
..
... 39
1.5.1 Punch through (PT)
JGBTs
.....
.. ..
..
..
...
.... .............
..
............
...
.
...
.
..
............. 46
1.5.2 Non-punch through (NPT)
IGBTs
..
......................
..
..
..... .
...
.. ..
.
..
...........
..
...
48
1.5.3 Fieldstop
(FS) IGBTs ...................... .
..
........
..
......................
..
............ ........ 49
1.5.4 Trench
IGBTs ....
..
..... .
...
...... .......
..
...
..........................................
..
.
...
......... 50
1.5.5 CSTBT
TM
..
..
...
.......
...
..
...
.
..
.
..
.......
..
..
...
..
.
..
.
.. ..
..
..
.....
..
...........
..
...
..
...
....
..
..
..... 52
1.5.6 IEGTs
...
..
......
..
...............................................................
..
.
...
.
...
...... ......
..
.. 53
1.5.7 Trench-FS
IGBTs ..... ..
..
...
.
...
.. ..
.....
...
.
...
.. .. ..
...
...
...
.. ..
........
.. ..
......
....
..
...
.
.. ..
..
54
1.5.8
RC
IGBTs .....
..
.... .....
..
.
..
...............
..
...
..
..
.
..
...
.........
..
.
..
................
..
.
..
..
......
..
55
1.5.9
Integrated additional functions ............
..
.................... .... .... .................... .
..
55
1
.6
Outlook .... .
...
........
..
.............. .......... .... ......... .
..
..... ..... .
..
...........
...
..... .
....
.
..
...
.
.. ..
. 58
1. 7 Manufacturers .......
...
...
..... ....... .
...
.
..
........ .
....
.
..
...
..
.
..
......................
..
...
....... ..
..
.
..
62
1
.8
References
...
.......... ....................... .......... ........... ...
.. ..
... ...
..........
..
......
..
........
...
63
2 Construction
of
IGBT components ..................................................................... 66
2.
1 Introduction
...
...
..
....... ...
....
.
...
...... ........ ......................
..
......
..
..
.
...
..
.
..
.
.. ..
.
..
....... .
..
66
2.2 Materials for the construction
of
IGBT modules
..
..
..
...
...... ..
..
....
...
...........
..
.....
..
67
2.2. 1 Plastic frame ..... .
..
..
..
..
...
..
..
..... ..... ......
..
.
..
.......
..
........
..
..
...
..
..
.....
...
...
........... 68
2.2.2 Substrates
..
....................
..
..
..
...
.
..
.
.. ..
...
.
..
.......... ..
..
..
.
..
..... ......... ......
..
........
..
69
2.2.3 Baseplate ...... ....
.. .. ..
........
.. .. ..
..
...
.... ...
...
..
.........
..
....
..
...
...
..
.....
..
....
..
......
..
....
71
2.2
.4
Moulding compound, epoxy resin and silicone gels
..
...
..... .
..
..
.. ..
.
..
..
..
..
..
.
..
72
2.3 Electrical bonding technology .
..
......... .....
..
........................................ ........ .
..
.
..
74
2.3.1 Internal connection technology
...
......... .................
...
.
..
...
..
..... ......
.. ..
..
..
.
..
..
7 4
;
:;:
~
:~
~~~e:~~~r~~~i-~·9·:
::::::::
:
: :
::
:
:::::::::
:
::
:
:::::
:
::::
:
:::::::
:::
:::
::
::
:::
::
::
:
:::
::
::::
:::::
;;
2.3.1
.3
Ultrasonic bonding .........
..
...........
...
..
..
..
.
..
.
...
..
...
..
.....
..
......
...
..
......
...
.
..
. 75
2.3.1
.4
So
ld
e
rin
g .....................
.. ..
...
..
..
...
..
.........
..
....
..
.. .. ..
..
...
...
..
.......
..
..
... ...
.
..
78
2.3.1.5 Ultraso
ni
c welding .............
...
..
.........................
..
...
...
..
...
........
.. ..
........ 79
2.3.1.6 Low tem
pe
rature joining .....
..
.
..
.
...
...
......
..
...
.
..
.
..
...............
...
..
.
..
..... ..... 82
2.3.1.7 Di
ff
usion solder
in
g
.. ..
................ .
...
.......
...
.......
..
......
...
..
...
..
.
..
...
.... ...
..
.. 82
Contents
Contents
2.3.2
External bonding technology
..
.........
..
..
..
.......
..
.....................
.. ..
.
..
.....
.. .. ..
.
..
83
4.1
Introduction ........ .....
..
..
........... .....
...
.... .....
..
....
.. ..
.........
.. ..
.
...
..
.....
..
.......
.. ..
.......
161
2.3.2.1 The fritting effect
.. ..
.....
.. ..
.....
.. .. ..
....
.. ..
.. .. ..
.
.. .. .. ..
.......
.. .. .. ..
.
..
.... ....
..
.... 83
4.1.1 Definitions ......
..
....
...
.......
..
...
..
.... .
..
...
...
..
....
..
....
..
................
.. .. ..
.... ....
..
......
161
2.3.2.2 Screw connection ....
..
..
........................................... ........................
..
. 84
2.3.2.3
Solder connection
.. ..
..
..
....
..
...........
..
..............................
..
.... .............. 86
4.1.
1.1
Temperatures .................................................................................
161
4.1.1.2 Power ........................
.. .. ..
....................
..
........
...
.. ..
..
......................
..
161
2.3.2.4 Plug connections
..
...............
..
........
..
.............. ..... ...........
..
....
...
......
..
.
..
87
2.3.2.5 Press-in
technology .....
..
............
..
...
.......
..
.........
..
.
.. ..
....
..
...
....
.. .. .. ..
..... 88
4.1.1 .3
Thermal resistances and impedances .... .......
.. .. .. .. ..
..
.. ..
................ . 162
4.1.2
Thermal conduction
.. ..
....
..
....
..
................
..
........
.. ..
........
..
....
..
..
......
..
....
..
. 163
2.3.2.6 Spring contact
..
.........................
.. .. ..
......... ......
.. ..
.
..
..........
...
.... .........
..
92
4.1.2.1 Thermal resistance ................................
.. ..
.......... ....
..
..................... 163
2.4 Design concepts ......
..
...
..................
..
...
....
.. ..
...
...........
..
.
..
.............
..
.
..
..
.... .........
94
2.4.1 Standard IGBT modules ........................
..
.... ....... ......................................
94
2.4.2 Press pack IGBTs ....
..
..............
..
..................
.. ..
.. ..
..................
..
......
..
........ 94
2.4.3
Intelligent power modules (IPMs)
.. .. .. ..
..
......
..
..
..
.... ..........
.. .. .. ..
.......... ...... . 95
4.1.2.2
Thermal capacity ................
..
.... ....
.. ..
...............
..
..........................
...
164
4.1.2.3
Thermal impedance ..............
.. .. ..
.... ................
..
..
...
.. ..
........
.. .. ..
..
..... 166
4.1.2.4
Thermal lateral spread ..................
..
..............
..
....
..
.. .. ..
.. ..
................ 167
4.1.3
Thermal radiation .... .......... ......
..
....
..
..................... ............
..
...
.......
...
....... 169
2.4.4
IGBT moulded modules .....
..
..................... .... ...
..
.... .
..
...
.. .. .. ..
.
...
.......
.. .. ..
.... 97
4.1.4 Convection ................................ .........
.. .. .. ..
..............
..
.
..
..... .........
...
.. ..
.... 172
2.4.5 Discrete
IGBTs ..................
..
..............
.. ..
...
......................... ....
..
..... ..........
..
99
2.4.6 Stacks
...
......
.. ..
...................
.. ..
....... ...... ...
.. ..
........
.. ..
..
...
..
.......... .....
..
.... ..... . 99
2.5
Internal parallel connection
of
semiconductors
..
...................
..
.. ..
....
..
......
.. ..
... 1 00
2.6 Low inductance design ....................
..
.............................................
..
............. 1
03
4.2 Materials and their thermal properties ....
...
..
..............
...
.. .. ..
.... .............
.. ..
...... 173
4.2.1
Thermal Interface Material (TIM) ....
.. ..
......
.. ..
.
..
..
..
........... ....
.. ..
............... 176
4.3
Thermal model .....................................................................................
..
...
_.
..
. 178
4.4 Heatsink ...... ..
..
.................................
..
.....
..
..........
..
........................
.. ..
.
...
..
.
.. ..
. 185
2. 7 Circuit
topologies
in
IGBT modules
..
.. ..
..........
...
.. ..
....................
...
....
.. ..
..
....... 1 04
4.4.1 Air coolers
.. ..
....
...
...........
..
.... .
..
...........
..
........................................
.. ..
...... 186
2.8
Insulation coordination
.. ..
............................
...
.......... .
..
................ .......
..
....
.. ..
. 107
2.8.1 Clearance and creepage distances
.. ..
..
.......
..
.... ....
..
......
..
........
..
............. 108
4.4.2 Liquid cooling system
..
.... ............
..
..
..
..
.. ..
..
............
.. ..
.... ......
..
..
.............. 187
4.5 References
..
...........
..
...... .... .....
...
...... .... ..... ............ ........ ...... ................
...
...... 190
2.8.2 Insulation voltage .....................................................
..
......
..
................
..
..
111
2.8.3 Partial discharge ......
..
...................
..
.. ..
...............
..
...................
..
............. 112
5 Module datasheet ......
..
.......................
..
..............................................................
191
2.9 Overview
of
manufactures ......
...
......
.. ..
.. ..
.... ..... ................... ............... ........
...
113
2.10 References ......
..
.
...
..
.........
..
...
.......
.. ..
..
..
..... .
.. ..
.
..
.....
...
...
..
...
..... ................... 115
5.1
Introduction ..........
.. ..
...
..
......................
..
...
..
.... .... .... .
.. ..
.
..
.... ......... ..... ......
..
...
..
191
5.2 IGBT
...
.... ...
.. .. ..
.................
..
.
.. ..
.
..
..........
...
......
..
.........
...
..
.........
.. ..
...
.
...
.
..
..
..
.
..
. 192
3 Electrical properties ........................................................................................... 117
3.1 Introduction
...
................................. .
.. .. ..
........
...
..
.. .. .. .. ..
......
..
.... ..... .........
...
..... 117
3.1.1 Definition
of
terms .....
.. ..
......................
..
................
..
....................
..
......... 118
3.1
.1
.1
Voltages
..
......
..
............
..
..
........
..
....
.. ..
......
..
.. ..
.........
..
..........
..
....
..
..... 118
5.3
Freewheeling diodes ...... ......
..
..........
.. ..
....
..
...
..
.... .....
..
..........
..
...
.. .. ..
.............. 195
5.4 Rectifier diodes
(PIM/CIB modules) ..............
...
....
..
..
....
..
............ ................... 196
5.5 Brake chopper
(PIM/CIB modules)
.. ..
....
..
................
..
............. ..................
..
..
197
5.6 NTC resistor
(optional) ........................
..
..
............
..
........................................ 197
5.7
Module ........
...
.............
..
... ...
.. ..
...
.... .... .
... ...
........ ..................................
...
....... 198
3.1.1.2 Currents ..................
..
.
..
..
..
.. ..
............
.. ..
........................................... 119
3.1.1.3 Times
.. .. ..
..
......
.. ..
...........
..
..
..........
.. .. .. ..
.
.. ..
...
.......
..
.......................
..
. 119
3.1
.1.4 Temperatures
..
............
.. ..
......
..
..........
..
..
................
..
....
...
.... .... .........
121
3.1
.1.5 Energies ..................
..
....
..
.. ..
....
..
..
..
...............................
..
..
..
....
..
....
..
. 122
;
:
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g:~;~~~~~i~gi~~
· :
::
:
::
: :
::
:
:: :: ::
:
::
::::::::::::::
:::
: :
:::: ::::
::::
:
::
:::
::::::
::
:: ::
: : : : :
::
::::
::
: :
::::
::
~~~
5.10 Package (case) drawing ...........
..
........................ ......
.. .. ..
.. ..
..............
..
....
..
. 200
5.
11
References ...............
.. ..
...
......................
..
..................................................
201
3.1.1.6 Modulation factor ..................
..
.... ....
..
..................
..
................
..
......... 125
3.2 Forward characteristics
of
the diode
..
.. ..
...............
..
.....................
..
......
.. .. ..
.... 127
6 IGBT Driver ........................................................................................
..
............... 202
3.3 Diode switching characteristics
.. ..
..
......
.. ..
..
....................
.. ..
..............
..
..
......... 130
3.3.1 Diode turn-on
..
..
.......................... ..........
.. ..
..................
..
..
....................
...
130
3.3.2 Diode turn-off
..
....
..
....
..
.... ....
..
....
..
......
..
......
...
..
....
..
........
.. .. ..
....
..
.... ......
.. ..
132
3.4
IGBT forward characteristics .............. ...... ...... ...... .......
.. ..
............
..
......
.. .. ..
.... 137
3.4.1 Forward characteristics at
low temperatures ....
.. ..
.......................
..
......... 139
3.5
IGBT switching characteristics
..
......
..
..
.... ....
..
..............................
..
........
..
..
.... 140
3.5.1 IGBT turn-on ......
..
....................................
..
....
..
.......................
..
..
........
..
. 140
3.5.2 IGBT turn-off ..................................................
..
......
..
..
.... ...... .................. 143
3.5.3 Gate charge and
Miller effect
..
....
.. .. .. ..
............ ......
..
....
..
..............
..
.... ..... 145
3.5.4 Turn-off behaviour NPT versus Trench
IGBT switching characteristics .147
3.6 Short circuit behaviour ............................................................
..
..................
...
148
3. 7
Blocking behaviour ......
..
..... .
...
...
..
......
..
......
...
.... ........ ..
..
...
..
............................
151
3.8 Static and dynamic avalanche breakdown ....
.. ..
..
.... ..........
.. ..
........
.. .. ....
....
.. ..
152
3.9 Stray inductance .....
..
.
..
....
..
........... .
...
....
..
..
.
...
..
..
..
...
................ ....
......
..
....... ..... 155
3.10 Different manufacturing sources ....
.. ..
..........
..
..............................
..
......
.. ..
..
158
3.
11
References .................. ...................................
..
...
...
..
..
..
..
..
..
.
.. .. ..
...
..
...... .
.. ..
15
9
6.1
Introduction ...............
...
.
...
..
........
..
..........
..
.....
.. ..
...
.
...
....... ...... .............
.. ..
...... . 202
6.2 Signal transmission
...
......
.. .. .. ..
.
.. ..
............
..
...
..
.
.. ..
........... ....
..
........................ 203
6.2.1 Level shifter ................... ...............
..
.. ..
.... ..........
..
..
.. ..
...........
..
................ 204
6.2.2 Optocouplers ...... ......
..
.......
..
.......
..
...
.....
..
......................
..
....................... 208
6.2.3 Pulse transformers .................................. ....
..
...
...........
...
.......
..
...
............ 210
6.2.4 Capacitive couplers
..
.... ................
..
..
............
..
............
..
............
.. ..
..
....... 213
~
:
~
:
~
~i~~~~~c_s_
:::::::::
:::::::
:
::: ::: :::
::
:::
: :
::
: :
::::::
:
:
:
:
:
:::::
::
:
::
:
::
::::
:
:: ::
: :
:::::
:
:
::
:: ::
:::
::
:
:
~~ci
6.3 IGBT gate drives ........
..
..........................
..
....................
..
..
....
..
...
....
..
............
..
217
6.3.1
Voltage source drivers .................... ..........
..
........
...
.... .... ..........
..
....
..
...... 218
6.3.1.1 H-bridge circuit
.. ..
............
.. ..
................
..
.. .. ..
........
..
......................... 218
6.3.1.2 Emitter
follower
in
the gate path
.. ..
..............
..
......
.. ..
....................... 219
6.3.1.3 Emitter
follower
in
the emitter path .... ............... ......
..
..........
..
.. ..
..
....
221
6.3.1.4 MOSFET push-pull gate drives
..
..
............ ..................
.. .. ..
.
..
..
.... ....
..
222
6.3.1.5
MOSFET source followers
.. ..
............ .........
..
..
....
....
.. .. .. ..
................ . 224
6.
3.
1.6 n-channel push-pull drives ............
..
....
..
..
......
..
............. ................... 225
4 Thermal principles
..
.
..
...
....
....
.. .. ..
...............................................................
..
.......
161
6.
3.
1.7 IGBT gate boosting
..
.. ..
......
..
.......................................................
.. ..
226
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