Snubber circuits for power electronics

Table of contents
PREFACE  7
ACKNOWLEDGEMENT  11
CHAPTER 1  13
An Overview Of Snubbers  13
What is a snubber?  21
Classifying snubbers  22
Snubber trade-offs  24
CHAPTER 2  25
Things You Need To Know About Switches  25
The ideal switch  25
A generalized switch concept  27
Real switches  27
Switch operating quadrant  30
The load-line concept  31
SOA concept  32
Derating and SOA  34
Switching scenarios  35
Resistive load switching  35
Clamped inductive switching  37
Unclamped inductive switching  45
Capacitive switching  48
Switching with real loads  51
Effect of parasitics on circuit waveforms  52
Unintentional overlapping conduction in switches  56
Lack of desired overlapping conduction  60
CHAPTER 3  61
RC -snubbers  61
Examples of RC-snubber use  61
A closer look at RC-snubber behavior  69
Finding the optimum value for Rs  72
Choosing Cs  76
A design example  80
CHAPTER 4  87
Dissipative RLC-diode snubbers  87
Basic circuit  88
A Turn-off snubber  90
Parasitic inductance and the turn-off snubber  102
The turn-on snubber  104
Turn-on snubber with a real diode  112
The combination snubber  118
A simplified combination snubber  122
Waveform discontinuities  126
Choosing the initial snubber component values  128
Snubber interactions  136
Non-linear Ls and/or Cs  147
CHAPTER 5  151
Energy recovery snubbers  151
A turn-off snubber example  152
Turn-on snubber example 1  164
Turn-on snubber example 2  184
Combination energy recovery snubbers  189
Combination snubber example 1  191
Combination snubber example 2  193
A flyback converter snubber  215
Energy recovery snubbers for bridge connections  222
CHAPTER 6  225
Component selection and circuit layout  225
Diode selection  227
Ls design  228
Cs selection  231
Rs selection  235
Effect of parasitic L on snubber behavior  239
Package and layout inductance  243
Comments on measurements  246
One final reminder  252
CHAPTER 7  253
Bare Bones Snubber Design  253
Getting started  254
Example circuit  255
Circuit waveform and power loss survey  257
Example 1, an RC-snubber  263
Example 2, another RC-snubber design  267
Example 3, more RC-snubber  269
Example 4,a turn-off RC-diode snubber  272
Example 5, a combination turn-on and turn-off snubber  279
Example 6, an energy recovery snubber  284
Component values  291
Summary  294
TECHNICAL LITERATURE BIBLIOGRAPHY  295
SNUBBER PATENT BIBLIOGRAPHY  339
INDEX  345