Section E-1 Section E-1
POWER WAVE 355/405
Theory of Operation .............................................................................................................Section E
General Description ....................................................................................................................E-2
Input Line Voltage, Auxiliary Transformer and Precharge...........................................................E-2
Switch Board and Main Transformer ..........................................................................................E-3
DC Bus Board, Power board and Control Board .......................................................................E-4
Output Rectifier and Choke ........................................................................................................E-5
Thermal Protection .....................................................................................................................E-6
Protective Circuits.......................................................................................................................E-6
Over current Protection ........................................................................................................E-6
Under/Over Voltage Protection ............................................................................................E-6
Insulated Gate Bipolar Transistor (IGBT) Operation ...................................................................E-7
Pulse Width Modulation..............................................................................................................E-8
Minimum/Maximum Output..................................................................................................E-8
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
