THEORY
A MODEL BLOCK DIAGRAM OF MACHINE
Filter / Snubber
Inductive Filter
3-Ph Bridge Rectifier
MCB for ON/OFF
& Protection
Power ON
Soft Starter
DC CAp.
IGBT Bridge.
Main Transformer
Output Rectifier
DCL
OUTPUT TERMINALS
Current Sensor
Control Transformer
IGBT DRIVER
IR series welding machines are based on inverter technology by which the
50/60 Hz input supply is first converted to DC by diodes, then filtered by
electrolytic capacitors for ripple free pure DC volts, then this DC volts are
inverted to medium frequency (20KHz) AC, then step down by small
efficient transformer, then re-converted to Low volt DC suitable for
welding.
Control PCB
3
