Thermal Arc POWERMASTER 320SP, Руководство по обслуживанию

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page 5
Inverter Principle
A welding inverter is a electronically controlled welding power source. At conventional transformer based ma-
chines, the mains voltage with 50/60 Hz is directly switched to the welding transformer. At a welding inverter the
mains voltage is recti
fi ed fi rst and with electronic power switches (MOSFETs or IGBTs) chopped into a frequency
of 80 kHz. This allows a very small construction of the welding transformer, because it‘s driven at this high fre-
quency. The basic structure of a welding inverter is always the same:
mains recti fi er -
primary inverter -
transformer -
secondary recti fi er -
mains-
filter
3 phase mains
power-
up
primary
rectifier
primary
driver switch
transformer
secondary
rectifier