page 6
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 rectified first 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 at Lorch power sources:
-
mains rectifier
- primary inverter
- transformer
-
secondary rectifier
mains
filter
3 phase mains
input
rectifier
primary
driver
transformer
secondary
rectifier
power
up
Summary of Contents for V Series
Page 1: ...Service Manual V Series 909 0340 1 05 ...
Page 47: ...page 47 ...
