Kemppi MasterTig AC/DC 2000 Service Manual page 13

Operation principle
The main transformer T001 secondary voltages are rectified with a full wave rectifier V4 and
the current type (DC+, DC- or AC) is chosen by IGBTs V5 and V6. Secondary circuit current is
measured by shunt resistor R001.
T001
When the current type is DC+, is IGBT V5 conductive.
T001
When current type is DC-, is IGBT V6 conductive.
R001
T003
V5
U
G5
V4
V6
R001
T003
V5
V4
V6
U
G6
TIG
TIG
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