Lincoln Electric INVERTEC 270SX Service Manual page 15

OUTPUT SECTION
Output Section
The output board receives the AC output from the
main transformer secondary windings and rectifies it to
a DC voltage level. Since the output choke is in series
with the positive leg of the output rectifier and also in
series with the welding load, a filtered DC output
current is applied through the machine's output
terminals.
Current sensor to the output board gives current
feedback to the control board.
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