Inverter And Output Sections - Lincoln Electric INVERTEC 300 TP Service Manual

INVERTER AND OUTPUT CIRCUITS,
MAIN TRANSFORMER AND
OUTPUT SECTIONS
The inverter board receives the rectified primary power
from the Preload Board (565Vdc) and it converts this
power from DC to AC high frequency that is applied to
the primary windings of the main welding transformer
(T2).
The primary winding of the main welding transformer
receives the Pulse Width Modulated power from the
switch board. The AC output that is created on the
secondary windings is applied to the output rectifier
circuit (located on the same board of the Inverter
circuits).
The resultant rectified DC- power is applied, through
an output choke, to the HF transformer and after to the
negative output terminal. The DC+ pass through the
current transducer and it is connected to the positive
stud.

INVERTER AND OUTPUT SECTIONS

The output choke provides filtering to enhance the arc
performance and accurate waveform response.
The current transducer provides an accurate feedback
of output current to the control circuits section of the
control board to obtain the correct output
characteristic.