SUMMARY
8
§2.2 Working Principle
The working principle of SANARG 180AP welding machines is shown as the following figure.
single-phase 120/240V work frequency AC is rectified into DC
, then by PFC circuit, DC(about
380V)
, then is converted to medium frequency AC (about 44K Hz) by inverter device (IGBT module),
after reducing voltage by medium transformer (the main transformer) and rectifying by medium
frequency rectifier (fast recovery diodes), then is outputted DC or AC by selecting IGBT module. The
circuit adopts current feedback control technology to insure current output stably. Meanwhile, the
welding current parameter can be adjusted continuously and steplessly to meet with the requirements of
welding craft.
Rectif
ier
Invert
er
Trans
forme
r
Rectif
ier
Hall
devic
e
Current feedback
control
DC
AC
DC
AC
Invert
er
AC or DC
Control signal
AC or DC
t
120-240V,
50/60HZ
single-phase AC
PFC
DC
§2.4 Volt-Ampere Characteristic
SANARG 180AP welding machine has an excellent volt-ampere characteristic, whose graph is
shown as the following figure. The relation between the conventional rated loading voltage U
2
and the
conventional welding current I
2
is as follows:
When I
2
≤600A
，
U
2
=10+0.04I
2
(V); When I
2
＞
600A,U
2
=34(V)
50
34
10
0
600
I
2
（
A
）
U
2
（
V
）
Working
point
Volt-ampere characteristic
The relation between the
conventional loading
voltage and welding current
