5
2.1 Working Principle
The working principle of MIG160 is shown as the following
figure. Single phase work frequency AC 220V (50 Hz) AC is
rectified into DC (about 310V), then is converted to medium
frequency AC (about 44KHz) by the inverter device (IGBT),
after reducing voltage by the medium transformer (the
main transformer) and rectifying by the medium frequency
rectifier (fast recovery diodes), and is output by inductance
filtering. The circuit adopts current feedback control
technology to ensure current output stability. The welding
current parameter can also be adjusted continuously to
meet welding requirements.
Single Phase, AC
220V, 50HZ
Rectify
DC
DC
AC
AC
DC
Inverter
Medium
frequency
transformer
Medium
frequency
rectify
Hall device
Current positive-
feedback control
2.2 Volt-Ampere Characteristic
The MIG160 has an excellent volt-ampere characteristic,
displayed in the following graph. The relation between the
conventional rated loading voltage U
2
and welding current
I
2
is as follows:
When I
2
≤ 600A
，
U
2
＝
14
＋
0.05I
2
（
V
)；
When I
2
>
600A
2
，
U
2
＝
44
（
V
）
.
67
0
600
I
2
（
A
）
U
2
（
V
）
Working
point
Volt-ampere characteristic
The relation between the
conventional loading
voltage and welding current
14
44
160