SUMMARY
6
§2.2 Working Principle
The working principle of TP- series welding machines is shown as the following figure.
Single phase work frequency AC 220V or 230V (50 Hz) is rectified into DC (about 300V), then is
converted to medium frequency AC (about 20KHz) by inverter device (IGBT), after reducing
voltage by medium transformer (the main transformer) and rectifying by medium frequency
rectifier (fast recovery diode), and is outputted by inductance filtering. 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.
Rectify
Inverter
Medium
frequency
transformer
Medium
frequency
rectify
Hall device
Current positive-
feedback control
Single-phase AC
DC
AC
DC
220/230V,50HZ
AC
DC
§2.3 Volt-Ampere Characteristic
TP- series 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).
63
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
