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Principle & Technical data
WT-DI Series Block Diagram Of Principle:
Figure 1: Block diagram of principle
This series welding machines apply IGBT HF inverter technology. Inputted line frequency 3-phase 380V
are rectified by rectifier, inverted into HF AC, reduced by HF transformer, rectified and filtered by HF
rectifier, then output DC volt or 50Hz AC square wave volt suitable for welding by second invert. After this
process, the welder’s dynamical responsive speed has been great increasing, the size and weight of
welder’s transformer and reactor are reduced noticeable. Power source enjoy sound anti-fluctuating ability
due to excellent circuit loop control.
Power source can reach their potential as well as easy arc-start, stable arc, pretty weld formation and
continuous regulation of welding current during external context changes (As to fluctuation in input power
supply and extended welding cables) due to reasonable control circuit design.
90-
10-
0
U
（
V
）
U= 10+0.04I
I(A)
Imin
Imax
90-
20-
0
U
（
V
）
U= 20+0.04I
I(A)
Imin
Imax
Figure 2: TIG mode Volt-Ampere curve Figure 3: SMAW mode Volt-Ampere curve
3 phases
Rectifier
Hi-frequent
inverter
Inverter
Hi-frequent
transformer
Rectifier
& filter
Control circuit
Hi-frequent
inverter
3~380V/50Hz
