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§2 Technology Parameters
2.1 Working principle of main circuit
The working principle of SKYCUT 660 Air Plasma Cutting Machine as shown in the following figure.
Three-phase 220V work frequency AC is rectified into DC (about 530V), then it is converted to medium
frequency AC by inverter device, after reducing voltage by medium transformer (the main transformer)
and rectified 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 cutting current parameter can be adjusted continuously and step less to meet with the
requirements of cutting craft.
Rectify
Inverter
Medium
frequency
transformer
Medium
frequency
rectify
Hall device
Current positive-
feedback control
Three-phase, AC
DC
AC
DC
380V 50Hz
AC
DC
fig 2.1 Working principle diagram