22 IT 1002 Order No BA 93-66-1206 Issue 03.11.08
4 Function
In this chapter you learn more about the design of the power unit and how to
use the various setting options.
4.1 Components of the Power Unit
4.1.1 Power Unit
The power unit consists of the main assemblies
1 - Mains switch 6 - Control unit
2 - EMC-filter 7 - IGBT switch
3 - Bridge rectifier 8 - Middle-frequency transformer
with diodes
4 - Electrolytic capacitors 9 - Welding current stabilizer
5 - Control unit
After passing the mains switch (1) and the EMC-filter (2), the mains alternating current
is converted in the bridge rectifier (3).
The rectified voltage is smoothed by the electrolytic capacitors (4) and transferred to the
IGBT switches (7). These switches convert the direct current into a high-frequency
alternating current of 30 kHz.
The energy is transferred via the middle-frequency transformer with diodes (8) and
rectified.
The stabilizer (9) smoothes the current and passes it on to the welding sleeves.
Control of the IGBT switches (7) is carried out by the control unit (6).
4 Function
4.1 Components of the Power Unit
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