12
Block diagram
legend
(continued)
(6) Transistors:
The transistors carry the intermediate circuit voltage in intervals at high frequency
to the primary coil on the transformer. The high frequency means that
- The transformer can be built very easily and compactly.
- Thermal losses due to the low inductivity required of the transformer coils can
be kept to an absolute minimum.
(7) Welding transformer:
- Transforms the high primary voltage into a low secondary voltage.
- Ensures electrical isolation of primary and secondary power modules.
(8) Secondary rectifier:
Converts the secondary voltage into a direct voltage.
(9) Output choke:
smooths the output current.
(10) Welding current sensor:
Registers the present actual current for the welding process.
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