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Welding machine (need circuit explain)

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LefTux

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Hello, i would like, if anybody know, to help me to understand the circuit of inverter welding machine. There are to points.
1. On the following picture i have marked on red cycle a ultra fast diode near to mosfets. What is the rule of this?
1.JPG

2. On the following picture i have marked on red cycle a group of 6pcs BYV52 diodes. What is the rule of these?
2.JPG

Thanks.
 

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It is hard to say without a schematic diagram.

In any case, the first picture seems to be a recovery diode, the diode that dissipates the energy accumulated into the lekage inductance of the trafo.
The other BYV52 diodes could be the rectifiers to allow the welding machine to work in DC mode on the output.

Mandi
 

FANT said:
In any case, the first picture seems to be a recovery diode, the diode that dissipates the energy accumulated into the lekage inductance of the trafo.

Mandi
Click to expand...

Thank you very much. I have not schematic. I understand about the BYV52, but not about the above diode (SITTA 1206 DI). There are not trafo.
 

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