Why or how do MFDC controls change current from AC to DC to AC to DC?

How to convert ac to dc to ac to dc

 Inverter Control Transformer Schematic

Conversion In Control and Transformer of Mid Frequency Inverter

The advantage of MFDC is that the weld current has no zero cross overs so it heats the part quickly. Also, it is DC so there are no inductive power losses or problems with magnetic material in the machine throat.
Generally the plant power requirement is reduced substantially with the 3 phase input. Another advantage is robot payload. Higher frequency in the transformer allows the iron core to be smaller. This is a weight reduction which is significant on the end of a robot arm.

Reference:  ENTRON Controls LLC




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