How can the wave form at point 4 be DC when the input to the transformer is AC?

How can the wave form at point 4 be DC when the input to the transformer is AC?

This question is in reference to a previous article:

THE MFDC WAVE FORM DIAGRAM IS NOT CLEAR

The answer is in the paragraph describing point 4. The primary receives an AC input. The transformer contains diodes which convert the AC input to a DC output.

 

Inverter Control Transformer Schematic

                   Conversion In Control and Transformer of Mid Frequency Inverter

 

Reference: RWMA – Resistance Welding Manual 4th Edition

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