Fractional turns transformers save space, cut costs and improve the efficiency of AC/DC power supplies

Fractional turn transformers are not a new idea but it's not a concept that appears to have been applied to AC/DC power supplies in the past. For multiple output power supplies in particular it offers some significant advantages in terms of saving space, cutting cost and improving efficiency.
The challenge comes when you need multiple outputs. In a power supply where 5V and 12V outputs are needed, it would be ideal to have the 5V winding as a single turn on the transformer, but the 12V winding then becomes 2.5 turns, which can't be manufactured.
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