I've been experimenting on a lot of half-bridge-based PC PSU schematics. There's one thing I cannot understand:
As can be seen from above, there's an extra winding in series with the high side driving winding (marked with red ?) and one end of it goes directly to the primary of power transformer.
What is its purpose?
Thanks.
Answer
Can you tell if the winding is actually magnetically coupled to the other windings? If not it is likely a shim inductance in order to facilitate resonant soft switching. Which controller is this design using? (Would have left this as a comment, but for some reason the comment link isn't working.)
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