I threw this design together today and I'm wondering if it would work in real solder and components. My primary concern is the startup supply, I designed a buck converter (I guess) that operates at almost zero crossing where it picks up at the 45V region, being I have the MOSFET seeing 10% of the full voltage and clip it at 12V, but there are some nasty spikes in the first few ms.
There was very little calculation done, it's still rough. I haven't added the short circuit protection yet, nor did I calculate the output filter, I just put 6 100u caps that I actually have. I'm also thinking of redesigning the PFC Control stage to use some logic where they kinda play catch with each other once the switch current reaches max. But I was just wondering if I'm going in the right direction.