Wind mill controller reverse engineering

[somlioy]

Hello

I got a wind mill controller that was fried somehow and the model is out of production so I thought it'd be a great exercise to create a new one. I've traced out the power circuits but I'm not quite sure whats going on. I'd be greatful if someone can explain. What I dont get is how the negative is created.

The stator has three phases. Wind mill output is supposed to be 12V.

The gate of the mosfets are going to a microcontroller or something, 32 pin TQFP-package I believe. The top is scraped off, but there's a 3.579545 Mhz crystal nearby going to pin 3/4.

Anyway, see attached image for schematic.

[NiHaoMike]

It's actually a boost converter that doesn't look like one at first glance.
http://techno-fandom.org/~hobbit/cars/boost-hack/

[somlioy]

That's quite clever. Is it possible to regulate the "dc bus" to a constant charging voltage with these components and how does the mcu know when to fire the mosfets?