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Digital very high power adjust current supply based on a several unit

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Pavel1986STula

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Hi all!

I have to design a Power-Supply which:
Iout=0..800 A (step 0.2 A – and current feedback///current set-output)
Rload=0.0002667 Om (nearly short circuit)

And I have 9 Power supply (with voltage output, resonant type – each 12V and 100A). What is the easy solution (circuit) for adjust output current? I try the standart buck converter (see enclosure). It’s work on IRF2907ZS.

Please, ask about design output chokes. How calculate their inductance?

This link:
Switching Converter Power Supply Calculator - work bad (it’s show negative inductance).

The standard method’s (for example, Practical Design of a buck converter by Dennis L Feucht) also don’t help me in this question. May be it’s need use special program for modeling?

May be, it is more necessary connect all 9 unit in parallel and use power IGBT (2 device, for example SKM500GA128D)?

Also, tell, please any link or article for Digital feedback in such power PWM supply ( I use 24 bit ADC and 14 bit digital PWM).
And how to achieve high set-current resolution?


Thanks!


View attachment design_.bmp
:?:
 

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