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1kW 200/400V dc/dc converter design tip
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webgiorgio:
Hello,
I would like to make a DC/DC converter to use it in my Photovoltaic plant, where I need to boost 200 Vdc 5A to 400 Vdc 2.5A, so that I can parallel a string of 6 PV panels with other strings of 12 panels. 1200W.
Vmpp for one panel is 33.3V (200V/6).

Is a simple boost converter with 50% fixed duty cycle enough? (inductor, N-mos to ground, diode)
Can you recommend any more energy efficient topology for this voltage and power level?
Shall I implement a check of Vi and Vo? (actually, Vo is imposed by the strings with 12 panels and the inverter).

I only need to make one, so I am not too concerned about the cost of it, it would be nice to make it efficient.
Miyuki:
It is not a big deal, as you have low current

You can use SiC Diode and transistor if you want high efficiency / high frequency 
Not a big deal

Just simple boost converter
Benta:
At 1 kW I'd choose a full-bridge converter with transformer coupling. The inductors in boost (this includes flyback) converters of that size tend to be unmanageable large, as they have to store the full energy.

A forward converter could also be an option.

TrickyNekro:

--- Quote from: Benta on January 25, 2019, 04:37:05 pm ---A forward converter could also be an option.

--- End quote ---

Yup, I like that thought also, you could do it also center-taped style, push-pull. Which is pretty much a variation of the forward converter.
coppercone2:
Someone should write a treatise on their experiance with magnetic elements in such smpsu of their own design. Its always been the x factor that makes me not want to venture into this area. I heard bad things about big magnetics even from seasoned university professors.
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