SMPS in series function

[Vindhyachal.takniki]

1. I need to make 200Vdc/5Adc SMPS from 220Vac/50Hz.
2. Its very high dc voltage. But I have 50Vdc/5A SMPS which has internal current limiting i.e if load ever tries to draw more than 5A from it, SMPS will go to CC mode.
3. can I connect 4 smps in series to make 200vdc/5A?
4. Can it work? What could be pitfalls? havent tried it myself as I dont know if something can went wrong?

[oldway]

First of all, it is, as you say, a high tension with high risks.
Should the 200Vdc voltage have to be adjustable? If yes, how much?
What is the ripple allowed to 5A?
What is the requested regulation?
What is the grounding scheme? Should the 200Vdc be grounded? If yes, the + or -?

To answer your question,
"Can I connect 4 smps in series to make 200vdc / 5A?"
No, because the last power supply will have a potential of 150V with respect to earth, this is not acceptable with respect to the case that must be earthed, or with respect to the insulation of the ferrite transformer.

[Vindhyachal.takniki]

found this, on page5, it explains.
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwja0fbWuPnUAhVIKpQKHVO_AfYQFghCMAQ&url=http://www.nextys.com/files/sito/application_notes/AN004_Parallel_and_Series_Connection_of_Power_Supplies_V1-0.pdf&usg=AFQjCNFvBIW2cYzsVKNrubM_SFPHYDjIFg

[b_force]

In depends on the topology they are using.
If they are floating (insulated), I think it's possible.
For example, you can use Meanwell power supplies in series and symmetric mode (a plus and minus voltage).
Meanwell is also pretty affordable, so I would just write them an e-mail with this question.

[Avacee]

I'm ignorant of putting supplies in series but wouldn't the first SMPS in the series have to provide 20A at 50V to equal the 1000W wanted overall? - which is above the 5A current limit.
Then the second at 100V provides 10A.. the third 6.66A.. the fourth 5A at 200V.
And that's assuming 100% efficiency...

[b_force]

I'm ignorant of putting supplies in series but wouldn't the first SMPS in the series have to provide 20A at 50V to equal the 1000W wanted overall? - which is above the 5A current limit.
Then the second at 100V provides 10A.. the third 6.66A.. the fourth 5A at 200V.
And that's assuming 100% efficiency...

No, They just need to be the same current (power) rating.
Of course you can use a power supply with an higher rating if you need other voltages as well.