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Design guidance needed for 3 phase SMPS

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satiz

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Hello,

I have a single phase SMPS design which will work from 180V 50hz to 275V 50Hz, I need to convert that into three phase SMPS. Please give me some guidance to do this.Thanks in advance.
 

Converting to three phase for 230/400V supply means to increase the nominal DC bus voltage from 325 to 560 V (+ overvoltage margin) for a simple (non-PFC) SMPS.
 

Yes, I am planning to place one mosfet regulator or triac to change 560V DC into some 300V DC will it work ?
 

If PF is not an issue why don't you try half wave rectifier ? so that you will have same voltage as single phase in the i/p side.
 

ok, but It won't work for single phase right ? I need a SMPS circuit which has to work single phase as well as three phase
 

you could just have three of them, and have each one connected to a single phase of the three phase. As you now, three phase is just three single phases phased with respect to each other.
If when 3 ph is connected, you want three of them to all 'pour' into the same output, then you need isolation, and could do the trick where one is a (master) voltage regulator for vout..and the other two just "copy" the master's current, as current regulators.
 

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