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3 phase inverter using mosfet

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I want to design 3 phase inverter that will be connected to the grid (380vAC) using mosfet , What is the minimum rating voltage on the drain of the mosfet transistor?
 
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Hi,

I assume you want to rectify the input voltage.
What's the DC rail voltage then?

Klaus
 

the input voltage is dc(variable from 250-300v) , i will convert it to AC 3 phase then couple it to the distribution network. the network voltage is 380 v could i use any mosfet that has VD around 600 volt. The question is( Is there any impact of the grid distribution network voltage 380 VAC on the mosfet?)
 
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Well, depending on what you know about the grid,
and your ability to limit / filter any upside excursions
(like is it a small generator driven grid with occasional
load-dump spikes, surges, ...) you might define your
"380VAC" more conservatively, and this might make
a derating exercise pick 1000V rather than 600V FETs.
And like that. What you think is a sound derating is
a question too. Cheapness vs regular reliability vs
abnormal conditions tolerance, etc.
 

Hi,

I assume DC rail is higher than AC star peak voltage.
You can limit voltage with a diode to DC rail.

It depends on circuit if you need to calculate with single peak voltage or true peak-to-peak voltage.

Klaus
 

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