# DC curent on a 6 phase system

Discussion in 'Automotive Electronics' started by Petros.Alexakis, Jun 8, 2016.

1. ### Petros.Alexakis Thread Starter New Member

Mar 10, 2016
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Hi all

A quick question. If the phase current on a 6 phase system is 380A rms what is the the DC current?

2. ### Kermit2 AAC Fanatic!

Feb 5, 2010
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RMS is a way of stating AC currents in equivalence with a DC current

An AC RMS current of any amperage has the same POWER as the same DC voltage at that current.

3. ### Petros.Alexakis Thread Starter New Member

Mar 10, 2016
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Maybe I stated the question in a wrong way. I have a 6 phase inverter with a phase current of 380A rms of 537A peak if you prefer. I am wondering how to calculate the current on the DC side of the inverter

4. ### tcmtech Well-Known Member

Nov 4, 2013
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And how does this relate to automotive?

5. ### Petros.Alexakis Thread Starter New Member

Mar 10, 2016
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Answering the question will help the calculation?

6. ### JoeJester AAC Fanatic!

Apr 26, 2005
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Sounds like homework to me.

7. ### Kermit2 AAC Fanatic!

Feb 5, 2010
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Knowing the percent efficiency of the inverter will tell you the output power if input power is known.
Ex: 90% efficiency with 1000 watts input power gives 900 watts output power.

8. ### JoeJester AAC Fanatic!

Apr 26, 2005
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What is the voltage and the current of the output? What is the input voltage?

Why not post the whole question as you received it?

9. ### Petros.Alexakis Thread Starter New Member

Mar 10, 2016
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Is attitude part of the forum or the answer? No mate it's not homework. The DC voltage is 48 volts and the AC voltage is 38 Volts

10. ### tcmtech Well-Known Member

Nov 4, 2013
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Only when the question comes across as vague and questionable plus possibly not in the most appropriate section of the forum.

shortbus likes this.
11. ### JoeJester AAC Fanatic!

Apr 26, 2005
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So, I understand you have six phases, each at 38v and 380 amperes.

You want to know the input DC current from a 48 volt source.

Correct?