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jinxnao
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UPS input Cos fi

12/14/2010 10:35 AM

Hello, As you know a UPS which has a PFC unit with IGBT has quasi 1.0 power factor. I wonder what would be input cosfi of it, if it was a 12 pulse rectifier diode input and the load was a pure resistance.?

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Anonymous Poster
#1

Re: UPS input Cos fi

12/14/2010 10:24 PM

There is nothing called input power factor in electrical engineering.
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Tornado
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#2

Re: UPS input Cos fi

12/14/2010 11:12 PM

Since the load is resistive, φ (Greek letter phi, not fi) = 0; hence cos φ = 1.

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jinxnao
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#3

Re: UPS input Cos fi

12/15/2010 7:22 AM

it is funny that you say "there is no input power factor in electrical engineering" really. As you know there is a PFC circuit in modern UPS's so the p.f of your is different that the input p.f of your UPS.I hope you got it dear guest...

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Anonymous Poster
#4
In reply to #3

Re: UPS input Cos fi

12/15/2010 8:02 AM

I said input. Till the incomer of your UPS. I know you have "input load, input resistance, input efficiency etc
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