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dudeshan said:Is there any difference between AC and sinusoidal waveform ?
Sine wave is AC, AC means only sine or what ???
Is quassi square waveform AC ?
UPS/inverter genrally give Quassi-square waveform o/p .
To get Sine, we use Ott Filter.
But, can quassi square wave be called as AC.
basically anything which will pass through a... transformer is AC.
John, could you clarify that? I'm assuming you mean that a fluctuating DC (equal to AC with a DC offset) will pass through a transformer.DC will pass through a transformer.
John Sorensen said:basically anything which will pass through a... transformer is AC.
Just for clarity, DC will pass through a transformer. And pulsed DC will even pass across a transformer. The direction of current flow needn't change.
I know what you meant, Nigel, it just struck me as odd :wink: .
j.
Ron H said:John, could you clarify that? I'm assuming you mean that a fluctuating DC (equal to AC with a DC offset) will pass through a transformer.DC will pass through a transformer.
John Sorensen said:Just for clarity, DC will pass through a transformer. And pulsed DC will even pass across a transformer. The direction of current flow needn't change.
I thought about that, but it isn't necessarily true. Consider an air core transormer.Styx said:Ron H said:John, could you clarify that? I'm assuming you mean that a fluctuating DC (equal to AC with a DC offset) will pass through a transformer.DC will pass through a transformer.
Even if that was the case, then yes the AC content of the DC waveform (ie the ripple) would get through, however the DC content would still saturate the XFMR
Pulsed DC is still AC
John Sorensen said:Pulsed DC is still AC
Definition of alternating current:
An electric current that periodically reverses its direction.
Pulsed DC does not reverse its direction of flow (the electrons are always going the same way. The don't flow one way, then the other. They flow: then they don't: then they flow: then they don't).
j.
Styx said:that is a load of crap.
XFMR's are AC devices. DCC converters or SMPS that incorperate XFMR isolation just PWM DC onto the XFMR thus teh XFMR sees and AC signal .
YOU CANNOT PASS A DC LEVEL THROUGH A XFMR>
If that was the case my IGBT's gate drivers would be soo much simpler!!!!
Juglenaut said:Pulsed DC does not flow to and from the supply as the current flows in one direction, only true AC flows to and from.
Nigel Goodwin said:Juglenaut said:Pulsed DC does not flow to and from the supply as the current flows in one direction, only true AC flows to and from.
But this is a 'distinction, without a difference' - if you pass the 'pulsed DC' through a capacitor it removes the DC offset and produces a signal which swings positive and negative about zero volts.
I can't think of any application where pulsed DC has any disavantages over AC, can you?.
Styx said:Nigel Goodwin said:I can't think of any application where pulsed DC has any disavantages over AC, can you?.
well I can think of only 1 when the harmonic content is of concern (but this would only be for power and you would want to use a pure sinewave to ensure hte XFMR is at its most efficient)