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ok_zeeshan asked dear all i need to know if we have voltage and current in DC and voltage in AC,how to calculate current in AC?
also whether AC power and DC power are equal or not. like i have -48v dcsupply for telecom equipment from rectifier and my equipment draw 122 amp load dc. now i need to know how i covert this 122 dc current in AC with 230V ac supply to rectifier? any formula will gives help me alot.
And got the following answer:
The power on the AC side will be the same as on the DC side plus losses. For the diodes, estimate the diode drop at 1.2V x 2 diodes and divide by the DC voltage. That gives you 2.4/48 = 0.05 or 5%. A 6 KVA transformer probably has no more than 2% losses. The filter might have 2 or 3% losses, so say 10% total. The fundamental component of the current at 230V would then be 1.1 X 122 X 48/230 = 28 amps. There won't be any significant reactive current, but there may be a lot of harmonic current. For most purposes, harmonic current has the same effect as reactive current. It is current that flows in the circuit but delivers no power. It could add 50% to the current on the AC side. You might see more than 40 amps at 230 volts. If the 230V supply has a lot of impedance or if the power supply has an inductor on either the AC or the DC side, the harmonic content and the total RMS current will be reduced.