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Why is it that high frequency transformers can be smaller than their low frequency counterparts?
I understand that switching power supplies (such as those used in computer power supplies) can use small, light transformers because they convert AC to DC and then convert the DC to high frequency current before stepping the voltage down through a transformer. For a given wattage power supply, a switching power supply is much smaller and lighter than than a non-swithching supply because it can use such a small transformer. Why does a high frequency allow a smaller transformer to be used?
It seems to me that for a given wattage supply, whether switching or not, the same amount of power passes through the transformer. Since only the frequency of the input voltage is changed, but not the voltage itself, the currents in the transformer's windings should also be the same for either supply type.
What is it about high frequency that allows a smaller transformer to be used?
Thanks!
higher frequencies( hertz) make motors and loads conusume less amps this meansa smaller transformer can provide the eame KVA if it is producing a high HZ
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