If I was designing a square wave inverter like the one using the crystal oscillator mentioned earlier, I would remove all the 50Hz generating circuit and replace it with a PIC10F202. This will result in higher loses in the transformer core and hence more power will have to be fed in to overcome it. This will influence the voltage you get out when running it in step-up mode.Īlso consider that in normal use, power transformers are fed with fairly clean sine waves but all the inverters mentioned so far use square wave switching. Step down transformer output voltage is specified under load, it will typically be 5% to 10% above the rated voltage if not loaded. Bear in mind that the extra current will cause more loss through the wire resistance.Ģ. There are losses in the power transfer of the transformer so you may have to feed more current into the low voltage side than you think. You may not get exactly the voltage you expect though for these reasons:ġ. The ratio stays the same of course because that is determined by the number of turns on each winding. A step-down transformer works as a step-up transformer by swapping the primary and secondary windings.
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