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I want to wind a 12-0-12V, 20A transformer for an inverter. My question is how to calculate the power of the transformer. Is it 12*20 = 240W or 24*20 = 480W (Because 12-0-12 if 24 volts full wave). Please help me
In the push-pull transistors that drive the transformer, only one transistor conducts 12V/20A at a time. So the output power is 12V x 20A= 240W if the transistors are low on-resistance Mosfets and the transformer has no resistance. Your inverter will have a square-wave output voltage that is the proper voltage when it has no load. But its output voltage will be too low when it has a load due to the resistance of the transistors and the transformer.
Many electronic products do not work from a square-wave because they depend on the higher peak voltage of a sine-wave.
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