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The electronic transformer, which converts the alternating voltage of mains to DC and forms a high frequency AC voltage output electronic device by means of semiconductor switch device, electronic components and high frequency transformer windings, is also a kind of AC-ac inverter circuit described in the electronics theory.
In simple terms, it is mainly by high-frequency Transformer core (iron core) with two or more than two coils, they do not change the position, from one or more than two electrical circuits, through the alternating current power through the electromagnetic induction effect, converted into alternating voltage and currents. In the high frequency transformer output, to one or more than two electrical circuits, supply different voltage levels of high-frequency AC or DC power.