A transformer according to the present invention comprises: a primary side wiring including a first wiring connected to a first end, and a second wiring connected to a second end; a secondary side wiring including a third wiring connected to a third end, and a fourth wiring connected to a fourth end; a first connecting switch connected between the first wiring and the second end; a second connecting switch connected between the first switch and the second wiring; a third connecting switch connected between the third wiring and the fourth end; and a fourth connecting switch connected between the third switch and the fourth wiring.;COPYRIGHT KIPO 2015
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