US Patent 9922763 Transformer with two transformation ratio

A transformer includes a first winding conductor and a second winding conductor, magnetically coupled to the first winding conductor. A first transformation ratio is achieved between the second winding conductor and the first winding conductor. A first distance between the first winding conductor and the second winding conductor is higher than a distance threshold, and accordingly, a first coupling factor between the first winding conductor and the second winding conductor is lower than a coupling factor threshold.