Power device and magnetic device thereof

A magnetic device, comprising:

• at least one magnetic core assembly comprising:
• a first magnetic cover and a second magnetic cover;
• and
• a first magnetic leg, a second magnetic leg and a third magnetic leg, wherein the first magnetic leg, the second magnetic leg and the third magnetic leg are arranged in sequence along a same direction, the first magnetic leg, the second magnetic leg and the third magnetic are disposed between the first magnetic cover and the second magnetic cover, and the second magnetic leg is disposed between the first magnetic leg and the third magnetic leg, wherein a magnetic resistance of each of the first magnetic leg and the third magnetic leg is greater than a magnetic resistance of the second magnetic leg;
• a first secondary winding and a second secondary winding, wherein the first secondary winding is disposed between the first magnetic leg and the second magnetic leg, and the second secondary winding is disposed between the second magnetic leg and the third magnetic leg;
• and
• a primary winding, wherein a first terminal of the primary winding is disposed between the first magnetic leg and the second magnetic leg so that the primary winding is wound around the second magnetic leg, and a second terminal of the primary winding is disposed between the second magnetic leg and the third magnetic leg.