An integrated magnetic element, comprising: a magnetic-core frame, having a first side pillar and a second side pillar opposite to the first side pillar; a first C-type magnetic core, arranged on a side of the first side pillar of the magnetic-core frame, and having a side pillar adjacent to the first side pillar of the magnetic-core frame; a second C-type magnetic core, arranged on a side of the second side pillar of the magnetic-core frame, and having a side pillar adjacent to the second side pillar of the magnetic-core frame; a first coil winding (La), winding around the first side pillar of the magnetic-core frame and the side pillar of the first C-type magnetic core; and a second coil winding (Lb), winding around the second side pillar of the magnetic-core frame and the side pillar of the second C-type magnetic core; wherein the first C-type magnetic core has a gap located opposite to the side pillar of itself, and the second C-type magnetic core has a gap located opposite to the side pillar of itself; and wherein the first coil winding (La) and the second coil winding (Lb) have the same winding direction; characterized in that the first coil winding (La) connects to one of P and N input terminals, and winds around the first side pillar of the magnetic-core frame and the first side pillar of the first C-type magnetic core through a first window and a second window, respectively, and the second coil winding (Lb) connects to the other of the P and N input terminals, and winds around the second side pillar of the magnetic-core frame and the first side pillar of the second C-type magnetic core through the first window and a third window, respectively. a magnetic-core frame, having a first side pillar and a second side pillar opposite to the first side pillar; a first C-type magnetic core, arranged on a side of the first side pillar of the magnetic-core frame, and having a side pillar adjacent to the first side pillar of the magnetic-core frame; a second C-type magnetic core, arranged on a side of the second side pillar of the magnetic-core frame, and having a side pillar adjacent to the second side pillar of the magnetic-core frame; a first coil winding (La), winding around the first side pillar of the magnetic-core frame and the side pillar of the first C-type magnetic core; and a second coil winding (Lb), winding around the second side pillar of the magnetic-core frame and the side pillar of the second C-type magnetic core; wherein the first C-type magnetic core has a gap located opposite to the side pillar of itself, and the second C-type magnetic core has a gap located opposite to the side pillar of itself; and wherein the first coil winding (La) and the second coil winding (Lb) have the same winding direction; characterized in that the first coil winding (La) connects to one of P and N input terminals, and winds around the first side pillar of the magnetic-core frame and the first side pillar of the first C-type magnetic core through a first window and a second window, respectively, and the second coil winding (Lb) connects to the other of the P and N input terminals, and winds around the second side pillar of the magnetic-core frame and the first side pillar of the second C-type magnetic core through the first window and a third window, respectively.