A magnetic component comprising: a magnetic core (21, 31, 51, 71), having a first winding column (211, 311, 411, 511, 611, 711), a second winding column (212, 312, 412, 512, 612, 712), a third winding column (213, 313, 413, 513, 613, 713), at least one side column, and a first cover plate (216, 316, 617, 716) and a second cover plate (217, 317, 417, 517, 618, 717) which are disposed opposite to each other; a first winding (Npa), a second winding (Npb) and a third winding (Npc), which are primary windings; and at least one secondary winding (Ns1a, Ns2a, Ns1b, Ns2b, Ns1c, Ns2c), wherein the first winding (Npa) is wound on the first winding column (211, 311, 411, 511, 611, 711), the second winding (Npb) is wound on the second winding column (212, 312, 412, 512, 612, 712), and the third winding (Npc) is wound on the third winding column (213, 313, 413, 513, 613, 713), wherein the at least one secondary winding (Ns1a, Ns2a, Ns1b, Ns2b, Ns1c, Ns2c) is wound on each of the first winding column (211, 311, 411, 511, 611, 711), the second winding column (212, 312, 412, 512, 612, 712) and the third winding column (213, 313, 413, 513, 613, 713), wherein the second winding column (212, 312, 412, 512, 612, 712) is disposed between the first winding column (211, 311, 411, 511, 611, 711) and the third winding column (213, 313, 413, 513, 613, 713), the first cover plate (216, 316, 617, 716) and the second cover plate (217, 317, 417, 517, 618, 717) are disposed respectively above and below the first winding column (211, 311, 411, 511, 611, 711), the second winding column (212, 312, 412, 512, 612, 712), the third winding column (213, 313, 413, 513, 613, 713), and the at least one side column to form a closed magnetic flux loop; wherein the first winding (Npa), the second winding (Npb) and the third winding (Npc) are electrically coupled in series, wherein a current flowing through the first winding (Npa) and a current flowing through the third winding (Npc) have a first current direction, and a current flowing through the second winding (Npb) has a second current direction opposite to the first current direction, wherein currents flowing through the first winding (Npa), the second winding (Npb) and the third winding (Npc) have the same phase, and wherein a magnetic flux (Φa) of the first winding column (211, 311, 411, 511, 611, 711) and a magnetic flux (Φc) of the third winding column (213, 313, 413, 513, 613, 713) have a first direction, and a magnetic flux (Φb) of the second winding column (212, 312, 412, 512, 612, 712) has a second direction opposite to the first direction. a magnetic core (21, 31, 51, 71), having a first winding column (211, 311, 411, 511, 611, 711), a second winding column (212, 312, 412, 512, 612, 712), a third winding column (213, 313, 413, 513, 613, 713), at least one side column, and a first cover plate (216, 316, 617, 716) and a second cover plate (217, 317, 417, 517, 618, 717) which are disposed opposite to each other; a first winding (Npa), a second winding (Npb) and a third winding (Npc), which are primary windings; and at least one secondary winding (Ns1a, Ns2a, Ns1b, Ns2b, Ns1c, Ns2c), wherein the first winding (Npa) is wound on the first winding column (211, 311, 411, 511, 611, 711), the second winding (Npb) is wound on the second winding column (212, 312, 412, 512, 612, 712), and the third winding (Npc) is wound on the third winding column (213, 313, 413, 513, 613, 713), wherein the at least one secondary winding (Ns1a, Ns2a, Ns1b, Ns2b, Ns1c, Ns2c) is wound on each of the first winding column (211, 311, 411, 511, 611, 711), the second winding column (212, 312, 412, 512, 612, 712) and the third winding column (213, 313, 413, 513, 613, 713), wherein the second winding column (212, 312, 412, 512, 612, 712) is disposed between the first winding column (211, 311, 411, 511, 611, 711) and the third winding column (213, 313, 413, 513, 613, 713), the first cover plate (216, 316, 617, 716) and the second cover plate (217, 317, 417, 517, 618, 717) are disposed respectively above and below the first winding column (211, 311, 411, 511, 611, 711), the second winding column (212, 312, 412, 512, 612, 712), the third winding column (213, 313, 413, 513, 613, 713), and the at least one side column to form a closed magnetic flux loop; wherein the first winding (Npa), the second winding (Npb) and the third winding (Npc) are electrically coupled in series, wherein a current flowing through the first winding (Npa) and a current flowing through the third winding (Npc) have a first current direction, and a current flowing through the second winding (Npb) has a second current direction opposite to the first current direction, wherein currents flowing through the first winding (Npa), the second winding (Npb) and the third winding (Npc) have the same phase, and wherein a magnetic flux (Φa) of the first winding column (211, 311, 411, 511, 611, 711) and a magnetic flux (Φc) of the third winding column (213, 313, 413, 513, 613, 713) have a first direction, and a magnetic flux (Φb) of the second winding column (212, 312, 412, 512, 612, 712) has a second direction opposite to the first direction.