Patent ID: 7710230
Filing Date: 2010-05-04
Classification: H01F,H05B,Y02B

Abstract:
1. A transformer, comprising: an insulating housing having a first chamber, and a second chamber separated from the first chamber, wherein each chamber has an aperture, with the apertures being respectively disposed on two opposite side-walls of the insulating housing the insulating housing further comprising a third chamber disposed next to the second chamber; a first bobbin having a first through hole and being disposed in the first chamber; a primary coil disposed on and surrounding the first bobbin, with the first bobbin being surrounded only by the primary coil; a second bobbin having a second through hole and being disposed in the second chamber; a secondary coil disposed on and surrounding the second bobbin; a first core inserted into the first through hole and the second through hole; a second core coupled to the first core, the first core and the second core forming a magnetic loop; another secondary coil disposed on and surrounding the second bobbin and separated from the secondary coil by a predetermined distance; a first external magnetic element disposed next to the first bobbin; a second external magnetic element disposed next to the second bobbin; an elastic element disposed on the insulating housing for pressing one end of the second external magnetic element; and an adjusting element disposed on the insulating housing, and positioned on the other end of the second external magnetic element; wherein the elastic element and the adjusting element are used for adjusting the relative position of the second external magnetic element with respect to the secondary coil and the another secondary coil; and wherein the primary coil and the secondary coil are wound around the first and the second bobbins respectively and are disposed in the first and the second chambers respectively, so that the primary coil and the secondary coil are separated by the insulating housing.