Patent ID: 6078240
Filing Date: 2000-06-20
Classification: H01F

Abstract:
A transformer comprising:a) a bobbin with a plurality of winding slots with windings located therein, the bobbin having a middle mounting hole open at opposite ends, flat plates extending from opposite ends of the bobbin adjacent to the openings of the middle mounting hole, and a plurality of pins extending from each flat plate;b) an isolating cover formed of an electrically insulating material and having: a housing portion comprising a plurality of sidewall portions and a top wall portion joined with the sidewall portions to bound an internal chamber having an open bottom, opposite sidewall portions each having an opening therethrough; a lateral flange extending laterally outwardly from the housing portion; and a plurality of L-shaped walls extending upwardly from the lateral flange, the L-shaped walls each having two legs, one of the legs of each of the L-shaped walls aligned with a side of one of the openings through the opposite sidewalls of the housing portion and the other of the two legs being spaced from the housing portion, the isolating cover mounted on the bobbin such that at least a portion of the lateral flange rests on the flat plates whereby the plurality of winding slots are located in the internal chamber so as to be covered by the top wall portion and sidewall portions, and the openings through the opposite sidewall portions are aligned with the middle mounting hole of the bobbin, the lateral flange extending over at least a portion of the plurality of pins;c) an I core located in the middle mounting hole; and,d) a frame core located on at least a portion of the lateral flange, the frame core having central frame core opening into which the housing portion extends such that the top wall portion is flush with a top surface of the frame core.