Surface mount current transformer structure
AssigneeAT&T Bell Laboratories
InventorsJeffrey J. Boylan, Lennart D. Pitzele
Life of this patent
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Abstract
A miniature current transformer is equipped with a primary winding insert formed as a stamped metal piece with elongate legs and a flange portion disposed at 90 degrees to the legs. The top of the flange is unobstructed by other structural details, and is wide enough to be gripped by vacuum pick-and-place equipment. At the same time the insert is electrically functional as the transformer's primary winding. The flange rests on surfaces formed in the transformer bobbin. The insert legs are mounted through passages n the bobbin leading out to the bobbin's bottom side. The legs are formed into gull-wing ends that have a dual role as lock tabs to secure the insert on the bobbin, and as the primary leads.
Claims10
A power conversion transformer comprising:
- a bobbin having a base platform, first and second end walls extending from said base platform, an interior wall formed adjacent to said first end wall to form a well, and a secondary winding armature disposed between said interior wall and said second end wall;
- a secondary wire winding wrapped on said armature;
- and
- an insert element constituting the primary winding of said transformer comprising:
- two elongate legs disposed in said well and a flange bent at substantially right angles to said legs, the flange having a flat top surface exterior to said right angle to serve as a pick-up surface for vacuum pick-and-place equipment;
- and
- the underside of said flange being disposed in close proximity to a section of said secondary winding, and being supported on the top edge of said interior well.
Dependencies are inferred from the claim text.