초록 ▼

A shielded transformer of the type particularly used as an isolation transformer, has a greatly reduced interwinding capacitance. Metallic overlap is provided, completely across a juncture of the metallic shield with faces of the windows in the core, and completely across a juncture of the metallic

A shielded transformer of the type particularly used as an isolation transformer, has a greatly reduced interwinding capacitance. Metallic overlap is provided, completely across a juncture of the metallic shield with faces of the windows in the core, and completely across a juncture of the metallic shield with the metallic case. This metallic overlap is tolerant to misalignments and variations in fit, completely eliminating gaps that cannot be economically made small with the butt joint of present art. The overlap comprises grooves in faces of the window or in the case. In a second embodiment, the overlap comprises grooves in channels on faces of the window and on the case. The shield fits into the grooves.

대표청구항 ▼

A shielded transformer comprising: (a) a core with at least one window, said core being composed of multiple ferromagnetic laminations; (b) a primary winding encircling a portion of said core and passing through one window in said core; (c) a secondary winding encircling a portion of said core and p

A shielded transformer comprising: (a) a core with at least one window, said core being composed of multiple ferromagnetic laminations; (b) a primary winding encircling a portion of said core and passing through one window in said core; (c) a secondary winding encircling a portion of said core and passing through said core; (d) a metallic case enclosing said primary and secondary windings, said case including outer faces of said core and surrounding said primary and secondary windings where the windings extend outside said window in said core; (e) a metallic shield between said primary and secondary windings, said shield being in said window in said core, said shield having a juncture with edges of the faces of said window and intercepting any possible electrostatic field line between any point on said primary winding and any point on said secondary winding; and (f) a metallic overlap extending completely along the length of the juncture of said metallic shield and faces in said core for intercepting electrostatic field lines having a tendency to pass through said juncture, said metallic overlap including conducting wall means on the faces of said window, said wall means having faces against which a face of the shield abuts.