Electrical transformers

Claim 2

An electrical transformer, comprising a magnetic core providing a closed magnetic circuit extending around and defining an aperture, first and second electrical conductors each providing relatively large electrically conductive area, means mounting the first and second conductors on the core so that they extend across the aperture therein with the core between them, a plurality of primary windings wound on the core all in a single-layer and extending through the said aperture with the ends of each winding being respectively electrically connected to the first and second conductors so that the windings are electrically connected in parallel thereby, third and fourth conductors each providing relatively large electrically conductive area, means respectively mounting the third and fourth conductors adjacent to but electrically insulated from the first and second conductors, and a plurality of secondary windings wound on the core all in a single-layer and extending through the aperture thereof with the ends of each secondary winding being respectively electrically connected to the third and fourth conductors so that the secondary windings are electrically connected in parallel thereby.

Claim 3

A transformer according to claim 1, in which each of the first and second conductors defines a through hole, in which the third and fourth conductors are respectively mounted outside of the first and second conductors, and in which the ends of the secondary windings extend with electrically insulating clearance through the holes in the first and second conductors to the third and fourth conductors.

Claim 4

A transformer according to claim 1, in which each of the primary and secondary windings comprises a plurality of turns and the turns of the primary windings are arranged in bi-filar form.

Claim 5

A transformer according to claim 1, including an electrically conductive band at least partially encircling the outer periphery of the core, and in which each primary winding comprises a first turn connected at one end to the first conductor and wound round the core and terminating at an electrical connection on the said band, and a second turn electrically connected to the said band and wound round the core and terminating at an electrical connection on the second conductor.

Claim 6

A transformer according to claim 1, in which the core is a toroidal core.

Claim 7

A high frequency, wideband electrical transformer, comprising a toroidal core, first and second planar, apertured electrical conductors mounted on opposite sides of the core with their apertures coaxial with the core, an electrically conductive band encircling the outer periphery of the core, a plurality of primary windings wound on the core all in single-layer form, each primary winding having two bi-filar turns one of which is electrically connected at one end to the first conductor and winds round the core and is electrically connected at the other end to the said band, and the other of which is electrically connected at one end to the said band and winds round the core and is electrically connected at the other end to the second conductor, such that the said band provides a center-tap terminal for the transformer, third and fourth planar electrical conductors respectively arranged outside of and adjacent to but electrically insulated from the first and second conductors, and a plurality of secondary windings wound on the core and in single-layer form and each winding comprising a plurality of turns round the core with one end of each winding extending with electrically insulating clearance through the aperture in the first conductor to an electrical connection on the third conductor and the other end of each winding extending with electrically insulating clearance through the aperture in the second conductor to an electrical connection on the fourth conductor.

Claim 8

A high frequency, wideband electrical transformer, comprising a toroidal core, first and second planar, apertured electrical conductors mounted on opposite sides of the core with their apertures coaxial with the core, an electrically conductive band encircling the outer periphery of the core, a plurality of primary windings wound on the core all in single-layer form, each primary winding having two bi-filar turns one of which is electrically connected at one end to the first conductor and winds round the core and is electrically connected at the other end to the said band, and the other of which is electrically connected at one end to the said band and winds round the core and is electrically connected at the other end to the second conductor, such that the said band provides a center-tap terminal for the transformer, third and fourth planar electrical conductors respectively arranged outside of and adjacent to but electrically insulated from the first and second conductors, and a plurality of secondary windings wound on the core and in single-layer form and each winding comprising a plurality of turns round the core with one end of each winding extending with electrically insulating clearance through the aperture in the first conductor to an electrical connection on the third conductor and the other end of each winding extending with electrically insulating clearance through the aperture in the second conductor to an electrical connection on the fourth conductor.

Claim 9

A transformer according to claim 6, in which each turn of the secondary winding is made of p.t.f.e. insulated wire.

Claim 10

A transformer according to claim 6, including respective terminal means on each of the first, second, third and fourth conductors and on the said conductive band, for makIng external connections to the transformer.