Transformer with adjustable turns ratio

Claim 2

A transformer circuit comprising: a two-winding principle transformer having an actual primary winding-to-secondary winding turns ratio of N:1; and at least one three-winding vernier transformer whose first, second, and third windings are in the ratio of 1:1:A; one end of said first winding being connected to one end of the primary winding of said principle transformer; one end of said second winding being connected to the other end of said primary winding; said first and second windings being further arranged so that the magnetic fields produced thereby by a common current flowing through said first, second and primary windings add constructively; and means for connecting the third winding of said vernier transformer across the secondary winding of said principle transformer; said transformer circuit having an effective turns ratio Neff:1 between the other ends of said first and second windings and said secondary winding of (N + OR - 2/A):1.

Claim 3

The arrangement according to claim 1 wherein said transformer circuit is an in-phase hybrid coupler having two pairs of conjugated ports in which: one end of said secondary winding is a common junction; the other end of said secondary winding and a center-tap along said primary winding, taken with respect to said common junction, constitute one pair of conjugate ports; and in which the other ends of said first and second winding, taken with respect to said common junction, constitute a second pair of conjugate ports.

Claim 4

The arrangement according to claim 1 including at least one additional vernier transformer having a net first winding-to-second winding turns ratio of 1:B; wherein said third winding of said three-winding vernier transformer and said first winding of said one additional vernier transformer are connected in series across the secondary winding of said principle transformer; and including means for connecting the second winding of said additional vernier transformer across said secondary winding.

Claim 5

A transformer circuit comprising: a two-winding principle transformer having a primary-to-secondary winding turns ratio of N:1; a plurality of (n+1) vernier transformers including one three-winding transformer whose first, second and third windings aRe in the ratio of 1:1:A, and n two-winding vernier transformers whose first and second windings are in the ratios of 1:B, 1:C . . . 1:Z, respectively; the first and second windings of said three-winding vernier transformer being connected in series with the opposite ends, respectively, of the primary winding of said principle transformer such that the magnetic fields produced by a common current flowing through said first and second series-connected windings add constructively; the third winding of said three-winding transformer and the second winding of each of n-1 of said n two-winding vernier transformers being connected in series with a first winding of a different two-winding vernier transformer to form a total of n series-connected vernier windings; each of said n series-connected vernier windings, and the second winding of said nth two-winding vernier transformer being connected across the secondary winding of said principle transformer.

Claim 6

A transformer circuit comprising: a two-winding principle transformer having a primary-to-secondary winding turns ratio of N:1; a plurality of (n+1) vernier transformers including one three-winding transformer whose first, second and third windings aRe in the ratio of 1:1:A, and n two-winding vernier transformers whose first and second windings are in the ratios of 1:B, 1:C . . . 1:Z, respectively; the first and second windings of said three-winding vernier transformer being connected in series with the opposite ends, respectively, of the primary winding of said principle transformer such that the magnetic fields produced by a common current flowing through said first and second series-connected windings add constructively; the third winding of said three-winding transformer and the second winding of each of n-1 of said n two-winding vernier transformers being connected in series with a first winding of a different two-winding vernier transformer to form a total of n series-connected vernier windings; each of said n series-connected vernier windings, and the second winding of said nth two-winding vernier transformer being connected across the secondary winding of said principle transformer.