Variable coupling dc superconducting transformer

Claim 1

A variable coupling dc transformer capable of supplying a transformed direct current into a load comprising a first conductor comprising a foil of Type I superconducting material selected from the class consisting of lead and tin and which is capable of existing in the intermediate state, said first conductor having a thickness of between 1/40 mm. and 2 1/2 mm., a second conductor comprising a film of Type I superconducting material selected from the class consisting of lead and tin and which is capable of existing in the intermediate state, said second conductor having a thickness of between 1,000 A and 10,000 A, said first and second conductors being substantially parallel and separated from each other by a film of electrical insulating material having a thickness of between 500 A and 20,000 A, means for cooling said conductors below the transition temperature of the superconducting materials, means for generating an electrical current through said first conductor, means in addition to said electrical current for generating a magnetic field perpendicular to and coupling said first and second conductors, said magnetic field establishing both said conductors in the intermediate state, means for varying the strength of said magnetic field to vary the flux coupling between said conductors, and load means connected to said second conductor for utilizing a unidirectional voltage generated within said second element by the current flow in said first conductor.