Direct current transformer

• US 4,135,127 A
• Filed: 03/29/1977
• Issued: 01/16/1979
• Est. Priority Date: 03/29/1977
• Status: Expired due to Term

• Current Assignee: Eugene W. Urban, Fletcher James C Administrator of The National Aeronautics and Space Administration With Respect To An Invention of, Shyam M. Khanna
• Original Assignee: Eugene W. Urban, Fletcher James C Administrator of The National Aeronautics and Space Administration With Respect To An Invention of, Shyam M. Khanna
• Inventors: Khanna, Shyam M., Fletcher, James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of, Urban, Eugene W.
• Primary Examiner(s): Pellinen, A. D.
• Application Number:
  US05/782,462
• Time in Patent Office: 658 Days
• Field of Search: 323/44 F, 336/DIG. 1
• US Class Current: 323/360
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 36/00 Transformers with superconductive windings or with windings operating at cryogenic temperature superconducting magnets or superconducting coils H01F6/00
• CPC Class Codes: H01F 38/40 for dc
• CPC Class Codes: Y02E 40/60 Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
• CPC Class Codes: Y10S 336/01 Superconductive
• CPC Class Codes: Y10S 505/87 including transformer or inductor

Abstract

A direct current transformer in which the primary consists of an elongated strip of superconductive material, across the ends of which is applied a direct current potential. Parallel and closely spaced to the primary is positioned a transformer secondary consisting of a thin strip of magnetoresistive material.

Claims

1. A direct current transformer comprising:

a primary electrical conductor having a pair of opposite ends comprising transformer input terminals;

a source of D.C. signal, I_P, connected across said terminals, whereby a direct magnetic field is provided;

the material of said primary electrical conductor and level of said D.C. signal I_P being such that said primary electrical conductor is superconductive in the presence of said signal I_P, and that said signal I_P rises at least to the critical level for said superconductive material, whereby moving vortices are created in said primary electrical conductor;

a secondary electrical conductor of a magneto-resistive material, said secondary conductor being positioned closely adjacent to, but electrically insulated from, said first conductor, and having a pair of unbiased end terminals; and

environmental means for applying a low temperature to said primary and secondary electrical conductors, said temperature being no higher than the superconducting transition of said primary electrical conductor;

whereby D.C. potential V_S appears across said terminals of said secondary conductor responsive to the application of said signal I_P across said terminals of said primary electrical conductor.

2. A direct current transformer as set forth in claim 1 further comprising bias means for applying a second magnetic field to said primary and secondary conductors, whereby together the applied magnetic fields produce a magnetic field which penetrates said primary and secondary conductors, and said magnetic fields do not exceed a value which would render said primary non-superconductive.