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Title: US4675615: Magnetic amplifier
[ Derwent Title ]

Country: US United States of America

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8 pages

Inventor: Bramanti, Donato; Via Vecchia Fiesolana 40, Italy

Assignee: None

Published / Filed: 1987-06-23 / 1985-12-30

Application Number: US1985000814263

IPC Code: Advanced: G01R 33/04; H03F 9/00;
IPC-7: G01L 1/14; G01R 33/04; H03F 9/00;

ECLA Code: G01R33/04; H03F9/00;

U.S. Class: Current: 330/008; 033/DIG.013; 073/862.69; 073/DIG.002; 324/253; 336/020; 336/110; 336/184; 336/215;
Original: 330/008; 033/DIG.13; 073/DIG.2; 073/862.64; 324/253; 336/020; 336/110; 336/184; 336/215;

Field of Search: 330/008,60,63 324/244,253 336/020,110,170,184,215 033/DIG. 13 073/862.64,862.68,DIG. 2

Priority Number:
1985-12-30  US1985000814263

Abstract:     A magnetic amplifier employing a single four-legged ferrite core having orthogonally disposed through holes in the core. Biasing is provided of the magnetic core so as to provide operation in the non-linear parts of the core's hysteresis cycle. A first coil on the ferromagnetic core has an AC excitation signal applied thereto and a second coil on the core is wound orthogonally to the first coil and is adapted to have an output signal derived therefrom. A control or input current in a third coil is used to unbalance the magnetic bridge formed by the four legs, so as to produce a mutual inductance different from zero between the first and second coil. The biasing may be provided by a fourth coil or by permanent magnet means.

Attorney, Agent or Firm: Wolf, Greenfield & Sacks ;

Primary / Asst. Examiners: Mullins, James B.;

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First Claim:
Show all 18 claims
What is claimed is:     1. Magnetic apparatus comprising;
  • a ferromagnetic core having multiple core legs defined at least in part by orthogonally disposed through holes in the core,
  • means for biasing the ferromagnetic core to the non-linear operating segments of the hysteresis cycle,
  • first coil means on the ferromagnetic core,
  • means for applying an AC excitation signal to said first coil means,
  • second coil means on the ferromagnetic core and wound orthogonally to said first coil means,
  • means deriving an output signal from said second coil means,
  • third coil means on the ferromagnetic core and means for applying a control signal to said third coil means,
  • said ferromagnetic core has four legs defined by a pair of orthogonally disposed holes including first and second holes,
  • said first coil means would on the core through said first hole in a first direction,
  • said second coil means wound on the core through said second hole in a second direction generally orthogonal to said first direction,
  • said third coil means wound on the core through both said first and second holes.

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Forward References: Show 10 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (10)   |   Backward references (1)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 16pp US4339792  1982-07 Yasumura et al.   Voltage regulator using saturable transformer
Foreign References: None

Other References:
  • Brueckner et al., "Cross Field Three-Phase Magnetic Amplifier," IBM Technical Disclosure Bulletin, vol. 21, No. 10 Mar. 1979, p. 3954.
  • Van Der Heide, "A Magnetic Amplifier For The Visual Presentation of Low-Frequency Hysteresis Loops of Very Small Ferromagnetic Samples", IEEE Transactions On Magnetics, vol. 1, Jun. 1965 pp. 87-90.

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