Amplifiers – With saturable reactor-type amplifying device
Patent
1985-12-30
1987-06-23
Mullins, James B.
Amplifiers
With saturable reactor-type amplifying device
33DIG13, 73DIG2, 7386264, 324253, 336 20, 336110, 336184, 336215, H03F 900, G01L 114, G01R 3304
Patent
active
046756159
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.
REFERENCES:
patent: 4339792 (1982-07-01), Yasumura et al.
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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