Amplifiers Using Nonlinear Reactors (i.e., Magnetic Amplifiers) Patents (Class 307/416)
  • Patent number: 9583255
    Abstract: A surge blocking inductor. In one embodiment, the surge blocking inductor includes a core; a first winding wound about the core in a first direction; and a second winding wound about the core in a second direction, wherein the first winding and the second winding are magnetically independent when the core is in a non-saturated state, and wherein the first winding and the second winding are coupled magnetically when the core is in a saturated state.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: February 28, 2017
    Assignee: Enphase Energy, Inc.
    Inventors: Martin Fornage, Arash Nejadpak
  • Patent number: 8610311
    Abstract: A passive power generation system comprised of a magnification device for magnifying energy and a recovery device operatively coupled to the magnification device for recovering at least a portion of the magnified energy and a method for making the passive power generation system for magnifying and recovering energy.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: December 17, 2013
    Assignee: Energy Magnification Corporation
    Inventor: Sean N. Grimes
  • Patent number: 6246209
    Abstract: The present invention relates to a control of an AC motor, and in particular to a control device for an AC motor which can prevent an overvoltage from being applied to the motor, and minimize voltage consumption of a reactor itself during the starting and accelerating operation of the motor, by restricting a sharp increase of a motor line voltage resulting from a high-speed switching of an inverter during a high-speed operation of the motor, and a voltage reflection phenomenon of input terminals of the motor generated due to non-matching of a characteristic impedance between a power line and the motor, by inserting the reactor having a bar shaped core between the inverter and the motor.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: June 12, 2001
    Assignee: LG Industrial Systems Co., Ltd.
    Inventor: Han Jong Kim
  • Patent number: 5523677
    Abstract: A DC current sensor has a detecting core with a plurality of detecting core members adapted to be divided in a circumferential direction for receiving the lead wire. A pair of annular exciting cores on one of said detecting core members formed of saturable magnetic material has a core intersection inter-connected perpendicularly to the circumferential direction of said detecting core members, and are disposed oppositely in spaced relation with said detecting core members to magnetically saturate a portion thereof by a magnetic flux produced substantially in the perpendicular direction against a magnetic flux in the circumferential direction, produced by the DC current flowing through said lead wire being detected, and to interrupt a magnetic path by the magnetic flux in the circumferential direction periodically. Exciting coils are wound around the exciting cores in negative-phase excitation.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: June 4, 1996
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Makoto Kawakami, Shigeru Yamaguchi
  • Patent number: 5508606
    Abstract: Direct current can be measured by passing a conductor carrying the current through the core of a toroidal transformer having a bias winding and a sensing winding. A pulse generator send pulses of magnetization current through the sensing winding so that the magnetization current produces a magnetic flux in the core which opposes a magnetic flux produced by the direct current carried by the conductor. A sensing circuit, connected to the sensing winding, detects the level of current through that winding to produce a measurement of the direct current carried by the conductor. A constant direct current is applied through the bias winding to increase the magnetic flux produced by the direct current carried by the conductor. Biasing the magnetic flux enables even small currents flowing through the conductor to be measured. Another version of the current sensor uses two transformers to measure direct current flowing in either direction in the conductor and provides an indication of that current's polarity.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: April 16, 1996
    Assignee: Eaton Corporation
    Inventor: Lawrence J. Ryczek
  • Patent number: 4928020
    Abstract: Saturable inductor and transformer for magnetic compression of an electronic pulse, using a continuous electrical conductor looped several times around a tightly packed core of saturable inductor material.
    Type: Grant
    Filed: April 5, 1988
    Date of Patent: May 22, 1990
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Daniel L. Birx, Louis L. Reginato
  • Patent number: 4845384
    Abstract: Dynamic logic units utilize magnetic cores of rectangular hysteresis loop material wound with an input winding, a pair of output windings connected to a CMOS flip-flop, and a d-c control winding. With a d-c current on the control winding, the core experiences flux reversals in response to a square wave on the input winding to generate output pulses which alternately switch the flip-flop to produce a square wave output which matches the input. In a first embodiment, the output windings are in the form of a center-tapped winding with the center tap grounded to provide a low impedance discharge path for the capacitors in grounded R-C filters on the inputs to the flip-flop which suppress voltage spikes. In a second embodiment, output windings on separate magnetic cores which share an input windings but only one of which has a control winding, are connected in opposition to eliminate the switching spikes in the signal applied to the flip-flop.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: July 4, 1989
    Assignee: Westinghouse Electric Corp.
    Inventor: James M. Vandzura
  • Patent number: 4652771
    Abstract: An oscillating flux transformer for transforming relatively large blocks of electrical power at power frequencies in direct accordance with the turn ratio of toroidal primary and secondary windings. The transformer includes a core-coil assembly having a poloidal winding in addition to primary and secondary toroidal windings, with the poloidal and toroidal windings being disposed on a magnetic core which is in the form of a closed loop or torus. Direct current in the poloidal winding establishes an equilibrium position of a saturation induction phasor. The AC flux produced by the toroidal primary winding combines vectorially with the DC flux to cause the induction phasor to oscillate about the equilibrium position, with an angular excursion responsive to the magnitude of the voltage applied to the toroidal primary winding.
    Type: Grant
    Filed: December 10, 1985
    Date of Patent: March 24, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Theodore R. Specht, Robert M. Del Vecchio
  • Patent number: 4638177
    Abstract: A rotating flux transformer which includes a magnetic core having poloidal primary and secondary windings and toroidal primary and secondary windings. Quadrature flux is produced in the magnetic core by connecting one end of the poloidal primary winding to the center of the toroidal primary winding. The quadrature flux combines vectorially to produce a rotating induction vector in the magnetic core.
    Type: Grant
    Filed: November 14, 1985
    Date of Patent: January 20, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: David S. Takach, Rao L. Boggavarapu, Ram R. P. Sinha
  • Patent number: 4595843
    Abstract: A transformer utilizing a rotating flux for saturating the entire core. The transformer uses a core configured such that a vector sum of the induction produced by two windings in the core rotates through 360.degree.. This is accomplished by arranging the component induction vectors to be perpendicular and the source voltages associated with each of the component induction vectors to be 90.degree. out of phase. If the inductions are of equal magnitude and the vector sum is sufficient to saturate the core, rotation of the vector sum saturates the entire core and the transformer experiences a very low or nearly negligible hysteresis losses. Various topological configurations for the core, including a toroid, are described. The transformer windings can be arranged for single, two-phase, three-phase, or multi-phase operation.
    Type: Grant
    Filed: May 7, 1984
    Date of Patent: June 17, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Robert M. DelVecchio, Robert F. Krause
  • Patent number: 4424459
    Abstract: A high frequency switching circuit comprised of a single-ended switching circuit, rectifying-smoothing circuit and magnetic amplifier which is connected between said single-ended switching circuit and rectifying-smoothing circuit. The magnetic amplifier includes a saturable reactor which has a coercive force Hc of 0.6 Oe or above and a rectangular ratio Br/Bs of 80% or below at an operating frequency of 20 kHz. The saturable reactor is prepared from an amorphous magnetic alloy having a composition of(Co.sub.1-a-b-c Fe.sub.a Ni.sub.b M.sub.c).sub.1-d X.sub.dwhere:M=one element selected from a group consisting of the elements of Nb, Cr, Mo, V, Ta, Ti, Zr and WX=B or a compound of B and Si in which the content of Si is set at 25 atomic % or less0.04.ltoreq.a.ltoreq.0.150.ltoreq.b.ltoreq.0.100.005.ltoreq.c.ltoreq.0.100.15.ltoreq.d.ltoreq.0.30.
    Type: Grant
    Filed: June 22, 1982
    Date of Patent: January 3, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Koichiro Inomata, Michio Hasegawa, Toshihiro Onodera