Concentric Or Nested Core Elements Patents (Class 336/211)
  • Patent number: 10453603
    Abstract: An inductor damper circuit includes a toroidal inductor having an inductor coil and an inductor housing, and a resistive element configured around a periphery of the inductor coil and having one end connected to the toroidal inductor, where the resistive element is printed on a flexible substrate and configured between the inductor coil and the inductor housing, and the resistive element is integrated with the toroidal inductor.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: October 22, 2019
    Inventors: Harry Chai, Eric A. Carter, John Huss
  • Patent number: 10431366
    Abstract: A noise filter (10) used for a plurality of conducting members (20), the noise filter includes, a ring-shaped core (30) made from a magnetic material, the ring-shaped core is attached to the plurality of conducting members to reduce noise of currents flowing through each of the plurality of the conducting members. The ring-shaped core including: a base core (41) having a plurality of support pillar portions (42) extending outward in radial directions; and a plurality of divisional cores (45) each being placed between two of the plurality of the support pillar portions adjacent to each other in the circumferential direction, and each having two end surfaces connected to end portions of the two of the plurality of the support pillar portions.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: October 1, 2019
    Inventors: Hayato Iizuka, Kazuma Kayo, Hiroshi Aihara
  • Patent number: 9720017
    Abstract: Apparatus and methods are provided for the measurement of power consumption at points of interest, such as circuit breakers, machines, and the like. Accordingly, means are provided for measurement of power consumption for each electrical sub-network that is controlled by a circuit breaker. Each apparatus is enabled to communicate its respective data, in an environment of a plurality of such apparatuses, to a management unit which is enabled to provide finer granularity power consumption profiles. Challenges of measuring relatively low supply currents, wireless operation in an environment of a large number of apparatuses, and self-powering are addressed.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: August 1, 2017
    Assignee: Panoramic Power Ltd.
    Inventors: Adi Shamir, Dan Wijsboom, David Almagor
  • Patent number: 9553495
    Abstract: A wound core formed of a magnetic thin band, an electromagnetic component and a manufacturing method therefor and electromagnetic equipment in which iron loss and cost reduction can be achieved are provided. The wound core is a wound core formed by winding a magnetic thin band in the axial direction. A cutout portion is formed from place to place on an end face of the thin band in the axial direction and the cutout portions are arranged in random directions in the direction of the radius of the wound core.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: January 24, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Zhuonan Wang, Yuji Enomoto, Shigeho Tanigawa
  • Patent number: 9424724
    Abstract: A single turn loop electronic article surveillance (EAS) gate. The gate includes a closed magnetic core, a multi-turn primary winding wound around the core, and a secondary loop passing through the core once. The secondary loop is a self-supporting single turn loop, and the secondary loop is a transmit loop that generates a magnetic drive field for the article detection gate system.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: August 23, 2016
    Inventors: Ronald D. Jesme, Dean M. Dowdle
  • Patent number: 9054572
    Abstract: A wound core formed of a magnetic thin band, an electromagnetic component and a manufacturing method therefor and electromagnetic equipment in which iron loss and cost reduction can be achieved are provided. The wound core is a wound core formed by winding a magnetic thin band in the axial direction. A cutout portion is formed from place to place on an end face of the thin band in the axial direction and the cutout portions are arranged in random directions in the direction of the radius of the wound core.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: June 9, 2015
    Assignee: HITACHI METALS, LTD.
    Inventors: Zhuonan Wang, Yuji Enomoto, Shigeho Tanigawa
  • Publication number: 20150070124
    Abstract: Soft magnetic core, in which permeabilities that occur at least two different locations of the core are different.
    Type: Application
    Filed: April 12, 2013
    Publication date: March 12, 2015
    Applicant: Vaccumschmelze GmbH & Co. KG
    Inventors: Jivan Kapoor, Christian Polak
  • Publication number: 20140240074
    Abstract: A radially anisotropic toroidal magnetic core is fabricated by a method including providing apparatus having a first magnet for providing a radial magnetic field extending across a cavity from an axial spindle to a surrounding second magnetic element, placing a substrate in the cavity, the substrate having a hole fitting around the head of the spindle; and sputter-depositing a film of ferromagnetic material onto the substrate. An alternative fabrication uses a similar fixture to impose magnetic anisotropy by annealing a previously-formed toroidal core. A particular fixture adapted for deposition by electroplating or for applying anisotropy by annealing pre-formed cores applies magnetic fields symmetrically from above and below the cores. Also described are the radially anisotropic core produced by the method, and an inductor having a coil wound on the radially anisotropic core.
    Type: Application
    Filed: September 24, 2012
    Publication date: August 28, 2014
    Applicant: The Trutees of Dart,outh College
    Inventors: Jizheng Qui, Charles R. Sullivan
  • Patent number: 8729998
    Abstract: A three step non-linear transformer core is formed from three sections of laminations each having different widths and cross-sectional areas. A first section of laminations is formed by cross-slitting a generally rectangular sheet or strip of metal. A resulting generally triangular segment is then wound upon a mold to form a first section of a core frame having a trapezoidal cross section. A second section of laminations is wound upon the first section of laminations to form a segment of a core frame having a rhombic cross section. The third section of laminations is wound upon the second section of laminations to form a segment of a core frame having a trapezoidal cross section. Each of the first, second, and third sections of laminations are offset from one another by a predetermined angle of offset.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: May 20, 2014
    Assignee: ABB Technology
    Inventors: Samuel S. Outten, Thomas A. Hartmann
  • Patent number: 7843306
    Abstract: A transformer core includes a stack of a plurality of planar core plates of a magnetically permeable material, which plates each consist of a first and a second sub-part that together enclose at least one opening. The sub-parts can be fitted together via contact faces that are located on either side of the opening and that extend obliquely with respect to the centerline of the core plate. The invention also relates to the use of the described transformer core in a Coriolis flowmeter with the Coriolis tube extending through the opening so as to induce a current in the tube.
    Type: Grant
    Filed: May 8, 2008
    Date of Patent: November 30, 2010
    Assignee: Berkin B.V.
    Inventors: Aditya Mehendale, Wouter Hagedoorn, Joost Lotters
  • Publication number: 20100141372
    Abstract: A pulse transformer includes a core unit and a coil unit. The core unit includes an annular core part, and an annular choke part that is disposed in contact with the annular corepart. The coil unit includes a plurality of coils, each of which is wound around both of the annular core part and the annular choke part.
    Type: Application
    Filed: December 5, 2008
    Publication date: June 10, 2010
    Applicant: Taimag Corporation
    Inventor: Aaron Chen
  • Publication number: 20090066464
    Abstract: An ignition apparatus includes a transformer having a central core, a primary winding disposed thereabout, a secondary winding disposed outwardly of the primary winding, a case configured to house the central components, and an outer core or shield disposed outwardly of the secondary winding. The central core is formed from multiple, low carbon steel wires held together is a cylindrical shape with cured bond coating material such as an epoxy material or an aromatic polyamide material. In one configuration, at least two different sizes of wires are used in forming the core to increase the density of the magnetically-permeable wire material in the core.
    Type: Application
    Filed: September 10, 2007
    Publication date: March 12, 2009
    Inventors: Edgard Wolf, Albert A. Skinner, Colin J. Hamer, Mark L. Whittemore
  • Patent number: 7385466
    Abstract: A first transmission line for transmitting a first signal and a second transmission line for transmitting a second signal, which has the reverse phase of the first signal, are connected in series with a common mode choke coil. A third transmission line and fourth transmission line are each connected in series with the common mode choke coil, and transmit the first and second signals. A semiconductor device is connected in series with the third and fourth transmission lines, so as to transmit and receive the first and second signals. One end of a first terminator is connected in parallel with the first transmission line, and the other end is connected to the common mode choke coil. One end of a second terminator is connected in parallel with the second transmission line, and the other end is connected to the common mode choke coil. The noise eliminating capability of the common mode choke coil is increased by means of this structure.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: June 10, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Suenaga, Osamu Shibata, Yoshiyuki Saito
  • Patent number: 7375610
    Abstract: A transformer includes a magnetic core assembly, a circuit board, a plurality of pins and at least an interface layer. The magnetic core assembly includes a first magnetic part and a second magnetic part. The circuit board is arranged between the first magnetic part and the second magnetic part, and has a winding coil patterns including a primary winding coil and at least a secondary winding coil. The pins have first ends mounted onto the circuit board. The interface layer is arranged between the first magnetic part and the circuit board and/or between the second magnetic part and the circuit board such that the circuit board lies flat on the interface layer and is secured to the first magnetic part or the second magnetic part via the interface layer.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: May 20, 2008
    Assignee: Delta Electronics, Inc.
    Inventors: Jui-Chu Cheng, Tsai-Shen Lin, Su-Chiung Hsu
  • Patent number: 6907872
    Abstract: An ignition coil apparatus for an internal combustion engine does not generate a discharge between a high-voltage terminal and an iron core even if a high-voltage cable falls off from a high-voltage side connector, and the overall height thereof can be reduced. An ignition coil has an iron core disposed in a casing to form a closed magnetic circuit, and primary and secondary coils installed on a part of the iron core. A power switch controls electric power supplied to the primary coil. A low-voltage side connector has a terminal electrically connected with the power switch. A high-voltage side connector has a high-voltage terminal electrically connected with the secondary coil. The casing includes a casing main body accommodating the part of the iron core, the primary and secondary coils and the power switch, and a cover integral with the main body for covering a part of the iron core located outside thereof.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: June 21, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuya Hamada, Takeshi Shimizu
  • Patent number: 6594166
    Abstract: A step up transformer has an inert core, primary windings concentrically surrounding the inert core, and secondary windings concentrically surrounding the primary windings, the ratio of secondary windings to primary windings of up to 1,000,000:1. The step-up transformer is particularly useful in an x-ray catheter having an x-ray source in a vacuum tube and a power source. The power source can deliver a lower voltage which is stepped up at by the transformer to produce a voltage sufficient to stimulate production of x-rays by the x-ray emitter source. Methods for preparing the step-up transformer and x-ray catheter and methods of administering x-rays to subjects with the x-ray catheter of the invention are also disclosed.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: July 15, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventor: Yem Chin
  • Patent number: 6474322
    Abstract: The invention provides an ignition device of a cylindrical shape for an internal combustion engine, in which device it is possible to improves a productivity of a side core and a center core and to improve the efficiency of converting a magnetic flux together with the decreasing of the number of the steps of assembling process. The ignition device comprises a primary coil, a secondary coil, a center core, a side core, all of which are located concentrically in this order from the inside thereof, and a silicon steel strip having a thickness not more than 0.2 mm is used an a material of the side core so that a spirally wound, cylindrical shape is provided. Further, a thin film amorphous silicon steel strip having a flux density B8≧1.4T at a direct current magnetizing force of 800 A/m or a crystallized silicon steel strip having a thickness not more than 0.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: November 5, 2002
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Kiyomi Ubukata, Hiroyuki Tanaka, Eiichiro Kondo
  • Patent number: 6168696
    Abstract: An RF induction coil for inductively coupled ionized sputtering applications having at least one extremely smooth surface, on the order of about 30 &mgr;m or less, which faces, substantially resides within, or is immediately proximate a plasma field in a sputtering chamber. The smooth induction coil requires only an extremely short burn-in time to remove surface damage and contaminants until a steady-state sputtering rate is achieved. The smooth induction coil may be constructed of target material, or a material distinct from the target material, and can be of any suitable geometry or configuration.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: January 2, 2001
    Assignee: Micron Technology, Inc.
    Inventors: Randle D. Burton, Scott G. Meikle, James A. Schindel
  • Patent number: 6018239
    Abstract: A self-powered axial current sensor for generating a signal which accurately represents current in a power line includes, in one embodiment, a housing having a bus bar opening of substantially rectangular shape extending longitudinally therethrough. The housing also includes current sensor core retaining walls which define a current sensor region, and a cover base wall which defines, with one of the retaining walls, a power core region. A current sensor core and coil are located in the current sensor region and are positioned proximate the bus bar opening. The current sensor core and coil also are substantially symmetrical with respect to the center axis of the bus bar opening. The current sensor further includes a power core and a power coil located in the power core region and positioned substantially symmetrically with respect to the center axis of bus bar opening.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: January 25, 2000
    Assignee: General Electric Company
    Inventors: Ertugrul Berkcan, Raymond Kelsey Seymour, Jerome Johnson Tiemann
  • Patent number: 5747981
    Abstract: In one embodiment of the present invention, an inductor comprises a core defining a first electromagnetic path, a second electromagnetic path and a third electromagnetic path, the third electromagnetic path substantially closing the first and second electromagnetic paths. The inductor also includes a first electrical coil wound about at least a portion of the first electromagnetic path and a second electrical coil wound about at least a portion of the second electromagnetic path. Another embodiment of the present invention uses the inductor in an electrical system such as a DC-to-DC converter. Inductors constructed according to the present invention can be used to provide "common mode" inductance and "differential mode" inductance in a single inductor.
    Type: Grant
    Filed: December 2, 1996
    Date of Patent: May 5, 1998
    Assignee: Ford Motor Company
    Inventor: Robert J. Callanan
  • Patent number: 5422620
    Abstract: The so-called delta-phi transformer makes use of the effects of various core materials and air gap sections in the cores on the magnetization curves of core materials. It consists of at least two magnetically separated cores, designated source core SK and regulating core RK, which possess different magnetic properties. At least one coil A, the primary winding, is wound on the cores, which are thereby electrically coupled. Hence, both cores SK and RK are traversed by the same magnetic flux. As a result of their different magnetic properties, different magnetic fields are generated in the two cores SK and RK. A coil B is wound on the source core SK and a second coil is wound on the regulating core RK. Coils B and C are secondary windings and are designed to be connected in an additive or subtractive series circuit, depending on the desired variation in secondary voltage, or to be arranged in open circuit.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: June 6, 1995
    Assignee: Susanne Riedi-Joks
    Inventor: Hanspeter Bitterli
  • Patent number: 5341281
    Abstract: A harmonic compensator comprises a transformer having low leakage reactance connected between a utility and a load and a signal generator which injects into the transformer a signal having a frequency which cancels undesirable higher order harmonics induced by the load. The low leakage reactance nature of the transformer permits injection of high frequency signals which restore the fundamental sine wave of the signal from the utility and thereby eliminates undesirable nonlinear harmonics which cause up-line disruptions. The low leakage reactance transformers may comprise a coaxial structure having a thin hollow tube as the primary coil, a coaxial structure having a single main coaxial cable distributed into several paralleled coaxial cables of smaller diameter, or a co-planar transformer structure having flat strip line conductors wrapped around a conventional core as the primary and secondary coils.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: August 23, 1994
    Assignee: Allen-Bradley Company, Inc.
    Inventor: Gary Skibinski
  • Patent number: 5241293
    Abstract: A flyback transformer includes at least one primary coil and at least one secondary coil formed thereon. Each primary and secondary coil may be a metal plating coil with an insulating bobbin and a conductor formed thereon. Secondary coils may be formed of pairs of metal plating coils connected in series. One to three primary coils may have secondary coils sandwiched therebetween. The transformer may also have a resonance capacitor integrally formed therein, and may have respective rectifying diodes connected between the secondary coils.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: August 31, 1993
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Mitunao Okumura
  • Patent number: 5138545
    Abstract: A hybrid high voltage transformer includes three nesting cylindrical coil forms. The inner coil form supports a primary winding and the two outer coil forms support secondary windings that substantially overlie the primary winding. Each of the secondary winding coil forms includes a plurality of circumferential walls forming individual compartments for supporting a multilayered group of coil turns in a substantially uniform pattern over the coil form. The outer coil form includes an upraised central portion to permit tapping of the secondary winding thereon for a DC focus voltage at AC ground. The coil forms include protrusions for supporting connection posts for making electrical connections and supporting electrical components. The two secondary windings are wound in opposite directions.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: August 11, 1992
    Assignee: Zenith Electronics Corporation
    Inventor: Theodore J. Godawski
  • Patent number: 5075150
    Abstract: In one embodiment, the pack is torsionally flexible. Pack of laminations comprises laminations which are connected one to another by only a single connection. The single connection is provided by a projection which projects into a depression. The projection has a height which is greater than 50% of the thickness of the lamination and the depression has a depth which is greater than 50% of the thickness of the lamination. The depression and projection are produced by a projection punch which cooperates with a die. The die has a lip which is either radiused (r) or conical (C) and the punch causes the metal of the lamination to be extruded past the lip into the die while the depression is being formed. The radiused or conical lip allows the height of the projection and the depth of the depression to be greater than the normal 50% shear stress fracture depth/height.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: December 24, 1991
    Assignee: Linton and Hirst
    Inventors: Charles H. Webb, William G. French
  • Patent number: 5012179
    Abstract: A flyback transformer includes a film wound unit which is composed of a first and second film sheets on which a first and second conductors are formed. A primary coil is formed by the first conductor, and a resonance capacitor which is connected to the primary coil is formed between the first and second conductors. A plurality of secondary coils are sequentially formed, and rectifying diodes are respectively connected between the respective secondary coils. Each of the secondary coils may be a metal plating coil.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: April 30, 1991
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Mitunao Okumura
  • Patent number: 4967121
    Abstract: A high voltage transformer for a video apparatus provides electrical isolation between the primary and secondary windings. The primary winding is wound on a first bobbin while the secondary windings are wound on a second separate bobbin that surrounds the first bobbin with the bobbin structure providing a physical isolation barrier. The high voltage winding is wound on a high voltage bobbin which fits over the primary and secondary bobbin structure.
    Type: Grant
    Filed: August 4, 1988
    Date of Patent: October 30, 1990
    Assignee: RCA Licensing Corporation
    Inventor: Leroy W. Nero
  • Patent number: 4835497
    Abstract: An ac line filter comprises two main cores, at least one auxiliary core disposed between the two main cores, and a pair of windings provided on the main and the auxiliary core. The main cores form shell type closed magnetic paths and enclose the auxiliary core, which forms a closed magnetic path, when the two main cores are placed one over the other. Each of the windings is wound in a concentrated manner to surround both the inner core of the main core and the auxiliary core at a location where the auxiliary core is positioned beside the main core, and is wound in a spaced manner around the inner core of the main core at a location where the auxiliary core is not positioned adjacent the main core. Each winding is divided at the center thereof and the divided ends of one winding are cross-connected with the similar divided ends of the other winding.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: May 30, 1989
    Assignees: Nippon Telegraph and Telephone Corporation, Sanritsu Electric Company, Ltd.
    Inventors: Kusuo Takagi, Yuuzaburo Inoue
  • Patent number: 4794360
    Abstract: An inductive device comprising a ferromagnetic core which has two approximately U-shaped core halves (9, 11) connected together with their limbs (9', 11'; 9", 11") facing each other so that they enclose a core window (17). Each core half (9, 11) is constructed substantially from a packet of mutually parallel strips of an amorphous ferromagnetic material. Filling members (21', 21") consisting of a solid non-ferromagnetic material are placed between the free ends of each pair of facing limbs (9', 11'; 9", 11"), and in the space (23', 23") between the ends the filling members extend from the core window (17) in the outward direction over at most half of the width of the core limbs. A decrease of the magnetic permeability of the core material as a result of decreasing temperature is compensated by a decrease of the width of the air gaps (23', 23") between the free ends of the limbs (9', 11'; 9", 11").
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: December 27, 1988
    Assignee: U.S. Philips Corporation
    Inventor: Adrianus J. van Mensvoort
  • Patent number: 4656449
    Abstract: An electromagnet having a ferromagnetic core comprising at least one substantially C-shaped yoke terminating in pole pieces (1,2) with opposed pole faces (7) separated by an air gap in which a magnetic field suitable for an NMR imaging process is, in use, produced, the core comprising stacked laminae (6) of electrical sheet steel, which are bent around the C about axes perpendicular to the plane of the C, and at least some of which are spaced apart at the pole pieces to accommodate between the spaced laminae field modifying elements (5,8) which are arranged to improve the homogeneity and/or confinement of the magnetic field in the air gap.
    Type: Grant
    Filed: January 21, 1986
    Date of Patent: April 7, 1987
    Inventors: J. R. Mallard, F. E. Neale
  • Patent number: 4471333
    Abstract: A current transformer having at least one ring-shaped core with a secondary winding mounted thereon, and a primary conductor, located within its casing. An inner tube is provided between the ring-shaped core and the primary conductor, one end of the tube being electrically connected to the casing and its other parts electrically insulated therefrom. A cylindrical, electrically conductive screening shield at least partially overlaps the inner tube and is electrically connected to the casing on the side of the ring-shaped core which is distal from the electrical connection between the casing and the inner tube, while the other parts of the shield are electrically insulated from the casing. This overlap forms a short-circuit loop for any steep progressing wave which is generated when switching on a potential-free part of the circuitry, or when due to an interruption, a small capacitive current breaks off.
    Type: Grant
    Filed: February 22, 1982
    Date of Patent: September 11, 1984
    Assignee: Sprecher & Schuh AG
    Inventor: Viktor H. Stephanides
  • Patent number: 4338657
    Abstract: A high-voltage transformer-rectifier device comprising a step-up three-phase transformer with a spatial magnetic circuit made up of three vertical stacks (7) of closed cores (9) insulated from one another and secured in an insulating frame (8), having a common window and carrying the sections (10) of a secondary winding (2). A primary winding (1) comprises three flat rectangular coils (11) whose vertical parts are arranged to lie pairwise along the axis of the common window in each stack (7) of the cores (9). A bridge rectifier section comprises individual bridge rectifiers connected to the sections (10) of the secondary winding (2), and each of the potential screens is formed by ring sections (6 and 20) arranged one on top of another along the stacks (7) of the cores (9).
    Type: Grant
    Filed: May 8, 1980
    Date of Patent: July 6, 1982
    Inventors: Vladimir N. Lisin, Mikhail V. Pavlov, Jury V. Laschenov, Stanislav I. Gusev, Lev V. Kozlov, Sergei V. Pokrovsky, Igor I. Mozhaev
  • Patent number: 4288773
    Abstract: A lamp ballast has a pair of adjacent gapped "O" magnetic cores made of nested, almost complete loops of amorphous metal strip with the gaps in the loops shaped and arranged under the secondary coil to simulate any type of restricted cross section for shaping the lamp current. A long slender reactor has a similar configuration in which the gaps are staggered; a different embodiment has a long central core of compressed amorphous metal flake and a helical overwrap of ribbon. An alloy of iron, boron, and silicon with a high B.sub.r /B.sub.s ratio is preferred for these inductive devices.
    Type: Grant
    Filed: December 6, 1978
    Date of Patent: September 8, 1981
    Assignee: General Electric Company
    Inventors: Robert P. Alley, Russell E. Tompkins
  • Patent number: 4031449
    Abstract: A solid state electronic battery charger which is electromagnetically coupled to one or more batteries. A charging circuit energizes a drive winding to produce an alternating field received by an associated coupler and operative to convey charging current to a battery connected thereto. A sense winding monitors the level of the alternating field to derive a signal representative of the battery charge level and which causes a tapered charge to be supplied to the battery and an indication of a sensed fully charged state. A proximity sensor can be provided to denote the presence of a coupled battery and by which charging operation is commenced.
    Type: Grant
    Filed: November 20, 1975
    Date of Patent: June 21, 1977
    Assignee: Arthur D. Little, Inc.
    Inventor: John E. Trombly
  • Patent number: 4024486
    Abstract: A precut nested magnetic core having a locking outer turn. The locking turn is formed of magnetic core steel and has a pair of locking slots in one end and a single locking tab in the opposite end. The precut annular core is locked by using the second or inner slot with the locking tab while the formed annealed core is locked by using the first or outer slot with the locking tab.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: May 17, 1977
    Assignee: General Electric Company
    Inventor: Willi Klappert