Abstract: A transformer which has a core, a wire for a primary coil and two wires for a secondary coil. The wire for a primary coil and one of the wires for a secondary coil are wound around a body of the core together, that is, are bifilar-wound. The other wire for a secondary coil is single-wound around the bifilar-wound wires. The two wires for a secondary coil are connected in series to form a secondary coil, and the wire for a primary coil forms a primary coil by itself.
Abstract: An induction device for high radio frequency signal distributor which is able to act as a right signal distributing induction device on the right side of the high radio frequency signal distributor and act as a left signal distributing induction device on the left side of the high radio frequency signal distributor. Accordingly, the induction device comprises a pair of conductive cores and a plurality of enamel copper wires or insulated copper wires intertwined around the two cores in predetermined manner for accommodating high radio frequency signal distributor so as to enable the transmission frequency range of radio frequency signal distributing circuit to extend to 1000 MHz. Thus the number of channels of cable TV can be increased.
Abstract: A transformer including a core; a concentric inner primary tube passing through the core and running up and over at least a portion of the core, the concentric inner primary tube defining a longitudinal axis within the core; and a concentric outer secondary tube passing through the core and running up and over the concentric inner primary tube, the concentric outer secondary tube defining a longitudinal axis within the core and being spaced apart from the concentric inner primary tube, the longitudinal axis of the concentric inner primary tube and the longitudinal axis of the concentric outer secondary tube being aligned with one another so as to be coaxial. The concentric outer secondary tube substantially encloses the concentric inner primary tube so as to provide a low impedance shield.
Abstract: The invention is directed to an ignition coil for an internal combustion engine which includes a columnar member having a plurality of magnetic plates, e.g., silicon steel plates stacked one on the other, each of which is a flat plate with its opposite ends having a width greater than that of its middle portion. Each silicon steel plate has a middle portion whose width is gradually increased from the plates placed at the opposite sides of the columnar member to the plate placed in the center of the columnar member, to form a circular cross section. Whereas, the opposite end portions of the columnar member have a rectangular cross section which is greater in area than the circular cross section of the middle portion, respectively. A plurality of recesses are formed on one side of each steel plate, and a plurality of protrusions are formed on the other side of each steel plate.
Abstract: A noise absorbing device is adapted to prevent radiation noise or induction noise from a cable connected to an electronic apparatus. A pair of holder segments (11 and 12) receive core pieces (20) in receiving recesses and are coupled by hinge portions (19) so as to be brought into butt contact with each other so that the pair of core pieces (20) form a cylindrical body with a cable extending therethrough. Elastic pieces (31) are interposed between the pair of core pieces (20) and the pair of holder segments (11 and 12) in order to provide an elastic force to the core pieces (20) so that the core pieces are slightly protruded from opening edges of the holder segments (11 and 12). When the pair of holder segments (11 and 12) are brought into butt contact with each other, the pair of core pieces (20) are put into press contact with each other by the elastic force of the elastic pieces (60).
Abstract: A transformer includes a bobbin having main and auxiliary bobbin regions (11, 12) separated by an intermediate collar (14) and has primary and secondary windings (16, 17) wound around the main bobbin region (11). A part of the primary or secondary windings (16, 17) or a different winding (18) having a small number of turns other than the primary and secondary windings (16, 17) is wound around the auxiliary bobbin region (12). At least one of the primary and secondary windings (16, 17) is prepared from a winding wire having reinforced insulation of a multi-layered structure. One of the primary and secondary windings (16, 17) which is prepared from the winding wire having reinforced insulation has its lead-out ends opposite to each other which are led through the auxiliary bobbin region (12) to terminal pins (8A) and are then soldered thereto.
Abstract: A low profile transformer comprises a support member for supporting a coil winding, a first elongated conductive tape forming at least one conductor having lead terminals formed integral therewith formed into a first coil of multiple turns, a second elongated conductive tape having lead terminals formed integral therewith forming at least one conductor formed into a second coil of at least one turn interleaved with the first coil, and each terminal lead of each of the tapes extending from the support member and having a portion disposed at a base of the transformer for engagement and surface bonding to a PC board.
Abstract: A transformer core-coil frame attachment and ground. The core-coil is mounted on a metal frame with flanges extending along the bottom of the frame. Nonconductive support members in the form of channels are mounted on the flanges of the cross member to support the coil to relieve stresses and reduce the no-load electrical losses. The nonconductive support members have a profile shaped for ease in receiving and retaining the support members on the flanges of the cross member. The frame has an opening in the bottom for receiving a mounting boss protruding above the tank bottom of the transformer to locate the core-coil within the tank and resist movement of the core-coil within the tank in a horizontal plane. A compressible grounding structure is attached to the bottom of the core which allows for variation between the core and frame.
October 21, 1996
Date of Patent:
November 4, 1997
ABB Power T&D Company Inc.
Herbert S. Adkins, Dennis J. Struemph, Dean I. Parker, Thomas A. Ward
Abstract: A power transformer is formed of a pair of cores having wiring storage portions, at least one primary winding formed of a spirally wound flat ring having a pair of primary leading portions, at least one secondary winding formed of a flat plate, at least one spacer interposed between the flat ring and the flat plate, and an insulation member mounted in the wiring storage portions of the cores. The flat ring, flat plate and at least one spacer for insulating the flat ring and the flat plate are housed in the insulation member. The insulation member has an opening for allowing the primary leading portions to pass therethrough. In order to insulate the primary leading portions from burrs of the secondary winding, a protrusion may be formed on an outer periphery of the spacer to be located under the primary leading portions, or a cut-out portion may be formed in the flat plate.
Abstract: A wind type coil has a core with a flange whose bottom surface has a recess, and an electrode is formed on the bottom surface of the flange and is extended to the recess. A wire is wound around a body of the core, and an end of the wire is welded to the electrode in the recess by thermocompression bonding or resistance welding. The wind type coil is armored by a resin armor, part of the electrode on the bottom surface of the flange being kept bare.
Abstract: A method for the manufacture of a rotary transformer in accordance with the present invention comprises the steps of forming two cylindrical stator ferrite blocks with the same inner diameter but different outer diameters and two cylindrical rotor ferrite blocks with different inner diameters but the same outer diameter; smoothly grinding the inner and outer surfaces of the above cylindrical rotor and stator ferrite blocks and cutting them into a plurality of rotor and stator rings, respectively; applying a bonding agent to the top and the bottom surfaces of the rotor and stator rings and layering them in order to thereby form a plurality of rotor channel grooves and stator channel grooves; inserting a catalyst between the layers that form the stator and rotor channel grooves; heating and pressing together the layered rotor and stator rings in a furnace; and, after heating and pressing, threading the coils into the channel grooves and combining the rotor and stator transformers to thereby complete the rotary
Abstract: A bobbin assembly provides means for mounting two coils in concentric relationship with one another for use in electrical devices such as solenoids, relays, and transformers. The bobbin assembly comprises inner and outer hollow, cylindrical spools each having a coil of wire wound thereon prior to being assembled with one another by moving the inner spool into the hollow interior of the outer spool. Alignment members extending axially from the inner and outer spools engage one another to maintain the spools in their concentric relationship and also provide wire guide means routing the ends of the coil wires away from the spools and terminating them in a manner facilitating connection of the coils to associated electric circuits.
Abstract: The subject invention provides an inductor mounting assembly that is easy to assemble into any mounting scheme and which assures that an adequate clamping force to overcome vibration forces is provided.In one aspect of the present invention, an inductor mounting assembly is provided. The inductor mounting assembly includes an inductor assembly, a spacer assembly adapted to receive the inductor assembly, a wedge member for engaging one side of the inductor assembly and for distributing a clamping force substantially evenly about the inductor assembly, and a bushing disposed through each of the inductor assembly, the spacer assembly, and the wedge member, such that when a clamping force is applied to the wedge member, the inductor assembly is clamped to the spacer assembly.
Abstract: An electronic surface mount package provides a one piece construction package (with an open bottom) with one or more terminal pins molded into the package. Each of the pins have a notched post upon which a wire is wound which is from a toroid transformer carried within the package. Each of the posts are notched so their respective wires are separate from one another so as to prevent arcing. The case is opened at the bottom which prevents harm from expansion or cracking.
August 10, 1995
Date of Patent:
August 12, 1997
Halo Electronics, Inc.
Peter Lu, Jeffrey Heaton, James W. Heaton, Peter Loh Hong Pao, Robert Lake Hang Lam, Tsang Kei Sun
Abstract: An inductive charging coupler for use in an inductive charging system that minimizes damage thereto caused by shock. The charging coupler comprises a housing, and a magnetic core disposed in the housing that is comprised of a plurality of sections. A primary winding is disposed around the magnetic core, A current conductor is coupled to the primary winding for coupling current thereto. By employing smaller sections of ferrite material to form the magnetic core, there is less potential for encountering broad differences in the crystal structure of the ferrite material. These structural differences can cause the ferrite material to be more prone to crack or shatter under stress conditions, such as if the coupler is dropped during use. Also smaller ferrite pieces are lighter than a single piece of ferrite material, which causes lower distributed loads due to a shock.
April 29, 1994
Date of Patent:
June 17, 1997
Delco Electronics Corp.
John T. Hall, Herbert J. Tanzer, George Woody
Abstract: A line filter includes a magnetic core having a leg. A bobbin is placed around the leg of the magnetic core. The bobbin has end collars provided with projections respectively. A pair of windings are provided on the bobbin. A molded casing made of resin houses the magnetic core, the bobbin, and the windings. The casing has movable tongues which engage the projections on the bobbin collars to fix the bobbin to the casing. The casing has inner surfaces formed with ribs which engage the magnetic core to fix the magnetic core to the casing. The casing has an L-shaped movable member extending from a ceiling thereof and engaging the magnetic core to fix the magnetic core to the casing.
August 30, 1996
Date of Patent:
June 3, 1997
Matsushita Electric Industrial Co., Ltd.
Abstract: A choke call includes a bobbin, a pair of windings wound around the bobbin, and two magnetic cores. The bobbin has a rectangular barrel in which a circular hole is defined. The two magnetic cores are partly inserted into the hole of the barrel. The hole is offset from the central axis of the barrel. A central collar extends perpendicular to and at the central portion of the barrel. Two end collars extend beyond and parallel to opposite ends of the barrel. The thickness of the central collar is approximately two times greater than that of the end collars. The magnetic cores collectively form an opening. Within the opening, the gap between the outer periphery of the central collar and the magnetic cores is greater than that between the outer periphery of the end collars and the magnetic cores. A part of the magnetic cores within the hole has a circular or rectangular cross-section.
Abstract: A choke coil having a sufficient noise eliminating effect against common mode and normal mode noises. The choke coil has a bobbin, a pair of windings wound around the bobbin, and magnetic cores inserted in a rectilinear body portion of the bobbin. The bobbin is constituted by a main body and a cap each of which incorporates a magnetic core. The upper half of those magnetic cores forms a closed magnetic circuit that extends around one of the windings while the lower half forms a closed magnetic circuit that extends around the winding.
Abstract: A coil assembly for use in an inductive apparatus, is comprised of a conductive material, either copper or aluminum, continuously wound around a circular or rectangular shape. At a predetermined number of turns, a terminal or tap is formed in the conductor. The tap is essentially a bump in the conductor that will protrude from the coil and be accessible to make connections to it after the coil assembly is complete. The insulation of the conductor is removed from the outside edge of the bump to form a point of contact. A C-clamp, formed from spring steel or other conductive material, functions to secure an external conductor having a lug attached to an end of conductor to the formed terminal. A bolt through the lug is secured by a tapered depression in the C-clamp that functions as a nut. The C-clamp includes an extension that provides additional pressure between the point of contact and the lug to make an electrical contact with a portion of the formed tap and the lug.
Abstract: In an inductance element which is built in a printed circuit board by forming at least two upper and lower layers of conductive patterns in such a way as to sandwich an insulator layer of the printed circuit board in between them and by interconnecting them by means of through holes (via holes), the inductance element is formed, within a plane orthogonally intersecting the surface of the printed circuit board, in a shape of a rectangularly spiral conductor having at its center an axis parallel to the surface of the printed circuit board. This arrangement enables the inductance element to be formed at the same time as when other conductive patterns of the printed circuit board are formed.