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| Number | Title | Issue Date |
| 7880577 | Current doubler rectifier with current ripple cancellation A ripple reduction circuit for use in a current doubler rectifier has first and second inductors coupled via a first coupling coefficient. The first and second inductors generate a first and a second ripple current, respectively. A third inductor is coupled to the f... | 02/01/2011 |
| 7412766 | Method of fabricating coil-embedded inductor A method of fabricating a coil-embedded inductor provides steps for obtaining uniform density of coil-embedded inductor. The cavity of a first die is filled with dust before being flipped, and then filled with dust a second time. The dust in the cavity is pressed on... | 08/19/2008 |
| 7295094 | Low profile magnetic element A low profile magnetic element used in cooperation with a multilayer printed circuit board has two or more core arms penetrating the board from one outer surface to the other and a series of magnetic core elements, at least one on each side of the board, bridging pa... | 11/13/2007 |
| 7280026 | Extended E matrix integrated magnetics (MIM) core A matrix integrated magnetics (MIM) “Extended E” core in which a plurality of outer legs are disposed on a base and separated along a first outer edge to define windows therebetween. A center leg is disposed on the top region of the base and separated from the o... | 10/09/2007 |
| 7061356 | Controllable transformer A controllable transformer device comprising a body of a magnetic material, a primary winding wound round the body about a first axis, a secondary winding wound round the body about a second axis at right angles to the first axis, and a control winding wound round t... | 06/13/2006 |
| 7042323 | Signal transformer and method for operating such a signal transformer A signal transformer having a primary limb and a first secondary limb is specified, a primary winding at least partly enclosing the primary limb and a secondary winding at least partly enclosing the first secondary limb and the primary limb being connected to the fi... | 05/09/2006 |
| 7012414 | Vertically packaged switched-mode power converter A vertically packaged cellular power converter solves the problems associated with conventional designs and paves the way for a cellular circuit architecture with ultra-low interconnect resistance and inductance. The vertical packaging results in a power flow in the... | 03/14/2006 |
| 6980450 | High power density inverter and components thereof A compact high-power pure-sinewave inverter amenable to mass manufacturing techniques. Methods for increasing the power rating, power density and/or power conversion efficiency of a sinewave-modulated pulse-width-modulated (PWM) inverter having a either half-bridge ... | 12/27/2005 |
| 6965291 | Circuit component and transformer device with controllable impedance and with systems equipped with such devices A circuit component (L1) with controllable impedance, includes a body (1) of a magnetizable material, a main winding (A1) wound round the body (1) about a first axis and a control winding (A2) wound round the body (1) about ... | 11/15/2005 |
| 6938325 | Methods of fabricating electromagnetic meta-materials In one embodiment, a method for fabricating electromagnetic meta-materials includes applying first and second array of electromagnetically reactive patterns to first and second non-conducting surfaces, wherein the first array includes at least one of a split ring re... | 09/06/2005 |
| 6885274 | Inductor module including inductor windings wound on a common inductor core An inductor module includes a common inductor core, and first and second inductor windings. Each of the first and second inductor windings has an input end, an output end, and an inductor winding section disposed between the input and output ends. The inductor windi... | 04/26/2005 |
| 6880228 | Method for manufacturing a three-phase transformer A three-phase transformer and a method of its manufacture are presented. The transformer comprises a magnetic circuit and three coil blocks. The magnetic circuit comprises two spaced-apart, parallel, plate-like elements; and three spaced-apart, parallel column-like ... | 04/19/2005 |
| 6774758 | Low harmonic rectifier circuit Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inducto... | 08/10/2004 |
| 6608544 | Reactor A reactor in which two first cores 1 made of lamination and I-shaped and two second cores 2 made of lamination and I-shaped are disposed such that the two first cores are parallel to each other, the two second cores are parallel to each other and that the... | 08/19/2003 |
| 6573820 | Inductor An inductor of the invention is obtained by forming conductors of a desired shape on bendable plate type support members, providing a slit in one end of each of the conductors, and a claw on the other end of each of the conductors, bending the plate type ... | 06/03/2003 |
| 6426610 | Controlled ferroresonant constant current source A controlled ferroresonant constant current source includes a ferromagnetic core accommodating the below-mentioned inductors. An input coil is to be connected to an alternating voltage source. An output coil is inductively coupled to the input coil, and i... | 07/30/2002 |
| 6211749 | Impedance matching device An impedance matching device provided between a high-frequency generator and a load device matches an impedance of the high-frequency generator with an impedance of the load device and includes at least a coupled circuit which comprises a core, and a main... | 04/03/2001 |
| 6049266 | Single-phase three-wire type transformer A single-phase three-wire type transformer which forms secondary coils by duplex coils winding two conductors in parallel according to the division intersection connection and can reduce currents circulating inside of a circuit of the transformer, thereby... | 04/11/2000 |
| 5886507 | Controlled ferroresonant transformer A ferroresonant transformer includes a three-legged magnetic core. The core includes a center leg, and first and second flanking legs. Each of the center and flanking legs have respective first and second longitudinal ends. The first flanking leg is posit... | 03/23/1999 |
| 5877666 | Stackable, passively-tunable, cost-reduced inductor An inductor (100) optimized for surface-mount vacuum-pickup automated circuit assembly eliminates the expense of an inductor housing. The inductor has a hollow rectangular ferrite core (101) and a winding defined by a stripline (102) deposited on the core... | 03/02/1999 |
| 5841335 | Choke coil A choke coil for preventing harmonic distortions, used with home-use and industrial electronic apparatuses, is designed to reduce the apparatus size, reduce leakage fluxes and realize superior high-frequency characteristics. In order to achieve this objec... | 11/24/1998 |
| 5764127 | Inductive transmitters for conductor location Two vertical, parallel, horizontally spaced signal coils are connected in series but in opposite phase across an a.c. source. Thus a buried conductor located centrally beneath the coils experiences an alternating magnetic field whose strength is due to th... | 06/09/1998 |
| 5754086 | Transformer unit and coil case and coil bobbin for use therefor For use with a transformer unit comprising a main housing accommodating a transformer, a coil case is provided which encloses a high-voltage coil and the magnetic core section around which said coil is mounted. Only the interior space of the coil case is ... | 05/19/1998 |
| 5726611 | EMC filter for a balanced multi-wired telecommunication line with bifilar windings An EMC filter for a balanced multi-wired telecommunication line has an oblong closed magnetic path core 50 having at least one first core arm 50a with a first length and second core arms 50b with a second length which is equal to or shorter than the first... | 03/10/1998 |
| 5719544 | Transformer with controlled interwinding coupling and controlled leakage inducances and circuit using such transformer A transformer in which a magnetic medium provides flux paths within the medium, two or more windings enclose the flux paths at separated locations along the paths, and an electrically conductive medium, arranged in the vicinity of the magnetic medium and ... | 02/17/1998 |
| 5659461 | Switching power supply using printed coil type transformer An indirect feedback type flyback converter that compares favorably with the direct feedback type flyback converter in controllability of secondary output voltage, wherein the converter is arranged so that a switching signal, which is induced in a seconda... | 08/19/1997 |
| 5600293 | Integrated magnetic exploding foil initiator fire set An integrated magnetic exploding foil initiator fire set includes a DC-DC converter with a first transformer, a triggering mechanism with a second transformer, and an integrated magnetic structure for the respective transformers. Inductive interference is... | 02/04/1997 |
| 5587694 | Reactor with core gap spacers Two sets of a combination of an iron core formed of laminated strip-shaped electromagnetic steel plates and a coil are arranged in parallel, and these are abutted via core gap spacers against two iron cores formed of laminated trapezoidal electromagnetic ... | 12/24/1996 |
| 5572180 | Surface mountable inductor A multi-tapped surface mount inductor (300) providing high quality factor (Q) and high inductance is capable of being surface mounted on any of its four sides. An inner substrate layer(s) (322) is provided with metallized patterns (328, 332) and vias (336... | 11/05/1996 |
| 5565836 | Nullification of magnetic fields relative to coils The internal and/or external magnetic fields of a coil are nullified to ad structurally detrimental Lorentz Forces and/or environmentally hazardous magnetic fields, in accordance with preestablished design objectives.... | 10/15/1996 |
| 5565835 | Substantial nullification of external magnetic fields and lorentz forces regarding toroidal inductors Main and supplemental windings are combined in a toroidal inductor to subntially nullify Lorentz Forces on the main winding and the magnetic field thereof which passes externally from the inductor.... | 10/15/1996 |
| 5537089 | Three phase transformer with reduced harmonic currents A transformer comprising a core, a plurality of primary coils and a plurality of secondary coils, the core having three sections arranged in a generally triangular configuration forming three vertices, the coils being disposed on the core about respective... | 07/16/1996 |
| 5521572 | Unshielded air-coupled current transformer An air-coupled current transformer is provided with a primary current conductor and two secondary coils connected such that the emf induced in each coil by an external disturbing magnetic flux is subtractive, whereas the emf induced by the current in the ... | 05/28/1996 |
| 5508673 | High frequency transformer apparatus A transformer designed for 1:N voltage transformation (where 1:N may be any rational number) at high frequencies (such as over 7 megahertz) can achieve acceptable frequency response and attendant improved values of signal attenuation and signal distortion... | 04/16/1996 |
| 5457873 | Method for mounting an electrical coil on a magnetic circuit with an air gap Plane sheets which have the same shape as the magnetic circuit and are relatively movable along their contact surface are arranged in a stack. The stack is grasped and part of the circuit is bent out of alignment with the plane of the sheets to enable a c... | 10/17/1995 |
| 5422620 | Transformer 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... | 06/06/1995 |
| 5422619 | Common mode choke coil A common mode choke coil having a couple of cores shaped like U and four coils wound around legs of the cores. The cores having coils around their legs are butt-jointed at the end, and coils wound around each couple of butted legs cause magnetic fluxes in... | 06/06/1995 |
| 5400006 | Current transformer with plural part core A current transformer comprising a primary conductor means 20, secondary conductor means in the form of a first and second coil 21, 22 connected to ensure common-mode rejection of emf induced by external disturbing magnetic fields, and magnetic coupling m... | 03/21/1995 |
| 5390349 | Plural transformers with elongated cores A manner of using a plurality of transformers having cylindrical cores such that operation of the transformers at high frequencies allows the cores of the transformers to be disposed parallel to each other and in relatively close proximity without substan... | 02/14/1995 |
| 5319343 | Integrated magnetic inductor having series and common mode windings An integrated magnetic filter inductor having series and common mode windings includes a magnetic core (44) having a first leg (46), a second leg (48), and a third leg (50). The first leg (46) is connected to the second leg (48) with bridging structures (... | 06/07/1994 |
