Abstract: The invention relates to a current transformer comprising a primary conductor, a secondary winding and a soft-magnetic core, whereby the primary conductor and secondary winding are electrically insulated from one another and are magnetically intercoupled via the core. In addition, a current to be detected is injected into the primary conductor, and a compensating current is injected into the secondary winding. According to the invention, an additional conductor is provided which is electrically connected in parallel to the primary winding, and which is situated in the area of the core at which a flux rise occurs, whereby the flux rise is at least partially compensated for by the flux elicited by the current flowing in the additional conductor.

Abstract: A high frequency transformer may include an integrated rectifier cell with flat windings and/or slotted copper segments stacked on a core branch to provide alternating primary and secondary windings. This reduces inductance leakage and thus increases the operating frequency of the transformer. Rectifying diodes of the rectifier cell may be arranged according to various configurations between the copper segments, and the collection plates may form one of the rectifier outputs. The other output may be provided by connecting all the midpoints of the windings with conductive spacers pressed together along a first axis. The invention is particularly advantageous in static converters, and, more particularly, in spot welding machines, for example.

Abstract: A magnetic core has a toroidal configuration, formed by winding an iron-based amorphous metal ribbon. Thereafter the core is heat-treated to achieve a linear B-H characteristic. Advantageously, the linear B-H characteristic does not change with the level of magnetic fields applied and the frequency utilized. With such properties, the core is especially suited for use in a current transformer.

Abstract: A low cost method of making a high impedance electrical transformer is disclosed as well as products of such method. The method comprises adding a step during the process of winding a transformer component which imparts higher impedance to the transformer employing such component by causing a portion of the total magnetic flux flowing therein to be shunted through a shunt of transformer steel. Such added step includes placing such shunt against a side of the primary coil and winding the secondary coil around both the shunt and the primary coil and also includes using the same coil form on which the primary coil was wound for winding the secondary coil. Such added step produces a high impedance transformer at a significant cost reduction over prior art methods of making a high impedance transformer.

Abstract: A monolithic transformer compensated circuit with enhanced quality factor without significantly increasing noise levels is presented in this disclosure. The technique uses a monolithic transformer and a current source driving current into the transformer secondary winding to achieve loss compensation in the transformer primary. An ac current which is proportional to, and in phase with the voltage applied to the primary winding can be used to achieve theoretically perfect loss compensation at a given frequency in the RF (GHz) frequency range. Examples of circuit applications that are particularly suited to the technique include Voltage Controlled Oscillators (VCO's), Low Noise Amplifiers (LNA's) and Filters. The technique has the added advantage of reducing power consumption in some applications.

Abstract: A transformer includes at least two magnetically coupled cores with a common axis. The cores have cross sectional configurations transverse to the common axis which are not rectangular. An exciting voltage is to be applied across a first winding provided on one of the cores. A second winding provided on one of the cores includes first and second terminals across which a voltage is to be induced in response to the exciting voltage. A first device provides a relatively higher impedance between the first and second terminals of the second winding. The first device is coupled between the first and second terminals. Third, fourth and fifth windings have respective first and second terminals. The third and fourth windings are would on one of the cores with a first polarity. The fifth winding is would on one of the cores with a second polarity opposite to the first polarity.

Abstract: A conventional braided wire has high direct current resistance and high winding resistance in high-frequency regions, making it impossible to achieve a power conversion transformer having sufficient conversion efficiency. In the present invention, a braided wire is braided from three or more cluster wires, each comprising multiple strands, and is used as winding material for a leakage flux-type power conversion transformer. The braid pitch of the braided wire is set so that the ratio between one-turn winding length and the braid pitch is between 0.5 and 2.5.

Abstract: This invention utilizes hollow core construction to remediate heat saturation that causes inefficient power transmission.

Abstract: An energy transfer element having an energy transfer element input winding and an energy transfer element output winding. In one aspect, the energy transfer element input winding is capacitively coupled to the energy transfer element output winding. The energy transfer element is capacitively coupled to electrical earth. Capacitive displacement current between the energy transfer element input winding and energy transfer element output winding is substantially reduced by balancing the relative electrostatic fields generated between these windings and/or between the energy transfer element and electrical without any additional windings.

Abstract: A controllable transformer device comprising a body (1) of a magnetic material, a primary winding (4) wound round the body (1) about a first axis, a secondary winding (2) wound round the body (1) about a second axis at right angles to the first axis, and a control winding (3) wound round the body (1) about a third axis, coincident with the first axis.

Abstract: The present invention provides a high peak current, low duty cycle, pulse type transformer with two methods of increasing the coupling coefficient between the primary and secondary windings. The first method provides an increased coupling coefficient for a pulse type transformer of a coreless design by increasing the number of secondary turns in proximity to a number of primary turns by providing multiple primary windings and multiple secondary windings configured in layers or winding bays in an alternating secondary, primary, secondary, primary configuration. The second method provides an increased coupling coefficient for a pulse type transformer with a magnetic core that utilizes a non-uniform cross-sectional area along the magnetic path where the cross-sectional area is increased within the primary and secondary windings.

Abstract: A current transformer for alternating current with direct current components is proposed, consisting of at least one transformer core with a primary winding and at least one secondary winding to which a burden resistor is connected in parallel and terminates a secondary circuit with low resistance. The transformer core comprises a closed ring core with no air gap produced from a strip made of an amorphous ferromagnetic alloy that is practically free from magnetostriction and has permeability &mgr;<1400. Particularly appropriate alloys for such a strip ring core have been shown to be cobalt-based alloys consisting essentially of the formula Coa(Fe1-xMnx)bNicXdSieBfCg. where X is at least one of the elements V, Nb, Ta, Cr, Mo, W, Ge and P, a-g are given in atomic % and whereby a, b, c, d, e, f, g and x satisfy the following conditions: 40≦a≦82; 2≦b≦10; 0≦c≦30; 0≦d≦5; 0≦e≦15; 7≦f≦26; 0≦g≦3; with 15≦d+e+f+g≦30 and 0≦x<1.

Abstract: An ignition coil assembly includes a core formed of magnetically-permeable material extending along a main axis, a primary winding disposed about the core, a secondary winding disposed on a secondary winding spool wherein at least one of the secondary winding leads is connected to a high-voltage connector terminal portion of the ignition coil assembly configured for connection to a remotely disposed spark plug, a case formed of electrical insulating material, and a magnetically-permeable shield disposed outwardly of the case. The secondary winding is progressively wound on the secondary winding spool, thereby eliminating failure modes associated with the segment-wound secondary windings, and, eliminating the need for pole pieces in the magnetic circuit, thereby reducing components, cost, weight, and size of the ignition coil assembly.

Abstract: A balun-transformer, which is composed of a balun transition and an impedance matching circuit. Chemical etching is employed in the manufacturing process that is compatible with the common microwave circuit manufacturing process. Using the odd mode analysis and commercial microwave software to design the balun-transformer. It is more accurate and more efficient than the conventional method to make balun-transformer that it can only be designed by experience and experiments. These balun-transformers can be used in UHF and VHF band.

Abstract: A choke coil has small difference of wire wound resistances between coils to obtain sufficient unbalance attenuation amount, superior in workability in winding and reduced leakage inductance and line capacity. The choke coil includes first and second coils divided into first and second segments wound on a single spool disposing intermediate insulations layers between respectively adjacent coil segments. The coil segments of the first and second coils are wound alternately. The first coil segment of the first coil and the second coil segment of the second coil being wound in a first winding number and the second coil segment of the second coil and the first coil segment of the second coil being wound in a second winding number. The second winding number being greater than the first winding number for reducing difference of winding resistance between the first and second coils less than or equal to 4%.

Abstract: In an ignition coil for an internal combustion engine, the primary coil and the secondary coil of the coil unit are fabricated of self-welding wire and fixed in a coil case by an elastic material and an ignition control circuit unit is fixed in the coil case by an elastic material. Similarly, the primary coil and the secondary coil are integrally joined by an adhesive. The terminal of the primary coil and the lead of the ignition control circuit unit are joined together by fusion and the joint is partially molded, while the terminal of the secondary coil and the terminal of a high-tension cord outlet are joined together by fusing and the joint is partially molded. Moreover, the coil case is provided with an inner cap such that the fusing and partial molding of the terminals can be conducted on the inner cap, thereby ensuring a high recycle rate and enabling efficient resource recovery and reuse.

Abstract: A distributed air gap material for a induction device in power systems for minimizing fringe losses, mechanical losses and noise in the core The distributed air gap material occupies a selected portion of the core and is formed of a finely divided magnetic material in a matrix of a dielectric material particles. The air gap material has a zone of transition in which the permeability values vary within the air gap material.

Abstract: The present invention relates to a charging unit used for a contactless transfer of electric power to a mobile unit, a complementary power absorbing device and a charging system. The charging unit transfers by means of an alternating magnetic field electric power from at least one primary winding to at least one secondary winding arranged in said mobile unit, and comprises a substantially U-shaped ferrite core which comprises a base area and two leg areas, each provided with a pole face, and which has the primary winding arranged thereon. In order to provide a charging unit for a contactless transfer of electric power to a mobile unit, an associated power absorbing device and a charging system, which permit an improved magnetic coupling between the primary side and the secondary side and consequently an improved power transfer, the primary winding is arranged on the base area of the U-shaped ferrite core.

Abstract: A circuit configuration, in particular, a switch-mode power supply, includes a transformer device and at least one semiconductor component to provide a particularly space-saving configuration having little susceptibility to interference, and with as little stray inductance as possible. The transformer device is in the form of an electromechanical conversion device, in particular, a piezo-transformer or the like, with, in particular, at least one connection of the transformer device forming a substantially mechanically identical connection to a connection of at least one semiconductor component.

Abstract: A rotary transformer includes a resonant circuit and a coil drive circuit. The resonant circuit includes a resonating capacitor connected to a power MOS transistor, coupled across the primary coil of the transformer. The coil drive circuit includes a diode connected to a power MOS transistor coupled across the primary coil of the transformer. A microprocessor detects changes in the voltage across the primary coil. The resonant circuit is connected and disconnected from the transformer during a power transfer mode and a data transfer mode, respectively. During the power transfer mode, stored energy in the leakage inductance of the primary coil is used for power coupling, via the resonant circuit, instead of being dissipated as heat. The resonant circuit is disconnected from the rotary transformer during the data transfer mode to maximize bandwidth for two-way data transfer between the primary and secondary sides of the transformer.

Abstract: The present invention relates to a current and/or voltage transformer comprising at least one primary circuit P and one secondary circuit S.

Abstract: A rotary transformer includes a resonant circuit and a coil drive circuit. The resonant circuit includes a resonating capacitor connected to a power MOS transistor, coupled across the primary coil of the transformer. The coil drive circuit includes a diode connected to a power MOS transistor coupled across the primary coil of the transformer. A microprocessor detects changes in the voltage across the primary coil. The resonant circuit is connected and disconnected from the transformer during a power transfer mode and a data transfer mode, respectively. During the power transfer mode, stored energy in the leakage inductance of the primary coil is used for power coupling, via the resonant circuit, instead of being dissipated as heat. The resonant circuit is disconnected from the rotary transformer during the data transfer mode to maximize bandwidth for two-way data transfer between the primary and secondary sides of the transformer.

Abstract: A current mode coupler includes a unitary casing, a stub cable connector, a circuit board, a magnetic structure, a wire core holder, an enclosing lid and an E-core situated in a cavity in the unitary casing and an I-core affixed to the enclosing lid. When the enclosing lid is in a closed position, the E-core and the I-core contact, forming a transformer. When electrical current is present in a data bus that is situated within the E-core/I-core arrangement, the coupler magnetically couples the current mode doublets on the data bus to the circuitry enclosed in the unitary casing. The current mode doublets sensed on the data bus is then converted to voltage mode doublets and transmitted to the stub interface. The current mode coupler also receives voltage mode doublets through the stub interface, converts the voltage mode doublets to current mode doublets, and transmits the current mode doublets via the E-core/I-core arrangement.

Abstract: The invention provides a transformer suitable for use in a high frequency semiconductor device, and the transformer can be formed without the use of a conventional core and coils by forming at least two spiral inductors selected from a plurality of spiral inductors on a semiconductor substrate so as to overlap each other substantially in the vertical direction with an interlayer insulator interposed in between.

Abstract: Providing a high-voltage-side terminal with means for preventing a core inserted into a central hole of a bobbin from getting out of position securely fixes the core to the predetermined position, at the time a transformer which is a part of an ignitor is assembled, during the work proceeds from the inserting step of the core to the next step. Thus, at the time the ignitor-integral type bulb socket is assembled, the core hardly moves out of the predetermined position and there is a less possibility that the core gets out of position. Accordingly, this does not require so high machining accuracy of both members and reduces the cost for machining the product as well as for inspecting the dimension control or the like.

Abstract: A transformer includes a bobbin, an I-bar, the first U-core, and the second U-core. The bobbin in a tube shape is wrapped around by a number of windings of copper coil. An I-bar made of high permeable alloy has a first end and a second end. The I-bar is inserted into the bobbin and the first end and the second end of the I-bar protrude outside the tube of the bobbin respectively. A first U-core made of high permeable alloy is placed on one side of the bobbin and a second U-core made of high permeable alloy is placed on the other side of the bobbin. The two ends of the first U-core and the second U-core connect the I-bar through the films and the sunken parts of the first U-core and the second U-core are in opposition to each other.

Abstract: The present invention provides a foil wound low profile power L-C processor. A magnetic winding is disposed within a core. The magnetic winding can be made of one or more sets of conductive foil and insulation film wound together in a spiral pattern. The magnetic winding can also include dielectric film. The magnetic winding can have a center aperture in which a non-magnetic and non-conductive center post can be disposed. The center post can also be divided into portions with a combined length less than the length of the center aperture to form an air gap within the center aperture.

Abstract: Operating device for operating light sources, having at least one inductor in the form of a wound item with wire ends (7, 8), characterized in that the wound item includes a part (1) that both is magnetically active and accomplishes the fixing of the wire ends (7, 8), said part being produced from one material throughout.

Abstract: The objectives of the present invention is to provide smaller, lighter and less expensive structure in a starting device for discharge lamp for car use so as to prevent breakage due to vibrations etc. The device having the following arrangement realizes the above-mentioned objective. A starting device for a discharge lamp comprises a socket for mounting the discharge lamp and starting members such as a starting transformer etc. where the starting transformer comprises a bobbin having a core-less structure and a primary coil and a secondary coil wound around the bobbin.

Abstract: A balun-transformer, which is composed of a balun transition and an impedance matching circuit. Chemical etching is employed in the manufacturing process that is compatible with the common microwave circuit manufacturing process. Using the odd mode analysis and commercial microwave software to design the balun-transformer, It is more accurate and more efficient than the conventional method to make balun-transformer that it can only be designed by experience and experiments. These balun-transformers can be used in UHF and VHF band.

Abstract: The present invention provides a foil wound low profile power L-T processor. A magnetic winding is disposed within a core. The magnetic winding comprises concentric tape windings having at least one terminal and separated by insulating space. The tape windings can be made of conductive foil and insulation film wound together in a spiral pattern. The magnetic winding can have a center aperture in which a non-magnetic and non-conductive center post can be disposed. The center post can also be divided into portions with a combined length less than the length of the center aperture to form an air gap within the center aperture.

Abstract: The present invention provides an electrical steel sheet core for a low-noise transformer capable of effectively lowering noise by suppressing vibration perpendicular to the surfaces of the steel sheets and reducing vibration, and relates to an electrical steel sheet for a low-noise transformer characterized by randomly inserting viscoelastic layers with both viscosity and elasticity into the gaps of the steel sheet lamination layers, and a low-noise transformer formed by using said electrical steel sheet.

Abstract: The proposed modular transformer concept is based on a production process in two steps, which separates the fabrication of the turns from the assembly of the transformer, and thus combines automation potential and flexibility. Both the high-voltage winding and the low-voltage winding are composed of effectively two-dimensional spiral conductor tracks (21,22). These conductor tracks can be produced in a computer-aided manner, and then just need to be stacked and electrically connected. Special insulator layers (11,12) are inserted between the conductor tracks and on the one hand bear the weight while on the other hand providing optimum electrical insulation, so that the distances between the high-voltage and low-voltage conductor tracks can be reduced, and the losses in the conductors as well as the short-circuit impedance of the winding can be decreased.

Abstract: An electronic ballast for discharge lamps with electrode filaments. The ballast contains a frequency-selective device, which suppresses an auxiliary heating current in the electrode filaments during operation of the lamp. Heating of the electrode filaments is possible only within a narrow frequency band.

Abstract: An electromagnetic induction connector 21 includes a primary core 27 and a secondary core 29 having a pair of opposing leg portions 27a, 27b and a pair of opposing leg portions 29a, 29b which are disposed in a manner that the tip end surfaces s of the leg portions 27a, 27b and the tip end surfaces s of the leg portions 29a, 29b are opposed, respectively; a primary coil 33 which is wound around the one leg portion 27a of the primary core 27 and extended from the tip end surface s of the leg portion 27a to simultaneously cover the tip end surface s of the one leg portion 29a of the secondary core 29 disposed in opposite thereto; and a secondary coil 35 which is wound around the other leg portion 29b of the secondary core 29 and extended from the tip end surface s of the leg portion 29b to simultaneously cover the tip end surfaces of the one leg portion 27b of the primary core 27 disposed in opposite thereto.

Abstract: An instantaneous trip power transformer includes a high current main outer winding wound to have one or more turns, for providing the main breaker contact current path and for serving as the transformer primary winding for providing power to the breaker electronic components. The transformer includes a secondary winding configured to provide power to trip circuit electronic components. The secondary winding is wound in a substantially cylindrical shape and has a bore therethrough. The main outer winding is wound around an outer surface of the secondary winding. The secondary winding supplies power to the trip circuitry. A third, or trip, winding is located within the secondary winding bore, and is configured to trip the breaker under electronic control by the trip circuitry. The third winding is wound in a substantially cylindrical shape and is energized by the trip circuitry.

Abstract: A conventional braided wire has high direct current resistance and high winding resistance in high-frequency regions, making it impossible to achieve a power conversion transformer having sufficient conversion efficiency. In the present invention, a braided wire is braided from three or more cluster wires, each comprising multiple strands, and is used as winding material for a leakage flux-type power conversion transformer. The braid pitch of the braided wire is set so that the ratio between one-turn winding length and the braid pitch is between 0.5 and 2.5.

Abstract: A flyback transformer includes a coil having a secondary multi-layered winding. A dividing diode has a plurality of diodes. The diodes are connected between each of multi-layered winding portions of the secondary winding. The respective diodes are connected between the low potential-side and the high potential-side of the secondary winding. A dynamic focus capacitor is connected to an input portion into which a parabolic signal for obtaining a dynamic focus output is input. In one embodiment, the dynamic focus capacitor is disposed near the central portion of the winding length of the secondary winding, that is, near the AC zero potential point.

Abstract: A planar magnetic device with vertically oriented coil windings having a cross-section of a core with a torroidally-shaped winding structure taken transverse to the plane of the winding structure having two adjacent “winding windows” where the coils are present. One or more gaps in the core materials surrounding the windings store most of the energy generated by the inductor. The gap of height of at least one half the height of the winding structure is confined to the area between the winding cross-sections. Furthermore, in another aspect of the invention the gap is filled with a multi-layer structure of an alternating mono-layer of equally sized ferrite particles and a layer of synthetic resin.

Abstract: A slotted coaxial shield for high voltage cylindrical air core transformers is described that controls the electric field stress while permitting the rapid extraction of electric energy stored in the shield to improve the output efficiency.

Abstract: A trigger coil has a primary winding, a secondary winding, a package incorporating therein both the primary winding and the secondary winding, and a common terminal to which one end of the primary winding and one end of the secondary winding are connected. One end of the primary winding is connected to an exit portion of said common terminal at a side to be connected to the circuit substrate, and one end of the secondary winding is connected to an exit portion of said common terminal at a side apart from the circuit substrate.

Abstract: An improved magnetic structure suitable for electronic applications is disclosed. The magnetic structure may be formed on or within a substrate such as a printed circuit board by forming a layer of magnetic material, pattering the layer of magnetic material, and etching the layer to form the magnetic structure. Various insulating layers and/or conductive layers may then be formed over the magnetic structures as part of the substrate. Inductors suitable for use in power supplies may be formed using the magnetic structures of the present invention.

Abstract: A transformer apparatus which can reduce a switching noise current flowing between a primary side ground and a secondary side ground is provided. The transformer apparatus includes a first core having a first primary winding wound around the first core, and second core having the substantially same structure as that of the first core, and having a second primary winding wound around the second core. The second primary winding is connected in parallel to the first primary winding. The transformer apparatus further includes a third core having a secondary winding around the third core, which is entirely and electrostatically shielded by a first conductor housing. The third core is arranged so as to be sandwiched between the first and second cores via first and second electrostatically shielding disks electrically connected to a second conductor housing.

Abstract: An electrical single-phase transformer with a coil and core(s) assembly having a polygon-shaped coil with two or more windings and a central window and a system of magnetic cores which extend through the coil window.

Abstract: The present invention relates to an electrical transformer which includes a primary winding coupled to first and second magnetic circuits. A magnetic flux is driven through the magnetic circuits by the primary winding. First and second secondary windings are also provided, each associated with a respective one of the magnetic circuits and being electrically connected together in series opposition. A closed superconducting fault current winding is also provided to link with the magnetic flux in the second magnetic circuit.

Abstract: Induction heating apparatus has a series inductor between an AC source and a parallel tank circuit.

Abstract: A transformer for connection between a generator and a load may be formed by connecting n transmission lines together, in series at one end and in parallel at the other end. The transmission lines are configured to each have a characteristic impedance of {square root over (RG+L |ZL+L (f0+L |)}, where f0 is the frequency at which each transmission line is one quarter of a wavelength long (quarter-wavelength frequency), |ZL(f0)| is the magnitude of the load impedance at the quarter-wavelength frequency, and RG is the generator resistance. The transformer exhibits a frequency-dependent impedance transformation ratio, allowing a more efficient impedance match of a generator to a load having a frequency-dependent impedance, such as an antenna.

Abstract: A transformer includes a bobbin, an I-bar, the first U-core, and the second U-core. The bobbin in a tube shape is wrapped around by a number of windings of copper coil. An I-bar made of high permeable alloy has a first end and a second end. The I-bar is inserted into the bobbin and the first end and the second end of the I-bar protrude outside the tube of the bobbin respectively. A first U-core made of high permeable alloy is placed on one side of the bobbin and a second U-core made of high permeable alloy is placed on the other side of the bobbin. The two ends of the first U-core and the second U-core connect the I-bar through the films and the sunken parts of the first U-core and the second U-core are in opposition to each other.

Abstract: A boosting transformer for a high-frequency heating apparatus includes an insulation member, and a primary winding and a secondary winding formed at the insulation member and mutually isolated by the insulation member, each winding having a width and a thickness as measured when the winding is stacked, the width being smaller than the thickness. As such, the boosting transformer can be reduced in height to readily ensure a distance for insulating locations having therebetween a large potential difference from each other in the transformer's internal structure in designing a structure in which the transformer is attached to a high-frequency heating apparatus. Thus the boosting transformer can be attached to the high-frequency heating apparatus at a location less restrictively and such designing can be facilitated.

Abstract: A coil former for constructing coil transformers. The coil former comprises a rectangular casing having a central interior cavity. The casing is configured to form the coil for the transformer and connect and align a pair of transformer cores to form a substantially homogeneous transformer core. The casing is further configured to connect the coil leads to the homogeneous transformer core to produce a coil transformer.