Abstract: The present invention provides a power transformer having a low profile and low overall volume. The power transformer also has improved isolation between the primary and the secondary windings, while at the same time providing improved electromagnetic coupling between these windings. The power transformer comprises an insulating enclosure for encapsulating a primary winding wound therein. The secondary winding comprises two electrically connected planar windings stamped from a conductive foil sheet. The insulating enclosure is positioned between the two planar windings of the secondary winding. The power transformer also comprises a core for coupling magnetic flux from the primary winding to the secondary winding.

Abstract: Three phase transformer, e.g. distribution transformer, comprising three frame shaped winding assemblies, each containing primary and secondary windings, two of said assemblies being substantially identical and juxtaposed to form a center leg having substantially circular cross section, and a third winding assembly surrounding the two said assemblies, and forming, together with the outside half legs of said winding assemblies, two outside legs, each having substantially circular cross section, the three winding assemblies being interlinked by hollow, cylindrical cores wound from ferromagnetic strip material and surrounding each of the three legs.

Abstract: An integrated circuit transformer (58) which is constructed in a laminar hion is disclosed. The present invention includes a bottom plate (10) with cores (14) protruding from its upper surface (13) and a top plate (16) with several feed through holes (18). Both plates (10, 16) are made from high permeability magnetic material. Interposed between the top and bottom plates (10, 16) are at least one primary (19) and at least one secondary (40). The primary (19) has feed through holes (22), vertically aligned with the feed through holes (18) in the top (16), holes (20) to allow the cores (14) to protrude through, and tabs (26, 28) for connecting to the input circuit. The primary (19) is made of a laminate clad with an electrical conductor. The circuit which conducts the current around the cores is fabricated by etching special patterns of insulative gaps (24) into the electrical conductor. The secondary (40) has holes (42) to allow the cores (14) to protrude through.

Abstract: A folded conductive film winding transformer provides a plurality of poles and enables increased turns ratios or power handling capacity in structures which must meet severe height limitations.

Abstract: A coil assembly for use in an inductively powered transponder including a primary coil and a secondary coil wrapped around the same coil forming ferrite rod. The primary coil's leads are left floating while the secondary coil's leads are connected to the integrated identification circuit of the transponder. There are approximately three times as many turns to the primary coil as there are turns to the secondary coil. The primary coil is configured to self resonate at the operating frequency of the identification circuit when brought within range of an interrogator's magnetic field, thereby creating a voltage across the primary coil having a high source impedance.

Abstract: In a stationary electromagnetic induction unit according to this invention, a plate-like coil is constituted by a plurality of coil elements wound in parallel. Therefore, a conductor width of the coil element becomes small, and a stray loss caused by a leakage flux vertically interlinked with the surface of the coil element, namely, the plate-like coil is reduced.

Abstract: A conductive film magnetic component such as an inductor or transformer includes a conductive film winding having a generally serpentine configuration when disposed in a plane. This film is folded to form a stack of layers with each "layer" comprising part of a winding turn and with successive "layers" connected at the folds via the continuous conductive film. The conductive film may be self-supporting and coated with a dielectric layer or may be disposed on a dielectric membrane. The film and membrane are preferably patterned photolithographically.

Abstract: A low-profile planar type transformer having a unique bobbin design and a minimum of other pieces. The transformer is assembled by simply stacking all of the pieces, other than core pieces, in a sandwich-like-laminate and placing two appropriately shaped ferrite core pieces around the stack. In the preferred embodiment, the stack consists of the following layers, in the listed order: (a) a first thin dielectric spacer; (b) a first planar member (e.g., a PC board) containing a first winding; (c) two thin dielectric insulators; (d) a first nylon bobbin member; (e) a second planar member containing a second winding; (f) a third thin dielectric insulator; (g) a third planar member containing a third bobbin member; (h) a second nylon bobbin member; (i) two thin dielectric insulator; (j) a fourth planar member containing a fourth widning, and (k) a seventh thin dielectric insualtor.

Abstract: A high frequency transformer is made on a magnetic circuit which can be of a generally square shape. The secondary windings are made on printed circuit plates, separated by insulators and traversed perpendicularly by the core or cores of the magnetic circuit. The primary winding can be wound directly on such a core. The transformer is applicable in particular to high frequency very high voltage power supplies, in particular of the type termed "flyback" power supplies.

Abstract: A high-frequency transformer is constructed from a flexible circuit comprising a primary conductive film winding and one or more secondary conductive film windings disposed on a single dielectric membrane. The flexible circuit is folded to form a stack of primary winding layers interleaved with secondary winding layers and then inserted into a magnetic cup core. The flexible circuit is preferably patterned photolithographically.

Abstract: A chopper power supply includes a transformer having first and second primary winding segments as well as first and second secondary winding segments respectively associated with the first and second primary winding segments. First and second switching transistors respond to a control source so that the first transistor connects the first primary winding segment to first and second opposite polarity terminals of a DC power supply at a time mutually exclusive from the time the second primary winding segment is connected to the DC terminals via the second transistor and vice versa. Each of the secondary winding segments includes first and second portions disposed on opposite sides of the primary winding segment associated with the secondary winding segment. The portions of the first secondary winding segment are connected in series with each other and coupled to the first primary winding segment so that voltages induced in the portions of the first secondary winding segment add together.

Abstract: An apparatus is provided for use with non-contacting torque sensors. Many non-contacting torque sensors use bulky inductive coil structures to induce magnetic flux into the shaft whose torque is to be measured, and to sense a change in magnetic permeability of the shaft in response to torque applied thereto. These large, cumbersome structures are quite expensive to fabricate, and difficult to manufacture and install. As a solution, a flexible, ribbonlike inductive coil structure is provided. The dual layer construction of this coil structure enables it to provide adequate magnetic flux distribution, similar to that of much larger coil structures. Furthermore, the unique layout of the coils results in an efficient, accurate structure for inducing and sensing magnetic flux.

Abstract: A liquid level gauge comprising a core disposed inside a liquid container that has a cross sectional configuration that varies in the direction of its height, the core extending in the vertical direction and isolated from the liquid, a coil wound around the core in the direction of the length of the core, the coil comprising a densely wound portion formed at one end of the core and a thinly wound portion wound around the remaining part of the core, a conductor ring disposed around the outer circumference of the coil and is movable in the direction of the length of the coil according to the liquid level inside the container, a detecting portion that detects the change in the inductance of the coil according to the displacement of the conductor ring, a transforming portion that transforms the change in the inductance of the coil to a change in an electric signal, and a display portion that displays the quantity of the liquid inside te container, corresponding to the electric signal, the thinly wound portion hav

Abstract: A monolithic transformer comprises two windings arranged in a plane with conductors of the windings interleaved with and crossing one another, whereby each winding is symmetrical with respect to a center point of the winding, to which a center tap connection can be made. The conductors of the windings and crossings therebetween can be arranged so that adjacent conductors belong to the different windings for maximum coupling. An unbalanced circuit can be connected between the center tap and one end of a winding, the other end electrically floating, to compensate for the effects of the unbalanced circuit on interwinding capacitance. The transformer can be constructed using air bridge technology with conductors supported by and spaced from a surface of a substrate.

Abstract: A laminated transformer includes a plurality of ferrite sheets having surfaces on which conductor patterns are formed and are laminated and baked to be a sintered body, and a pair of the primary external electrodes and a pair of the secondary external electrodes are provided at end faces of the sintered body. The transformer is used mainly in a high frequency circuit, the conductor patterns formed at the laminated ferrite sheets being used as the primary or the secondary, both ends of the primary conductor patterns being electrically connected to the pair of the primary external electrodes and both ends of the secondary conductor patterns being electrically connected to the pair of the secondary external electrodes, so that the primary and secondary conductor patterns have no coiled construction and no self-distributed capacity, so that the laminated transformer will no induce self-resonance even when used in a high frequency band.

Abstract: A high-power pulse transformer for short, high-voltage and/or high-current pulses includes:a base plate in a container, an insulating, cooling dielectric liquid with a given heat transfer coefficient in the container;at least one magnet core on the base plate with self-enclosed magnet legs around a central window and wide sides with axes normal to the axis of the window;at least an undervoltage and an overvoltage winding in the liquid wrapped in each other around parts of the magnet core immersed in the liquid and linked to the magnet core and to each other, the windings including turns of substantially mutually doubly-wound electrically insulated metallic conductors having winding ends disposed in leadthroughs in the container walls, the conductors having surfaces with a heat transfer coefficient higher than that of the dielectric liquid;the turns of each winding being self-supported and spaced apart from the turns of the other winding by a first minimum spacing and spaced from the magnet core by a second mi

Abstract: A transformer for use in a power converter includes first and second primary windings tightly coupled to a first secondary winding, and third and fourth primary windings tightly coupled to a second secondary winding. Of importance, the first and second primary windings are only loosely coupled to the third and fourth primary windings. In one embodiment of the invention, the transformer includes a plurality of legs. The first and second primary windings and the first secondry winding are wound around one half of one of the legs but not a secnd half of the one leg. The third and fourth primary windings and the second secondary winding are wound around the second half of the one leg but not the first half. In another embodiment of the invention, the transformer includes a U core. The first and second primary windings and the first secondary winding are wound around a first leg of the U core while the third and fourth primary windings and the second secondary winding are wound around a second leg of the U core.

Abstract: An oil burner ignition system includes a transformer primary winding feedback coil and dual secondary coil wound in axially coextensive and mutually coupled relation about a ferrite core. The primary winding and feedback coil are wound continuously about the core and disposed within a bobbin which supports the secondary coil. The primary and feedback coil have a common end connection in circuit with the emitter of a switching transistor. The other end of the feedback coil is connected through a capacitor and resistor circuit to the base of the transistor. The collector and base of the transistor are connected by a circuit to receive unipolar pulses of electrical energy. A resistor is connected between the base and the collector of the transistor to bias the transistor "on". The feedback coil is disposed to have voltage induced therein by changing current flow through the primary winding and the collector-emitter electrodes of the transistor.

Abstract: The invention concerns a coil arrangement with three windings arranged coaxially, where the outer coils are connected in series. The inductances of the outer coils are of equal magnitude and their magnetic fields have opposing polarities.The center winding induces in the series circuit of the outer windings currents which cancel each other out. The outer windings with their stray inductances form a coil which is separated from the center one and can be applied for other purposes.

Abstract: Radio frequency chokes for use in combining and separating radio frequency signals and single phase AC power in the equipment used in cable transmission and distribution systems. The radio frequency chokes include a conductor wound on a magnetic core to form a primary winding upon which first and second swamping circuits are mounted. Each of the swamping circuits include a secondary winding with a resistor connected across the ends thereof with the swamping circuits effectively dampening parasitic resonances in the primary winding which occur in the frequeny range of from about 5 MHz to at least 800 MHz.

Abstract: A coil apparatus for the use of a switching power supply circuit has been found. The coil apparatus having two overlapped coil bobbins has an improved winding arrangement. This arrangement is such that one (P.sub.1) of primary windings which are provided for an inner bobbin are divided into two windings (P.sub.11, P.sub.12) which are electrically coupled with each other, and remaining primary windings (P.sub.2) are sandwiched between the two divided windings (P.sub.11, P.sub.12).

Abstract: The present invention relates to a liquid level meter, comprising a coil having a core, a float which is provided at the external circumference of coil so that it can move in the longitudinal direction along the same core and comprises a conductor ring, a detector which detects change of inductance of coil in accordance with movement of said float namely conductor ring, a converting circuit which converts change of inductance detected by the detector into change of voltage and a liquid level indicator which is driven by a drive circuit in accordance with such conversion.

Abstract: A transformer utilizing a rotating flux for saturating the entire core. The transformer uses a core configured such that a vector sum of the induction produced by two windings in the core rotates through 360.degree.. This is accomplished by arranging the component induction vectors to be perpendicular and the source voltages associated with each of the component induction vectors to be 90.degree. out of phase. If the inductions are of equal magnitude and the vector sum is sufficient to saturate the core, rotation of the vector sum saturates the entire core and the transformer experiences a very low or nearly negligible hysteresis losses. Various topological configurations for the core, including a toroid, are described. The transformer windings can be arranged for single, two-phase, three-phase, or multi-phase operation.

Abstract: A transformer comprising a core, a primary winding and a secondary winding in which one of the windings, preferably the winding with the least coils, is formed from a tubular member formed in a plurality of coils; in the preferred embodiment of a step down transformer, the secondary winding is formed from a tubular member. A connector block at each end of the secondary winding includes an appropriate fluid passage and means for connecting a fluid coupling to the block so that the inlet and outlet of the fluid circulation system can be secured to the tubular member forming the secondary winding. The loops of the primary coil are interdigitally arranged with the loops of the secondary coil so that the fluid in the secondary coil absorbs heat from both the primary and secondary windings. Each loop of the secondary includes a bow so that adjacent ends of each loop of the primary are sandwiched between the bows.

Abstract: A transformer comprising a core, a primary winding and a secondary winding in which one of the windings, preferably the winding with the least coils, is formed from a tubular member formed in a plurality of coils in the preferred embodiment of a step down transformer, the secondary winding is formed from a tubular member. A connector block at each end of the secondary winding includes an appropriate fluid passage and means for connecting a fluid coupling to the block so that the inlet and outlet of the fluid circulation system can be secured to the tubular member forming the secondary winding. The connector blocks also include threaded apertures adapted to receive the bolt for providing an electrical connection to an electrical apparatus such as a welding gun. The loops of the primary coil are interdigitally arranged with the loops of the secondary coil so that the fluid in the secondary coil absorbs heat from both the primary and secondary windings.

Abstract: An electrosurgical unit including voltage control circuitry which operates to limit the voltage at the electrosurgical electrodes when the unit is not in coagulation mode. The electrosurgical unit includes sensing circuitry for providing a signal representative of the voltage at the electrosurgical electrodes, a mode setting switch or dial for changing between a cut mode setting and a coagulation mode setting, a circuit for producing a mode signal, and an RF power generator responsive to the mode setting switch for providing a cut mode waveform at the electrode outputs when the mode setting switch is in cut mode and a coagulation mode waveform when the mode setting switch is in the coagulation mode setting. A voltage limiting circuit is responsive to the signal from the sensing circuitry and limits the voltage at the outputs when the electrosurgical unit in cut mode. Suppression circuitry responsive to the mode signal prevents the voltage limiting circuitry from operating in coagulation mode.

Abstract: A pulse transformer for use in a switching power supply having primary and secondary windings wound concentrically around a common core and two electrostatic shield foils interposed between the primary and secondary windings with an insulator disposed between the electrostatic shield foils.

Abstract: A three phase core form transformer for use in a three phase dual dynamic stabilizer system that provides reactive power compensation. The transformer has a three legged magnetic core, a plurality of primary windings corresponding to the phases, two auxiliary secondary windings per phase that are wound to provide first and second common bifilar portions, and a plurality of principal secondary windings corresponding to the number of primary windings. The first common bifilar portion, the principal secondary winding, the second common bifilar portion and the primary winding are placed coaxially and radially adjacent, in the recited order, starting from each leg of the magnetic core.The primary windings are connected in delta. The principal secondary windings and auxiliary secondary windings are connected in a forked wye wherein one auxiliary secondary winding of each of the other two phases is electrically connected to the free end of each of the wye connected principal secondary windings.

Abstract: A phase-shift transformer circuit providing advance or retard phase shift at any predetermined phase shift angle. The phase shift angle is determined by the ratio of the main and short windings of the transformer primary. Two links are used to provide advance or retard phase shift. One transformer winding is connected directly to a phase conductor of the three-phase power system. The remaining two transformer windings are connected to the remaining two phase conductors via the links. The links are movable such that in the advance configuration, the phase two conductor is connected to one of the transformer windings and the phase three conductor is connected to the other. In the retard phase-shift configuration, the links are moved so that the connections are reversed.

Abstract: A switched mode power supply transformer, particularly for a television receiver, including a primary winding and a secondary winding with the primary winding and the secondary winding each being subdivided into a plurality of respective partial windings. The partial windings of the primary lie in a first group of chambers and the partial windings of the secondary lie in a second group of chambers of a chamber coil body, and the chambers of both groups are nested or interleaved with one another.

Abstract: A transformer for a welding gun has a reduced resistance and reactance thus drawing less current. The transformer is of substantially reduced weight and may be operated at high duty cycles and in a welding gun performing a large number of welds per hour. The transformer is formed of a hollow coil and coolant is flowed through the coil to directly cool the primary. The secondary is electrically insulated from the primary but physically adjacent the primary so that heat from the secondary is dissipated through the primary to the contact.

Abstract: A coil for a 12-pulse transformer-rectifier apparatus assembled on a three-leg magnetic core comprising a half primary winding sandwiched between two half secondary windings of substantially the same height as the half primary winding. A pair of coils associated with one leg of a three-leg magnetic core in a 12-pulse transformer-rectifier, are oriented in opposition to one another, and have all their terminal conductors extending parallel to one another with transversal connectors in closely-related parallel planes.

Abstract: A power transformer characterized by inner and outer low voltage winding sections and a high voltage winding section disposed therebetween. The low voltage windings are comprised of a plurality of pancake coils, and the high voltage winding are comprised of a plurality of conductor strands spirally wound for a plurality of coil layers. The low and high voltage winding sections are laterally spaced with the low voltage windings disposed in side-by-side positions and adjacent to the high voltage windings. The high voltage windings having a smaller turn height than the low voltage windings and having conductor strands of smaller gauge than the pancake coils of the low voltage windings.

Abstract: An eddy current inspection probe includes a bobbin housing a central ferrite rod. Two coils are wound around one end of the ferrite rod. The coils form two legs of a bridge circuit driven at 1.5 to 2.0 MHz. Defects are located by detecting phase shift in the bridge output.

Abstract: The invention relates to a regulating winding for a transformer in which a plurality of helical current-carrying conductor loops are connected in series with each other, whereas a plurality of non-current-carrying helical potential control loops are provided adjacent to the current-carrying loops and are connected to appropriate ones of the current-carrying loops in such a way that a substantial increase in the series capacity of the regulating winding is obtained with a relatively small increase in the space required for the regulating winding.

Abstract: A circuit arrangement for power transformers utilizes a series and parallel interconnection of low voltage winding layers to control the impedance between the high voltage winding and the low voltage winding. The division of current between the low voltage parallel winding layers is controlled by adjusting the relative turn distribution between two series connected portions of the low voltage winding.

Abstract: A transformer characterized by groups of low voltage and high voltage windings inductively related to a core member, and a shunt of magnetizable microlaminations disposed between the low and high voltage windings, whereby the shunts independently adjust the transformer impedance.

Abstract: A printed circuit transformer comprises one primary track and two secondary tracks, the three tracks being located adjacent and substantially parallel to each other with one side of one of the secondary tracks and the other secondary track being connected to a common source of potential. The primary track is located between the secondary tracks and all the tracks are printed wholly on one side of the circuit board.

Abstract: A transformer includes a magnetic core; an input or primary winding structure wound on a bobbin secured to the magnetic core and including first and second primary winding portions; an output or secondary winding structure wound on the bobbin and including first and second secondary winding portions; and a control or tertiary winding structure wound on the bobbin and including first and second tertiary winding portions with the first tertiary winding portion being comprised of first and second windings connected in series, the primary, secondary and tertiary winding structures being wound on the bobbin in the order of the first primary winding portion, the first winding of the first tertiary winding portion, the first secondary winding portion, the second secondary winding portion, the second winding of the first tertiary winding portion, the second primary winding portion, and the second tertiary winding portion, so as to provide a high degree of magnetic coupling between the first primary and secondary wind

Abstract: A primary coil and N secondary coils of insulated electrically conductive wire are wound side-by-side about a ferrite core. Every T turns, the wire forming the secondary coils is wound over a separator strip forming an array of loops. A pair of spaced parallel conductors, for displacing the separator strip, are inserted in the array of loops and are soldered to the loops. The loop portion in the space between the conductors is removed. The assembly is covered with a layer of insulating material. The windings are repeated in a second or more layers over the first layer until the desired number of primary and secondary turns is formed.

Abstract: An output transformer, especially useful to couple a balanced output stage to an unbalanced load, employs first and second primary winding halves, which have their "center taps" physically offset, and wherein the windings are wound coextensively for some but not all of their length. The secondary winding is wound coextensively with one or the other of the two primary halves, thereby improving the coupling and reducing leakage inductance and also reducing the interlayer volt amperes and thus reducing interlayer capacitance.

Abstract: A circuit arrangement for power transformers utilizes a series and parallel interconnection of low voltage winding layers to control the impedance between the high voltage winding and the low voltage winding. The division of current between the low voltage parallel winding layers is controlled by adjusting the relative turn distribution between two series connected portions of the low voltage winding.

Abstract: The doughnut-type transformer comprises a spirally wound core consisting of several individual annular cores each tightened by rod members. The annular core is surrounded by transformer sections comprising the primary and the secondary windings. Each winding is composed of turns shaped as sectors in the plane of the transformer cross-section, a cooled turn of the secondary winding being placed between the turns of the primary winding in each transformer section. The turns of the windings surround the annular core so that the geometric center of each winding is displaced from the geometric center of the annular core in the cross-sectional plane thereof and the geometric center of the annular core is farther from the transformer axis.

Abstract: An induction coil heating device is provided to proximately heat an aperture mask support pin in a relatively confined space in the corner of a television panel skirt. A primary coil adapted to receive alternating current power is wound about at least one insulating support member. The primary is loosely wound in a central axial area thereof to provide an annular space, and a secondary coil with a spaced away outrigger output loop inductively coupled to the primary is wound around said support member in the space provided by the primary. The output loop is adapted to receive electrical energy for heating the support pin in response to input energy provided via said primary coil. The output loop is spaced away from the primary and sized so as to be readily insertable in the confined space of the corner of the panel skirt.

Abstract: A primary coil and N secondary coils of insulated electrically conductive wire are wound side-by-side about a ferrite core. Every T turns, the wire forming the secondary coils is wound over a separator strip forming an array of loops. A pair of spaced parallel conductors, for displacing the separator strip, are inserted in the array of loops and are soldered to the loops. The loop portion in the space between the conductors is removed. The assembly is covered with a layer of insulating material. The windings are repeated in a second or more layers over the first layer until the desired number of primary and secondary turns is formed.

Abstract: There is disclosed a displacement transducer which comprises a plurality of planar circuit boards, each having a coaxial central aperture. Each of said boards having disposed thereon at least one spiral conductive structure which manifests a predetermined coil. The structure is oriented about the aperture and has a first and second terminal. The boards are positioned in a stacked array with each of said boards separated one from the other and with said central apertures aligned to form a central coaxial cavity. Leads are coupled to the first and second terminals of said boards for connecting certain ones in a primary winding configuration and others in at least two secondary configurations. A magnetic core adapted for insertion into said cavity varies the coupling between the primary and secondary windings according to the depth of insertion of said core within said cavity.

Abstract: Low, middle and high voltage windings are wound on a magnetic core in this order, the high voltage winding having a high voltage line terminal at its center and neutral terminals at both ends. Two middle voltage partial windings are coaxially wound on the outside of the high voltage winding at upper and lower positions separated by a necessary distance for insulation. One end of each of the middle voltage partial windings are connected to the neutral point of the middle voltage winding, and the other ends thereof are each connected to the respective tap windings of two tap changers. Thus, the middle voltage partial windings and the tap changers constitute a parallel circuit in which a circulating current flows thereby to induce magnetic flux in each of the middle voltage partial windings and tap windings. The middle voltage partial windings and tap windings are so wound that the magnetic coupling therebetween through the induced magnetic flux can be reduced.

Abstract: In a transformer of the type having spirally wound copper foil windings, capacitive signal transfer between the primary and secondary windings is avoided by placing the turns of the winding having the smaller number of turns in pairs and placing adjacent each of said turns the turn of the other winding having the same number as the said turn in the sequence of current passage.

Abstract: A transformer providing half-turn windings to permit low voltage output and high current capability. An E-I magnetic core, forming a central leg and two outer legs, provides a magnetic flux path. The central leg is encompassed by a pair of envelopes, wherein each envelope has a center-tap terminal and two output terminals. In each envelope the center-tap terminal is electrically and locationally placed 180.degree. from the output terminals. Each envelope has a longitudinal severance line, each side of which has an extending output terminal leg. A pair of such envelopes will form four half-turn windings which can be connected in aiding phase relationship to provide high current capability at a low voltage, and which reduces the number of turns of primary winding required. The primary winding encircles the central core-leg and the pair of secondary winding envelopes.

Abstract: An autotransformer having the same polarity impedance, series and tertiary windings as defined by an equivalent three-terminal network of said autotransformer. Autotransformers are often protected against phase-to-ground faults by ground fault relays and such devices require this type of impedance relationship for proper operation; especially during phase-to-ground fault conditions.