Abstract: Described herein are systems and methods for generating short load current pulses using an H-bridge. In various embodiments, this is accomplished by controlling, in a shunting mode, a low-side switch of the H-bridge to drive a first average current and controlling, in a non-shunting mode, a high-side switch of the H-bridge to drive a second average current such that the first and second average currents are substantially the same and reduce a current pulse width of the load current.

Abstract: A magnetic device includes a winding, and insulators by which the winding is surrounded. Each of the insulators is in contact with the winding. A gap exists between each two adjacent of the insulators in a winding direction of the winding.

Abstract: Embodiments include systems, methods, and apparatuses for controlling off-time during a burst mode in an LLC converter. In one embodiment, a circuit comprises an LLC converter having a primary side and a burst mode controller, the burst mode controller configured to monitor, on the primary side of the LLC converter, electrical current, and in response to a determination that the electrical current is below a first threshold, increase an off-time for switches in the LLC converter and in response to a determination that the electrical current is above a second threshold that is higher than the first threshold, decrease the off-time for the switches in the LLC converter.

Abstract: A LCL filter for a 1 or 3-phase grid including one magnetic core, at least one primary winding, at least one secondary winding, at least one winding for reducing flux ripples in the magnetic core located between the primary winding and the secondary winding, wherein the windings are placed on the magnetic core, the primary winding is connected to the input of the LCL filter for connecting the filter to an inverter, the secondary winding is connected to the output of the LCL filter for connecting the filter to a load or grid and the winding is connected to the filter capacitor wherein the magnetic core is a closed magnetic core and the windings are galvanically insulated.

Abstract: Method for producing an integrated magnetic device with variable inductance, comprising: a) making of a piezoelectric element on a first substrate; b) making of a first electrically conductive element on a face of the piezoelectric element, and fastening of the ends of the piezoelectric element to a second substrate such that the piezoelectric element is arranged facing a cavity formed between the second substrate and the piezoelectric element, the first electrically conductive element being arranged in and/or against the second substrate or against the piezoelectric element; c) removing of the first substrate; d) making of a second electrically conductive element on another face of the piezoelectric element; and further comprising the making of an electrical and/or magnetic coupling of the first and second electrically conductive elements, and the making of a magnetic element arranged against and/or in the piezoelectric element and between the electrically conductive elements.

Abstract: A variable coupled inductor comprises a first core having a first protrusion, a second protrusion, a third protrusion, a first conducting-wire groove and a second conducting-wire groove on the top surface of the first core, wherein the second protrusion is disposed between the first protrusion and the third protrusion, wherein a first conducting wire is disposed in the first conducting-wire groove, and a second conducting wire is disposed in the second conducting-wire groove, wherein a second core, disposed over the first core, wherein a magnetic structure is integrally formed with the second core and protruded on the bottom surface of the second core, wherein the bottom surface of the magnetic structure is located over the top surface of the second protrusion.

Abstract: A system for guidance of a robot through a passenger cabin of an aircraft on at least a part of a defined system of paths including a robot, having at least one secondary coil, a field of coils including N primary coils being integrated in the floor of the passenger cabin of an aircraft, the arrangement of the primary coils defining a system of paths of the robot, and a control system for positioning of and energy provision to the robot including a command unit for sending instructions to the robot, so that the robot can reach a specific position of the defined system of paths.

Abstract: An improved primary or secondary side pad for a wireless transformer for inductive power transfer through an air gap is provided. The primary or secondary side pad includes a first plate, a second plate, and at least two rods which are linking the first and the second plate, where a winding is wound around each rod. A wireless transformer for inductive power transfer through an air gap includes a primary side pad and a secondary side pad of the transformer which is identical in shape and size.

Abstract: Disclosed herein are an apparatus and a method for controlling PWM switching frequency that employ a negate PWM scheme to thereby increase PWM switching frequency, improve control responsiveness, and reduce the size of the circuit. The apparatus includes: a power factor correction (PFC) converter configured to convert an AC voltage into a DC voltage, the converter comprising a transistor controlling an operation of the PFC converter and a current sensor for measuring an electric current flowing through the transistor; and a controller configured to receive an output from the current sensor and calculate a duty ratio of a switching signal applied to a gate terminal of the transistor. The controller applies the calculated duty ratio to the switching signal in an on-duty period of the switching signal.

Abstract: Certain aspects of the present disclosure provide techniques and apparatus employing an isolation ring having a center strip of conductive material used to isolate magnetic fields generated by common-mode and differential-mode current flow through one or more inductors disposed in the ring. The apparatus generally includes an electrical component having an inductive element and a ring of electrically conductive material encircling the inductive element, wherein the ring has a strip of electrically conductive material disposed in the ring and connecting a first point on the ring to a second point on the ring.

Abstract: Provided are a plasma generating apparatus using mutual inductive coupling and a substrate treating apparatus including the same. According to an embodiment of the present invention, a plasma generating apparatus includes: an RF power supply providing an RF signal; a plurality of electromagnetic field applying units inducing an electromagnetic field by receiving the RF signal; and a reactance element connected to a ground terminal of the electromagnetic field applying unit, wherein each of the electromagnetic field applying units may include a plurality of mutually-inductively coupled coils.

Abstract: The present disclosure relates to filters. Teachings thereof may be embodied in a filter assembly, e.g., a filter assembly for filtering output currents from a voltage converter. For example, a filter assembly may include: a current conductor with a curved profile; a first ferrite body; a second ferrite body; and a recess with a curved profile defined in at least one of the first ferrite body and the second ferrite body. The first ferrite body and the second ferrite body may combine to surround the current conductor and the current conductor may extend along the recess.

Abstract: A basic electromagnetic component includes an electromagnetic circuit, which is composed of magnetic core and of coil and of one or more optional parts; of permanent magnet and/or of control unit. In the electromagnetic power unit motors, generators or linear motors implemented with basic electromagnetic components are connectable for different current and voltage values by changing the connections of electromagnetic components. An electronic switching module includes internal electronic or electromechanical switches and/or inverters which is composed of control unit to switch and invert polarities of sections of phase coils of an electric motor or generator during its operation and of at least two phase coil sets connected in series or parallel, or in combinations of these, and switching connections between phase coils or phase coil sets in series or in parallel to adjust power and speed in steps by using electric gears.

Abstract: Accurate measurements of electrical power at various points of a power grid is becoming more important and, at the same time, is getting more difficult as the old power distribution model of a few, large power generating stations and a multitude of relatively linear loads is replaced by a newer model containing a multitude of smaller, and to some degree unpredictable power sources, as well as a multitude of not always linear and often smart (essentially also unpredictable) loads. Embodiments of the invention provide for management of AC current measurements in the presence of a DC current. Such current measurement management including at least alarms, feedback, and forward correction techniques exploiting magnetic field measurements from within the magnetic core or upon the surface of magnetic elements and/or shields within the current transducer.

Abstract: A switched-capacitor circuit has two capacitors and two MOSFETs that cross-couple the capacitors, connecting the anode of one to the cathode of the other, and vice-versa. When either MOSFET is on, the capacitors are in series; the order alternates as the MOSFETs alternate. A reversing cyclical voltage suitable as a primary drive for a transformer is generated. If the MOSFETs alternate with no dead-time, a square-wave excitation is generated. With off-time, a pwm excitation is generate. Charge is maintained on the switched-capacitors using a symmetrical common-mode inductor. A bifilar winding is center-tap as its input, and the ends of the bifilar winding are connected to the capacitors. The capacitors are effectively in parallel. Because the charging current flows and returns through each leg of the inductor equally, it cannot magnetize the inductor core or cause any flux change. Because any voltages induced in the windings are common-mode, flux change in the core does not affect the charging current.

Abstract: An inductor configured to be mounted on a printed circuit board is provided. The inductor includes a drum core including a cylindrical body and first and second flanges extending from opposite ends of the cylindrical body, a coil wound around the cylindrical body, a plurality of pins on which opposite ends of the coil are wound, wherein each of the plurality of pins has one end fixed to the second flange and another end configured to be fixed to the printed circuit board, and at least one projection which protrudes from the second flange and is configured to support the inductor to stand vertically on the printed circuit board.

Abstract: A system includes a power converter configured to convert input power into output power. The power converter includes first and second converter bridges, where each converter bridge includes multiple transistors. The system also includes a zero-voltage switching (ZVS) assistance circuit having first and second inverse controlled rectifiers (ICRs). Each of the first and second ICRs is configured to provide current to the transistors in the first and second converter bridges. The system further includes a controller configured to control operation of the first and second converter bridges and the ZVS assistance circuit. The controller could include a phase-shift modulation (PSM) controller configured to control the converter bridges and a pulse width modulation (PWM) controller configured to control the ZVS assistance circuit.

Abstract: A load driving device includes a power storage device, a first power converter, a ring-shaped filter, a first output-side power line, and a first input-side power line. The first output-side power line extends through an opening so that a first output-side common mode current caused by switching the first switching element flows inside the opening through the first output-side power line in a first output-side flow direction. The first input-side power line extends through the opening so that a first input-side common mode current caused by switching the first switching element flows inside the opening through the first input-side power line in a first input-side flow direction same as the first output-side flow direction.

Abstract: To greatly improve the productivity, the general versatility, the downsizing, the performance and the like, as compared to those of the conventional transformer, provided is a transformer including: a core; a primary winding; a secondary winding; a bobbin provided with a low voltage side coil winding portion and a high voltage side coil winding portion, wherein the secondary winding is wound onto each of the coil winding portions; and a casing disposed so as to cover an outer periphery of the bobbin, wherein the primary winding is wound onto a portion of an outer periphery of the casing corresponding to a position of the low voltage side coil winding portion.

Abstract: A support frame for an electrical transformer assembly, comprising two loop-shaped parts, each loop-shaped part having a plurality of limbs, each limb having a peripheral recessed portion in which a primary electrical coil is mountable, and at least one secondary coil is mountable in piggyback on the primary electrical coil, one limb of each loop-shaped part having a straight section. The frame also includes an adjustable attaching means for attaching one of the loop-shaped parts with respect to the other loop-shaped part and adjusting a distance therebetween, so that only the straight sections are adjacent and form a central leg, the central leg being for receiving a magnetic core distinct from the attaching means. The frame provides a means and a method to efficiently secure adjacent windings in a circular core transformer kernel.

Abstract: The present invention provides a heating unit capable of easily and inexpensively adjusting total impedance based on tire mold size so that a power source can be used at a high power factor, and a tire heating apparatus using the same. A ferromagnetic metallic member 10a heats a tire mold M1 by heat conduction. An induction heating coil C1 is disposed on the side of the ferromagnetic metallic member 10a opposite the tire mold M1 to induction-heat the ferromagnetic metallic member 10a by generating magnetic field lines. A nonmagnetic conductor 30a is disposed on the side of the induction heating coil C1 opposite the ferromagnetic metallic member 10a to shield the magnetic field lines generated by the induction heating coil C1. A heating unit 100a including these elements heats the tire mold M1 storing a tire.

Abstract: The invention relates to a power transformer with electronic components. The aim of the invention is to arrange the energy supply of the electronic components of a power transformer closer to the components and thus eliminate the disadvantages of the prior art. According to the invention, a stray field collector is brought into a stray field of the power transformer, whereby a voltage is generated.

Abstract: An inductor includes a core that has a window (164). The core includes a first core member and a second core member. A first winding is coupled to the first core member and a second winding is coupled to the second core member. A shell surrounds the core. Pairs of gaps between the core and the shell provide flux paths.

Abstract: In order to additionally furnish the transformer with the reactor capability easily without having to change the structure of the transformer, a transformer is formed by winding an input-side coil 1b and output-side coils 1a and 1c around a shell-type iron core 2 so that voltages are induced in the output-side coils 1a and 1c by magnetic fluxes generated by a voltage applied on the input-side coil 1b, and two reactor coils 3a and 3b having the same winding number in the opposite winding directions and making a pair are wound around the shell-type iron core 2. A shared reactor transformer as a whole is thus formed.

Abstract: 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 first and second inductors; and an impedance is connected in series with the third inductor, wherein the circuit generates a third ripple current opposing the combination of the first and second ripple currents generated by the first and second inductors.

Abstract: A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc1, in which a primary winding 5a of a transformer T, a reactor L3 and a first switch Q1 are connected in series; a second series circuit, connected to both terminals of the primary winding 5a and the reactor L3, which includes a switch Q2 and a capacitor C3; a smoothing circuit D1, D2, L1, C4; and a control circuit 10 alternately turning on and turning off the switches Q1, Q2. The transformer T includes: a main core 21, formed with a magnetic circuit, on which the primary and secondary windings 5a, 5b are wound with a given gap 23; and a plurality of auxiliary cores 24a, 24b disposed in the given gap 23 with a given distance in a circumferential direction of the primary winding 5a. Further, the reactor L3 is formed of a leakage inductance of the transformer T.

Abstract: An inductor (160) includes a core (162) that has a window (164). The core (162) includes a first core member (168) and a second core member (170). A first winding (176) is coupled to the first core member (168) and a second winding (178) is coupled to the second core member (170). A cross-member (172, 174) is coupled at least partially across the window (178) and is conductively enabling flux flow between the first core member (168) and the second core member (170). An electronic circuit (100) includes an input terminal (118), an inductor (102), and an output terminal (E?, F?). The inductor (102) is coupled to the input terminal and has only a single inductive core (162). The inductor (102) is coupled to filter both common-mode noise and differential-mode noise. The load terminal is coupled to and receives filtered common-mode and differential-mode current from the inductor (102).

Abstract: Methods and apparatus that employ a coil-less magnetoelectric flux switch arrangement to repeatedly switch magnetic flux from at least one permanent magnet for the purposes of generating motive force and/or electrical energy.

Abstract: Prior art electromagnetic coil technology in tattoo machines employs a round steel post to alternately repel and attract an armature bar retained by a spring, reciprocally moving a needle bar and attached needle groupings into and out of the skin in the act of tattooing. The present invention uses a hexahedron shaped steel post to increase the surface area contacted on the armature bar, improving the magnetism and general movement of the bar. The improved rate of movement of the armature improves the overall functioning of the tattoo machine including the operator's ability to achieve more solid color, smoother shading, and more consistent lines. Removable retaining washers and o-rings are employed to allow the operator to customize and repair the magnetic wire.

Abstract: Methods and apparatus that employ a coil-less magnetoelectric flux switch arrangement to repeatedly switch magnetic flux from at least one permanent magnet for the purposes of generating motive force and/or electrical energy.

Abstract: A method and apparatus for transformer bandwidth enhancement is disclosed. In one embodiment, a transformer is provided for use in a high frequency communication environment. In one configuration, the transformer is configured with one or more compensation networks to improve high frequency operation and to reduce insertion loss at all frequencies. The compensation networks may be designed, in combination with a transformer, to create an equivalent all-pass symmetric lattice network having a frequency response in the desired range. In one embodiment, the compensation networks comprise a capacitance creating device which, when cross-connected to the transformer, increases transformer bandwidth.

Abstract: A cross current control system for multiple, parallel-coupled power converters includes common mode chokes, local cross current feedback controllers, and local converter controllers. Each common mode choke is coupled to a respective power converter. Each local cross current feedback controller is configured for receiving common mode cross currents from a respective local cross current detector, calculating a resultant cross current, and generating a local feedback control signal. Each local converter controller is configured for using a respective local feedback control signal to drive the respective power converter in accordance with a coordinated switching pattern. An integral choke assembly includes a common mode choke and a differential mode choke with common and differential mode choke cores configured with at least one magnetic flux path being shared by magnetic flux generated by common mode coils and differential mode coils.

Abstract: A flyback transformer is mounted on a main wiring board formed with a power circuit. A mounting bracket shaped like an L-character in plan view is integrally molded on a chassis. A mounting portion disposed at the top of the flyback transformer is fixed by screws to an upper end of the mounting bracket. A boss in a height middle portion of the mounting bracket is fitted into a cabinet.

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 transformer includes a ferrite base plate having a chamber for receiving a winding and one or more further windings which may be coupled to a ground. The windings are electrically coupled together, and separated from each other by partitions. An insulating strap may be wound around the ferrite base plate, and engaged with the ground, for securing the ground to the ferrite base plate and for preventing the ground to the ferrite base plate from moving relative to the ferrite base plate. One or more conductive panels may be engaged between the partitions of the windings.

Abstract: A tuned filter for connection to a busbar in a high voltage electric power system. The filter incorporates a variable inductor comprising a main winding, auxiliary windings and switching circuitry associated with each auxiliary winding. The auxiliary windings are arranged to act in inductive series with respect to the main winding, and the switching circuitry is used to selectively connect the auxiliary windings in electrical series with the main winding, so allowing the inductance of the inductor to be varied. To achieve enhanced variability of the inductance, each auxiliary winding has a number of turns substantially equal to x2(n−1), where n is a positive integer corresponding to the position of each auxiliary winding in the inductive series of auxiliary windings and x is also a positive integer.

Abstract: A tuned filter for connection to a busbar in a high voltage electric power system. The filter incorporates a variable inductor comprising a main winding, auxiliary windings and switching circuitry associated with each auxiliary winding. The auxiliary windings are arranged to act in inductive series with respect to the main winding, and the switching circuitry is used to selectively connect the auxiliary windings in electrical series with the main winding, so allowing the inductance of the inductor to be varied. To achieve enhanced variability of the inductance, each auxiliary winding has a number of turns substantially equal to x2(n−1) where n is a positive integer corresponding to the position of each auxiliary winding in the inductive series of auxiliary windings and x is also a positive integer.

Abstract: Methods and apparatus are disclosed for suppressing or eliminating nonlinear current drawing characteristics, while at the same time substantially eliminating high order current harmonics. In accordance with various aspects of the present invention, an energy transfer system, for example a pulse width modulator (PWM) flyback converter (22), comprises an inductor (L) interposed between the AC line voltage and the load (Rload), with a controllable switch (26) provided between the inductor (L) and the negative supply leg of a rectifier circuit (10). The duty cycle of the converter switch (26) is suitably controlled to produce a substantially constant DC output from the converter (22). Proper synchronization of the converter switch (26) ensures that the current through the inductor (L) and the output current through the load (Rload) remains in phase with the AC supply voltage. Thus, a power factor on the order of unity is maintained while substantially eliminating nonlinear current drawing characteristics.

Abstract: A flux-controlled variable transformer can control voltage at a high speed without using any voltage adjusting tap. The transformer has a first and second magnetic circuits. The first magnetic circuit is composed of a first and second U-cut cores (13 and 11) which contact at their cut ends with each other in the state either of the two cores has been turned by 90.degree. in a twisting direction relative to the other. The primary winding (14) is wound in common around the second magnetic circuit and the first U-cut core (13) of the first magnetic circuit, the secondary winding (17) is wound around the second magnetic circuit and a control winding (12) is wound on the second U-cut core (11) of the first magnetic circuit. The magnetic flux linking the primary and secondary windings (14 and 17) can be controlled by change of the magnetic resistance in the first magnetic circuit with the primary winding (14) by changing a value of exciting current flowing in the control winding (12).

Abstract: Each torque-producing phase current of a multi-phase motor is passed through a filter which includes an R/C shunt to ground and a series, current-compensated choke. Each choke has a winding in series with each phase so that the net current generated by phase currents in the windings is zero, and therefore the net flux generated by phase currents in the highly permeable core of the choke is zero at all times. However, there is significant inductive reactance created by the non-counterbalanced motor leakage currents, which prevent leakage currents from circulating through the motor. Thus, torque-producing motor currents can accurately be measured for feedback, without pollution from leakage currents. LEM current transducers allow use of small, proportional currents in the measuring and suppress inter-phase coupling.

Abstract: There is provided a choke coil having a sufficient noise eliminating effect against common mode and normal mode noises. The choke coil has two bobbins, a pair of windings wound around the respective bobbins, first and second magnetic cores which are each inserted in cylindrical body portions of the bobbins at one side thereof, and a support member for supporting the cores. The first magnetic core is in the form of the character B and made of a material having lower permeability. The second magnetic core is in the form of the character D and made of a material having higher permeability. A predetermined gap is maintained between the cores by a spacer provided on the top surface of the support member.

Abstract: Embodiments of the invention include a transformer device having a saturation region for limiting ingress noise and other noise. The transformer comprises a magnetic core, an input coil and an output coil arranged so that the output signal caused by the magnetic linkage between the input and output coils through the magnetic core is based on the magnitude of the input signal. According to an embodiment of the invention, the magnetic core includes a saturation region that limits the output signal regardless of the magnitude of the input signal once the saturation region reaches its saturation magnetization state. The saturation region comprises a reduced saturation magnetization level caused by a geometrically constricted region of the magnetic core or, alternatively, by a modified, magnetic-equivalent region having properties similar to a geometrically constricted region.

Abstract: A static magnet dynamo including at least one permanent magnet having different poles; a first core comprising a soft magnetic material and which couples the different poles of the permanent magnet to form a closed magnetic path therein; a second core comprising a soft magnetic material which couples to the closed magnetic path via a paramagnetic material to form an open magnetic path; a magnetized coil wound around a portion of the first core where the closed magnetic path is formed; and an induction coil wound around a portion of the second core. A direction of a flux of the closed magnetic path is changed by applying an alternating voltage to the magnetized coil, generating an electromotive force in the induction coil by electromagnetic induction due changes in a flux of the open magnetic path induced by the change in direction of the flux of the closed magnetic path.

Abstract: A multi-cathode electron beam plasma etcher is disclosed. The multi-cathode electron beam plasma etcher is comprised of: a vacuum chamber; several cathodes which are installed in the upper end of the upper part of the chamber and generates an electron beam in order to generate plasma in a large area; an acceleration electrode and a deceleration electrode which, form an acceleration and a deceleration tube structure in order to withdraw much of the electron beam, are arranged sequentially from the front of the cathode, and form an electrostatic lens when the differential voltage is applied respectively; first vacuum evacuation device to made the upper part of the chamber vacuum; an etching gas injection device which is installed in the side wall around the upper end of the lower part of the chamber; second vacuum evacuation device which is installed in the lower part of the chamber; and a holder of the etched body which is installed in the lower part of the chamber.

Abstract: An apparatus for providing an electrically controllable inductor which uses a first and a second magnetic core (20, 24) spaced apart from one another. A DC bias coil (22) is wound on the first magnetic core (20). An inductor coil (26) is wound on both the first magnetic core (20) and the second magnetic core (24). The inductance seen at terminal connections (80, 82) of the inductor coil (26) is variable in dependence upon a magnitude of a flow of direct current through the DC bias coil (22). In one embodiment of the inductor, the first and the second magnetic core (20, 24) are each formed using a pair of U-shaped core segments (30, 32, 60, 62) located adjacent to one another. In this embodiment, the first and second magnetic core (20, 24) are located in an opposing relation to one another, with the DC bias coil (22) wound on inner legs (64, 72) of the first magnetic core (20) and the inductor coil (26) wound on inner legs (64, 72, 34, 44) of both the first and the second magnetic core (20, 24).

Abstract: Two coils 3a, 3b are wound over adjacent portions of a first magnetic core having two closed magnetic circuits and a second magnetic core. The winding directions of the two coils are set so that the magnetomotive forces generated by both coils may cancel each other in the second magnetic core. The magnetic fluxes flowing in the first magnetic core decrease the higher harmonics of an input current of the power source circuit, while the magnetic fluxes flowing in the second magnetic core 2 decrease the noise between the line and the ground. That is, the choke coil performs the function of choke coil and the function of noise filter at the same time.

Abstract: An apparatus for providing an electrically controllable inductor uses a first and a second magnetic core (20, 24) spaced apart from one another. A DC bias coil (22) is wound on the first magnetic core (20). An inductor coil (26) is wound on both the first magnetic core (20) and the second magnetic core (24). The inductance seen at terminal connections (80, 82) of the inductor coil (26) is variable in dependence upon a magnitude of a flow of direct current through the DC bias coil (22). In one embodiment of the inductor, the first and the second magnetic core (20, 24) are each formed using a pair of U-shaped core segments (30, 32, 60, 62) located adjacent to one another. In this embodiment, the first and second magnetic core (20, 24) are located in an opposing relation to one another, with the DC bias coil (22) wound on inner legs (64, 72) of the first magnetic core (20) and the inductor coil (26) wound on inner legs (64, 72, 34, 44) of both the first and the second magnetic core (20, 24).

Abstract: A transformer in which the primary coil and the secondary coil are insulated from the iron laminations which form part of its flux paths by insulated covers which snap-on to the primary and secondary coils.

Abstract: Here is disclosed a compact transformer comprising a plurality of core elements so combined to form a complete core defining two closed magnetic circuits, one of these magnetic circuits being provided with primary and secondary windings of a first coil and the other magnetic circuit being provided with primary and secondary windings of a second coil so that inductive portions of these first and second coils are simultaneously activated.

Abstract: A transformer having a shunt magnetic path and a shunt coil is provided. The transformer includes control circuitry to control the output of the transformer by controlling current flow in the shunt coil, thereby controlling the flux through the shunt magnetic path and the flux coupling with the secondary coil. The current in the shunt coil is phase-controlled and power for the control circuitry is derived from the current induced in the shunt coil.