Abstract: An inductive device includes an inductor having an inductance associated therewith, and a tuning ring disposed around the inductor. The tuning ring has an inductance associated therewith, wherein the tuning ring is coupled to the inductor to establish a mutual inductance between the tuning ring and the inductor. The inductance of the inductor, the inductance of the tuning ring, and the mutual inductance between the tuning ring and the inductor contribute to a total inductance of the inductive device. The tuning ring is configurable, and is selectively configured to achieve a certain value for the mutual inductance, and a certain value for the inductance of the tuning ring, without changing a footprint of the tuning ring.

Abstract: The invention proposes an induction component produced using thin film technology which can be used for a variety of functions. It contains, on a magnet core with a ring shape, two coil devices which, for their Part, are in turn constructed from at least two coils. The adjacent end windings of adjacent coils are connected to one another and to a common solder pad within each coil device. This makes it possible to connect individual coils and thus to utilize different functions of the induction component.

Abstract: The present application relates to circuitry having a plurality of inductors, each inductor having a first end and a second end; and a switching arrangement connected to the first end and to the second end of each of the plurality of inductors for routing a current via the inductors; wherein the switching arrangement is arranged to at least one of selectably prevent current from flowing through a subset of the plurality of inductors and select a current flow direction through one of the inductors relative to a current flow direction through at least one other of the inductors so as to vary an effective inductance that the plurality of inductors represents to the current.

Abstract: Systems, methods and devices directed to transformers are disclosed. One transformer system includes a set of transformer cells and a controller. The set of transformer cells is coupled in series to form a series coupling, where each transformer cell includes at least one first coil and at least one second coil. The second coil is configured to receive electrical energy from the first coil through magnetic interaction. The controller is configured to modify electrical aspects at ends of the series coupling by independently driving the transformer cells such that at least one of the transformer cells is driven differently from at least one other transformer cell in the set.

Abstract: A resonant array for the transmission of multiple frequency wireless energy in multiple configurations at a useful distance for grid-coordinate power and information delivery on small aperture and mobile scales where alternatives such as battery, solar, infrared, microwave, or other power-independent means are inappropriate or inaccessible.

Abstract: Provided herein is a variable inductor, comprising a substrate having a surface layer and an inner layer, a plurality of fixed inductors disposed on the substrate, a signal microstrip line serially connecting the fixed inductors to form a serial fixed inductor, a conductive sheet, a signal input terminal, and a signal output terminal, wherein one end of the serial fixed inductor is connected to the signal input terminal, the other end of the serial fixed inductor is connected to the signal output terminal, and the conductive sheet is for controlling the fixed inductors. The variable inductor of this invention is useful in applications where a given number of inductance values are required, so as to efficiently adjust and obtain the required inductance values.

Abstract: A communication interface employing a differential circuit and method of use is disclosed. In one form, a circuit operable to communicate signals via a communication bus can include a differential signaling circuit operable to be coupled to a communication bus. The differential signaling circuit can include a first current carrying element and a second current carrying element. The circuit can also include a shunt circuit including a first transformer. The first transformer can include a primary transformer element and a secondary transformer element. The first transformer can be operably associated with the communication bus.

Abstract: A transformer 10 has a first core CR1, a second core CR2, a first transformer primary winding W1, a coil 45, a coil 46 and a coil 47. The second core CR2 is integrally formed with the first core CR1. The first transformer primary winding W1 is wound onto the first core CR1. The coil 45 is wound onto the first core CR1 and forms a transformer T1 together with the first transformer primary winding W1. The coil 46 is wound around the first core CR1 and forms a transformer T2 together with the first transformer primary winding W1. The coil 47 is connected to the coil 45 and coil 46 and forms an output coil using the second core CR2 as a magnetic core.

Abstract: A meander inductor is disclosed, the inductor is disposed on a substrate or embedded therein. The meander inductor includes a conductive layer composed of a plurality of sinusoidal coils with different amplitudes and in series connection to each other, wherein the sinusoidal coils with different amplitudes are laid out according to a periphery outline. The profile of the meander inductor is designed according to an outer frame range available for accommodating the meander inductor and is formed by coils with different amplitudes. Therefore, under a same area condition, the present invention enables the Q factor and the resonant frequency fr of the novel inductor to be advanced, and further expands the applicable range of the inductor.

Abstract: Disclosed is an integrated tunable inductor having mutual micromachined inductances fabricated in close proximity to a tunable inductor that is switched in and out by micromechanical ohmic switches to change the inductance of the integrated tunable inductor. To achieve a large tuning range and high quality factor, silver is preferably used as the structural material to co-fabricate the inductors and micromachined switches, and silicon is selectively removed from the backside of the substrate. Using this method, exemplary tuning of 47% at 6 GHz is achievable for a 1.1 nH silver inductor fabricated on a low-loss polymer membrane. The effect of the quality factor on the tuning characteristic of the integrated inductor is evaluated by comparing the measured result of substantially identical inductors fabricated on various substrates. To maintain the quality factor of the silver inductor, the device may be encapsulated using a low-cost wafer-level polymer packaging technique.

Abstract: A dual coil induction cooking system and method for heating ferrous and non-ferrous cooking vessels. The system includes a first resonant circuit for inducing a current in a ferrous metal cooking vessel at a first frequency and a second resonant circuit, wired in a parallel combination with the first resonant circuit, for inducing a current in a non-ferrous metal cooking vessel at a second frequency. The system also includes a power source for powering the parallel combination, so that one of the first and the second resonant circuits is coupled to supply power through the parallel combination to a respective one of the cooking vessels. A method for coupling power to a load includes sweeping a parallel combination of resonant circuits with a variable frequency power, detecting a resonant frequency response corresponding to a metallic composition of the load, and simultaneously powering the parallel combination of resonant circuits at a frequency corresponding to the detected resonant frequency.

Abstract: Disclosed is a method for adjusting the inductance of an inductor at least including a bobbin, a first magnetic member having a concavity on a side wall thereof, and a second magnetic member having a protrusion at a first end thereof for preventing the second magnetic member from being completely inserted into the bobbin so as to form a gap between the first and second magnetic members. The method includes the steps of selecting a reference piece with a suitable thickness to be disposed between the protrusion of the second magnetic member and the side wall of the first magnetic member with the concavity and closely attached to both of them t as said second magnetic member is inserted into said bobbin, and partially removing the second magnetic member from a second end thereof according to the thickness of the reference piece so as to obtain a predetermined inductance value.

Abstract: A circuit arrangement for large power transformers with a low-voltage winding, a main high-voltage winding and a step winding as well as a step switching device at a Y-point side thereof, includes, at a location between a point connecting the step winding to the high-voltage main winding and the Y-point of the transformer, a capacitor in series with a resistor is connected electrically parallel to respectively current-carrying steps of the step winding, the capacitor and the resistor being of such dimensions as to decrease resonance amplitudes of the connecting point to ground, the capacitor being constructed of spirally wound strip lines formed of a resistance alloy, the strip lines being also of such dimensions as to reduce resonance amplitudes of the connecting points.

Abstract: An on-load tap-changing transformer in which its high-voltage winding is axially divided into parallel-connected halves, and an end conductor constituting part of the high-voltage winding is connected to the other terminal of each of the halves. A coarse tap coil connected by the end conductor to the other terminal of each of the halves of the high-voltage winding is disposed adjacent to the associated half, and a fine tap coil connected to the coarse tap coil through a coarse tap selector used for the change-over of the tap position to the taps of the coarse tap coil is disposed at a radial position spaced apart from the coarse tap coil. The end conductor is wound together with the conductors of the fine tap coil.

Abstract: A plastic injection molding system having a temperature controlled electric heater element.The heater element is formed by disposing a pair of heater wires and a pair of thermocouple wires and a powdered mineral material in a metal sheath which is subjected to repeated drawing and annealing operations and is then cut to a desired length after which at one end, the heater wires are welded together and the thermocouple wires are welded to the sheath and the sheath is welded to form a closed end wall. At the opposite end, the heater and thermocouple wires are connected through connection means and connection wires to a current supply and a temperature sensing circuit. The sheath is in the form of a rightly wound helical coil structure and is installed in direct heat transfer engagement on a cylindrical surface of a metal part which has an axially extending plastic flow passage therein.

Abstract: A dual-voltage electric plug comprising an insulating hollow casing having an opening, a terminal fitting within the casing, said fitting including four conducting terminal pins extending towards the opening in the casing, which four terminal pins are respectively connected or connectable to four conductors constituting two pairs across which are respectively connected two primary windings of a transformer having a common secondary winding, and an insulating insert insertable into the opening in the casing in either one of two differing orientations, said insert carrying live and neutral projecting socket pins for cooperation with a mains voltage socket, said insert also carrying connecting means located within the casing when the insert is in its inserted condition and for completing differing circuit paths through the socket pins and the terminal pins in the two respective orientations of the inserted insert, whereby in one orientation the two primary windings will be connected in series to provide a predet