54results about "Continuously variable inductances/transformers" patented technology

The utility model discloses an inductance-adjustable differential and common mode integrated inductor and an EMI filter, and belongs to the technical field of differential and common mode integrated inductors. An inductance-adjustable differential and common mode integrated inductor comprises a closed magnetic core and two groups of coil windings which are symmetrically wound on the closed magnetic core, and further comprises two groups of symmetrically distributed magnetic sheets which are arranged in the closed magnetic core in a sliding mode, and the two groups of coil windings are symmetrical about the middle surface of the two groups of magnetic sheets. An adjusting part used for driving the magnetic sheets to slide is arranged in the closed magnetic core, and during use, the two sets of magnetic sheets are far away from each other or close to each other along the axis of the closed magnetic core; the magnetic sheets can be ejected to the two sides by tightening the screws, so that the opposite area and the up-down gap of the upper magnetic sheet and the lower magnetic sheet are adjusted, the magnetic resistance of the magnetic sheets and the magnetic resistance of air are adjusted, the magnetic resistance of a middle magnetic circuit is adjusted, the effect of adjusting the sensing value is achieved, and the structure is simple.

A method of controlling the magnetic saturation of the core of a DC common mode choke comprising a magnetic core 1 and first and second coils 2, 3, comprises: determining the saturation percentage of

The present invention relates to an electromagnetic induction device having a variable air gap equipped with a heat sink. Specifically, the device according to the present invention comprises a core in which the variable air gap is housed. The air gap further comprises a first ferromagnetic plate, intended to guide magnetic flux, which may originate from the core and may collectively have a saturation magnetic field that is less than the saturation magnetic field of the core. The variable air gap according to the present invention further comprises lateral protrusions extending from lateral surfaces of the first plate, forming the heat sink.

The invention relates to a coil apparatus for an inductive receiving apparatus, including a first coil with a plurality of first turns and a second coil with a plurality of second turns, wherein the first and the second coils are connected to one another in series and are wound in opposite directions relative to each other, wherein each turn includes an internally arranged conductor section and an externally arranged conductor section. With the objective of improving the interoperability of the coil apparatus, a portion of the first and second turns include respectively the internally and externally conductor section arranged such that the first and second turns respectively lie in one plane or span one plane, wherein these planes diverge with respect to one another in the direction from the first coil to the second coil or vice versa, depending on whether the conductor sections are in the portion of the first turns or of the second turns.

The utility model discloses a miniature chip inductor, which relates to the technical field of inductors and comprises a shell, a winding groove is arranged in the shell, a chip coil is spirally wound on the inner side wall of the winding groove, a pin for electric connection is arranged at the end part of the chip coil, a sleeve is rotatably connected in the shell, a magnetic core is movably connected on the inner side of the sleeve, and the magnetic core is arranged in the shell. The magnetic core is positioned in a magnetic core cavity of the sheet type lead coil; the polyester insulating coating coated on the surface of the chip-type wire coil can effectively prevent short circuit and electric leakage and improve safety and reliability of the inductor, ferrite materials are used as the magnetic core, magnetic conductivity of the inductor can be improved, high-frequency loss can be reduced, inductance can be adjusted by adjusting the position of the magnetic core, the application range is wide, and cost is low. The inductor is simple in structure and convenient to use, a user can adjust the inductance value according to actual requirements, the applicability of a product is enhanced, and the inductor shows excellent performance and flexible applicability in various applications through the design.

An optically controlled, multi-transmitter magnetic resonance imaging system for multi-nuclear, high field applications is disclosed. In one embodiment, the MRI system may include a dual-tuned radio-frequency (RF), on-coil power amplifier for amplifying RF power signals at two or more frequencies for the multi-nuclear excitations for use in a dual-tuned coil MRI device or a nested coil MRI device. In one particular implementation, the dual-tuned amplifier of the MRI system may receive optical carrier signals through the broadband optical interface to control the on-coil amplifiers. A variable effective inductor circuit for use in tuning the dual-tuned amplifier is also disclosed. The variable effective inductor circuit includes a gallium nitride (eGaN) field effect transistor (FET) device connected to an inductor. The inductance of the variable effective inductor circuit can be adjusted by modulating a drain-source voltage of the eGaN FET device controlled based on a pulse duration of an optical carrier signal.

An optically controlled, multi-transmitter magnetic resonance imaging system for multi-nuclear, high field applications is disclosed. In one embodiment, the MRI system may include a dual-tuned radio-frequency (RF), on-coil power amplifier for amplifying RF power signals at two or more frequencies for the multi-nuclear excitations for use in a dual-tuned coil MRI device or a nested coil MRI device. In one particular implementation, the dual-tuned amplifier of the MRI system may receive optical carrier signals through the broadband optical interface to control the on-coil amplifiers. A variable effective inductor circuit for use in tuning the dual-tuned amplifier is also disclosed. The variable effective inductor circuit includes a gallium nitride (eGaN) field effect transistor (FET) device connected to an inductor. The inductance of the variable effective inductor circuit can be adjusted by modulating a drain-source voltage of the eGaN FET device controlled based on a pulse duration of an optical carrier signal.

An inductive wireless power transfer and communication system includes an electrostatic shield for one of the coils. The electrostatic shield is inductively coupled with the coil and is configured as an open circuit. A signal processing element or elements, especially a modulator or a demodulator, are connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the modulator or demodulator can operate on the signal on the coil. An electronically controlled variable inductor is connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the variable inductor can tune the impedance of the system.

A multi-core segment variable inductor with different core materials, and a control circuit and a control method thereof. The variable inductor includes a center magnetic segment c, wherein a winding on the center magnetic segment c serves as an inductive winding, and a number of turns of the center magnetic segment is Nac; and peripheral magnetic segments, wherein a number of the peripheral magnetic segments is n; the peripheral magnetic segments are labeled as p1, p2, p3, . . . , to pn; a winding on each peripheral magnetic segment serves as a control winding, and the control windings on the peripheral magnetic segments are configured to independently operate; a number of turns of the control winding of each peripheral magnetic segment is correspondingly Ndc_p1, Ndc_p2, Ndc_p3, . . . , Ndc_pn; wherein an air gap exists between each peripheral magnetic segment and the center magnetic segment, and a length of the air gap is lg.

The invention discloses a high-frequency power inductance device with a self-adaptive heat dissipation function, which comprises a protective frame, an overhead cover plate is arranged at the upper end of the protective frame, mounting grooves are formed in the inner sides of the protective frame and the overhead cover plate, a placement plate is movably connected between the protective frame and the overhead cover plate, and the placement plate is movably connected with the protective frame and the overhead cover plate. The number of the placing plates is two, and the two placing plates are symmetrically distributed. The middle shaft rod drives the rotating bevel gear, the multiple sets of linkage bevel gears and the threaded rod to rotate synchronously, so that the position of the movable frame is changed according to rotation of the threaded rod, and in the moving process, the different spacing distances of the two guide plates are accurately controlled and adjusted; according to the inductance device, the winding mode and direction of the wire on the outer side of the guide plate can be flexibly operated according to actual requirements, meanwhile, the limiting inclined faces effectively prevent the wire from being dislocated and falling off, the applicability and flexibility of the inductance device are greatly improved, and diversified use scenes are met.

A connector for adjustably connecting an RVDT (rotary variable differential transformer) and a reductor shaft. The connector includes a body defining a bore configured to receive the reductor shaft. The bore has an inner wall and a threaded tightening member which is substantially parallel to a main axis (AA, BB) of the bore. A portion of the body is configured to deform upon tightening of the tightening member such that, when the reductor shaft is received by the bore, the reductor shaft is gripped by at least a portion of the inner wall.

The present invention relates to a system for controlling magnetic flux in transformers for output voltage variation without tap switching by contacts and / or semiconductors, according to the principles used today in the prior art.

The application relates to the technical field of antenna matching and tuning devices, in particular to a medium wave antenna matching assembly based on double helix inductors, which comprises a shell, a coil set arranged in the shell, a movable magnetic core rod, a lead screw, a variable capacitor, a mounting plate, a coarse tuning knob, a fine tuning knob, an antenna interface and a speed reducer; wherein an operation table is arranged on the shell, the coarse tuning knob and the fine tuning knob are arranged on the operation table; the coil set comprises a first double helix inductor, the magnetic core rod is arranged along the axial direction of the first double helix inductor and can axially move relative to the first double helix inductor; the lead screw is arranged in the shell and is in transmission connection with the magnetic core rod, the coarse tuning knob is in transmission connection with the lead screw so as to drive the magnetic core rod to perform coarse tuning; the variable capacitor is arranged on the mounting plate, the fine tuning knob is in transmission connection with the variable capacitor through the speed reducer so as to perform fine tuning on the variable capacitor; and the antenna interface is arranged on the shell and is electrically connected with the first double helix inductor and the variable capacitor to form an antenna matching network.

The application relates to the technical field of adjusting devices, and discloses a self-adaptive reactance adjusting device for a variable current voltage regulator, which comprises a screw cap, a containing cavity arranged in the screw cap, and a rotating rod, the screw cap is sleeved on the outer surface of the rotating rod and can rotate with the central axis of the rotating rod as the rotation center, and the rotating rod is arranged to rotate simultaneously with the rotating rod when the screw cap rotates. When the semicircular ring can move along the diameter direction, the friction block can be driven to move along the diameter direction of the semicircular ring, the friction block is driven to move close to or away from the friction ring by the semicircular ring, the force of the friction block abutting against the friction ring is increased or decreased, the size of the friction force during movement is changed, the operator can know that the generated friction resistance is different under different gear positions, the operator can notice the adjusting range and proportion, the operator can be prevented from making mistakes, and it is ensured that no error occurs in subsequent reactance adjustment.

A wireless power transmission device is provided. The wireless power transmission device includes a transmission coil including a first member, which has one end and the other end forming a first angle with a plane, and a second member, which is arranged on the plane and is connected to each of the one end and the other end of the first member, an impedance sensor for outputting a voltage value corresponding to an impedance change amount of a resonance circuit, which includes the transmission coil, a magnetic body having a side surface that is dented, the dented side surface facing a portion of the transmission coil, a motor for moving the magnetic body, memory storing one or more computer programs, and one or more processors communicatively coupled to the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the wireless power transmission device to receive the output voltage value from the impedance sensor, calculate the difference value between a reference voltage value and the received voltage value, determine control information about the motor on the basis of the calculated difference value, and drive the motor through the determined control information so as to control the distance between the magnetic body and the portion of the transmission coil.

Embodiments of this disclosure are directed to devices that allow for adjusting of device parameters in a manner that does not involve power dissipation in an essential way. Thus, power demands when such devices are used in applications can be insignificant. This applies to both springs and inerters, which constitute basic lossless building blocks of mechanical device systems, and are analogues of inductors and capacitors in electrical circuits. Embodiments of this disclosure are also directed to a lossless adjustable 2-port transformer, and realization of mechanical translational and rotary transformers are set forth in the following. Embodiments of this disclosure allow for reduction of power demands in adjusting device parameters.

The invention discloses a novel magnetic integrated inductor capable of automatically adjusting inductance value along with working conditions, which relates to the technical field of power electronics and comprises a magnetic integrated module used for being responsible for energy storage and magnetic circuit coupling; the magnetic control adjusting module is assembled on the magnetic integration module; the working condition detection module is assembled on the magnetic integration module and is used for collecting working condition parameters of the magnetic integration module; and the autonomous control module is connected with the magnetic control adjusting module and the working condition detection module, receives the working condition parameters collected by the working condition detection module, generates control signals according to the working condition parameters and sends the control signals to the magnetic control adjusting module, and the magnetic control adjusting module changes magnetic resistance according to the control signals so as to adjust the inductance value. According to the invention, no mechanical moving part is adopted, full-electric signal adjustment is adopted, the working temperature range is wide, and the stability is higher; a fixed inductor in an existing converter or inverter can be directly replaced, so that the requirements under different load working conditions are met at the same time, and the original system structure does not need to be greatly modified.

A control system includes a variable inductor including a magnetic core, a first coil wound around the magnetic core, and a control coil wound around the magnetic core; and a sensor coil wound around the magnetic core, wherein the first coil wound around the magnetic core is coupled between first and second terminals and has a variable inductance across the first and second terminals.

The invention relates to an inductive component (1) comprising a winding (2) and at least one adjusting body (4, 4_1, 4_2, 4_n) for adjusting the inductance (L) of the inductive component (1), wherein the adjusting body (4, 4_1, 4_2, 4_n) comprises ferromagnetic material and surrounds at least some areas of the winding (2), wherein the inductance (L) is adjusted via the shape and / or position and / or number of the adjusting bodies (4, 4_1, 4_2, 4_n).

The present invention relates to a system for controlling magnetic flux in transformers for output voltage variation without tap switching by contacts and / or semiconductors, according to the principles used today in the prior art.

Provided is an electro-magnetic compatibility (EMC) filter including a lower bobbin having a U-shaped cross-sectional shape, a lower core including a magnetic material having a U-shaped cross-sectional shape and disposed on the lower bobbin, a bus bar disposed on the lower core, an upper bobbin having a hollow inside, having a bexahedral shape with one side open, and configured to cover an upper portion of the lower bobbin, and an upper core including a magnetic material having a plate-like shape, disposed in an internal space of the upper bobbin, and disposed on the lower core (U core) to cover the bus bar with a gap maintained by the bus bar between the upper and lower cores when the lower bobbin and the upper bobbin are coupled to each other.

The invention discloses a passive balanced transient variable inductor structure of a Buck converter, and aims to improve the dynamic response capability of the converter in a low-voltage large-current scene. The structure comprises a left magnetic column and a right magnetic column which are symmetrically arranged, a central column with an air gap, a main winding and an auxiliary winding, and a passive energy storage network consisting of a diode, an energy storage capacitor, an inductor and a bleeder resistor. When the load suddenly increases, the energy storage network generates pulsating current to excite the magnetic resistance of the left and right magnetic columns to increase, the inductance value is transiently reduced, and the dynamic response speed of the Buck converter is improved; and the inductance recovers the rated value after the load shedding is finished. Through the reverse winding design of the main winding and the auxiliary winding, the magnetic flux density balance of the left and right magnetic columns is ensured, and the magnetic core utilization rate is obviously improved. Compared with a traditional fixed inductor scheme, the method does not need active control, can remarkably shorten the voltage adjustment time, has the advantages of high frequency and high power density, and is suitable for scenes with strict dynamic performance requirements.

A connector (1,100) for adjustably connecting an RVDT (rotary variable differential transformer) and a reductor shaft (5). The connector (1, 100) includes a body (2, 102) defining a bore (11, 111) configured to receive the reductor shaft (5). The bore (11, 111) has an inner wall and a threaded tightening member (17, 117) which is substantially parallel to a main axis (AA, BB) of the bore (11, 111). A portion of the body (2, 102) is configured to deform upon tightening of the tightening member (17, 117) such that, when the reductor shaft (5) is received by the bore (11, 111), the reductor shaft (5) is gripped by at least a portion of the inner wall.

A control system includes a variable inductor including a magnetic core, a first coil wound around the magnetic core, and a control coil wound around the magnetic core; and a sensor coil wound around the magnetic core, wherein the first coil wound around the magnetic core is coupled between first and second terminals and has a variable inductance across the first and second terminals.

A three-dimensionally shaped coil can be manufactured at low cost and easily and uses a planar coil array. In the planar coil array, a flexible board comprises: a first planar coil that has a first spiral shape in which a first conductor is wound in a left-handed or right-handed manner with respect to a first center; and a second planar coil in which a second conductor in the same layer as the first conductor formed on the flexible board is wound with respect to a second center in the same manner of winding as the first coil, the second planar coil having an angular misalignment from the first spiral shape, being disposed adjacent to the first planar coil in a predetermined direction, and being electrically connected to the first planar coil. The flexible board is bent, thereby forming a three-dimensionally shaped coil.

A linear variable differential transducer (LVDT) includes a primary coil, a first secondary coil, and a second secondary coil. Each of the first and second secondary coils comprises a wound portion that is wound around a longitudinal axis of the LVDT, and first and second non-wound portions at either end of the wound portion. The wound portion meets the first and second non-wound portions at locations that are separated from each other in a direction along the longitudinal axis.

An adjustable inductor includes an annular magnetic core defining a plurality of gaps, a compressible gap material positioned in the gaps, at least one winding wound on the magnetic core, a force applying structure, and a film substantially covering the adjustable inductor. The force applying structure is operable to apply a force to the magnetic core to adjust the gaps, and thereby adjust an inductance of the adjustable inductor. The film is configured to prevent movement of the force applying structure when above a predetermined temperature threshold, and to allow movement of the force applying structure when below the predetermined threshold.

A superconducting integrated circuit is fabricated by depositing a ground plane to at least partially overlie a substrate, depositing an insulating layer to at least partially overlie the ground plane, depositing a superconducting layer to at least partially overlie the insulating layer, and forming a superconducting feature in the superconducting layer. An inductance of the superconducting feature is tunable by adjusting a bias current in the ground plane. The ground plane is electrically communicatively coupleable to an electrical ground. Depositing a ground plane includes depositing a first superconducting material to at least partially overlie the substrate and depositing a second superconducting material to at least partially overlie the first superconducting material. A second critical current density of the second superconducting material is higher than a first critical current density of the first superconducting material.

A simultaneous wound solenoid position indicator includes: a rod for raising or lowering a control rod such that a degree to which the control rod is inserted into a core is decreased or increased; a magnetic body; and a solenoid module that receives power from an external source and generates a magnetic field toward the magnetic body. An inductance generated by the solenoid module changes due to interaction with a magnetic field of the magnetic body as the control rod is driven up or down. The solenoid module includes a plurality of solenoids, and the plurality of solenoids are wound to surround the rod while being spaced at a predetermined distance radially outward from the rod.

To provide a magnetic component that can easily control leakage inductance.SOLUTION: A magnetic component includes a core including first and second protrusions extending in a first direction, a first conductor including a first flat wire that defines a first turn that extends around the first protrusion such that a smallest dimension of the first flat wire is parallel or substantially parallel to the first direction, and a second conductor including a second flat wire that defines a second turn that extends around the second protrusion such that a smallest dimension of the second flat wire is parallel or substantially parallel to the first direction. The first and the second turns are adjacent to each other and are off set in two dimensions to define a gap between adjacent turns of the first and the second conductors.SELECTED DRAWING: Figure 3