99results about "Continuously variable inductances/transformers" patented technology

The utility model discloses a ring-shaped inductor component convenient to adjust inductance value, which comprises a ring-shaped inductor, an insulating base, a metal slip ring and a movable metal rod, the ring-shaped inductor comprises a magnetic core and an enameled coil, the ring-shaped inductor and the metal slip ring are respectively arranged on the insulating base, the T-shaped end of the movable metal rod is arranged between the metal slip ring and the ring-shaped inductor, and the movable metal rod is arranged on the insulating base. The two sides of the T-shaped end are in contact with the inner wall of the metal slip ring and the corresponding enameled coil on the annular inductor respectively and can slide in the circumferential direction. According to the utility model, by utilizing the structure that the movable metal rod is in conductive contact with one turn of enameled coil of the annular inductor and is led out through the metal slip ring, the purpose of changing the effective turn number of the enameled coil, namely changing the inductance value, is realized, and the function of adjusting the inductance value can be easily realized on the premise of not disassembling any part of the inductor assembly; operation is easy and convenient, the application cost is reduced, the adjustment number of inductance values is large, and the requirement for adjustment of a large number of inductance values can be met.

A representative phase-shift based method for using a transformer system to detect movement of an object, and associated systems and methods are disclosed. A representative transformer system detects movement of an object and includes an excitation coil configured to receive an excitation coil input signal that results from an input sinusoidal signal. The transformer further includes first and second sensing coils, and a core configured to be operatively coupled to the object. The core moves relative to the first and second sensing coils when the object moves. First and second impedance loads are connected to the first and second sensing coils, respectively. The two impedance loads have different phase-shifting characteristics. A phase-shift sensing circuit determines a phase-shift between the excitation coil input signal and the input sinusoidal signal that is correlated with a position of the core relative to the first and second sensing coils.

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.

The utility model discloses a patch type variable inductor which comprises a base and a magnetic core, the top of the base is provided with a plane portion used for adsorption, a wrapping post inclined relative to the plane portion and staggered with the plane portion is arranged in the base, a coil is wound on the wrapping post, a threaded hole is formed in the wrapping post in the axial direction of the wrapping post, and the magnetic core is connected into the threaded hole in a threaded mode. According to the inductor, the wrapping post is obliquely arranged, so that a complete plane part can be reserved at the top of the base for adsorption of automatic surface mounting equipment, and the inductor can meet the requirement of automatic surface mounting. And the wrapping posts and the plane parts are arranged in a staggered manner, and the plane parts do not interfere with the wrapping posts and the magnetic core, so that the inductance value can still be adjusted by adjusting the position of the magnetic core after the inductor is assembled to a PCB. Therefore, the inductor can be suitable for automatic surface mounting production on the premise of ensuring that the inductance value is adjustable, so that the assembling efficiency of the inductor is improved, and the yield of surface mounting manufacturing is improved.

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.

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 application relates to the field of long-wave signaling technology, and in particular to a tuning system and a control method, including a control device, a first adjustable inductor and a first position detection component, wherein the first adjustable inductor includes a first moving frame, a first driving member, a first fixed frame sleeved on the periphery of the first moving frame, a first moving coil arranged on the first moving frame and a first stator coil arranged on the first fixed frame, the first driving member is used to drive the first moving frame to rotate relative to the first fixed frame, when the first moving frame rotates, the overlap between the first moving coil and the first stator coil changes, the first position detection component is used to detect the position of the moving frame, the output end of the first position detection component is connected to the input end of the industrial data acquisition module, the output end of the industrial data acquisition module is connected to the control end of the first driving member, and the industrial data acquisition module is connected to the control module in communication. The present application can achieve the effect of fast tuning.

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.

Device (1) for detecting a key press comprising a circuit substrate (2), a key module (4) attached to the circuit substrate (2) with a keycap (3) and a movement mechanism (15) for moving the keycap (3) relative to the circuit substrate (2) between a rest position and an actuation position, and a device (10) for detecting the movement of the keycap (3) relative to the circuit substrate (2), wherein the movement mechanism (15) has at least one one-piece or multi-piece movement element (5) which, when the keycap (3) is moved relative to the circuit substrate (2), also moves at least partially relative to the circuit substrate (2) and comprises or consists of a conductive material, wherein the conductive material encloses a continuous recess (13) so that a current flow around the recess (13) is possible. wherein the device (10) for detecting the movement of the keycap (3) relative to the circuit substrate (2) comprises an electrical resonant circuit (11) with at least one capacitor (C1) and with at least one primary coil (L1) stationary in relation to the circuit substrate (2) with one or more coil turns and at least one secondary coil (L2) with a short-circuited turn, wherein the primary coil (L1) is arranged on or in the circuit substrate (2) on the rear side of the keypad module (4) opposite the keycap (3), wherein the at least one moving element (5) forms the at least one secondary coil (L2), wherein the conductive material surrounding the recess (13) is the respective short-circuited winding of the secondary coil (L2), wherein the primary coil (L1) and the at least one secondary coil (L2) are inductively coupled to each other and the strength of the inductive coupling between the primary coil (L1) and the at least one secondary coil (L2) and thus at least one physical quantity of the resonant circuit (11) changes when the keycap (3) and thus the at least one moving element (5) forming the at least one secondary coil (L2) is moved between rest position and actuation position, wherein the device (10) for detecting the movement of the keycap (3) relative to the circuit substrate (2) comprises a measuring device for detecting and / or processing at least one physical quantity of the electrical resonant circuit (11) that changes during the movement of the keycap (3) between rest position and actuation position and outputs at least one electrical signal that depends on the change in the physical quantity, characterized by the fact that the movement mechanism (15) is a parallel mechanism.

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.

A rotary variable differential transformer for measuring angular displacement and method of manufacturing the same are provided herein. The rotary variable differential transformer includes a stator configured to house a primary coil configured to receive an alternating current, a first secondary coil electromagnetically coupled to the primary coil, and a second secondary coil electromagnetically coupled to the primary coil. The rotary variable differential transformer also includes a rotor positioned concentrically within the stator. The rotor is configured to receive a shaft and rotate with the shaft while the stator remains stationary. The primary coil is positioned at a first radial position within the stator spaced between about 90 to 150 degrees from each of the first secondary coil and the second secondary coil.

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.

The present disclosure relates to an assembly for varying inductance. The assembly includes a stator configured to generate at least one pair of magnetic poles that are magnetically opposed. A line extending from one of the at least one pair of magnetic poles to the remaining of the at least one pair of magnetic poles defines a first direction. The assembly also includes a rotor adjacent to the stator. The rotor includes a rotor body formed from a first material having a first effective magnetic permeability. The rotor body defines a plurality of recesses extending parallel to an axis of rotation of the rotor. The axis of rotation extends along the first direction. The rotor also includes a plurality of bars formed from a second material. The plurality of bars are disposed within the plurality of recesses, respectively. The second material has a second effective magnetic permeability. Rotation of the rotor about the axis of rotation causes a periodic alternation of the inductance of the assembly.

A rotary variable differential transformer for measuring angular displacement and method of manufacturing the same are provided herein. The rotary variable differential transformer includes a stator configured to house a primary coil configured to receive an alternating current, a first secondary coil electromagnetically coupled to the primary coil, and a second secondary coil electromagnetically coupled to the primary coil. The rotary variable differential transformer also includes a rotor positioned concentrically within the stator. The rotor is configured to receive a shaft and rotate with the shaft while the stator remains stationary. The primary coil is positioned at a first radial position within the stator spaced between about 90 to 150 degrees from each of the first secondary coil and the second secondary coil.

Embodiments of the present disclosure are directed towards rotary variable differential transducers. The transducer may include a housing and an armature shaft included within the housing. The transducer may further include an input shaft configured to mate with an airplane shaft. The input shaft may be located independently from the armature shaft.

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.

An on-chip transformer includes a primary coil and a secondary coil, each of which includes multiple metal layers; all metal layers are stacked in the height direction of the primary coil and the secondary coil; each metal layer includes a plurality of independent metal rings with the same structure; the metal rings are configured as a spiral structure diffused from the inside to the outside; the top metal layer in the primary coil is provided with N input terminals; the top metal layer in the secondary coil has (N+1) output terminals, where N is an integer; the signal enters through the input terminal and then outputs from the output terminal. The present invention also proposes a manufacturing process for preparing the above-mentioned on-chip transformer. The present invention has a large coupling area and a small occupied area, and is also suitable for half-bridge or full-bridge DC-DC converters, and can achieve output of any proportion by adjusting the voltage by boosting, bucking or equalizing, balancing the resistance and reducing the parasitic effects in the coil.

A current transformer (1) comprises a magnetic circuit (2) made of magnetic material for placement around a primary conductor (3), and a secondary winding (4) wound around a portion (5) of the magnetic circuit (2) for delivering a secondary current to a processing circuit (32). In the current transformer, the magnetic circuit (2) comprises at least one device (6, 6A, 6B) for varying the magnetization of a portion of the magnetic circuit as a function of temperature, so as to limit or reduce the magnetic flux in the magnetic circuit when the temperature of the magnetic circuit increases. A protection device and a circuit breaker comprising such a transformer.

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.