272 results about "Coil inductance" patented technology

This invention provides a semiconductor integrated circuit for drive and a module for building a synchronous rectifier type switching regulator that is able to correctly detect and prevent a reverse current flowing through a coil (inductance element) during light load using a comparator and has a good power efficiency. In a synchronous rectifier type switching regulator including a reverse current detection circuit that is able to detect a state in which a reverse current flows through the inductance element (coil) and a reverse current prevention function, a switching element for synchronous rectification is formed by a plurality of parallel transistors and the transistors are controlled so that a part of them are not driven during light load.

The invention discloses a ground fault fully compensated controllable voltage source output voltage computing method, comprising the steps of obtaining circuit ground capacitance, leakage resistance,fault ground resistance, arc suppression coil inductance, resistance and controllable voltage source internal resistance when a ground fault occurs; computing parallel impedance of a circuit ground parameter and a compensation inductance parameter according to the arc suppression coil inductance, the resistance, the leakage resistance and the circuit ground capacitance; and computing a controllable voltage source output voltage according to the fault ground resistance, the controllable voltage source internal resistance and the parallel impedance of the circuit ground parameter and the compensation inductance parameter. According to the method, in a voltage source access mode, the state problem that an arc suppression coil inductance parameter and the circuit ground capacitance approximateto power frequency resonance does not need to be taken into consideration; control is relatively easy; a fault current can be effectively compensated; and arc quenching is carried out on a fault point. According to the method, phase and amplitude of the output voltage are obtained through computing, the current at the fault point is quenched through control over the phase and amplitude of a controllable voltage source, and safe and stable operation of a power grid is ensured.

A coil module is provided which has been reduced in size and thickness by incorporating a material and a structure resistant to magnetic saturation. The coil module includes a magnetic shielding layer containing a magnetic material, and a spiral coil. The magnetic shielding layer has a plurality of magnetic resin layers containing magnetic particles, and at least a portion of the spiral coil is buried in a portion of the magnetic resin layers. This allows a reduction in size and thickness while achieving a heat dissipation effect by the magnetic resin layers. In addition, since magnetic resin layers resistant to magnetic saturation are provided, the coil inductance changes only slightly even in an environment where a strong magnetic field is applied, and thus stable communication can be provided.

A means for fabrication of solenoidal inductors integrated in a semiconductor chip is provided. The solenoidal coil is partially embedded in a deep well etched into the chip substrate. The non-embedded part of the coil is fabricated as part of the BEOL metallization layers. This allows for a large cross-sectional area of the solenoid turns, thus reducing the turn-to-turn capacitive coupling. Because the solenoidal coils of this invention have a large diameter cross-section, the coil can be made with a large inductance value and yet occupy a small area of the chip. The fabrication process includes etching of a deep cavity in the substrate after all the FEOL steps are completed; lining said cavity with a dielectric followed by fabrication of the part of the coil that will be embedded by deposition of a conductive material metal through a mask; deposition of dielectric and planarization of same by CMP. After planarization the fabrication of the remaining part of the solenoidal coil is fabricated as part of the metallization in the BEOL (i.e. as line/vias of the BEOL). To further increase the cross section of the solenoidal coil part of it may be built by electrodeposition through a mask on top of the BEOL layers.

A float-type flowmeter measures the rate of a fluid flowing upwardly through a tube based on the position of a float movably disposed in the tube and including a magnetic material. A coil is wound around the tube such that the intervals gradually decrease in an axial direction. The coil is excited by an alternating current supplied from an inductance change detector. The inductance change detector detects a change in the inductance of the coil which is caused when the float moves in the axial direction, and generates a voltage. A voltage-to-position (flow rate) converter determines a flow rate from the voltage corresponding to the position of the float.

A light-emitting diode driver circuit includes: a first-rectifier circuit to output a first-rectified voltage; a transformer including primary and secondary coils and an auxiliary coil inductively coupled to the primary or secondary coils, the primary coil being applied with the first-rectified voltage; a transistor connected in series to the primary coil; a second-rectifier circuit to output a second-rectified voltage obtained by rectifying a voltage generated in the auxiliary coil; a capacitor to be charged with the second-rectified voltage; and a control circuit to control on and off of the transistor based on a charging voltage of the capacitor so that the charging voltage becomes equal to a predetermined voltage, the secondary coil outputting a voltage that varies with a frequency corresponding to a frequency of the first-rectified voltage and that corresponds to a turns ratio between the primary and secondary coils, as a voltage for driving a light-emitting diode.

In a high-frequency coil device having small dispersion in coil inductance and suitable for use in GHz band and a method of manufacturing the high-frequency coil device, a spirally-shaped fine-pitch coil is embedded in the surface of a polyimide layer as a dielectric substrate so that the bottom surface and side surface of the coil is covered by the polyimide layer. The spirally-shaped coil has an Ni—Cu laminate structure in which an Ni plating layer and a Cu plating layer are laminated, and also the side surface thereof is made substantially vertical while the width thereof is uniform with high precision. The surface of the spirally-shaped coil, that is, the surface of the Ni plating layer serving as the upper layer is coated with an Au plating layer.

A method of calibrating parameters of an apparatus for measuring a back electromotive force (BEMF) of a voice coil motor (VCM) for moving a head on a disk, the apparatus including the VCM having a coil resistance Rm, a coil inductance Lm, and a sensing resistance Rs, including: controlling the VCM to sequentially perform a track following operation of the head on a first track, a transferring operation of the head from the first track to a second track, and a track following operation of the head on the second track; sampling a differential voltage Vadc between a voltage across the VCM and a voltage across the sensing resistance Rs and a VCM driving current Im during the transferring operation; calculating a slope S based on a ratio of a first integration value to a second integration value, where the first integration value is obtained by integrating a product of the sampled differential voltage Vadc and the VCM driving current Im during the transferring operation, the second integration value being obtained by integrating a square of the VCM driving current Im during the transferring operation, the slope S being defined by the equation S=Rm−Gb×Rs, Gb being a gain of an amplifier for amplifying the voltage across the sensing resistance Rs; and calibrating the parameters of the apparatus using the slope S.

The invention discloses a synchronous switch control circuit for a common electromagnetic contactor and belongs to the technical field of reactive compensation and harmonic filtering of a power system. The common electromagnetic contactor is adopted by a synchronous switch, a control circuit for a contactor coil is properly designed on the premise that the structure of the common contactor is not changed, power supply of an alternating current (AC) 220V coil of an AC contactor is changed into power supply of a direct current (DC) 220V stabilized voltage supply, the switch on of the switch is designed into total voltage coil suction and is in low-voltage electricity-saving suction, and the switch off of the switch is designed into oscillating discharge of a coil inductor L, a capacitor C and a resistor R, inductance energy of the coil is rapidly absorbed, and a function of rapidly disconnecting the contactor is realized. The requirement of the synchronous switch is met through the common electromagnetic contactor, an expected effect is achieved, and due to the adoption of the common electromagnetic contactor, an accurate shock-free current switched capacitor bank and a reactor are implemented.

A coil inductor and buck voltage regulator incorporating the coil inductor are provided which can be fabricated on a microelectronic element such as a semiconductor chip, or on an interconnection element such as a semiconductor, glass or ceramic interposer element. When energized, the coil inductor has magnetic flux extending in a direction parallel to first and second opposed surfaces of the microelectronic or interconnection element, and whose peak magnetic flux is disposed between the first and second surfaces. In one example, the coil inductor can be formed by first conductive lines extending along the first surface of the microelectronic or interconnection element, second conductive lines extending along the second surface of the microelectronic or interconnection element, and a plurality of conductive vias, e.g., through silicon vias, extending in direction of a thickness of the microelectronic or interconnection element. A method of making the coil inductor is also provided.

The invention provides a giant magnetostrictive micro-displacement self-sensing driving method and an actuator, belongs to the field of ultra-precise machining and measurement, and particularly relates to a rapid ultra-precise positioning motion control method and device. The giant magnetostrictive micro-displacement self-sensing driving method can realize self-sensing of force by measuring inductance of a coil through magnetic conductivity variation of a giant magnetostrictive material, namely inductance of an exciting coil, caused by an external force, based on an inverse magnetostrictive effect. According to the giant magnetostrictive micro-displacement self-sensing driving method provided by the invention, the inductance of the exciting coil can be measured by an inductance bridge, so that matched inductive reactance and impedance can be adjusted, and the bridge is balanced. The bridge is not balanced when being stressed by disturbance of the external force, and an inductance value variation of the exciting coil can be obtained by measuring unbalanced voltage through differential motion and operational amplification, so that a disturbing force can be obtained. The actuator mainly consists of a cylindrical magnetostrictive rod, the exiting coil, an elastic membrane and a water cooling sleeve. According to the giant magnetostrictive micro-displacement self-sensing driving method provided by the invention, the cylindrical coil not only provides a driving magnetic field but also is used as a sensor for measuring the disturbing force. In a high-speed ultra-precise positioning motion process, the error interference generated by the external disturbing force is reduced.

An inductive power transfer pickup circuit has a pickup coil (L₂) and tuning capacitor (C₂) connected in series to provide a series resonant circuit. A bi-directional switch (S₁) is used to vary the phase angle between the open circuit pickup coil voltage (V_oc) and the pickup coil inductor current (i_L) to provide a controlled AC supply to an output of the pickup.

An integrated package provides contactless communication through a coupling mechanism embedded in the package. Package types include Surface Mount Technology (SMT), Low Temperature Co-fired Ceramic (LTCC) technology, and dual-in-line integrated circuit pressed ceramic packages generally. The package can include an acoustic wave device (AWD) sensor such as a surface acoustic wave (SAW) device or a bulk acoustic wave (BAW) device. Coupling includes inductive and capacitive effects through plates, loops, spirals, and coils. Coil inductance and SAW capacitance can be parallel resonant at the desired SAW resonance with the coil impedance higher than the SAW impedance, minimizing load-pull effects.

A converter mounting comprises a memory coil inductance (8), a memory primary capacitor (3) mounted upstream of said coil inductance, and a memory secondary capacitor (4), in particular, a piezoelectric actuator, mounted downstream of said coil inductance. Through control of a primary circuit element (12) and of a secondary circuit element (14), the energy of the memory primary capacitor (3) can be transferred to the memory secondary capacitor (4) and recovered.

An apparatus for and a method of measuring, in real-time, and indicating power consumption of a product powered by a switching mode power supply (SMPS). Power is supplied to the product through a transformer having a predetermined primary coil inductance, wherein a current of a primary coil of the transformer is turned ON and OFF by pulse-width modulation to supply the power to the electronic device. A drive voltage across the primary coil is monitored and a pulse waveform having a first level corresponding to an ON time of the current in the primary coil and a second level corresponding to an OFF time of the current in the primary coil is developed. Power consumption is calculated based on the drive voltage, the ON time of the current in the primary coil, the predetermined primary coil inductance, and a switching frequency of a pulse width modulator of the SMPS.

Disclosed is a three-dimensional standard magnetic field generating device based on phase synchronization. The device is composed of a variable-frequency power source module, a capacitance matching module, a phase detecting module and a three-dimensional Helmholtz coil. Firstly, voltage and frequency of the variable-frequency power source module are set by the variable-frequency power source module according to requirements, and corresponding capacitance is chosen by the capacitance matching module so as to reduce the influence of coil inductance on magnetic induction intensity, and then one side of adjusted three-phase power source signals is connected to the phase detecting module so as to ensure the phase synchronization of a three-dimensional magnetic field by adjusting an initial angel of a variable-frequency power source according to the phase detecting result, and another side of the adjusted three-phase power source signals is connected to the three-dimensional Helmholtz coil so as to enable the three-dimensional Helmholtz coil to generate a dynamic alternating magnetic field. Magnetic fields with even height in alternating current or direct current can be generated in any direction so as to provide a magnetic field environment for characteristic testing of a magneto-dependent sensor. The three-dimensional standard magnetic field generating device is good in practical value and application prospect in the technical field of electronic measurement.

An electromechanical rotary actuator includes a rotor and a stator having one or more slots into which one or more coils are placed. The stator includes a rotor position restoring means which overcomes cogging outside a desired rotation range. The rotor position restoration means may include one or more restoring magnets or optionally include a contoured cavity within the stator proximate the rotor. One stator includes teeth having contoured ends forming a portion of the aperture within which the rotor operates. Distal ends of the teeth form a relatively large gap compared to typical actuators, wherein the gap is sized to the rotor magnet. An actuator desirably having a high torque constant, low coil resistance and a low coil inductance is provided.

Disclosed are a horizontal inductive tension detecting device for a steel wire rope and a horizontal inductive tension detecting method for the same. The horizontal inductive tension detecting device comprises a shell symmetrically and fixedly fastened on the steel wire rope, two bases are symmetrically arranged in the shell, sliding rods extending out of the corresponding bases are arranged in the two bases respectively, a roller abutted to the steel wire rope is arranged at the top of each sliding rod, a base plate fixed onto the corresponding base is sleeved at the tail of each sliding rod, insulating sleeves are symmetrically arranged on the upper portion and the lower portion of the right end face of each base plate, a sliding plate is arranged in the middle of each sliding rod, a spring sleeved on the corresponding sliding rod is arranged between each sliding plate and the corresponding base plate, cylindrical magnetic conducting iron cores in clearance fit with the insulating sleeves are symmetrically arranged on the upper portion and the lower portion of the left end face of each sliding plate, and a signal processing unit connected with a connecting terminal is arranged on the left end face of each base plate. Coil inductance changes along with the diameter of the steel wire rope and is converted into voltage signals through a bridge circuit, and finally the voltage signals are converted into the tension of the steel wire rope. The horizontal inductive tension detecting device is simple in structure, convenient in installation, high in measuring precision and capable of accurately measuring the tension of the steel wire rope in real time.