42 results about "Internal inductance" patented technology

An EAS device, and methods for making the device for tuning the resonant frequency of the same is disclosed. The EAS device includes: an outer inductor having one end coupled to a linear or nonlinear capacitor plate; an inner inductor having one end coupled to the other type of capacitor; a first dielectric film on the outer and inner inductors and the capacitor plates coupled thereto, having openings exposing other ends of the outer and inner inductors; a second linear capacitor plate on the dielectric film; a second nonlinear capacitor plate on the dielectric film; a second dielectric film containing holes for the second linear and nonlinear capacitor plates, and exposing the other ends of the first and second inductors; and first and second conducting straps on the second dielectric film, configured to electrically connect one of the exposed inductor ends to a corresponding second capacitor plate.

A disk drive emergency retract architecture for providing power to a voice coil motor (VCM) to retract a transducing head from a surface of a recordable medium during loss of power from an external power supply. The disk drive emergency retract architecture comprises a spindle motor, having an internal inductance and an internal resistance, for spinning the recordable medium. The spinning recordable medium creates a back electromotive force (BEMF) in the spindle motor. A boost circuit transfers the back electromotive force located in the spindle motor to a capacitor which stores and supplies power to the VCM. The capacitor is connected to a power switch circuit, which supplies power from the capacitor to the VCM when the power switch circuit is in a conducting state and prevents power from being supplied to by the capacitor to the VCM when the power switch circuit is in a non-conducting state. A retract circuit supplies a signal to the power switch circuit, dictating whether the power switch circuit is in the conducting state or the non-conducting state. The retract circuit operates to alternate the power switch circuit between the conducting state and the non-conducting state at a set frequency, resulting in power being provided from the capacitor to the VCM at this frequency.

The invention provides a folded thin film capacitor and a fabrication method thereof. The folded thin film capacitor comprises a metal thin, two metal spraying layers (4a and 4b), two electrode terminals and a shell, wherein the two electrode terminals are respectively connected with the two metal spraying layers (4a and 4b), the folded thin film capacitor is characterized in that the metal film comprises a first metal evaporation film (2a), a second metal evaporation film (2b) and an electrical insulation polymer basic layer (1), the electrical insulation polymer basic layer (1) is sandwiched between the two metal evaporation films (2a and 2b), the metal film is repeatedly folded to form a cuboid block in a longitudinal direction, folded angles of the first metal evaporation film (2a) and the second metal evaporation film (2b) are superposed to respectively form a first side surface and a second side surface of the block, and the two metal spraying layers (4a and 4b) are respectively arranged on the first side surface and the second side surface. By the folded thin film capacitor and the fabrication method thereof, the problem that a metal spraying electrode at an end part of the thin film capacitor is seldom in contact with a metal film contact point is solved, heat generation of the end part of the capacitor is reduced, the internal inductance and the internal resistance of the capacitor are reduced, the lifetime of the capacitor is prolonged, and the folded thin film capacitor is particularly suitable for the field of large-current application.

In an inspection jig (1) for electrical inspection of printed circuit boards, an electrode section (40) has an electrode (41) disposed on a surface of an electrode plate (42), and a contact (10) includes a conductive contact needle (11), a compression coil spring (12), and an intermediate member (13) that are arranged coaxially for use. The contact needle (11) has a distal end (111), a projection (112), a larger diameter portion (113), and an intermediate portion (114), and the intermediate member (13) has a cylindrical intermediate end (131), a guide portion (132), and an electrode end (133). The electrode end (133) has a cut section at an oblique angle, is bent to have a proximal end (133a) in the vicinity of a central portion, and is held by a contact holder (30) to have an initial load. The electrode (41) is smaller in diameter than the contact (10). Thus obtained are an inspection jig and a contact allowing for facilitated fabrication and maintenance, with internal inductance improved and reliable conductive contact achieved by use of simple components.

A disk drive emergency retract architecture for providing power to a voice coil motor (VCM) to retract a transducing head from a surface of a recordable medium during loss of power from an external power supply. The disk drive emergency retract architecture comprises a spindle motor, having an internal inductance and an internal resistance, for spinning the recordable medium. The spinning recordable medium creates a back electromotive force (BEMF) in the spindle motor. A boost circuit transfers the back electromotive force located in the spindle motor to a capacitor which stores and supplies power to the VCM. The capacitor is connected to a power switch circuit, which supplies power from the capacitor to the VCM when the power switch circuit is in a conducting state and prevents power from being supplied to by the capacitor to the VCM when the power switch circuit is in a non-conducting state. A retract circuit supplies a signal to the power switch circuit, dictating whether the power switch circuit is in the conducting state or the non-conducting state. The retract circuit operates to alternate the power switch circuit between the conducting state and the non-conducting state at a set frequency, resulting in power being provided from the capacitor to the VCM at this frequency.

An impulse capacitor belongs to the capacitor. A problem of high equivalent series inductance of metallized-film pulse capacitor can be solved. The impulse capacitor is suitable for a pulse power system in which the internal inductance of the capacitor is a nanohenry grade. In the invention, a first group of capacitance film, a first polyester insulation film, a second group of capacitance film, a second polyester insulation film, a third group of capacitance film and a third polyester insulation film are successively wound from inside to outside on a mandrel. A shell is installed out of the third polyester insulation film. Upper end surfaces of the first and second groups of the capacitance films are connected and lower end surfaces are insulated. The lower end surfaces of the second andthe third groups of the capacitance films are connected and the upper end surfaces are insulated. The third group of capacitance film is insulated with the shell. The lower end surface of the first group of capacitance film is taken as a low voltage extraction electrode and is connected with the impulse capacitor shell. The upper end surface of the third group of the capacitance film is taken as high voltage extraction electrode and is connected with a high voltage output terminal of the impulse capacitor. The impulse capacitor can bear the higher application voltage so that the equivalent series inductance of a whole capacitor can be reduced and the nanohenry grade can be reached.

The invention discloses a calculation method for direct-current loop impedance of a hybrid bipolar direct-current transmission system. The calculation method includes the steps: (1) calculating internal inductance of an LCC (line-commutated converter) on a rectifier side and an equivalent passive circuit parameter of an MMC (modular multilevel converter) on an inverter side; (2) calculating an admittance matrix of a whole direct-current line; (3) solving an equation of a direct-current network to obtain voltage of a few key nodes of the direct-current network; (4) solving the direct-current loop impedance. The calculation method for the direct-current loop impedance can make up design and research blanks of a direct-current main loop of an existing hybrid bipolar direct-current transmission system and achieve a certain guiding function for the design of future engineering, in view of the fact that time-domain simulation consumes time and calculation resources, the calculation method for the direct-current loop impedance is based on an equivalent analytical method on the premise of ensuring effectiveness, and calculation efficiency can be improved, so that time consumed by the design of the direct-current main loop can be shortened.

The invention provides a method and device for extracting parasitic inductances of IGBT modules. The method comprises the following steps of: establishing an impedance equivalent model of an IGBT module; obtaining an end impedance of each branch in the impedance equivalent module; and calculating a parasitic inductance of the IGBT module according to the end impedances. According to the method anddevice, the impedance equivalent model corresponding to the IGBT module is established according to characteristics of each circuit in the IGBT module, the end impedance of each branch in the impedance equivalent module is obtained through an experiment measurement manner, the parasitic inductance of each branch is calculated according to the end impedance of each branch and internal inductance distribution condition of the IGBT module, and finally the parasitic inductance of the whole IGBT module is obtained. Compared with the prior art, the method and device have the advantage that the extraction of parasitic inductance parameters is separately divided so that the inconvenience of data analysis due to setting the parasitic parameters into lumped parameters is avoided and more correct data reference is provided for the packaging design of the IGBT module.

A matrix converter system having a current control mode operation is provided. The system includes a matrix converter having a switching matrix. The matrix converter is coupled at its low-voltage side to a generator and at its output load side to a load. A controller having a pulse width modulation (PWM) control circuit is configured to control the matrix converter via its switching matrix to increase energy within the internal inductances of the generator when the switching matrix causes a short circuit. A feed forward calculator is configured to calculate a feed forward output phase angle. The feed forward output phase angle is an estimation of an angle between an output current vector and an output voltage vector that represent feedback signals of current and voltage output by the matrix converter. The angular position of the voltage output vector is adjusted as a function of the feed forward output phase angle to align angular position or phase angle of the voltage output vector that represents the voltage output with a selected angular position or phase angle.

The invention discloses an integrated circuit built-in inductance and a method of production thereof. The inductance comprises a substrate, an isolating layer, a lower metal layer, an interlaminar medium layer and a spiral upper metal layer, wherein the lower metal layer and the interlaminar medium layer are located on the surface of the isolating layer, the spiral upper metal layer is located on the surface of the interlaminar medium layer, and the interlaminar medium layer is internally equipped with a through hole for connecting the lower metal layer and the upper metal layer. In addition, the inductance further comprises a well layer which is located in the substrate and has the doping type opposite to that of the substrate, and the well layer enables a PN junction to be longitudinally formed in the substrate of the integrated circuit built-in inductance, thereby effectively increasing the Q value of the inductance. The invention further provides a method of production corresponding to the integrated circuit built-in inductance, which can be combined with the process of integrated circuits without additional processes, thereby the method is simple and convenient to realize.

The invention provides an integrated circuit. The integrated circuit comprises a packaging substrate; an interposer packaged on the packaging substrate, wherein a metal interconnection line and an inductance coil are formed in the interposer; and a chip packaged on the interposer. The metal interconnection line is arranged in at least one of the following modes: the metal interconnection line is electrically connected the chip and the packaging substrate; and the metal interconnection line is electrically connecting the chips with one another. The inductance coil does not change the electric connection between the chip and the packaging substrate below, and the inductance coil is arranged in the interposer, so that a middle-level internal inductor which is controllable in inductance value L and quality factor Q and meets the requirement can be realized, the bandwidth loss caused by the link and the solder balls on the whole signal link can be eliminated, and the bandwidth optimization is realized, so that the performance of the whole communication link can be improved.

The invention relates to a fabric sensor design method and a fabric respiration measuring device. The fabric sensor design method includes the following steps that (1) self-inductance of silver-plated conductive yarns is composed of internal inductance and external inductance; (2) the magnetic field intensity and the magnetic induction intensity of the position which is x away from the axis of the silver-plated conductive yarns are obtained; (3) an area with the width being dx and the length being 1 is obtained in the position which is x away from the axis of the silver-plated conductive yarns, and the magnetic flux and the magnetic flux linkage are obtained; (4) the total magnetic flux linkage of the interior of the silver-plated conductive yarns is obtained; (5) the internal inductance per unit length of the silver-plated conductive yarns is obtained; (6) a point P (x, y) is selected randomly outside the silver-plated conductive yarns, and the magnetic induction intensity of the silver-plated conductive yarns at the point P (x, y); (7) the total magnetic flux linkage of the exterior of the silver-plated conductive yarns is obtained; (8) the external inductance per unit length of the silver-plated conductive yarns is obtained; (9) the inductance per unit length of the silver-plated conductive yarns is obtained; and (10) the fact that the inductance of the silver-plated conductive yarns is related to the position of the silver-plated conductive yarns is known, and then respiration signals and the respiration rate are obtained indirectly. The fabric sensor design method and the fabric respiration measuring device are suitable for monitoring of the respiration signals and the respiration rate in daily life and exercise state.

The invention discloses a new energy-saving distribution box, which comprises a cabinet body, a lock, a lock body, an alarm, an inductance, a capacitor, a display screen, an inductance coil and a foot pad. The cabinet body is provided with a card slot, and the cabinet body There is a loose leaf on the left side of the body, the door body is connected to the loose leaf, and the door body is provided with a gasket, the lock is fixed on the left side of the door body, and the remote control device is provided with a controller on the right side. The inductor is fixed under the cabinet, and a sealing device is arranged outside the inductor, the capacitor is set on the right side of the inductor, the display screen is embedded inside the door, the inductor coil is set inside the inductor, and the inductor coil is provided with an inductor line, and the foot pad is arranged at the lower part of the cabinet. The new energy-saving power distribution box is mainly designed for power distribution. A display screen is set on the front of the device, which can better display the power consumption of the mains power and power-saving mode, and can better let people Know the status of electricity usage.

The invention discloses a two-phase air-core compensation pulse generator and a method for realizing pulse discharge thereof, relates to an air-core compensation pulse generator and a method for realizing pulse discharge thereof, and aims to solve the problem that the rotating speed of the conventional air-core compensation pulse generator is limited by the pulse width of output current. Stator armature windings adopt a two-phase structure, the electrical angles of the two-phase windings are orthogonally arranged, each phase of output current is relatively independent, pulse current is outputto a load after parallel superposition of respective rectifiers, and the pulse width is no longer limited by the half cycle of the motor; during discharging, the excitation winding induces current tocompensate the armature winding, the internal inductance of the motor is reduced, and the amplitude of pulse current is improved; through controlling a trigger angle, a free component of a load current is eliminated, and an ideal trapezoidal wave pulse current is output. The invention is used for outputting pulse current.

A driver circuit is described for an ion measuring device associated with a cylinder of a diesel engine for the measurement of the conductivity of the combustion gas present in the cylinder, wherein a negative voltage can be applied by the driver circuit to a glow plug serving as a sensor and associated with the cylinder for a respective ion measurement. The negative voltage is generated by a capacitor which is correspondingly charged each time the glow plug is switched off via the magnetic energy stored in the internal inductance of the glow plug.

A notched SAW image frequency rejection filter system includes a SAW filter having an input, an output and a ground output and an impedance matching network including a first matching inductance connected to the SAW filter output and a second matching inductance connected to the ground output of the SAW filter; the SAW filter having an inherent internal capacitance that produces a predetermined capacitive leakage current at the image frequency; an inherent internal inductance that produces an inductance leakage current at the image frequency; and a boosted inherent parasitic ground inductance at the ground output of the SAW filter for generating a voltage across the second matching inductance to produce a compensation current which is substantially opposite in phase and substantially matched in magnitude with the capacitive leakage current for reducing the capacitive leakage current and increasing the image frequency rejection.

The invention discloses a large-current combined high-temperature inductor and a processing method thereof. The whole inductor is formed by bonding and combining an inductance magnet and an inductanceconductor. The inductance magnet comprises an external inductance magnet and at least one internal inductance magnet; the external inductance magnet is integrally formed, at least one conductor containing groove used for containing the inductance conductors is formed in the external inductance magnet in a penetrating mode, one inductance conductor is arranged in each conductor containing groove,and the remaining space in each inductance conductor and the remaining space in the corresponding conductor containing groove are filled with one internal inductance magnet. Effective integration of the inductor is achieved, the overall shape of the inductor is regular, pins on the inductor are all arranged on the outer surface of the same side of an inductor finished product, the shielding performance of the inductor is guaranteed, the overall size and occupied space of the inductor are reduced, and convenience is provided for subsequent installation and use of the inductor.

The invention discloses an office chair device, which comprises a bottom side plate and a top side plate. The upper surface of the bottom side plate is provided with a casing fixedly installed on both sides corresponding to it, and an iron Rod, the side of the iron rod is fixed inside the inductor, the casing is provided with a main body hollow groove directly above the iron rod, a magnetic body is placed inside the main body hollow groove, and the magnetic shape A sliding plate is placed on the upper surface of the body, and a first push rod is fixed on the top of the upper surface of the sliding plate.

A power supply apparatus for induction heating is provided. The power supply apparatus includes a smoothing filter configured to smooth a pulsating current of DC power output from a DC power supply, and an inverter configured to convert the DC power that has been smoothed by the smoothing filter into AC power. The smoothing filter includes a plurality of capacitors having different internal inductances and connected to each other in parallel between input terminals of the inverter, each of the capacitors being connected to the input terminals of the inverter directly or through a pair of bus bars. The plurality of capacitors includes a first capacitor and a second capacitor, the first capacitor having smaller internal inductance than the second capacitor and a shorter conductive path between the input terminals of the inverter than the second capacitor.

An integral dual frequency by-pass and transient suppressor device has at least two ceramic semiconductor layers, the upper surfaces of which are formed with electrodes of generally U-shaped configuration. The base portions of the electrodes are exposed at opposite surfaces of the semiconductor layers, the leg portions of the U-shaped electrodes extending toward the base portions of electrodes of opposite polarity. The overlap or registration area of one pair of legs differs from the overlap area of the other leg pair with the result that two capacitors of different values are formed, the capacitors being in parallel and accordingly defining a low impedance path at two discrete frequencies. By varying the conductive paths as a function of the length of the electrode and / or the base of the U, a desired internal inductance is developed. Use of a semiconductor material in place of a dielectric provides transient energy suppression by shunting to ground any signal introduced to the device at a level at or above the breakdown voltage of the semiconductor.

The invention relates to an ultra-high-speed integrated motor whose internal inductance can be adjusted steplessly, and belongs to the technical field of motors. In the present invention, a set of stator and rotor of a reactor is added outside the normal stator teeth, coils are wound on the stator teeth of the reactor, and fixed on the stator of the motor, the rotor is fixed on the casing and can slide back and forth through push buttons outside the casing, thereby To adjust the coupling area between the stator teeth of the reactor and the rotor teeth, and further change the magnetic permeability of the magnetic circuit, the internal inductance can be adjusted steplessly, so that the inductance value can be adjusted to adapt to different working conditions, thus The working system of the motor is simplified, and the working efficiency of the motor is improved. Compared with the traditional method of limiting the current of the motor stator winding by an external series reactor, the series inductor of the present invention can adjust the inductance value arbitrarily and the adjustment range is wide enough. On the basis of ensuring the safety of the motor, it also has the advantages of being more flexible and more adaptable to the complex and changeable working conditions of the motor.

A compensating inductor energy storage generator comprises a motor unit and a rectifying circuit. The motor unit comprises an armature winding, an exciting winding and a compensating winding. The rectifying circuit comprises a plurality of diodes. The armature winding is electrically connected with the compensating winding and a load through the diodes, and the exciting winding is connected to the two ends of the compensating winding in parallel. When the motor unit carries out instantaneous discharge on the load, the compensating winding provides compensating currents, so that a varying magnetic field is generated and interacts with a reaction magnetic field of the armature winding, equivalent instantaneous internal inductance of the motor unit is reduced, and the capacity of the motor unit for outputting power instantaneously is improved.

The invention discloses a high voltage pulse capacitor which comprises an energy storage unit, a sealed housing and an inserting electrode structure. The energy storage unit is formed by the series connection of a plurality of energy storage elements and is in the sealed housing. An electrode in the inserting electrode structure goes through two ends of the sealed housing and the energy storage unit to be connected. The geometric symmetry layout design of an even number of elements, an embedded copper foil low temperature welding method, an overall housing sealing process and touch finger inserting structure are used, and the high voltage pulse capacitor has the technical effect of large discharge current, internal inductance, small internal resistance and a long service life.

The invention relates to an ultra-high-speed integrated motor with internal inductance capable of being steplessly adjusted, and belongs to the technical field of motors. According to the invention, astator and a rotor of a set of electric reactor are additionally arranged outside normal stator teeth, coils are wound on the stator teeth of the electric reactors and fixed on the motor stator, andthe rotor is fixed on a shell and can slide back and forth through a push button outside the shell, so that the coupling area between the stator teeth and the rotor teeth of the electric reactor is adjusted so as to further change the magnetic conductivity of a magnetic circuit, and stepless adjustment of the internal inductance is realized so as to adapt different working conditions by adjustingthe inductance value, simplify the working system of the motor and improve the working efficiency of the motor; compared with the traditional mode of limiting the motor stator winding current by an external series reactor, the series inductor provided by the invention has the advantages that the inductance value can be randomly adjusted, and the adjustment range is wide enough; and on the basis ofensuring the working safety of the motor, the ultra-high-speed integrated motor has the advantages of being more flexible and more suitable for complex and changeable working conditions of the motor.