157results about How to "Reduce the inductance value" patented technology

The invention discloses a configurable multi-mode multi-band satellite navigation receiving method and a radio frequency front end module constructed by the method. The front end module can receive signals of satellite navigation and positioning systems such as a global positioning system (GPS), the Big Dipper, a Galileo positioning system and a global navigation satellite system (Glonass), and comprises a configurable low-noise amplifier (LNA) with a buffer and an active balun, a folding passive mixer with a configurable frequency synthesizer, a configurable multi-mode filter, an automatic gain control (AGC) amplifier, a direct-current bias circuit, and a multi-mode multi-band program controlled and coded on-off control word from a receiving system. The radio frequency front end module can meet the requirement of multi-band multi-mode work through the control word programmed by the receiving system, has a simple and reliable structure, does not need complicated time division multiplexing control system and off-chip module, has low cost and high flexibility, and improves the noise performance of the radio frequency front end of the whole receiver and multi-mode multi-band signal processing capacity; and a one-channel signal is input into the module, and the module outputs a two-channel differential signal. The receiver can be used for receiving and processing multi-mode satellite navigation signals asynchronously, and receiving and processing satellite navigation signals with the required mode in different time intervals according to the requirement.

Placing inductors or resistors in parallel causes the combined value of inductance or resistance to decrease according to the parallel combination rule. This invention decreases the parasitic resistance of an inductor by placing several inductors in parallel. Furthermore, by careful placement of these inductors, the mutual inductance between these inductors can be used to increase the equivalent inductance value to a value near that of the original inductance value of a single inductor. Thus, it is possible to create an inductance with a much lower value of parasitic resistance. This invention allows the formation of high Q inductors and would be beneficial in any circuit design requiring inductances. Another aspect of this invention is that the coils can be partitioned to minimize eddy current losses. This invention can easily be implemented in a planar technology. Simulations of several tank circuits indicate that the power dissipation can be reduced 3 to 4 times when compared to conventional techniques.

The invention provides a production method of a high-power precision alloy SMD (surface mount device) resistor. The production method comprises the steps: respectively combining two oxygen-free copper strips with two sides of a resistor alloy strip to form an integrated strip-shaped resistor strip, and wrapping a high-heat-conductivity substrate with the integrated strip-shaped resistor strip; etching a basic resistor structure on a wrapping body; precisely adjusting the resistance value of the basic resistance structure; coating, terminal electroplating and printing a resistor body to form a high-power precision alloy SMD resistor. The material with high heat radiation capability and high heat conductivity such as a metal substrate, a high-heat-conductivity ceramic substrate is used as the substrate, so that the actual load capacity of the resistor is greatly increased; the oxygen-free copper strip is partially arranged on the side surface and below the substrate and used as an electrode lead, so that the contact area is increased, and the heat conductivity of the resistor body is also increased on the other hand.

The present invention provides a monolithic inductor developed using radio frequency micro electromechanical (RF MEMS) techniques. In a particular embodiment of the present invention, a tunable radio frequency microelectromechanical inductor includes a coplanar waveguide and a direct current actuatable contact switch positioned to vary the effective width of a narrow inductive section of the center conductor of the CPW line upon actuation the DC contact switch. In a specific embodiment of the present invention, the direct current actuatable contact switch is a diamond air-bridge integrated on an alumina substrate to realize an RF switch in the CPW and microstrip topology.

The invention provides a defrosting system which includes an RF signal source, an electrode proximate to a cavity within which a load to be defrosted is positioned, a transmission path between the RFsignal source and the electrode, and an impedance matching network electrically coupled along the transmission path between the output of the RF signal source and the electrode. The system also includes power detection circuitry coupled to the transmission path and configured to detect reflected signal power along the transmission path. A system controller is configured to modify, based on the reflected signal power, an inductance value of the impedance matching network to reduce a ratio of the reflected signal power to the forward signal power. The impedance matching network includes a plurality of fixed-value, lumped inductors positioned within a fixed inductor area.

Disclosed is an open magnetic circuit stacked coil component that is less likely to cause defects between a nonmagnetic layer and a magnetic layer, causes no significant deterioration in temperature characteristics of inductance, even when the thickness of the nonmagnetic layer is reduced, and has excellent direct-current superimposition characteristics. An open magnetic circuit stacked coil component (1) comprises a laminate (11), formed of magnetic layers (2) stacked on top of each other, a coil (L) provided within the laminate (11), and a nonmagnetic layer (4) provided within the laminate (11) so as to cross a magnetic path formed by energization of the coil (L). The nonmagnetic layer is formed of a nonmagnetic material of a Zn-Cu-based ferrite. The magnetic layer is formed of a magnetic material. The magnetic material comprises 100 parts by weight of an Ni-Zn-Cu-based magnetic ferrite material and 0.1 to 2.0 parts by weight, in terms of Co3O4, of Co added to the Ni-Zn-Cu-based magnetic ferrite material. According to the above constitution, the difference in firing shrinkage between the magnetic layer and the nonmagnetic layer can be reduced to suppress the occurrence of cracks and the like, and, even when Ni is diffused from the magnetic layer to thenonmagnetic layer upon firing, the temperature characteristics of the inductance are rendered flat.

A laminated inductor, in which there is extremely little tendency for cracking to occur between adjacent conductor patterns in portions of a laminate in the lamination direction even when the conductor pattern thickness is large, as well as a method of manufacturing such a laminated inductor, are provided.

A laminated inductor includes: a laminate; a pair of external electrodes arranged on the outer surfaces of the laminate respectively; and a coil, arranged within the laminate and formed by electrically connecting a plurality of strip-like conductor patterns. The conductor patterns have: a pair of broad faces, intersecting the lamination direction and mutually opposing; and peripheral side faces adjacent to the pair of broad faces and extending in the lamination direction. The peripheral side faces are concavo-convex faces, in which concave portions and convex portions are arranged in alternation in the lamination direction. The laminate enters into the concave portions of the peripheral side faces.

The invention discloses a single-phase single-stage current type photovoltaic grid inverter and a control method thereof, the single-phase single-stage current type photovoltaic grid inverter is composed of a direct current (DC) side capacitor C, a current transforming module and an output filter; the DC side capacitor C is connected to a photovoltaic battery; the current transforming module is composed of a direct current inductance L and five reverse blocking power switches, namely SWL(Safe Working Load), SWP1, SWp(Safe Working Pressure)2, SWn(Switching Network)1and SWn2, respectively, the output filter is formed by connecting a capacitor Cf (Cross fire) and an inductance Lf (Low frequency), the capacitor Cf is connected to two output ends of the current transforming module. According to the invention, the single-phase single-stage current type photovoltaic grid inverter is free of a transformer, with a boosting function, through the least power inversion stage and the smallest passive element parameter.

The present invention relates to a semiconductor package and a method for making the same. The semiconductor package includes a substrate, a first passivation layer, a first metal layer, a second passivation layer, a second metal layer and a third metal layer. The substrate has a surface having at least one first pad and at least one second pad. The first passivation layer covers the surface of the substrate and exposes the first pad and the second pad. The first metal layer is formed on the first passivation layer and is electrically connected to the second pad. The second passivation layer is formed on the first metal layer and exposes the first pad and part of the first metal layer. The second metal layer is formed on the second passivation layer and is electrically connected to the first pad. The third metal layer is formed on the second passivation layer and is electrically connected to the first metal layer.

The invention discloses a step-up converter for high speed solenoid valve driving, which belongs to the field of high actuator driving. The step-up converter aims to overcome the shortcomings of a single-inductor step-up circuit and a flyback transformer, combines the advantages of a single-inductor step-up way and a flyback transformer step-up way, adopts a centre-tapped transformer as a step-up inductor, achieves improvements in step-up ratio, working frequency, inductor volume and working efficiency, and can reduce system cost and improve the level of integration; and a centre-tapped transformer step-up way combines the advantages of transformer step-up and inductor step-up, is particularly suitable for high voltage production for the high speed solenoid valve driving, and ensures an output voltage range of 80 to 150V.

The invention discloses a voltage-regulating variable-frequency hierarchical control ultrasonic plastic welding power supply, which comprises a sampling control unit, a rectifying and DC voltage-regulating unit, a fixed phase-shift angle inversion unit, a matching boosting isolating unit and an ultrasonic transducer. The sampling control unit comprises a microprocessor, a first signal conditioning circuit, a second signal conditioning circuit, a driving circuit, an effective value detection circuit and a phase detection circuit, wherein the first signal conditioning circuit and the driving circuit are connected with the microprocessor; the second signal conditioning circuit is respectively connected with the effective value detection circuit and the phase detection circuit; and the effective value detection circuit and the phase detection circuit are both connected with an AD sampling port of the microprocessor. The voltage-regulating variable-frequency hierarchical control ultrasonic plastic welding power supply has the advantages that output voltage and current waveform THD is small, the voltage-regulating range is wide, large-power ultrasonic welding can be realized, the voltage-regulating or power-regulating response is quick, the voltage ripple is small, the transducer has a small vibration amplitude fluctuation, the frequency tracking precision and the accuracy are high, the electric conversion efficiency is high and the like.

Placing inductors or resistors in parallel causes the combined value of inductance or resistance to decrease according to the parallel combination rule. This invention decreases the parasitic resistance of an inductor by placing several inductors in parallel. Furthermore, by careful placement of these inductors, the mutual inductance between these inductors can be used to increase the equivalent inductance value to a value near that of the original inductance value of a single inductor. Thus, it is possible to create an inductance with a much lower value of parasitic resistance. This invention allows the formation of high Q inductors and would be beneficial in any circuit design requiring inductances. Another aspect of this invention is that the coils can be partitioned to minimize eddy current losses. This invention can easily be implemented in a planar technology. Simulations of several tank circuits indicate that the power dissipation can be reduced 3 to 4 times when compared to conventional techniques.

An antenna amplifier, in particular for a magnetic resonance antenna, has a sheath wave barrier integrated into the signal path of the antenna amplifier in the form of a component designed exclusively for transfer of a differential signal.

The present invention relates to a novel rapid mechanical-type high-voltage direct current breaker. The breaker comprises a main fracture branch, a commutation branch, an energy-absorbing branch and acommutation charging branch. The commutation branch, the energy-absorbing branch and the main fracture branch are connected in parallel, two ends of the parallel circuit are connected in series in adirect current transmission circuit, the commutation branch comprises a power trigger electronic switch and a pre-charging capacitor, the power trigger electronic switch is connected in series in thepre-charging capacitor and then is connected in the direct current transmission circuit, the commutation charging branch is connected in parallel with the pre-charging capacitor in the commutation branch to charge the pre-charging capacitor, the main fracture branch comprises a mechanical switch and a saturation resistor, and the mechanical switch and the saturation resistor are connected in series and are connected in the direct current circuit. A transient current flowing through the saturation resistor is small prior to open-circuit fault current zero crossing to allow the saturation resistor to be worked in an unsaturated area, and inductance value is large, a rate of descent of a fault current prior to zero crossing is reduced, the reliability of an opening circuit is increased, and the cost of a device is reduced.