44results about How to "Reduce inductive reactance" patented technology

The invention discloses a 5G communication 20GHz laser dual chip package base, which comprises a base body. A supporting member is arranged on the base body. A printed circuit board is arranged in the supporting member. A first laser chip and a second laser chip are arranged on the printed circuit board. The printed circuit board is printed with a hybrid microwave circuit with silver paste and a TEC circuit with Peltier paste. Two detectors PD for laser input current monitoring are mounted on the base body. The base body is also equipped with 50 ohm high-speed modulation electrical signal input pins, a detector PD input end pin, a TEC circuit input end pin and a ground output pin therein. The invention also discloses a preparation method thereof. According to the invention, the 40 GHz bandwidth for the single laser TO package is achieved. Thus, the cost is greatly reduced, the purpose of miniaturization is achieved, the compatibility with existing optical device standards is also achieved, and the popularity of the 5G network of high-speed optical devices is effectively promoted.

The present invention is related to a coplanar coupled-fed multiband antenna for the mobile communication device. The antenna mainly comprises a dielectric substrate, a ground plane located on one surface of the dielectric substrate, and a radiating portion, a shorting metal portion, and a feeding portion, which are all on the same surface of the dielectric substrate near one edge of the ground plane. One end of the shorting metal portion is connected to the radiating portion, and the other end is connected to the ground plane. The feeding portion comprises a first feeding metal portion and a second feeding metal portion. The first feeding metal portion has a feeding point for the antenna. One end of the second feeding metal portion is connected to the radiating portion, and there is a gap between the second feeding metal portion and the first feeding metal portion.

The invention discloses a novel lightweight electromagnetic self-piercing riveting gun. According to the riveting gun, a coil carrier is fixedly arranged at the bottom of a fixing plate; a rubber cushion pad is fixedly arranged on the fixing plate; a buffer block is fixedly arranged on the rubber cushion pad; a spring pressing block is fixedly arranged on the fixing plate; a guide cylinder is fixedly arranged on the spring pressing block; a connecting seat is fixedly arranged on the upper part of the guide cylinder; ring grooves are distributed in the lower part of the coil carrier in a ladderform; electrically-connected coils are shaped like rings corresponding to the ring grooves and are respectively fixedly arranged in the ring grooves; and guiding holes are formed in the fixing plateand the coil carrier. The riveting gun disclosed by the invention has that advantages that the structure is simplified; the manufacturing cost is reduced; the frequency and the magnitude of currents are increased; the forming force is increased; the shock absorption effect is obvious; the recoil force is remarkably reduced; the consistency of workpiece riveting is well guaranteed; and the rivetinggun is suitable for production lines for automatically connecting workpieces.

The invention belongs to the technical field of transient electromagnetic explorations and more particularly, to a coil for transient electromagnetic explorations and the application method thereof. The transmitting loops and the receiving loops are arranged on the same plane; among the transmission loops, among the receiving loops and among the transmission loops and the receiving loops, they all share the same central point. The turns of the transmission loops and the turns of the receiving loops are all arranged at some intervals; and the turns are all arranged in a spirally winding manner; and they are mutually embedded and sleeved. The numbers of the turns of the receiving loops are greater or equal to those of the transmitting loops. The turns of the transmitting loops can be either in series connection or in parallel connection; the turns of the receiving loops are in series connection only. The coil of the invention can be independently collected or released. And it is also portable. For the intervals among the receiving loops, under the condition that the number of the turns is a fixed one, it is possible to effectively reduce self-inductance and the distribution capacitance so as to shorten the transient process of the coil. In addition, as the transmitting loops and the receiving loops are mutually embedded and arranged at intervals. The mutual inductance coefficient of the two kinds of loops can be reduced so as to favorably obtain early effective signals, reduce the detection blind area in the shallow part, and improve the exploration in shallow layer, making the coil especially applicable to city engineering geophysical prospecting.

The invention belongs to the technical field of metal smelting, and particularly relates to an interior-rodlike and exterior-tubular type electroslag remelting device with double electrodes connectedin series and a method. The device comprises a consumable electrode connection flange plate, an interior-rodlike and exterior-tubular type consumable electrode, a cooling water circulation system, a power supply system, a consumable electrode lifting device, an electrode guide rod and a crystallizer. The consumable electrode connection flange plate comprises a consumable electrode connection flange plate inner column and a consumable electrode connection flange plate outer ring. The interior-rodlike and exterior-tubular type consumable electrode comprises the consumable electrode with the rodlike inner layer and the consumable electrode with the tubular outer layer. One end of the electrode guide rod is welded to the consumable electrode lifting device, and the other end of the electrode guide rod is welded to the consumable electrode connection flange plate. The cooling water circulation system is used for cooling the crystallizer. The positive electrode of the power supply system isconnected with the electrode guide rod, and the negative electrode of the power supply system is connected with the consumable electrode connection flange plate outer ring. According to the interior-rodlike and exterior-tubular type electroslag remelting device, due to the adoption of interior-rodlike and exterior-tubular type double-electrode serial connection, the length of short grids can be reduced, and the electrical efficiency and the quality of prepared steel ingots can be improved.

Electrical connectors and contacts for engaging printed circuit boards are disclosed. One preferred contact has a first contact leg, a second contact leg arranged in a substantially mirror relationship with the first contact leg, and a connecting member extending between and being integral with the first contact leg and the second contact leg. Each of the contact legs includes a mating portion for insertion into a circuit board through hole. The mating portions have an elastically deformable beam for imparting a normal force onto a wall of a circuit board through hole.

The invention belongs to the technical field of transient electromagnetic explorations and more particularly, to a coil for transient electromagnetic explorations and the application method thereof. The transmitting loops and the receiving loops are arranged on the same plane; among the transmission loops, among the receiving loops and among the transmission loops and the receiving loops, they all share the same central point. The turns of the transmission loops and the turns of the receiving loops are all arranged at some intervals; and the turns are all arranged in a spirally winding manner; and they are mutually embedded and sleeved. The numbers of the turns of the receiving loops are greater or equal to those of the transmitting loops. The turns of the transmitting loops can be either in series connection or in parallel connection; the turns of the receiving loops are in series connection only. The coil of the invention can be independently collected or released. And it is also portable. For the intervals among the receiving loops, under the condition that the number of the turns is a fixed one, it is possible to effectively reduce self-inductance and the distribution capacitance so as to shorten the transient process of the coil. In addition, as the transmitting loops and the receiving loops are mutually embedded and arranged at intervals. The mutual inductance coefficient of the two kinds of loops can be reduced so as to favorably obtain early effective signals, reduce the detection blind area in the shallow part, and improve the exploration in shallow layer, making the coil especially applicable to city engineering geophysical prospecting.

The related information of the transient zero sequence voltage and the transient zero sequence current caused by the fault are chosen as the reference for selecting the detective line and the subsection. The judgement is based on the components with the capacitive constraint relation in the transient zero sequence voltage and current caused by the fault. The defective line and the subsection are determined based on the reactive power and the direction in the transient signals. The invention is suitable to the system in which the neutral point is not connected to the ground, the arc-extinguishing coil is connected to the ground and the high-ohm resistor is connected to the ground. The invention possesses the features of no influence of the flash trouble and the self-determination without need of the defective information of other lines.

The invention discloses a connecting structure of a transformer and a current sensor. The structure comprises the transformer and the current sensor, wherein a transformer shell is provided with a tap bushing of the transformer; a ground terminal is arranged in the tap bushing; a current sensor shell is internally provided with a sensor core; the sensor core is provided with a feed-through hole; a conducting element is arranged in the feed-through hole; the current sensor is directly and fixedly connected with the tap bushing of the transformer through the current sensor shell; one end of theconducting element is connected with the ground terminal, while the other end is connected with the current sensor shell. The sensor realizes seamless connection in real sense on the ground terminal and the current sensor;as the ground terminal is directly connected with the ground conducting element in the sensor, the integral structure does not change the mode of bushing tap grounding and does not affect the normal operation of main equipment; as the ground conducting element is arranged inside the sensor, the integral structure greatly reduces the serial in of a field electromagnetic interference signal of the transformer, improves the signal to noise ratio for the sensor collecting signals, and establishes good foundation for lossless sampling of a current signal.

The invention relates to a housing of a wind-power tube bus that is installed in a wind power generation tower and is used for replacing a special cable for wind. The housing comprises a protection shell; and three positioning shell bodies are arranged in the protection shell, wherein the positioning shell bodies are in equilateral triangle shapes. The three positioning shell bodies are placed alternately and are fixed by a fixing device to form an isosceles trapezoid with the 60-degree base angles. Besides, the protection shell includes an upper shell body and a base plate; the upper shell body is in an isosceles trapezoid shape; and the shape size of the upper shell body cooperate with that of the isosceles trapezoid formed by the three positioning shell bodies. And the base plate has an arc structure.

The invention relates to a three-phase synchronous motor. A rotor winding and a stator winding of a motor are improved, and large-current and high-torque output is adopted during starting; once the work is stable, a low current is adopted for stable torque output; the stator winding achieves variable turns and positive and negative alternation of the magnetic field directions of the coils so as tobe matched with magnetic fields of magnetic steel with different magnetic poles on a rotor. The motor can save energy and electricity, is good in control performance, is low in temperature rise and is high in reliability.