40results about How to "Reduce ground impedance" patented technology

The invention provides a thin film transistor liquid crystal display which comprises a first polarizer, an array substrate, a colored filter substrate, a second polarizer and conductive glue. The array substrate is located above the first polarizer, the colored filter substrate is opposite to the array substrate, a liquid crystal layer is clamped between the colored filter substrate and the array substrate, the second polarizer is located above the colored filter substrate, the side edge of the second polarizer is cut into a special shape, and the conductive glue is arranged between the second polarizer and the colored filter substrate in a coating mode. The side edge of the second polarizer, the side edge of the conductive glue and the side edge of the colored filter substrate further comprise silver glue which is electrically coupled with the second polarizer. Compared with the prior art, the side edge of the second polarizer is cut into the special shape such as a corrugated shape, so that the contact area of the conductive silver glue and the second polarizer is increased along with increasing of the length of a curve on the side edge of the second polarizer, smaller grounded impedance is obtained, and a more reliable electrostatic discharge path is formed.

The invention provides a heat-conducting bonding pad and a package structure of a QFP chip with the heat-conducting bonding pad. The heat-conducting bonding pad comprises a bonding pad region and a peripheral region, wherein the bonding pad region is provided with a plurality of bonding pad parts which are arranged in an array; and gaps are formed among the bonding pad parts. The bonding pad parts of the heat-conducting bonding pad are arranged in the array and are isolated from one another, and the area of the bonding pad parts is greatly reduced, so that, on one hand, the escape path of a gas generated by soldering flux pyrolysis in a solder paste in a high-temperature welding process is shortened; and on the other hand, the gaps between the adjacent bonding pad parts provide channels for escape of the gas; the gas can timely escape; the area and the quantity of bubbles are effectively reduced; the condition that the chip has enough heat radiating area is ensured; and the heat radiating effect is improved. Meanwhile, the effective area of a conductor formed by the bonding pad is increased, so that the grounding impedance of the chip is reduced; and the reliability of the chip is improved. The welding effect of the heat-conducting bonding pad is improved; and excessive floating of the chip is avoided, so that the welding reliability of peripheral pins is improved.

The invention discloses a novel fixing device and an assembling method for high-power radio frequency power amplifiers. The fixing device comprises a radiating base, a PCB (printed circuit board) board and a U-shaped piece. The PCB board is arranged tightly on the upper surface layer of the radiating base and provided with a center hole and a pair of fixing holes for connecting, a group of welding pads are arranged along the surrounding edge of the center hole; the central part of the U-shaped piece is an arc-shaped groove body, the upper two sides extend outward to form lugs respectively, each lug is provided with a fixing hole and is connected with the PCB board through an adjusting protection retaining part and a screw which penetrates through the fixing hole;a high-power radio frequency power amplifier is pressed on the radiating base by the central arc-shaped groove body of the U-shaped piece through downward pressure; and the U-shaped piece, the PCB board and the radiating base are connected by the screws or bolts which penetrate through the fixing holes on the lugs. By the assembling method, the high-power radio frequency power amplifiers can be assembled with low cost, good grounding and radiating of the radio frequency amplifiers can be guaranteed, performance consistency of the high-power radio frequency power amplifiers is improved, and production and assembly of the high-power radio frequency power amplifiers are facilitated.

The invention discloses a device and a method for fixing a power amplifier. The fixing device of the power amplifier comprises a fixing block, a PCB (Printed Circuit Board) and a radiator, wherein the fixing block comprises a body and a convex portion which is convexly arranged at the body, a top end of the convex portion is welded with the power amplifier, the PCB comprises a through hole in matching with the convex portion and a connection portion which is arranged at periphery of the through hole and is in grounding connection, the convex portion is inserted into the through hole, thickness of the PCB is equal to thickness of the convex portion, the body is in electrical connection with the connection portion, the fixing block is in grounding connection, and the radiator is connected with a bottom face of the body far from a top end of the convex portion and the PCB. According to the device and the method, manufacturing technology is simpler, an automation degree is higher, work reliability of the power amplifier is guaranteed while integral production cost reduction and product cost performance improvement are realized.

The invention provides a display device, which comprises a display panel, a circuit board and a conducting element, wherein the circuit board is arranged adjacently to the display panel and is electrically connected with the display panel; the circuit board comprises at least one conducting pattern which is arranged in a grounding region; the conducting pattern comprises a plurality of conducting parts which are arranged at intervals; the plurality of conducting parts are arranged along the first direction and the second direction respectively; the first direction is substantially vertical to the second direction; and the conducting element is arranged on the conducting pattern and is electrically connected with the conducting parts. By the display device, the grounding impedance of the conducting element and the grounding region can be reduced; and the lateral pushing stress-resistant strength of the conducting element can also be improved. Therefore, the problems that the conducting element is poor in contact or falls off can be solved, thereby improving the protection capability for electromagnetic interference and electrostatic discharge of the display device.

The invention provides a four-plus-one surge absorbing type grounding device comprising a current guiding grid and a ground potential limiter connected with the current guiding grid. The current guiding grid is formed by shunt electrodes, current-guiding anti-corrosion concrete belts and horizontal grounding bodies. Various current releasing channels for absorbing, consuming, and releasing are formed under the ground, so that resistive components and inductive components of the grounding system can be reduced simultaneously and total surge-to-ground releasing is realizing by means of absorbing one part, consuming one part, and discharging one part. The provided grounding device has advantages of low ground potential, simple design, convenient installation, accurate detection, reliable work and low manufacturing cost.

The invention belongs to a wireless communication system in an electronic and information field, in particular relating to an underground emergency searching and rescuing wireless communication system for transmitting signals by utilizing a rail. The underground emergency searching and rescuing wireless communication system for transmitting the signals by utilizing the rail does not need to rely on a transmission network possibly destroyed and can also ensure convenient moving and carrying under extreme conditions, such as mine accidents and the like, and can be used as a communication measure for searching and rescuing in an emergency. The wireless communication system is characterized in that an underwater rail is used as a carrier for transmitting electric signals. The wireless communication system adopts low-frequency or very low-frequency wireless electric signals with several kilometers of wave length and strong barrier penetrating ability and uses the rail as a wireless transmitting and receiving antenna so as to ensure that people trapped underwater can keep communication with people on the ground in an emergency. The invention provides a professional emergency searching and rescuing wireless communication system for people trapped underwater.

A fuel injection apparatus for an internal combustion engine having a plurality of cylinders is provided. The fuel injection apparatus includes a fuel injection valve and an in-cylinder pressure sensor disposed for each of the plurality of cylinders. The fuel injection valve injects fuel into a combustion chamber of each cylinder and the in-cylinder pressure sensor detects a pressure in the combustion chamber. The fuel injection apparatus includes a cylinder pair actuating circuit and a noise suppressing circuit. The cylinder pair actuating circuit is provided corresponding to a cylinder pair which is a combination of two cylinders included in the plurality of cylinders, for supplying actuating current to two actuating solenoids of the two fuel injection valves mounted on the cylinder pair. The noise suppressing circuit is provided between the cylinder pair actuating circuit and the actuating solenoids. The noise suppressing circuit includes two output terminals connected respectively to the two actuating solenoids of the two fuel injection valves. When actuating one of the two injection valves, the grounding impedance between the output terminal connected to the actuating solenoid of the other of the two injection valves and the ground, is reduced.

The invention relates to a method and a device for reducing the grounding impedance of a transformer substation grounding grid by additionally arranging a capacitor module. The device comprises a plurality of capacitor grounding devices, wherein each capacitor grounding device comprises a plurality of capacitor units, an epoxy resin cylinder, a damp-proof sealing ring, a connecting conductor and ametal disc; and the capacitor units are connected in series to operate, the capacitor units are wrapped by the epoxy resin cylinders, the connecting conductors are used for connecting the capacitor units and penetrating through the epoxy resin cylinders, sealing rubber pads are used at the joints of the connecting conductors and the upper ends and the lower ends of the epoxy resin cylinders, andthe metal discs are used at the tail ends of the capacitor grounding devices. According to the method and device, the inductance component proportion of the grounding impedance of the transformer substation grounding grid is measured by using a grounding impedance testing instrument, the specific inductance value of the transformer substation grounding grid is obtained, then the number of the required capacitor grounding devices is obtained, after simulation calculation verification, the corresponding number of capacitor grounding devices are welded to the transformer substation grounding gridto reduce the inductance component of the transformer substation grounding grid, and the effect of reducing the grounding impedance of the transformer substation grounding grid is achieved.

The invention provides a motor controller control panel which is suitable for a new energy vehicle, the motor controller control panel comprises at least four layers of PCBs, the surface layer and the bottom layer of the motor controller control panel are used for arranging signal lines of a motor controller, and the bottom layer of the motor controller control panel is used for arranging signal lines of the motor controller. The inner layer of the motor controller control board is used for arranging a power line and a ground line of the motor controller.

The invention provides a shielding piece and electronic equipment. Relates to the technical field of electronic equipment. The shielding member comprises a conductive metal film and an adhesive. Wherein the conductive metal film comprises a base body and conductive protrusions, the base body and the conductive protrusions are of an integrally-formed structure, and the conductive protrusions are arranged on at least one surface of the base body. The adhesive is arranged between every two adjacent conductive protrusions, the shielding part can be bonded to the structural part through the adhesive, and when the adhesive is bonded to the structural part, the conductive protrusions make contact with the structural part to conduct electricity, so that the shielding effect on the structural part is achieved. In addition, the base body and the conductive protrusions of the shielding piece are of an integrally-formed structure, impedance of the shielding piece can be reduced, and therefore the shielding effect of the shielding piece is improved.

The invention relates to the technical field of circuit boards, in particular to an FPC (Flexible Printed Circuit) steel sheet reinforcement optimization method. An FPC board and a steel sheet are included. The method comprises the following steps of S1, respectively forming via holes in the FPC board or the steel sheet; S2, arranging an activation layer on one surface of the steel sheet; S3, arranging an adhesive layer on the activation layer, and attaching the FPC board to the steel sheet; S4, carrying out surface cleaning on the via hole after lamination; and S5, arranging a soldering tin material on the via hole and carrying out curing treatment to realize soldering tin interconnection of the FPC board and the steel sheet. The invention also provides an FPC board steel sheet reinforcing structure. The invention provides the FPC steel sheet reinforcement optimization method and the FPC board steel sheet reinforcement structure. The FPC steel sheet reinforcing effect is achieved, theactivation layer is arranged on the steel sheet, and the surface is cleaned before tin soldering, so that the steel sheet and the FPC board can be conducted through tin soldering, the grounding impedance performance is improved, and the cost is greatly reduced.