42results about How to "Consistent impedance" patented technology

The present disclosure relates to a touch panel having a shielding structure and a method of manufacturing the same. The touch panel having a shielding structure comprises a conductive ring disposed on periphery of an upper surface of a substrate, a shielding layer disposed on a lower surface of the substrate, and a plurality of conductive connection points electrically connecting the shielding layer and the conductive ring. By connecting the shielding layer and the conductive ring by the conductive connection points, impedance of the shielding layer is consistent for different distances between the shielding layer and flexible printed circuit, thereby eliminating noise interference from a liquid crystal display or an electronic device under the touch panel, while using the touch panel. Moreover, the manufacturing method of the touch panel with a shielding structure is a simple process, which reduces the manufacturing cost.

The invention discloses an improved alternative current-alternative current frequency converter system through utilization of a phase-shifting transformer. The system comprises a power grid and a three-phase alternative current-alternative current frequency converter connected with the power grid. The power grid is connected with one output phase of the three-phase alternative current-alternative current frequency converter through a common three-winding transformer, and the power grid is connected with another two phases of the three-phase alternative current-alternative current frequency converter through the phase-shifting transformer. The alternative current-alternative current frequency converter system can further reduce total harmonic distortion (THD) of input current, improves quality of electric energy between the power grid and a production field of an industrial enterprise, and has the advantages of being simple in implementation method, and low in cost.

The invention discloses an EMI-filter-based electromagnetic interference noise measuring and suppressing system. The system comprises a linear impedance stabilization network, a signal selection module, a noise amplification module, a filter module, an A/D sampling module, a central control module and a serial port communication module, wherein an extraction signal output end of the linear impedance stabilization network passes through the signal selection module and is input into the input end of the noise amplification module; the output end of the noise amplification module sequentially passes through the filter module and the A/D sampling module and is in two-way connection with the central control module; the central control module communicates with an upper computer by virtue of the serial port communication module; the signal selection module comprises a noise separation circuit and an external relay normally-closed contact K1-1, a relay normally-opened contact K1-2 and a relay normally-opened contact K2-1; the relay normally-closed contact K1-1 and the relay normally-opened contact K1-2 serve as mutually reverse action contacts. The EMI-filter-based electromagnetic interference noise measuring and suppressing system has the advantages that the data can be sampled and regulated, the noise modal is quickly and accurately separated, the external interference is resisted, and the interference of the system on other devices can be simultaneously suppressed.

Provided is a transmission device for a near field communication device and a near field communication device. The transmission device comprises a matching circuit, a connection interface, a first transmission line, and a second transmission line. The connection interface is used for being connected with an operation circuit of the near field communication device and is provided with a first width. The first transmission line is electrically connected between an antenna and the matching circuit of the near field communication device. The second transmission line is electrically connected between the connection interface and the matching circuit and comprises a line width gradually-increasing segment and an equal line width segment. The width of the line width gradually-increasing segment of the second transmission line is gradually increased from the first width to a second width. The width of the equal line width segment of the second transmission line is approximately the second width. The second width is more than the first width and is related to first width. According to the transmission device, impedance between the transmission device and the antenna is consistent and noise between the transmission device and the operation circuit is reduced such that high-frequency signal transmission loss is decreased and transmission efficiency is improved.

The invention discloses a difference wiring method for a high-speed printed circuit board. The difference wiring method comprises the following steps: setting a preset impendence required value in a non-BGA region to be Z2, and determining a second difference line width w2 and a distance d2 between the second difference lines according to the preset impendence required value Z2; calculating a first difference line width w1 and a distance d1 between the first difference lines according to a distance s1 between adjacent two lines of bonding pads in a BAG region bonding pad array, and a minimum processing distance s2 from the bonding pad to the first difference lines, wherein w1 and d1 satisfy the inequation that the 2w1+d1 is less than or equal to s1-2s2; meanwhile, further calculating the w1 and d1 according to a difference characteristic impendence formula; arranging two first difference lines that are arranged in opposite in the BGA region according to the determined d1; arranging two second difference lines that are arranged in opposite in the non-BGA region according to the determined d2; connecting the first difference lines and the corresponding second difference lines through a first connecting line; and connecting the first difference lines and the corresponding first bonding pads through a second connecting line.

The invention discloses a concentric type axial four-division traction transformer and a realization method thereof, wherein a full-division structure that four primary windings of a transformer respectively correspond to a secondary winding is adopted; a three-phase concentric type axial four-division traction transformer is provided with 12 primary windings and 12 secondary windings; and all the primary windings and the secondary windings are axially arranged. The transformer has the following characteristics that firstly, as the four windings are in the full-division structure, the influence among each secondary winding is relatively small, the decoupling performance is relatively good, and each secondary winding can work independently as well as can work synchronously; secondly, the transformer is suitable for being manufactured into a high-impedance transformer which plays significant roles on limiting short-circuit currents, eliminating resonance and filtering; thirdly, compared with four separate transformers or two double-division transformers, the concentric type axial four-division traction transformer has the advantages of small size, small occupied space and low manufacturing cost.

The invention relates to a circuit board, a preparation method thereof and a display panel. The circuit board comprises an insulating layer, a reference layer and a signal transmission layer, wherein the insulating layer comprises a first surface and a second surface which are opposite to each other; the reference layer is arranged on one side of the first surface, the reference layer comprises a latticed conductor formed by a plurality of first lattice units, and the first lattice units are symmetrical structure units with a first symmetry axis; the signal transmission layer is arranged on one side of the second surface, the signal transmission layer comprises a plurality of groups of differential line pairs, each group of differential line pairs comprises two differential lines parallel to the first symmetric axis, and the two differential lines are symmetric about the orthographic projection of part of the first symmetric axis on the signal transmission layer. The two differential lines of each group of differential line pairs of the circuit board are symmetrically distributed relative to the corresponding first symmetric axis, so the impedance consistency of the differential lines is ensured, the noise of the differential lines during signal uploading is reduced, and the signal transmission quality is further ensured.

The invention provides a touch control display substrate, a touch control display panel and a touch control display device. The touch control display substrate comprises a substrate body,a plurality of first touch control sensing blocks and aplurality of second touch control sensing blocks, wherein first touch control electrode wires are arranged in the first touch control sensing blocks; the second touch control sensing blocks are arranged at the edge of the display area in an array mode and arranged on the outer sides of the first touch control sensing blocks, and second touch control electrode wires are arranged in the second touch control sensing blocks; the area of each first touch control sensing block is larger than that of each second touch control sensing block, and the range of the ratio of the area of each second touch control electrode wire to the area of each first touch control electrode wire is 0.9-1.1. According to the touch control display substrate, the ratio of the area of the second touch control electrode wires in the second touch control sensing block to the area of the first touch control electrode wires in the first touch control sensing block is controlledwithin a small difference range, and therefore the uniformity of the touch control performance of the touch control display substrate is improved.

The invention relates to a device for processing one-drive-two circuit signal and a circuit thereof. The device of one-drive-two circuit comprises a first connection end, a second connection end and a third connection end which are respectively used for connecting a first transmission line, a second transmission line and a third transmission line; the first connection end, the second connection end and the third connection end are respectively connected with at least one resistor; the resistors connected with the second connection end and the third connection end are connected in a parallel way; the resistors connected with the first connection end are connected with the resistors connected with the second connection end and the third connection end in a serial way; the total impedance among the device and the second transmission line and the third transmission line is equal to the impedance of the first transmission line. The one-drive-two circuit is provided with the devices, thereby ensuring the impedance on the transmission path of the one-drive-two circuit to be continuous and matched, eliminating multi-reflection of high-speed signals and greatly optimizing the signals received by a receiving end.

The invention relates to the technical field of electromagnetism, and particularly discloses a bounded wave simulator, which comprises a pulse source, and a first transition region, a transmission region and a second transition region which are sequentially arranged along the pulse signal transmission direction of the pulse source, wherein the first transition region comprises a first flat plate and a second flat plate which are symmetrically arranged along the horizontal plane. The first flat plate and the second flat plate form a conical structure with an opening facing the transmission area; the transmission area comprises a third flat plate and a fourth flat plate which are horizontally arranged; the second transition area comprises a first wire grid array and a second wire grid arraywhich are asymmetrically arranged along the horizontal plane, the first wire grid array and the second wire grid array form a conical structure with an opening facing the transmission area, the firstwire grid array and the second wire grid array each comprise a plurality of metal wire grids connected in parallel, and each metal wire grid is provided with a distributed load. The leakage of electromagnetic energy in the first transition area and the transmission area can be reduced, and the energy output efficiency of the pulse source and the matching absorption effect of the load are improved.

The invention relates to the technical field of communication, and discloses a radio-frequency connector joint and a radio-frequency connector. The radio-frequency connector joint comprises an inner conductor, an insulator and an outer conductor; the insulator is clamped on the outer conductor, and the inner conductor is connected to the insulator, so that the inner conductor is fixed; a first inserting part is arranged at the right end of the inner conductor; a second inserting part is arranged at the right end of the outer conductor; the first inserting part and the second inserting part arecoaxial; when the radio-frequency connector joint and a coaxial cable are installed, a user can quickly insert an inner conductor layer and an outer conductor layer of the coaxial cable into the first inserting part and the second inserting part to insert the coaxial cable into the radio-frequency connector joint, so that the coaxial cable can be firmly connected to the radio-frequency connectorjoint; and the connecting position is enabled to be the same during each installation to ensure that the impedance is kept consistent when the radio-frequency connector joint and the coaxial cable areinstalled each time, so that the accuracy of antenna testing is improved.

The invention discloses a digital E1 hardware interface cascade configurable implementation device and method. The device comprises two hardware circuit board cards, a board card I comprises a to-be-tested module access unit and a communication link distribution unit, a board card II is a main control unit and an external communication adapter interface, and a connector of the board card I and a connector of the board card II are interconnected; the to-be-tested module access unit provides a power supply and an excitation signal required by work for a to-be-tested module, and leads out a to-be-tested signal of the to-be-tested module; the communication link distribution unit realizes path selection through a plurality of analog switch chipsets; variable cascade loop distribution in eight channels is completed in the communication link distribution unit; the main control unit takes an FPGA (Field Programmable Gate Array) or an MCU (Microprogrammed Control Unit) as a main processor and comprises an external input part, an external display part and an analog switch channel distribution part. The error probability is reduced, and the production test efficiency is improved; by operating the main control unit, the multi-module and multi-cascade test mode requirements can be quickly realized.

The invention relates to the notebook computer field and particularly relates to a notebook computer touch board connection structure. The notebook computer touch board connection structure comprises a main circuit board A and a touch board B, wherein one end of the main circuit board A is fixed with a first board block, one end of the touch board B is fixed with a second board block, the surface of the first board block is provided with a first circuit, the surface of the second board block is provided with a second circuit, the first circuit is electrically connected with the main circuit board A, the second circuit is electrically connected with the touch board B, side face portions of the first circuit and the second circuit are close to each other, the first board block and the second board block realizes sliding groove sliding block matching, and a limit block capable of limiting random sliding of the two board blocks is arranged in the sliding direction of the two board blocks. The occupation space of the first board block and the second board block is only a small part of the matching area of the two, on the one hand, other parts in a notebook computer are conveniently arranged, on the other hand, heat radiation and ventilation around the area are facilitated, two parts are simple to assemble, and assembly efficiency is improved.

A printed circuit board comprises at least one testing interface. The testing interface comprises a plurality of pins. Each pin is connected with a terminal resistor through a testing point. The distances between the legs and corresponding testing points are same. According to the printed circuit board, circular testing points and cement terminal resistors are used; and in testing, discharging of a static gun is utilized for realizing smoother receiving energy of the printed circuit board. Furthermore a testing result influence caused by gap discharging can be prevented. Testing accuracy and testing stability can be effectively improved.

The invention discloses a partition testing system for detecting current and temperature distribution of a fuel cell, belongs to the field of fuel cell testing, and particularly relates to the field of testing of current and temperature distribution of a fuel cell stack. According to the invention, the acquisition board adopts an equal-impedance wiring mode, so the impedance from each partition tothe sampling resistor is consistent as much as possible; the sampling resistor is arranged outside the acquisition plate, a resistor burying process is not needed, the cost is low and the implementation is simple; the temperature-sensitive resistor is placed on the printed circuit board instead of being buried in the flow channel, so the damage of the temperature measuring element to the structure of the fuel cell is eliminated, and the reaction in the cell is not influenced; online high-density matrix type partition current and temperature distribution measurement can be realized, real-timeimaging is performed on data, and partition current distribution and temperature characteristics are visually displayed. The system can be used for a high-speed acquisition scene, and has important significance for researching the dynamic characteristics of the fuel cell.