26results about How to "Improving impedance" patented technology

A headset antenna and a connector for the same are provided. The headset antenna includes an audio signal line, an antenna and a high impedance element in specified application frequency ranges. The audio signal line is adapted for transmitting an audio signal and the antenna is adapted for receiving an RF signal. The high impedance element is disposed on a transmission path of the audio signal and generates a high impedance at a specified frequency band of the RF signal, so that the audio signal line is equivalent to an open circuit and the antenna obtains a better receiving capability.

The invention relates to a transformer area self-healing optimization control method and system based on flexible interconnection. The method comprises the following steps: S1, constructing an operation monitoring network based on equipment ledgers in a transformer area; s2, deploying flexible interconnection equipment at key nodes of a transformer area to realize fault isolation and power failure transfer, dynamic load transfer and voltage regulation, and flexible cooperative control of a distributed power supply and energy storage equipment; s3, introducing an equipment state evaluation model based on the transformer area operation data obtained by the operation monitoring network, and obtaining state evaluation and risk early warning of each equipment in the transformer area; s4, constructing a flexible interconnection dynamic topology management mechanism between the stations, and dynamically adjusting the interconnection topology between the stations according to the load transmission demand and the power supply condition; and S5, based on state evaluation and risk early warning of each device, performing load regulation and control and fault recovery according to a dynamic topology management mechanism of flexible interconnection. According to the invention, efficient and intelligent transformer area operation and power supply reliability improvement are realized.

The invention provides a composite solid electrolyte as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Specifically, the composite solid electrolyte is prepared from the following components in parts by weight: 10-20 parts of an inorganic solid electrolyte, 10-20 parts of polyethylene glycol, 10-20 parts of polyoxyethylene, 1-3 parts of a cross-linking agent, 10-20 parts of lithium salt and a plurality of solvents, wherein the cross-linking agent comprises an isocyanate compound. According to the invention, the cross-linking agent containing the isocyanate group, the inorganic solid electrolyte and the polyethylene glycol are subjected to nucleophilic addition reaction, so that the inorganic solid electrolyte is skillfully connected with the polyethylene glycol through chemical bonds, and an organic-inorganic interface is further optimized; the organic-inorganic composite solid electrolyte disclosed by the invention has good ion transport property and a relatively wide electrochemical window, and the cycle performance and the rate capability of a lithium battery can be effectively improved.

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl acetate, fluoroethylene carbonate, and 2,2-difluoroethyl ethyl carbonate; a lithium salt, including a first lithium salt comprising lithium hexafluorophosphate; and an additive, including a first additive comprising lithium difluorobis(oxalato)phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the electrolyte's high-voltage resistance and kinetic performance, reduce battery impedance, and enhance the battery's fast-charging performance and high-temperature cycle stability.

The utility model discloses a high-speed connector, which comprises an insulating seat, a plurality of signal terminals and a plurality of grounding terminals, the signal terminals and the grounding terminals are respectively inserted and fixed in a first terminal groove and a second terminal groove of the insulating seat, and each grounding terminal comprises a first grounding terminal, a second grounding terminal and a grounding sheet which are mutually independent. The first grounding terminal and the second grounding terminal are both inserted in the same second terminal groove, and the grounding sheet is also inserted and fixed in the second terminal groove, is embedded between the first grounding terminal and the second grounding terminal, respectively drives the first grounding terminal and the second grounding terminal to move outwards so as to be clamped and positioned with the inner wall of the second terminal groove, and enables the first grounding terminal and the second grounding terminal to be conducted; each first grounding terminal is provided with a first elastic guide connection arm and a first pin part; each second grounding terminal is provided with a second elastic guide connection arm and a second pin part; the first pin part and the second pin part both extend out of the lower end face of the insulating seat, and the first elastic guide connection arm and the second elastic guide connection arm are both exposed in a slot arranged at the upper end of the insulating seat.

The utility model discloses a female end shielding assembly which comprises an outer shielding piece, an inner shielding piece, an insulator and a contact assembly, the contact assembly is installed in the insulator, the right end of the insulator is installed in the inner shielding piece, the left end of the insulator is installed in the outer shielding piece, and the left end of the inner shielding piece is inserted in an inner cavity of the right end of the outer shielding piece. The left end of the inner shielding piece is an oval cavity, and the right end of the outer shielding piece is an oval cavity matched with the left end of the inner shielding piece. The beneficial effects of the utility model are that the left end of the inner shielding member is the elliptical cavity, and the right end of the outer shielding member is also the elliptical cavity, so that the sleeving area of the inner shielding member and the outer shielding member is in elliptical sleeving, the contact area of the inner shielding member and the outer shielding member is reduced, the impedance of the shielding assembly is more excellent, and the insertion loss, crosstalk and the like are more excellent.

The invention provides a coaxial cable connector. The coaxial cable connector comprises a connector for relaying a cable. The connector includes: a contact including a conductor; an inner housing including an insulator and supporting the contact; and an impedance regulator having a portion incorporated in the inner housing and including a conductor. The impedance regulator covers an exposed portion of a cable core wire connected to the contact member, the exposed portion being exposed from the inner housing.

This application provides a positive electrode active material and a preparation method thereof, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus. The positive electrode active material includes a core containing Li1+xMn1yAyP1-zRzO4, a first coating layer covering the core and containing a crystalline pyrophosphate MaP2O7 and a crystalline oxide M'bOc, and a second coating layer covering the first coating layer. The positive electrode active material in this application can reduce the generation of Li / Mn antisite defects, reduce the dissolution of manganese, and decrease the lattice change rate, increasing the capacity of the secondary battery and improving the cycling performance, high-temperature storage performance, and safety performance of the secondary battery.

This application provides a positive electrode active material and a preparation method thereof, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus. The positive electrode active material includes a core containing LimAxMn1-yByP1-zCzO4-nDn, a first coating layer enveloping the core and containing a crystalline pyrophosphate LiaMP2O7 and / or Mb(P2O7)c, a second coating layer enveloping the first coating layer and containing an oxide M'dOe, and a third coating layer enveloping the second coating layer and containing carbon. The positive electrode active material of this application can reduce Li / Mn anti-site defects produced, reduce dissolving-out amount of manganese, lower the lattice change rate, increase the capacity of the secondary battery, and improve the cycling performance, high-temperature storage performance, and safety performance of the secondary battery.

The present invention relates to a functionalized wide-width implantable microelectrode array and a preparation method and application thereof. The functionalized wide-width microelectrode array comprises a functional layer, a substrate layer, a conductive layer, and an insulating layer arranged in sequence; the functional layer is a monomolecular layer, a polymer material layer and / or a polymer composite layer, and the thickness is 1nm-1000μm. The present invention also provides a preparation method for the above-mentioned functionalized wide-width implantable microelectrode array. The functionalized wide-width microelectrode array of the present invention can effectively adjust the microelectrode sites, circuits, spacing and other related parameters by increasing the size of the microelectrodes, thereby reducing the process complexity in the micro-machining process of the microelectrodes, greatly improving the yield of high-cost microelectrode arrays, and solving the design problems of high-density microelectrode arrays; through the functionalized wide-width design, the folding or curling function of the microelectrode array can be realized, thereby realizing minimally invasive implantation and greatly reducing surgical risks.

The utility model relates to the technical field of cables, and discloses a drag chain cable, which comprises a wire core main body, a plurality of conductor wire cores, a plurality of conductor wire cores and a plurality of conductor wire cores, the wrapping tape layer is wrapped on the periphery of the wire core main body, and the wrapping tape layer comprises a foamed polyethylene wrapping tape layer which is wrapped on the wire core main body; and the sheath layer is coated on the periphery of the wrapping tape layer. The drag chain cable provided by the utility model is beneficial to improving the swing performance and impedance stability of the drag chain cable.

The optical module provided by the present disclosure comprises: a circuit board on which an impedance matching line is formed; the DSP chip is arranged on the circuit board and is electrically connected with one end of the impedance matching line; the silicon optical chip is arranged on the circuit board and is electrically connected with the other end of the impedance matching line; the DSP chip receives an electric signal sent by an upper computer and transmits the processed electric signal to the silicon optical chip through the impedance matching line, so that the silicon optical chip generates an optical signal; the output impedance of the DSP chip is larger than the impedance of the silicon optical chip, and the impedance matching line matches the impedance of the DSP chip and the silicon optical chip. The impedance matching line comprises a first connecting part which is electrically connected with the DSP chip; one end of the impedance matching part is connected with the first connecting part; the impedance matching part comprises a plurality of matching sections; the impedance of one end of each matching section is greater than that of the other end of each matching section; and one end of the second connecting part is connected with the other end of the impedance matching part and is electrically connected with the silicon optical chip. According to the optical module provided by the invention, impedance matching of the DSP chip and the silicon optical chip is facilitated.

The invention provides an electric connector for a circuit substrate, which allows a movable housing to move relative to a fixed housing and can realize good impedance matching. At least a part of an intermediate section (15) of the terminal (10) is positioned in an internal space (25) of the circuit board electrical connector (1), and the circuit board electrical connector (1) has an edge section (23) made of a dielectric material, which is positioned on the opposite side from the internal space (25) with respect to the intermediate section (15), and which extends along the intermediate section (15) with a gap therebetween. When the middle part (15) is elastically deformed in the connector width direction which is perpendicular to the terminal arrangement direction, the edge arrangement part (23) can follow the middle part (15).

The invention belongs to the field of ultra-wideband antennas, and provides a miniaturized ultra-wideband antenna with trapped waves, which basically structurally comprises a dielectric substrate, a radiation unit and a microstrip feeder which are attached to one side of the dielectric substrate, and a grounding plate attached to the other side of the dielectric substrate. The radiation unit is formed by combining a circle and a polygon, and a U-shaped notch groove is formed in the radiation unit and used for suppressing electromagnetic waves of unneeded frequency bands. The grounding plate is provided with a second-order Minkowski fractal groove which is used for impedance optimization of the antenna. The ultra-wideband antenna provided by the invention is a monopole antenna, a Teflon ZYF300CA-C high-frequency plate is selected, the size of the antenna is 22mm * 28mm * 0.76 mm, the dielectric constant Dk of a substrate is 2.94, and the loss tangent Df is 0.0016; and the impedance of the microstrip feeder is 50 ohms. According to the invention, trapped waves can be generated near a 5.5 GHz frequency point, and S11lt can be satisfied in a frequency range of 3.47 to 4.92 GHz and a frequency range of 5.83 to 13.54 GHz; and-10 dB. The antenna has the characteristics of miniaturization, ultra wide band, omnidirectivity and low profile, and can be applied to an ultra wide band (UWB) communication technology.

The present invention provides a support for a lithium ion secondary battery, said support being included in a solid electrolyte layer of a lithium ion secondary battery, wherein said support is paper or a nonwoven fabric in which the thermal dimensional change rates in the machine direction and cross direction are both -10 to 5%, the air permeability is 1 to 50 L / cm2 / min., and the post-heat-treatment bending resistances in the machine direction and the cross direction are in the range of 5 to 250 mN.

The utility model discloses a compensation capacitance box for error testing of a current transformer. The compensation capacitance box comprises a power factor unit, a combined capacitor unit and a resonance suppression unit, the power factor unit is arranged between the input ends or the output ends, the combined capacitor unit is arranged between the input ends or the output ends, the combined capacitor unit is located on one side of the power factor unit, and the resonance suppression unit is connected in a circuit of the combined capacitor unit in series; according to the utility model, the power factor unit and the combined capacitor unit are adopted, a real-time power supply power factor is monitored through the power factor unit, and the combined capacitor unit is used for connection or disconnection; a resonance suppression unit is further arranged, the circuit impedance is optimized by the resonance suppression unit, and the influence of harmonic waves on the circuit is reduced; the adjustable capacitor driven by the servo motor and the parallel RC damping loop work cooperatively, and the compensation capacitance and the circuit impedance are adjusted dynamically.

A connector cable comprising a connector, a shielded cable and a relay substrate, the connector and the shielded cable being connected via the relay substrate, wherein the shielded cable includes at least an inner conductor, a dielectric covering the inner conductor, and a shield member covering the dielectric, the inner conductor is connected to a contact of the connector at a part where the shield member and the dielectric are removed to expose the inner conductor, at least directly under a part where the shield member is removed to expose the dielectric, a ground conductor layer on a front surface of the relay substrate is arranged, and the ground conductor layer on the front surface of the relay substrate, which is arranged directly under the part where the shield member is removed, is covered with an insulating member, wherein the connection part between the contact of the connector and the exposed inner conductor of the shielded cable is connected by soldering, and the relay substrate is cut out at a part directly under the contact of the connector and the exposed inner conductor of the shielded cable for forming a cut-out region where the relay substrate including the ground conductor layer is absent.

The invention discloses a double-antenna design method for high-precision positioning, and belongs to the technical field of high-precision positioning antennas. The radiation unit is used as a radiator, so that the resonant frequency and the radiation characteristic of the antenna are optimized, the radiation unit adopts a winding form, and the physical size and the effective length of the antenna are optimized; meanwhile, the slotting technology is applied, the current distribution and bandwidth of the antenna are optimized, the PCB serves as a reflecting surface, the inner end in the radiation unit is used for grounding and feeding, the resonance characteristic and impedance of the antenna are optimized, the included angle between the two antennas is designed to be 90 degrees, the port isolation degree and the polarization diversity gain are optimized, and therefore the antenna is smaller in size, small in size and high in practicability. In the 2.4 G frequency band, the horizontal radiating surface has good omnidirectivity, the anti-multipath effect is achieved, the occupied area is reduced, meanwhile, the cost is reduced, and the positioning precision is improved.

This application belongs to the field of battery technology, and particularly relates to silicon-carbon composite materials and their preparation methods, electrodes, and batteries. The method includes: mixing asphalt with potassium hydroxide and dopants uniformly, heating to a first preset temperature, passing a crosslinking agent mixed gas at a first preset flow rate for first activation, cooling to obtain asphalt-based porous carbon; adding the asphalt-based porous carbon to an aldehyde compound solution, then adding a phenolic compound and a catalyst and mixing uniformly, performing a hydrothermal reaction, filtering, and performing a second activation to obtain a hard carbon-coated soft carbon porous carbon composite material; immersing the porous carbon composite material in a liquid silane solution and reacting under closed negative pressure to obtain an intermediate material; heating the asphalt to a molten state, then adding the intermediate material and an organoniobium compound and stirring uniformly to perform carbonization to obtain a silicon-carbon composite material; possessing low expansion, high pore volume, low impedance, and high compaction density, thus improving the electrochemical performance of the battery.

The invention discloses a light emitting device. The light emitting device comprises a metal tube seat, a first pin and a second pin, a first substrate and a second substrate, wherein the first substrate comprises a first conductive surface and a second conductive surface; the second substrate comprises a third conductive surface and a fourth conductive surface, the third conductive surface is connected with the first conductive surface through a first lead, and the fourth conductive surface is connected with the second conductive surface through a second lead; wherein the third conductive surface is connected with the first pin through a third lead, and the fourth conductive surface is connected with the second pin through a fourth lead; the height of the second substrate can be adjusted to shorten the size of the first lead, the second lead, the third lead or the fourth lead. According to the light emitting device provided by the invention, by adjusting the height of the second substrate, the first lead and the second lead between the first substrate and the second substrate and the third lead and the fourth lead connected between the second substrate and the first pin and the second pin are shortened, so that the influence of parasitic inductance brought by the long lead on a circuit is reduced.

The invention discloses an impedance compensation method, system and device for a printed circuit board and a medium. The method comprises the steps that a target bonding pad needing impedance compensation in the printed circuit board is determined; a reference ground plane which is not adjacent to the signal layer where the target bonding pad is located is selected, and a local hollowed-out area is formed in the reference ground plane; wherein the local hollowed-out area is located in the vertical projection range of the target bonding pad, and at least one dielectric layer is arranged between the reference ground plane and the signal layer where the target bonding pad is located; performing simulation verification on the characteristic impedance of the target bonding pad after the local hollowed-out area is set; according to a simulation result, at least one design parameter of the local hollowed area is adjusted until the characteristic impedance at the target bonding pad meets a preset impedance target value; according to the invention, the impedance problem at the target bonding pad can be actively improved, and the impedance adaptability of the printed circuit board is improved so as to realize stable transmission of signals.

The application provides a lithium manganese iron phosphate battery formation process, by setting a separate film forming and charging and discharging stage, the film forming effect of various additives in the electrolyte is improved; the formation process significantly improves the uniformity and compactness of the positive and negative solid electrolyte membranes, so that the lithium manganese iron phosphate battery after formation has lower impedance and better high-temperature cycle performance, and reduces the later gas generation of the battery; in addition, the battery is subjected to charging and discharging treatment at the film forming potential of the additives, the film forming additives can be fully reacted to form a film, and the consumption of active lithium during the film forming period is reduced, the high reactivity of active lithium and its film forming products on the negative side is effectively reduced, and the safety and stability of the battery are improved.

The invention discloses an interface coated solid-state electrolyte and a lithium ion solid-state battery, the interface coated solid-state electrolyte comprises a solid-state electrolyte and an LMF interface modification layer arranged on the surface of the solid-state electrolyte; the thickness of the LMF interface modification layer is smaller than or equal to 60 nm. Through the arrangement of the LMF interface modification layer with the thickness of less than or equal to 60nm, under the synergistic effect of Li-Mg alloy and LiF in the LMF interface modification layer, the contact resistance between lithium metal and the electrolyte is effectively improved, the impedance of the interface-coated solid electrolyte can be effectively reduced by adopting simple and low-cost raw materials and a preparation process, and the interface-coated solid electrolyte has the advantages of low cost and high efficiency. Further, the electrochemical performance of the prepared lithium ion solid-state battery is effectively improved.

This invention discloses a broadband dual-band multimode omnidirectional antenna, comprising a circular radiating patch, a dielectric layer, and a metal ground plane stacked sequentially. The upper surface of the dielectric layer is the circular radiating patch, and the lower surface is the metal ground plane. The circular radiating patch is divided into an inner circular radiating patch and an outer annular radiating patch, with an annular slot and an annular metal wall disposed between the inner circular radiating patch and the outer annular radiating patch. A coaxial probe and an arc-shaped slot are disposed at the center of the inner circular radiating patch. The coaxial probe is used to suppress the generation of non-omnidirectional modes while exciting omnidirectional modes. The arc-shaped slot for impedance matching is etched into the inner circular radiating patch. This invention improves the distortion of the higher-order mode radiation pattern and features a simple structure, dual-band broadband, and omnidirectional radiation.

The application provides a battery and a formation and aging method thereof. The formation and aging method comprises the following steps: sequentially performing one-time liquid injection, standing, formation, secondary liquid injection, aging and capacity grading on an electric core to obtain the battery; the liquid injection amount of the one-time liquid injection accounts for 85-97% of the total liquid injection amount; the highest SOC of the formation is 75-90%; the aging time is defined as a, the unit being h; the aging temperature is defined as b, the unit being DEG C; the SOC of the aging is defined as c; the numerical values of a, b and c satisfy the formula: K=(c*b) / a, K is an aging balance coefficient, 0.056<=K<=2.5; the restraint force of the capacity grading is greater than or equal to 5000N. The formation and aging method solves the problem that the uncompleted side reaction in the process continuously intensifies in the high-temperature application stage due to the insufficient impregnation of electrolyte, the loose SEI film structure and the manganese ion dissolution and gas residue of the lithium manganese iron phosphate electric core in the formation and aging process.

This application provides a wireless charging transmitting terminal, charging base, and system, and relates to the field of terminal technologies. The transmitting terminal includes an inverter circuit, n transmitting coils, a suppression circuit, and a controller, where n is an integer greater than or equal to 2; each of the n transmitting coils is connected to an output terminal of the inverter circuit; the inverter circuit is configured to convert a direct current into an alternating current and transmit the alternating current to at least one of the n transmitting coils, the at least one of the n transmitting coils works, and a remaining transmitting coil does not work; and the controller is configured to ground the non-working transmitting coil through the suppression circuit, to suppress a conducted emission and a radiated emission of the non-working transmitting coil. To be specific, the conducted emission and the radiated emission of the non-working transmitting coil are transferred to the ground, to reduce the conducted emission and the radiated emission generated by the non-working transmitting coil, thereby overall suppressing an interfering signal generated by the transmitting terminal.