13results 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.

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.

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.

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 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.

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 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.

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.