7results 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.

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 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.

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.