42results about How to "Reduce AC impedance" patented technology

The invention relates to an LTCC low temperature co-fired ceramic planar transformer. The transformer comprises a ferrite magnetic core composed of an upper magnetic core and a lower magnetic core. The transformer is characterized in that the transformer also comprises an LTCC planar transformer base plate provided with at least one group of planar coil component, each planar coil component comprises a primary coil with high coupling coefficient and a secondary coil; the LTCC planar transformer base plate is provided with one or three penetrating holes used for assembling the ferrite magnetic core; and the upper and lower magnetic cores separately penetrate the penetrating holes from the upper and lower sides of the LTCC planar transformer base plate and are butted and adhered together to form the ferrite magnetic core. Compared with the traditional planar transformer, the LTCC low temperature co-fired ceramic planar transformer of the invention has the following beneficial effects: the transformer of the invention has low direct current impedance, leakage inductance and distributed capacitance and can satisfy the design requirement of the resonance circuit; and as the magnetic core has good magnetic shielding, the transformer can inhibit the radio frequency interference.

The present invention relates to a preparation method of micron flower-ball-shaped high-performance full-hydrolytic bifunctional electrocatalyst FeOOH/Ni3S2. According to the method, firstly, thioureaand nickel nitrate are adopted as raw materials, ethanol is adopted as a solution, cetyl trimethyl ammonium bromide is adopted as a surfactant, a solvothermal method is utilized to generate Ni3S2 ona foamed nickel substrate in situ, and then the micron flower-ball-shaped electrocatalyst FeOOH/Ni3S2 is formed on Ni3S2 through one-step electrochemical deposition. The composite catalyst FeOOH/ Ni3S2 obtained by means of the method is low in overpotential and high in stability and has a broad application prospect in the aspects of preparation of clean hydrogen energy through electrocatalytic water decomposition and the like.

The invention provides a modified carbon nano tube and a preparation method thereof, a lithium ion battery anode and a preparation method thereof and a lithium ion battery. The modified carbon nano tube comprises a carbon nano tube and a polar group on the surface of the carbon nano tube, wherein the polar group is -COOLi. The modified carbon nano tube provided by the invention has the characteristics of being easy to disperse, low in dispersing cost and good in electrical conductivity; compared with a lithium ion battery adopting the dispersion liquid of an unmodified carbon nano tube as a conductive agent, the lithium ion battery adopting the dispersion liquid of the carbon nano tube as a conductive agent has a lower direct current impedance and alternating-current impedance, and is greatly improved in the high-rate charge-discharge capability.

The invention discloses a generator-rotor inter-turn short circuit diagnosis device based on excitation step method. The device comprises a direct current constant voltage source and data acquisition analyzers. The direct current constant voltage source is connected to an excitation winding through a first program control switch. A sampling resistor is connected in series to the excitation winding. The data acquisition analyzers are connected in parallel to two ends of the sampling resistor. The data acquisition analyzers determine whether a motor rotor winding generates an inter-turn short circuit through collecting an excitation current of the rotor winding. Two ends of the excitation winding are connected in parallel to a de-excitation resistor through a second program control switch. By using the device and the method of the invention, disadvantages in the prior art can be overcome, and an off-line diagnosis level of a turbonator rotor winding inter-turn short circuit fault is improved.

A high-temperature planar transformer employing a metal coated ceramic substrate comprises a dual-annular closed-structure magnetic core and multiple groups of ceramic substrate planar coils employinga metal coated technology, wherein the dual-annular closed-structure magnetic core is formed by splicing a group of Fe-Ni-Mo metal magnetic powder cores, all planar coil assemblies form a primary winding and a secondary winding of the transformer, an installation hole is reserved in the ceramic substrate employed by the high-temperature planar transformer and is used for placing the metal magnetic powder core material magnetic cores, and two parts of magnetic cores are placed in the installation hole from two sides of the ceramic substrate and then are abutted and pasted to a whole. Comparedwith a traditional winding transformer and a planar transformer, the high-temperature planar transformer employing the metal coated ceramic substrate has the following advantages that the power density of the transformer can be substantially improved by employing the metal coated ceramic substrate, the leakage inductance and the distributed capacitance of the transformer are reduced, the cooling efficiency is improved, moreover, the transformer can work for a long time in a high-temperature environment of 200 DEG C or above, so that the cooling design of the transformer can be simplified, thesize and the weight of the transformer are reduced, and meanwhile, the design requirement of aerospace and oil drilling in high-temperature environment industry on a switch power supply is met.

The invention discloses a platinum black pulse plating method based on ultrasonic assistance and belongs to the field of biomedicine engineering technology. The method comprises the steps of: vertically putting an electrode to be platinized and a platinum wire auxiliary electrode into an electroplate liquid and respectively connecting with the positive pole and the negative pole of a power supply; then applying pulse current and starting an ultrasonic device at the same time; and finally turning off the power supply and the ultrasonic device, taking the platinized electrode out and washing with deionized water to obtain a platinum black plating layer attached to the platinized electrode. The platinum black obtained by the invention can obtain greatly reduced particle diameter and better bonding force between the plating layer and a microelectrode substrate and is not easy to fall off to cause failure of the electrode; in addition, the platinized microelectrode obtains greatly reduced AC impedance and greatly increased electrode charge injection capacity and charge storage capacity, which is beneficial to the reduction of embedded system power consumption and the improvement of electric stimulus effect.

The invention relates to the field of displays, in particular to a radiation-proof liquid crystal display panel which comprises a liquid crystal display panel body and a panel frame, wherein the liquid crystal display panel body is embedded in the panel frame, and a protective film is arranged on the liquid crystal display panel body. The protective film comprises an antistatic layer, a base layerand an anti-radiation layer, wherein the anti-radiation layer is located above the base layer, and the antistatic layer is located above the anti-radiation layer. The problems that various functionalcomputer protective films exist on the market at present, but most computer protective films are high-molecular polymer films such as PE, PVDC and the like which are synthesized and prepared from petrochemical materials, but do not have a radiation-proof function. The liquid crystal display panel provided with the protective film can have a good anti-radiation effect in use.

The invention discloses a small-sized two-pole single-phase generator, comprising a rotor (1) and a stator (2), wherein, the rotor stretches into the stator (2); coiling grooves (3) are distributed at the upper part and the lower part of the rotor (1); winding coils (4) are arranged at the two sides of the iron core of the stator (2); the winding coils (4) are secondary windings; winding assemblies are arranged at the upper part and the lower part of the iron core of the rotor (1), and are arranged symmetrically; and sawtooth-shaped radiating grooves (7) are distributed on the outer surface of the iron core of the stator (2). The small-sized two-pole single-phase generator of the invention greatly lowers the waveform sinusoidal aberration rate of the voltage output by the generator, greatly enhances the adaptability to the capacitive load, and is beneficial for prolonging the service of the electric appliances.

The invention relates to the technical field of battery materials, and discloses a nano silicon composite particle, a negative plate and a solid lithium battery, the nano silicon composite particle is N-P-COF-GO modified nano silicon composite particle, COF and GO are loaded on the surface of the silicon nano particle, and N and P are co-doped in the COF and GO; the preparation method comprises the following steps: dispersing silicon nanoparticles, a phosphorus source material, a nitrogen source material and graphene oxide in an organic solvent, and synthesizing N-P-COF-GO modified nano silicon composite particles by adopting a solvothermal method; the negative plate and the solid lithium battery are prepared from the nano silicon composite particles. According to the invention, the defects of obvious volume expansion and continuous growth of a surface SEI layer of a silicon material in continuous charging and discharging are overcome, rapid transmission and storage of lithium ions are realized, and a negative plate and a solid lithium battery prepared from the nano silicon composite particles have lower alternating current impedance and higher discharge capacity and cycle performance.

The invention relates to an LED (light emitting diode) lamp using inductance voltage reduction. The LED lamp comprises a voltage stabilizing diode VD and a rectistack D, wherein the voltage stabilizing diode VD is connected in series with the LED lamp. The LED lamp is characterized in that the alternating current input end of the rectistack D is respectively connected with a first inductor L1 and a second inductor L2. The LED lamp has the advantages that the characteristics of the inductance are used; the alternating current impedance is high; the direct current impedance is small; inductors are connected in series in the power supply input end of the LED lamp; the voltage of the alternating current is reduced; a power supply suitable for LEDs to work is obtained; meanwhile, the direct current can also smoothly pass through the inductors to return the line; high heat cannot be generated when the inductors work; the work performance is reliable.

The composite porous aerogel material comprises nanocellulose, graphene oxide and ZIF-Zn/Co, the nanocellulose and the graphene oxide are interwoven through intermolecular interaction force to form a 3D network structure, the ZIF-Zn/Co is uniformly dispersed on the 3D network structure through the intermolecular interaction force, and the material is in an inert atmosphere, so that the composite porous aerogel material is prepared. The composite porous carbon aerogel material has excellent electrochemical performance and mechanical strength, and can be used for preparing an electrode material.

The invention provides a liquid metal negative pole piece as well as a preparation method and application thereof. And the surface of the negative pole piece is coated with a liquid alloy. The invention provides a liquid metal electrode of which the surface of metal lithium is coated with a liquid alloy, so the interface contact between an electrolyte and a negative electrode is improved, the critical current density of a solid electrolyte is greatly improved, pores generated by lithium removal can be filled in a circulating process, self-healing of an interface is realized, formation and growth of lithium dendrites are avoided, and the interface contact problem is effectively solved.

The invention provides silver-silver chloride paste for a flexible electrocardiogram detection electrode and application of the silver-silver chloride paste. The silver-silver chloride paste comprises silver powder, silver chloride powder, a binder and a solvent; the mass ratio of the silver powder in the silver-silver chloride paste is 30-50%, the mass ratio of the silver chloride powder in the silver-silver chloride paste is 15-22%, and the mass ratio of the binder in the silver-silver chloride paste is 4-6.5%. By regulating and controlling the mass ratio of the raw materials in the silver-silver chloride paste for the flexible electrocardiogram detection electrode, the obtained flexible electrocardiogram detection electrode has the advantages of low alternating current impedance, good adhesive force, good electrode potential stability, high signal-to-noise ratio and the like, and can be applied to adult electrocardiogram, especially weak fetal electrocardiogram signals.