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418results about How to "Improve power performance" patented technology

Compensator for removing nonlinear distortion

The present invention is a computationally-efficient compensator for removing nonlinear distortion. The compensator operates in a digital post-compensation configuration for linearization of devices or systems such as analog-to-digital converters and RF receiver electronics. The compensator also operates in a digital pre-compensation configuration for linearization of devices or systems such as digital-to-analog converters, RF power amplifiers, and RF transmitter electronics. The compensator effectively removes nonlinear distortion in these systems in a computationally efficient hardware or software implementation by using one or more factored multi-rate Volterra filters. Volterra filters are efficiently factored into parallel FIR filters and only the filters with energy above a prescribed threshold are actually implemented, which significantly reduces the complexity while still providing accurate results. For extremely wideband applications, the multi-rate Volterra filters are implemented in a demultiplexed polyphase configuration which performs the filtering in parallel at a significantly reduced data rate. The compensator is calibrated with an algorithm that iteratively subtracts an error signal to converge to an effective compensation signal. The algorithm is repeated for a multiplicity of calibration signals, and the results are used with harmonic probing to accurately estimate the Volterra filter kernels. The compensator improves linearization processing performance while significantly reducing the computational complexity compared to a traditional nonlinear compensator.
Owner:LINEARITY LLC

Super capacitor-based electric automobile hybrid power control system

The invention discloses a super capacitor-based electric automobile hybrid power control system. The system comprises a super capacitor, a power storage battery, a motor, a motor driving control device, a vehicle-mounted measuring unit, a first bidirectional direct current (DC) / DC converter and a second bidirectional DC / DC converter, wherein the motor driving control device is connected with the motor; the vehicle-mounted measuring unit is connected with the motor driving control device through a controller area network (CAN) bus; the first bidirectional DC / DC converter is connected between the super capacitor and the motor driving control device; and the second bidirectional DC / DC converter is connected between the power storage battery and the motor driving control device. Through the system, the super capacitor provides high-power current when an electric automobile is started and accelerated and climbs, so that the power performance of the entire automobile is enhanced; instant heavy current generated by a generator is quickly stored during braking; the braking feedback energy is absorbed; the energy is saved; and the cyclic service life of the storage battery is prolonged. By using the system, the power performance and the economy of the electric vehicle are improved, the storage battery is protected, and the stability of the system is enhanced.
Owner:RES INST OF XIAN JIAOTONG UNIV & SUZHOU

Method for preparing nitrogen-doped porous carbon nanofiber cloth

The invention relates to a method for preparing nitrogen-doped porous carbon nanofiber cloth. The nitrogen-doped porous carbon nanofiber cloth is prepared by adding a nitrogen-rich compound into an organic solution, electrospinning and subsequent carbonizing-activating, has a self-support structure, omits preparation steps of size mixing, coating and the like, needs no conductive agent or binder, and can be directly used as the negative electrode of a lithium ion battery. The electrochemical performance of the negative electrode material of the lithium ion battery is improved by doping nitrogen and activating and forming pores; compared with a commercial graphite lithium ion battery negative electrode material, the nitrogen doping porous carbon nanofiber cloth used as the negative electrode material of the lithium ion battery has simple steps for preparing the electrode, has higher specific capacity, good power performance and circulatory stability. The method also can be used as the electrode material of super capacitors and other novel batteries.
Owner:TSINGHUA UNIV

Positive electrode active materials for secondary batteries and methods of preparing same

InactiveUS6878490B2Deliver in short periodRetake in short periodAluminium compoundsAlkali titanatesPower capabilityLithium metal
The present invention is a positive electrode active material that can be used in secondary lithium and lithium-ion batteries to provide the power capability, i.e., the ability to deliver or retake energy in short periods of time, desired for large power applications such as power tools, electric bikes and hybrid electric vehicles. The positive electrode active material of the invention includes at least one electron conducting compound of the formula LiM1x−y{A}yOz and at least one electron insulating and lithium ion conducting lithium metal oxide, wherein M1 is a transition metal, {A} is represented by the formula ΣwiBi wherein Bi is an element other than M1 used to replace the transition metal M1 and wi is the fractional amount of element Bi in the total dopant combination such that Σwi=1; Bi is a cation in LiM1x−y{A}yOz; 0.95≦x≦2.10; 0≦y≦x / 2; and 1.90≦z≦4.20. Preferably, the lithium metal oxide is LiAlO2 or Li2M2O3 wherein M2 is at least one tetravalent metal selected from the group consisting of Ti, Zr, Sn, Mn, Mo, Si, Ge, Hf, Ru and Te. The present invention also includes methods of making this positive electrode active material.
Owner:UMICORE AG & CO KG

Silicon/graphene laminar composite material for lithium ion battery cathode and preparation method thereof

The invention relates to a preparation method of a silicon/graphene laminar composite material for lithium ion battery cathode. The composite material adopts a laminar sandwich structure, silicon nano-particles are dispersed on each lamina of the grapheme, the laminas of the grapheme are separated from one another by the silicon nano-particles and the edges of the laminas are in lapped joint so as to constitute a laminar conductive network structure. The preparation method thereof comprises the steps of: formulating anhydrous silicon tetrachloride, surface active agent, sodium naphthalene and graphite oxide to tetrahydrofuran solution, adding the tetrahydrofuran solution into a reactor for reaction in vacuum at the temperature ranging from 380 to 400 DEG C, filtering the reactant to result in the product, and then washing, drying and heating the product to obtain the silicon/grapheme composite material. The preparation method of the invention has the advantages of simple preparation process and great easiness for industrial production; and the silicon/graphene laminar composite material prepared according to the method includes excellent conductivity, power performance, electrochemical activity and cycle stability, and is particularly suitable for manufacturing lithium ion battery cathode.
Owner:深圳清研紫光科技有限公司

Amplifier linearizer

The present invention provides an advanced adaptive predistortion linearization technique to dramatically reduce nonlinear distortion in power amplifiers over a very wide instantaneous bandwidth (up to 2 GHz) and over a wide range of amplifier types, input frequencies, signal types, amplitudes, temperature, and other environmental and signal conditions. In an embodiment of the invention, the predistortion linearization circuitry comprises (1) a higher-order polynomial model of an amplifier's gain and phase characteristics—higher than a third-order polynomial model; (2) an adaptive calibration technique; and (3) a heuristic calibration technique. The higher-order polynomial model is generated by introducing, for example, a plurality of multi-tone test signals with varying center frequency and spacing into the power amplifier. From the power amplifier's corresponding output, the nonlinearities are modeled by employing a higher-order curve fit to capture the irregularities in the nonlinear transfer function. Different distortion transfer functions can be implemented for different operating conditions. The adaptive calibration technique is based on a feedback analysis technique, which updates the applicable distortion transfer function by analyzing the error signal between the introduced input signal and the output signal in real-time. The heuristic calibration technique implements different distortion transfer functions based on historical operating conditions and optimal configurations of the power amplifier.
Owner:TM IP HLDG LLC

Core-shell structured carbon for cathode material of lithium ion battery and preparation method thereof

InactiveCN101969122AImprove energy density and power densityGood coulombic efficiencyCell electrodesSecondary cellsLithium electrodeLarge capacity
The invention relates to the technical field of lithium ion batteries, in particular to core-shell structured carbon for a cathode material of a lithium ion battery and a preparation method thereof, and the lithium ion battery taking the core-shell structured carbon as the cathode material and a preparation method thereof. The core-shell structured carbon comprises a hard carbon material serving as a 'core' and soft carbon 'shell' which is coated on the surface of the 'core'. On the one hand, the hard carbon material serving as the 'core' provides a large number of spaces for storing lithium and channels for lithium ions to move, and the energy density and power density of the material are improved, and on the other hand, the soft carbon 'shell' with a graphite structure ensures that the material has high coulombic efficiency and cycle performance, so that the lithium ion battery made of the core-shell structured carbon serving as the cathode material has high capacity, high power characteristic, high cycle performance and high first charge and discharge coulombic efficiency, the preparation method is simple, and the cost is low.
Owner:DONGGUAN MCNAIR NEW POWER

Molybdenum disulfide/mesoporous carbon composite electrode material as well as preparation method and application thereof

ActiveCN103915630AImprove the utilization rate of electrochemical activityIncrease spacingCell electrodesSecondary cellsChemical reactionThiourea
The invention discloses a molybdenum disulfide / mesoporous carbon composite electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an oleic acid molecule intercalation molybdenum disulfide precursor through a hydrothermal reaction by adopting oleic acid and sodium oleate as a structure-directing agent and sodium molybdate and thiourea as a molybdenum source and a sulfur source; introducing dopamine into an interlayer by virtue of a chemical reaction of dopamine and oleic acid molecules; self-polymerizing molybdenum disulfide interlayer dopamine to form poly(dopamine) by adopting a tri-block copolymer, polyoxyethylene-polypropylene oxide-polyxyethylene, as a soft template, and then performing a high-temperature carbonization process to prepare the mesoporous carbon-embedded molybdenum disulfide interlayer nano hybrid material. By embedding mesoporous carbon, not only can the interlayer distance of molybdenum disulfide be increased and the re-accumulation of nano-sheets be effectively prevented, but also the electronic conductivity of molybdenum disulfide can be remarkably improved. An electrochemical test result proves that as a lithium ion battery negative material, the molybdenum disulfide / mesoporous carbon composite electrode material has high specific capacity, excellent rate performance and excellent cycling performance, and can be widely applied to the field of lithium ion batteries.
Owner:EAST CHINA UNIV OF SCI & TECH

Silicon-based negative electrode of lithium ion battery and method for preparing silicon-based negative electrode of lithium ion battery

The invention discloses a silicon-based negative electrode of a lithium ion battery and a method for preparing the silicon-based negative electrode of the lithium ion battery. The silicon-based negative electrode is prepared by coating a copper foil with negative electrode slurry. The negative electrode slurry is prepared from, by weight, 15.0-18.0 parts of graphite, 1.0-2.0 parts of nano silicon powder, 0.3-2.5 parts of conductive agent, 1.0-8.0 parts of binding agent, 1.0-1.5 parts of thickening agent and 70.0-80.0 parts of dispersing medium. By adoption of a polystyrene-polybutyl acrylate- polystyrene block polymer binding agent which is extremely high in silicon binding force and capable of providing high elasticity, volume variation of silicon in charging and discharging can be counteracted, and performances of a graphene-based negative electrode of the lithium ion battery are improved. The prepared high-energy-density negative electrode is 514mAh / g in energy density during 0.1C charging and discharging, and the power negative electrode is 349mAh / g in energy density in 2C charging and discharging. The silicon-based negative electrode of the lithium ion battery and the method for preparing the silicon-based negative electrode of the lithium ion battery have the advantages of easiness in raw material acquisition, technical simplicity and environment friendliness.
Owner:ZHEJIANG UNIV

Torque distribution method and device for four-wheel drive system of electric automobile

ActiveCN105460001AImprove power performanceImprove fuel economy and ride comfortControl devicesAutomotive engineeringFour-wheel drive
The invention discloses a torque distribution method for a four-wheel drive system of an electric automobile. The method includes the steps of collecting operation state parameters of the electric automobile, judging operation working conditions of the electric automobile according to the operation state parameters of the electric automobile, obtaining whole state information of the electric automobile, and distributing the torque of the four-wheel drive system according to the operation working conditions and the whole state information of the electric automobile. By means of the torque distribution method for the four-wheel drive system of the electric automobile, the torque of the four-wheel drive system can be automatically distributed, and the torque of one wheel can be independently controlled; the method is convenient and flexible, the power property of the electric automobile is effectively improved, fuel consumption economy and driving comfort of the electric automobile are greatly improved, and safety is high. The invention further discloses a torque distribution device for the four-wheel drive system of the electric automobile.
Owner:BYD CO LTD

Semiconductor Power Switch

A semiconductor power switch comprises at least a first IGBT and a second IGBT. The collectors of the first and second IGBTs are connected to each other, and the emitters of the first and second IGBTs are connected to each other. The first IGBT is an IGBT type with a comparatively low collector-emitter on-voltage and a comparatively high turn-on or turn-off switching energy. In contrast thereto, the second IGBT is an IGBT type with a comparatively high collector-emitter on-voltage and a comparatively low turn-on or turn-off switching energy. Both IGBTs receive gate signals from a control circuit for switching the power switch on during a first time interval and switching the power switch off during a second time interval. The control circuit is designed to supply an on-signal to the second IGBT during the whole first time interval and another on-signal to the first IGBT during only a part of the first time interval, which is less than the whole.
Owner:SCHLEIFRING & APPBAU
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