129 results about "Composite pulse" patented technology

The invention relates to the technical field of lithium battery parameter determination methods, in particular to a lithium battery capacity rapid estimation method. The lithium battery capacity rapid estimation method comprises the following steps: (1) taking the-number-set training sample batteries to have an internal resistance test by using a composite pulse current method in order to obtain internal resistance values of the training sample batteries, (2) testing capacity values of the training sample batteries by using a constant current constant voltage test method, (3) taking time-set various current internal resistance of different sampling time of the training sample batteries as input and taking the capacity values as output to establish an internal resistance-capacity neural network model, (4) and testing internal resistance of predicting sample batteries and evaluating the capacity values by using the internal resistance-capacity neural network model established by the training sample batteries. By using the non-linear relationship between the internal resistance and the capacity to establish the internal resistance-capacity neural network model, the lithium battery capacity rapid estimation method can rapidly estimate the capacity of the batteries, eliminate the batteries which have no use value, reduce power loss and equipment loss required in a traditional capacity test, and greatly improve economy.

Quantum resonance fluorescent microscope systems for detecting component substances in a specimen are described. The systems are based on exciting the sample containing the material with a femtosecond to nanosecond probe pulse of collimated light, which is tailored to optimize detection of a given material by separating the probe pulse into component features of frequency, polarization, phase and/or amplitude. The component features are independently shaped and formed into a composite pulse selected to optimize a signature response pulse received from the material. In some cases, two independently re-shaped pulses are combined, where one re-shaped pulse has two mixed polarization states and the other re-shaped pulse is linearly polarized. These two pulses are made to intersect at an angle of 90 degrees so that the combined pulse has electric field in each of the XYZ axes. Selection of the appropriate shapes for the component features of the pulses for a given material is accomplished by testing variations in the features on the material, assigning a fitness value to variants that tend to optimize a distinctive spectral response from the material, and using a genetic algorithm to select the combination of component features that enhances the distinctiveness of the response received over a typical background.

The invention discloses a power lithium battery SOC estimation method based on the self-adaptive Kalman filtering method. The power lithium battery SOC estimation method comprises the following steps:at first, according to the dynamic characteristics of a lithium ion battery, establishing a dual-polarization equivalent circuit model of the battery; then, obtaining data through testing the performance of the composite pulse power, identifying the characteristic parameter of the model, and adopting the least squares fit to obtain a relation curve of the open-circuit voltage and SOC; based on the relation curve of the open-circuit voltage and SOC and the discrete equation of a DP model, establishing a state equation and an observation equation, and substituting the state equation and the observation equation into the EFK algorithm to obtain a system matrix; and finally, adopting the modified self-adaptive extended Kalman filtering algorithm to estimate the battery SOC. With adoption of the power lithium battery SOC estimation method, the problems that the filtering results diffuse and the operation is not stable when the traditional self-adaptive Kalman filtering method or the EFK algorithm is adopted for SOC estimation are effectively solved, and the speed that the SOC estimated value is convergent to the truth value is increased.

The invention discloses a composite coating material and preparing method and equipment in the metallurgical conticaster crystallizer, which is composed of nickel-based composite material or nickel alloy composite material, which consists of base metal and large scale of particle or fiber in the base with polyphase structure, wherein the DC composite plating or composite pulse plating equipment is composed of plating power, plating groove, nickel anode or nickel alloy anode, metallurgical conticaster crystallizer, stirring device, liquid circulating device, heating and temperature-controlling device.

The invention relates to an on-line identification method for intrinsic parameters of a battery, which is characterized in that a linear neural network is constructed by using input and output data of the battery on the basis of a standard equivalent first-order RC model, current and voltage data in a composite pulse test is taken as a training set, and parameter identification is performed on an equivalent circuit model by using a neural network parameter identification method. The on-line identification method identifies each parameter of a power storage battery online conveniently and efficiently, provides model parameters for battery power estimation, and is conducive to improving control effects of a battery management system, giving full play to the performance of the storage battery and prolonging the cycle life of the storage battery.

A shift register includes a plurality of stages each outputting k composite pulses each including an A-scan pulse and a B-scan pulse. At least one stage includes an A-sub-stage for controlling a voltage at an A-set node and a voltage at at least one A-reset node in response to an external A-control signal and generating an A-carry pulse based on the voltage at the A-set node. The voltage at the at least one A-reset node and any one A-clock pulse, at least one B-sub-stage for controlling a voltage at a B-set node and a voltage at at least one B-reset node in response to an external B-control signal and generating a B-carry pulse, and a scan output controller for generating k A-scan pulses and k B-scan pulses and outputting one of the A-scan pulses and one of the B-scan pulses corresponding to each other as one composite pulse.

The invention provides a method and apparatus for parameter identification of an equivalent circuit model of a lithium ion battery. The method comprises: executing a composite pulse power characteristic test on a lithium ion battery to determine the battery-side voltage response curve; carrying out curve fitting on the battery-side voltage response curve to determine an exponential equation expression; and determining a battery-side voltage equation expression based on an equivalent circuit model of a lithium ion battery and comparing coefficients of the battery-side voltage equation expression with coefficients of the exponential equation expression to determine a battery polarization resistance and a battery polarization capacitance. According to the method provided by the invention, with a curve fitting way, identification of the battery polarization resistance and the battery polarization capacitance is realized and the computing process becomes clear and simple, so that complicated matrix computing during parameter identification in the prior art can be avoided.

The invention discloses a pulse power supply used in electric precipitation. An existing precipitator adopts a direct-current composite pulsed high-voltage power supply with a complicated circuit structure. The power supply provided by the invention comprises a direct-current high-voltage power supply circuit and a pulse high-voltage power supply circuit. The direct-current high-voltage power supply circuit is electrically connected to the precipitator. The pulse high-voltage power supply circuit and the direct-current high-voltage power supply circuit which are coupled provide power for the precipitator. The pulse high-voltage power supply circuit comprises an AC-DC converter circuit and a pulse transformer. One end of a primary side of the pulse transformer is connected to the AC-DC converter circuit through a storage capacitor, and is grounded with the other end of the primary side of the pulse transformer through an electronic switch. One end of a secondary side of the pulse transformer is connected to a joint point of the direct-current high-voltage power supply circuit and the precipitator through a high-voltage coupling capacitor, and the other end is grounded. According to the invention, the coil of the pulse transformer is utilized, and the equivalent capacitance of a precipitator electric field is utilized, such that the circuit of the power supply provided by the invention is simplified.

The present invention discloses a super rapid exchanging method compound pulse current polarity changing arc welding power supply device used for electric arc welding, which comprises a DC power supply, a full bridge transfer circuit, a control system, a drive circuit, a parallel absorbing protecting circuit and a pulse current output circuit. The parallel absorbing protecting circuit is consists of an electrolytic condenser CE, a high frequency capacitance C and a power resistor R. The pulse current output circuit consists of a second follow current inductance LP, a fifth power switch tube TP and a second power diode DP. The DC power supply comprises an assistant DC power supply, a first DC power supply and a second DC power supply. The first DC power supply is used for providing a background current, and the second DC power supply is used for supplying a peak current Tpp, and the control system adopts a DSP processor chip. The current ascension rate of the power supply equipment output polarity changing square wave current of the present invention is not less than 50A/Mus, and the rate of descent is not less than 50A/ Mus, and the current ascension rate of the compound pulse is not less than 50A/Mus, and the current ascension rate is 10 to 15 A/ Mus, and the frequency of the compound pulse is 1kHz to 30 kHz, and the duty ratio is 10 percent to 90 percent.

The invention relates to a composite high-frequency pulse welding system and process, belonging to the field of electric arc welding. The system comprises a welding power supply A, a composite pulse power supply B and a composite welding gun C, wherein a TIG (Tungsten Inert Gas Welding) power supply is selected to serve as the welding power supply A; the composite pulse power supply B consists of three parts, a composite pulse power supply power part B1, a high-frequency pulse generator B2 and a composite pulse power supply control system B3; B1 is realized by utilizing a switching power supply; B2 comprises a full bridge topological circuit, a full bridge drive circuit, a full bridge rectification circuit and a current sensor LEM2; B3 comprises a digital signal processor, a sampling processing circuit, a state judging circuit, a protective signal circuit and a current sensor LEM3; and B1 is connected with B2, B2 and A are connected with the two ends of C in parallel and simultaneously output power to C. According to the composite high-frequency pulse welding system and process, disclosed by the invention, the work is table, a randomly adjustable composite high-frequency pulse welding process with a pulse amplitude within 200A, a pulse frequency of 20-100kHz and a duty ratio of 20-80% can be realized, a welding seam structure can be effectively thinned and the number of welding seam air holes can be reduced.

The invention relates to an online estimation method for direct current resistance of a power battery of a plug-in hybrid electric vehicle or a pure electric vehicle. The online estimation method includes that in the process of charging through a vehicle-mounted charger, charging to appointed equally spaced SOC points in sequence in a constant-current charging mode, and then using a constant-voltage charging mode; when the current is reduced to an equalizing current designed by a monomer equalizer, casually opening and closing the equalizer of each monomer in sequence, using the equalizer to generate a composite pulse excitation on each monomer, recording the change curve of the terminal voltage thereof changed along with the time, substituting into a corresponding mathematical model of direct current resistance of the power battery to obtain the direct current resistance and open-circuit voltage of the battery, and calculating the direct current resistance and open-circuit voltage of a power battery pack according to the direct current resistance and open-circuit voltage of the battery. The online estimation method for the direct current resistance of the power battery of the electric vehicle is simple and reliable and has high practicability and performability.

Methods of, and systems for, simultaneously compensating for external-magnetic-field inhomogeneity as well as radiofrequency magnetic-field inhomogeneity in an MRI system. In one method embodiment, a pulse sequence is applied when the transmitter-reference frequency is delivered on resonance. The pulse sequence includes radiofrequency pulses which may be applied at arbitrary-excitation-flip angles that are not necessarily 90° degrees. The pulse sequence also includes spin-locking pulses applied in concert with a refocusing-composite pulse. In another method embodiment, a pulse sequence is applied when the transmitter-reference frequency is delivered off resonance. This off-resonance-pulse sequence includes radiofrequency pulses which may be applied at arbitrary-excitation-flip angles that are not necessarily 90° degrees. Sandwiched between the excitation-flip angles are at least two off-resonance-spin-lock pulses applied at an inverse phase and frequency from each other.

A DC composite pulse high voltage power supply for an electrostatic precipitator comprises a pulse high voltage power supply, a DC high voltage power supply and a composite circuit. Output of the pulse high voltage power supply is coupled with the composite circuit; output of the DC high voltage power supply is coupled with the composite circuit; and output of the composite circuit is connected with the electrostatic precipitator. The pulse high voltage power supply provided by the invention is treated with voltage regulation, voltage boost and rectification by a three-phase power supply; andthe high voltage pulse is generated under the control of an electronic switch through the primary resonance of capacitor and transformer. The invention solves the problem that low peak voltage and average value voltage of the precipitator easily lead to back corona in the prior power supply technology. According to the invention, the DC high voltage and pulse high voltage are combined together toform the composite pulse voltage, so as to increase the peak voltage of the precipitator, accelerate the driving velocity of dust, prevent the occurrence of back corona, realize energy saving and improve dust collection efficiency; besides, the invention has good social and economic benefits.

The invention discloses an intelligent regeneration and restoration method of an industrial storage battery. The method comprises the following steps: 1, carrying out apparatus detection: detecting the residual voltage, the specific gravity and the internal resistance of the storage battery, discarding or further processing monomers with detected parameters being lower than corresponding preset values, splicing monomers with the detected parameters being high higher than or equal to the preset values to form a storage battery packet, and completely and fully charging the storage battery packet; 2, carrying out constant current discharging: setting a voltage value, a capacity value and a discharge rate value according to the specifications of the qualified storage battery packet, feeding detection data back to an intelligent analyzer in real time, and judging the status of every monomer; 3, intelligently restoring: applying an instantaneous high voltage to the storage battery packet through an intelligent positive and negative pulse variable frequency restoration circuit, limiting the current value, and setting an enough short pulse width and an enough large duty ratio, wherein the restoration time is 20-60h; and 4, carrying out constant current discharging: fully charging restored batteries, and testing the fully charged restored batteries. The method is a positive and negative harmonic wave low-voltage and high-current composite pulse method, generates tiny degassing, and allows the capacity of the restored batteries to reach 85% or above of the nominal capacity.

The system for treating a region of the epidermis, comprising: —at least one laser energy source; —a time control device to generate a laser beam; —a laser energy focusing system arranged and produced to direct a laser beam on said region of the epidermis. The control device generates a laser beam comprising a plurality of composite pulses, emitted at a base frequency, each composite pulse comprising a sequence of sub-pulses at a higher frequency than said base frequency.

The invention discloses a method for electric-field-induced cell fusion based on composite pulse. The method comprises the following steps that firstly, cells different in size and a fusion liquid are placed in a cell culture tank; secondly, sine alternating voltage is applied to the two poles of the cell culture tank, and the cells are arrayed and tightly attached to each other; thirdly, the sine alternating voltage applied to the two poles of the cell culture tank is switched into nanosecond impulse voltage through a switch, the minute electroporation of the cells in the tank occurs; fourthly, the nanosecond impulse voltage continues to be switched into microsecond impulse voltage through the switch so as to act on the in-tank cells in the electroporation state, and the size of holes in the cells in the opening state is further increased, the outer membranes of the two cells tightly attached to each other are connected with each other, genetic materials in the two cells are mutually fused, and finally an intestinal fused cell is formed.

A polishing solution disclosed by the present invention is composed of the following components according to mass percentage: component A: (NH4)2SO4 aqueous solution with a concentration of 1% to 10%, component B: ethylene glycol with a concentration of 0.2% to 3% One or a combination of amine tetraacetic acid, ammonium citrate, sodium tartrate or sodium oxalate. The method of using the polishing liquid to carry out non-equilibrium liquid compound pulse plasma polishing, first prepare the polishing solution according to the above formula, then put the workpiece to be treated into the above prepared polishing liquid, add a compound electric pulse or an equivalent different Combination of positive and negative pulses, control positive pulse frequency 0.5-80kHz, duty cycle 5%-95%, voltage 200-480V, make the reaction in the most violent state, treatment for 1-5 minutes, that is to complete the polishing process. In the present invention, pulses are used instead of direct current, which is beneficial to the generation of plasma, so that the discharge plasma can obtain higher kinetic energy, better mirror effect and faster polishing speed.