152 results about "Ac impedance" patented technology

The invention discloses a high-power alternating-current impedance excitation circuit, a control method thereof and an electrolysis test system, and belongs to the technical field of power supplies and power electronics, the circuit is used as an alternating-current power supply in a high-capacity electrolysis test power supply, and the circuit is controlled by a controller to output an alternating-current signal so as to carry out an impedance test on an electrolytic bath. Compared with a full-bridge circuit, the alternating-current impedance excitation circuit adopts the multi-level converter, so that the output current harmonic content is low, the electrolysis efficiency is improved, the equipment loss is reduced, the economical efficiency of an electrolysis system is improved, stable operation of an electrolytic bath is ensured, and electrolysis interruption or faults caused by voltage fluctuation are reduced.

The invention relates to the technical field of charge and discharge detection, and discloses a multichannel EIS charge and discharge in-situ test system and method, and the system comprises a DC charge and discharge module which is used for carrying out the constant-current, constant-voltage or cyclic charge and discharge test of a battery; the alternating current impedance test module is connected in parallel with the direct current charging and discharging module and is used for applying an alternating current disturbance signal to the battery and collecting impedance response in the charging and discharging process; and the unified clock module is used for providing a synchronous triggering reference signal for the direct current charging and discharging module and the alternating current impedance test module. The direct current charging and discharging module and the alternating current impedance test module are designed to be of a parallel connection normally-connected structure, no relay switching is needed, continuous and uninterrupted online EIS test in the charging and discharging process is achieved, contact resistance drift and transient errors caused by physical circuit switching in a traditional scheme are effectively avoided, and the reliability of the EIS test is improved. And the stability and repeatability of the test are obviously improved.

The invention relates to a high-precision temperature detection system based on an alternating-current impedance bridge. The high-precision temperature detection system comprises a double-resistance bridge circuit, a lock-in amplifier and a differential circuit, the double-resistor bridge circuit comprises a resistive temperature sensor and a standard resistor which are connected in series, and the phase-locked amplifier is a digital phase-locked amplifier realized based on an FPGA (Field Programmable Gate Array). Wherein the initial potential of a first voltage measurement end arranged at the midpoint of the double-resistor bridge circuit is zero by adjusting the two excitation signals which are loaded to the double-resistor bridge circuit and have the same frequency and opposite phases before temperature measurement; in the temperature measuring process, the lock-in amplifier detects the potential of the first voltage measuring end and the voltage at the two ends of the standard resistor through the differential circuit, then the resistance value of the resistance-type temperature sensor is calculated by combining the resistance value of the standard resistor, and then the temperature of the resistance-type temperature sensor is reduced. According to the invention, the anti-interference capability can be improved, and the measurement precision of 0.1 mK level can be reached near 273K.

The invention provides a non-isolated LED power supply minuteness-removing turn-off circuit, which comprises a second power supply processing module, a minuteness-removing turn-off module and an LED lamp module, and is characterized in that the second power supply processing module is used for converting a high-voltage direct-current power supply into an LED lamp module working power supply; the micro-brightness removal turn-off module is arranged between the output end of the second power supply processing module and the LED lamp module and comprises a direct-current impedance conversion unit, an alternating-current impedance conversion unit and a switching tube, and the switching tube is arranged on a direct-current loop; and the control unit of the second power supply processing module reduces the DC voltage and the non-isolated AC induced voltage to be below the set voltage through the switching signal and the DC impedance conversion unit and the combined action of the switching signal and the AC impedance conversion unit, thereby realizing the minuteness-removing turn-off of the LED lamp module. According to the invention, contactless switch control can be realized, circuit loss is reduced, and working noise is reduced.

A device includes an AC impedance circuit to apply an AC excitation signal to a set of battery cells of a battery pack. The device includes a controller to determine a battery pack identification (ID) value from a battery pack identification (ID) circuit of the battery pack, calculate an impedance value of the battery pack based on the AC excitation signal, identify a maximum charging rate to charge the battery pack using the battery pack ID value of the battery pack and the impedance value of the battery pack, where the battery pack is one of at least two battery packs having a same battery pack ID value with different maximum charging rates, and set a charging rate to charge the battery pack using the maximum charging rate.

A battery pack includes a set of blocks of battery cells, where each of the blocks is connected in series, and a set of AC impedance circuits, where each of the AC impedance circuits is electrically connected to at least one of the blocks of battery cells in the set of blocks of battery cells to apply an AC excitation signal to the at least one of the blocks in the set of blocks. The battery pack includes a controller configured to: calculate an impedance value for each of the at least one of the blocks of battery cells based on the AC excitation signal applied to each of the at least one of the blocks of battery cells, and adjust a parameter of the battery pack based on the calculated impedance value for each of the at least one of the blocks of battery cells.

A computer-implemented method for Li-plating detection of a cell of a power battery. The method includes: obtaining a plurality of AC impedance values for the cell measured at a plurality of States of Charge (SOCs), in which the plurality of AC impedance values are measured in a non-driving state of a vehicle; fitting the AC impedance values as a function of SOC based on the plurality of AC impedance values; and calculating a goodness of fit for the function, and calculating a Li-plating score for the cell based on the goodness of fit, in which the Li-plating score is used to indicate a degree to which Li-plating occurs in the cell.

The invention relates to the technical field of lithium battery charging equipment, in particular to an overcharge protection lithium battery charger which comprises a shell, a charging protection board circuit and an output power port. The charging protection board circuit is provided with a monitoring protection module, a mechanical protection module and a logic control module. The monitoring protection module accurately identifies an overcharge abnormal state by measuring a lithium battery AC impedance spectrum in real time, and rapidly triggers the electronic protection unit to execute a cut-off action. And if the electronic protection fails, the mechanical protection module acts quickly, and the charging loop is physically disconnected. The logic control module coordinates automatic switching of the two protection modes, and the intelligence and reliability of protection are improved. The lithium battery charger is simple and reasonable in structure, high in monitoring sensitivity and rapid and reliable in protection action, has a perfect redundancy protection structure and a convenient reset mechanism, effectively overcomes the defects in the prior art, and remarkably improves the safety performance and reliability of the lithium battery charger.

The present invention relates to the field of measurement application technology, and in particular to a high-precision AC impedance test device, comprising a tester, wherein a power control component is fixedly connected to the top of the tester, wherein the power control component comprises a cover plate and a fixing seat, wherein the cover plate is fixedly connected to the top of the fixing seat, wherein the fixing seat is fixedly connected to the tester, wherein the middle portion of the cover plate is rotatably connected to an anti-false touch member, wherein both sides of the bottom of the cover plate are fixedly connected to support rods, wherein the bottom between the two support rods is fixedly connected to an arc rod, wherein both sides of the top of the arc rod are provided with a penetrating arc groove, and further comprising a control method for a high-precision AC impedance test device. The present invention rotates and presses the anti-false touch member, wherein the output end of the anti-false touch member can be accurately slid into the arc groove, and the press switch is operated. Compared with the existing control switch, the possibility of false operation is reduced, and the use of the tester is facilitated.

A battery impedance measuring device 1 measures the AC impedance of a battery pack 3. FETs 5 and 6 are arranged in a path through which an excitation current flows from the battery pack 3, and a shunt resistor 7 is energized with the excitation current through the FETs 5 and 6. An excitation current control unit 13 and a diagnosis control unit 14 control the turning on and off of the FETs 5 and 6, respectively, and a current detection circuit 15 measures the voltage of the shunt resistor 7. An error determination circuit 16 diagnoses the conduction state of the FETs 5 and 6, on the basis of the on / off state of the FETs 5 and 6 controlled by the control units 13 and 14 and the result of energization of the shunt resistor 7.

The application discloses a simplification construction method of a high-frequency impedance theoretical model of a flexible DC converter station, and comprises the following steps: obtaining data information of a target flexible DC converter station; calculating positive and negative sequence electrical quantity data information of the target flexible DC converter station; adopting a harmonic state space method to construct an alternating current impedance theoretical model of the target flexible DC converter station; simplifying the constructed model at a high frequency; uniformly performing frequency shift representation on positive and negative sequence impedances of the target flexible DC converter station; and completing the simplification construction of the high-frequency impedance theoretical model of the target flexible DC converter station. The application further discloses a system for realizing the simplification construction method of the high-frequency impedance theoretical model of the flexible DC converter station. The application not only realizes the simplification construction of the high-frequency impedance theoretical model of the flexible DC converter station, but also has better accuracy and higher reliability, and the modeling process is simpler.

A battery module includes n batteries, n≥3. The n batteries are stacked in a sequence along a thickness direction of the battery, and m is defined as a round number of n / 2, and the first battery and the m-th battery satisfy at least one of the following conditions: a1: a capacity of the m-th battery is greater than that of the first battery; b1: under a same state of charge, an open circuit voltage of the m-th battery is less than that of the first battery; and c1: under a same state of charge, an AC impedance of the m-th battery is less than that of the first battery.

The invention discloses a high-precision multi-channel data acquisition method, relates to the technical field of multi-channel data acquisition, and is used for solving the problem that the risk of beam mode distortion caused by pumping current fluctuation is increased. Pumping current is acquired in a laser cavity to calculate a fluctuation coefficient, and an alternating-current impedance amplitude is acquired in combination with impedance detection; carrying out standardized multiplication to generate an electric strength coefficient, calibrating a statistical coefficient in time to obtain a reference threshold value, calling a gain factor, obtaining a light beam radius variable quantity by using an extra-cavity detector, calculating a down-regulation ratio to obtain a down-regulation threshold value, comparing the electric strength coefficient with the down-regulation threshold value, and if a light beam mode is distorted, carrying out standard multiplication; if yes, triggering the multi-channel wavefront sensing array to collect information and check triggering consistency, and if not, correcting a current fluctuation coefficient based on light beam intensity, combining impedance to generate an update coefficient, comparing the update coefficient with a down-regulation threshold value, and if the update coefficient exceeds the limit, triggering an alarm and outputting a protection instruction; and beam mode distortion caused by pumping current fluctuation is effectively avoided.

The present invention relates to a method for accurately measuring the chloride ion content of the rust layer on the surface of a bronze object. The method comprises the following steps: mixing water-soluble CS, ALg, and PVA, adding AgNO3 dropwise, stirring to form a homogeneous sol, heating at 50°C to form a cross-linked gel, and obtaining an ALg-CS-Ag hydrogel; preparing artificial rust powder; cutting the hydrogel into small pieces and adding each piece to the rust powder, ensuring that one side of the hydrogel is in full contact with the rust powder for adsorption; simultaneously attaching ALg-CS-Ag hydrogel pieces of the same size to the surface rust layer of a bronze object fragment for adsorption; waiting for 21-27 hours, removing or peeling off the adsorbed hydrogel; soaking the hydrogel in deionized water until it is completely swollen; performing an AC impedance test and fitting the test results to an equivalent circuit to obtain a resistance value; plotting a relationship between the inverse of the resistance value and the chloride ion concentration and performing a linear fit to obtain a fitting function, which is substituted into the fitting function to calculate the chloride ion content of the rust layer on the surface of the bronze object. The method has the advantages of being non-destructive, highly accurate, and convenient and rapid.

The invention discloses a multifunctional tester for electric power new energy electrical equipment, and relates to the technical field of new energy electrical multifunctional tests. The multifunctional tester for the electric power new energy electrical equipment comprises a tester main body, a protective shell and a protective cover, the upper surface of the tester main body is fixedly connected with a direct-current voltage measurement digital display meter, a direct-current measurement digital display meter, an alternating-current voltage measurement digital display meter, an alternating-current measurement digital display meter, a power supply display lamp, a working position display lamp, a zero position display lamp and an alternating-current and direct-current conversion switch, and the interior of the tester main body is fixedly connected with an isolation voltage regulator. The top of the isolation voltage regulator is provided with an adjusting knob, the upper surface of the tester main body is provided with a power jack and a wiring hole, and the inner surface of the protection housing is fixedly connected with a first elastic plate and a second elastic plate, thereby solving the blank field of no test instrument for the AC impedance of the wind driven generator rotor, and enabling the test work difficulty of a new energy station to be simplified.

The present application relates to a kind of taste sensor based on electrical signal, preparation method and its detection method.Taste sensor device structure is constituted by one metal / metal oxide functional electrode and three Ag / AgCl electrodes deposited on substrate, wherein metal layer and Ag electrode are deposited on substrate by evaporation deposition, and metal oxide functional layer and AgCl layer are formed on it by electrochemical method, and taste simulation and identification function are realized by measuring the potential between metal / metal oxide functional electrode and Ag / AgCl electrode and the conductance and alternating current impedance between the other two Ag / AgCl electrodes.The taste sensor of the present application has the characteristics of simple preparation process, fast measurement response and wide application, etc.

The present application provides an aerosol generation system and a control method. The aerosol generation system comprises: a susceptor for heating an aerosol-generating substrate to generate an aerosol; an LC oscillator comprising an induction coil and a capacitor, the LC oscillator being configured to guide an alternating current to flow through the induction coil, thereby driving the induction coil to supply energy to the susceptor so that the susceptor heats the aerosol-generating substrate; and a controller programmed to determine an alternating-current impedance of the susceptor by means of a resonance voltage of the LC oscillator, and further programmed to determine the temperature of the susceptor by means of the alternating-current impedance of the susceptor. According to the aerosol generation system, the working temperature of the susceptor is controlled by means of detecting the alternating-current impedance of the susceptor during operation.

The invention relates to the technical field of solid oxide electrolytic cell hydrogen production, and particularly discloses a control system and method of SOEC equipment for producing hydrogen by electrolyzing water. The system comprises a multi-frequency impedance acquisition unit and a dynamic interval matching and cooperation controller. The method is characterized by comprising the following steps of: synchronously acquiring alternating-current impedance parameters of different frequency bands for representing an electrolyte body phase state and an electrode interface state; dynamically determining an optimized operation interval in a multi-dimensional impedance state space according to the real-time direct-current working state of the electric pile; a cooperative control instruction is generated by comparing the relative positions of the impedance parameter and the dynamic interval, and meanwhile, a direct-current power supply, a heating device and a gas supply device are adjusted according to differential weights to drive the state of the galvanic pile to enter and be kept in the target interval. According to the method, the internal comprehensive state of the electric pile is directly reflected by using the impedance parameter, global and rapid adaptive cooperative control is realized, and the operation efficiency, stability and durability of the SOEC system can be improved.

The embodiment of the present application discloses an alternating current impedance processing circuit, a signal collection method and device based on the alternating current impedance processing circuit, a fuel cell voltage inspection instrument and a medium, wherein the alternating current impedance processing circuit comprises: at least two frequency selection modules in series, wherein the input end of the first frequency selection module is used as the input end of the alternating current impedance processing circuit, and is used for connecting an excitation signal; the output end of the alternating current impedance processing circuit is connected with an external control circuit through a gating switch; the external control circuit is used for selecting a corresponding target frequency band according to the frequency of the excitation signal, and controlling the gating switch to be opened for signal collection; wherein each frequency selection module comprises: a low-pass filter unit, a high-pass filter unit connected with the low-pass filter unit, and a signal amplification unit connected with the high-pass filter unit. By adopting the above technical scheme, the frequency range processed by the circuit is wider, and the gain of the circuit does not need to be fixed-point calibrated in the full-range frequency band.

An impurity detection support device includes: a pipe; a pair of electrodes; a power supply unit that applies an AC voltage with a frequency fixed at a predetermined operating frequency or superimposes an AC current with a frequency fixed at the operating frequency between the pair of electrodes; a measurement unit that measures a current or a voltage generated between the pair of electrodes; and a calculation unit that calculates a resistance of the liquid under test using a measurement result of the measurement unit. The operating frequency is determined based on a resistance of the liquid under test or a resistance of a reference solution not containing impurities measured by AC impedance method.

The application discloses a nickel-based Prussian blue battery positive electrode material and a preparation method and battery thereof, and belongs to the technical field of batteries, wherein the preparation method of the nickel-based Prussian blue battery positive electrode material comprises the following steps: dissolving sodium citrate into a nickel chloride solution to obtain reagent A; dissolving sodium ferrocyanide in water to prepare a solution to obtain reagent B; dissolving polyvinylpyrrolidone in a sodium chloride solution to obtain reagent C; simultaneously and slowly adding the reagent A and the reagent B into the reagent C to obtain a suspension liquid and aging the suspension liquid; centrifugally separating the suspension liquid after aging, washing, drying and grinding to obtain the nickel-based Prussian blue battery positive electrode material; and the nickel-based Prussian blue battery positive electrode material prepared by the application has the characteristics of high capacity, low alternating current impedance and high long cycle stability, and has excellent electrochemical performance.

An estimation device 55 estimates an internal state of a cell 61 on the basis of an AC impedance characteristic of a diffusion region of the cell 61, the AC impedance characteristic being obtained from a response made while an AC signal is applied to the cell 61 via a power line L for DC charging / discharging purposes.

The invention relates to the technical field of generators, in particular to a generator rotor alternating current impedance testing device and method.The device comprises a box body and an intelligent panel, and the intelligent panel comprises a power supply used for supplying power to the generator rotor alternating current impedance testing device; the power supply output end is used for providing working voltage; the switch assembly is used for controlling the working state of the device. The display assembly is used for displaying AC impedance test data; the voltage regulating assembly is used for regulating the current output voltage; the box body comprises a current acquisition assembly used for acquiring a current signal; the voltage acquisition assembly is used for acquiring a voltage signal; the isolation voltage regulation assembly is used for providing an adjustable alternating current power supply; and the processing assembly is used for calculating AC impedance test data according to the collected current signal and voltage signal. Therefore, the problems that equipment is heavy, wiring is tedious, operation is not safe and multi-person cooperation is needed in a traditional generator rotor alternating current impedance testing method are solved, and intelligent, portable and integrated generator rotor alternating current impedance testing is achieved.

The application discloses a lithium precipitation detection method and device based on relaxation diffusion capacitance of energy storage battery, and belongs to the technical field of online safety detection of energy storage lithium ion battery. The method comprises the following steps: performing two electrochemical impedance spectrum tests at certain intervals in the relaxation time at the end of charging; exciting AC current by an energy storage converter; extracting voltage response and calculating AC impedance by a battery management system; comparing the change rate of diffusion capacitance of the two AC impedances based on a battery impedance model with a threshold value; and finally obtaining a lithium precipitation judgment result. The application captures the electrochemical impedance spectrum in the rest time at the end of battery charging, extracts the low-frequency diffusion capacitance and its change rate to diagnose lithium precipitation, improves the lithium precipitation detection sensitivity, realizes online, intelligent and accurate lithium precipitation state diagnosis of the energy storage lithium ion battery, and provides an effective basis for the safe operation of the power station.

The invention relates to a battery management apparatus, a battery management method, and a control program product. A battery management device according to the present disclosure includes: a temperature detection unit configured to detect a temperature of a lithium ion secondary battery; a high-frequency signal supply unit configured to supply a high-frequency signal of 0.1 MHz or more to the lithium ion secondary battery; an impedance detection unit configured to detect a value of a real part of AC impedance from the lithium ion secondary battery to which the high-frequency signal has been supplied; a calculation unit configured to calculate an amount of Li deposition in the lithium ion secondary battery from a value of a real part of the detected AC impedance; and a control unit configured to control an allowable charging power of the lithium ion secondary battery and control an upper limit temperature of the lithium ion secondary battery based on the calculated Li deposition amount in the lithium ion secondary battery.

The invention discloses a method for rapidly screening the high-temperature stability of a ternary layered positive electrode material of a lithium battery, and belongs to the technical field of material detection. The method provided by the invention comprises the following steps: preparing a ternary layered positive electrode material into a positive electrode, and matching with a negative electrode to assemble a battery; analyzing the alternating current impedance of the battery placed at high temperature for different time, and calculating to obtain an impedance change rate; observing the thickness of the SEI film on the surface of the ternary layered positive electrode material; speculating the high-temperature stability of the ternary layered positive electrode material according to the impedance change rate and the SEI film thickness change; and the ternary layered positive electrode material with small impedance change rate and small SEI film thickness change has good high-temperature stability. The method provided by the invention is stable and reliable, can evaluate the high-temperature stability of the ternary layered positive electrode material in a short time and screen out a high-quality material, and is simple, economical, rapid, efficient and easy to popularize and use.

The invention provides a measuring circuit and a measuring system for alternating-current impedance of a battery cell, and the measuring circuit comprises a low-pass filtering unit which receives a digital excitation signal and carries out the low-pass filtering of the digital excitation signal; the voltage and current conversion unit is connected to the output end of the low-pass filtering unit, converts the voltage signal output by the low-pass filtering unit into a current signal and applies the current signal to the two ends of the battery cell; the high-pass filtering unit is connected to the two ends of the battery cell and is used for filtering a direct current part of a voltage signal acquired at the two ends of the battery cell and retaining an alternating current part; and the signal processing unit is connected to the output end of the high-pass filtering unit and is used for converting an output signal of the high-pass filtering unit into a digital signal and calculating the alternating-current impedance of the battery cell. The measuring circuit and the measuring system for the alternating current impedance of the battery cell are simple in circuit structure and high in accuracy.

To provide a method for detecting changes in the state of the electrolyte contained in a lithium-ion battery without damaging the lithium-ion battery. [Solution] A method for detecting changes in the state of the electrolyte contained in a lithium-ion battery, which detects changes in the state of the electrolyte contained in the lithium-ion battery based on the amount of change dZ of the ZF curve obtained by plotting the actual axial resistance Z, which is obtained by the AC impedance method of the lithium-ion battery, against the voltage frequency F, and the resulting change in the state of the electrolyte contained in the lithium-ion battery.

The utility model discloses a transformer winding structure, which relates to the technical field of transformers, and comprises a magnetic core, a main winding and an auxiliary winding, the main winding is wound on the periphery of the magnetic core in a single-layer fitting manner by adopting a single-strand multi-core wire, the auxiliary winding is wound on the periphery of the main winding side by side by adopting N-strand multi-core wires, and N is an integer greater than or equal to two. According to the utility model, the main winding adopts the single-strand multi-core wire, under the condition of the same cross section area, the number of turns of the single-strand winding is less than that of the multi-strand winding, and the inductance is correspondingly reduced, so that the alternating-current impedance is reduced, and the energy conversion performance of the transformer is improved; according to the secondary winding, N strands of multi-core wires are adopted, under the condition of the same cross sectional area, compared with a single strand, the multi-strand wires increase the conductor surface area through which current flows, loss caused by the skin effect can be remarkably reduced, meanwhile, the current density is effectively dispersed, and the heat dissipation capacity is improved. The secondary winding is wound on the periphery of the main winding, mutual inductance interference between the secondary winding and the main winding can be effectively reduced, energy loss is reduced, and the energy conversion efficiency is further improved.

To provide a battery management device, a battery management method, and a control program that enable efficient and low-cost charging of lithium-ion secondary batteries. [Solution] The battery management device according to this disclosure includes a high-frequency signal supply unit that applies a high-frequency signal of 0.1 MHz or higher to a first battery cell having a low battery temperature among a plurality of battery cells constituting a lithium-ion secondary battery; an impedance detection unit that detects the actual AC impedance of the first battery cell to which the high-frequency signal has been applied; and a determination unit that determines whether or not Li has been deposited in the lithium-ion secondary battery based on the actual AC impedance of the first battery cell.