153 results about "Equivalent series resistance" patented technology

The invention discloses an MMC sub-module fault processing method, device and equipment and a storage medium, and the method comprises the steps: obtaining the capacitor voltage value of a sub-module of an MMC and the bridge arm current value of the sub-module, the MMC comprises six bridge arms of three phases, each bridge arm comprises a plurality of sub-modules, the capacitor of each sub-module is connected with an equivalent series resistor in series, and further, the equivalent series resistor is connected with the capacitor voltage value of the sub-module of the MMC; the resistance value of an equivalent series resistor in the sub-module is monitored through the capacitor voltage value and the bridge arm current value, if the resistance value of the equivalent series resistor is higher than a preset resistance value, it is determined that the capacitor of the sub-module fails, fault-tolerant control is carried out on the sub-module through a voltage-sharing and circulating current suppression algorithm, a three-phase switching signal is output, and the three-phase switching signal acts on the MMC. Therefore, the circulating current fundamental frequency component and the double frequency component caused by fault-tolerant control after the fault can be eliminated through the circulating current suppression strategy, the effect of circulating current suppression is achieved, and the stability of system fault operation is improved.

The invention discloses a super capacitor energy storage life evaluation method under a fire storage frequency modulation working condition, relates to the technical field of power system energy storage, and can at least partially solve the problems that an existing super capacitor life evaluation method is poor in adaptability to the frequency modulation working condition, insufficient in multi-factor coupling quantization and lack of engineering criteria. The method comprises the steps of simulating a fire storage frequency modulation working condition and collecting multi-dimensional operation data of a super capacitor; preprocessing the collected data and extracting life characteristic parameters such as capacity attenuation rate, equivalent C rate, average temperature rise, frequency modulation load factor and the like; key influence factors are screened through correlation analysis, weight coefficients are trained through a machine learning algorithm, and a coupling influence coefficient model is constructed; establishing a capacity attenuation equation, an equivalent series resistance growth equation and a response delay growth equation, and fusing three criteria to determine a life end point; and dynamically correcting model parameters based on the real-time frequency modulation data and calculating the residual life. Accurate evaluation and dynamic prediction of the service life of the super capacitor under the fire storage frequency modulation working condition are achieved.

The invention discloses a low-dropout linear voltage regulator which is totally divided into three parts, the first part is an error amplifier, and it is guaranteed that the output voltage of the low-dropout linear voltage regulator is kept unchanged under different load currents; the second part is a source following current output stage, the output current is divided into two branches, one branch is supplied to the base electrode of an NPN triode, and the other branch is supplied to a first NMOS tube connected with a diode; and the third part is a zero point tracking part, the principle of the zero point tracking part is to obtain a current which is proportional to the current flowing to the base electrode of the NPN triode so as to obtain a zero point, and the frequency of the zero point is increased along with the increase of the load current for frequency compensation. The three parts, a power NPN triode, a partial pressure feedback resistor and a plug-in capacitor form a whole circuit. According to the invention, the driving current can reach the ampere level, the requirement of the whole circuit on the value of the equivalent series resistance of the external capacitor is reduced, and the resistance value range of the equivalent series resistance of the external capacitor is expanded.

The invention discloses a super-capacitor module voltage balancing method and device, a terminal and a medium, and the method comprises the steps: collecting the terminal voltage value of each single capacitor in a super-capacitor module according to a to-be-balanced super-capacitor module; then, according to the terminal voltage value, constructing a time-varying fractional order capacitor model to accurately describe the non-ideal characteristics of the super capacitor, and obtaining an adaptive parameter set comprising a fractional order parameter, an equivalent series resistance parameter, a capacitor capacity parameter and an aging factor parameter in combination with historical equilibrium data; and then a differential game decision-making device is adopted to carry out multi-target collaborative optimization on capacitance balance, power grid reactive power demand and energy consumption limitation, and a current instruction considering capacitance balance, power grid support and energy consumption constraint is dynamically generated by solving Nash equilibrium points of three optimization targets, so that precise balance of the voltage of the super-capacitor module is realized, and the accuracy of the voltage balance of the super-capacitor module is improved. The technical problem of insufficient model precision in a traditional strategy is solved, and the reliability of the system under complex working conditions is improved.

The invention provides a method for predicting the service life of an electrolytic capacitor, which comprises the following steps of: taking environment temperature, operation time and equivalent series resistance (ESR) which is calculated based on ripple voltage and ripple current and is subjected to temperature compensation as input data, and taking the residual service life RUL of the electrolytic capacitor as a label; according to the failure mechanism of the electrolytic capacitor, when the ESR is increased to two times of the initial value of the ESR, it is indicated that the electrolyte is obviously lost, the capacitor fails to form a failure threshold value, and based on the failure threshold value, the RUL corresponding to each time point in historical monitoring is reversely deduced in combination with operation time data; then, performing normalization processing on the multi-source heterogeneous data to eliminate dimensional differences, and constructing a standardized data set suitable for model training; training and evaluating the model to obtain a model with residual life prediction capability; according to the technical scheme, the problem that the capacitor core temperature and the online electrolytic capacitor capacitance value required by traditional electrolytic capacitor life prediction are difficult to obtain is solved, and the engineering problem of electrolytic capacitor life prediction is solved.

The invention discloses a capacitor implosion risk analysis method and system based on time sequence characteristics, and relates to the technical field of risk analysis, and the method comprises the steps: collecting the current, temperature and equivalent series resistance data in the operation process of a capacitor, and constructing an operation parameter time sequence data set; first-order instant change features are extracted in each time window, and second-order time sequence features are obtained based on continuous window analysis; identifying abnormal change features and counting occurrence times, duration and multi-parameter joint modes to form an enhanced implosion risk representation vector; and classifying each time window based on implosion risk characteristics, judging implosion risks to be low, medium and high levels, and generating a detailed risk early warning sequence and corresponding processing suggestions. According to the method, multi-parameter and multi-time-dimension continuous risk analysis and graded early warning can be realized, the operation safety of the capacitor is effectively improved, implosion accidents are prevented, and the overall risk management and control efficiency is improved.

The invention discloses a capacitor on-line monitoring method based on a time-frequency domain joint model. The method is suitable for DC-Link capacitor state evaluation of power electronic equipment. Capacitive current is dynamically reconstructed through port current of an active inductor and a switching signal, and dependence on a special sensor is eliminated. An equivalent series resistance (RESR) is calculated based on a power loss model in a time domain, a 300Hz harmonic component is combined in a frequency domain to decouple a capacitance value, and synchronous high-precision monitoring of the RESR and the capacitance value is achieved. Simulation and experiments show that the RESR monitors error lt; 4%, capacitance error lt; and the monitoring period can be shortened to 30ms. According to the method, a main circuit does not need to be transformed, the method can be deployed in a DSP controller in an embedded mode, and a real-time non-intrusive state monitoring solution is provided for equipment such as an active inductor and a frequency converter.

The embodiment of the invention provides a wind power converter DC bus capacitor state monitoring system and method, and the method comprises the steps: firstly introducing a physical model of a capacitor temperature, and carrying out the decoupling compensation of a preliminarily estimated equivalent series resistor, so as to effectively strip the measurement disturbance caused by the fluctuation of an operation temperature; on the basis, working condition data such as active power of the converter are further fused, and a health baseline capable of being dynamically and adaptively adjusted along with the operation working condition is established as a judgment standard. And finally, comparing the equivalent series resistor subjected to multiple correction with the self-adaptive healthy baseline in real time, so as to accurately identify inherent performance degradation caused by self aging of the capacitor. In this way, interference of complex and changeable working conditions on monitoring results can be overcome, and therefore the accuracy and reliability of state evaluation are remarkably improved.

The invention belongs to the field of paper for aluminum electrolytic capacitors, and particularly relates to a high-voltage-resistance and high-liquid-absorption composite electrolytic capacitor diaphragm and a preparation method thereof. The diaphragm is formed by compounding at least two layers of high-density base paper, and intermittent point-like bonding is carried out between the base paper through a hydrophilic high-molecular polymer according to the surface coating area of 10-40% and the gluing amount of 0.1-10g / m, so that the pore structure between the paper is reserved while the breakdown voltage is ensured to be increased, the liquid absorption capability is remarkably improved, and the equivalent series resistance (ESR) is reduced. The high-pressure diaphragm solves the problem that pressure resistance and liquid absorption performance of an existing high-pressure diaphragm are difficult to consider, and has the advantages of being simple in structure, excellent in electrical performance, suitable for large-scale production and the like.

The invention discloses a capacitor health degree detection method and equipment, and the method comprises the steps: applying a sine wave test signal to a to-be-detected capacitor, obtaining a current signal and a voltage signal of the to-be-detected capacitor, calculating the phase angle of the to-be-detected capacitor through the current signal and the voltage signal, calculating the equivalent series resistance and capacitive reactance of the to-be-detected capacitor based on the phase angle, and obtaining the health degree of the to-be-detected capacitor. And calculating the capacitance of the to-be-measured capacitor based on the capacitive reactance, calculating the loss tangent value of the to-be-measured capacitor according to the equivalent series resistance and the capacitive reactance, and predicting the health degree of the capacitor according to the equivalent series resistance, the capacitance value and the change of the loss tangent value. Therefore, when the capacitor operates normally, current and voltage signals of the capacitor can be measured actively, and the health degree of the capacitor can be calculated by combining the equivalent series resistance, the capacity and the loss tangent value of the capacitor, so that the health condition of the capacitor can be evaluated more accurately and comprehensively, and early warning and troubleshooting can be carried out on the abnormal capacitor as soon as possible.

To provide a multilayer electronic component that offers excellent heat dissipation performance while also possessing superior mechanical strength and equivalent series resistance (ESR) characteristics. [Solution] A stacked electronic component according to one embodiment of the present invention includes a body 110 including a dielectric layer 111 and internal electrodes 121 and 122 arranged alternately with the dielectric layer, external electrodes 130 and 140 arranged on the body and connected to the internal electrodes, and interface layers 151 and 152 arranged between the body and the external electrodes, wherein the interface layers include an oxide containing a crystalline conductive metal. A plurality of interface layers are arranged, and the plurality of interface layers are spaced apart from each other in a direction in which the dielectric layer and the internal electrodes are arranged alternately.

A method for producing an electrolytic capacitor, the electrolytic capacitor including a capacitor element including an anode body and a cathode body each having a foil shape. The anode body includes a dielectric layer on a surface of the anode body. The method includes a step of forming a capacitor element precursor by winding or stacking a separator, the anode body, and the cathode body with the separator interposed between the anode body and the cathode body, a step of impregnating the capacitor element precursor with a treatment liquid containing a polyhydric alcohol, a solvent, and a conductive polymer component, a step of impregnating the capacitor element precursor with a liquid component after the step of impregnating the capacitor element precursor with the treatment liquid, and a step of forming the capacitor element by eluting the polyhydric alcohol into the liquid component.

The present disclosure provides an integrated circuit device in which a capacitor is connected between two vias through a passivation stack to couple a power supply contact to a metal interconnect structure. By providing enough high capacitance and enough low equivalent series resistance for the capacitor, the noise in the power supply can be effectively filtered. The capacitor may have a trench capacitance structure as part of a solution for providing sufficiently high capacitance. Placing all or part of the capacitor within the passivation stack allows the capacitor to be implemented without moving the wiring or device in the metal interconnect structure.

An embodiment of the present invention discloses a high-frequency equivalent circuit, a modeling method and a modeling device for the high-frequency equivalent circuit. The circuit includes: an equivalent resistor, an equivalent capacitor and a drain parasitic inductor connected in series, and is connected in parallel with an absorption circuit formed by connecting a parasitic inductor, an absorption resistor and an absorption capacitor in series, and then connected in series with an upper transistor conduction equivalent resistor, a power loop parasitic inductor, a DC link equivalent series resistor, a power supply, a power loop resistor and a shunt resistor. Through the present invention, the problem in the related art that the Cascode-type GaN device causes large oscillations at high switching frequencies, resulting in serious voltage overshoot, additional power loss, electromagnetic interference noise, and even device breakdown, reducing the reliability of the system, is solved, and the technical effects of quantitatively suppressing switching oscillations and matching the parameters for suppressing oscillations, ensuring the safe and reliable operation of the GaN device and fully exerting the high-frequency switching characteristics of the GaN power device are achieved.

The application discloses a preparation method of an electrode foil for a capacitor, and aims at solving the problem that a conductive polymer cannot be filled densely in a micro-hole of an aluminum foil. The method comprises the following steps: coating an insulating shielding glue on a non-effective reaction area of the aluminum foil; generating a conductive polymer network in micro-holes of an effective reaction area by alternately immersing a monomer solution and an oxidant solution for multiple times; infiltrating a solidifiable gel electrolyte precursor into the network and solidifying in situ to form a solid gel electrolyte filled in the network; and finally forming a composite conductive layer on the effective reaction area. By constructing a double transmission channel with electronic and ionic conduction functions and optimizing a charge extraction interface, the application significantly improves the capacity extraction rate, high-temperature stability and reliability of the capacitor, and reduces an equivalent series resistance.

The application provides a capacitor fault identification method based on parameter fusion. By collecting multi-dimensional characteristic quantity data such as capacitance value, equivalent series resistance value and dielectric loss tangent value, and inputting the characteristic fusion into a target network model, the accurate classification of the capacitor fault type is realized. Through the complementarity of multi-dimensional characteristic quantity and the extraction of time domain statistical characteristics combined with the feature fusion technology, the correlation between the characteristics is fully mined, and the representation ability of the model to the fault mode is enhanced. The target network model can specifically fuse a deep feedforward neural network, a convolutional neural network and a long short-term memory network to extract static characteristics, dynamic characteristics and time sequence dependency, respectively, and form a spatio-temporal joint feature expression. Therefore, the effectiveness, reliability and practicability of the capacitor fault diagnosis in engineering application are improved.

The application provides a super capacitor communication base station power management method and system based on the Internet of Things, relates to the technical field of power management, and comprises the following steps: collecting a voltage vector and an equivalent series resistance characteristic to construct a dynamic coupling matrix; collecting a temperature field distribution characteristic, estimating a capacity attenuation trajectory, and calculating residual energy; acquiring load data to generate group-level energy distribution instructions; identifying high-risk monomers to optimize a charge transfer path, combining a temperature abnormal area to generate a current limiting coefficient, determining a balancing control instruction, and realizing hierarchical charging and discharging control. The application improves the real-time performance, accuracy and safety of super capacitor group management.

The present invention provides a method for manufacturing electrodes for energy storage devices and a composition that facilitates the formation of thinner electrode films by reducing the binder material content while maintaining desirable mechanical and / or electrical performance. [Solution] The energy storage device 100 comprises a cathode 102 (104), an anode 104 (102), and a separator 106 between the cathode and the anode, wherein the anode and / or cathode comprises electrode films 112, 114, 116, 118 containing a superfibrillated binder material and carbon. The method for manufacturing the electrode films includes a fibrillation process using a slow rate and / or high processing pressure so that the fibrillation of the binder material can be enhanced. The electrode films contain conductivity-enhancing additives to promote a reduction in equivalent series resistance.

The objective is to provide a tuning fork-type oscillator that can reduce the equivalent series resistance. [Solution] The tuning fork vibrator 10 has a base 1 and two tuning fork arms 2 and 3 extending from the base 1, with grooves 21, 22, 31, and 32 formed on the first surface and the second surface opposite the first surface of the tuning fork arms 2 and 3, respectively. The widthwise centers of the grooves 21 and 31 formed on the first surface of the tuning fork arms 2 and 3 are offset in a first direction toward the space between the two tuning fork arms 2 and 3 from the widthwise center of the tuning fork arms 2 and 3, and the widthwise centers of the grooves 22 and 32 formed on the second surface of the tuning fork arms 2 and 3 are offset in a second direction opposite to the first direction from the widthwise center of the tuning fork arms 2 and 3.

Technologies for providing temperature compensation in an analog receiver front end (RX AFE) are described. A receiving device includes an RX AFE circuit with at least one load component and at least one load inductor structure with a closed ring. The RX AFE circuit is subject to fluctuations in circuit parameters over a temperature range, causing temperature drift in the receiving device. The closed ring reduces the temperature drift by generating an eddy current to reduce the effective inductance of the at least one load inductor structure. The eddy current depends on the equivalent series resistance (ESR) of the closed ring.

An energy storage device can include a cathode, an anode, and a separator between the cathode and the anode, where the anode and / or electrode includes an electrode film having a super-fibrillized binder material and carbon. The electrode film can have a reduced quantity of the binder material while maintaining desired mechanical and / or electrical properties. A process for fabricating the electrode film may include a fibrillization process using reduced speed and / or increased process pressure such that fibrillization of the binder material can be increased. The electrode film may include an electrical conductivity promoting additive to facilitate decreased equivalent series resistance performance. Increasing fibrillization of the binder material may facilitate formation of thinner electrode films, such as dry electrode films.

This invention provides a multilayer electronic component that can suppress heat generation in high-voltage environments, has low equivalent series resistance (ESR), improved capacitance characteristics, a high Q value, and satisfies COG characteristics. [Solution] A stacked electronic component according to one embodiment of the present invention includes a body containing a dielectric layer mainly composed of (Ca, Sr)(Zr, Ti)O3 and internal electrodes arranged alternately with the dielectric layer, and an external electrode arranged on the body, wherein the dielectric layer contains a first secondary phase containing rare earth elements (RE), zirconium (Zr), and oxygen (O) at an area percentage of 0.1% to 10% of the cross-sectional area of ​​the dielectric layer, and the internal electrodes may contain a second secondary phase containing nickel (Ni) and oxygen (O) at an area percentage of 0.5% to 10% of the cross-sectional area of ​​the internal electrodes.

To provide a multilayer electronic component having excellent reliability, excellent moisture resistance reliability, low equivalent series resistance (ESR), and excellent bending strength.SOLUTION: A multilayer electronic component according to an exemplary embodiment in the present disclosure may include a dielectric layer and internal electrodes alternately disposed with the dielectric layer, and may include a body and external electrodes. Third and fourth surfaces of the body may include: an exposed portion in which the dielectric layer and the internal electrodes are alternately exposed; and a non-exposed portion other than the exposed portions. The external electrodes may include: a base electrode layer; an intermediate electrode layer disposed on the base electrode layer; and an upper electrode layer disposed on the intermediate electrode layer. The base electrode layer is disposed on the exposed portion and the non-exposed portion, the intermediate electrode layer is disposed on the non-exposed portion, the base electrode layer is disposed on the non-exposed portion, the base electrode layer may include a metal, the intermediate electrode layer may include a metal and a resin, and the upper electrode layer may include Sn and a resin.SELECTED DRAWING: Figure 2

The present application relates to air conditioner detection technical field, propose a kind of air conditioner electrolytic capacitor health on-line detection method and system, the air conditioner electrolytic capacitor health on-line detection method includes collecting the voltage ripple signal of DC-DC step-down converter output in air conditioner, and detects the zero-crossing time of first time through direct current average voltage in a switching cycle, obtains first zero-crossing time;At the switching on starting moment or switching off moment of switching cycle, single sampling is carried out to output voltage ripple signal, and sampling voltage value is obtained;According to the running state of DC-DC step-down converter, it is judged that DC-DC step-down converter is currently in continuous conduction mode or discontinuous conduction mode;Based on the judgment result, corresponding capacitor parameter calculation model is selected, and the capacitance value and equivalent series resistance of output capacitor are calculated;The capacitance value and equivalent series resistance calculated are compared with preset threshold value, and if exceed threshold value, then trigger capacitor health state early warning.

Disclosed is an electrolytic capacitor including: an electrode foil; and a lead member that is connected to the electrode foil. The lead member includes a lead wire and a plate-shaped tab portion that is provided at one end portion of the lead wire. The tab portion has a surface with an arithmetic average roughness Ra of 4 μm or more. The electrode foil and the lead member are connected by a crimping portion in an overlapping portion in which the tab portion and the electrode foil overlap each other when the electrode foil is placed on the surface of the tab portion.

A hydrogen generation system comprising a hydrogen electrolyser, a power converter connected to the electrolyser, and a control system configured to control the power converter to supply power to the electrolyser The system further includes a monitoring system configured to monitor the operation of the generation system, wherein the monitoring system is configured to: determine a plurality of operational parameters of the electrolyser, and, generate one or more performance metrics based on the determined operational parameters, the one or more performance parameters including: the electrical capacitance of the electrolyser, and / or the equivalent series resistance of the electrolyser. Also disclosed is a method for determining operational performance of a hydrogen generation system including an electrolyser.

The invention discloses a power supply circuit fault diagnosis and analysis system based on frequency domain feature extraction, and relates to the field of power supply circuit fault diagnosis. The method comprises the following steps: acquiring output voltage and output current time domain signals in a power supply circuit operation state, and obtaining a switching frequency; short-time test disturbance is injected by superposing a test modulation signal in a switch driving signal, and a power supply circuit generates corresponding frequency domain response under the condition that steady-state power supply of a power supply is not changed; performing frequency domain transformation on the acquired signal, extracting a voltage amplitude, a current amplitude and a phase difference at a test disturbance frequency, and calculating an equivalent series resistance and an equivalent capacitance based on a preset capacitor series impedance model; and determining the capacitance degradation degree according to the variable quantity of the parameter relative to the reference parameter, and outputting a fault diagnosis result. According to the invention, online measurement of capacitance parameters can be realized in the normal operation process of the power supply, the reliability of parameter identification is improved, and support is provided for maintenance of a power supply system.

The application belongs to the field of aluminum electrolytic capacitor paper, and particularly relates to a high-voltage-resistant and high-liquid-absorbing composite electrolytic capacitor diaphragm and a preparation method thereof. The diaphragm is composed of at least two layers of high-density base paper, and the base papers are intermittently and punctiformly bonded by a hydrophilic polymer with a surface coating area of 10% to 40% and a gumming amount of 0.1 to 10 g / m2, so as to ensure the improvement of the breakdown voltage and the reservation of the pore structure between the papers, significantly improve the liquid absorption capacity and reduce the equivalent series resistance (ESR). The application solves the problem that the existing high-voltage diaphragm is difficult to have both pressure resistance and liquid absorption, and has the advantages of simple structure, excellent electrical performance, and suitability for large-scale production.

An ultra-capacitor module utilizing a series connected DC-to-DC converter provides autonomous monitoring of parameters associated with an ultra-capacitor cell stack comprising a plurality of ultra-capacitor cells. Parameters may include equivalent series resistance (ESR) and capacitance.