6375 results about "Dc source" patented technology

Systems, methods, and articles for a portable power case are disclosed. The portable power case is comprised of at least one battery and at least one PCB. The portable power case is operable to supply power to a transceiver. The portable power case is operable to be charged using a DC power source (e.g., solar panel, wind turbine, water turbine). A plurality of portable power cases, DC power sources, and transceivers are operable to form a mesh network.

The invention discloses a storage battery capacity checking method for a parallel intelligent direct-current power supply system, and relates to the technical field of storage battery capacity checking, which comprises the following steps of: respectively deploying electromagnetic sensing modules with nanosecond-level response capability at a master control end and a slave node end of a communication bus, acquiring voltage disturbance waveform signals of the communication bus in an operation process, and performing feature extraction operation on the transient high-frequency interference pulse detected each time, and constructing a multi-dimensional feature sequence of the high-energy transient electromagnetic interference. By deploying the high-response electromagnetic sensing module and combining an active suppression mechanism of interference feature extraction and risk index driving, time alignment modeling and self-adaptive regulation and control of electromagnetic interference and communication performance are realized, the communication stability, the battery state recognition accuracy and the capacity accounting continuity of the system in a strong interference environment are effectively improved, and the system reliability is improved. And the anti-interference capability and the operation safety of the parallel direct-current power supply system are obviously enhanced.

An in-vehicle charging device that includes a first circuit configured to include the excitation circuit and convert power between AC power on an external AC power supply side and first DC power; and a second circuit configured to include the inverter, the multi-phase stator coils, and an output capacitor, and generate second DC power for charging the DC power supply from the first DC power, wherein the output capacitor is connected between the neutral point of the multi-phase stator coils and a DC negative electrode.

The invention discloses an intelligent monitoring method for a parallel DC power supply system based on an edge gateway, and the method comprises the following steps: S1, collecting and processing real-time data, and generating a health baseline; s2, comparing the real-time data with the health baseline, and automatically identifying an abnormal state; s3, generating a fault fingerprint based on a fault fingerprint generation algorithm, and storing the fault fingerprint in a fingerprint database to form a fault file; s4, generating an intention map by using a situation modeling algorithm, dynamically predicting a load demand based on an intention prediction algorithm, and performing adjustment according to a load priority; s5, generating a dynamic power supply parameter adjustment scheme through an evolution rule engine, and performing real-time optimization by adopting a self-evolution algorithm; s6, a multi-time window adaptive memory management module based on an edge gateway performs hierarchical storage and management on real-time data according to time windows; and S7, analyzing the real-time monitoring data based on a closed-loop feedback control system. According to the invention, the edge gateway and the adaptive algorithm are utilized to realize real-time monitoring and optimization of the parallel DC power supply system.

The invention discloses a preparation method of a low-internal-resistance copper foil for a lithium ion battery, which comprises the following specific steps of: 1, grinding a titanium cathode roller by using a grinding wheel of 50-600 meshes, removing an oxide layer, foreign matter points and the like on the surface of the cathode roller, and grinding by using a grinding wheel of 1000-1500 meshes; 2, the cathode roller falls into an electrolytic bath provided with an anode plate, and copper sulfate electrolyte is introduced into the electrolytic bath; and 4, a direct-current power supply is switched on, the current density of the power supply is 60-70 A / dm < 2 >, copper foil is subjected to electrolytic deposition on the arc-shaped cathode roller surface according to the Faraday principle, then the copper foil is subjected to acid pickling, water washing and passivation, and the lithium battery copper foil with the low internal resistance is obtained. On one hand, the problems of coating wrinkling and tab collapse in the battery preparation process are solved, on the other hand, the safety problem caused by excessive internal resistance and heating in the battery using process of an existing copper foil serving as a current collector is solved, and the performance such as the energy density and the rate characteristic of the battery is improved.

The invention relates to a PFC-PWM (Pulse Width Modulation) dual-mode control method for a high-voltage direct-current power supply with a wide output voltage range. The output current of the high-voltage direct-current power supply is detected in real time, the critical threshold value of the load impedance is mapped into the hysteresis interval of the output current, the theoretical boundary of mode switching is obtained, and the control mode is dynamically adjusted. In order to further guarantee smooth switching of the two control modes, hysteresis control logic is designed, and undisturbed smooth switching of the PFM mode and the PWM mode is achieved. Based on an energy equivalence principle and a frequency consistency constraint of a critical load SWL working point, a current threshold criterion and a parameter pre-synchronization strategy are constructed, seamless connection of a mode switching process in a frequency domain and an energy domain is ensured, a transient oscillation risk is remarkably reduced, and a guarantee is provided for continuous and stable output of a full-range load working condition.

The invention discloses a DC power supply health state prediction model optimization method based on an extreme learning machine, and relates to the technical field of power supply intelligent management. According to the method, an extreme learning machine basic model is improved, multi-layer ELM-AE is adopted to carry out greedy unsupervised learning on input data layer by layer, advanced features of an original data set are extracted, a mixed kernel function is adopted as a regression layer of a supervised learning stage, the complex nonlinear problem is solved, and the method has the advantages of being high in robustness and high in robustness. The adaptability of the prediction model to diversified characteristics under different battery working conditions is improved, the generalization ability and prediction precision of the model are improved, and the convergence speed and prediction precision of the model are remarkably improved by optimizing the model parameters through the improved black-wing calculation algorithm.

The invention provides an elevator energy-saving device which is connected to an elevator frequency converter bus in parallel and comprises a battery pack, a BMS battery management system, a power control system, a DC-DC direct-current power source and a PLC, the DC-DC direct-current power source is connected with the BMS battery management system and connected to the elevator frequency converter bus in parallel, and the power control system is connected with the PLC. The PLC is connected with the DC-DC direct-current power supply, and the DC-DC direct-current power supply transforms the voltage accessed from the battery pack to the second preset voltage under the action of the PLC, so that the voltage of the high-voltage end is controlled to be the second preset voltage; under the action of the high-low voltage difference, when the elevator generates power, the voltage on the elevator frequency converter bus does not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device. The invention has the characteristics of energy conservation, high efficiency, reduced operation cost, stable operation, reduced power grid pressure and prolonged service life of equipment.

An in-vehicle charging device charges a vehicle driving device DC power supply including: a rotating electrical machine including coils of multiple phases connected at a neutral point, and serving as a driving power source of a wheel; an inverter converting power between direct and alternating currents of multiple phases; and the DC power supply connected to the inverter, the in-vehicle charging device including: an AC-DC converter converts power between AC power and first DC power; an active decoupling circuit that includes the inverter, the coils of multiple phases, and an output capacitor, and generates second DC power for charging the DC power supply from the first DC power, in which a DC side terminal of the AC-DC converter and a DC side terminal of the inverter are connected without another passive component, and the output capacitor is connected between the neutral point of the coils and a DC negative electrode.

The invention relates to the technical field of power electronics and energy management. The invention provides an AC / DC power supply system monitoring device and method. The method comprises the following steps: constructing a historical data set; preprocessing the historical data set to obtain a preprocessed data set; based on the preprocessed data set and a machine learning algorithm, constructing a system monitoring model, and presetting a voltage anomaly judgment threshold value of the system monitoring model; acquiring real-time power data of the AC / DC power supply system and real-time operation state and load change data of the power grid, inputting the data into the system monitoring model, and identifying the mode, trend and potential abnormity of voltage fluctuation of the AC / DC power supply system; and dynamically adjusting a preset voltage abnormity judgment threshold value, and giving a corresponding AC / DC power supply system adjustment strategy and early warning information. The problems that in the prior art, an alternating-current and direct-current power supply system monitoring method is low in efficiency, frequent in false alarm and missing alarm conditions, difficult to adapt to a complex and changeable power grid environment and lack of intelligent analysis and early warning functions are solved.

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

The invention provides a thermal behavior experiment system and method under a narrow rectangular channel reflooding cooling condition. The system comprises a heating water storage tank, a nitrogen tank, a steam tank, a shield pump, a preheating section, a first direct-current power supply, a second direct-current power supply, a narrow rectangular channel test section, a steam-water separator, a surge tank, a flow control valve, a silencer and an electromagnetic valve. The experimental working medium is deionized water, and re-submerging cooling experiments under different system pressures, working medium supercooling degrees, heating wall surface heat flux densities, working medium submerging speeds, heating wall surface initial temperatures and channel interior initial liquid levels can be carried out on an experimental section of a narrow rectangular channel structure. The device is suitable for narrow rectangular channel structures with different sizes, and can be used for carrying out re-submerging experiments on experiment sections with single-plate double-channel, double-plate three-channel and more channels. The system pressure and the inlet flow in the submerging process can be kept stable, and it can be ensured that the supercooling degree of a working medium, the heating wall surface temperature and the initial liquid level are controllable.

The invention relates to the technical field of radio frequency modules, and discloses a radio frequency module power amplifier efficiency test method and system, and the method comprises the steps: connecting a signal generator, a power meter, a spectrum analyzer and a DC power supply with a to-be-tested power amplifier, and obtaining a layered power amplifier efficiency test system; establishing a continuous wave test model and a modulation signal test model to obtain compensation parameter data; inputting a first test signal to the to-be-tested power amplifier to obtain power gain data and standardized efficiency data; inputting a second test signal to the to-be-tested power amplifier to obtain adjacent channel leakage power ratio data; performing total efficiency analysis and isolation efficiency analysis on different working states to obtain a layering efficiency analysis result; and carrying out standardization processing on a hierarchical efficiency analysis result, establishing power measurement error evaluation and efficiency calculation error evaluation, and obtaining a power amplifier efficiency test report, thereby realizing comprehensive evaluation on the efficiency characteristics of the power amplifier in different working states.

The invention discloses an enterprise electricity consumption analysis and prediction method based on data mining, and relates to the technical field of DC power supply monitoring, historical electricity consumption data is acquired, and electricity consumption characteristic analysis and mining are performed from multiple directions according to the historical electricity consumption data to obtain electricity consumption rule information and seasonal change characteristics; analyzing the scale and speed increase of the agent electricity purchasing users and the annual change trend of the agent electricity purchasing quantity to obtain development and operation information of agent electricity purchasing; based on historical electric quantity data, constructing exponential smoothing, ARIMA, SARIMA and LSTM neural network multiple time sequence prediction models, and performing comparison to select an optimal model; through accurate power consumption prediction, the enterprise is helped to optimize power resource configuration, plan power purchase work in advance and reduce the power cost of the enterprise, and especially under the condition that the power market fluctuates greatly, the enterprise can better understand the market dynamic condition and formulate a corresponding power purchase strategy by predicting the scale and speed increase of the proxy power purchase user.

Provided is a downhole device, a well system, and a method. The downhole device, in one aspect, includes an electromagnetic assembly, as well as a magnetic target positioned proximate the electromagnetic assembly, wherein one of the magnetic target or the electromagnetic assembly is coupled with a movable feature of the downhole device, the movable feature configured to move to physically couple or physically decouple the electromagnetic assembly and the magnetic target. The downhole device, according to this aspect, further includes a sensor electrically coupled to the electromagnetic assembly, the sensor configured to sense for a change in a DC power parameter powering the electromagnetic assembly as the electromagnetic assembly and magnetic target physically couple to or physically decouple from one another, the sensed change representative of a change of impedance within a coil of the electromagnetic assembly and employable to estimate the status or health of the downhole device.

The invention relates to the technical field of direct-current power supply fault diagnosis, in particular to a fault self-diagnosis modular direct-current power supply system, which is characterized in that a failure mechanism dynamic modeling unit constructs a multi-stress coupling degradation mapping library, adopts a degradation mechanism decoupling algorithm to separate and superpose failure effects and generates a dynamic degradation model; the early degradation capture unit deploys a high-frequency wide-domain sampling circuit and a noise suppression signal chain, combines time-frequency domain joint feature extraction and separates degradation feature signals from background noise, and the self-adaptive life prediction unit adopts a long short-term memory network and random forest fusion algorithm to dynamically correct parameters and output residual life probability distribution. The intelligent fault judgment unit realizes progressive diagnosis through a hierarchical threshold decision mechanism, and the health management cooperative execution unit triggers a pre-maintenance strategy, executes power flexible derating, redundancy switching or directional fusing isolation, and improves the reliability of the system.

The invention discloses an output voltage detection method and system based on an aviation power supply, and relates to the technical field of aviation power supply voltage detection. A differential voltage sensor is connected to the output end of an aviation power supply, a high-frequency suppression capacitor is connected in parallel, the sampling rate of 20-50 times of the working frequency is set according to the type of the power supply, and the signals are collected and converted into analog voltage signals; the analog signal is subjected to two-stage filtering, is amplified to 0-5V through an instrument amplifier, and is converted into a digital voltage sequence through a 16-bit ADC (Analog to Digital Converter); calculating AC power supply effective value, peak value and other parameters, DC power supply average value, ripple coefficient and other parameters; comparing the characteristic parameters with a preset threshold value, determining that the characteristic parameters exceed the threshold value and recording related information; and a detection result is transmitted to a monitoring terminal through an RS485, data is locally stored, and a switching value is output to an alarm device when the data is abnormal. The method adapts to aviation power supply load fluctuation and environment temperature change, detection precision is high, data transmission and storage are safe, abnormity is accurately identified and early warning is carried out in advance, and aviation power supply operation and maintenance reliability and efficiency are improved.

The invention discloses a single-load wireless power transmission system with single transmitting and double receiving coils and a method thereof. The system comprises a direct-current power supply, a high-frequency inverter, a transmitting end compensation topology module, a transmitting coil module, two receiving coil modules, two receiving end compensation topology modules, a rectifier module, a filter capacitor and a system load module. The topological structure adopts S-LC and S-LCC compensation topology, and a topological structure parameter optimization method is provided, so that the anti-offset characteristic of the system is effectively improved. The optimized system can realize the stability of the output power of the system under the working conditions of offset and load change within a certain range. According to the system, the cost of the system is reduced, the high anti-offset capability can be achieved, the output power is stable, and the overall efficiency of the system is improved.

The embodiment of the invention provides a battery charging and discharging device and a new energy automobile. The battery charging and discharging device comprises a charging interface, an electric drive assembly and a battery pack interface, the charging interface is used for accessing an external direct-current power supply and comprises a positive electrode access end and a negative electrode access end; the electric drive assembly comprises a motor, a first bridge arm and a second bridge arm; each phase line of the motor is respectively connected with the first end of the first bridge arm and the first end of the second bridge arm; the second end of the first bridge arm is connected with the anode access end; the second end of the second bridge arm is connected with the negative electrode access end; in the battery pack interface, a first access end used for accessing a positive electrode of a power battery pack is connected with a second end of the first bridge arm, a second access end used for accessing a negative electrode of the power battery pack is connected with a second end of the second bridge arm, and one of the first access end and the second access end is connected with the motor. The purpose of increasing the charging speed at least can be achieved.

The invention discloses a VSG-VDG-based autonomous control method and device for an AC-DC hybrid micro-grid interconnection converter. The equipment comprises a direct-current micro-grid, an alternating-current micro-grid and an interconnection converter connected with the direct-current micro-grid and the alternating-current micro-grid. The direct current microgrid is provided with a direct current side VDG control module which is used for controlling a direct current converter to adjust direct current power supply output by collecting internal voltage and current signals; the AC micro-grid is provided with an AC side VSG control module which is used for controlling on-off of a switching tube of a three-phase full-bridge inverter by collecting internal voltage and current signals so as to adjust AC three-phase voltage output. The interconnection converter is provided with an interconnection converter control module which is used for connecting the direct-current bus and the alternating-current bus through the bidirectional interface converter and adjusting energy balance in the subnet through bidirectional energy flow. According to the method, the robustness of the AC / DC micro-grid system is enhanced, and the fault self-healing capability of the system under extreme conditions and the transient and steady-state stability of a controlled system are improved.

The present invention provides a battery energy storage parallel equalization converter topology and a control method therefor. The battery energy storage parallel equalization converter topology comprises a series-connected battery energy storage parallel equalization converter, a main converter, and a plurality of groups of filter inductors; in the main converter, the input side of a DC / DC or DC / AC converter is connected in parallel to a parallel voltage-stabilizing capacitor, and the output side of the DC / AC or DC / AC converter is correspondingly connected to an AC or DC source load; the series-connected battery energy storage parallel equalization converter comprises a plurality of groups of small-capacity DC / DC converters and a common DC bus capacitor; the output sides of all the small-capacity DC / DC converters are connected in parallel by means of the common DC bus capacitor to form a common DC bus; the input side of one group of small-capacity DC / DC converters is connected in series to the input side of the main converter, and the input sides of other groups of small-capacity DC / DC converters are connected in series to a battery pack by means of the filter inductors, respectively. According to the present invention, in a battery charging and discharging process, only a small amount of power flows through the converter, reducing the capacity requirements of the converter, and reducing the transmission efficiency.

The invention provides an electrolytic bath impedance measurement method and system considering dynamic disturbance, and relates to the field of electrochemical equipment, and the system comprises a direct current power supply module which is used for providing a direct current power supply for an electrolytic bath; the parameter optimization module is used for determining an optimal disturbance frequency band and an optimal disturbance parameter according to the working condition of the electrolytic cell and the equivalent circuit model of the electrolytic cell; the alternating current disturbance module is used for injecting a dynamic disturbance signal to the electrolytic cell according to the optimal disturbance frequency band and the optimal disturbance parameter; the feedback acquisition module is used for acquiring feedback data of the electrolytic bath on the dynamic disturbance signal; and the impedance analysis module is used for calculating the impedance of the electrolytic cell based on the feedback data, and has the advantage of realizing accurate measurement of the impedance of the electrolytic cell under the dynamic working condition.

The invention discloses a slurry detection device and method and a slurry coating system, and relates to the technical field of batteries. The conductive liquid and the target particulate matter filtered from the battery slurry sample are accommodated in the insulating groove, and the liquid and the target particulate matter in the insulating groove can flow into the hole pipe through the hole under the condition that the internal pressure of the hole pipe is greater than the external pressure. When target particles enter the hole pipe through the hole, a voltage pulse signal is generated. At the moment, the voltage sampling circuit connected in parallel with the direct-current power supply can detect the voltage pulse signal, and then the particle condition in the battery slurry can be determined according to the voltage pulse signal. Therefore, according to the slurry detection device provided by the embodiment of the invention, the particle condition of the battery slurry can be directly determined through the collected voltage pulse signal, manual observation and analysis through a microscope are not needed, the production efficiency is improved, and the potential safety hazard is reduced.

The invention discloses a pulse type electromagnetic thruster performance detection system and an analysis method. A direct-current power supply, an ignition trigger controller, a pulse current detector, a pulse high-voltage detector, a discharge waveform collector, a pulse type electromagnetic thruster, a polar plate inductance intensity measuring device, a thruster impulse measuring device and a plasma movement speed measuring device are adopted. The polar plate inductance intensity measuring device is used for measuring the inductance gradient of a polar plate discharge channel of the pulse type electromagnetic thruster under different polar plate configurations; the thruster impulse measuring device is positioned below the pulse type electromagnetic thruster and is used for acquiring an output impulse value of the thruster when the pulse type electromagnetic thruster discharges and works; the plasma motion speed measuring device is arranged at the front end of a nozzle of the pulse type electromagnetic thruster and used for measuring the motion speed of plasma plume jetted by the pulse type electromagnetic thruster. According to the invention, measurement of macroscopic performance parameters of the pulse type electromagnetic thruster is realized, and quantitative characterization of microscopic characteristics of the thruster can be realized at the same time.

The invention relates to the technical field of direct-current power supply systems, in particular to a guard power supply module control method based on a dual-active bridge converter. The method comprises the following steps: taking a discharge mode as an initial mode, monitoring direct current bus side voltage feedback V1, and calculating a phase shift angle phi; judging whether an instruction for starting a charging path is received or not; if an instruction of starting a charging path is received, converting into a charging mode, monitoring voltage feedback V2 at the side of the storage battery pack, and realizing switching between the two working modes by controlling a phase shift angle phi; judging whether the voltage of the direct current bus side is higher than the voltage feedback V1 of the direct current bus side in the discharging mode or not during the starting period of the charging path; if the voltage is higher than V1, the charging path is kept in an open state; and if the voltage is lower than V1, closing the charging path and converting into a discharging mode. The problems that in the prior art, the working mode switching is slow, especially when the power grid voltage suddenly drops or rises, the system response is not timely, and the efficiency is low under the light load or heavy load condition are solved.

The invention relates to the technical field of direct-current power supplies, in particular to a silicon carbide material-based high-power synchronous rectification direct-current power supply and a control method thereof, and the silicon carbide material-based high-power synchronous rectification direct-current power supply comprises an input filtering module, a high-frequency inversion module, a synchronous rectification module, an output filtering module and a control module; the output end of the high-frequency inversion module is connected with the input end of the synchronous rectification module, and the high-frequency inversion module is composed of a full-bridge inversion circuit composed of SiC MOSFETs. The output end of the synchronous rectification module is connected with the input end of the output filtering module, and the synchronous rectification module comprises a topological structure in which a SiC Schottky diode and a SiC MOSFET are connected in parallel; and the control module is in signal connection with the high-frequency inversion module and the synchronous rectification module, acquires input voltage, output voltage, current and temperature parameters in real time, and controls the on-off state of each module through a driving signal. The invention has the effects of effectively reducing the power supply energy loss and improving the power supply efficiency.

The invention relates to the technical field of electrical variable measurement, in particular to a 5G technology-based DC power supply system insulation detection method, which comprises the following steps of: obtaining a leakage current signal data sequence, a leakage voltage signal data sequence, a current data sequence and a voltage data sequence; the difference between current data at corresponding moments in the leakage current signal data sequences of the target time period and each reference time period, the difference between data in the current data sequences and the difference between data at the same position in the current data sequence and the voltage data sequence of the target time period are changed; obtaining an initial abnormal factor of the target time period; obtaining an insulation evaluation factor of a target time period through the trend change between the initial abnormal factor and all adjacent abnormal sequences; and direct-current power supply system insulation detection based on the 5G technology is carried out. According to the invention, the influence of electromagnetism on leakage current data is reduced, and the accuracy of insulation detection of a direct-current power supply system of the 5G technology is improved.

Devices and methods for measuring capacitance of a load. A device may include a ground connector configured to couple to ground and an output connector configured to couple to the load. The device may include a direct current (DC) supply arranged in a conduction path between the ground connector and the output connector wherein the DC supply is configured to apply a DC voltage and noise voltage onto the conduction path. The device may include a voltage monitor configured to monitor the noise voltage applied by the DC supply and the device may include a current monitor configured to measure current in the conduction path that results from the noise voltage. The device may include a capacitance module coupled to the current monitor and voltage monitor, the capacitance module configured to determine the capacitance based upon the monitored current and noise voltage.

The invention discloses a distribution network low-voltage extension type direct-current ice melting method and an ice melting management system, and relates to the field of disaster prevention and reduction of an electric power system, and the method comprises the steps: obtaining an electrical characteristic signal, an icing thickness value and weather forecast data of each target line; calculating power loss distribution of each target line, and dividing the target line into a plurality of electron supply zones; inputting the icing thickness value and the weather forecast data into an icing prediction model to obtain an icing development trend; carrying out correlation operation on the icing development trend and the corresponding power loss distribution to obtain an ice melting priority and an ice melting current value; generating a power supply execution sequence and a direct-current power supply output parameter; and generating an ice melting execution scheme based on the power supply execution sequence and the DC power supply output parameters, and implementing ice melting power supply according to the ice melting execution scheme and the power supply execution sequence. According to the invention, ice melting planning can be carried out, and electric energy waste is avoided.