195 results about "Current range" patented technology

A control method for suppressing an overvoltage of the receiving end hybrid modular multilevel converter with full-bridge submodules and half-bridge submodules (F / HMMC) under the fault at the receiving-end alternating-current (AC) system of the hybrid high-voltage direct-current (HVDC) transmission system. After a short-circuit fault occurs in a receiving-end AC) system of the hybrid HVDC transmission system, an AC voltage drop is generated, and the effective voltage of the receiving-end AC bus at the current time is measured. Because the hybrid modular multilevel converter (MMC) is capable of actively decreasing the DC voltage for operation, on a premise of ensuring that its output current is always within a rated current range, a control manner of setting the reference DC voltage and making the reference DC voltage not greater than the effective voltage of the AC bus enables receiving end power to be sent out, thereby suppressing an overvoltage of the receiving-end F / HMMC.

A communication method includes: sending a first poll frame, where the first poll frame is for triggering ranging measurement in a first range-measurement cycle, the first poll frame further indicates a first parameter set that takes effect in the first range-measurement cycle, and the first parameter set includes one or more of the following parameters: a first narrowband physical layer (PHY) parameter, a first narrowband channel allow list, a first ranging block structure parameter, or a first ultra-wideband (UWB) multi-millisecond (MMS) ranging configuration parameter; and receiving a response frame of the first poll frame. According to the present disclosure, an initiator uses a poll frame to indicate a parameter set that takes effect in a current range-measurement cycle.

A method of programming non-volatile memory cells comprising determining a target read current for respective ones of the memory cells based upon incoming data, associating respective ones of the memory cells with a respective one of a plurality of cell groups based upon the determined target read current for the respective memory cell being within a target read current range associated with the respective cell group, fast programming respective ones of the memory cells to a coarse target read current associated with the cell group to which the respective memory cell is associated, wherein the coarse target read current for respective ones of the cell groups is greater than the target read current range for the respective cell group, and then slow programming respective ones of the memory cells until the target read current determined for the respective memory cell is achieved.

The invention provides a single-mode semiconductor laser failure assessment method and device and electronic equipment, and relates to the technical field of semiconductor lasers. The method comprises the following steps: acquiring an optical power current characteristic test curve of the failed single-mode semiconductor laser; determining an optical power parameter change trend of the failed single-mode semiconductor laser according to a preset optical power current characteristic standard curve and the optical power current characteristic test curve of the failed single-mode semiconductor laser; if the optical power parameter variation trend indicates that the optical power parameter in the working current range is zero, determining that the failure type is optical cavity surface catastrophe damage; and if the optical power parameter variation trend indicates that the optical power parameter in the working current range is non-linearly decreased, determining that the failure type is optical body material catastrophe damage, so that the failure type of the single-mode semiconductor laser can be judged through the optical power current characteristic test curve. The evaluation cost can be reduced, the evaluation efficiency is improved, and the accuracy of evaluation results is ensured.

A current measurement system, comprising a plurality of parallel sensing circuits, each sensing circuit configured to measure a respective range of voltage corresponding to a current through a load, wherein each sensing circuit is triggered to initiate measurement of a voltage across the load in response to a buffer current through a common buffer reaching a respective threshold, a buffer circuit for inputting a virtual ground voltage or a virtual ground current to the load and to the plurality of parallel sensing circuits, the virtual ground voltage corresponding to the voltage across the load or the current through the load, and a processor coupled to the plurality of parallel sensing circuits, wherein the processor is configured to combine data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the load.

The invention relates to the technical field of smart home, and discloses a range hood parameter synchronization control method and device applied to multiple associated scenarios, and the method comprises the steps: judging whether there is an associated family scene in a scene when a user uses a range hood in a new family scene; if yes, the scene difference degree of the family scene and the associated family scene is compared to obtain scene difference degree information; according to the scene difference degree information, adjusting a range hood parameter control model corresponding to the associated family scene to obtain a range hood parameter control model corresponding to the family scene; and based on the range hood parameter control model, generating a current range hood control parameter corresponding to the range hood in the family scene. It can be seen that when the user uses the range hood in the new environment, the generation efficiency of the range hood parameter control model can be improved, the obtaining efficiency and timeliness of the range hood control parameters matched with the new environment can be improved based on the rapidly generated model, and therefore the range hood control efficiency and the range hood control reliability can be improved.

This utility model relates to the field of electrical energy detection technology, and proposes a high-current electrical energy detection device with closed-loop control function. The device includes: a programmable power source module, including an output drive unit for outputting current, voltage signals, and waveforms within a large current range; a standard measurement module connected to the output drive unit for detecting the current, voltage signals, and waveform parameters output by the output drive unit; a waveform sampling module connected to the output drive unit for sampling the waveform output by the output drive unit; a closed-loop control module bidirectionally connected to the programmable power source module and the waveform sampling module for adjusting the current, voltage signals, and waveforms; and an external device detection interface connected to the output terminal of the output drive unit for connecting different types of high-current metering devices. This utility model solves the problems of measurement error superposition, unstable output, and insufficient measurement range in traditional detection devices.

A power supply that extracts power from the electromagnetic field surrounding an electrical cable of an electrical grid over a wide current range through the electrical cable. The power supply includes multiple power supply modules connected in parallel across the same input ferromagnetic core and across the same output capacitor. The power supply modules have different numbers of windings across the ferromagnetic core, and when the output voltage exceeds an allowable value for a particular power supply module, a short circuit is applied across the winding of each power supply module.

The present application relates to a kind of load self-awareness wide range error calibration method and system for internet of things electric energy meter.The method obtains the cycle level voltage, current sampling data and current range state of electric energy meter, extracts current step slope, power factor mutation quantity and harmonic envelope attenuation characteristics, judges whether range boundary event occurs, and determines the range boundary residual window caused by sampling front end gain switching, holding capacitor release and digital filter history state residue.In the residual window, the update of current gain, active power gain, phase compensation and other calibration coefficients is frozen, while normal electric energy metering is maintained;After the end of the residual window, generate or call residual fading template based on stable samples before and after the boundary, and gradually release calibration update weight according to cycle.The present application can reduce the risk of wide range calibration parameter pollution by transition sample in load mutation scene, and improve the stability of internet of things electric energy meter online calibration.

The invention relates to the technical field of power system protection, in particular to a power distribution network multi-stage protection constant value self-adaptive cooperative calculation method and a power distribution network multi-stage protection constant value self-adaptive cooperative calculation system. Comprising the following steps: analyzing SVG and XML files to construct a network topological graph, and calculating short-circuit current of each switch node; clustering the switch nodes by adopting a K-means clustering algorithm, and adaptively determining a clustering number according to a short-circuit current range; extracting a representative path and carrying out duplicate removal processing; main switches are identified according to a clustering result, protection constant values are calculated, and constant values are distributed to non-main switches through linear interpolation; and outputting a complete protection setting value table. According to the method, full-process automation of protection setting value calculation is realized, the calculation efficiency and precision are remarkably improved, and the method has strong adaptive capacity and can quickly respond to power grid structure change and operation mode adjustment.

The invention relates to a switch protection circuit and an energy storage power supply. The switch protection circuit comprises a power supply circuit, a controller, a protection module and a driving module, the controller is used for outputting a disconnection control signal when the current of the power supply circuit exceeds a target current range; the protection module is used for outputting a disconnection protection signal when the current of the power supply circuit exceeds a preset current window and the duration of receiving the disconnection control signal exceeds a first duration; and the driving module is used for driving the power supply switch to be switched off when receiving the switching-off control signal and the switching-off protection signal. The switch protection circuit can prolong the service life of the power supply switch on the power supply circuit.

The utility model discloses a kind of driving circuit and display screen for display screen. Among them, the driving circuit includes: power module, first constant-current drive module and control module, wherein, the output end of power module is connected with the anode of red light-emitting diode, for providing voltage for red light-emitting diode;The power end of first constant-current drive module is connected with the output end of power module, the output end of first constant-current drive module is connected with the cathode of red light-emitting diode, for controlling the current that flows through red light-emitting diode maintains in first preset current range;The input end of control module is connected with the output end of power module, the first reference potential output end of control module is connected with the ground end of first constant-current drive module, for controlling the total power supply voltage of red light-emitting diode and first constant-current drive module maintains in first preset voltage threshold value.The utility model solves the technical problem that the difficulty of current LED drive circuit design is high, energy saving is poor.

The invention relates to the technical field of cranes, in particular to a resistance type crane counterweight detection system and method and a crane. According to the resistance type crane counterweight detection system disclosed by the invention, in-place detection of counterweight lifting is carried out through a current signal generated when the counterweight circuit on the counterweight block is communicated with the detection circuit on the rotary table to form a detection loop, so that misjudgment of counterweight lifting in-place caused by visual inspection or pressure switch detection can be effectively avoided; and the accuracy and the safety of the lifting performance are improved. The resistance value of the counterweight resistor in the detection loop is determined according to the current interval to which the current value of the detection loop belongs, and the actual weight of the hanging counterweight is further determined according to the resistance value. After the controller determines the actual weight of the balance weight, a weight signal of the actual weight of the balance weight is sent to the working condition matching module, so that correct matching of the working conditions of the crane is ensured, and correctness and safety of working condition selection are ensured.

To provide a lighting device or the like capable of suppressing a chromaticity difference during dimming.SOLUTION: A lighting device 40 includes a plurality of LED packages 42 which emit two or more kinds of light having different chromaticity values, and each first graph shape showing a relationship between a relative total luminous flux and a relative current of each of the plurality of LED packages 42 is equivalent in an actually supplied current range.SELECTED DRAWING: Figure 4

The application aims to provide an ultra-low voltage constant current source structure, and belongs to the technical field of analog circuits. The structure adopts a differential pair comparator and a depletion NMOS tube N1. The differential pair comparator outputs a control voltage to adjust an output current. PMOS tubes P4 and P5 are low-opening voltage PMOS tubes. The depletion NMOS tube N1 has an opening voltage of -0.3 V, and the lowest working voltage reaches 0.5 V, and the offset effect is small. The traditional operational amplifier constant current source circuit has limitations in a low-voltage environment. The design complexity is simplified, the chip area is reduced, the static power consumption is reduced, and the application is suitable for the power-sensitive field of Internet of Things sensors, medical implant devices and the like. In addition, the ultra-low voltage constant current source structure can realize wide current range output under ultra-low voltage, meet the demand of large current load scene, such as high-brightness LED driving, and expand the application scene.

The invention relates to the field of ship energy control, in particular to an electric ship energy control method based on working condition recognition. The method comprises the following steps: acquiring planned route information, and analyzing historical working conditions of route segments one by one to obtain historical working condition characteristics; real-time working condition parameters in the ship navigation process are collected; positioning and matching a plurality of sub-legs according to the real-time working condition parameters, and constructing a sub-leg working condition feature set; working condition deviation comparison is carried out on the historical working condition features according to the sub-leg working condition feature set, and a deviation state sequence is determined; performing propulsion power gap calculation based on the deviation state sequence to obtain a power gap compensation value; battery capacity information is identified, current endurance state evaluation is carried out, and an endurance evaluation value is obtained; and carrying out endurance constraint correction on the power gap compensation value according to the endurance evaluation value to obtain a power constraint adjustment value. According to the invention, through real-time working condition identification and analysis, energy efficiency optimization, endurance safety and operation reliability are considered under complex navigation working conditions.

This invention discloses a high-voltage circuit short-circuit protection method. The method includes: a battery management system (BMS) acquiring the high-voltage current of the high-voltage circuit corresponding to the battery energy distribution unit; the BMS determining the high-voltage circuit state based on the high-voltage current; and the BMS controlling the battery energy distribution unit to disconnect power based on the high-voltage circuit state and the high-voltage current. In this solution, the BMS can determine whether the high-voltage circuit is short-circuited by the high-voltage circuit state. When the short-circuit current cannot cause the integrated active-passive fuse to quickly thermally accumulate and disconnect the high-voltage circuit, the BMS controls the integrated active-passive fuse to actively disconnect the high-voltage circuit. When the short-circuit current can cause the integrated active-passive fuse to quickly thermally accumulate and disconnect the high-voltage circuit, the integrated active-passive fuse passively disconnects the high-voltage circuit through the thermal accumulation effect. Therefore, fast and effective short-circuit protection across the entire current range is achieved for the high-voltage circuit.

The embodiment of the invention provides semiconductor testing equipment and a current gear switching method and device thereof, and relates to the technical field of semiconductor testing. The current gear switching method is applied to semiconductor test equipment, and comprises the following steps: detecting whether a first switching instruction sent by an upper computer is received or not; if a first switching instruction is detected, a first smooth transition module is controlled to be connected to a circuit in the current gear switching process, and based on a plurality of resistance values output by the first smooth transition module under the current current gear, a current current gear module is firstly disconnected, and then a target current gear module is closed; or if the first switching instruction is detected, the target current gear module is firstly closed and then the current current gear module is disconnected based on the capacitance value which is output by the second smooth transition module and corresponds to the current current gear. According to the embodiment of the invention, the problem of test failure easily caused by transient voltage abrupt change when the current gear is switched in the prior art is solved.

The invention provides a circuit breaker contact system parameter adjusting method and device and electronic equipment, and relates to the technical field of circuit breakers, and the method comprises the steps: obtaining an arc contact opening range, a main contact opening range and a critical short-circuit current interval of a to-be-adjusted circuit breaker; calculating the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; the first proportion is adjusted in a first preset proportion interval, the to-be-adjusted circuit breaker performs a breaking test with the target short-circuit current as the short-circuit current according to the value of the first proportion, and the target proportion of the to-be-adjusted circuit breaker is determined according to the arcing time or breaking times obtained through the breaking test, the arc contact opening distance and the main contact opening distance of the to-be-adjusted circuit breaker are adjusted according to the target proportion; the first preset proportion interval is 1.2-1.4, and the target short-circuit current is any value in the critical short-circuit current interval. By adjusting the opening distance of the arc contact and the opening distance of the main contact, the breaking reliability of the circuit breaker in a rated short-circuit breaking current range is improved.

The present disclosure relates to a kind of control equipment, equipment control method and system, applied to automation field, the present disclosure includes: the running information of the walking axle of mechanical equipment is collected, according to the running information, set the preset current range, according to the preset current range, judge whether to trigger alarm information.In the above technical solution, the preset current range is set by the running information of the walking axle of mechanical equipment, when the current information of the walking axle of mechanical equipment meets the preset current range, alarm information will not be triggered, when the current information of the walking axle of mechanical equipment does not meet the preset current range, then alarm information will be triggered, can be adjusted lubricating interval according to alarm information, reduce the situation that the amount of lubricating oil of mechanical equipment is excessive or insufficient, to reduce the potential risk that equipment can appear.

A welding system (100) comprises: power conversion circuitry (110) configured to convert input power to welding power and to output the welding power to a weld circuit; and control circuitry (112) configured to: control the power conversion circuitry (110) to output the welding power according to one or more first pulse cycles at least by outputting the welding power in a voltage-controlled mode according to one or more first target voltages during at least a portion of the one or more first pulse cycles; determine a second target voltage based on one or more measured currents and a current range; and control the power conversion circuitry (110) to output the welding power according to a second pulse cycle at least by outputting the welding power in the voltage-controlled mode according to the second target voltage during at least a portion of the second pulse cycle.

The invention relates to the technical field of electrical parameter detection, in particular to a line fault feature active enhancement detection method and system for a power box, and the method comprises the steps: determining a historical reference overload time period of a current moment, the historical reference overload time period being a time period when a current exceeds a rated current range and is lower than an overcurrent protection threshold value; according to the duration and the current state of the historical reference overload time period, obtaining the voltage bearing degree of the line, thereby obtaining the temperature influence degree of the historical reference overload time period, obtaining the line fault degree through the temperature influence degree, and fusing the line fault degrees of all historical reference overload time periods at the current moment. According to the method, the line fault probability at the current moment is obtained, and the line fault probability can be determined before the line is actually damaged under the current condition, so that the line is prevented from being damaged, and the line fault detection reliability of the power box is improved.

The invention relates to the technical field of metering related to green hydrogen production, and provides an electrical performance metering and testing device and method for a renewable energy hydrogen production system. Comprising a renewable energy power generation side assembly, an electrolytic hydrogen production side assembly, a main controller, a first data acquisition controller, a second data acquisition controller, a variable resolution digitizer, a voltage acquisition module, a current acquisition module, a broadband resistance voltage divider, a broadband current sensor, a voltage range selection assembly, a current range selection assembly and a synchronous scanning switch. A first digital voltmeter, a second digital voltmeter and a direct current sensor. The device is an integrated correlation test platform, solves the problem that no synchronous test platform exists in the prior art, and realizes synchronous measurement of parameters of a power generation side and a hydrogen production side. As an energy value analysis tool of a renewable energy hydrogen production system, an operation model of the system is verified, and performance evaluation and dynamic characteristic research are carried out.

The invention provides an illumination system fault detection method and system, electronic equipment and a storage medium, and relates to the technical field of automatic control. Comprising the following steps: an illumination actuator controls operation of target illumination equipment according to an equipment control instruction issued by an illumination controller, detects a current value and a voltage value of a power supply channel corresponding to the target illumination equipment in real time, and sends the current value and the voltage value to the illumination controller; the lighting controller determines fault information of a loop where the target lighting equipment is located according to the current value and the voltage value of the power supply channel corresponding to the target lighting equipment and the standard current range and the standard voltage range of the target lighting equipment; and the lighting controller uploads the fault information of the loop where the target lighting equipment is located to the upper computer for recording and displaying. According to the scheme, the fault type can be specifically judged, and the accuracy of fault analysis is improved. Dependence on technicians is remarkably reduced, and field troubleshooting difficulty and human input are reduced.

The invention relates to a high-voltage test method and system for an insulation pad assembly line, and relates to the technical field of insulation pads, and the method comprises the steps: collecting the area specification of a detection area; constructing a three-dimensional scene model according to the area specification; selecting a use range based on the three-dimensional scene model and a preset use type; collecting the electric leakage type of the application range; obtaining an electric leakage range according to the electric leakage type and the three-dimensional scene model; obtaining a placement shape according to the electric leakage range and a preset placement specification; obtaining a detection voltage interval and a detection position according to the electric leakage type, the use type and the three-dimensional scene model, and detecting the insulation pad with the placement shape in the detection voltage interval; collecting detection current; and comparing the falling condition of the detection current and the preset safety current interval to output preset abnormity prompt information. The device has the effect of improving the accuracy of the high-voltage test of the insulation pad.

The invention relates to a distance determination method and device, electronic equipment and a readable storage medium, and the method comprises the steps: in a current distance measurement process, sequentially transmitting at least one first detection signal to second electronic equipment until a confirmation message of the second electronic equipment for a first target detection signal in the at least one first detection signal is received, sending at least one first detection signal in the next distance measurement process; receiving a second target detection signal sent by a second electronic device for the first target detection signal in the current distance measurement process, and a first target time difference; and determining the distance between the first electronic equipment and the second electronic equipment in the current distance measurement process according to the second target detection signal and the first target time difference. According to the method disclosed by the invention, the next distance measurement process can be efficiently started, the distance measurement frequency is improved, accurate data transmission is facilitated, and the success rate of distance measurement is improved.

The application discloses a kind of fast response zero point adaptive compensation LDO circuit, it is related to integrated circuit design technical field, including: bias circuit, error amplifier circuit, output drive stage circuit, output stage circuit and zero point adaptive compensation circuit;The bias circuit is error amplifier circuit and output drive stage circuit provide current and voltage bias;Through the error amplifier circuit, level conversion is realized, simultaneously with the P tube bias voltage and N tube bias voltage formed is converted to secondary point;The output drive stage circuit provides the voltage of secondary point to output stage circuit, limits its static current;Zero point adaptive compensation circuit is based on load current variation dynamic adjustment zeroing resistance, dynamically compensates the change of secondary point, so that it can be zeroed in the preset current range by zero point.This application reduces compensation capacitor, saves chip area, and enhances dynamic response speed.In practical application, it can also meet more extensive load current and load capacitance demand.

The invention provides a battery cluster and an energy storage system, the battery cluster comprises a plurality of battery packs, and the plurality of battery packs are connected in series to form a series branch; the high-voltage box comprises a first current branch circuit and a second current branch circuit, the first current branch circuit and the second current branch circuit are electrically connected with the positive electrode and the negative electrode of the series branch circuit respectively, the first current branch circuit comprises a first fuse, and the second current branch circuit comprises a second fuse; the short circuit currents of the first fuse and the second fuse include non-overlapping short circuit current ranges.

The present application relates to the field of communications, and provides a ranging compensation method, an apparatus, and a system, with the aim of implementing a ranging process based on the ranging compensation method. The method comprises: a second device sending a reference ranging value and first information to a first device; the first device receiving the reference ranging value and the first information from the second device, and sending a current ranging value and second information to the second device according to the reference ranging value and the first information; and the second device receiving the current ranging value and the second information from the first device. The reference ranging value is used for determining whether a first compensation value is reliable; the first information is used for indicating a reference signal source type corresponding to the reference ranging value; the second information is used for indicating whether the first compensation value is reliable; the first compensation value is used for compensating for the current ranging value; and the current ranging value is a distance value between the second device and the first device that is obtained from a currently executing ranging procedure. The solution of the present application can be widely applied to the technical fields of communication, artificial intelligence, vehicle networking, smart home networking, and the like.

The application discloses a semiconductor device leakage current detection circuit, and belongs to the technical field of leakage current detection, and solves the problem of how to improve the precision of leakage current detection. A first operational amplifier unit, a second operational amplifier unit, a third operational amplifier unit, a fourth operational amplifier unit and a fifth operational amplifier unit are connected in series, the output ends of the first operational amplifier unit, the second operational amplifier unit, the third operational amplifier unit, the fourth operational amplifier unit and the fifth operational amplifier unit are connected with a plurality of input ends of a multiplexer unit, the output end of the multiplexer unit is connected with an input end of an analog-to-digital converter, and the output end of the analog-to-digital converter is connected with an input end of an MCU. The sampling voltage is amplified by the multiple-stage operational amplifier units, the voltage value output by the operational amplifier unit is collected by the multiplexer after each amplification, and it is judged whether the voltage value is within a preset range, different current ranges are matched step by step, and it is ensured that the signals of each order are within the optimal measurement range of the ADC, so that the test efficiency is effectively improved.