265 results about "Current range" patented technology

The invention provides an intelligent wire harness adaptive control method and system, and the method comprises the steps: S2, extracting a corresponding current range and a communication protocol from an output mode library according to an equipment type judgment result, and determining an initial output parameter; s4, executing the adjusted output parameters through a low-power-consumption communication module, obtaining equipment operation state data, and judging whether the real-time operation requirement is met or not; s6, after the pre-adjustment parameters are executed, equipment response data and energy consumption data are obtained, and whether system overload or power consumption exceeding exists or not is judged; s8, updating the equipment feature database and the output mode library according to the adjusted operation configuration, and obtaining updated collaborative performance indexes and energy consumption indexes; and S9, if the collaborative performance index and the energy consumption index do not reach the performance threshold, repeatedly executing the combined optimization process of the dynamic adjustment algorithm and the feature analysis algorithm. According to the invention, high-efficiency cooperation and energy consumption optimization of the wire harness and the intelligent equipment are realized.

The invention relates to the technical field of lasers, and discloses a laser temperature adjusting method and device, and the method comprises the steps: determining a second thermistor temperature based on a predetermined temperature compensation coefficient, a first environment temperature, a second environment temperature and a first thermistor temperature, the temperature of the thermistor at the second environment temperature is adjusted to be the second thermistor temperature; wherein the process of predetermining the temperature compensation coefficient comprises the following steps: carrying out a wavelength change test on the laser chip at a first preset temperature and within a preset current range, and determining wavelength change data corresponding to the laser chip; and calculating according to the first relation of the laser chip wavelength along with the change of the environment temperature, the wavelength change data, the temperature tuning coefficient and the test environment temperature change data to obtain a temperature compensation coefficient. Therefore, a temperature compensation coefficient is introduced to counteract the influence of ambient temperature fluctuation on the actual temperature of the laser chip, and the output wavelength stability of the laser is effectively improved.

The invention relates to power semiconductor device on-line monitoring and power electronic system control, in particular to a SiC MOSFET conduction current extraction circuit and method, high-frequency oscillation interference is effectively suppressed through a second-order passive RC filter circuit, a measurement error less than or equal to 1.5% is realized within a current range of 50A-300A in combination with an accurate mathematical model established by a depth symbol optimization algorithm, and the measurement accuracy is improved. The requirement of the intelligent gate driver on high-precision current feedback is met, and the measurement precision is remarkably improved; the pulse width direct analysis technology is adopted, a traditional active integrator and a digital decoding link are omitted, the system response delay is smaller than or equal to 500 ns, microsecond-level over-current protection can be supported, the response speed and the real-time performance are optimized, and the system safety in a high-frequency application scene is remarkably improved.

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 computer system determines a compensation current adapted to counteract at least parts of a charge equalization current expected to be generated by an activation of an additional battery pack in parallel connection with one or more currently activated battery packs. The compensation current is determined as a current range between a lower and upper compensation current limits. The lower limit is based on a voltage of the additional battery pack, and a voltage and impedance of the currently activated battery packs. The upper limit is based on a maximum discharge ability of a system powered by the currently activated battery packs, a maximum discharge ability of the currently activated battery packs, a voltage and impedance of the additional battery pack, and a voltage and impedance of the one or more currently activated battery packs.

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.

The invention belongs to the field of electric energy meters, particularly relates to an automatic compensation calibration method for electric energy metering errors of an electric energy meter, and aims to solve the technical problems that a CORDIC algorithm is difficult to give consideration to efficiency and precision and an existing compensation method is difficult to correct multi-dimensional nonlinear errors under wide temperature and wide flow. Outputting an uncorrected x-axis component and a final accumulated phase angle, wherein the improved CORDIC iterative operation comprises M times of coarse rotation iteration and P times of fine rotation iteration; s2, performing amplitude correction on the uncorrected x-axis component to obtain a corrected instantaneous current amplitude; and S3, performing reconstruction by using the corrected instantaneous current amplitude and the final accumulated phase angle to obtain a corrected instantaneous current value, multiplying the corrected instantaneous current value by the instantaneous voltage value to obtain instantaneous active power, and performing accumulated integration on the instantaneous active power to obtain a compensated and calibrated electric energy value. According to the invention, high-precision metering performance of the electric energy meter in a wide current range and a wide temperature change range can be ensured.

The present disclosure provides a control circuit and a control method of a bistable permanent magnet mechanism. The control circuit includes five switches, a diode and a control unit for controlling the five switches to be turned on and turned off. The control circuit enables the positive and the negative of the current passing through the coil to be adjustable at any time and avoids load breaking, without a complicated design of a driving circuit, thereby reducing the cost. It can also realize PWM control, adapt to a larger current range and different bistable permanent magnet mechanisms, and has a wide range of application scenarios.

The invention discloses a cable-beam combined structure 1 / 2 subharmonic resonance vibration reduction method. The method comprises the following steps that S1, the optimal damping force needed by a cable in the current motion state is obtained according to a time-lag vibration reduction rule; s2, calculating a target current required by the MR damper according to the obtained optimal damping force; s3, mapping the target current to a current interval which can be actually applied by the MR damper by using a mapping algorithm to obtain a mapping current; s4, adjusting individual overlarge mapping current to obtain applied current; and S5, current is applied to the MR damper so as to control the cable-beam combined structure. According to the method, the optimal damping force and the target current are accurately calculated, and the time-delay selection rule is combined, so that 1 / 2 subharmonic resonance can be accurately inhibited, the vibration amplitude of the cable-beam composite structure under the specific frequency is effectively reduced, the fatigue damage risk of the structure is reduced, and the service life of the bridge is prolonged.

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.

A reference buffer with wide output voltage and current range is provided. A reference buffer includes an error amplifier comprising a first input, a second input, and a first output, wherein the amplifier is configured to generate an output signal indicative of an error between an output reference signal and an internal reference signal. The reference buffer further includes a first voltage follower circuit configured to generate the output reference signal based, at least in part, on the output signal of the error amplifier, wherein the first voltage follower comprises a third input and a second output, and wherein the second output is coupled to the second input of the error amplifier.

This invention relates to the field of laser technology and discloses a method and apparatus for adjusting the temperature of a laser. The method includes: determining a second thermistor temperature based on a predetermined temperature compensation coefficient, a first ambient temperature, a second ambient temperature, and a first thermistor temperature, so that the temperature of the thermistor at the second ambient temperature is adjusted to the second thermistor temperature; wherein, the process of determining the temperature compensation coefficient in advance includes: performing wavelength change tests on a laser chip within a predetermined current range and at a first predetermined temperature to determine the corresponding wavelength change data of the laser chip; calculating the temperature compensation coefficient based on a first relationship between the laser chip wavelength and ambient temperature, the wavelength change data, the temperature tuning coefficient, and the test ambient temperature change data. This temperature compensation coefficient is thus introduced to offset the influence of ambient temperature fluctuations on the actual temperature of the laser chip, effectively improving the stability of the laser's output wavelength.

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 present invention provides a battery SOC estimation method and device, which includes: collecting charge and discharge currents at a preset sampling period and obtaining the current battery capacity corresponding to the charge and discharge currents; calculating the current integral capacity corresponding to the charge and discharge currents; determining the corresponding current battery capacity weight and current integral capacity weight based on whether the charge and discharge currents meet the corresponding preset current range; and calculating the actual remaining capacity corresponding to the charge and discharge current based on the current battery capacity, current battery capacity weight, current integral capacity, and current integral capacity weight corresponding to the charge and discharge currents. By using a weight distribution method, the accuracy of estimating the actual remaining capacity of the battery is greatly improved.

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.

The application relates to the technical field of servo motor testing, in particular to a motor automatic debugging method and system. The method comprises the following steps: receiving a mode test instruction, entering a debugging mode of a servo motor, executing a correction mode, running the servo motor to a first preset speed, and correcting an encoder of the servo motor; executing a zero adjustment mode, running the servo motor to a second preset speed, finding a zero point, and storing the zero point in the encoder; executing a running test mode, running the servo motor at a rated speed to detect whether a target current of the servo motor at the rated speed is within a preset current range; when the target current is within the preset current range, executing a parameter writing mode instruction, and writing motor parameters corresponding to the servo motor into the encoder; writing the motor parameters into a servo driver, and completing debugging, wherein the servo server corresponds to the servo motor.

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 invention relates to the field of vehicle control, and discloses a battery control method and system for a golf cart, and the system comprises the steps: monitoring the battery parameter information of the golf cart in real time; the driving condition information of the golf cart is monitored in real time; the driving working conditions comprise accelerated driving, constant-speed driving, downhill driving, braking condition and load of the golf cart; judging a battery state according to the battery parameter information; according to the battery state, the driving working condition information, a preset battery voltage range, a preset battery current range and a preset load range, current and voltage of the battery during charging and discharging are adjusted, and the battery is charged to the set electric quantity; the charging and discharging temperature of the battery is adjusted according to a preset battery temperature range; and adjusting a battery charging capacity threshold according to the battery state and the driving condition information. The safety of the golf cart and the use efficiency of the battery can be effectively improved, the service life of the battery is prolonged, and stable operation of the golf cart under different working conditions is ensured.

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.