195 results about "Measuring output" patented technology

There is provided a mobile terminal testing device that can improve the accuracy of measurement results. A reference position measurement control unit 18c that measures output power of a DUT 100 at a Reference position, which is any preset measurement position, each time a certain period of time elapses in a case where a total spherical scanning of the DUT 100 is performed, and that, in a case where the output power is equal to or less than a preset regulated Power, interrupts the measurement, excludes measurement data after the previous measurement at a Reference position from the measured value, and enables the measurement to be resumed from the excluded measurement position is provided.

The invention provides a metering data automatic calibration method and system, and the method comprises the steps: obtaining an actual measurement output value of a target intelligent sensor for a measured physical quantity in a normal operation process of metering equipment, accessing a standard reference signal outputted by an external standard device subjected to the traceability of the quantity value, reading a pre-stored standard reference value and a standard threshold value, and carrying out the calibration of the measured physical quantity. According to the actually measured output value, the standard reference value and the standard reference signal, obtaining a standardized output value through a fitting mode; when the standardized output value exceeds a standard threshold value, switching to a calibration mode, providing forward and reverse standard input quantities by an external standard device, acquiring a response signal, and calculating a nonlinear compensation coefficient and a hysteresis correction coefficient; and updating the output correction parameter according to the compensation coefficient. By adopting the scheme of the invention, the cost constraint of different error attention in measurement data calibration can be realized, and the calibration robustness is improved.

The invention discloses a dynamic virtual impedance control method for multi-machine parallel connection of a network construction type energy storage converter, and belongs to the technical field of power electronics. The method aims to solve the problem that accurate reactive power distribution, circulating current suppression, dynamic response and voltage precision are difficult to consider in a multi-machine parallel system through fixed parameter virtual impedance. A dynamic adjustable virtual impedance module is introduced into the voltage outer loop output end of each converter, and virtual resistance and virtual inductance are calculated in real time based on locally measured output current, bus voltage change rate and adjacent machine reactive power deviation information; and the average reactive power of the system is estimated through a phase synchronization mechanism under the condition of no communication so as to realize multi-machine cooperation. According to the method, the reactive power distribution error is less than 5%, the bus voltage drop is less than 3%, the high-frequency circulating current is controlled within 5% of the rated current under all working conditions, and the dynamic performance and robustness of the system are remarkably improved.

Disclosed is a system for zero voltage switching in a power converter with a first half-bridge and a second half-bridge. The first half-bridge has a first set of transistors and output inductor. The second half-bridge has a second set of transistors and auxiliary inductor. A current sensing means measures, at switching cycle scale, average and maximum current values of output inductor and average, minimum and maximum current values of auxiliary inductor. A voltage sensing means measures input and output voltages of first and second half-bridge. A controller is configured to compute dead times of pulse width modulation control signal of second half-bridge, generate pulse width modulation control signal of second half-bridge and to adapt dead times of first half-bridge.

Systems and methods for ripple reduction for direct current-to-direct current (DC-DC) converters are disclosed. In one aspect, ripple is reduced by measuring a load current proxy and providing a fast-acting feedback loop to the DC-DC converter to adjust current levels to a desired level. In particular, a change in voltage at and output may be measured, and its derivative (dV / dt) calculated and multiplied by a capacitance to determine the load current. In a second aspect, two DC-DC converters are used, where low-frequency current changes are handled by a first DC-DC converter, mid-frequency current changes are handled by the second DC-DC converter, and fast-frequency current changes are handled by the capacitor associated with the capacitance of the first aspect.

The invention relates to the technical field of wireless power transmission, in particular to a fuzzy PID wireless power transmission control method, system and device based on load estimation, and the method comprises the steps: measuring an output voltage and an output current, and estimating the load information of a wireless power transmission line; an equivalent circuit model is constructed based on the load information, and the relation between the output active power of the full-bridge inverter and the load is established; monitoring load information in real time, identifying system interference and load change according to a preset change rate threshold value, and judging whether to execute fuzzy PID self-tuning control or not; when fuzzy PID self-tuning control is executed, fuzzy control rules are established by fuzzifying the input quantity error and the error change rate; and performing fuzzy reasoning according to a fuzzy control rule to obtain a control quantity, and generating a corrected PID control parameter through a defuzzification method. According to the invention, the problem of limitation of a traditional PID control method in a wireless power transmission system when facing nonlinearity, dynamic change and interference is effectively solved.

Systems and techniques are provided for aggregating data output from multiple Inertial Measurement Units (IMUs) for a localization of an autonomous vehicle (AV). An example method includes receiving a first measurement output from a first IMU associated with a first sensor of an AV and a second measurement output from a second IMU associated with a second sensor of the AV; adjusting the first measurement output based on a first offset vector corresponding to the first IMU to obtain a first adjusted measurement output; adjusting the second measurement output based on a second offset vector corresponding to the second IMU to obtain a second adjusted measurement output; and determining a pose of the AV based on the first adjusted measurement output and the second adjusted measurement output.

The invention discloses a spurious suppression method based on random phase shift, and the method comprises the steps: adjusting the amplitude and phase of each channel, enabling the amplitude and phase of each channel to be consistent, synthesizing the signals of each channel, and measuring the SFDR value S1 of a system; phase shifting is carried out on the input signal M1, the spurious phase in the output signal is measured, the spurious phase change M2 before and after phase shifting of the input signal is calculated, and the multiple relation n between M2 and M1 is calculated; all channels are divided into two groups randomly, the first group of channels does not change the phase of the input signal, and the second group of channels shifts the phase of the input signal, that is, the input signal is respectively input into a digital-to-analog converter; performing reverse phase shift on the output signals of the second group of channels in a digital domain, namely, recovering the phase of the output signals to be consistent with the phase of the first group of output signals, and outputting the phase difference pi between spurious output and spurious output of the first group of channels; and synthesizing two groups of signals, measuring the SFDR value S2 of the system, and comparing the SFDR value S2 with S1.

A specific logic circuitry of a semiconductor Integrated Circuit (IC) is measured by a sensor. The sensor includes: a signal splitter that splits a signal from the specific logic circuitry into two test paths; a delay element that receives and applies a delay to a first test path, the delay based on a predetermined timing margin that is selected from a group of discrete timing margin values comprising a shortest timing margin value and at least one longer timing margin value; a comparison circuit that compares the delayed first test path and a second test path and provides a measurement output according to the comparison for an instance of measuring; and a controller that sets the predetermined timing margin such that, over the instances of measuring, a frequency of selection of the shortest timing margin value is higher than a frequency of selection of each longer timing margin value.

The present application relates to a device for testing electrical performance parameters of bipolar transistors, comprising a test fixture for operatively mechanically and electrically coupling a bipolar transistor to be tested, a test circuit for applying a test input signal to the transistor under test, a measurement circuit for measuring an output signal of the transistor and determining electrical performance parameters thereof, and a controller for automating the testing process and analyzing the measurement data, wherein the test fixture has fluid cavities formed through its length by one or more flow holes, and at least one cooling section in the form of a uniform or non-uniform spiral is arranged in each fluid cavity to extend along the corresponding fluid cavity. The test circuit comprises a signal generator for generating the input signal and a power supply for providing necessary bias voltages to the transistor; the measurement circuit comprises an oscilloscope for measuring the output signal and a computer for processing the measurement data; the controller is capable of automatically acquiring and analyzing the measurement data of the transistor to determine the electrical performance parameters.

The invention relates to a variable-frequency adaptive protection control method and system based on dynamic vector correction, and belongs to the field of power protection control. The method comprises the following steps: measuring an output instantaneous frequency through three-mode fusion; performing dynamic correction on the rotating coordinate system based on the instantaneous frequency to obtain a correction amplitude; performing three-domain confidence factor correction based on the correction amplitude to obtain a comprehensive confidence coefficient; cooperative compensation is carried out based on the comprehensive confidence coefficient and the instantaneous frequency, and the cooperative compensation comprises protection constant value adaptive compensation and excitation-synchronous cooperative compensation which are respectively used for compensating an over-current protection constant value and excitation voltage; and obtaining an error index, carrying out real-time closed-loop verification based on the error index, and optimizing cooperative compensation. Frequency conversion adaptive protection control is realized by means of dynamic vector correction, three-domain confidence evaluation, excitation-protection cooperative compensation and the like.

The invention discloses a temperature monitoring system suitable for a fusion reactor low-clutter system and an over-temperature protection method. The temperature monitoring system comprises a high-speed temperature acquisition unit, a thermocouple sensor, an industrial control upper computer and a database server. A microwave excitation signal of the microwave excitation source is amplified by the microwave source klystron and then transmitted to the low-clutter coupled antenna through the microwave transmission line, and a plurality of temperature measuring points are arranged on the waveguide surface of the microwave transmission line and the end face of the low-clutter coupled antenna. Measurement output ends of the thermocouple sensors are uniformly accessed and gathered into the high-speed temperature acquisition unit and are uploaded to the industrial control upper computer, and the industrial control upper computer records and stores acquired multi-channel real-time temperature data, control signal output values and alarm events into the database server. The method has the advantages that early warning and temperature regulation are carried out for potential thermal runaway faults, so that the equipment safety of a high-power microwave transmission device and the normal operation of a low-clutter current driving system are guaranteed.

A method for detecting whether a battery (110) is disconnected from a battery charger (120). The method comprises determining (S1) if the battery charger (120) is charging the battery (110), and obtaining (S2) a charger model indicative of a first expected output voltage (Umod) of the battery charger (120) as a function of time when the battery charger (120) is connected to, but not charging, the battery (110). When it is determined that the battery charger (120) is not charging the battery (110), the method comprises: measuring (S3) a first measured output voltage (Umeas1) of the battery charger (120) as a function of time; and determining (S4) if the battery (110) is disconnected from the battery charger (120) based on whether the first measured output voltage (Umeas1) differs from the first expected output voltage (Umod) by more than a first threshold value at one or more corresponding points of time.

A method for detecting a deviation of a position sensor is provided, which detects a deviation in the mounting positions of position sensors of a motor. The invention is a method for detecting a deviation of a position sensor, wherein the method includes: switching on an energy supply to a U-phase conductor wire, a V-phase conductor wire and a W-phase conductor wire.-Conductor wire of a motor to rotate a rotor of the motor; switching off the power supply to the U-phase conductor wire, the V-phase conductor wire and the W-phase conductor wire when a rotor speed reaches a predetermined speed; measuring induced voltages generated in the U-phase conductor wire, the V-phase conductor wire and the W-phase conductor wire in the off state, calculating the positions of a U-phase tooth, a V-phase tooth and a W-phase tooth of the motor based on the induced voltages and measuring outputs from a U-phase position sensor, a V-phase position sensor and a W-phase position sensor; and calculating differences between intended and actual mounting positions of the U-phase position sensor, the V-phase position sensor, and the W-phase position sensor by comparing the calculated positions with the outputs. [Selected drawing].

Embodiments of the present application disclose a current measurement method and device, computer equipment and a computer readable storage medium. The method comprises obtaining a measurement range corresponding to a plurality of measurement ranges in a current measurement device and a calibration point, the calibration point comprising a calibration input value corresponding to each range and a corresponding calibration output value; inputting a plurality of input currents within the measurement range in the current measurement device to obtain a measurement output value corresponding to a current input value of the measurement range based on the input current; determining a linear mapping relationship corresponding to each range based on the calibration input value and the calibration output value, and calculating an input error corresponding to the current input value based on the linear mapping relationship; constructing an error mapping relationship corresponding to each range according to the measurement output value and the input error; and measuring a to-be-measured current based on the linear mapping relationship and the error mapping relationship. In this way, the accuracy of current measurement is improved, the measurement range of current measurement is improved, and the efficiency of current measurement is improved.

The invention belongs to the technical field of high-speed data testing, and discloses a high-speed signal eye pattern testing method and system based on automatic testing equipment, and the method comprises the steps that a high-speed signal configuration vector is divided into a configuration section and an action section, the configuration section is used for rapidly configuring a testing environment, and the action section is used for controlling a testing action; in the action section, constructing a virtual clock as a reference Trigger signal, and synchronizing the virtual clock and a high-speed signal to be detected to the same sequence group; performing waveform capture on the synchronized high-speed signal to be detected, and generating a two-dimensional array formed by sampling time and level values; the two-dimensional array is processed by a difference peak-valley segmentation method, the eye height, the rising / falling time and the jitter are measured based on a processing result, automatic control, measurement and output of test data can be realized through testing of automatic test equipment, data analysis and processing are facilitated, the test efficiency is improved, and interference of human factors is avoided.

The application provides a differential pressure transmitter comprehensive compensation method based on Kriging interpolation and cubic spline interpolation, which comprises the following steps: measuring the calibration output voltage of a differential pressure transmitter at multiple temperature calibration points, static pressure calibration points and differential pressure calibration points to obtain data calibration points; fitting a variogram function theoretical model by using Kriging interpolation and obtaining a compensation matrix; establishing an output voltage model by using cubic spline interpolation; when the measured value of the ambient temperature is a temperature calibration point, the measured value of the static pressure is directly brought into the output voltage model to obtain a theoretical voltage, three calibration output voltages adjacent to the theoretical voltage are selected, a differential pressure function relationship is established by using cubic spline interpolation, and the measured output voltage is brought into the differential pressure function relationship to obtain a to-be-measured differential pressure; when the measured value of the ambient temperature is not a temperature calibration point, a compensation coefficient is determined by using the variogram function theoretical model, and the to-be-measured differential pressure is calculated by using the compensation coefficient. The application adopts cubic spline interpolation at the modeling temperature and adopts Kriging interpolation at the non-modeling temperature, so that the algorithm with large calculation amount can be used to improve the compensation precision, the repeated interpolation at each temperature and static pressure interval is avoided, the workload is reduced, and the real-time performance of the compensation is improved.

The invention relates to a low-dropout linear voltage stabilizing circuit of a self-adaptive load capacitor, and belongs to the field of analog integrated circuit design. According to the circuit, the problem that the phase margin is reduced and even oscillates due to the fact that a fixed compensation network cannot adapt to wide-range load capacitance change in a traditional scheme is solved. The key points of the technical scheme are as follows: an actual value of a load capacitor connected with an output node is accurately measured through a load capacitor detection circuit in a power-on stage; and controlling the switchable phase compensation network to be automatically switched to an optimal compensation gear matched with the capacitance value based on the measurement result. The scheme is mainly used in various power supply management chips, so that the low dropout linear regulator can maintain stable output and optimized phase margin under any load capacitance from a nano-method magnitude to a micro-method magnitude.

This utility model relates to a six-dimensional torque sensor system. Through integrated circuit design and packaging within the six-dimensional torque sensor, high-precision and highly sensitive deformation sensing and electrical signal conversion output are achieved via strain gauges on the elastic beams of the main frame structure. After specific measurement using a half-bridge differential Wheatstone bridge, the measured signal is amplified, filtered, and converted from digital to analog data by an ADC chip before being sent to a lower-level computer. The lower-level computer then reads the acquired sensor measurement signal, forming a high-precision circuit design specifically matched to the six-dimensional torque sensor. The coordinated installation of the strain gauges, half-bridge differential Wheatstone bridge, and ADC chip makes it less susceptible to environmental factors and effectively suppresses noise interference while achieving high signal gain, effectively realizing the measurement output function of the six-dimensional torque sensor.

The disclosure relates to self-calibration of non-linearity in a digital to analog converter (DAC). Example embodiments include a method for calibrating non-linearity of a segmented non-binary DAC in a self-calibrating DAC system, the method comprising: providing first calibration input digital signals to a thermometric weighted segment and measuring first outputs of the DAC with an ADC; providing second calibration input digital signals to the thermometric weighted segment and measuring second outputs of the DAC with the ADC; calculating a first scaling factor for first switches and resistive elements by dividing each of the second outputs of the DAC by a difference between adjacent ones of the first outputs of the DAC; calculating a second scaling factor for second switches from a sum of the first outputs of the DAC divided by a measured output range of the DAC; and storing the first and second scaling factors in a memory module.

The invention discloses a control method of an efficient networking type energy storage converter applied to a hydrogen production system, and the method comprises the steps: starting an energy storage converter and hydrogen production system equipment, initializing a controller, a sensor and a communication module, and building communication connection; acquiring an active power demand signal and a reactive power demand signal in real time, and measuring an output voltage instantaneous value and an output current instantaneous value; the collected data are preprocessed, the power demand change of the hydrogen production system and the output state change trend of the energy storage converter are predicted, and whether the operation condition of the hydrogen production system exceeds a preset range or not is judged; line impedance parameters and load dynamic characteristics of the hydrogen production system are monitored in real time, and a self-adaptive virtual impedance control algorithm is adopted to dynamically adjust a virtual impedance value; state information of the energy storage converter is transmitted to a monitoring center in real time through an encrypted communication protocol, a control instruction is received, and data traffic is managed by adopting a load balancing algorithm. The stability and efficiency of the hydrogen production system are remarkably improved.

The present invention discloses a measuring device, comprising a base, a first bracket, and a second bracket. The first bracket is used to connect to a system to be measured, and the second bracket is spaced apart from the first bracket and is used to connect to a displacement output terminal of the system to be measured. One of the first bracket and the second bracket is provided with a displacement measuring member, and the other is provided with a displacement measuring mating member. The first bracket has a first state and a second state; the second bracket has a third state and a fourth state. When the first bracket is in the first state, the second bracket is in the third state; when the first bracket is in the second state, the second bracket is in the fourth state; and the maximum value of the first range is less than the minimum value of the second range. The measuring device can measure output displacements in different ranges, reducing measurement costs.

The invention discloses a digital twinborn model construction method and device of a coal-fired power generation unit. The method comprises the steps that a mechanism model used for describing the running state of a coal-fired unit is constructed based on the structure and the running mechanism of the coal-fired unit; predicting historical input data based on the mechanism model to obtain mechanism prediction outputs corresponding to the historical input data; based on the actual measurement output and the mechanism prediction output of the same historical input data and the feature vector of unit operation, performing model training on the initial data driving model to obtain a target data driving model; and constructing a target digital twin model based on the mechanism model and the target data driving model. According to the method, the digital twinborn model of the coal-fired power generation unit can be accurately and reasonably constructed, and a foundation is laid for subsequent accurate prediction of the running state of the coal-fired power generation unit.

A technique for recursively determining the modulation index for controlling a DC-AC inverter is disclosed. The modulation index can first be selected. The input voltage to the power inverter can be measured. Based on the input voltage and the selected modulation index, the output voltage of the power inverter may be estimated. The output current of the power inverter can be measured. Using the estimated output voltage and the measured output current, the active power and reactive power can be determined. Using the active power and reactive power, the updated modulation index can be determined. The updated modulation index coefficient can be used to generate a pulse-width modulated signal used to control the power inverter.

The application discloses a kind of complex dynamic network system fault-tolerant control method, device and storage medium, belong to fault-tolerant control research technical field, its method includes obtaining the measurement output signal and control input signal of each node in complex dynamic network system;The measurement output signal and control input signal are input into the adaptive sliding mode observer designed in advance, generate system state estimation value, and through system state estimation value, drive state estimation error to converge to zero;Based on system state estimation value, through the adaptive fault-tolerant controller designed in advance, solve controller gain matrix, and through controller gain matrix drive system state estimation value and the tracking error of target node state converges to zero.The application is improved further to system performance under the condition that system is stable at present stage, improves the performance of system, and can output correct value under the condition that there is external attack.

A method for calibrating phase nonlinearity of a digital-to-time converter is provided. The method includes generating a reference signal using a phase-locked loop (PLL) based on a control word. The reference signal has a frequency equal to the frequency of an output signal of the digital-to-time converter. Furthermore, the method includes measuring a temporal sequence of transitions of the output signal from a first signal level to a second signal level and a temporal sequence of transitions of the reference signal from the first signal level to the second signal level. The method also includes adjusting a first entry of a lookup table based on the measured temporal sequence.

To provide a force measuring device of sufficient accuracy combined with an appropriate and simple configuration.SOLUTION: A force-measuring device based on the principles of electromagnetic force compensation, comprising an electronic circuit driven by a direct current, the electronic circuit comprising an inductor, in particular a coil, a control unit for controlling a compensation force by controlling a current through the inductor as a function of a force to be measured, and means for providing a measurement output indicative of the force to be measured, wherein the control of the current comprises a dynamic switching of two switch states associated with two conducting directions of the inductor (1L, 2L).SELECTED DRAWING: Figure 2

A method for detecting whether a battery (110) is disconnected from a battery charger (120). The method comprises determining (S1) if the battery charger (120) is charging the battery (110), and obtaining (S2) a charger model indicative of a first expected output voltage (Umod) of the battery charger (120) as a function of time when the battery charger (120) is connected to, but not charging, the battery (110). When it is determined that the battery charger (120) is not charging the battery (110), the method comprises: measuring (S3) a first measured output voltage (Umeas1) of the battery charger (120) as a function of time; and determining (S4) if the battery (110) is disconnected from the battery charger (120) based on whether the first measured output voltage (Umeas1) differs from the first expected output voltage (Umod) by more than a first threshold value at one or more corresponding points of time.

The present invention discloses an aircraft aileron neutral positioning device. This device uses two voltmeters with measurement outputs to measure the position voltage signal values output by an electric mechanism with position feedback, and uses the contact points of a relay connected to the output ends of the voltmeters to control the on-off of the control circuit of the electric mechanism, so as to accurately position the electric mechanism at the neutral position. This device has an accurate positioning operation mode and a free operation mode, which can meet the requirements of various usage scenarios. This device and method use two voltmeters, which can reduce (eliminate) the errors caused by the sensitivity of the control system during the extension and retraction actions of the aircraft electric mechanism, enabling the aircraft electric mechanism to stop accurately at the same position during the extension and retraction actions. The voltmeter can set the voltage threshold of the output terminal according to a predetermined rule within the measurement range, and can achieve accurate positioning at any position within the full stroke range.

The invention relates to the technical field of intelligent detection, particularly discloses an automatic detection system and method for optical characteristics of a semiconductor laser, and aims to solve the problems of lack of automatic wavelength test, poor multi-device collaboration and insufficient data quality control in the prior art. A laser driver, a power meter and a spectrograph are automatically identified and stable communication is established by scanning a communication port and inquiring equipment identifiers, test types, current sequence parameters and temperature setting parameters input by a user are received, equipment is controlled to execute automatic test according to the test types, output power and working voltage are measured through power test, and the output power and the working voltage are measured through temperature control. The wavelength test measures the output wavelength, collects data after the output of the laser is stable during the test, carries out signal-to-noise ratio screening on the wavelength data, generates a PIV characteristic curve and a wavelength tuning curve based on the processed data, and displays the PIV characteristic curve and the wavelength tuning curve on a user interface. According to the invention, cooperative detection of PIV and wavelength characteristics can be realized, data reliability and test efficiency are improved, and scene requirements of precise spectral analysis are met.