171results about "Frequency to amplitude conversion" patented technology

A method includes accessing a material database associating each of a plurality of materials with one or more corresponding resonance frequencies; for each material of at least a subset of the plurality of materials in the material database: transmitting, via an RF transmitter, an RF signal into a target at a first resonance frequency for each material; receiving, via an RF receiver, a response signal from the target; and analyzing the response signal for resonance characteristics that indicate a presence of each material in the target; generating a report of each material in the target indicated by the resonance characteristics; and integrating the report with at least one of: a timestamp; image or video data from a camera; or geolocation data from a geolocation sensor.

The invention discloses a method and a device for detecting networking and grid-connected capabilities of a networking type energy storage system, and belongs to the field of power system detection. The method comprises the following steps: disconnecting the energy storage system from an external power grid, testing whether the energy storage system is independently started or not, and establishing a stable voltage; a dynamic power compensation algorithm is adopted to ensure that the voltage and the frequency are kept stable under load fluctuation, and a time domain response analysis method is adopted to ensure that the recovery time is less than or equal to 200ms; the grid-connected power is gradually increased or reduced, and the adjustment and response capability of the system within the rated power range of 0-100% is tested; applying voltage disturbances with different amplitudes, observing the dynamic response of the tested energy storage system, and testing whether the system can operate stably and keep active power output; a main power grid is simulated to be disconnected, whether an energy storage system recognizes and enters an island mode is detected, and the island detection speed is increased by using an improved positive and negative sequence impedance measurement method. A positive and negative sequence impedance measurement algorithm is adopted, the disconnection state of the main power grid is detected more quickly, island detection time is remarkably shortened, and fluctuation of voltage and frequency is reduced.

An integrated circuit can include frequency monitoring circuitry. The frequency monitoring circuitry may include a voltage based frequency monitoring circuit for monitoring an input clock signal having an input clock frequency within a first set of frequencies and a coarse frequency monitoring circuit for monitoring an input clock signal having an input clock frequency within a second set of frequencies different than the first set of frequencies. The voltage based frequency monitoring circuit can be configured to generate an output voltage having a first value when the input clock frequency is greater than a reference frequency and having a second value when the input clock frequency is less than the reference frequency. The coarse frequency monitoring circuit can include a reference counter and an input clock counter that generates a count value used to compute the input clock frequency.

A method and apparatus for converting an input frequency to a voltage signal using a passive band-pass filter. The method includes providing an input signal having a specified frequency and amplitude to a passive band-pass filter. The method also includes obtaining an attenuated signal corresponding to the input signal from the passive band-pass filter. The method also includes providing the attenuated signal to a peak detector to obtain a direct current (DC) signal having an output voltage proportional to the specified frequency. The passive circuitry includes a first circuit to receive an input signal having a specified frequency and amplitude, and output an attenuated signal corresponding to the input signal. The passive circuitry also includes a second circuit to convert the attenuated signal to a DC signal having an output voltage proportional to the specified frequency.

The invention relates to the technical field of lightning arrester state monitoring, in particular to a lightning arrester operation state remote online monitoring system which comprises a remote monitoring platform, an information acquisition unit, a resistive analysis unit, a resistive interference unit, a state division unit, a management demand unit and a management response unit. According to the method, the health condition of zinc oxide in the lightning arrester is analyzed from the perspective of resistive current, analysis is carried out from the perspective of the environment to know the operation interference level condition of the environment on the lightning arrester, analysis is carried out in an information feedback and information fusion mode, so that the state influence of the lightning arrester is graded, and the operation interference level condition of the lightning arrester is obtained. According to the method, the state influence grade condition of the lightning arrester is known, meanwhile, analysis is carried out by combining the state performance condition of the lightning arrester, so that the state risk of the lightning arrester is comprehensively quantified, and reasonable and targeted management is carried out according to the dynamic trend condition of the state risk, so that the state stability and reliability of the lightning arrester are improved.

A method includes accessing a material database associating each of a plurality of materials with one or more corresponding resonance frequencies; for each material of at least a subset of the plurality of materials in the material database: transmitting, via an RF transmitter, an RF signal into a target at a first resonance frequency for each material; receiving, via an RF receiver, a response signal from the target; and analyzing the response signal for resonance characteristics that indicate a presence of each material in the target; generating a report of each material in the target indicated by the resonance characteristics; and integrating the report with at least one of: a timestamp; image or video data from a camera; or geolocation data from a geolocation sensor.

The invention relates to the technical field of new energy power generation, and particularly provides a multi-level frequency support performance synchronous test method and device for an optical storage power station, and the method comprises the steps: generating a frequency test signal through a pre-constructed power system frequency response model; connecting the tested optical storage power station to a pre-constructed test system, and testing the tested optical storage power station based on the frequency test signal to obtain output power and frequency at a grid connection point of the tested optical storage power station; determining a test result of the tested optical storage power station based on the output power and frequency at the grid-connected point of the tested optical storage power station; wherein the test result comprises at least one of the following: the ratio of the initial response power to the initial frequency change rate, the ratio of the response power extreme value to the frequency change extreme value, and the integral electric quantity qualified rate. According to the technical scheme provided by the invention, synchronous testing of the multi-level frequency support performance of the optical storage power station can be realized.

The present invention relates to a wireless power transmission system for detecting an optimal resonance frequency and a method of detecting an optimal resonance frequency using the same, and provides a system and method for detecting an optimal resonance frequency for maximum wireless power transmission, the system and the method enabling an optimal resonance frequency for maximum power transmission to be effectively and quickly detected and enabling an optimal resonance frequency to be more precisely and accurately detected and found, even if a system usage situation changes, such as when a power transmission distance changes, in a wireless power transmission system of a magnetic resonant coupling scheme.

The invention discloses an electric energy metering method and device based on harmonic self-adaptive observation and zero point tracking type SOGI-FLL. The electric energy metering method comprises the following steps: step 1, carrying out ADC sampling on voltage and current signals of a power grid; 2, performing frequency rapid estimation on the voltage signal based on a zero point tracking frequency-locked loop, and obtaining a fundamental wave angular frequency of a power grid in real time; step 3, constructing adaptive observers of voltage and current by using the fundamental wave angular frequency, and estimating parameters of fundamental waves, harmonic waves and direct current components in voltage and current signals in real time through an adaptive law based on Lyapunov stability; 4, according to the parameter estimation value, the amplitude and phase of the voltage and current are calculated; and step 5, calculating active power and reactive power of each harmonic based on the voltage and current amplitudes and phases obtained in the step 4, and summing to obtain total active power and total reactive power so as to realize metering of active electric energy and reactive electric energy. According to the invention, rapid and accurate metering of fundamental wave and harmonic wave electric energy under complex working conditions is realized.

The invention discloses a batch test compensation system for G sensitivity of a quartz crystal oscillator, and belongs to the technical field of electronics. Comprising a three-axis orthogonal rotation test frame and an upper computer. The triaxial orthogonal rotation testing frame is provided with a testing plate serving as a crystal oscillator carrier, and the testing plate realizes the functions of orientation, pitching and polarization rotation through the triaxial orthogonal rotation testing frame; the rotation rate and the current real-time rotation angle of the three-axis orthogonal rotation test frame can be output; the upper computer performs algorithm fitting calculation on the acquired data, calculates a linear relation between crystal oscillator frequency change and acceleration change, and obtains a compensation function based on three axial acceleration values # imgabs0 #; and the upper computer acquires data and writes an obtained compensation function into a register in the crystal oscillator. The frequency offset of the crystal oscillator is corrected through the digital compensation technology, the test compensation process is simple and convenient, and batch production can be achieved.

Systems and methods for estimating the state of health (SOH) of a battery are provided. The system includes a database, a parameter processing module, and an SOH estimation module. The database stores current and voltage data measured at a specific sampling rate during battery charging. The parameter processing module obtains response functions in the frequency domain, differential capacity, and differential voltage based on the stored current and voltage data and uses them to obtain parameters for SOH estimation. The SOH estimation module uses some or all the obtained parameters to estimate the SOH.

The invention relates to the technical field of electronic circuits, in particular to a differential transformer resonant bridge resonant frequency detection and adjustment device and method, a rapid tuning capacitor bridge is composed of a plurality of tuning capacitors, and the resonant frequency is changed by adjusting the capacitance values of the tuning capacitors connected into a circuit; in addition, an analog-to-digital conversion circuit is used for collecting voltage data, and the upper computer is used for directly observing the minimum value of an output voltage peak-to-peak value to judge the resonance state. According to the device and the method provided by the invention, the resonant frequency can be detected, the tuning range can be adjusted as required, the tuning capacitance stepping precision can be adjusted as required, the tuning precision is high, and the resonant frequency adjustment efficiency is improved; meanwhile, the rapid tuning capacitor bridge is used as an independent adjusting unit, so that repeated welding and dewelding of the front-end circuit during the tuning process when the tuning capacitor is changed are effectively avoided, the safety and the reliability of the front-end bridge are ensured, and the engineering application requirements are better met.

The invention discloses a frequency measurement method, system and device and a computer readable storage medium, and belongs to the technical field of electricians. Acquiring a sampling value, and judging whether the sampling value is invalid or not based on the absolute value of the sampling value; determining a first frequency value based on the sampling value and the sampling frequency; determining an amplitude and a phase of a vector value of the signal based on the sampling value; determining a second frequency value according to the phase change; determining a frequency based on the first frequency value and the second frequency value; according to the frequency measurement method, system and device and the computer readable storage medium, a low-value locking technology, an extreme value anti-shake technology, a sampling zero crossing point anti-shake technology and a hysteresis frequency calculation technology are adopted, and sampling point frequency measurement and vector frequency measurement are organically combined, so that the frequency measurement precision when the signal frequency fluctuates in a large range under different working conditions is ensured; and the problem that the frequency measurement error is large when the signal frequency fluctuates in a large range is solved.

The invention discloses a method and system for measuring frequency characteristics of a capacitor voltage transformer, a terminal and a medium, and relates to the technical field of voltage transformers, and the method is characterized in that the transient voltage of a power system is used as the excitation voltage of the primary side of the CVT, and the response of the secondary side of the CVT to the transient voltage is collected to obtain the transient voltage response; performing spectral analysis on the transient voltage response, identifying a valley point and a peak point, and extracting a valley frequency corresponding to the valley point and a peak frequency corresponding to the peak point; and calculating stray parameters of the CVT according to the valley frequency and / or the peak frequency to obtain a frequency characteristic measurement result. According to the invention, on-line measurement of the frequency response characteristic of the CVT can be realized; excitation voltage does not need to be applied to the primary side of the CVT, the primary voltage of the CVT does not need to be measured, and no interference is introduced to equipment and a system.

The invention relates to the technical field of power grid limit alarm, and particularly discloses a power grid limit intelligent alarm method and system based on a risk assessment model. The multi-dimensional information of material aging, component loosening and component corrosion in the power equipment can be known more accurately, the performance influence value corresponding to each power equipment of each power node is analyzed, the equipment influence strength in the power grid can be known accurately, and the operation risk assessment degree of each power node in the power grid can be obtained through the risk assessment model. Complexity of the power grid limit and uncertainty of the risk are quantified and compared with an operation risk assessment threshold value, an accurate data comparison basis is provided for a power grid limit management system to execute intelligent limit alarm on each power node of the power grid finally, accuracy and response efficiency of power grid limit alarm can be improved, and reliability of the power grid limit alarm is improved. And safe and stable operation of a power system in a power grid is ensured.

A logarithmic detector based on frequency dynamic compensation of an input signal comprises a logarithmic amplifier for receiving a radio frequency signal, performing logarithmic conversion on the radio frequency signal and outputting a first current; the frequency discriminator determines first frequency information according to the radio frequency signal, and the first frequency information indicates a first frequency of the radio frequency signal; the temperature sensor is used for acquiring the real-time temperature of the environment where the logarithmic amplifier is located; the control module is used for generating a control signal based on the first frequency and the real-time temperature determined according to the first frequency information, the control signal is used for controlling the magnitude of second current, and the second current is used for compensating the first current at different first frequencies and different real-time temperatures; and the current compensation circuit receives the control signal and outputs a corresponding second current based on the control signal.

The invention discloses a detection method for a mobile phone shell and a related device. The method comprises the following steps: performing position and angle correction in a reference plane according to a geometric reference relationship between an annular magnetic component and the shell to obtain an attitude reference; carrying out magnetic flux density acquisition on the annular region under the attitude reference, and dividing a plurality of sectors to obtain magnetic flux density and polarity information of each sector; generating a predicted value of a wireless power transmission coupling parameter according to the magnetic flux density and polarity information of each sector in combination with the geometrical relationship of the annular region; acquiring an actual measurement value of a wireless power transmission coupling parameter under a preset signal condition; and performing difference calculation on the predicted value and the measured value, and weighting and distributing the difference to each sector according to the angular position according to the magnetic flux density and polarity information of the sector to obtain a sector-level defect positioning result. According to the scheme, the consistency of the magnetic domain and the electric domain of the mobile phone shell with the annular magnetic component can be checked without depending on a real machine, and hidden defects such as pole dislocation, magnetic shortage, assembly deviation or abnormal spacing can be effectively identified.

An integrated circuit may include frequency monitoring circuitry. The frequency monitoring circuitry may include a voltage-based frequency monitoring circuit for monitoring an input clock signal having an input clock frequency within a first set of frequencies and a coarse frequency monitoring circuit for monitoring an input clock signal having an input clock frequency within a second set of frequencies different from the first set of frequencies. The voltage-based frequency monitoring circuit may be configured to generate an output voltage having a first value when the input clock frequency is greater than a reference frequency and a second value when the input clock frequency is less than the reference frequency.The coarse frequency monitoring circuitry may include a reference counter and an input clock counter that generates a count value used to calculate the input clock frequency.

The control loop may not reach the optimal operating point because it settles into a local extremum instead of proceeding to global optimization. [Solution] The power transmitter 101 includes a driver 201 that generates a drive signal for an output resonant circuit, which has a transmitter coil 103 that generates a power transmission signal. A resonant detector 307 determines the coupled resonant frequency of the output resonant circuit, which is the resonant frequency of the output resonant circuit of the transmitter coil 103 coupled to a receiver coil 107, which is part of the power transmission input resonant circuit of the power receiver 105. The input resonant circuit has a quality factor of 10 or more. An estimation circuit 309 determines an estimated coupling coefficient for the coupling between the transmitter coil 103 and the receiver coil 107, depending on the uncoupled resonant frequency and the first effective resonant frequency of the output resonant circuit. An adapter 311 sets operating parameters according to the estimated coupling coefficient.

The invention relates to a power line characteristic current identification method and device and a phase line identification system. The method comprises the following steps: dividing a current signal and a current signal corresponding to a characteristic frequency based on a preset time window and a preset sliding step length to obtain a first time window array and a second time window array, a first identification sequence based on direct current signal identification and a second identification sequence based on characteristic frequency identification are obtained according to the characteristic sequence; and finally, a characteristic current signal can be judged by comparing the first identification sequence and the second identification sequence with the characteristic sequence. According to the embodiment of the invention, through two modes of direct current signal identification and characteristic frequency current signal identification at the same time, accurate identification in different noise or interference environments can be realized, and the accuracy and robustness of identification are significantly improved.

The utility model provides a voltage frequency monitoring alarm system. The system comprises a control module, and a monitoring input module, a buzzing alarm module, a light indication module and a power supply module which are connected with the control module, wherein the power supply module supplies power to the monitoring input module, the buzzing alarm module and the light indication module at the same time. According to the invention, the current transformer unit senses the frequency change of the voltage to be monitored, the photoelectric coupler unit is utilized to form the DC pulse voltage for the control module to carry out frequency monitoring, and the buzzing alarm module and the light indication module are further combined to realize the acousto-optic display of the frequency monitoring result. By using a simple system structure, rapid and effective output voltage frequency monitoring can be realized, the condition that the voltage frequency is unstable can be reflected in time, and the downstream equipment fault problem caused by voltage frequency fluctuation can be prevented.

The application provides a kind of high-frequency oscillation detection method based on band adaptive anti-noise power system, comprising: installing three-phase high-frequency voltage transformer at resonance sensitive point, selecting data acquisition window width, collecting three-phase voltage data and constructing three-phase voltage tensor mathematical model;Voltage tensor in three-phase voltage tensor mathematical model is decomposed to Tucker to realize voltage denoising;The voltage tensor after denoising is converted into three-phase voltage, and peak detection is carried out using dynamic measure;According to the detected high-frequency oscillation signal and its frequency range, wavelet packet decomposition is carried out on three-phase voltage, so that high-frequency oscillation signal and low-frequency fundamental wave and related harmonic components are separated to the wavelet coefficients of each frequency band;The wavelet coefficients containing oscillation signal are subjected to oscillation signal restoration;The restored oscillation signal is subjected to exponential decomposition using Prony method, and high-frequency oscillation characteristics are obtained.The application can improve the detection accuracy of high-frequency oscillation.

The application provides an online identification method for harmonic resonance of a power system, comprising the following steps: collecting voltage waveform data and current waveform data at a preset common coupling point in the power system, pre-processing to obtain waveform difference degree, performing multiple transformations on the collected voltage waveform data and current waveform data to obtain current complex matrix and voltage complex matrix of a fundamental wave and each harmonic; determining a fundamental wave and a total harmonic impedance amplitude array of the common coupling point according to an equivalent model of the power system; calculating power factors of the fundamental wave and each harmonic, and obtaining a power factor array after screening; and determining that harmonic resonance occurs in the power system when the waveform difference degree, the harmonic number array and the power factor array simultaneously satisfy a preset resonance condition. The application combines the similarity of the collected waveforms, harmonic impedance and power factors of multiple parameters, and only needs voltage and current waveform data at the PCC point to identify the harmonic resonance in the power system.

The present invention discloses a distributed power frequency detection method based on artificial neural network, which relates to the technical field of power frequency detection. The distributed power frequency detection method based on artificial neural network includes the following steps: using a sampling clock to synchronously collect voltage data of distributed power in each time period; using multi-channel voltage data as input of an artificial neural network model and extracting voltage signal characteristics; identifying the power frequency characteristics reflected by the voltage feedback waveform; training a power tracking model based on the power frequency characteristics using a multi-task learning framework, and then deploying the power tracking model on the distributed power supply to realize joint tracking of the distributed power supply; feeding back the joint tracking results to a control center to realize closed-loop control and predict the change characteristics of the power frequency. The present invention generates a voltage feedback waveform by extracting voltage signal characteristics, and detects the power frequency in real time by identifying the periodic performance of the voltage feedback waveform.

The application provides a non-invasive detection method and system for dynamic eccentricity fault of a brushless doubly-fed motor, and the method comprises the following steps: according to the basic electromagnetic relationship of the brushless doubly-fed motor, when the rotor dynamic eccentricity occurs, the fault characteristic frequency of the control winding connected with the frequency converter of the motor is calculated; the motor current is detected by using the FFT decomposition method, if the fault characteristic frequency signal appears, the current signal X(t) changing with time in the current transformer directly connected with the control winding in a certain time period of motor operation is recorded; the dynamic signal decomposition is performed on the current signal X(t), and the natural mode function of the current signal is obtained; the natural mode function of the current signal is fitted, and compared with the curve in the non-eccentric working state, if the fitted curve is offset compared with the curve in the non-eccentric working state, it is judged that the dynamic eccentricity fault occurs. The application detects the fault without adding additional sensors, and greatly improves the system reliability.

The present invention relates to the field of measurement technology, and in particular to a method for measuring power frequency voltage frequency. The method comprises: collecting a power frequency voltage signal, discretizing it, and converting it into a discretized power frequency voltage signal; using a multi-dimensional time-frequency joint adaptive filtering algorithm to adaptively filter the discretized power frequency voltage signal to obtain a power frequency voltage signal processed by the filter; performing phase synchronization processing on the power frequency voltage signal processed by the filter to obtain a filtered synchronized signal; processing the filtered synchronized signal using a zero crossing point detection algorithm based on wavelet transform and fuzzy logic algorithm, while introducing an error correction mechanism to calculate the final corrected period, thereby obtaining a frequency value. The method solves the technical problem of low accuracy and instability in power frequency voltage measurement in a complex power environment.

The present disclosure relates to a method (100) for monitoring radio frequency, RF, signals comprising the steps of obtaining (101) an RF signal, the RF signal having an input power. Further, the method comprises extracting (102) a pre-determined portion of said input power to obtain a decoupled RF signal and splitting (103) said decoupled RF signal into a first and a second RF signal. Furthermore, the method comprises altering (104) a frequency response of the second RF signal, determining (105) a power level of the first RF signal and the altered second RF signal and determining (106) a frequency of said RF signal based on a comparison of said power levels of said first RF signal and altered second RF signal.

To provide a semiconductor device that can maintain the accuracy of determining a failure of a sound reproduction device despite a change in temperature.SOLUTION: A semiconductor device comprises: a test signal generation circuit that modulates a test signal to generate a fifth modulated signal and a sixth modulated signal; a first amplifier circuit that outputs a third amplified signal and a fourth amplified signal obtained by amplifying the fifth modulated signal and the sixth modulated signal to a first output terminal and a second output terminal; a second amplifier circuit that outputs a seventh amplified signal and an eighth amplified signal obtained by amplifying the fifth modulated signal and the sixth modulated signal to a third output terminal and a fourth output terminal; a first peak frequency detection circuit that measures the electric potential difference between the first output terminal and the second output terminal and detects a first peak frequency; a second peak frequency detection circuit that measures the electric potential difference between the third output terminal and the fourth output terminal and detects a second peak frequency; and a determination circuit that determines whether the difference between the first peak frequency and the second peak frequency is included in a predetermined reference frequency difference range.SELECTED DRAWING: Figure 1

According to an embodiment of the invention, a system frequency detector is provided and includes an orthogonal coordinate signal generator generating an orthogonal two-phase voltage signal from a three-phase voltage signal of three-phase alternating current power of a power system by converting the three-phase voltage signal into a two-phase voltage signal orthogonal to the three-phase voltage signal, converting the two-phase voltage signal into a voltage signal of a rotating coordinate system, calculating a moving average of the voltage signal of the rotating coordinate system, and performing an inverse transformation of the voltage signal of the rotating coordinate system after calculating the moving average; and a frequency calculator including an angular frequency calculator calculating an angular frequency of the power system based on the two-phase voltage signal, and an arithmetic unit calculating a system frequency of the power system from the angular frequency, the frequency calculator further including a rate limiter provided in series with the arithmetic unit, the rate limiter limiting a change of the system frequency equal to or greater than a prescribed change rate. Thus, a system frequency detector is provided in which the change of the system frequency can be quickly tracked and an erroneous detection of the system frequency can be suppressed even when a system disturbance occurs.

Nuclear Magnetic Resonant Imaging (also called Magnetic Resonant Imaging or “MRI”) devices which are implantable, internal or insertable are provided. The disclosure describes ways to miniaturize, simplify, calibrate, cool, and increase the utility of MRI systems for structural investigative purposes, and for biological investigation and potential treatment. It teaches use of target objects of fixed size, shape and position for calibration and comparison to obtain accurate images. It further teaches cooling of objects under test by electrically conductive leads or electrically isolated leads; varying the magnetic field of the probe to move chemicals or ferrous metallic objects within the subject. The invention also teaches comparison of objects using review of the frequency components of a received signal rather than by a pictorial representation.