68results 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.

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.

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 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.

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 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 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 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.

The application relates to the technical field of electronic circuits, and discloses a current signal detection device. The current signal is preliminarily detected, a corresponding current conversion and amplification circuit is configured based on the intensity of the current signal obtained through the preliminary detection, a voltage signal corresponding to the strong and weak current signal is obtained through the current conversion and amplification circuit, and a fast Fourier transform is configured to realize the calculation and processing of the voltage signal to obtain a final current detection result.

The disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transmission rate than a 4th generation (4G) communication system, such as long term evolution (LTE). A circuit for detecting a reflection coefficient of an electronic device in a wireless communication system is provided. The circuit includes at least one processor, a plurality of analog to digital converters (ADCs), a plurality of RF elements, and a plurality of transmission lines including a first transmission line, a second transmission line, and a third transmission line, wherein the plurality of ADCs, the plurality of RF elements, and the plurality of transmission lines are correspondingly connected to each other, respectively, the plurality of ADCs are connected to the at least one processor.

The present application relates to the technical field of electronic circuit, especially to a differential transformer resonant bridge resonant frequency detection and adjustment device and method, a fast tuning capacitor bridge is composed of multiple tuning capacitors, by adjusting the capacitance value of the tuning capacitor in the access circuit, the change of the resonant frequency is completed; in addition, the voltage data is collected by using an analog-to-digital conversion circuit, and the minimum value of the output voltage peak-to-peak value is directly observed by the host computer to judge the resonant state. The device and method provided by the present application can detect the resonant frequency, and adjust the tuning range according to the demand, the tuning capacitor step precision can be adjusted according to the demand, the tuning precision is high, the efficiency of adjusting the resonant frequency is improved; at the same time, the fast tuning capacitor bridge is a separate adjustment unit, which effectively avoids the repeated welding and unwelding of the front-end circuit when changing the tuning capacitor during the tuning process, ensures the safety and reliability of the front-end bridge, and better meets the engineering application requirements.

An apparatus (100), the apparatus comprising: a switched capacitor (110) configured to generate a switched capacitor voltage (Vcap) based on an input clock signal (fin) and a current (Idac); a current digital-to-analog converter (DAC) (105) configured to generate a current based on the first digital signal (Din); a first reference voltage generator (115) configured to generate a first reference voltage (Vref); and a first voltage comparison device (120) configured to generate a first frequency deviation detection signal (Dcm) based on a comparison of the switched capacitor voltage with a first reference voltage.

An apparatus (100), including: a switched capacitor (110) configured to generate a switched capacitor voltage (Vcap) based on an input clock signal (fin) and a current (Idac); a current digital-to-analog converter, DAC, (105) configured to generate the current based on a first digital signal (Din); a first reference voltage generator (115) configured to generate a first reference voltage (Vref); and a first voltage comparing device (120) configured to generate a first frequency deviation detection signal (Dcm) based on a comparison of the switched capacitor voltage to the first reference voltage.

A device including a first switching converter configured to generate a negative supply voltage based on an input voltage; a load current sensor configured to sense a magnitude of a load current passing through a load to which the negative supply voltage is provided; and a first input current detector configured to detect a magnitude of a first input current provided to the first switching converter based on a duty cycle of the first switching converter and the magnitude of the load current.

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 present invention relates to a fault signal detection system of target equipment using a resonance filter, which can precisely detect a fault signal of a coil in the target equipment regardless of frequency resolution, and can greatly improve a signal-to-noise ratio. To this end, provided is a detection device which detects a fault signal that may occur in a target coil (30) of the target equipment, comprising: a tuning capacitor (150) which is connected in series between a coil power source (120) and a coil inductor (160) with respect to a coil power source (120), the coil inductor (160), and a coil resistor (180) of the target coil (30), and is capable of tuning a frequency of the resonance filter; and a matching capacitor (140) which is connected to the coil power source (120) in parallel and can be matched with the frequency of the resonance filter, and thereby, a signal-to-noise ratio (SNR) may be further increased when the fault signal in the frequency domain passes through the resonance filter.

This invention discloses a broadband oscillation assessment method, apparatus, and device. By applying harmonic voltage and current sources, it calculates the node harmonic response values ​​at different harmonic orders, plots node harmonic response curves based on these values, and determines whether a node has a resonance risk based on the curves. This method does not rely on the accuracy of system modeling and does not require system disconnection or shutdown. Compared to pre-assessment methods, it is more accurate and more flexible than on-site protection assessment methods, solving the technical problems of poor accuracy and flexibility in existing broadband oscillation assessment methods.

The invention relates to a method for determining a resonance frequency (4) of a quantum system (6) in a frequency range (8), wherein in a first method step (34) the frequency range (8) is divided into a number of frequency bins (36, 36a... 36h), wherein in a second method step (42) for each frequency bin (36, 36a...36h): a measurement frequency (14) is generated, the measurement frequency (14) is expanded by signal processing to a frequency group (18) covering the frequency bin (36, 36a...36h), the quantum system (6) of the frequency group (18) is manipulated, and a resulting measurement signal (26) is acquired, and the measurement signal (26) is compared with a stored threshold value, wherein in a third method step (52) a resonance frequency (4) is determined on the basis of those measurement signals (26) which have reached or exceeded the threshold value.

An insulation resistance tester includes test cables structured to be coupled to insulation and to a conductor of the DUT, a port coupled to the set of testing cables, a resistance measurement unit coupled to the port and structured to determine an insulation resistance of the DUT, a fault detector coupled to the port and structured to generate a fault-detecting signal to be applied to the DUT to provoke a response, a fault pre-locater structured to receive a return signal from the DUT after being provoked by the fault-detecting signal, and structured to determine a potential location of a fault in the DUT based at least in part on the return signal, and a display structured to show an indication of a location of the fault in the DUT in relation to a location of the insulation resistance tester. Methods are also described.

The invention relates to the technical field of signal processing, in particular to an accurate frequency estimation method combining an amplitude ratio method and an interpolation method, which comprises the following steps of: generating a pulse single-frequency signal with zero filling, and setting a signal frequency value, a pulse width and a total signal length; performing M-point FFT calculation on the received signal to obtain a maximum spectral level position and an adjacent spectral line coefficient, and intercepting a noise segment to estimate noise power; performing coarse frequency estimation through a corrected amplitude ratio method; performing accurate estimation based on a zero-filling improved fractional Fourier coefficient interpolation method; and outputting a final accurate frequency estimation result. According to the method, the problems that the requirement of a fractional Fourier coefficient interpolation method for coarse estimation is high and estimation is inaccurate under the condition that the initial error of a signal frequency domain is large are solved, meanwhile, the problem that an amplitude ratio method does not consider noise power is corrected, and compared with a traditional amplitude ratio method, the accuracy is greatly improved.

The present application relates to a kind of methods for measuring the amplitude-frequency and phase-frequency response of radio frequency cavity, comprising: the digital radio frequency low level system generates sawtooth wave pulse frequency signal, and generates frequency control word;The digital radio frequency low level system generates sine data sequence and cosine data sequence according to the frequency control word, and the sine data sequence and the cosine data sequence are quadrature modulated, the output of the quadrature modulation is converted to digital-analog after output to the power source, and then the power amplifier is carried out power amplification and the directional coupler coupling after generation radio frequency signal input to the radio frequency cavity;The digital radio frequency low level system obtains the cavity pressure signal of the radio frequency cavity, and the forward voltage signal and reverse voltage signal of the directional coupler;The digital radio frequency low level system carries out real-time signal processing according to the cavity pressure signal, the forward voltage signal and the reverse voltage signal, and obtains the amplitude-frequency and phase-frequency response curve of the radio frequency cavity.