47results 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 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 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 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.

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 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.

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 belongs to the field of electric energy meter metering, and discloses a power grid frequency change reactive error compensation method, system and device and a medium, and the method comprises the steps: obtaining frequency values sampled by a metering chip, splitting the frequency values based on a central point, and obtaining the central point frequency of each frequency value; inputting the central point frequency of each frequency value extracted from the sample table and a pre-configured output frequency into an initial fundamental reactive phase correction register together for processing to obtain a register value of the central point frequency; and inputting the frequency values, the central point frequencies of the frequency values and the register values of the central point frequencies into a fundamental wave reactive phase correction register for calculation to obtain a meter calibration parameter checksum, and storing the meter calibration parameter checksum to realize dynamic reactive error compensation. According to the method, the phase correction register is dynamically corrected through a statistical method in combination with a software algorithm, the reactive error of the reactive primary table can be kept within an ideal range within a power grid frequency range, and the energy metering accuracy is improved.

A spin-orbit torque (SOT) measuring apparatus includes a photoelastic modulator (PEM) configured to periodically modulate a polarization direction of linearly polarized incident light and emit a periodically modulated light, a first polarization rotator configured to rotate a polarization direction of the periodically modulated light, a voltage generator configured to generate an AC current to a sample to which light with the rotated polarization direction is to be emitted, a prism configured to split light reflected into first light and second light having different polarization directions, a balanced detector configured to output a signal corresponding to an intensity difference between the first light and the second light, a changing circuit configured to change a frequency component to the intensity difference, and an amplitude measurer configured to measure an amplitude of a frequency component corresponding to a modulation frequency of the PEM with the changed frequency component.

The application discloses an intelligent photoelectric transformer and a use method thereof, and belongs to the technical field of transformers. The transformer comprises a photoelectric acquisition unit, a signal conditioning and analog-digital conversion module, a data processing and core control module, a multi-protocol data communication module and a power management module, the photoelectric acquisition unit is connected with the signal conditioning and analog-digital conversion module, the signal conditioning and analog-digital conversion module is connected with the data processing and core control module, and the data processing and core control module is connected with the multi-protocol data communication module. The application deeply integrates photoelectric sensing, variable step adaptive filtering and multi-scale time domain convolution network, realizes high-precision electric energy metering, multi-dimensional electric energy quality analysis and load trend prediction, supports double-protocol communication, has strong real-time processing capability and high compatibility, upgrades a traditional sensor into a sensing terminal with edge intelligence, is a core equipment supporting digital transformation of a smart power grid, and is convenient to use.

The present disclosure relates to an energy storage system including a rack formed of battery cells and a bank, and an apparatus and method for measuring impedance of the energy storage system. The energy storage system including racks each including a plurality of battery cells connected in series, a bank formed by connecting the racks in parallel, and an impedance meter configured to measure impedance of the bank or the racks. The impedance meter is configured to perform impedance measurement of the bank including all of the racks or each of the racks individually.

The application discloses a kind of power transformation equipment thermal defect monitoring methods, it is related to the technical field of fault detection, including the following steps, setting quantitative parameter, test obtains the dielectric loss factor information of equipment element, first PFM amplitude offset and second PFM amplitude offset are calculated, weighted calculation obtains integrated PFM amplitude offset, setting PFM amplitude offset threshold, the thermal defect of equipment element is classified, obtains equipment element thermal defect grade.The application can comprehensively evaluate the state of equipment element by combining temperature, dielectric loss factor and PFM amplitude, identify potential thermal defects, use mean square deviation as quantitative parameter, can more accurately monitor temperature fluctuation, optimize the operating conditions of equipment and improve monitoring accuracy by amplitude control of PFM signal, the collection of environmental information and the matching of difference value improve detection efficiency and accuracy, by thermal defect classification, it is convenient to take maintenance measures in time early warning, improve the operating reliability and safety of equipment.

A circuit for an inductive conductivity sensor comprises: a secondary coil having a first coil terminal and a second coil terminal, a switch having a first switch terminal, a second switch terminal, a third switch terminal, a first potential terminal, and a control unit having a first control terminal and a second control terminal, wherein the first coil terminal is connected to the first control terminal and the second coil terminal is connected to the first switch terminal, wherein the second switch terminal is connected to the first potential terminal and the third switch terminal is connected to the second control terminal.

The invention relates to an apparatus having a six-port circuit, a delay device and a computing device, wherein: the delay device is designed to split an input signal into a first input signal and a second input signal, to delay the first input signal by a first delay time so as to obtain, for example, a first delayed output signal, and to delay the second input signal by a second delay time so as to obtain, for example, a second delayed input signal, the second delay time being different from the first delay time; the delay device is designed to output the first delayed input signal to a first input of the six-port circuit and to output the second delayed input signal to a second input of the six-port circuit; and the computing device is designed to determine, on the basis of at least one output signal of the six-port circuit, a first variable characterising a frequency of the input signal.

The invention discloses a self-adaptive dynamic electric energy metering method, device and equipment and a storage medium, and belongs to the technical field of electric energy metering, and the method comprises the steps: carrying out the non-stationary signal feature classification of an input electric energy signal through a pre-constructed electric energy non-stationary signal feature filter; according to a non-stationary signal feature classification result, an electric energy metering algorithm is adaptively matched; and performing electric energy metering by using an adaptive matching electric energy metering algorithm to obtain an electric energy metering result and outputting the electric energy metering result. According to the method, the strategy of first identification and second matching is adopted, it is ensured that when multiple types of non-stationary disturbance occur in the power grid, the current optimal algorithm can be called for electric energy metering, and therefore the metering precision and the dynamic response capacity in the complex power grid environment are improved, and the problem that the prior art cannot adapt to variable working conditions is solved.