52results about "Frequency to phase shift conversion" patented technology

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.

A micro controller unit including: a memory configured to store first data and second data, the first data being represented in a floating point form, and the second data being obtained by sampling a signal, and processing circuitry configured to generate (1_1)-th data by right-shifting the first data by a first bit, generate a difference between the first data and the (1_1)-th data to obtain (1_2)-th data, and perform 1-point discrete Fourier transform on the (1_1)-th data, the (1_2)-th data, and the second data based on a first function.

An abnormality diagnosing device (30) detects a current flowing through a motor (2) driven by a pulse width modulation control of a power conversion device (100) and performs frequency analysis, and a determination section (34) determines an abnormality of the motor (2) based on a spectrum peak value of at least one sideband component of a modulation wave obtained from the analysis result. The abnormality diagnosing device (30) includes a frequency setting section (33) that sets a noise frequency (fnα) in the current in advance, and the determination section (34) estimates whether or not there is noise interference in the spectrum peak value of the sideband component based on a frequency of the sideband component and the set noise frequency (fnα), thereby performing abnormality determination.

A leakage detection device that applies a leakage detection method, is applied to a vehicle, and includes a detection unit, a sampling unit, and a signal processing unit. The detection unit is separately connected to two-phase discharge paths of a power supply and is used to separately establish detection loops of the two-phase discharge paths when the power supply discharges. The sampling unit is electrically connected to the detection unit and is used to collect a first detection voltage of a first-phase discharge path and / or a second detection voltage of a second-phase discharge path from the detection loop. The signal processing unit is connected to the sampling unit, asynchronously receives the first detection voltage and the second detection voltage from the sampling unit, and is used to determine the leakage characteristics of the power supply according to the first detection voltage and the second detection voltage.

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 low-pass filter provided in series with the arithmetic unit, the low-pass filter suppressing a high frequency component of the system frequency. 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.

According to one embodiment, a control device includes: a control circuitry configured to control an electric motor; and a failure sensing circuitry configured to sense a failure of the electric motor, wherein the failure sensing circuitry executes frequency analysis concerning an electric signal for driving the electric motor, calculates a phase of the electric signal, calculates a phase difference between a phase of a fundamental wave of a power supply frequency of the electric signal and the calculated phase of the electric signal, extracts a first signal indicating an outflow component from the electric motor based on a calculation result of the phase difference, extracts a second signal indicating an inflow component to the electric motor based on the calculation result of the phase difference, and senses the failure based on the first signal.

The present invention relates to a magnetic field gradient (B a -B b The present invention relates to a magnetic field gradiometer (1) for determining the magnetic field gradiometer (1), comprising at least one excitation light source (5a, 5b) for emitting excitation light (6a, 6b), two spatially spaced measurement areas (3a, 3b) for measuring the magnetic field, each having color centers in diamond, preferably NV centers (4a, 4b) that emit fluorescent light (7a, 7b) when excited by the excitation light (6a, 6b), and a first detector (3a) for detecting the fluorescent light (7a) from the first measurement area (3a). (8a), a second detector (8b) for detecting fluorescent light (7b) from the second measurement area (3b), a first microwave radiator (10a) for applying a first microwave field (9a) to the first measurement area (3a), a second microwave radiator (10b) for applying a second microwave field (9b) to the second measurement area (3b), and a magnetic field gradient (B) based on the fluorescent light (7a) detected from the first measurement area (3a) and the fluorescent light (7b) detected from the second measurement area (3b). a -B b The magnetic field gradiometer (1) comprises an evaluation device (11) configured to determine a first microwave signal (f MW1 (t)) for the second microwave radiating portion (10b), and a second microwave signal (f MW2 (t)) and a signal generator (12) configured to generate a

A semiconductor device according to some example embodiments comprises: a reference die configured to generate a test signal based on a first seed and transmit both an output clock signal and the test signal, and a target die configured to receive the output clock signal as an input clock signal though at least one through-silicon via TSV, capture the test signal as captured data based on the input clock signal, and compare a comparison pattern generated based on the first seed and the captured data.

Aspects of the present disclosure involve charging or discharging an electrochemical device such as a battery. The system generates a waveform, such as a charge signal, to tune harmonic attributes of the waveform based on the impedance of the battery to a harmonic or harmonics of the waveform. The system may enhance (e.g., add or increase magnitude) or suppress (e.g., delete or reduce magnitude) harmonics of the waveform. Such a harmonically tuned waveform may optimize energy transfer to or from the battery to achieve various possible goals including charging speed, enhancing battery charge capacity and / or enhancing battery cycle life.

The present disclosure relates to techniques for measuring slew rate in a current integrating phase interpolator. An apparatus is described that includes a current integrating phase interpolator core having a programmable bias current; an inverter circuit coupled to an output of the current integrating phase interpolator core for receiving a signal containing a periodic sawtooth waveform therefrom; a digital-to-analog (D / A) converter for setting an input common mode voltage of the inverter circuit; a duty cycle measurement (DCM) circuit for measuring a duty cycle distortion (DCD) of a clock signal output from the inverter circuit; and a circuit for calculating a difference between a first state of the DCD of the clock signal corresponding to the inverter circuit being set to a high voltage input common mode voltage and a second state of the DCD of the clock signal corresponding to the inverter circuit being set to a low voltage input common mode voltage.

The present invention relates to a high-frequency driven high-speed diagnostic electrostatic probe system and a method thereof and, more specifically, provides a high-frequency driven high-speed diagnostic electrostatic probe system and a method thereof, wherein a high-speed diagnosis for the characteristics of plasma is enabled by using a fitting function without a high impedance choke filter after a plurality of pieces of current waveform data, which are measured by applying a high-frequency bias voltage to a probe while shifting the phase of same, are phase-retrieved and averaged and then processed in accordance with a preset methodology.

A partial discharge measurement system is disclosed. The present system comprises: a reference signal generation apparatus that is located in a real space and outputs a reference signal for phase correction; and an acoustic camera that measures partial discharge on the basis of a partial discharge acoustic signal generated from a target to be measured. The acoustic camera includes: an acoustic signal reception unit that receives the partial discharge acoustic signal generated from the target being measured; and a data processing unit that generates partial discharge acoustic data for the partial discharge acoustic signal and phase-corrects the partial discharge acoustic data on the basis of a phase difference between the reference signal and the partial discharge acoustic signal, so as to generate phase-corrected partial discharge acoustic data.

A frequency detection apparatus (7) comprises a data downsampling unit (10) that extracts, as first downsampled data, pieces of data every m samples from a sequence of quantized data samples of a measured signal, and extracts, as second downsampled data, pieces of data which are offset by an offset number with respect to the respective pieces of data extracted every m samples, and a phase difference calculation unit (12) that calculates a phase difference between the phases of the first downsampled data and the phases of the second downsampled data. The frequency detection apparatus (7) also comprises a phase difference calibration unit (13) that acquires calibrated data which corresponds to the phase difference calculated by the phase difference calculation unit (12) and calibrates the phase difference according to the calibrated data, an aliasing order calculation unit (14) that calculates a Nyquist aliasing order of the first downsampled data on the basis of the calibrated phase difference from the phase difference calibration unit (13), and a frequency calculation unit (15) that calculates the frequency of the measured signal using a frequency calculated by a frequency phase calculation unit (11) and the Nyquist aliasing order calculated by the aliasing order calculation unit (14).

To realize a stable operation of an electrical device.SOLUTION: A control device according to an embodiment includes a failure detection unit configured to detect a failure. The failure detection unit is configured to perform frequency analysis on an electrical signal for driving an electric motor, calculate a phase of the electrical signal, calculate a phase difference between a phase of a fundamental wave of a power supply frequency of the electrical signal and the calculated phase of the electrical signal, extract a first signal indicating an outflow component from the electric motor based on a calculation result of the phase difference, extract a second signal indicating an inflow component to the electric motor based on the calculation result of the phase difference, and detect the failure based on the first signal.SELECTED DRAWING: Figure 2

The present invention discloses a frequency tracking method for a magnetically coupled wireless power transmission system. The method uses an intersecting S transform to detect the phase difference between the primary current and voltage. First, the voltage signals and the voltage signals obtained by the primary current and voltage detection are respectively passed through a low-pass filter to obtain two sinusoidal signals. this Two discrete signals are sampled from the two channels, and then an intersecting S-transform is performed on the two discrete signals. The phase difference between the primary current and voltage is determined by extracting the transformation result. Finally, the operating frequency of the inverter switch is adjusted based on the phase difference to achieve the resonant frequency of the system, thus achieving frequency tracking. This invention can quickly and accurately achieve frequency tracking, providing conditions for the magnetically coupled wireless power transmission system to operate in a resonant state.

Provided is a measured waveform phase control device and method of a merging unit (MU) which obtains an accurate value at a sampling command time, corrects characteristics of a change in temperature of an oscillator element, and also corrects delay characteristics of an analog sensing element at the sampling command time. A measured waveform phase control device of an MU of the present invention includes a temperature sensor which provides ambient temperature information, an oscillator element which provides an oscillation signal, an analog-digital converter (ADC) which samples an analog current sensing signal or voltage sensing signal as a digital signal, and a sampling clock providing part which provides a sampling clock to the ADC on the basis of the ambient temperature information and the oscillation signal under control of a sampling request part.

This quantum sensor system comprises: a magnetic sensor module disposed spaced apart from a magnetic device to measure a magnetic field from the magnetic device and having a second temperature sensor; and a main circuit operably coupled to the magnetic sensor module and having a first temperature sensor. The main circuit is configured to measure the magnetic field in a specific frequency band on the basis of the temperature value difference between a first temperature value measured by the first temperature sensor and a second temperature value measured by the second temperature sensor.

Apparatus and methods for phase tracking an oscillatory signal are provided. In one arrangement, an input signal is received. First and second reference oscillatory signals are received at the frequency of a target frequency component of the input signal. The first and second reference oscillatory signals are phase shifted relative to each other. Weights of a weighted sum of the first and second reference oscillatory signals are iteratively varied to match the weighted sum to the input signal. The weights of the matched weighted sum are used to provide real time estimates of the phase of the target frequency component of the input signal.

Aspects of the present disclosure involve charging or discharging an electrochemical device such as a battery. The system generates a waveform, such as a charge signal, to tune harmonic attributes of the waveform based on the impedance of the battery to a harmonic or harmonics of the waveform. The system may enhance (e.g., add or increase magnitude) or suppress (e.g., delete or reduce magnitude) harmonics of the waveform. Such a harmonically tuned waveform may optimize energy transfer to or from the battery to achieve various possible goals including charging speed, enhancing battery charge capacity and / or enhancing battery cycle life.

This invention relates to the field of electrical parameter measurement and analysis technology, and particularly to a method, system, and medium for measuring the initial phase of amplitude-frequency oscillations in AC power systems. The method includes: acquiring three-phase voltage sampling signals; constructing a mathematical model of the oscillation signal based on the sampling signals; performing coordinate transformation on the sampling signals to obtain direct-axis and quadrature-axis components; constructing an amplitude oscillation signal based on the direct-axis and quadrature-axis components and separating the amplitude modulation component; performing analytical expansion of the frequency modulation term based on the mathematical model of the oscillation signal to obtain an analytical expression for the frequency oscillation; performing frequency domain transformation on the time-domain signals corresponding to the amplitude oscillation signal and the analytical expression for the frequency oscillation, respectively; determining the initial phase of the amplitude modulation based on the phase information of the disturbance frequency component; and calculating the initial phase of the frequency modulation based on the phase relationship between the subsynchronous or supersynchronous component and the power frequency component. This invention effectively solves the problem of accurately measuring the initial phase of oscillations when amplitude-frequency oscillations occur at the grid connection point.

This invention provides a method and system for simultaneous measurement of Doppler frequency shift (DFS) and angle of arrival (AOA) based on a dual-polarization-dual-electrode Mach-Zehnder modulator (Dpol-DDMZM). The Dpol-DDMZM modulates the echo signals and local oscillator signals received from two antennas in parallel onto an optical wave in OCS mode. After a 90° polarization rotation and orthogonal polarization combining, the resulting polarization-multiplexed optical wave carries the echo and local oscillator signals. These signals are then filtered out by an optical bandpass filter (OBPF) to remove the positive first-order sidebands, and demultiplexed into two optical signals by a polarization beamsplitter (PBS). These signals are then converted into photoelectric signals and differentially processed by a balanced detector (BPD). The output photocurrent contains information on the Doppler frequency shift (DFS) and angle of arrival (AOA). This scheme utilizes photocurrent phase-AOA mapping to achieve simultaneous measurement of DFS and AOA. Furthermore, the modulator operates in OCS mode, improving the measurement accuracy of DFS and AOA. The system has a simple structure and high stability.

The invention provides an instantaneous frequency measurement system and method based on a phase modulator, and the system is connected with a vector network analyzer, and comprises a light source module which is used for providing an optical carrier; the modulation module is used for modulating the fed radio frequency microwave signal onto an optical carrier to obtain an optical modulation signal; the wavelength division multiplexing module is used for separating positive and negative first-order sidebands of the optical modulation signal into a first optical modulation signal and a second optical modulation signal; the detection module is used for respectively converting the first light modulation signal and the second light modulation signal into a first electric signal and a second electric signal; the coupling module is used for combining the first electric signal and the second electric signal to form an output electric signal; wherein the vector network analyzer is respectively connected with the modulation module and the coupling module, and the vector network analyzer receives the output electric signal, obtains a power spectrum of the output electric signal and reversely deduces instantaneous frequency information of the radio frequency microwave signal. The system is high in integration level and strong in anti-electromagnetic interference capability, and is suitable for various scenes.

A test and measurement instrument to receive a signal from a device under test, one or more analog-to-digital converters to receive the signal and convert the signal to digital samples, a moving max filter to receive the digital samples and produce a max value waveform from the digital samples within an envelope width to trigger operation of the test and measurement instrument, and one or more buffers to store max values from the digital samples. A moving max filter includes a max build-up circuit connected to one or more buffers to produce a building up max value, a max build-down circuit connected to the one or more buffers to determine which stored max values can be cleared from the one or more buffers and produce a building down max value, and a comparison block to find a maximum between the building up max value and the building down max value and to output the maximum.

The present invention relates to the field of signal processing technology, and in particular to a single-frequency pulse signal detection method, comprising receiving a signal; segmenting the received signal according to the pulse width, and detecting each segment of the signal x i The length of the signal is N; Fourier transform is performed on each segment of data; the discrete Fourier transform of the rectangular window signal with a length of N equal to the pulse width is calculated; deconvolution is then performed to obtain the signal spectrum; a detection threshold is set, the signal spectrum is detected, and the peak of the signal spectrum is found. When the peak is greater than the detection threshold, it is considered that a single-frequency pulse signal has been detected. The present invention uses a deconvolution method to deconvolve the signal spectrum, enhance the peak of the single-frequency pulse signal spectrum, eliminate frequency ambiguity and sidelobe leakage, and improve the subsequent detection probability.

The present invention relates to a measured waveform phase control device and method of a merging unit (MU) which obtains an accurate value at a sampling command time, corrects characteristics of a change in temperature of an oscillator element, and also corrects delay characteristics of an analog sensing element at the sampling command time. A measured waveform phase control device of an MU of the present invention includes a temperature sensor which provides ambient temperature information, an oscillator element which provides an oscillation signal, an analog-digital converter (ADC) which samples an analog current sensing signal or voltage sensing signal as a digital signal, and a sampling clock providing part which provides a sampling clock to the ADC on the basis of the ambient temperature information and the oscillation signal under control of a sampling request part.

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.

In certain aspects, an apparatus includes a power detector coupled between a power amplifier and an antenna and a voltage detector coupled between the power amplifier and the antenna. The apparatus also includes a phase shifter coupled to the power detector and a load measurement circuit coupled to the power detector, the voltage detector, and the phase shifter.

The embodiment of the invention provides a power grid voltage phase detection method and device, equipment and a medium. The method comprises the steps that a second-order generalized integrator carries out low-pass filtering on a power grid voltage signal, harmonic and direct-current components in the power grid voltage signal are suppressed and filtered for the first time, and direct-current bias and phase bias in the power grid voltage signal are filtered in combination with bias filtering, so that current interference is avoided to the maximum extent; and through transformation processing and a linear expansion state observer, an instantaneous angular frequency corresponding to the current is obtained, and a phase value corresponding to the power grid voltage signal is calculated. The method is used for solving the problem of insufficient accuracy of power grid voltage phase detection in related technologies.

An apparatus and method for managing a battery includes a charger charging a battery including two or more battery cells connected in series, and a processor configured to control the charger to charge the battery at a first constant current in response to a quick charge request to the battery, and to control the charger to charge the battery at a second constant current in response to a quick charge request to the battery. When quick charging is performed, one of the voltages of the battery cells is monitored, and a charging characteristic of the battery is controlled according to an interval to which the cell voltage belongs in a dQ / dV curve.