26results about "Modulation depth measurements" patented technology

Measuring MDEVM of a DUT includes splitting an RF signal output by a DUT into first and second RF signals; acquiring and digitizing the first and second RF signals in first and second channels without demodulating the first and second RF signals; performing equalization of the first and second RF signals; measuring first and second modulation distortion (MD) error vectors of the equalized first and second RF signals; performing cross-correlation of the first and second MD error vectors across the first and second channels; averaging the cross-correlated MD error vectors over symbols and packets of the RF signal; and dividing the averaged cross-correlated MD error vectors by signal power of an ideal signal to obtain cross-correlated MDEVMs over a time period or bandwidth of a waveform of the RF signal, where performing the cross-correlation suppresses contribution of uncorrelated noise.

An apparatus for detecting disconnection of a power cable of a motor may include a computing device including a processor and a storage medium on which one or more programs configured to be executable by the processor are recorded, wherein the one or more programs may include: obtaining a plurality of sensing current values from a plurality of current sensors respectively sensing currents flowing in a plurality of windings of the motor corresponding to a plurality of phases of the motor; determining a plurality of correction current values by removing a common mode current from each of the sensing current values; and detecting disconnection in each of the phases based on a cable disconnection index based on the plurality of correction current values.

Disclosed is a test device to test the operation of an MMC by fabricating only one or several SMs constituting the MMC testing under real-time operating conditions. The test device for a modular multi-level converter (MMC) includes a simulation model of an MMC having at least one arm to which sub modules (SMs) are serially connected, at least one test target SM among the serially connected SMs being replaced with a dependent voltage source; an arm current simulation circuit including an equivalent SM that implements the test target SM as actual physical hardware and an inverter that supplies current to the equivalent SM; and a control unit configured to control the arm current simulation circuit to correspond to an operation of the simulation model and set a voltage corresponding to a charge / discharge voltage of the equivalent SM of the arm current simulation circuit to the dependent voltage source.

The invention relates to the technical field of optical modulators, in particular to a method for testing half-wave voltage and modulation efficiency of a Mach-Zehnder modulator, and the method comprises the steps: controlling the input optical power of a slave beam splitter to be a fixed value, and adjusting the output optical power of the Mach-Zehnder modulator to be half of the maximum value of the output optical power; voltage values # imgabs0 # and # imgabs1 # are applied to the upper modulation arm and the lower modulation arm respectively; linearly fitting the relation between the electro-optical phase shift # imgabs2 # and the voltage value # imgabs3 # generated by the upper modulation arm and the relation between the electro-optical phase shift # imgabs4 # and the voltage value # imgabs5 # generated by the lower modulation arm to obtain a fitting coefficient; calculating a half-wave voltage # imgabs6 # of an upper modulation arm and a half-wave voltage # imgabs7 # of a lower modulation arm based on the fitting coefficient; and calculating the half-wave voltage # imgabs8 # of the Mach-Zehnder modulator. According to the invention, the half-wave voltage and modulation efficiency of the Mach-Zehnder modulator can be conveniently tested.

Measuring an MDEVM of a DUT (101) comprises splitting an RF signal output by a DUT into a first and a second RF signal (S611); acquiring and digitizing the first and second RF signals in a first and a second channel without demodulating the first and second RF signals (S612); performing equalization of the first and second RF signals (S613); measuring first and a second modular distortion (MD) error vectors of the equalized first and second RF signals (S615); performing cross-correlation of the first and second MD error vectors over first and second channels (S616); and averaging the cross-correlated MD error vectors over symbols and packets of the RF signal (S617).and dividing the averaged cross-correlated MD error vectors by the signal power of an ideal signal to obtain cross-correlated MDEVMs over a period or bandwidth of a waveform of the RF signal (S618), wherein performing the cross-correlation eliminates the contribution of uncorrelated noise.;

A highly accurate feature extraction is performed on a signal with temporal variation in amplitude, and this signal is restored to detect a state of a transmission source (output source) of this signal to be normal or abnormal. A signal processing method includes: separating a signal X into an oscillation signal with a constant amplitude X1 and a signal with temporal variation in amplitude X2, the separating performed by a signal separator; performing processing of dimensionality reduction, compression, or the like, on the oscillation signal X1 so as to extract a feature value (information) included in the oscillation signal X1; and outputting a restored signal X1′ that is restored from the oscillation signal X1 by performing processing inverse to the processing of dimensionality reduction, compression, or the like, based on the extracted feature value, performing the processing, the inverse processing, and the outputting performed by a signal X1 restorer.

The invention relates to a device for detecting disconnection of a power cable of a motor, a motor system and a vehicle. The apparatus for detecting disconnection of a power cable of an electric machine may include: a computing device including a processor and a storage medium on which one or more programs configured to be executed by the processor are recorded; wherein the one or more programs may include: obtaining a plurality of sensed current values from a plurality of current sensors respectively sensing currents flowing in a plurality of windings of the motor corresponding to a plurality of phases of the motor; determining a plurality of corrected current values by removing a common mode current from each of the plurality of sensed current values; a disconnection of each of the plurality of phases is detected based on a cable disconnection index according to the plurality of corrected current values.

The present invention relates to a method for probing a circuit breaker electrically connected to an electric line. The probing method comprises the following steps: - injecting (101) a first signal (S1(t)) at a first point (A) of said electric line, wherein said first signal has a predefined frequency content and a predefined frequency band and is injected during an injection time interval (TJ) having a predefined time duration; - detecting (102) a second signal (S2(t)) at a second point (B) of said electric line, wherein said second signal is detected during a detection time interval (TD) including at least partially said injection time interval (TJ); - processing (103) a first portion of said second signal (S2(t)), which refers to a first portion (TJ) of said detection time interval (TD), during which said first signal (S1(t)) is injected, to calculate a first signal value (GJR) indicative of the signal power of said second signal (S2(t)) in the frequency band of said first signal S1(t), during the first portion (TJ) of said detection time interval (TD); - processing (104) a second portion of said second signal (S2(t)), which refers to a second portion (TN) of said detection time interval (TD), during which said first signal (S1(t)) is not injected, to calculate a second signal value (GN) indicative of the signal power of said second signal (S2(t)) in the frequency band of said first signal S1(t), during the second portion (TN) of said detection time interval (TD).

The utility model discloses a portable potential detection device for a steel structure of an ocean platform. Comprising a cable reel, the center of the cable reel is provided with a driving reel, a detection signal cable is wound on the driving reel, and the starting end of the detection signal cable is fixedly connected with the driving reel; the driver is arranged on the outer side of the cable reel and connected with the driving reel; the signal sensor is arranged at the tail end of the detection signal cable and is electrically connected with the detection signal cable; the intelligent controller is arranged on the outer side of the cable reel and located above the driver; one end of the loop signal cable is electrically connected with the intelligent controller, and the other end of the loop signal cable is connected with the ocean platform steel structure. The ocean platform steel structure potential detection device has the advantages of being capable of detecting potentials of different depths of an ocean platform steel structure, simple in operation, low in operation risk and low in cost.

Measuring MDEVM of a DUT includes splitting an RF signal output by a DUT into first and second RF signals; acquiring and digitizing the first and second RF signals in first and second channels without demodulating the first and second RF signals; performing equalization of the first and second RF signals; measuring first and second modulation distortion (MD) error vectors of the equalized first and second RF signals; performing cross-correlation of the first and second MD error vectors across the first and second channels; averaging the cross-correlated MD error vectors over symbols and packets of the RF signal; and dividing the averaged cross-correlated MD error vectors by signal power of an ideal signal to obtain cross-correlated MDEVMs over a time period or bandwidth of a waveform of the RF signal, where performing the cross-correlation suppresses contribution of uncorrelated noise.

A quantum modulation classifier. The quantum modulation classifier includes a trained quantum variational classifier including a plurality of qubits. The quantum variational classifier includes an embedding stage operable to apply a quantum embedding technique to embed a modulated radio signal, a variational stage operable to receive the modulated radio signal from the embedding stage and pass the modulated radio signal through a plurality of variational layers, and a measurement stage operable to receive the modulated radio signal from the variational stage and extract measurement results to classify the modulated radio signal.

A system for electromagnetic tomography within air-filled imaging chamber, thereby reconstructing 3D and / or 2D images ε(r)dupdated of dielectric properties of an object under the study, includes an electromagnetic measurements system, an imaging chamber having an air-filled central cavity, computational means, an analog-to-digital converter (ADC) for digitizing acquired EM signals from the electromagnetic measurements system, and a processor system that executes imagining and processing algorithms. The imaging chamber includes a dielectric layer surrounding the air-filled central cavity, a ceramic antenna layer surrounding the dielectric layer, and an absorptive layer surrounding the ceramic antenna layer, wherein the ceramic antenna layer includes an array of antennas that form part of the electromagnetic measurement system.

Disclosed herein are a motor failure diagnosis system and a motor failure diagnosis method. The motor failure diagnosis system includes a voltage diagnosis part calculating voltage based on duty information input into an inverter that outputs a three-phase signal to a motor, and comparing voltage output from a PI controller that receives current for operating the motor and outputs voltage, with voltage calculated based on the duty information input into the inverter, thereby diagnosing failure between the PI controller and the inverter.

An example apparatus is configured to electrically connect to a device under test (DUT). The apparatus includes a first interface circuit to communicate with a test instrument using a first protocol and a second interface circuit to receive signals containing data from the DUT having a second protocol. The second interface circuit is configured to oversample the signals containing data in voltage and time to produce sampled data. Oversampling includes sampling the signals containing data at a rate that is higher than the Nyquist rate. Circuitry is configured to receive the sampled data from the second interface circuit, to generate the data having the first protocol based on the sampled data, and to output the data having the first protocol to the test instrument via the first interface circuit.

An apparatus includes a clamping circuit configured to provide a predetermined voltage at an output of the clamping circuit, a clamping switch coupled to the output of the clamping circuit, and a pass device connected between the clamping switch and an input / output terminal of a controller.

A method for probing a circuit breaker electrically connected to an electric line is described. The probing method comprises injecting a first signal at a first point of said electric line. The probing method further comprises detecting a second signal at a second point of said electric line. The probing method further comprises processing a first portion of said second signal, to calculate a first signal value indicative of the signal power of said second signal in the frequency band of said first signal, during the first portion of said detection time interval. The probing method further comprises processing a second portion of said second signal, to calculate a second signal value indicative of the signal power of said second signal in the frequency band of said first signal, during the second portion of said detection time interval.

A ripple detection device and a ripple suppression device. The ripple detection device includes: a ripple sampling unit, at least two DC sampling units, and a digital signal processing unit; the ripple sampling unit outputs a first voltage signal at an output port of a non-isolated DC / DC bidirectional energy conversion unit to the digital signal processing unit; the DC sampling unit outputs a first DC signal in a second voltage signal at a connected port of the non-isolated DC / DC bidirectional energy conversion unit to the digital signal processing unit and blocks an AC signal in the second voltage signal to be output to the digital signal processing unit; the digital signal processing unit determines a ripple noise signal at the output port of the non-isolated DC / DC bidirectional energy conversion unit according to the first voltage signal and the first DC signal.

A system for electromagnetic tomography within air-filled imaging chamber, thereby reconstructing 3D and / or 2D images ε(r)dupdated of dielectric properties of an object under the study, includes an electromagnetic measurements system, an imaging chamber having an air-filled central cavity, computational means, an analog-to-digital converter (ADC) for digitizing acquired EM signals from the electromagnetic measurements system, and a processor system that executes imagining and processing algorithms. The imaging chamber includes a dielectric layer surrounding the air-filled central cavity, a ceramic antenna layer surrounding the dielectric layer, and an absorptive layer surrounding the ceramic antenna layer, wherein the ceramic antenna layer includes an array of antennas that form part of the electromagnetic measurement system.

The present invention relates to the technical field of optical modulators, in particular to a method for testing the half-wave voltage and modulation efficiency of a Mach-Zehnder modulator, comprising: controlling the input optical power from a beam splitter to be a fixed value, adjusting the output optical power of the Mach-Zehnder modulator to half of the maximum value of the output optical power; applying voltage values ​​and to an upper modulation arm and a lower modulation arm respectively; linearly fitting the relationship between the electro-optical phase shift and the voltage value generated by the upper modulation arm, and the relationship between the electro-optical phase shift and the voltage value generated by the lower modulation arm, to obtain a fitting coefficient; calculating the half-wave voltage of the upper modulation arm and the half-wave voltage of the lower modulation arm based on the fitting coefficient; and calculating the half-wave voltage of the Mach-Zehnder modulator. The present invention facilitates testing the half-wave voltage and modulation efficiency of a Mach-Zehnder modulator.

The invention relates to a motor failure diagnostic system and a motor failure diagnostic method. The motor failure diagnostic system comprises a voltage diagnostic section that calculates a voltage based on duty cycle information input to an inverter, which outputs a three-phase signal to a motor, and a voltage output from a PI controller, which receives a current to operate the motor and outputs a voltage, compared with a voltage calculated based on the duty cycle information input to the inverter, thereby diagnosing a failure between the PI controller and the inverter.

To solve the problem in which: it is desirable to have a simple fault diagnosis apparatus through which a system controller can reliably determine a fault status of an LED system.SOLUTION: An apparatus includes: a clamping circuit configured to supply a predetermined voltage at an output of the clamping circuit; a clamping switch coupled to the output of the clamping circuit; and a pass device connected between the clamping switch and an input / output terminal of a controller.SELECTED DRAWING: Figure 1

The present invention relates to a micro-current photon sensing detection device and method using a 5mA-type micro-current photon sensing NV quantum sensor, the device comprising: a power supply unit (100); a quantum dot qubit control signal generation module (200); a multi-channel pulse waveform generation control module (300); a bias magnetic field formation control module (400); a green laser generation control module (500); a microwave signal generation module (600); a micro-current sensing NV quantum sensor module (700); an optical fiber unit (800); a photodiode unit (900); and a micro-current photon analysis control module (900a), thereby supporting a wide frequency range to 10 GHz in DC through the quantum dot qubit control signal generation module.

To provide a measuring apparatus and a measuring method capable of suppressing a decrease in the correlation between MER and a CN ratio.SOLUTION: A measuring apparatus includes a receiving unit that receives a signal modulated with a predetermined modulation multilevel number from a transmission device, an extraction unit that extracts a signal that satisfies a predetermined condition from among the received signals, and a calculation unit that calculates a modulation error ratio of the extracted signal.SELECTED DRAWING: Figure 1

An example system is for testing a switched-mode power supply that includes a device associated with a pulse-width modulated (PWM) signal. The system includes a conductive structure wirelessly coupled to the device such that a change in electrical energy in the device produces a transient response on the conductive structure, and circuitry configured to perform operations that include: converting the transient response into an electrical signal, and generating, based on the electrical signal, a local PWM signal that corresponds to the PWM signal used in the switched-mode power supply.

A device for detecting a break in a motor's power cable may include a computing device with a processor and a storage medium on which one or more programs are recorded, configured to be executed by the processor, the one or more programs being able to: obtain a plurality of measured current values ​​from a plurality of current sensors, each detecting currents flowing in a plurality of windings of the motor corresponding to a plurality of phases of the motor; determine a plurality of correction current values ​​by removing a common-mode current from each of the measured current values; and detect a break in each of the phases based on a cable break index derived from the plurality of correction current values.

Disclosed is an apparatus for detecting a current of a power factor correction circuit, the apparatus detecting a current through a current sensor provided to allow a current corresponding to a current flowing in an inductor of a boost type power factor correction circuit to flow. The apparatus for detecting a current of a power factor correction circuit comprises a slope calculation unit for calculating a first slope corresponding to a slope of a current of the inductor in a period during which a switching element of the boost type power factor correction circuit is turned on, and a second slope corresponding to a slope of a current of the inductor in a period during which the switching element is turned off, determines a detection time point of the current of the inductor in the period during which the switching element is turned off if the magnitude of the first slope is greater than the magnitude of the second slope, and determines a detection time point of the current of the inductor in the period during which the switching element is turned on if the magnitude of the first slope is less than or equal to the magnitude of the second slope.