66 results about "Common-mode signal" patented technology

A power system including a power converter system and an electric machine is provided. In one aspect, the power converter system has first and second switching elements. The electric machine includes a first multiphase winding electrically coupled with the first switching elements and a second multiphase winding electrically coupled with the second switching elements. The first and second multiphase windings are arranged and configured to operate electrically opposite in phase with respect to one another. One or more processors control the first switching elements to generate first pulse width modulated (PWM) signals based on received voltage commands to render a first common mode signal and also control the second switching elements to generate second PWM signals based on received voltage commands to render a second common mode signal. The rendered first and second common mode signals have the same or similar waveform with opposite polarity with respect to one another.

A power system including a power converter system and an electric machine is provided. In one aspect, the power converter system has first and second switching elements. The electric machine includes a first multiphase winding electrically coupled with the first switching elements and a second multiphase winding electrically coupled with the second switching elements. The first and second multiphase windings are arranged and configured to operate electrically opposite in phase with respect to one another. One or more processors control the first switching elements to generate first pulse width modulated (PWM) signals based on received voltage commands to render a first common mode signal and also control the second switching elements to generate second PWM signals based on received voltage commands to render a second common mode signal. The rendered first and second common mode signals have the same or similar waveform with opposite polarity with respect to one another.

The invention relates to the technical field of optical element surface physical property testing, and discloses an optical element surface pattern structured light testing system which comprises the steps that a pair of phase-conjugated structured light fields are adopted to alternately illuminate an optical element, and Fourier domain diffraction patterns and spatial domain in-situ light field intensity distribution of the optical element are synchronously collected; according to the method, a common-mode signal cancellation mechanism aiming at a defect-free periodic pattern is preset on a physical level through conjugate illumination and differential processing, so that massive redundant information is suppressed, and the defect position is determined by calculating a differential signal after a diffraction pattern is corrected by using in-situ light field intensity distribution. According to the method, only asymmetric scattering signals caused by defects are reserved and highlighted, so that the focus of detection is changed from measurement of the accuracy of geometrical morphology to discrimination of the uniformity of optical response physical properties of materials, and high-signal-to-noise-ratio rapid discrimination of functional defects is realized.

The embodiment of the invention provides a multi-lead wireless wearable myoelectricity acquisition system, and belongs to the crossing field of biomedical engineering and electronic technology. The electromyographic acquisition system comprises an electromyographic electrode pair module used for acquiring electromyographic signals and sending the electromyographic signals to an active circuit module; the active circuit module is used for processing the received electromyographic signals so as to improve the anti-interference capability and the acquisition accuracy, and sending the processed electromyographic acquisition input signals to the electromyographic acquisition module; due to the special design of the active circuit module, the active circuit module has the characteristics of ultrahigh input impedance, low voltage noise, bias current and the like, noise interference of electromagnetism, environment, motion and the like can be effectively resisted, meanwhile, power frequency interference is further reduced by processing common-mode signals through the auxiliary driving module, the stability and reliability of electromyographic signal acquisition in a complex environment are ensured, and the electromyographic signal acquisition efficiency is improved. And signals can be accurately acquired in sports venues or places with dense electronic equipment.

The utility model relates to the technical field of transducers, and discloses an ultrasonic echo detection circuit, comprising a common-mode module which is connected to a first echo input end and a second echo input end, receives a first input signal and a second input signal, and is used for carrying out common-mode processing on the first input signal and the second input signal and sending the processed signal to a processor; obtaining and outputting a first direct-current signal and a second direct-current signal; the amplification module is connected with the common-mode module, receives the first direct-current signal and the second direct-current signal, amplifies the first direct-current signal and the second direct-current signal respectively, and outputs the amplified first direct-current signal and the amplified second direct-current signal; and the filtering module is respectively connected with the amplification module and the echo output end, receives the amplified first direct current signal and the amplified second direct current signal, filters common-mode signals for the amplified first direct current signal and the amplified second direct current signal to obtain a differential signal, and outputs the differential signal to the echo output end. The problems that detected ultrasonic echo signals are large in signal noise and low in integrity are solved.

The application relates to an antenna assembly and an electronic device, wherein the antenna assembly comprises a main body part and a feeding assembly, the main body part is provided with a first slot antenna and a second slot antenna and an isolation structure, a first feeding part and a second feeding part are arranged in the first slot antenna and the second slot antenna respectively, the isolation structure can comprise a first isolation slot perpendicular to the slot antenna and / or a second isolation slot parallel to the slot antenna, the first isolation slot is used for adjusting a differential mode signal impedance, the second isolation slot is used for adjusting a common mode signal impedance, the overall isolation degree of the antenna assembly is improved by adjusting the differential mode signal impedance and / or the common mode signal impedance, so that the signal quality of the antenna is improved, the possibility of mutual interference between different signals is reduced, and the actual use requirement is met.

The invention discloses a bidirectional amplifier structure, a front-end system, a chip array element and a phased array system. The bidirectional amplifier structure comprises a differential mode signal amplification path; a common mode signal amplification path; the four-branch waveguide joint comprises a common-mode amplification interface, two differential-mode amplification interfaces and two antenna interfaces, the differential-mode amplification interfaces are in one-to-one correspondence with the antenna interfaces, the differential-mode amplification interfaces are connected with the differential-mode signal amplification path, and the common-mode amplification interface is connected with the common-mode signal amplification path; the amplification stage comprises a differential amplification circuit and a common mode amplification circuit; and the matching stage comprises a differential mode matching structure and a common mode matching structure, the differential mode matching structure is connected with the differential amplification circuit, and the common mode matching structure is connected with the common mode amplification circuit. According to the structure of the bidirectional amplifier, the working mode of simultaneous working or time-sharing working is realized by utilizing the characteristics of a signal differential mode and a common mode, and the bidirectional amplifier has higher working efficiency, higher circuit multiplexing rate and higher integration level. The invention relates to the technical field of microwave communication.

A differential channel circuit structure is disclosed. The differential channel circuit structure comprises a first differential circuit including a differential channel and a termination circuit. The differential channel has a differential mode impedance and a common mode impedance, and includes a first end and a second end, each capable of processing at least a first differential signal and a first common mode signal. The termination circuit includes a third end and a fourth end connected to the first end and the second end of the differential channel respectively, so as to simultaneously match the differential mode impedance and the common mode impedance of the differential channel.

A method, a control circuit, and a power converter arrangement are disclosed. The method includes: coupling three power converters (1, 2, 3) with each other; connecting each of the three power converters (1, 2, 3) to a 3-phase power source (4) configured to provide three supply voltages (Ua, Ub, Uc); and regulating a respective input signal (V1, V2, V3; I1, I2, I3) of each of the three power converters (1, 2, 3) dependent on a common mode signal (Scm).

The invention provides an arc fault breaker, an energy storage unit, an energy storage device and an energy storage system, relates to the technical field of energy, and is used for improving the sampling capability of the arc fault breaker and further improving the accuracy of arc fault detection. The arc fault breaker comprises a first current sensor, a second current sensor, a first signal detection circuit, a second signal detection circuit and a controller. The first current sensor and the second current sensor are used for outputting a first sampling signal and a second sampling signal respectively according to a current signal transmitted between the battery module and the converter; the first signal detection circuit is used for outputting a differential mode signal according to the first sampling signal and the second sampling signal; the second signal detection circuit is used for outputting a common-mode signal according to the first sampling signal and the second sampling signal; and the controller is used for disconnecting the battery module and the converter under the condition that the spectrum characteristic of the differential mode signal and the spectrum characteristic of the common mode signal are matched with the spectrum characteristic of the arc fault signal.

A plug connector (200) includes a plug housing (210) having a power contact channel (212) and first and second module channels (214). The plug connector includes power contacts received in the power contact channels and a data module (400) received in the first module channel. The data module includes a data module housing (410) that holds signal contacts (402) terminated to an end of a signal line (404) of a data cable (206). The plug connector includes a common mode end node terminal module (500) received in the second module channel, the end node terminal module having a common mode signal processing assembly with an end node PCB (552) having a common mode control circuit and signal processing components for processing signals on the common mode control circuit. The plug connector includes a jumper contact (600) and a ground jumper contact (700) electrically connected to the common mode end node terminal module.

To suppress the effect of common-mode noise signals superimposed on differential communication signals on communication.SOLUTION: A transmitting / receiving circuit 11 includes an attenuator 26 that attenuates a differential communication signal input via an insulation circuit 8 and supplies the attenuated signal to a receiving circuit 25, and a common mode signal suppression circuit 28 that suppresses a common mode noise signal superimposed on the differential communication signal based on an output signal of the attenuator 26. The common mode signal suppression circuit 28 includes a common mode signal detection circuit that detects a common mode voltage in the output signal of the attenuator 26, a first current generation circuit that generates a first correction current proportional to a first different voltage when the first different voltage obtained by subtracting a first reference voltage from the detected common mode voltage is a negative voltage, and supplies the first correction current to an input / output terminal of the transmitting / receiving circuit 11, and a second current generation circuit that generates a second correction current proportional to a second different voltage when the second different voltage obtained by subtracting the detected common mode voltage from a second reference voltage is a positive voltage, and supplies the second correction current to the input / output terminal of the transmitting / receiving circuit 11.SELECTED DRAWING: Figure 3

A power converter is provided. In one aspect, the power converter has a first inverter and a second inverter electrically coupled with one another and with a power bus. First switches of the first inverter are arranged symmetrically with second switches of the second inverter so that, when switched in a pulse width modulated switching scheme, the first switches generate a first common mode signal and the second switches generate a second common mode signal that is one hundred eighty degrees out of phase with the first common mode signal. In another aspect, the power converter includes a buck stage having one or more pairs of symmetrically arranged buck switches that can be controlled to reduce or eliminate common mode electromagnetic interference in the buck stage. The power converter can also include one or more pairs of symmetrically arranged inductors.

The present disclosure relates to a diplexer with an impedance inverter. The diplexer can be used to isolate a transmitter and a receiver that share a common antenna. The diplexer is balanced by using an impedance gradient that provides an impedance that causes a balun of the diplexer to cut off access to the common antenna rather than replicate the antenna impedance. Such a cut off can have lower insertion loss than a diplexer that replicates the antenna impedance only to separate differential signals and common mode signals of the receiver and transmitter.

A voltage sensing circuit for measuring a load connected to a power amplifier, the load for receiving opposite phase first and second voltages, the voltage sensing circuit comprising a first input coupled to the first voltage, a second input coupled to the second voltage, a first voltage divider circuit, a second voltage divider circuit, and a second voltage divider circuit. The circuit includes a first voltage divider circuit including an input coupled to the first input terminal and an output coupled to the first output terminal, a second voltage divider circuit including an input coupled to the second input terminal and an output coupled to the second output terminal, and a driver circuit including a first input for receiving a reference voltage, a second input to receive a common mode signal of the first and second voltage divider circuits, and an output to drive an output common mode voltage of the first and second voltage divider circuits with the reference voltage.

A plug connector includes a plug housing having a power contact channel and first and second module channels. The plug connector includes a power contact received in the power contact channel and a data module received in the first module channel. The data module includes a data module housing holding signal contacts terminated to ends of signal wires of a data cable. The plug connector includes a common mode end node termination module received in the second module channel having a common mode signal processing assembly with an end node PCB with a common mode control circuit and signal processing component for processing signals on the common mode control circuit. The plug connector includes jumper contacts and a ground jumper contact electrically connected to the common mode end node termination module.

A signal detection circuit (400) includes a signal input terminal (402), a rectifier circuit (404), a comparator circuit (406); a current source (408), and a comparator output terminal (412). The rectifier circuit (404) is coupled to the signal input terminal (402) and configured to receive an input signal and generate a rectified signal based on the input signal. The comparator circuit (406) is coupled to the rectifier circuit (404) and configured to receive a common mode signal and generate a difference current based on a difference of the common mode signal and the rectified signal. The current source (408) is coupled to the comparator circuit (406) and configured to generate a reference current. The comparator output terminal (412) is configured to provide an output signal based on a difference of the reference current and the difference current.

A wireless power transfer transmitter can include a transmitter coil configured to deliver power to an inductively coupled receiver coil in a wireless power transfer receiver, a power converter configured to drive the transmitter coil, and means for driving the transmitter coil with a common-mode coupled communication signal to the wireless power transfer receiver. The means for driving the transmitter coil with the common-mode coupled communication signal to the wireless power transfer receiver can include a common mode signal driver configured to receive a data input signal and generate therefrom a signal to be injected into the transmitter coil. Alternatively, the means for driving the transmitter coil with the common-mode coupled communication signal to the wireless power transfer receiver can include a controller configured to drive the inverter with alternating complementary duty cycles.

The application discloses a new general method for eliminating electric and magnetic interference in measurement system. For electric measurement using differential amplifier, common mode signal is led out from differential amplifier and amplified as interference signal. After the amplified signal is sampled, it is used as interference template. The matching template component is searched in signal and then subtracted from the signal to eliminate interference and improve signal to noise ratio. For magnetic signal detection sensor using gradient coil structure, the center is grounded and two signal ends output mixed signal containing common mode component representing interference and measured signal. The common mode component is led out from differential amplifier as interference template to complete elimination of interference component in signal through the same template matching analysis and subtraction. The method for eliminating electromagnetic interference can be widely used in electric and magnetic signal measurement system.

The invention relates to the technical field of measuring instrument detection, and discloses an empty pipe detection method and system of an electromagnetic flowmeter and the electromagnetic flowmeter. The method comprises the steps that an excitation signal is applied to a signal electrode within a preset time period; wherein the preset time period is the front section of each half excitation period of the excitation signal; acquiring a to-be-sampled signal in a preset time period, and calculating an empty pipe detection voltage between a signal electrode and a grounding electrode according to the to-be-sampled signal; calculating the conductivity of the medium in the pipe according to the first preset value, the second preset value and the empty pipe detection voltage; according to the conductivity, whether the electromagnetic flowmeter is in a blank pipe state or not is detected. According to the embodiment of the invention, the influence of a common-mode signal on blank pipe detection can be reduced, and the blank pipe detection accuracy of the electromagnetic flowmeter is further improved.

An isolation circuit for isolating a transmitting end and a receiving end is provided. The isolation circuit comprises: a clock end configured to receive a clock signal; a common mode signal end configured to receive a common mode signal; a transmitting end circuit configured to: perform signal processing on a plurality of data signals, the clock signal, and the common mode signal; and output a first signal comprising the plurality of data signals, the clock signal, and the common mode signal after signal processing; an isolation capacitor circuit configured to isolate a direct current component in the first signal to output a second signal; and a receiving end circuit configured to: demodulate the second signal to obtain a third signal corresponding to the plurality of data signals and a fourth signal corresponding to the clock signal; and demodulate and demultiplex the third signal based on the fourth signal.

The invention provides an electromagnetic prospecting device and method based on an automobile shell, and the device comprises at least two electromagnetic signal collectors which are used for collecting electromagnetic signals in at least two directions; the common-mode signal suppression module is used for eliminating common-mode signals caused by environments and vehicles in the electromagnetic signals and generating differential-mode signals caused by characterization minerals; the vehicle-mounted dynamic interference suppression module is used for collecting interference source noise signals of the vehicle and eliminating the interference source noise signals in the differential mode signals to obtain pure signals; the prospecting module is used for inputting the pure signal into a mineral identification model to obtain the mineral existence probability and the mineral type; the mineral identification model is a deep learning model for representing the mapping relation between the pure signal and the mineral existence probability and the mineral type. The automobile shell serves as the antenna, the prospecting efficiency is improved, and the prospecting accuracy is improved through the electromagnetic signal processing process.

The present invention provides a calibration method of a transmitter, wherein the transmitter includes a power amplifier, a transformer, an adjusting circuit and a coupling circuit, wherein the power amplifier receives an input signal to generate an amplified input signal, the transformer receives the amplified input signal to generate an output signal, the adjusting circuit adjusts phase and amplitude of a common mode signal of the amplified input signal to generate a first signal, and the coupling circuit generates a coupled signal to the output signal according to the first signal. In addition, the calibration method includes: controlling the adjusting circuit to have a specific setting of the phase and amplitude adjustment for the common mode signal, to effectively eliminate a second harmonic generated due to the power amplifier, to improve electromagnetic interference and signal quality.

A readout circuit for an amplitude modulating sensor includes a first and second wavelength light source; an optical coupler coupled to receive a first light signal from the first wavelength light source and a second light signal from the second wavelength light source; a frequency selector that allows for the first light signal to pass to the amplitude modulating sensor; and a detector system coupled to the optical coupler to receive the first light signal and the second light signal after the first light signal is modulated by the amplitude modulating sensor and independently detect the two signals. The detector system generates electronic signals representing the modulated first light signal and the second light signal and removes a common mode signal of the modulated first light signal and the second light signal, removing common mode noise or attenuation in the modulated first light signal.

An electric motor (168) is driven by modulating an inverter (164) that supplies energy to the motor (168). Clamp modulation is used to produce an output line-to-line voltage, which enable the generation of direct current (DC) or low-frequency alternating current (AC) currents. The clamp modulation generates different combinations of switch states that result in zero output line-to-line voltage, which distributes losses between the switches and diodes differently. The distribution lowers the junction temperatures of the switches and diodes, thereby increasing the inverter's reliability and efficiency. The method can be implemented using either a carrier-based approach, which injects a common mode signal (116) into the modulation signal (120), or a direct switch state vector-based approach, which uses various combinations of switch states in terms of order and time duration.

The invention relates to a passive electrical component for attenuating common-mode and differential-mode disturbances on at least two electrical lines leading to the component, having two annular cores, at least two windings being arranged on each annular core, the two windings on the first annular core being wound and / or interconnected in such a way that the two windings on the second annular core are wound and / or interconnected. The windings are wound and / or interconnected on the second annular core in such a way that a high attenuation of common-mode signals on the electrical line is achieved, and wherein the windings on the second annular core are wound and / or interconnected in such a way that a high attenuation of differential-mode disturbances on the electrical line is achieved.

An electric motor is driven by modulating an inverter that supplies energy to the motor. Clamp modulation is used to produce an output line-to-line voltage, which enable the generation of direct current (DC) or low-frequency alternating current (AC) currents. The clamp modulation generates different combinations of switch states that result in zero output line-to-line voltage, which distributes losses between the switches and diodes differently. The distribution lowers the junction temperatures of the switches and diodes, thereby increasing the inverter's reliability and efficiency. The method can be implemented using either a carrier-based approach, which injects a common mode signal into the modulation signal, or a direct switch state vector-based approach, which uses various combinations of switch states in terms of order and time duration.

A power filtration system filters out a common mode signal from a DC conductor of a power system. The power filtration system comprises a first filter and at least one of a load or a power circuit. The first filter is connected to the DC conductor and configured to pass the common mode signal. The load is configured to dissipate the energy of the common mode signal. The power circuit is configured to conduct the common mode signal to an energy storage device.

The invention discloses a far-end crosstalk evaluation method, device and equipment for a microstrip line signal and a storage medium. The method comprises the following steps: decomposing a signal with the amplitude of A at an attacker sending end into a first step signal and a second step signal with the amplitude of A / 2, and decomposing a static signal with the amplitude of 0 at a victim sending end into a third step signal with the amplitude of A / 2 and a fourth step signal with the amplitude of-A / 2, synthesizing the first step signal and the fourth step signal into a differential signal, synthesizing the second step signal and the third step signal into a common-mode signal, acquiring a first response of the differential signal at the receiving end of the victim, and acquiring a second response of the common-mode signal at the receiving end of the victim, and based on the first response and the second response, obtaining the far-end crosstalk of the attacker to the victim, and through signal decomposition and superposition operation, improving the evaluation speed of the far-end crosstalk on the basis of keeping high evaluation accuracy, and well meeting the needs in practical application.

The invention belongs to the field of cable fault monitoring, and relates to a frequency common-mode signal injection method. A voltage common-mode signal is injected at the neutral point, the voltage signal is equally superposed on each phase cable to form a common-mode voltage signal, under the action of the common-mode voltage signal, the potentials of each phase cable are the same, current cannot be induced in a connected load, and non-intrusive online monitoring is realized; meanwhile, the generated leakage current only flows through the cable insulator, the change of the load does not affect the leakage current, and the system is suitable for various operation conditions of the system. Compared with a traditional direct current or low-frequency voltage superposition method, power frequency voltage superposition can amplify the insulation capacitive characteristics of the cable, and the monitoring precision and sensitivity are improved. And the required monitoring voltage amplitude is also reduced, so that the proposed monitoring scheme is easier to implement. Meanwhile, the magnitude of the measured leakage current can be changed by adjusting the amplitude of the injected monitoring voltage, and the monitoring flexibility is improved.