47 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 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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a coupler based on dielectric integrated suspended parallel strip lines and communication equipment, and relates to the technical field of microwave transmission. The coupler comprises a dielectric integrated suspended line platform, a differential coupler circuit and a defect metal ridge structure. According to the differential coupler, the defect metal ridge structure is arranged between the upper signal conduction band and the lower signal conduction band, the structure is coupled with the conduction bands to generate resonance under the excitation of a common-mode signal, so that the common-mode signal is effectively suppressed, and the overall size of the differential coupler is reduced through spatial multiplexing on the structure while the common-mode suppression function is realized. Besides, the dielectric integrated suspended line platform is provided with an electromagnetic shielding cavity, and the differential coupler circuit is suspended in an air cavity in the electromagnetic shielding cavity, so that dielectric loss and radiation loss are effectively reduced, and signal transmission efficiency is improved.

The present application relates to a circuit board, an electronic device and a method of manufacturing a circuit board. The circuit board comprises a first layer; a first insulating layer; a second layer coupled to a ground level and provided with a resonant structure, the first insulating layer being located between the first layer and the second layer; and at least one conductive via having a first end coupled to the resonant structure and a second end at a surface of the first layer, the at least one conductive via extending from the second layer to the surface of the first layer through the first insulating layer. By providing the conductive via between the first and second layers and coupled to the resonant structure, the common mode signal suppression or filtering frequency band can be flexibly tuned.

The invention discloses a measurement type picometer-level displacement resolution generation method based on twin double cavities, and the method comprises the steps: employing a group of twin Fabry-Perot cavities with matched parameters, and the twin Fabry-Perot cavities comprise a measurement cavity and a reference cavity; based on the PDH technology, the lasers of the two lasers are locked to harmonic peaks of the measuring cavity and the reference cavity respectively, and then the resonant frequency is measured through an optical frequency comb to represent the displacement amount; a set frequency stepping signal is output through an optical phase-locked loop, the frequency stepping signal is converted into a voltage control signal to be loaded to a PZT of a measurement cavity, the PZT is driven to drive a reflector to move so as to change the cavity length, and a controllable picometer-scale standard displacement step is generated. According to the invention, on the basis of twin Fabry-Perot cavity resonant frequency differential mode detection, a common mode signal caused by Fabry-Perot cavity environment noise can be suppressed, the cavity length displacement is directly traced to an optical frequency standard, and absolute traceability and high-resolution measurement of a picometer-level displacement signal are realized.

An interface circuit includes a current summer, a pair of slicers and a pair of replica summing circuits. The current summer is configured to sum currents representative of a signaling state of an input signal in a sequence of transmission intervals. A first slicer is configured to generate a first decision based on a comparison of an output of the current summer and voltage level of a first threshold signal. A second slicer is configured to generate a second decision based on a comparison of the output of the current summer and voltage level of a second threshold signal. A first replica summing circuit is configured to generate the first threshold signal based on a common-mode signal that is representative of the common-mode voltage at the input of the current summer. A second replica summing circuit is configured to generate the second threshold signal based on the common mode signal.

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 invention discloses an information security module for a power distribution network, comprising a plastic housing (4) and a module circuit board (15) disposed within the plastic housing (4); four connection terminals (2) are disposed on the upper surface of the module circuit board (1), one end of the connection terminal (2) being welded to the module circuit board, and the other end penetrating the top plate of the plastic housing (4) and extending outside the plastic housing; at least one casting hole (13) is disposed on the bottom plate (7) of the plastic housing (4); an information security circuit is integrated on the module circuit board (10), the information security circuit comprising a first differential mode signal suppression unit, a common mode signal suppression unit, and a second differential mode signal suppression unit. The present invention uses components such as capacitors, yoke coils, and resistors to perform multiple filtering and multiple blocking on power carrier communication signals flowing through the loop without affecting normal power frequency current, thereby helping to ensure information security of the power distribution network.

The embodiment of the invention relates to equipment and a method for receiving a 1-bit amplitude modulation signal. An apparatus receives a 1-bit amplitude modulated input signal. The apparatus includes a differential amplifier circuit having a first differential input and a second differential input, where the first input is configured to receive an input signal and the second input is configured to receive a common mode signal having a variable value. The device also includes circuitry to modify a value of the common mode signal as a function of a value of an output signal of the receiver device obtained from an output signal of the differential amplifier circuit.

In a multi-channel electrocardiogram measuring device including a plurality of electrocardiogram measuring sections for measuring an electrocardiogram, it is made possible to obtain a clear electrocardiogram while suppressing noise. An electrocardiogram measuring section (13) includes a positive and negative pair of electrode bodies (20, 21) configured as a capacitively coupled electrode and capable of being disposed in a non-contact state on a human body, a signal amplifying section (23) that amplifies electrical signals from the two electrode bodies (20, 21) and outputs the signals as electrocardiogram signals, and an inverting output section (28) that inverts common mode signals of the electrical signals from the two electrode bodies (20, 21) and outputs the signals as inverted signals. When the electrocardiogram measuring section (13) in which the inverted signals from the inverting output section (28) are input to the positive electrode body (20) is defined as a first channel (13A) and the electrocardiogram measuring section (13) in which the inverted signals from the inverting output section (28) are input to the negative electrode body (21) is defined as a second channel (13B), the two channels (13A, 13B) are simultaneously present.

The present application relates to the technical field of optical element surface physical property testing, and discloses a structured light testing system for optical element surface patterns, which comprises: a pair of phase conjugate structured light fields for alternately illuminating the optical element, synchronous acquisition of Fourier domain diffraction patterns and spatial domain in-situ light field intensity distribution, and calculation of a differential signal to determine a defect position after correction of the diffraction patterns by the in-situ light field intensity distribution. The present application presets a common mode signal cancellation mechanism for defect-free periodic patterns at the physical layer level through conjugate illumination and differential processing, thereby suppressing a large amount of redundant information and retaining and highlighting only the asymmetric scattering signal caused by defects, which makes the focus of detection shift from the accuracy of measuring geometric morphology to the uniformity of distinguishing the physical properties of material optical response, and realizes high signal-to-noise ratio rapid discrimination of functional defects.