30 results about "Virtual ground" patented technology

Amplifiers with new circuit topologies for gain shaping and gain control are described herein. An example amplifier circuit with gain control includes a differential transistor pair, a main transistor pair coupled to the differential transistor pair, an auxiliary transistor pair coupled to the differential transistor pair, and a resistive impedance coupled between base terminals of the auxiliary transistor pair. The resistive impedance can include a pair of matched resistors coupled between base terminals of the auxiliary transistor pair. The amplifier can also include a capacitor coupled from a virtual ground node between the pair of matched resistors to ground. The amplifier circuits described herein can present a preferred gain response as compared to other amplifiers, at both midband and peaking frequencies. The amplifier circuits also offer additional options for control of gain at midband frequencies, among other benefits.

The invention relates to the technical field of power equipment state monitoring, and discloses a transformer oil paper insulation frequency domain response online monitoring system which comprises an interface protection module, a modulation control module, a servo balance module and a diagnosis reconstruction module. The interface protection module extracts end screen leakage current and provides overvoltage protection; the modulation control module tracks the bus voltage phase and generates broadband modulation excitation voltage; the servo balance module generates a reverse servo current through closed loop feedback, counteracts a power frequency component in a leakage current so as to maintain a virtual ground state of a measurement node, and injects broadband excitation in a superposed manner; and the diagnosis reconstruction module synchronously acquires signals, reconstructs data in combination with time sequence information, calculates equivalent complex admittance by utilizing cross-correlation demodulation, and outputs complex capacitance and a dielectric loss factor. According to the invention, the operating voltage is used as a carrier wave, strong power frequency interference is eliminated through hardware servo, and safe online excitation is realized by matching with phase chopping, so that the difficult problem of weak broadband signal extraction is effectively solved, and combined monitoring and diagnosis are realized.

A current measurement system, comprising a plurality of parallel sensing circuits, each sensing circuit configured to measure a respective range of voltage corresponding to a current through a load, wherein each sensing circuit is triggered to initiate measurement of a voltage across the load in response to a buffer current through a common buffer reaching a respective threshold, a buffer circuit for inputting a virtual ground voltage or a virtual ground current to the load and to the plurality of parallel sensing circuits, the virtual ground voltage corresponding to the voltage across the load or the current through the load, and a processor coupled to the plurality of parallel sensing circuits, wherein the processor is configured to combine data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the load.

This invention belongs to the field of microwave communication, specifically disclosing a low-parasitic amplitude modulation differential bridge T-type phase shifter. The ground terminals of the differential positive branch phase shifter circuit and the differential negative branch phase shifter circuit are connected to form a differential virtual ground. A first input port is connected to the input terminal of the differential positive branch phase shifter circuit via a matching circuit, and a second input port is connected to the input terminal of the differential negative branch phase shifter circuit via a matching circuit. The output terminal of the differential positive branch phase shifter circuit is connected to the first output port, and the output terminal of the differential negative branch phase shifter circuit is connected to the second output port. A first insertion loss adjustment circuit is connected in parallel between the matching circuit and the phase shifter circuit, and a second insertion loss adjustment circuit is connected in parallel between the phase shifter circuit and the signal output port. This invention reduces the difference in insertion loss between the bridge T-type phase shifter in the reference state and the phase shifter state, thus reducing parasitic amplitude modulation. This invention is applicable to phase control in phased array radar antenna elements.

The embodiment of the application provides a direct current offset correction method and a correction system, the method comprising: obtaining a first direct current output offset voltage of a complex filter to be corrected; determining a relationship between a direct current input voltage and the direct current output offset voltage under an ideal filter based on a preset virtual ground characteristic of an operational amplifier, according to an input current of an input point of the operational amplifier and a preset resistance of the complex filter; determining a to-be-corrected current according to the relationship between the direct current input voltage and the direct current output offset voltage under the ideal filter and the first direct current output offset voltage, and working under a normal working condition by using the to-be-corrected current; and based on the preset virtual ground characteristic of the operational amplifier, performing one or more iteration calculations on the input current of the input point of the operational amplifier, the preset resistance of the complex filter and the to-be-corrected current, so that a second direct current offset voltage is a preset value, the IQ structure of the complex filter is not damaged, and the I / Q two paths can be simultaneously corrected, and one-step correction is completed.

The present disclosure relates to an amplifier device for amplifying an input signal Sx at a device input X to an output signal Sy at a device output Y, for driving a loudspeaker or comparable reactive load, comprises a self-oscillating Class D power amplifier stage with transfer function KA(s). The amplifier stage includes a comparator, a power stage, and a second-order low-pass output filter comprising an inductor and a capacitor. A time delay unit provides a delay determined by one or more of the comparator, the power stage, and a first feedback filter. The output signal Sy is fed back to the comparator via the first feedback path to establish oscillation and provide basic low-frequency feedback. A correction stage is provided, comprising a second feedback path that feeds the output signal Sy, via a scaling resistor, to a virtual ground input of a transimpedance amplifier.

The invention provides a differential power amplification stage comprising a first amplification unit adapted to amplify a first differential signal and to output an amplified first differential signal, a second amplification unit adapted to amplify a second differential signal having opposite phase to the first differential signal and to output an amplified second differential signal, and a saturation detection unit adapted to detect gain saturation of the first and second amplification unit, to generate a saturation detection signal indicating the gain saturation of first and second amplification unit, and to provide a virtual ground for the first and second differential signals for RF cancellation on the first and second differential signals. The virtual ground principle is also applied to a Doherty power amplifier module which comprises a saturation detection unit for detecting saturation in the carrier amplification stage.

The invention discloses a laboratory sunlight energy-saving illumination management system, belongs to the technical field of energy-saving illumination, and solves the problems that a solar simulator bus is out of control due to bidirectional power conflict, an experiment is failed due to light ripple pollution, and energy conservation is more wasted. Comprising a multi-phase magnetic energy cyclic matrix module which generates a controlled multi-phase alternating current energy field; the rotating field transformer energy transfer device module is used for directionally distributing energy in a multi-phase alternating current energy field to each output channel according to a real-time instruction; the distributed virtual ground bus framework module is used for maintaining the power supply reference potential of each output channel; and the digital pre-distortion compensator module is used for performing nonlinear and memory effect compensation on an input instruction and sending the compensated instruction to the multi-phase magnetic energy cyclic matrix module. According to the invention, the rotating magnetic field is coupled with the distributed wireless energy network to decouple the power flow, the noise is suppressed, the spectrum is independent, the energy is saved, and repeated experiments are avoided.

This invention discloses an intelligent discharge device based on non-contact coupling and remote monitoring, relating to the field of high-voltage power equipment safety protection technology. It includes: a non-contact electrode module for generating a high-frequency magnetic field to establish a coupling channel, releasing the charge of the charged body into a virtual grounding loop through electromagnetic induction; a high-frequency energy conversion module for converting the charge of the charged body into a high-frequency pulse signal; an energy storage and release module for absorbing and neutralizing the charge coupling formed between the insulation layer and the charged body through a high-voltage capacitor matrix; a multi-dimensional sensing module for acquiring electric field, temperature, partial discharge, and voltage level and phase information of the charged body; an edge intelligent processing module for achieving adaptive optimization and fault self-diagnosis of the discharge process; and a dual-mode communication system for uploading discharge current, voltage waveform, and status data to a cloud platform in real time. This invention achieves adaptive discharge and remote monitoring of the charged body through hardware collaboration and algorithm optimization.

An ion wind-assisted electrostatic printing nozzle structure and method for micro / nano structures on insulating substrate surfaces includes an electrostatic printing nozzle, with an ion wind generating module coaxially connected to the outer side of the nozzle. The inlet at the top of the nozzle is connected to a driving air pressure source, and the nozzle at the bottom is connected to a high-voltage power supply. The ion wind generating module has a built-in ionization electrode that generates positive and negative ions upon applying a high voltage. These ions are then driven by airflow to form an ion wind, which is focused on the printing area below the nozzle, keeping the insulating substrate surface in a near-zero potential state, thus forming a virtual grounding electrode. This invention utilizes ion wind to construct a virtual grounding electrode on the insulating surface, solving the problem of unstable electric field during printing caused by variations in printing height and charge accumulation on the insulating surface, thereby improving the applicability of electrostatic printing to insulating substrates.

The application relates to a method and system for a pilot directional protection of LCC-HVDC lines based on virtual grounding resistance. The method comprises: Obtaining a conduction state information of a converter and characteristic parameters of a converter circuit within one commutation period after a fault occurs; according to the conduction state information and characteristic parameters, determining characteristic frequency of the circuit; according to the characteristic frequency and characteristic parameters, determining a virtual grounding resistance; according to the virtual grounding resistance, determining fault areas.

The present disclosure relates to a map data processing method, device, equipment, medium and product, the method comprising: acquiring map data of a first region and map data of a second region, the first region and the second region being obtained by different batches of collection, and there being an edge region of repeated collection, the map data comprising point cloud data; acquiring a pre-set virtual ground control point, the virtual ground control point being located in a recording block of the first region adjacent to the second region; based on the virtual ground control point, the map data corresponding to the recording block is split to obtain split map data of the first region and split map data of the second region; and taking the point cloud data associated with the virtual ground control point as a reference, the position of the point cloud data in the split first region and the point cloud data in the split second region are aligned. In this way, the data alignment between regions is decoupled, the position alignment of multiple regions can be performed at the same time, and the data waiting period is shortened.

The embodiment of the invention provides a transformer area identification device and system, the transformer area identification device comprises a relay assembly and a controller which are connected, the relay assembly is connected with a power supply, and the output end of the relay assembly is connected with virtual ground; the relay assembly comprises a first relay, a second relay and a third relay which are sequentially connected in series; the controller is configured to: control to disconnect all the phase lines; and circularly executing the steps of controlling to close one phase line and injecting the identification signal into the closed phase line until the identification signal is injected into all the phase lines, so as to transmit the identification signal to the intelligent electric meter in the transformer area through each phase line. Wherein the identification signal comprises a unique identity code of the transformer area, and the intelligent electric meter in the transformer area sends the identification signal to the data acquisition equipment, so that the data acquisition equipment identifies the intelligent electric meter in the transformer area according to the received identification signal. According to the invention, the accuracy of transformer area identification can be effectively improved.

The invention belongs to the technical field of capacitive voltage dividers, and particularly relates to a capacitive voltage divider based on an operational amplifier, which comprises a high-voltage capacitor, a low-voltage capacitor, a shielding structure, the operational amplifier and a double-T-shaped resistance-capacitance network, the high-voltage capacitor and the low-voltage capacitor are connected in series; the shielding structure is grounded and is used for shielding electric field coupling between the high-voltage capacitor and the ground; the positive input end of the operational amplifier is grounded, and the inverted input end and the output end of the operational amplifier are connected to the two ends of the low-voltage capacitor respectively. High-voltage and low-voltage capacitor series nodes are virtually grounded through operational amplifier negative feedback, a feedback circuit is not needed to compensate shielding potential, and additional errors are thoroughly avoided; and meanwhile, a rear-end high input impedance design is not needed, so that the circuit complexity and the hardware cost are reduced.

The invention relates to the technical field of digital image processing, and discloses an analog data generation and evaluation method and system for hyperspectral unmixing algorithm performance, and the method comprises the steps: generating an initial random grid based on a random seed; processing the initial random grid to generate a virtual ground feature distribution scene graph; processing the virtual ground feature distribution scene graph to obtain an initial abundance graph; performing superposition and normalization processing on a plurality of initial abundance maps generated based on the same random seed and different filtering parameters to generate a final abundance map; screening a group of end member spectrums, and monitoring the spectrum similarity between the end members; performing spectrum variation modeling on the screened end member spectrums to generate an end member spectrum set; according to the final abundance graph and the end member spectrum set, generating preliminary simulation spectrum data; adding noise into the preliminary simulation spectrum data to generate a final hyperspectral simulation data set, and evaluating the performance of the hyperspectral unmixing algorithm by using the data set, so that the objectivity and comprehensiveness of evaluation can be improved.

A differential amplifier circuit is provided. The circuit includes a PWM modulator for generating a PWM signal representative of a difference between the first and the second staircase-like reference signals and the digital input signal, a DM-IDAC for receiving the PWM signal and providing a first and second differential mode current, a CM-IDAC for receiving the PWM signal and providing a common mode current, first and second loop integrators, and first and second comparators; each loop integrator comprising virtual ground node terminal for receiving the differential mode current, the common mode current, and a feedback signal from an output stage of the differential amplifier circuit via a feedback loop, and integrator output terminal for providing loop integrator output signal proportional to an integral of the signals received at the virtual ground node terminal, the comparators receiving the loop integrator output signal, and triangular reference signal.

Systems and methods that integrate a directional coupling function with directivity that does not have output loss are disclosed. For example, a power amplifier circuit arrangement includes an input terminal to receive an input signal; amplifier circuitry including a first amplifier stage, a second amplifier stage, and a virtual ground node, where an input of the first amplifier stage is coupled to the input terminal, an output of the first amplifier stage is coupled to an input of the second amplifier stage via the virtual ground node, and an output of the second amplifier stage is coupled to the input of the first amplifier stage via feedback circuitry; an output terminal coupled to the output of the second amplifier stage, the output terminal to output an amplified signal; and a directional coupler terminal coupled to the virtual ground node.

The invention provides a grid bias circuit and a level shifter, a floating power supply domain is established between a power supply VCCB and a power supply VCCA, a bias voltage VBIAS = VCCA + VTH with the VCCA as a virtual ground is generated in the floating power supply domain through a current mirror mode, the bias voltage tracks changes of the VCCA, a clamping circuit ensures that the bias voltage stably rises to the VBIAS, no overshoot exists in the starting process, and therefore the stability of the grid bias circuit is improved. The problem of instantaneous electric leakage or transistor stress caused by excessively high transient voltage is avoided, electric leakage suppression is achieved, and the low-level transmission requirement is met.

The invention discloses a full-virtual flight simulation method and device and a computer readable storage medium, and the method comprises the steps: receiving a flight plan imported by a student through a virtual ground control station, and starting full-virtual flight according to the flight plan; receiving a flight fault injected by a teacher through the fault upper computer, and obtaining an abnormal flight state fed back by the full virtual aircraft model; uploading alarm information and flight parameters corresponding to the abnormal flight state to a virtual ground control station, and receiving a control operation executed by a student through the virtual ground control station; and obtaining an operation demand corresponding to the alarm information and the flight parameters, and generating a full virtual simulation result of the student according to the control operation and the operation demand. According to the invention, by injecting the specific fault into the full virtual flight, the trainee operates the virtual ground control station to implement the corresponding fault training, so that the hardware construction cost of the simulated flight training is reduced, the equipment does not need to be maintained, and the pertinence and effectiveness of the training are improved.

This invention discloses a sensor output conversion circuit, comprising: a conditioning chip, a voltage regulator, a path controller, and a negative feedback amplifier circuit. The negative feedback amplifier circuit includes an operational amplifier electrically connected to a first resistor, a second resistor, and a third resistor, used to convert a conditioned output signal in a first voltage range into a conditioned signal output in a second voltage range. This invention utilizes the virtual ground, near-infinite input impedance, and near-infinite common-mode rejection ratio of the operational amplifier to convert a conditioned output signal in the 0-5V range into a conditioned signal output in the 0-10V range, achieving a linear electrical connection between the sensor circuit and the industrial equipment circuit. Furthermore, by selecting components with different parameters and switching paths using the path controller, the initial signal calibration and conditioned signal output of the front-end conditioning chip can be conveniently achieved.

The invention provides a virtual object control method and device, equipment, a storage medium and a program product, and the method comprises the steps: displaying a virtual object in a virtual scene comprising a plurality of tasks, and displaying a task guidance element of a next task; in the virtual scene, a virtual track is displayed, the virtual track is connected with task points of at least two tasks, and the at least two task points comprise a target task point; in response to a taking operation for the virtual track, controlling the virtual object to take the virtual track, and moving to a target task point based on the virtual track along a direction indicated by the task guiding element; wherein the moving speed of the virtual object on the virtual track is greater than the moving speed of the virtual object on the virtual ground of the virtual scene; and when the target task point is reached based on the virtual track, controlling the virtual object to move to the virtual ground of the virtual scene from the virtual track so as to execute the next task. In this way, the interaction modes in the virtual scene can be enriched, and the man-machine interaction efficiency and the hardware resource utilization rate are improved.

A front-end configuration of a transceiver combines two sets of Power Amplifiers (PA) (each set comprising, e.g., one differential PA or two single-ended PAs in anti-phase) and two Quadrature Hybrid Couplers (QHC) as a balanced PA circuit that is robust to load modulation. A Low Noise Amplifier (LNA) is connected, and protected from direct and reflected TX signals, such that a TX / RX antenna switch is not needed. The ISO ports of the two QHCs are connected to a symmetrical passive 3-port network connected to the LNA input. In TX-mode, inputs of the 3-port network are excited differentially, and the network terminates any TX signal reflected from the antenna in a resistive load, while presenting a virtual ground at its input. In Rx mode, the output impedances of the sets of PAs are reconfigured to make the received signal appear at the inputs of the 3-port network in common-mode.

The embodiment of the invention discloses an interaction method and device based on a virtual object, computer equipment and a storage medium, and belongs to the technical field of virtual scenes. The method comprises the following steps: displaying a virtual scene corresponding to a virtual game, and displaying a master control virtual object and virtual ground elements laid on a virtual ground in the virtual scene in response to an exit event of the master control virtual object; and in response to a moving operation on the master virtual object, controlling the master virtual object to move towards the virtual battlefield on the virtual ground element. According to the method, the exit effect of the master control virtual object in the virtual scene is improved, the interaction effect of the virtual object and the virtual scene is improved, and the display effect of the master control virtual object entering the virtual battlefield can be improved, so that a user is promoted to control the master control virtual object to enter the virtual battlefield to fight with other virtual objects, and the user experience is improved. And the interaction effect between different virtual objects participating in the same virtual game is improved, so that the user experience is improved.

The present invention provides a voltage controlled oscillator based on multiple cores A voltage controlled oscillator based on multiple cores, according to the present invention, comprises: a noise circulation oscillation circuit; a common tail inductor which connects a first voltage controlled oscillation core circuit including the noise circulation oscillation circuit, with a second voltage controlled oscillation core circuit including the noise circulation oscillation circuit, and is used as a noise filter and a virtual ground; two or more degenerate transistors provided as a part of the noise circulation oscillation circuit to provide a noise circulation function in a biased state in a triode region; and two or more control capacitors corresponding to the two or more degenerate transistors, respectively, to control the two or more degenerate transistors in an on or off state.

A liquid crystal antenna includes an upper substrate, a lower substrate, a liquid crystal layer, a first metal layer, and a second metal layer. The liquid crystal layer is disposed between the two substrates. The first metal layer is located between the lower substrate and the liquid crystal layer, and includes two opposite differential signal lines electrically connected to two electrode wires, respectively. The two differential signal lines and the two electrode wires form a mirror symmetry with a virtual ground line being an axis of symmetry. The second metal layer is located between the upper substrate and the liquid crystal layer, and includes a plurality of line segments arranged at intervals. Vertical projections of the line segments overlap with the two differential signal lines. The second metal layer forms a mirror symmetry with a virtual symmetry plane including the virtual ground line and perpendicular to the two substrates.

The application provides an airborne magnetotelluric data processing method, device and equipment and a storage medium, relates to the technical field of geophysical exploration, and comprises the following steps: arranging at least two ground base stations in a target exploration area and determining the plane coordinates of the ground base stations; acquiring horizontal electric field time series collected by each base station; synchronously collecting magnetic field time series and space coordinates of an air measurement point through an air mobile platform; projecting the space coordinates to the ground to obtain a projection point, and determining a dynamic weight coefficient according to the horizontal distance from the projection point to each base station; generating a virtual ground electric field by weighting and fusing the horizontal electric field and the corresponding weight coefficient; pairing the virtual ground electric field and the magnetic field time series, converting to the frequency domain, solving the tensor impedance and determining the electrical parameter of the target exploration area. The application is used for solving the problem of spatial position mismatch between the air mobile measurement point and the ground fixed base station under the existing single base station architecture.

This invention, entitled "A Three-Phase Electrical Parameter Measurement System and Method Based on Dual Metering Chips," belongs to the field of power measurement technology. The technical problem it aims to solve is that existing three-metering chip solutions for three-phase electrical parameter measurement suffer from high hardware costs, difficulty in balancing computational accuracy and real-time performance, and high demands on processor computing power. The key technical solution involves using two high-precision metering chips to collect the instantaneous values ​​of phase B and phase C voltage and current, respectively. The main controller integrates synchronization control, voltage calculation, and current calculation modules. The synchronization control module achieves two-phase data synchronization through a lightweight state machine and synchronization flags. The voltage calculation module uses a virtual ground algorithm to analytically solve for the coordinates of the reference ground potential point F to calculate the phase A voltage. The current calculation module uses a vector algorithm to invert and obtain the phase A current, ultimately achieving complete measurement of the three-phase electrical parameters.

The invention discloses a three-phase electric parameter measurement system and method based on double metering chips, and belongs to the technical field of electric power measurement. The technical problems to be solved are that the existing three-metering chip scheme for three-phase electric parameter measurement is high in hardware cost, calculation precision and real-time performance are difficult to consider at the same time, and the requirement for the calculation capability of a processor is high. According to the technical scheme, two high-precision metering chips are adopted to respectively collect instantaneous values of B-phase voltage and C-phase voltage and current, and a synchronous control module, a voltage calculation module and a current calculation module are arranged in a main controller; the synchronous control module realizes double-phase data synchronization through a lightweight state machine and a synchronous flag bit, the voltage calculation module adopts a virtual ground algorithm to analyze and solve coordinates of a reference ground potential F point so as to calculate A-phase voltage, the current calculation module obtains A-phase current through inversion based on a vector algorithm, and finally complete measurement of three-phase electric parameters is realized.

The invention relates to the technical field of intelligent traffic management, in particular to a roadside parking state judgment method and system based on wheel detection, and the method comprises the steps: obtaining a to-be-detected video frame covering a target parking space; inputting the video frame to be detected into a wheel detection model, and outputting position information of each identified vehicle wheel image; calculating and extracting center point coordinates of the bottom edge of the bounding box for each vehicle wheel image, and determining the center point coordinates as virtual ground contact points corresponding to the corresponding vehicle wheels; traversing all the virtual ground contact points, generating candidate landing point connecting lines representing potential vehicle positions in a pairwise combination mode, and calculating an occupation proportion value for each candidate landing point connecting line; and comparing each occupancy proportion value with a preset parking state judgment threshold value to obtain the occupancy state of the target parking space. According to the invention, the problem of how to realize high-robustness parking space occupancy state automatic identification in a complex visual interference environment is effectively solved.