41 results about "Passive networks" patented technology

A triple-active bridge (TAB) converter and methods to optimize the same is disclosed. The TAB converter includes a high-frequency three-winding transformer and three active full bridges, each coupled to the high-frequency transformer through a different passive network. The converter also includes a centralized controller providing gating pulses to semiconductor switches within the active full bridges, a power pulsating buffer (PPB) configured to reduce capacitor requirements on the DC port, and an unfolder stage to convert rectified AC voltage to a pure sine wave. The centralized controller may optimize performance by varying at least one of a switching frequency, a duty cycle of bridge voltages, and a phase shift between bridge voltages. The PPB may include a buck active power decoupler with a half-bridge, inductor, and capacitors, and also a primary full bridge and a power transfer impedance block.

The invention discloses a passive gasket type pressure sensor based on parametric negative resistance self-excitation and a monitoring method, and belongs to the technical field of bolt loosening state monitoring. The sensor is improved based on a standard metal flat washer, a piezoelectric sensing unit, a pilot frequency response passive network and a passive heat-induced drift suppression circuit are embedded, and an embedding area is filled with organic silica gel. The pilot frequency response passive network uses parametric reactance to modulate nuclear strength nonlinearity to generate active negative resistance, weak radio frequency energy self-excitation is achieved, and bolt axial load change is mapped into echo frequency sideband drift; the thermally induced drift suppression circuit eliminates temperature drift. According to monitoring, the environment temperature is determined through temperature echoes, a frequency-load curve is matched, and then the bolt loosening state is determined through bolt loosening state echoes. Passive, wireless, maintenance-free and high-precision monitoring is realized, and the problems of high starting threshold, near communication, poor integration and the like in the prior art are solved.

A device comprises an input stage, a signal distribution network comprising a plurality of passive elements, and a plurality of output stages coupled to the signal distribution network. The input stage is configured to drive a signal onto the signal distribution network. The signal distribution network is configured to distribute the signal to the plurality of output stages. Each output stage of the plurality of output stages comprises a variable resistance element and a variable reactance element, for tuning a complex input impedance of the output stage to obtain a signal transfer characteristic for transferring the signal from the input stage to the output stage over the signal distribution network.

A data canceler is disclosed herein. The data canceler includes a first inverter circuit. The first inverter circuit is configured to generate a first inverted data signal based on an inversion of a first unwanted data signal supplied via a first input terminal of a data transmission network. The data canceler includes a passive network comprising a plurality of passive components arranged between an output terminal of the transmission network and an output of the first inverter circuit. The passive network is configured to receive, via the output terminal of the transmission network, a mixed data signal comprising a target data signal and the first unwanted data signal, and further combine the first inverted data signal and the mixed data signal across the passive components to cancel the first unwanted data signal in the mixed data signal.

The present invention discloses a method, system and computer program for characterising geographic areas. The method comprises accessing user data from a mobile network operator, said data being associated with active and / or passive network events from the connections established between user mobile devices and mobile network operator towers; calculating a set of user parameters using said accessed data, the calculation of the parameters comprising: calculating a visit parameter, calculating points of interest of each user, and obtaining web browsing data from mobile devices based on obtaining network traffic from each device in the network; and determining a characterisation profile of a geographic area by calculating a socio-demographic profile of the temporary and permanent resident users in said geographic area.

The invention relates to the technical field of construction site safety monitoring and Internet of Things, and discloses an automatic alarm safety helmet which comprises a safety helmet body, an integrated module and a lower jaw belt are detachably installed on the safety helmet body, and a resistance sensor and a reference capacitor assembly which are used for making contact with the skin of a wearer are packaged in the lower jaw belt. The resistance inductor and the reference capacitor assembly are connected to form a passive network of an RC oscillation detection loop, and a chip, a WiFi module, a buzzer, a power supply, a signal excitation source and a frequency meter are arranged in the integrated module. According to the invention, the reference capacitor assembly is implanted in the mandibular belt and the RC oscillation detection loop is constructed, and the wearing judgment is carried out by using the characteristic that the oscillation frequency is changed after the human skin resistor is connected to the circuit, so that the problem of cheating caused by the pressing of a heavy object or the short circuit of a lead in the prior art is effectively solved, and the monitoring accuracy and the anti-cheating capability are improved.

Systems, apparatus, processes, and computer readable media for wireless communication are disclosed. For example, a passive network device can receive an orthogonal frequency division multiplexing (OFDM) signal from a network device. The passive network device can transmit a backscatter signal based on the OFDM signal, the backscatter signal including frequencies of the OFDM signal shifted to non-overlapping frequencies.

This invention discloses an asymmetric nonlinear temperature-compensated attenuator and its design method, belonging to the field of electronic circuit technology. Specifically, it is based on a T-type or π-type two-port attenuation network design. The series and parallel arms are selected from parallel or series equivalent resistance units, and the series and parallel arms of the same type of two-port attenuation network are different. The parallel equivalent resistance unit consists of a first PTC thermistor, a first NTC thermistor, and a first fixed resistor connected in parallel. The series equivalent resistance unit consists of a second PTC thermistor, a second NTC thermistor, and a second fixed resistor. The second NTC thermistor is connected in parallel with the second fixed resistor, and then connected in series with the second PTC thermistor. This invention achieves accurate mirror fitting of non-monotonic temperature characteristics in a passive network by constructing equivalent resistance units with extreme points, flexibly adapting to various asymmetric nonlinear curves.

The invention discloses an SPICE model generation method considering passive network thermal noise, and the method comprises the steps: carrying out the modeling of a multi-port passive network S parameter through employing a passive macro-modeling algorithm, obtaining a passive state space model, constructing a Riccati equation, solving the Riccati equation, obtaining a state space model of a lossless network, employing a state space-based SPICE model generation method, carrying out the solving of a Riccati equation, and carrying out the calculation of the Riccati equation. And obtaining an equivalent SPICE circuit model, and carrying out joint simulation by utilizing the SPICE circuit model and other modules in the circuit to obtain an analysis result of field-circuit co-simulation. According to the method, a state space model for representing an original system is decomposed into a lossless network and a pure resistance network, wherein the lossless network only considers the transmission characteristics of a passive network and can be synthesized by using a noiseless model device; and the pure resistance network is used for equivalent thermal noise generated by the passive network, so that the accuracy of a result in simulation related to noise analysis is ensured to be kept.

The present application relates to the technical field of passive Internet of Things, and provides a passive network system configuration method and apparatus, an electronic device, a storage medium, and a computer program product. The method comprises: obtaining first information, wherein the first information is used for representing at least one of service requirement information, state information of a network device and configuration information of a passive device; performing analysis on the basis of the first information and multi-type configuration constraints for the passive device, and determining target configuration information of a passive network, wherein the target configuration information meets the service requirement information and the configuration constraints.

This invention relates to the field of electronic circuit technology, specifically to a passive network structure for suppressing the influence of inductor self-resonance. The structure includes: a large inductor with a resistor connected in parallel across its terminals and a small inductor connected in series; the resistor is used to dissipate resonant energy, and the small inductor is used to adjust the resonant frequency; the large inductor, resistor, and small inductor are sequentially connected via a connection structure; the connection structure includes a first connection structure and a second connection structure; the first connection structure connects the large inductor and the resistor, and the second connection structure connects the large inductor and the small inductor. This invention features a simple structure, low power consumption, and strong adaptability, making it suitable for high-frequency communication, power supply filtering, and other applications requiring high inductor performance.

The invention discloses a passive auxiliary soft switching power amplifier based on hybrid ZVS (Zero Voltage Switching) / ZCS (Zero Voltage Switching). The passive auxiliary soft switching power amplifier comprises a double-direct-current voltage module, a double-resonant capacitor and resonant inductor passive soft switching network, a midpoint double-path parallel bridge arm, a double-switching tube high-frequency main power output bridge arm, a double-parallel auxiliary capacitor and an LC filtering output network. The passive auxiliary device adopted by the invention is simple, an additional auxiliary switch tube and a driving module are not needed, and the control complexity is greatly reduced; the design that the resonant inductor is connected in series with the midpoint bridge arm avoids the direct connection risk of the bridge arm fundamentally, dead time does not need to be set, and the operation reliability is improved; meanwhile, a hardware condition is created for realizing hybrid ZVS / ZCS for the full-switching tube, so that the switching loss is reduced, the heat loss of the whole machine is reduced due to the low-loss characteristic of the passive network, the heat dissipation design can be simplified, and the service life of the device can be prolonged; and the network structure is simple, small in size and easy to integrate.

This application discloses a passive network asset discovery method and apparatus. The method includes: connecting raw network traffic to the Suricata network threat detection engine, generating a target data stream through the Suricata network threat detection engine, processing the network layer data stream based on a PoF fingerprinting tool to extract network layer fingerprint information, simultaneously processing the application layer data stream based on the Suricata network threat detection engine to extract application layer fingerprint information, and generating an asset discovery result based on the network layer fingerprint information, application layer fingerprint information, other fingerprint information, and fingerprint matching confidence. This solution embeds PoF's passive asset identification capability into the Suricata processing pipeline as a dynamic library, fully utilizing Suricata's high-performance traffic processing and application parsing and identification capabilities to improve the performance and accuracy of asset discovery; and it uses a completely passive approach to discover assets, without generating any probe traffic, thus not affecting the network or business systems.

A data canceler is disclosed herein. The data canceler includes a first inverter circuit. The first inverter circuit is configured to generate a first inverted data signal based on an inversion of a first unwanted data signal supplied via a first input terminal of a data transmission network. The data canceler includes a passive network comprising a plurality of passive components arranged between an output terminal of the transmission network and an output of the first inverter circuit. The passive network is configured to receive, via the output terminal of the transmission network, a mixed data signal comprising a target data signal and the first unwanted data signal, and further combine the first inverted data signal and the mixed data signal across the passive components to cancel the first unwanted data signal in the mixed data signal.

The invention relates to the technical field of indoor distribution positioning, and provides a method, device and equipment for positioning the position of a terminal in a building and a medium, and the method comprises the steps: obtaining the installation position of an antenna in the building and the number of the antenna; determining a passive network architecture comprising a passive cell, a base station main cell configuration module and a passive data processing module; the base station main cell configuration module configures relation information, wherein the relation information comprises a one-to-one corresponding relation between an antenna number and a passive cell identifier and a one-to-many corresponding relation between a main cell and a passive cell; and the passive data processing module matches the unique corresponding relation data of the terminal and the passive cell according to the relation information and the measurement report data reported by the terminal so as to determine the position of the terminal in the building. According to the invention, a new passive network architecture and a measurement report data acquisition mechanism are adopted, so that the home location of the terminal position in an indoor distribution multi-antenna scene can be accurately realized; and the whole network architecture is flexible to deploy and simple to operate.

To provide a self-oscillating Class-D amplifier device which implements the improvement of acoustic performance, the reduction of distortion and the improvement of stability.SOLUTION: An amplifier device 300 for amplifying an input signal Sx at a device input X to an output signal Sy at a device output Y, for driving reactive load such as a loudspeaker, comprises a self-oscillating Class-D power amplifier stage K with transfer function KA(s). The amplifier stage includes a comparator, a power stage, a second-order low-pass output filter and a time delay unit. The time delay unit provides a delay determined by the comparator, the power stage, and a first feedback filter Hosc. The output signal Sy is fed back to the comparator via a first feedback path. A correction stage comprises a second feedback path that feeds the output signal Sy to a virtual ground input of a transimpedance amplifier. A third feedback path for further enhancing correction includes a passive network which applies a first transfer function H2 to the output signal Sy and applies a second transfer function H3 to the input signal Sx.SELECTED DRAWING: Figure 2

The utility model provides an engineering special vehicle MCU rapid reset control circuit and a power management system. The engineering special vehicle MCU rapid reset control circuit comprises a micro-control unit and a reset control module. The reset control module comprises a power-on reset sub-module and a power-off reset sub-module; the power-on reset sub-module outputs a reset signal to a chip reset signal end when the micro-control unit is powered on; the power-off reset sub-module adopts the combination of a rapid reset chip and a divider resistor, the input end of the rapid reset chip is connected with an external power supply, and the output end is connected to a chip reset signal end through the divider resistor. According to the circuit, a traditional passive RC network reset mechanism is replaced by the rapid reset chip, the problem of MCU reset abnormity caused by frequent ignition start and flameout turn-off of the engineering special vehicle is effectively solved, it is ensured that when the voltage drops to a preset threshold value, the rapid reset chip can rapidly recognize and output a low level to the MCU, sufficient time is provided for the MCU to complete a complete reset process, and the reliability of the MCU is improved. Therefore, continuous and stable operation of the MCU is ensured.

The application discloses a passive gasket type pressure sensor based on parametric negative resistance self-excitation and a monitoring method, and belongs to the technical field of bolt loosening state monitoring. The sensor is improved based on a standard metal flat gasket, and a piezoelectric sensing unit, an out-of-frequency response passive network and a passive thermal-induced drift suppression circuit are embedded in the improved sensor. The embedded area is filled with organic silicone glue. The out-of-frequency response passive network utilizes parametric reactance modulation to generate active negative resistance through strong nonlinearity, realizes self-excitation of weak radio frequency energy, maps bolt axial load changes into echo frequency sideband drift, and the thermal-induced drift suppression circuit eliminates temperature drift. The monitoring further determines the environmental temperature through the temperature echo, matches the frequency-load curve, and then determines the bolt loosening state through the bolt loosening state echo. The application realizes passive wireless, maintenance-free and high-precision monitoring, and solves the problems of high starting threshold, short communication distance and poor integration of the prior art.

The application belongs to the technical field of power electronic real-time simulation, and aims at the problems of insufficient simulation accuracy of traditional pure CPU simulation, limited simulation scale of FPGA simulation, communication bottleneck and poor flexibility of "CPU+FPGA" hybrid simulation, and proposes a power electronic converter small step real-time simulation method and system. The core is to build a multi-port equivalent model based on the switching function method or the improved node method, and to equivalent the nonlinear part of the converter into a controlled source and fuse the linear passive network; adopt the "CPU unique calculation + FPGA special communication" architecture, FPGA nanosecond level acquisition PWM pulse sequence transmission to CPU, CPU through the main step nesting small step recursive calculation, in the microsecond level main step, reproduce the hundred nanosecond level electrical dynamic. The matching special system deeply optimizes the CPU multi-core parallel ability, the communication cost is low, realizes the accuracy, the efficiency and the scale unification, the cost is low, the flexibility is high, can support the large-scale high switching frequency system high precision simulation, is applicable to the new energy grid connection, direct current transmission and other scenes.

This invention relates to a passive network anomaly monitoring and automated UAV inspection method and system, belonging to the field of intelligent operation and maintenance technology for transportation infrastructure. The method includes steps S1, anomaly perception and identification; step S2, UAV path generation; step S3, UAV inspection and target data acquisition; step S4, damage assessment report generation; and step S5, condition-based maintenance decision-making. This invention achieves high-precision passive network identification with extremely low power consumption, solving the problem of insufficient capture of anomaly features in flexible structures by existing SHM (Survey-Synchronous Mapping) technology. Based on digital twin and reinforcement learning technologies, it enables UAVs to complete path planning and autonomous takeoff within seconds of an event occurring, overcoming the shortcomings of existing UAVs' periodic rather than event-triggered inspections and low recognition rates, thus improving the processing efficiency of passive network anomaly events.

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, a passive network device can receive, from a network device, an orthogonal frequency division multiplexing (OFDM) signal. The passive network device can transmit, based on the OFDM signal, a backscatter signal comprising a frequency of the OFDM signal shifted to a non-overlapping frequency.

Wireless circuitry is provided that includes a radio-frequency amplifier and a passive network coupled to the radio-frequency amplifier. The passive network includes a primary coil, a secondary coil magnetically coupled to the primary coil, and a harmonic rejection component coupled between the primary coil and the secondary coil and configured to reject harmonic signals produced by the radio-frequency amplifier. The harmonic rejection component can be a capacitor. The harmonic rejection component can be configured to operate as an open circuit at a first frequency and can further be configured to resonate with a portion of the secondary coil at a second frequency different than the first frequency.

The invention relates to the field of electric power communication networks, in particular to a distributed photovoltaic communication resource dynamic optimization method based on business situation awareness, which comprises the following steps: constructing a system state vector fusing communication performance data and electric power business semantic information; adopting a multi-objective optimization algorithm to generate a plurality of strategy candidate sets; arbitrating an optimal strategy from the strategy candidate set through a dynamic rule engine; rehearsing the optimal strategy in a digital twinborn simulation environment, and executing to a real communication network if a core constraint is met and the health degree of the system is not deteriorated; and after execution, collecting a real system state, comparing a rehearsal predicted value with a real value, and if a prediction deviation continuously occurs, automatically and finely adjusting a threshold parameter in the dynamic rule engine to realize system self-evolution. According to the invention, an intelligent closed-loop management normal form of'perception-decision-rehearsal-execution-learning 'is constructed, so that the crossing from passive network monitoring to active service guarantee is realized.

The invention discloses a digital program control dispatcher with a hierarchical impedance self-healing function and a control method, and the dispatcher comprises a business board which is provided with a mixed impedance self-adaptive matching circuit which is connected in series between a port driving chip and an external physical interface. The circuit is formed by connecting a passive self-adaptive matching unit close to an interface side and a digital control matching unit close to a driving side in series. The passive unit is used for performing nanosecond instantaneous passive matching on load impedance abrupt change based on a nonlinear transmission line principle; the digital unit carries out injection detection, analysis modeling and control of a programmable passive network, and carries out precise matching on slow-changing impedance. And through cooperation of the two, full-time-domain and high-precision impedance self-adaption from instant to long term is realized. According to the invention, the problem that the response speed, the matching precision, the reliability and the cost are difficult to consider at the same time in the prior art is solved, and the signal integrity, the equipment reliability and the economical efficiency of the communication port in a complex environment are remarkably improved.

The invention discloses a nonlinear suspension system fractional order decoupling sliding mode control method and system, and the method comprises the steps: building a system state space model for a nonlinear suspension system with uncertain parameters and an actuator easy to break down; a passive mechanical network controller, an interference observer based on fractional order switching and a fractional order decoupling sliding mode controller are designed in sequence, and a passive and active cooperative composite control architecture is formed. Wherein the fractional order disturbance observer can estimate the uncertainty of the system with high precision, and the decoupling sliding mode controller respectively coordinates and controls the sprung mass subsystem and the unsprung mass subsystem through an independently designed sliding mode surface. According to the method, the comprehensive performance of the vehicle suspension under various working conditions is remarkably improved, the basic control capacity is kept by means of the passive network when the actuator breaks down, and the method has the advantages of being excellent, robust and practical in engineering.

A method includes determining, by a computer processor, a set of optimal active device parameters for an active device of an integrated circuit using an optimization engine, a first machine-learning model, and a set of target circuit performance metrics; determining, by the computer processor, a set of optimal passive network parameters for a passive network of the integrated circuit using the optimization engine, a second machine-learning model, and the set of target circuit performance metrics; and generating, by the computer processor, a circuit design for the integrated circuit based on the set of optimal active device parameters and the set of optimal passive network parameters.

Certain aspects of the present disclosure provide techniques for uplink and / or downlink communication synchronization. A method generally includes receiving a first preamble in one or more first symbols; transmitting a first backscatter signal to the network entity based on the first preamble; and transmitting a carrier-based second backscatter signal to the network entity in one or more second symbols, the second backscatter signal comprising a second preamble, the second backscatter signal being transmitted in response to receiving the first preamble, wherein the one or more second symbols are offset in time relative to the one or more first symbols based on a timing offset configured at the device and a timing error offset of the device, and the second preamble is configured for synchronization of uplink communications between the device and the network entity.

Methods, systems, and devices for wireless communications are described. The described techniques support decoupled uplink and downlink communications via reconfigurable intelligent surfaces. Generally, the described techniques provide for using different passive network nodes for uplink and downlink communications. A user equipment (UE) may receive, from a base station, an indication of a first transmission configuration indicator state for downlink communications with the base station and a second transmission configuration indicator state for uplink communications with the base station. The UE may receive, from the base station via a first passive device (e.g., a first reconfigurable intelligent surface (RIS)) associated with the first transmission configuration indicator state, a downlink message in a radio frame. The UE may transmit, to the base station via a second passive device (e.g., a second RIS) associated with the second transmission configuration indicator state, an uplink message in the radio frame.

This invention belongs to the field of integrated circuit technology, specifically a phase shifter based on two-dimensional wafer-level materials. The phase shifter of this invention consists of N cascaded phase shifting units, each corresponding to a specific phase weight. Each phase shifting unit comprises two parts: a radio frequency (RF) switching transistor fabricated based on wafer-level two-dimensional semiconductor materials, and a passive phase shifting network composed of on-chip inductors and capacitors. The switching phase shifter adopts a switching topology, introducing a specific phase delay in the RF signal path by controlling the on and off states of the RF switch to switch different passive network branches. By cascading multiple phase shifting units, a phase resolution of up to N bits can be achieved, ensuring high-precision phase control. This invention provides crucial beamforming support for electronic systems such as phased array radar and satellite communications, and has broad application prospects.

The application discloses a kind of based on passive network type inverter station distributed collaborative control method, belong to electrical engineering field.The distributed collaborative control method is designed to the inner loop controller of network type inverter by using port controlled Hamilton method, and the stability of new energy station is guaranteed by introducing nonlinear observer, in addition, the ideal injection damping parameters of each network type inverter under different power grid states are determined by using pole placement method, and the dynamic performance of network type inverter station is improved.The application is not only simple to implement, but also solves the problem that the overall dynamic performance of the station is difficult to be considered under the traditional passive control of the inverters in the network type inverter station scene with multiple inverters, effectively improving the dynamic performance of the inverter station under complex power grid changes.