387 results about "Switching time" patented technology

The invention provides an HPLC (High Performance Liquid Chromatography) station area cooperative communication method based on clock synchronization, which comprises the following steps: step 1, multi-dimensional data acquisition and broadcasting: each concentrator periodically acquires clock precision, stability and reliability data, and sends a beacon frame containing a timestamp and a health degree score through a power line carrier broadcasting channel; step 2, dynamically calculating the index distinction degree by using an entropy weight method, adaptively allocating weights, and electing an optimal main CCO in real time; step 3, dual-mode PID cooperative control: the main CCO adopts a dual-mode switching strategy of a dynamic PID algorithm and a chaotic fractional order PID algorithm; 4, monitoring a synchronization state in real time by constructing a clock check network, and optimizing a fault isolation strategy in combination with weighted scoring to realize that the state switching time of the master node and the slave node is less than or equal to 50ms; cooperative communication is realized on the basis of completing synchronization of the concentrators CCO in the whole network. Redundant message transmission is reduced through a dynamic parameter resynchronization mechanism, and the utilization rate of network resources is optimized.

The invention discloses a method for switching between a first communication mode and a second communication mode, and the method comprises the steps: determining a dual-mode phase difference between a first mode baseband signal and a second mode parameter based on the first mode baseband signal and the second mode parameter; generating an interleaved phase coding sequence in response to the dual-mode phase difference; pre-modulating the first mode signal in parallel before switching by using the coding sequence, and generating a pre-activated second mode virtual signal; switching from the first mode to the second mode is executed based on a parallel fusion phase track generated after the phases of the two preprocessed signals are subjected to time-varying weighted fusion. According to the method, a smooth switching track is constructed through parallel phase preview and phase domain fusion, phase continuity and frequency stability in the switching process are ensured, switching time delay and the data error rate are remarkably reduced, and the communication service quality of the heterogeneous network is improved.

The invention discloses a time division duplex multi-carrier synchronous transmission method based on 5G, which relates to the technical field of communication, and comprises the following steps of: establishing a carrier mapping table, respectively mapping a plurality of logic carriers to predefined physical resource blocks, and marking uplink and downlink switching time slots according to a time division mode; after a user terminal receives a synchronization signal, alignment is carried out through a high-precision local clock and the reference time of a main base station, and a synchronization reference point is recorded with a nanosecond-level time resolution. According to the invention, through the dynamic synchronization control and frequency domain interference suppression technology, the synchronization stability and the data transmission reliability in a high-speed scene are significantly improved; a synchronous load scoring mechanism is introduced to realize efficient scheduling and conflict avoidance of synchronous resources in a multi-user concurrent environment; and in combination with interference weight estimation and an adaptive filtering strategy, the anti-interference capability and environment adaptability of the system are effectively enhanced, and the requirements of key services such as the Internet of Vehicles and industrial control on low-delay and high-reliability communication are comprehensively met.

The invention discloses a standby power supply intelligent monitoring and switching control system and method based on the Internet of Things, and relates to the technical field of standby power supply intelligent switching, and the method comprises the following steps: setting an optimal reference switching time threshold in combination with the historical operation data, load characteristics and technical specifications of standby power supply switching; an initial secure handover period is defined. According to the invention, the key jump from timed switching to state sensing driving switching is realized, so that the system can comprehensively sense the phase synchronization state between the main power supply and the standby power supply before switching, and the phase jump trend is dynamically predicted and intelligently judged in combination with a machine learning model; therefore, impact current, equipment damage and regional tripping risks caused by forced switching due to inconsistent phases are effectively avoided, and the safety, the accuracy and the intelligent level of the switching process of the standby power supply are remarkably improved.

The invention provides a mainboard power supply output voltage stability test method and system, and the method comprises the steps: generating a dynamic stepped load current based on a load demand parameter and a limit working condition defined by a hardware specification when a mainboard operates in a preset multi-mode switching state, and setting a first synchronization window before each step switching moment, setting a second synchronization window after the step switching time, collecting voltage waveform data, inputting the voltage waveform data into a preset filtering algorithm, extracting an overshoot amplitude and recovery time, constructing an asymmetric coupling model, and taking a difference value between the overshoot amplitude and a preset fluctuation range as a first stability index; the ratio of the recovery time to the response time threshold value is used as a second stability index, nonlinear weight distribution of the two indexes in multiple step intervals is calculated, a stability grade judgment result is generated in combination with a circuit board wiring impedance characteristic library, and the test compatibility of high-density mainboard multi-phase power supply and high-frequency devices is improved.

The invention discloses a communication method, device and system and a storage medium, relates to the technical field of communication, and can ensure that all non-AP stations compete for a new TXOP at the same time after the TXOP is finished, and keep medium synchronization. The method comprises the following steps: a non-AP station obtains switching time indication information, and switches from a first channel to a second channel comprising a main 20MHz channel based on the switching time indication information. Wherein the first channel and the second channel are not overlapped, and the switching time is not later than the first time. The first moment is the latest moment when the non-AP station is switched from the first channel to the second channel. The first channel comprises one or more 20MHz channels used for communication between the non-AP station and the AP station in the current TXOP.

The invention discloses a function switching device for transformer testing and a testing system thereof, relates to the technical field of transformer testing, is used for solving the problem of low testing efficiency, and is used for setting a switching time reference by acquiring transformer capacity information and detecting the number of closed relays of testing nodes and loop resistance. Analyzing a resistance fluctuation index and loop harmonic characteristics by combining historical loop resistance data, correcting a switching time reference, detecting three-phase winding current, generating a current balance index, evaluating a fault risk level, screening and marking to-be-tested nodes according to the fault risk level, and after the current test node is tested, determining the current test node according to the fault risk level. And performing test processing on the marked to-be-tested nodes based on the corrected switching time reference, thereby realizing intelligent selection of a transformer test sequence, improving test efficiency and ensuring electrical state stability and test precision of each test node.

The invention relates to the technical field of keyboard pairing, and discloses a keyboard multimode pairing method and device, equipment and a storage medium. The method comprises the following steps: establishing a switching time calculation model of a keyboard according to the reference switching time of keyboard hardware, a protocol node cooperation coefficient, an equipment response weight coefficient and a pre-connection optimization coefficient; calculating the theoretical optimal switching time of the current switching scene; selecting a working mode of single-node direct switching, double-node pre-connection or three-node parallel pre-connection of a keyboard Bluetooth node, a 2.4 GHz node and a USB node; activating a corresponding communication node, sending a connection handshake signal to the target equipment and establishing a communication link pre-connection state; and switching keyboard input and output from the current equipment to the target equipment to finish quick connection switching between the equipment. According to the invention, a pre-connection mechanism is adopted, the target equipment connection is established in advance before the user completes the switching instruction, passive response switching is converted into active prediction switching, and instantaneous equipment switching is realized.

The invention discloses an OEO amplifier with a high-speed hard switching function and an optical transmission system, and relates to the technical field of optical amplifiers, the OEO amplifier comprises three magneto-optical switches, an optical splitter group, a photoelectric detector group, a real-time comparison circuit, a logic gate control circuit and a driving circuit; the photoelectric detector group collects optical signal power to generate an electric signal; the real-time comparison circuit performs voltage threshold judgment on the electric signal; the logic gate control circuit is connected with the output end of the real-time comparison circuit so as to synchronously control the switching states of the three magneto-optical switches according to a voltage threshold judgment result; the driving circuit is used for driving the magneto-optical switch to synchronously execute a switching action; when the OEO amplifier detects that optical signals in any direction are interrupted, all the magneto-optical switches finish synchronous switching within 100 microseconds, and the end-to-end optical signal switching time difference is smaller than 2 picoseconds. The method is suitable for a single-fiber bidirectional optical communication environment requiring high frequency, high precision and high stability.

The invention provides an uninterrupted redundant communication method and system, equipment and a medium, and belongs to the technical field of vehicle-mounted network communication.The method comprises the steps that data frames from two communication paths are received through two network interfaces respectively, CRC verification is carried out, wrong data frames are discarded, and the data frames passing verification are obtained; extracting the serial number of each data frame passing the verification as a target serial number, and comparing the target serial number with an expected serial number; if the target serial number is equal to the expected serial number, submitting the data frame to an upper application, and adding 1 to the expected serial number; wherein the data frame is generated by adding a globally unique and monotonically increasing serial number to each key application data frame by the sending end processing unit. According to the invention, fault switching delay is eliminated fundamentally, zero switching time is realized, and a crucial communication guarantee is provided for automatic driving of L4 and above.

The disclosure concerns a control method for operating a multi-phase converter with a number N of phases, N being at least three, said converter including a transformer, a primary side circuit which includes primary switch legs with primary switches connected to a primary side of the transformer, and a secondary side circuit which includes secondary switch legs each with at least one secondary switch connected to a secondary side of the transformer, the method including: a boost operation mode including a shorting step of shorting the secondary side circuit by controlling a plurality of secondary switches of separate secondary switch legs to be simultaneously ON, said shorting step is repeated periodically within one switching time period T; and / or a phase-modification operation mode including a phase-reduction step of reducing an operating phase of said converter by controlling all primary switches of at least one primary switch leg to be simultaneously OFF.

The invention discloses a heterogeneous device hybrid ANPC converter junction temperature equalization method. The method comprises the following steps: S1, optimizing junction temperatures among ANPC devices; s2, if the maximum junction temperature appears in the hybrid device, entering S3; s3, optimizing the internal junction temperature of the hybrid device; the PWM rotation strategy of the ANPC converter and the hybrid device switch time sequence switching strategy are combined, the junction temperature between devices is relatively balanced by adjusting the switch loss distribution of the converter, the power output capacity of the converter is improved, and it is guaranteed that the converter can operate safely and reliably under different working conditions.

The invention discloses a high-speed fixed-point multiplication circuit. The multiplication circuit is mainly composed of a multiplier coding module, a partial product generation module, a partial product compression module and a traveling wave carry adder module. The multiplier coding module is composed of a radix-4-Booth coding algorithm and an opposite number generation module, and is used for carrying out three-bit block coding on input multiplication data and generating an opposite number of a multiplicand in advance. The partial product generation module generates a plurality of groups of partial products with symbol extension according to the multiplicand coded signal. And the partial product compression module adopts an improved Wallace compression structure to perform layered compression on the partial product. And the traveling wave carry adder module sums the two groups of results output by compression and outputs a multiplication result. According to the invention, multiplication accumulation series can be reduced, the switching times of invalid signals in the circuit can be reduced, and the longest delay path in an operation link can be shortened, so that fixed-point multiplication which is high in speed, low in power consumption and more favorable for a comprehensive tool in structure is realized.

The invention relates to a scale out network backup path fast switching notification system and method, and aims to solve the problem that the existing VRRP / BFD protocol switching time cannot meet the high real-time requirement of an AI server scale out network. The scheme is realized through a collaborative architecture of a CPU (Central Processing Unit), an inspection FPGA (Field Programmable Gate Array) and power supply monitoring: the CPU runs a VRRP / BFD (Bidirectional Forwarding Detection) protocol stack and maintains a state table, and the FPGA is responsible for detecting a power supply fault, a port fault and GPU alarm in real time, and generating and sending a pre-installed message in one main frequency period; and the power supply monitoring module ensures that power supply is maintained for more than or equal to 5ms after sudden power failure through the energy storage capacitor, so that complete transmission of fault messages is ensured. The system has the advantages that the system supports multi-scale out interface redundancy, the end-to-end delay of fault detection and backup path switching is smaller than or equal to 1ms by adopting a low-power-consumption switching chip and independent minimum power domain design, the fault response speed and reliability of an AI server scale out network are remarkably improved, and the system is suitable for guaranteeing the network continuity of a high-density AI training cluster.

A station (STA) includes a memory and a processor, the processor to cause receive, a frame associated with initiating a non-primary channel access (NPCA) operation from an access point (AP) that supports NPCA operation, the frame indicating a NPCA primary channel that the AP and the STA switch to for the NPCA operation. The processor is further to cause switching, at a switch time, from a basis service set (BSS) primary channel to the NPCA primary channel based at least in part on receiving the frame. The processor is further to cause initiating a transmission on the NPCA primary channel based on an enhanced distributed channel access (EDCA) parameters associated with the NPCA primary channel. The processor is further to cause an end of transmission on the NPCA primary channel and to cause switching to the BSS primary channel.

The invention provides a signal conditioning circuit, an analog-to-digital conversion system and a gain adjusting method and device, and belongs to the technical field of analog-to-digital conversion. The signal conditioning circuit comprises a switching module and a plurality of signal conditioning modules, and each signal conditioning module is connected with the switching module. The switching module is used for switching the signal conditioning modules connected with the analog-to-digital converter in the analog-to-digital conversion system according to the switching instruction, so that during each analog-to-digital conversion, only one signal conditioning module is used as a working signal conditioning module to be connected with the analog-to-digital converter; the switching instruction is generated according to a prediction gain gear and a prediction signal; the signal conditioning module is used for acquiring a to-be-converted signal, adjusting the to-be-converted signal to obtain an adjusted signal, and inputting the adjusted signal to the analog-to-digital converter for analog-to-digital conversion. The working signal conditioning module is switched through the switching module, the switching time is shortened, data availability in the sampling process is guaranteed, and therefore the conversion precision is improved.

The invention provides a 2M non-framing double-path protection intelligent switching method and system based on redundancy check, and relates to the technical field of communication, and the method comprises the steps: obtaining double-path 2M non-framing code streams, carrying out the alignment processing, generating a check result through employing cyclic redundancy check, carrying out the statistics of error code feature vectors in a sliding time window, and constructing a link quality track. According to the method, the quality degradation early warning signal is extracted, the stage switching strategy is constructed based on the early warning signal, the switching time sequence is determined in combination with the neural network evaluator, link switching is executed, self-adaptive optimization of the switching strategy is achieved, and the intelligence and reliability of link switching are improved.

The invention belongs to the technical field of motor control, and discloses a control method for switching an open loop to a closed loop of a permanent magnet synchronous motor, which is used for switching the permanent magnet synchronous motor from speed loop open-loop operation to rotating speed current double-closed-loop operation. Calculating an included angle delta between the shafting of the virtual synchronous rotating coordinate system dvirqvir and the shafting of the real rotor synchronous coordinate system dq; and then instantaneous switching of a command value of a current regulator, instantaneous switching of a current space voltage vector, switching of an angle variable used by coordinate transformation, initialization of a previous value of a low-pass filter, initialization of an integral term of the current regulator and initialization of an integral term of a speed regulator are executed in sequence, and open-loop switching and closed-loop switching of the permanent magnet synchronous motor are completed. According to the invention, the switching time is effectively shortened, and the switching stability and universality are improved.

The invention discloses a method and system for testing electromagnetic radiation characteristics of an IGBT module for a converter valve, and the method comprises the steps: selecting an inductive load connection mode according to the position of an IGBT to be tested during testing: testing an upper IGBT, and connecting the two ends of an inductive load with a first wiring terminal and a second wiring terminal (the first wiring terminal is a neutral point between the upper IGBT and a lower IGBT) of the converter valve; and when the lower tube IGBT is tested, the first wiring terminal and the positive terminal of the bus capacitor are connected. A combined electromagnetic field probe is arranged around the IGBT to be detected, a probe shell is grounded, and a lead is connected with a signal conversion device. Firstly, a bus capacitor is charged to a stable voltage, and environmental background noise is collected by a probe when no gate pole is triggered. And pulse parameters are set by the upper computer and are sent to the driving board through the optical fiber to trigger the IGBT double-pulse action. Electric signals output by the probe are converted into optical signals through the photoelectric converter and transmitted to external equipment through the optical fiber to be restored. And subtracting background noise from a double-pulse measurement result, extracting a net radiation electromagnetic signal, and separating electromagnetic interference signals in different processes according to the switching time of the IGBT. The invention aims to accurately measure the radiation electromagnetic interference signal of the IGBT in the converter valve module in the switching-on, switching-off and diode follow current processes, and provides a basis for the electromagnetic compatibility design and shielding reinforcement of the converter valve module.

The invention relates to a trigger unit. The trigger unit comprises a first comparison feedback circuit, a first clock gating circuit, a master latch and a slave latch assembly, the first comparison feedback circuit is used for detecting a signal hopping state of an external input signal according to a first output signal output by the output end of the main latch, and generating a corresponding first state feedback signal, so that the first clock gating circuit generates a corresponding first gating clock signal according to the first state feedback signal and a reference clock signal, and sends the first gating clock signal to the second clock gating circuit; under the condition that the first gating clock signal is valid, the main latch is controlled to update the first output signal according to the external input signal; the state switching opportunity of the main latch can be accurately controlled, and unnecessary clock flipping in the trigger and transistor switching activity caused by the unnecessary clock flipping are effectively reduced, so that dynamic power consumption related to a clock network and dynamic power consumption generated by flipping of nodes in a data path are effectively reduced.

The invention relates to the technical field of data processing, and discloses a multi-network-port dynamic redundancy switching method and system for an ARM master controller. The method comprises the following steps: acquiring a network state through an ARM master controller hardware counter to construct a four-dimensional vector, performing dimension decoupling distribution by using a heterogeneous multi-core architecture, predicting the state of each dimension by using an NEON instruction set parallel Kalman filtering algorithm, obtaining a comprehensive prediction result and a confidence interval through a covariance cross fusion mechanism, and determining the state of each dimension according to the comprehensive prediction result and the confidence interval. And realizing predictive network interface switching based on a dynamic event triggering mechanism of a confidence interval. According to the method and the device, the technical problems of long switching time delay, poor judgment accuracy and lack of predictive switching capability in the existing ARM master controller multi-network-port redundancy switching method are solved.

The invention discloses a multi-mode electric energy conversion system and a method thereof, and relates to the technical field of power electronic conversion, the system comprises a signal acquisition module, a mode discrimination module, a soft switching control module and a switching execution module, the signal acquisition module acquires an input voltage, an output voltage, a load current and a switching tube temperature signal; the mode judgment module determines a target working mode according to an input voltage interval and a load rate interval, dynamic switching among a full-bridge phase shift mode, a half-bridge mode and an interleaving parallel mode is achieved, the soft switching control module generates a soft switching time sequence signal, a main power switch tube is enabled to achieve zero-voltage switching, and the main power switch tube is enabled to achieve zero-voltage switching. The switching execution module adopts a current ramp control strategy to execute mode switching, the switching time is less than 5ms, the voltage fluctuation is less than 3%, and the global efficiency is greater than 95% and the peak efficiency is greater than 98% under the conditions of wide voltage and wide load.

Wireless communications with uplink transmitter (Tx) switching may include an optional user equipment (UE) capability that allows uplink (UL) transmission on a band with the number of Tx chains unchanged during the switching. One Tx chain may be maintained on the band during UL switching. The optional UE capability may include modifications to the switching timeline. For example, an UL transmission on a third band may be made during UL Tx switching between two other bands.

The invention discloses a communication link automatic selection and concurrent transmission method under a helicopter limit condition, and relates to the technical field of aerospace. Comprising the following steps: firstly combing airborne communication link information, retaining four types of links including a satellite, an ultra-short wave, a short wave and a data transfer radio, and collecting parameters by means of a bus controller; filtering the data by using a Kalman filtering algorithm, and removing abnormal data through threshold verification; and finally outputting stabilized data. Determining a task scene and an environment scene based on the stabilization data in combination with airborne control screen task selection and environment sensor data; according to the technical key points, a fault precursor monitoring technology is adopted, a standby link pre-activation technology is combined, a seamless switching mechanism is matched, the defect that an existing system depends on manual switching is overcome, the automatic switching time of the link is shortened to be within 0.5 second, the communication interruption rate under the limiting condition is reduced to be lower than 5% from 30% or above, the real-time communication requirements of rescue, patrol and the like are met, and the real-time communication efficiency is improved. Good use prospects are realized.

This inverter control device: switches, in each carrier cycle, the state of a three-phase inverter among four kinds of use vectors such that the number of switching times is minimized; switches one basic space vector included in the four kinds of use vectors to a different basic space vector every 60-degree electrical angle; and switches a zero vector, which is used at the first timing of each carrier cycle, between two kinds of zero vectors every 60-degree electrical angle. When six electrical angles per one cycle of the inverter at the time of basic space vector switching are regarded as 0, 60, 120, 180, 240, and 300 degrees, six electrical angles per one cycle of the inverter at the time of zero vector switching become the angles obtained by adding, to the six electrical angles at the time of the basic space vector switching, the same prescribed angle of not less than 15 degrees but less than 45 degrees.

The invention discloses a modulation method of a four-switch Buck-Boost converter. The modulation method comprises the following steps: acquiring an output voltage; calculating error voltage; when the output power is larger than or equal to the preset power, the converter works in a first working mode, switches in the converter are turned on according to a first switch time sequence, and when the input voltage is larger than or equal to the output voltage, target inductive current is generated to enable a third switch to be turned on according to zero voltage; when the input voltage is smaller than or equal to the output voltage, target inductive current is generated to turn on the second switch at zero voltage; and when the output power is smaller than the preset power, the converter works in a second working mode, the switches in the converter are turned on according to a second switch time sequence, and target inductive current is generated, so that the second switch and the third switch are turned on at zero voltage. By means of the modulation method, the effective value and the peak value of the target inductive current are smaller than those of traditional modulation, and the efficiency of the converter under the light load is improved.

Aspects relate to wireless communication using multiple active bandwidth parts (BWPs). For example, a base station may configure a user equipment with two or more active BWPs. The user equipment may then use one or more of the active BWPS at a time. For example, the user equipment may use multiple active BWPs for full-duplex communication. Alternatively or in addition, the user equipment may switch between active BWPs taking advantage of the extremely low switching time (e.g., at or near zero seconds) between active BWPs.

The invention discloses a communication method and a communication device. The method is applied to an LTM switching scene. The method comprises the steps that a first node sends a first message to a second node, the first message is used for requesting to add the second node as a candidate auxiliary node of a terminal, the first message comprises first identification information, and the first identification information is used for requesting advanced synchronization configuration to the second node; the first node receives a second message from the second node, the second message is used for confirming that the second node is added as a candidate auxiliary node of the terminal, the second message comprises the first advanced synchronization configuration, and the first advanced synchronization configuration corresponds to the first identification information. And the switching time delay is reduced.

Embodiments of the present application provide a multi-serial communication scheduling method and system, electronic equipment and storage medium, relating to the technical field of serial communication. The method comprises: obtaining a serial switch instruction, the serial switch instruction carrying the station information where the execution device is currently located and the serial number of the execution device; obtaining the serial number of the control device of the current station in the preset mapping relationship library according to the station information where the execution device is currently located; the mapping relationship library comprises the mapping relationship between the station information and the serial number of the control device; establishing the binding relationship between the serial number of the execution device and the serial number of the control device of the current station; the binding relationship is used to realize the communication between the execution device and the control device of the current station. Thus, through the serial number dynamic binding mechanism, the operation of frequent disconnection and reconnection of the serial in the traditional method is avoided, the communication cost is reduced and the serial switching time is shortened, and the communication efficiency and stability are significantly improved.

The invention discloses an electric propulsion fault redundant drive switching method and system and an electric vertical take-off and landing aircraft, and relates to the technical field of electric propulsion systems.The method comprises the steps that when any channel fault signal is detected, a redundant drive system switching instruction is triggered; the optimal switching time is determined based on an online optimization mechanism of a performance index function through a dynamically generated q-axis current reference curve, a redundant channel current loop is controlled based on the optimized q-axis current reference curve, and seamless torque transfer from a fault channel to a normal redundant channel is ensured. According to the method, through the synergistic effect of dynamically generating the q-axis current reference curve and an online optimization mechanism based on a performance index function, on one hand, the stable transition of the system is ensured by selecting proper reference current while quick switching is ensured; and on the other hand, the reference current is dynamically optimized through a function expression, and the torque fluctuation of the motor during switching is avoided.