Patents
Literature
Patsnap Copilot is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Patsnap Copilot

765results about How to "Reduce switching times" patented technology

Controlling method of 4 phase permanent magnet fault tolerant motor

The invention discloses a control method of a four-phase permanent magnet fault-tolerant motor. In the method, a control mode can be automatically decided according to the diagnosed situation of a system failure; when the system is at a normal state, an SVPWM control is adopted; when the system has a phase-lacking failure, a fault-tolerant torque control is adopted; different fault-tolerant control proposals are adopted according to different types of phase-lacking failures. The control method realizes that the four-phase permanent magnet fault-tolerant motor can operate with high performance under the normal condition and the phase-lacking condition, overcomes the deficiency that the stable performance of the system when in normal working is reduced in the traditional fault-tolerant control system which adopts current for regulating PWM for realizing current tracing for the convenience of fault-tolerant control, establishes a mathematical model of the four-phase permanent magnet fault-tolerant motor under a rotating coordinate system, successfully applies an SVPWM strategy to the four-phase permanent magnet fault-tolerant motor and enhances the dynamic and static performances and reliability of the control system of the four-phase permanent magnet fault-tolerant motor.
Owner:JIANGSU UNIV

Method and device capable of judging whether terminal is switched between two wireless networks

The invention discloses a method and a device capable of judging whether a terminal is switched between two wireless networks. The method comprises the following steps: judging whether the signal intensity of a first wireless network on the position of the terminal which is accessed to the first wireless network satisfies a first switching condition, if does not satisfy, judging not to switch; otherwise, judging whether the switching times in a first period satisfy a second switching condition, if does not satisfy, judging not to switch, and otherwise judging the terminal to be switched. The invention further discloses a method capable of judging whether the terminal is switched from the second wireless network to the first wireless network, and the device capable of judging whether the terminal is switched between the two networks. The signal strength is used as a first condition to judge whether the terminal is switched between networks, when the switching conditions are satisfied, the switching times in unit time are used for deciding whether to be switched, so that the ping-pong switching phenomena between different networks are reduced, and energy consumption and network source cost brought by the terminal are reduced.
Owner:CHINA TELECOM CORP LTD

Configuration method and system used for satellite-bone SRAM (Static Random Access Memory) type FPGA (Field Programmable Gate Array) working on track for long time

The invention relates to a configuration method and system used for a satellite-bone SRAM (Static Random Access Memory) type FPGA (Field Programmable Gate Array) working on track for a long time. The method comprises the following steps: electrification: a delay configuration strategy is adopted for the FPGA to avoid configuration errors caused by power supply fluctuation generated at the moment of the boot; configuration process monitoring: the configuration condition of the FPGA is monitored by a DSP (Digital Signal Processor), and when the configuration of the FPGA is monitored to be normally completed, the FPGA is informed of entering a normal measurement state by the DSP, and an on-line reconfiguration step is started if the configuration of the FPGA is monitored to be not completed in time; reconfiguration: a low-level pulse larger than 300ns is controlled to be applied to a configuration reset pin of the FPGA by the DSP under the condition of uninterruptible power supply, and then the configuration process is automatically completed by the FPGA; normal working process monitoring: whether the configuration of the FPGA is correct or not is monitored regularly by the DSP in a normal working process, and FPGA on-line reconfiguration is started by the DSP if the configuration of the FPGA is wrong; and regular reconfiguration: a triple modular redundancy design is adopted for the FPGA, and is matched with the regular reconfiguration to improve the reliability of the FPGA.
Owner:NAT SPACE SCI CENT CAS

Control method for auxiliary switching tube of active clamp flyback converter

The invention relates to a control method for an auxiliary switching tube of an active clamp flyback converter. In the flyback converter, severe energy loss and voltage spike of a main switching tube are caused due to leakage inductance of a transformer and leakage inductance of circuits. The conventional solution mainly comprises methods for solving the problems by using residual current device (RCD) clamp, liquid crystal display (LCD) clamp and active clamp, wherein an active clamp circuit can effectively recover leakage inductance energy and obviously improve the efficiency. The invention provides a novel control method on the basis of the conventional active clamp flyback converter topology. In the conventional control method, a primary side switching tube is in complementary conduction with an auxiliary switching tube in each period; and in the control method, the primary side switching tube is switched on in each period, the auxiliary switching tube is controlled by setting voltage of a clamp capacitor in the clamp circuit, and when the voltage of the clamp capacitor reaches the set value, the auxiliary switching tube is switched on. Compared with the prior art, the method has the advantages that: the switching loss of the auxiliary switching tube can be reduced; and more importantly, the efficiency of the circuit can be greatly improved under a light load, and the no-load loss is reduced.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Low voltage load online phase modulation device and phase modulation method thereof

The invention relates to a low voltage load online phase modulation device and a phase modulation method thereof. According to the invention, optimization selection is performed to phase sequence state combination of electric load of users in a power distribution area, and then the electric load of the users is switched freely among phases A, B and C via a controllable switch, so that loads of the three phases of the power distribution area can be balanced. The low voltage load online phase modulation device fully integrates advantages of a mechanical switch and an electronic switch, so that the function of zero passage seamless switching of voltage and current can be realized, the impacts on a low voltage power grid and the electric load of the users are avoided, and the reliability of power supply and the voltage quality are guaranteed. The low voltage load online phase modulation device ensures that the load of the three phases of the power distribution area realizes minimum unbalance degree, the switching times of the switch is minimum, and the service life of the low voltage load online phase modulation device is improved. The low voltage load online phase modulation device has the function of three-phase load adjustment, and moreover, has functions of fault protection for over-current and over-voltage and leakage protection.
Owner:STATE GRID SHANGHAI ENERGY INTERCONNECTION RES INST CO LTD

Self-adaption switching method for fast terminal in satellite network

ActiveCN106792946AReduce the number of switching between satellitesImprove performanceRadio transmissionWireless communicationSatelliteTelecommunications link
The invention discloses a self-adaption switching method for a fast terminal in a satellite network and belongs to the technical field of the satellite communication. The method comprises the steps of finding visible satellites, constructing a two-dimensional mobile model, calculating the remaining service time of the visible satellites one by one, selecting a visible satellite as a target satellite which has a vacant channel resource and has the longest remaining service time, and establishing a communication link with the new target satellite. The two-dimensional mobile model does not depend on users' historical movement data, and therefore a very large storage space is not needed; the newly provided two-dimensional mobile model is universal, not only is suitable for calculating the remaining service time of fast terminal users, but also can be used for analyzing the remaining service time of common low-speed users, and self-adaptation switching demands of two types of users are satisfied; besides, the self-adaptation switching strategy can not only be applied to a single-layered satellite network model, but also can be used for a double-layered satellite network model, and the movement scenes are more universal.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Long-term evolution system self-adaptation frequency deviation precorrection method under environment of high-speed rail

The invention discloses a long-term evolution system self-adaptation frequency deviation precorrection method under the environment of a high-speed rail. The long-term evolution system self-adaptation frequency deviation precorrection method under the environment of the high-speed rail is characterized by including the following steps: (1) distributing stations along railway by adopting the mode of a baseband processing unit (BBU) and a remote radio unit (RRU), transforming an uploading radio-frequency signal received by each RRU into a baseband signal and sending the baseband signal to the BBU, (2) conducting least squares (LS) channel estimation by the BBU according to the baseband signals sent by different RRUs based on an uploading reference signal, (3) calculating uploading frequency deviation of different user data correspondingly received by each RRU according to an LS estimated value on the reference signal. The long-term evolution system self-adaptation frequency deviation precorrection method under the environment of the high-speed rail is capable of increasing coverage area of single cell along the railway of long term evolution and LET-A system, reducing switchover and improving success rate of user access.
Owner:SOUTHEAST UNIV

Multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) cognitive radio communication method

The invention provides a multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) cognitive radio communication method. A radio-frequency module outputs intermediate-frequency data which is used for spectrum detection to determine whether a spectrum is an idle spectrum or not, if so, optimum spectrum analysis and channel estimation are conducted to determine the characteristic of the spectrum, then optimum spectrum allocation is conducted to determine routing lines for information transmission, and when a master user requires to use the current frequency band, other routing lines are selected and used for data transmission; a cognitive module transmits a control signal to the radio-frequency module, wherein the control signal is used for setting the parameters of the secondary frequency variation of the radio-frequency module and setting the communication frequency band of a data transmission module; and each cognitive user has two transmitting and receiving antennas which are used for transmitting and receiving data, and signaling information is transmitted between the cognitive module and the data transmission module and is used for selecting transmission lines and proper transmission power. The method has the advantages that the spectrum utilization ratio is improved, the channel switching times are reduced, the data transmission quality is improved and the goal of stably transmitting cognitive data to the cognitive users is achieved.
Owner:HARBIN ENG UNIV

Antenna switching device and method, and mobile terminal

The invention discloses an antenna switching device and method, and a mobile terminal. The device comprises a sensing module and a switching module, the sensing module comprises a sensing unit, wherein the sensing module is used for sensing change information of stray capacitance generated when a limb approaches to the sensing unit through the sensing unit, and determining a shielding state of an antenna system according to the change information of the stray capacitance; and the switching module is used for judging whether the signal of a current working frequency band is deteriorated, and executing an antenna switching action according to the shielding state when the signal of the current working frequency band is deteriorated. Therefore, the situation that the antenna system is shielded when the mobile terminal is held on a left hand or a right hand can be detected, the antenna is switched accordingly to keep the balance and left and right hand performance of the antenna and improve the network access experience and call experience when the mobile terminal is held on the hand of a user. Moreover, the antenna switching action is executed only when the signal of the current working frequency band is deteriorated, thereby reducing the switching times, reducing the energy consumption and improving the stability of the system.
Owner:QIKU INTERNET TECH SHENZHEN CO LTD

Multi-vehicle mounted station cooperation cell switching method for train-ground communication under high-speed moving environment

The invention discloses a multi-vehicle mounted station cooperation cell switching method for train-ground communication under a high-speed moving environment. The first scheme comprises the following steps of: arranging a vehicle mounted station at the front end and the rear end of a train, wherein the two vehicle mounted stations are mutual communication backups; applying a communication resource for the vehicle mounted station at the rear end while switching the vehicle mounted station at the front end; directly switching to the communication resource applied by the vehicle mounted station at the front end while switching the vehicle mounted station at the rear end; or switching the vehicle mounted station at the rear end by directly using available information acquired by the vehicle mounted station at the front end. The second scheme comprises the following steps of: switching with only the vehicle mounted station at the front end and performing data communication with only the vehicle mounted station at the rear end; applying the communication resource for the vehicle mounted station at the rear end and recording the switching position while switching the vehicle mounted station at the front end; and directly switching to the communication resource applied by the vehicle mounted station at the front end while the vehicle mounted station at the rear end reaches the switching position. The method has the advantages of short switching time, uninterrupted communication during the cell switching and capability of meeting the requirements of the train-ground communication under the high-speed moving environment.
Owner:SOUTHWEST JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products