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97results about How to "Guaranteed synchronicity" patented technology

Power-off synchronous operation method and system for frequency converter

The invention relates to a power-off synchronous operation method and system for a frequency converter. The method includes the steps of: S1. monitoring bus voltage in real time by a host frequency converter, and entering Step S2 when the bus voltage is smaller than a preset power-off synchronization value V<llimit>; S2. detecting real-time voltage V of a bus, and calculating actual deceleration time T* according to the real-time voltage V and a preset target voltage V<target>; S3. adjusting the operating frequency of the host frequency converter according to current operating frequency and the actual deceleration time T* calculated in S2, so that the bus voltage is stabilized at the preset target voltage V<target>; and S4. when the operating frequency of the host frequency converter is larger than zero, outputting the operating frequency to slave frequency converters which control operating frequency of themselves to be synchronous with the received operating frequency, and skipping to the Step S2. According to the power-off synchronous operation method, after power-off, the bus voltage is automatically increased and is maintained at the target voltage V<target> in real time, thereby guaranteeing normal operation of a motor, systems with various load inertia are automatically adapted to, and synchronization of slaves is guaranteed.
Owner:SUZHOU INOVANCE TECH CO LTD

Satellite on-orbit telemeasuring data real-time monitoring system applicable to unidirectional communication network

ActiveCN107579791AGuaranteed synchronicityResolve mutual isolationRadio transmissionRelay systems monitoringSatelliteData application
The invention discloses a satellite on-orbit telemeasuring data real-time monitoring system applicable to a unidirectional communication network. The system comprises an on-orbit telemeasuring data source end network monitoring module, a unidirectional network transmission module, an on-orbit telemeasuring data application side network monitoring module. The on-orbit telemeasuring data source endnetwork monitoring module comprises a telemeasuring receiving end, a data receiving server, a file server, an on-orbit real-time monitoring terminal and a database; the unidirectional network transmission module comprises a unidirectional network gate, a data synchronization server and a file synchronization server; and the on-orbit telemeasuring data application side network monitoring module comprises a file server, a message notice server, a database, an on-orbit telemeasuring monitoring terminal and a notice terminal. The satellite on-orbit telemeasuring data real-time monitoring system applicable to the unidirectional communication network provided by the invention can achieve real-time monitoring of the satellite on-orbit telemeasuring data of the unidirectional communication network, provides data storage services for two ends of the network, and provides a data synchronization mechanism to ensure synchronism of the data at two ends.
Owner:SHANGHAI SATELLITE ENG INST

Communication network time service method and system based on PTP time synchronization signal

The invention discloses a communication network time service method based on a PTP time synchronization signal. The method comprises the following steps: step S1, producing an initial clock frequencysignal, and generating a local initial PPS signal according to the initial clock frequency signal; step S2, acquiring a main clock PPS signal, and comparing the main clock PPS signal with the local initial PPS signal, regulating the initial clock frequency signal according to a comparison result so as to obtain a standard clock frequency signal, and generating a local check PPS signal according tothe standard clock frequency signal; step S3, performing frequency division on the standard clock frequency signal to obtain a frequency-dividing clock frequency signal, and preforming the frequency-division on the frequency-dividing clock frequency signal to obtain a high-precision clock frequency signal; and step S4, producing a PTP clock synchronization message timestamp according to the high-precision clock frequency signal and the local check PPS signal, and analyzing the PTP clock synchronization message timestamp to produce the local time. The method and system disclosed by the invention have the technical effect of being high in reliability and synchronization.
Owner:武汉中元通信股份有限公司

Sewing machine

ActiveCN105113150AImproved thread trimming qualityGuaranteed synchronicityNeedle severing devicesEngineeringKnife holder
The invention provides a sewing machine, and belongs to the technical field of sewing machines. The problem that for an existing sewing machine, after a thread is cut, the thread residue left on cloth is longer is solved. The sewing machine comprises a base plate and a machine shell, a frame needle is arranged on the machine shell, a lower shaft and a drive shaft are rotatably connected in the base plate, the end of the lower shaft is rotatably connected with a moving blade frame, a moving blade is fixedly connected to the moving blade frame, the drive shaft is in drive connection with the moving blade frame and can drive the moving blade frame to rotate, a fixed blade is connected with the base plate in a sliding mode, a drive plate is hinged to the base plate, the edge of the moving blade frame is provided with a guide surface in the circumferential direction, a tension part is connected to the drive plate, the distance between the guide surface and the shaft axis of the lower shaft is gradually decreased from one end to the other end, and when the moving blade frame rotates and enables the moving blade to move to the direction of the fixed blade, the drive plate can enable the fixed blade to be close to the frame needle. By means of the sewing machine, the thread residue which is cut is shorter, and the thread cutting quality is improved.
Owner:ZHEJIANG ZOJE SEWING MACHINE

Heat-preservation die and heat-preservation construction method for ultra-low temperature pipeline

The invention relates to a heat-preservation die and a heat-preservation construction method for an ultra-low temperature pipeline, and particularly discloses a heat-preservation die and a heat-preservation construction method for an ultra-low temperature pipeline, which are applied to a hydrogen-fueled system of a rocket. By the heat-preservation construction method for the ultra-low temperature pipeline, the phenomena of dropping, cracking, frosting and the like of a heat-preservation layer and the pipeline caused by the cooling shrinkage of the pipeline can be prevented. The method comprises the following steps: a, mounting the heat-preservation die for the ultra-low temperature pipeline on the ultra-low temperature pipeline; b, filling heat-preservation pulp into the heat-preservation die for the ultra-low temperature pipeline; c, after the heat-preservation pulp is solidified to form the heat-preservation layer, disassembling the heat-preservation die for the ultra-low temperature pipeline. According to the heat-preservation die and the heat-preservation construction method for the ultra-low temperature pipeline, a release agent and release cloth are used as a release lining, and the release time is strictly controlled, so that the forming quality of a heat-preservation material is ensured; during heat-preservation construction, the whole pipeline is coated with a special anti-freezing solution, so that the synchronism of contraction and expansion processes between different materials is ensured.
Owner:CHENGDU CONSTR ENG GROUP CORP

Data transmission method and system for terminal and earphones

The invention relates to a data transmission method and system for a terminal and earphones, and the earphones comprise two independent wireless earphones, and the method comprises the steps: respectively building communication connection with the two wireless earphones based on radio waves of different frequency bands; acquiring all data packets sent to each wireless earphone by the terminal; sending all the two paths of data packets to the respective corresponding wireless earphones in sequence at the same time according to respective preset sequences; respectively verifying the first data packet and the second data packet which are successively and continuously received by each wireless earphone; and if the first data packet and the second data packet received by each wireless earphoneare verified to be correct and the first data packet and the second data packet are different, analyzing the first data packet to play the audio information contained in the first data packet. The beneficial effects of the invention are that the method reduces the burden of mutual communication of two earphones in the prior art, also reduces the delay time of audio playing and the power consumption of a wireless earphone, and improves the cruising ability.
Owner:昱兆微电子科技(上海)有限公司

Bluetooth headset based on a BLE protocol

The invention discloses a bluetooth headset based on the BLE protocol which comprises a first Bluetooth headset body and a second Bluetooth headset body, and the two Bluetooth headset bodies each comprise a main control module, a power module, an audio collecting and processing module, an audio output module, an electrostatic protection module, a classic Bluetooth module and a BLE Bluetooth module, and the power module, the audio collecting and processing module, the audio output module, the electrostatic protection module, the classic Bluetooth module and the BLE Bluetooth module are connected. Wherein the first Bluetooth earphone is in communication connection with a mobile phone through the classic Bluetooth module, and the first Bluetooth earphone is connected with the second Bluetoothearphone through the BLE Bluetooth module. According to the invention, communication transmission between the two Bluetooth headset bodies is carried out through the BLE Bluetooth module; The Bluetooth headset has the advantages that transmission of audio data is achieved, wireless packet loss detection is performed on transmitted audio data packets through the main control module on the Bluetooth headset, data integrity in the transmitted audio data packets is judged, audio playing synchronism is guaranteed, audio data playing effect is greatly improved, and satisfaction degree of users in use is increased.
Owner:HEFEI STAROT INFOTECH CO LTD

Distributed power transformer winding state monitoring method and system based on vibration method

The invention discloses a distributed power transformer winding state monitoring method and system based on a vibration method. A vibration acquisition unit is installed beside a transformer by adopting a distributed architecture to obtain a vibration signal, and the vibration signal is sent to an upper computer through an optical fiber after analog-to-digital conversion; a current and voltage acquisition device is installed at a secondary terminal of a transformer to acquire a current signal and a voltage signal, the current signal and the voltage signal are sent to the upper computer through an optical fiber after analog-to-digital conversion, the upper computer sends a clock synchronization command to the vibration acquisition unit and the current and voltage acquisition unit, the acquired information is processed and analyzed through a built-in algorithm model, and the health state of the winding is judged. By collecting and transmitting the signals in the mode, the problems of amplitude attenuation and electromagnetic interference caused by direct transmission of electric signals can be effectively avoided, and meanwhile, the synchronism of remote signal sampling is also ensured. The system is low in coupling degree and high in expandability, and can be applied to various occasions such as transformer substations and test rooms.
Owner:JIANGSU ELECTRIC POWER CO +1
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