498 results about "Twisted pair" patented technology

The invention relates to the technical field of hydropower engineering, and discloses a single-core self-healing type looped network networking method and system, and the method comprises the steps: dividing a whole network into a plurality of sub looped networks; each sub-ring network operates independently; the light switch in each sub-ring network adopts an A / B end connection mode; reversely connecting the B end of the last measuring point to the A end of the initial measuring station by using an optical fiber to form a closed physical structure; configuring a protocol on the switch, and controlling a data flow path through the protocol; different sub-ring networks are connected through RJ45 ports, and a CAT5E shielded twisted pair or an Ethernet interface is used; when a certain node or link fails, the protocol automatically triggers a switching mechanism; the master station optical transceiver monitors the states of all nodes in real time and displays fault points through a network management interface. The system comprises a sub-ring network module, a control data flow module and a fault point display module. The problems that a traditional networking method of hydropower engineering is poor in reliability, and self-healing cannot be achieved after an intermediate node is disconnected are successfully solved.

The invention discloses a multi-channel high-precision water level dynamic real-time monitoring system for a drilling water pumping test, and the system comprises a sensing layer which is used for deploying a multi-source sensor array, inhibiting interference through distributed layout and electromagnetic shielding, collecting multi-dimensional data in real time, and carrying out the preliminary filtering; according to the transmission layer, an optical fiber and twisted pair redundant network is constructed, an EtherCAT protocol is adopted for low-delay transmission, AES-128 encryption tampering prevention is integrated, and edge nodes compress data and verify integrity; the processing layer is used for carrying out real-time preprocessing on edge calculation and switching a standby sensor in abnormal detection; the cloud end predicts the water level trend through Spark Streaming analysis and an LSTM model, distinguishes interference through a random forest algorithm, and outputs calibration data and an analysis report; the application layer is used for constructing a three-dimensional drilling model based on Unity, dynamically displaying water level changes, synchronizing a multi-parameter curve and supporting historical backtracking; the early warning module notifies abnormity through sound and light and short messages, the decision module generates a report and supports multi-drill-hole comparison, and the test strategy is optimized.

The invention provides an analysis method and device for flow, efficiency and water consumption rate of a hydraulic power plant generator set. A distributed flow measurement unit based on a domestic PLC controller and a domestic operating system is constructed, and each unit is independently configured with the flow measurement unit to realize decentralization of data acquisition and processing; active power, guide vane opening, water head difference, instantaneous flow and volute inlet pressure data are collected in real time through a distributed flow measurement unit, and a unit efficiency and water consumption rate calculation model is dynamically fitted based on the data; sending an output result of the calculation model to a monitoring system through an anti-interference communication network, wherein the communication network adopts layered wiring and a double-shielded twisted pair to reduce the signal bit error rate; and the IMC integrated management and control platform is used for remote monitoring and diagnosis of the flow measurement unit, and seamless connection with a smart power plant data medium station is realized. The system reliability and the maintenance flexibility are improved, and the autonomous controllable requirements of domestic substitution and intelligent power plants are comprehensively met.

The invention discloses an insulation residual life prediction algorithm and device based on real-time temperature acquisition and a medium, and relates to the technical field of new energy automobiles, and the method mainly comprises the steps: constructing an offline insulation failure database through an accelerated thermal aging experiment of a twisted pair sample, and recording the PDIV of a target motor at a brand new state room temperature as an initial PDIV0; based on the off-line insulation failure database, obtaining the aging slope of the PDIV decaying along with the aging time at each motor winding temperature and a corresponding aging curve; according to the mapping relation between the PDIV and the motor winding temperature, obtaining an insulation threshold voltage corresponding to the current motor winding temperature under the correction of a temperature correction coefficient; and based on the current PDIV0 and the insulation threshold voltage, substituting the aging curve corresponding to the current motor winding temperature to obtain and output the difference value of the corresponding insulation failure time of the two as the insulation residual life. The method can accurately capture the initial characteristics of insulation aging, the early warning time is advanced, and the timeliness is improved.

An aspect of the present disclosure is directed to a connector. The connector is suited to connectorizing exactly two conductors. The connector includes a forward connector body, a rear connector body, a metal frame and exactly two electrical contacts. The rear connector body interfaces with the forward connector body. Further, the metal frame, which includes a shielding interface, surrounds at least a portion of both the forward and rear connector bodies. The electrical contacts extend from the rear connector body into the forward connector body. A first of the electrical contacts is electrically coupled to a first conductor of a shielded cable and the second of the electrical contacts is electrically coupled to a second conductor of the shielded cable. The shield interface of the metal frame is electrically coupled to the shield of the shielded cable.

The invention provides a development board based on a secure real-time bus SRB chip, and relates to the technical field of power electronics. The development board comprises any one or more of an SRB real-time single-twisted pair 100M Ethernet interface, an SRB real-time standard gigabit Ethernet interface, an SRB external memory interface EMIF parallel interface, an SRB serial peripheral interface SPI serial interface, an SRB configuration universal asynchronous receiver / transmitter UART serial port, an ARM RS422 serial port, an RS232 serial port, a CAN interface, an ARM UART serial port, an ARM 100M network port, an ARM JTAG interface and a power supply interface. According to the method, not only is the security bus characteristic test of the SRB chip concerned, but also other key function modules (such as an Ethernet interface, a memory interface, a serial peripheral interface and the like) are covered, so that a developer can more comprehensively evaluate the overall performance and reliability of the SRB chip, not just the security bus part.

According to the intelligent operation and maintenance and health monitoring system for the water conservancy and hydropower radial gate, a physical quantity detection module, a data acquisition and processing module, a gate opening and closing control module, a data transmission module, an interface display module and a system management module of the monitoring system are constructed; on-line monitoring parameters of the system are established and analyzed, and the control requirements of the hoist are determined to be opening control and synchronous control; a distributed system overall structure and a communication mode combining an Ethernet bus and optical fiber communication are established; a hardware structure of a monitoring system is constructed, and anti-interference measures of a twisted-pair shielding cable, a filter circuit, single-point grounding, floating ground shielding and a UPS power supply are adopted; a software structure of the monitoring system is constructed, and detailed analysis and program design are carried out on each functional module of software. The system can accurately monitor various state parameters such as stress strain and vibration when the radial gate operates, intelligent operation and maintenance of the radial gate and long-term stable detection of the health state are achieved, and safe and efficient operation of the hydraulic and hydroelectric gate is promoted.

The embodiment of the invention provides an electrocardio main cable based on a multi-layer heterogeneous shielding structure and a manufacturing method of the electrocardio main cable, and relates to the field of cables. Comprising a wire core group, a composite shielding layer structure and an outer sheath, the composite shielding layer structure and the outer sheath sequentially wrap the wire core group, the wire core group comprises a plurality of twisted pairs, and each twisted pair is formed by asymmetrically twisting a signal wire and a ground wire; the composite shielding layer structure is composed of a plurality of composite shielding sections which are arranged at intervals along the axial direction of the cable, and a resistive material is filled between the adjacent composite shielding sections; the composite shielding section sequentially comprises a spiral copper foil layer, a silver polyester braid layer and an amorphous silicon carbide coating from inside to outside, and the spiral copper foil layer wraps the outside of the multiple groups of twisted pairs; and the outer sheath is coated outside the amorphous silicon carbide coating. According to the invention, broadband shielding compatibility and pure physical structure noise reduction can be realized, the noise reduction effect is improved without additional electronic components, and the cable is light and low in cost.

The invention discloses a twisted pair crimping system and a twisted pair crimping method. The twisted pair crimping system comprises a cable clamp used for clamping and fixing a twisted pair, and each conductor core of the twisted pair comprises a plurality of conductive wires twisted together; the moving device is used for moving the cable clamp and the twisted pair in the horizontal direction perpendicular to the axial direction of the twisted pair; and the artificial intelligence visual device is arranged at the detection station and can simulate human eyes to identify the actual number of the conductive wires of each conductor core of the twisted pair. And when the artificial intelligence visual device recognizes that the actual number of the conductive wires of the conductor core is not equal to the preset number, the artificial intelligence visual device judges that the twisted pair is unqualified. According to the invention, the artificial intelligence visual device can simulate human eyes to identify the actual number of the conductive wires in the conductor core of the twisted pair. Therefore, whether the quality of the twisted pair is qualified or not can be judged in advance according to the identified actual number of the conductive wires in the conductor core, and the quality of the twisted pair product is improved.

The invention discloses a twisted pair crimping system and a twisted pair crimping method. The twisted pair crimping system comprises a cable clamp used for clamping and fixing a twisted pair; the moving device is used for moving the twisted pair; the artificial intelligence visual device can simulate human eyes to identify the actual positions of the geometric centers of the two conductor cores of the twisted pair moved to the detection station and the actual distance between the geometric centers of the two conductor cores; the position calibration device is suitable for calibrating the crimping position of the twisted pair according to the position deviation between the actual position and the preset ideal position when the actual distance is not smaller than the preset safety distance, so as to eliminate the position deviation; and the crimping device is arranged at the crimping station and is used for crimping the conductor core onto the terminal. When the conductor core is moved to a predetermined crimping position, a geometric center of the conductor core is located on a centerline of the terminal. According to the invention, the crimping position of the conductor core of the twisted pair can be calibrated according to the identified position deviation, and the crimping precision and quality of the twisted pair are improved.

The utility model discloses a twisted pair untwisting and straightening device, which relates to the technical field of twisted pairs and comprises a wire clamping support rod, and a handle assembly is arranged on the outer side of the wire clamping support rod. A spring sleeves the outer side of the wire clamping supporting rod and is located on the inner side of the connecting shell, a wire placement through groove is formed in the end, away from the handle, of the wire clamping supporting rod, a wire inlet and a movable groove are formed in the end, located on the outer side of the wire placement through groove, of the wire clamping supporting rod, a supporting shaft is arranged on the inner side of the movable groove, and a wire clamping arc block is rotationally connected to the outer side of the supporting shaft; a first pushing guide groove is formed in the connecting shell and located on the side, away from the wire containing through groove, of the movable groove. According to the twisted-pair untwisting and straightening device provided by the utility model, through the integral structure cooperation design, after a twisted-pair wire head is placed in the inner side of the wire placing through groove, the twisted-pair wire head can be clamped and fixed in the inner side of the wire placing through groove by pulling the handle, and then the handle can be pulled to clamp and straighten the twisted-pair wire and rotate to untwist the twisted-pair wire.

The invention provides a communication method, a communication device and a communication system, which are used for improving the communication performance of Ethernet. The method can be executed by a first device, and the first device is connected with a second device through two pairs of twisted pairs or four pairs of twisted pairs. The method comprises the steps that when two twisted pairs do not fail, first information is sent to second equipment, and the first information is used for representing that first equipment supports a variable speed communication mode; wherein the communication rate corresponding to the variable-speed communication mode is smaller than the first communication rate corresponding to the first communication mode and greater than or equal to the second communication rate; the first communication mode is a communication mode adopting four twisted pairs; and receiving second information from the second equipment, wherein the second information is used for representing that the second equipment supports the variable speed communication mode.

The high-flexibility machine tool drag chain flat type power supply cable comprises a reinforcing core, wires, insulating layers, an inner protective layer, a shielding layer and an outer protective layer, the outer side of the reinforcing core is provided with a plurality of wires in parallel, the outer side of each wire is coated with the insulating layer, two adjacent wires coated with the insulating layers are mutually wound to form a twisted-pair wire unit, and the inner protective layer is coated with the shielding layer. A plurality of twisted-pair wire units are arranged on the outer side of the reinforced core, the reinforced core and all the twisted-pair wire units are wrapped in an inner protective layer, a shielding layer is wrapped on the outer side of the inner protective layer, an outer protective layer is wrapped on the outer side of the shielding layer, and a plurality of reinforced wires are embedded in the outer protective layer. The flexibility of the cable is improved, the degree of freedom of the cable during bending is increased, the bending stress is effectively dispersed, so that the flexibility of the cable is remarkably improved, the internal lead is not easy to damage when the cable is frequently bent along with the movement of the drag chain box due to the design, and the service life of the cable is prolonged.

The present application provides a test system and test method based on Ethernet, including a test terminal and an Ethernet interface card, wherein a first USB interface of the test terminal is connected to a USB interface of the Ethernet interface card, an Ethernet twisted pair interface of the Ethernet interface card is connected to an Ethernet twisted pair interface of a vehicle computer under test, a serial communication interface of the vehicle computer under test is connected to a second USB interface of the test terminal, the Ethernet interface card receives a test instruction issued by the test terminal, and forwards the test instruction to the vehicle computer under test; the vehicle computer under test receives the test instruction forwarded by the Ethernet interface card, generates test data, and sends the test data to the test terminal; the test terminal sends the test instruction to the Ethernet interface card, receives the test data returned by the vehicle computer under test, compares the test data with preset data, and determines the detection result of the vehicle computer under test. In the present application, the test instruction is transmitted through the Ethernet interface card to improve the test efficiency.

The invention discloses a cross-platform real-time central control screen projection instrument display method, which relates to the technical field of vehicle-mounted systems, and is characterized in that real-time transmission of high-definition video data between a central control system and an instrument system is realized through an intelligent transmission technology and a special hardware component, the system integrates a serializer and a deserializer, and the real-time transmission of the high-definition video data is realized. The method supports automatic identification and conversion of various video formats, combines an AI enhancement algorithm, dynamically adjusts a compression mode, resolution and refresh rate according to factors such as content complexity and bandwidth, and ensures an efficient and clear display effect. According to the method, the high-performance shielding twisted pair is adopted, the good anti-interference capability is achieved, and the stability of data transmission is guaranteed. According to the invention, the limitation of inter-core communication which depends on the same SOC traditionally is overcome, the separated deployment of the central control system and the instrument system is supported, the synchronous management of data resources is simplified, the adaptability is high, the real-time performance is high, and the flexibility and the user experience of the central control projection screen in vehicle-mounted and industrial applications are remarkably improved.

The invention discloses a differential bus transmission verification system based on a digital ink-jet printer and a printer, and relates to the technical field of printing equipment data transmission, the system comprises a first main control module, a second main control module, 14 pairs of differential signal lines, a downlink channel and an uplink channel, a dynamic verification module adjusts the bit width of a verification code according to the type of a data packet, and the downlink adopts an enhanced CRC algorithm. An odd-even, accumulation and combination algorithm is used for uplink, the algorithm can be switched and retransmission is carried out when continuous error data packets are encountered; a time sequence control module is used for measuring transmission delay, adjusting a clock phase and guaranteeing transmission accuracy; a self-defined bus protocol is divided into three layers; a data packet structure and printing instruction analysis are stipulated; the system has an exception handling mechanism, speed reduction, redundant channel cutting, error recording and diagnosis report generation are performed when verification fails and exceeds a threshold value, a differential signal line is of a twisted-pair structure, signal stability is ensured, and the system is used for connecting a printer with a printing head drive and a motion platform and transmitting a control instruction to ensure reliable and stable data transmission.

The utility model provides a portable twisted pair twisting device. The portable twisted pair twisting device comprises a shell, a driving assembly arranged in the shell, a clamping assembly and a manual opening and closing assembly, the clamping assembly and the manual opening and closing assembly are arranged outside the shell, the manual opening and closing assembly controls the clamping assembly to perform opening and closing actions, and the driving assembly controls the clamping assembly to perform circumferential rotation actions. The manual opening and closing assembly and the driving assembly can control the clamping assembly to act independently or cooperatively. The portable twisted pair twisting device provided by the utility model solves the problems of low efficiency and easy finger scratching of the existing twisted pair untwisting mode.

The invention provides an intelligent temperature control system for an automobile part die-casting die, relates to the field of automobile part manufacturing, and aims to solve the problems that traditional manual temperature control is low in efficiency and poor in precision and cannot meet modern production requirements easily. The system comprises a temperature monitoring, control and execution mechanism and a human-computer interaction interface. The temperature monitoring module is calibrated by a standard platinum resistor temperature source and a least square method to ensure that the measurement is accurate and the deviation meets the requirement, acquires the temperature and converts the temperature into an electric signal, and transmits the electric signal to the temperature control module in the control cabinet of the die-casting machine through a shielded twisted pair. According to the stored die-casting process parameters, a cooling medium flow regulating valve of an executing mechanism regulates the flow speed, and a heating device controls the temperature in a partitioned mode. The man-machine interaction interface supports local and remote operation, displays data in real time and receives instructions, and finally effectively avoids the defects of mold sticking, shrinkage cavities, cracks, poor flowability and the like caused by improper temperature of the casting.

The invention discloses a twisted-pair cable processing system, a twisted-pair cable cutting method and a twisted-pair cable untwisting method. The twisted-pair cable processing system comprises: a frame; and the core wire untwisting device is mounted on the rack and is used for untwisting a pair of exposed core wires of the twisted-pair cable. The core wire untwisting device comprises a mounting plate which is fixed on a rack; the rotating wheel is rotationally mounted on the mounting plate, and a mounting hole penetrating in the axial direction is formed in the rotating wheel; the positioning body is embedded into the mounting hole of the rotating wheel and is provided with a pair of core wire insertion holes; and the driver is used for driving the rotating wheel and the positioning body embedded in the rotating wheel to rotate together. And when the end parts of a pair of exposed core wires of the twisted-pair cable are inserted into the pair of core wire jacks, the driver drives the rotating wheel and the positioning body to rotate so as to untwist the pair of exposed core wires of the twisted-pair cable. Therefore, the untwisting of a pair of core wires of the twisted-pair cable can be automatically realized, and the production efficiency is improved.

The invention discloses a large-scale data center equipment racking system and method based on U-bit control, the system comprises a plurality of rows of cabinets installed in a machine room, the row head cabinet of each row of cabinets is provided with an RTU data collector, the RTU data collectors are connected with an access switch installed in the machine through twisted pairs, and the access switch is connected with a data center through a data line. The access switch is connected with a data server installed in a monitoring room through an optical fiber. A handheld scanning server wirelessly connected with the data server is arranged in the monitoring room, the handheld scanning server is wirelessly connected with a scanning gun, the scanning gun is used for scanning a two-dimensional code of equipment to be loaded and transmitting recognized information to the handheld scanning server, and the handheld scanning server transmits analyzed information to the data server; and the data server stores the information of the shelved equipment, and allocates an optimal shelving position for the equipment to be shelved according to the information transmitted by the handheld scanning server. According to the invention, the rationality of large-scale data center equipment distribution is improved, the overall load is more balanced, and the loss of cables is reduced.

The invention belongs to the technical field of synchronous control, and particularly relates to a synchronous control system and method for vibration suppression and quality monitoring of twisted pairs, and the method comprises the following steps: S1, obtaining the measurement data of an acceleration sensor and a laser displacement sensor array on a twisted pair production line, a real-time vibration vector field of the twisted pair in the monitoring area is constructed through data fusion; based on the real-time vibration vector field, utilizing a Hamiltonian agent model to predict the vibration energy state of the twisted pair in a future prediction time window; and S2, adjusting a weight coefficient for minimizing the weighted sum of the predicted vibration energy and the control increment norm in real time according to the twisting quality characteristic index calculated in the previous control period. According to the method, conversion from passive response to active predictive suppression is realized, optimal control measures can be taken before vibration deterioration, and the timeliness of vibration suppression is improved.

The utility model discloses a double-shielding high transmission data cable, including: insulating core wire, buffer hose, aluminum plastic composite tape, ground wire, metal braid layer and sheath, insulating core wire is formed by three insulating layer co-extrusion on the conductor, every two insulating core wire pair twist to form one group of twisted pair wire, each group of twisted pair wire is lapped with aluminum plastic composite tape, the metal braid layer is lapped with the buffer hose, the metal braid layer is lapped with the metal braid layer, the metal braid layer is lapped with the metal braid layer, and the metal braid layer is lapped with the metal braid layer. The four groups of twisted pair wires are twisted into a cable by taking the ground wire as a center, a metal braided layer is braided on the four groups of twisted pair wires which form the cable, an aluminum foil layer on an aluminum-plastic composite belt is in contact with the metal braided layer and the ground wire, a buffer hose is spirally wound on the metal braided layer at equal intervals, and the buffer hose is formed by mixing and extruding a PVC material and aluminum hydroxide particles. And a sheath is extruded on the metal braid layer, is filled in the gap of the buffer hose and is attached to the metal braid layer. The advantages of the utility model are that the cable can maintain the high-speed and high-reliability transmission performance of data signals in a conventional environment and an environment in which a fire disaster occurs or a building collapses.

The invention discloses a twisted-pair cable posture adjusting method and a twisted-pair cable processing method. The twisted-pair cable attitude adjustment method comprises the following steps: shooting an image of an end face of a twisted-pair cable; calculating the attitude of the twisted-pair core wire of the twisted-pair cable at the end surface according to the shot image; calculating the initial attitude of the twisted-pair core wire at the cutting position of the outer coating layer to be stripped according to the attitude of the twisted-pair core wire at the end surface, the length of the outer coating layer to be stripped from the twisted-pair cable and the twist pitch of the twisted-pair cable; according to the initial attitude of the twisted-pair core wire and the predetermined attitude of the twisted-pair core wire, calculating an adjustment angle of the twisted-pair cable needing to be rotated; and rotating the twisted-pair cable around the central axis of the twisted-pair cable to adjust the angle, so that the twisted-pair core wire is adjusted to a preset posture. According to the invention, before the outer coating layer of the twisted-pair cable is stripped, the adjustment angle required to be rotated for adjusting the twisted-pair core wire of the twisted-pair cable to the predetermined attitude can be accurately obtained, and the processing efficiency and precision of the twisted-pair cable are improved.

The invention discloses a twisted-pair cable processing system and a twisted-pair cable cutting method. The twisted-pair cable processing system comprises: a frame; and the core wire cutting device is mounted on the rack and is used for cutting a pair of exposed and untwisted core wires of the twisted-pair cable. The core wire cutting device comprises a positioning body which is provided with a cable jack allowing one end of a twisted-pair cable to be inserted and a pair of core wire jacks allowing a pair of exposed core wires of the twisted-pair cable to pass through; and the cutting tool is arranged behind the positioning body and is used for cutting a pair of exposed core wires of the twisted-pair cable. A positioning reference surface perpendicular to the axial direction of the core wire jack is formed in the cable jack, and the positioning reference surface is used for being axially attached to the cutting end face of the outer coating layer of the twisted-pair cable so as to axially position the twisted-pair cable and ensure that a pair of exposed core wires of the cut twisted-pair cable have a preset length.

The invention belongs to the technical field of cables, and provides a high-temperature-resistant low-smoke halogen-free flame-retardant twisted-pair cable for a building security system and a preparation method thereof. Magnesium hydroxide is modified by adopting a sol-gel method, and the surface of the magnesium hydroxide is coated with silicon dioxide, so that the magnesium hydroxide has excellent hydration effect and free radical capture capability at high temperature, and the flame retardance and smoke suppression performance are improved; secondly, on the basis of alkaline lignin, through chemical modification of phosphonitrilic chloride trimer and triphenyl phosphate, a phosphorus-nitrogen structure and a phosphate group are introduced, the thermal stability and carbonization capacity of lignin are remarkably enhanced under the catalytic action of titanium dioxide, and a compact carbonization protection layer is formed to block oxygen and heat. The two flame-retardant materials are respectively fused and mixed to finally obtain the low-smoke halogen-free flame-retardant cable. The cable material has excellent flame retardance and low smoke emission performance, and is suitable for building security and protection systems with high safety requirements.

The utility model discloses a novel civil air defense three-proofing control device, which is characterized in that three state instructions of clean ventilation, poison filtering ventilation and isolated ventilation, which are sent by an upper computer of a civil air defense ventilation mode control box and are received from an RS485 twisted-pair communication bus, are transmitted to an RS485 twisted-pair communication bus through a programmable controller; an action program of a civil air defense tail end control box-lower computer is compiled, and is downloaded to a control loop of each electric actuating mechanism, so as to control the opening and closing of a civil air defense fan, a civil air defense air valve and a civil air defense sewage pump; and meanwhile, operation state parameters of each electric actuating mechanism are fed back to a civil air defense ventilation mode control box-an upper computer, a civil air defense three-proofing control device and a civil air defense tail end control box-a lower computer through an RS485 twisted-pair communication bus, so that the whole control closed loop of the civil air defense control system is completed.

The invention relates to the technical field of 20Hz low-frequency alternating-current power transmission, and provides a 20Hz miniature mutual inductor phase angle error accurate measurement system, which comprises a relay protection tester for outputting 20Hz current and voltage; the to-be-tested miniature mutual inductor (TA / TV) isolates and converts the secondary current / voltage into a voltage signal to be collected by the A / D converter; the series resistor is connected in series to the front end of the micro current transformer to be measured, and the voltage difference between the two ends of the series resistor is connected to the analog input type merging unit through a twisted pair; the analog quantity input type merging unit is used for acquiring the accessed sine analog quantity small signal and sending the sine analog quantity small signal to the outside in an IEC61850-9-2-SV format; and the control computer is used for controlling the adding amount of the relay protection tester, receiving the SV message through the network card, executing the Friedel-Crafts calculation to obtain the amplitude and the phase angle of the sine vector, and obtaining the phase angle transmission error of the 20Hz micro transformer to be tested. According to the invention, the phase error of the 20Hz miniature mutual inductor can be accurately measured.

The present invention discloses a visible light communication device based on a power line carrier circuit and a communication method thereof. The device includes: an Ethernet interface circuit, a power line carrier circuit, a switching switch, a signal attenuation circuit, a light source driving circuit, a light source, an avalanche photodiode, a photoelectric conversion circuit, a linear amplifier circuit, and a power detection circuit. The switching switch can switch the signal transmission mode from visible light communication to power line communication when the optical communication quality is poor, thereby improving the stability of the communication system. The power line carrier circuit modulates the signal in various ways, including OFDM, QPSK, BPSK, and ROBO. Compared with traditional visible light communication systems using OOK modulation, the communication rate and stability are significantly improved. The power detection circuit, the signal attenuation circuit, and the light source driving circuit cooperate to effectively control the power of the transmitted signal, enabling the signal to be transmitted without distortion. In addition, the power line can be replaced with a wire, twisted pair, etc., further improving the anti-interference capability and mobility.

To provide a connector structure which can prevent degradation in terminal holding force for an outer terminal and in electrical connection reliability between the outer terminal and a braid, in a shield connector using a twisted pair wire.SOLUTION: A connector structure comprises: an inner sleeve 6 which has a front crimping part 60 located on an end side of a shield wire 10 so as to be caulked in an overlapping manner and a rear crimping part 64 that has an outer shape smaller than that of the front crimping part 60 and is located on a depth side of the front crimping part 60, and which is disposed over an outer peripheral side of a braid 13 exposed from an end of a sheath 14; and an outer terminal 21 having a shield body 22 which covers an outer periphery of an inner housing 4 for housing an inner terminal, and a caulking part 23 which extends from the shield body 22, and is provided with a first crimping part 25 and a second crimping part 27 respectively crimped to outer peripheral shapes of the front crimping part 60 and the rear crimping part 64 so as to be electrically connected to a folded portion 13a of the braid 13 that is folded back and disposed over an outer peripheral side of the inner sleeve 6.SELECTED DRAWING: Figure 8

The utility model provides a differential circuit structure and electronic equipment, and belongs to the technical field of differential circuits. The differential circuit structure comprises a terminating component which comprises a first port and a second port, the two ports respectively comprise a first wiring terminal, a second wiring terminal, a first metal ring and a second metal ring, and the two metal rings are respectively used for grounding; the wire twisting part comprises a ground wire, and a first signal wire and a second signal wire which spirally surround the ground wire respectively; the first end of the first signal line is connected with the first wiring terminal on the first port, and the second end of the first signal line is electrically connected with the first wiring terminal on the second port; the first end of the second signal wire is connected with the second wiring terminal on the first port, the second end of the second signal wire is electrically connected with the second wiring terminal on the second port, and the two ends of the ground wire are grounded respectively. Compared with a common twisted pair, the differential line structure can reduce electromagnetic radiation more reliably.