73results about How to "Improve signal anti-interference ability" patented technology

The invention discloses a voltage detection circuit of a motor controller for an electric vehicle. The voltage detection circuit comprises a voltage input circuit, an input differential operation circuits, an analog opto-coupler isolation circuit, a voltage follower and a DSP (Digital Signal Processing) processor, wherein an output end of the voltage input circuit is connected with an input end of the input differential operation circuit, and an output end of the input differential operation circuit is connected with an input end of the analog opto-coupler isolation circuit; and an output end of the analog opto-coupler isolation circuit is connected with an input end of the voltage follower, and an output end of the voltage follower is connected with a detection port of the DSP. According to the voltage detection circuit, the cost is saved, simultaneously the voltage value of a power supply of the motor controller can be monitored in real time by hardware, and the supply voltage parameters of the controller can be supplied to a motor control system of a pure electric vehicle.

The invention relates to an image processing system based on a Field Programmable Gate Array (FPGA), and belongs to the field of image processing. The system includes: a video decoding module, an image processing module arranged on the FPGA and a video coding module, wherein the video decoding module includes a LVDS receiving unit, a CCIR-D receiving unit and a SD-SDI receiving unit, and the video coding module includes a DVI coding module and a CCIR-D coding module. According to the invention, the SD-SDI receiving unit adopts an equalizer GS2994, and a clock recovery device GS2965 for strengthening the signal anti-interruption capacity, and adopts a SDRAM sequential to realize conversion of a PAL sequential and a VGA sequential; the chip clock of the SDRAM can meet the requirements of the design at 100 MHZ. The image processing system has small power consumption. The image processing system and the FPGA require no need of occupation of exclusive pins therebetween. The image processing system addresses the problem of complexity of debugging of image processing based on FPGA in the prior art.

The invention discloses a tower crane lifting hook video monitoring device with energy-saving and doubling functions, which comprises an image collecting and transmitting module, a solar power supply module and a display memory module, wherein the image collecting and transmitting module and the solar power supply module are arranged on an amplitude-change trolley of a tower crane, the display memory module is arranged in a cab, the image collecting and transmitting module comprises an infrared all-in-one machine, a video sever and a wireless network bridge which are sequentially connected, the infrared all-in-one machine and the video server are simultaneously connected with a dormancy energy-saving controller, the solar power supply module comprises a power supply controller which is respectively connected with a solar assembly and a storage battery, the power supply controller is respectively connected with the infrared all-in-one machine, the video server, the wireless network bridge and the dormancy energy-saving controller, the display memory module comprises a multiplying power control module, an image control display and a wireless network bridge B, and the multiplying power control module is connected with a pedal unit. The invention also discloses a lifting video monitoring method using the tower crane lifting hook video monitoring device, and the remote control on the camera lens magnification and the dormancy and energy-saving functions are realized through a pedal module.

The invention discloses a power equipment and transmission line malfunction comprehensive online monitoring system which comprises a wireless temperature measuring terminal, a line malfunction detector, a transfer station, an information receiving main station, a database server and a monitoring host. The wireless temperature measuring terminal is wirelessly connected with the information receiving main station through a built-in wireless communication module, the line malfunction detector is wirelessly connected with the information receiving main station through a built-in wireless communication module and the transfer station, and the information receiving main station is connected with the database server which is connected with the monitoring host. The system can monitor and upload power equipment temperature rise standard exceeding and transmission line ground fault information in real time, quickly locate line fault sections and fault branches, shorten fault clearing time and improve safety and reliability of power equipment and transmission lines.

The invention discloses a method for achieving frequency modulation emergency broadcast based on RDS. The method comprises the following steps that firstly, basic tuning and switching information frames, emergency broadcast data frames and broadcast text frames are combined into a data package to be sent out at regular intervals through the emitting station; secondly, when a receiving terminal receives the data package sent by the emitting station, whether the emitting station supports emergency broadcast and plays the emergency broadcast or not is recognized according to the basic tuning and switching information frames, if the emitting station supports the emergency broadcast and plays the emergency broadcast, the third step is carried out, and otherwise, the next data package is waited to be received and processed; thirdly, when the receiving terminal judges that the receiving terminal is a matched receiving terminal according to the emergency data frames, the emergency broadcast is received and played. The frequency modulation emergency broadcast data information is transmitted based on the RDS technology, the frequency resources are saved, the anti-interference ability of the signal is strong, and users can receive the emergency broadcast information in time.

The invention discloses a water meter centralized-reading device in a master-slave machine mode. The device comprises a GPRS module, master machines consisting of a primary master machine and a secondary master machine, slave machines, a collector and a terminal water meter, wherein the master machines comprises the primary master machine and the secondary master machine, the master machine are divided into at most three levels, at most 64 slave machines are networked, the master machines and the slave machines are connected in a wireless transmission mode, the plurality of slave machines can be arranged on each master machine, the GPRS module is connected with the master machines via 485 buses in a wired manner, the slave machines are connected with the collector via the 485 buses in a wired manner, the collector and the terminal water meter transmit data via MBUS, each master machine corresponds to an ID number, and at most 16 slave machines can be networked by the single master machine, the ID numbers of the slave machines and the corresponding master machine are the same, and each master machine is provided with a clock for periodically automatically reading the meter and uploading data.

The invention provides an automatic guiding vehicle intelligent control system and method. The system comprises a trolley charging station and a plurality of automatic guiding vehicles. Signal connection is established among the plurality of automatic guiding vehicles through a wireless mesh network, and the plurality of guiding vehicles include a first automatic guiding vehicle that performs a delivery task and idle automatic guiding vehicles that are fully charged. When the current electric quantity of the first automatic guiding vehicle is lower than a preset electric quantity, the first automatic guiding vehicle sends an alert signal to a main control device and a nearby idle automatic guiding vehicle through the wireless mesh network, and the idle automatic guiding vehicle obtains theinformation of the delivery task and a target of the delivery task from the first automatic guiding vehicle through connection to continue to complete the delivery task The system and method of the invention realize stronger signal anti-interference capability, and are more efficient in vehicle replacing management and control.

The invention discloses a ground-based broadcasting type locating method. Ground-based broadcasting stations are built in a located area, code division multiple access modulation is carried out on information of identification codes, the longitude, the latitude, the elevation and the clock of the ground-based broadcasting stations, the ground-based broadcasting stations continuously send the processed information of the identification codes, the longitude, the latitude, the elevation and the clock of the ground-based broadcasting stations, the information is transmitted to an onboard receiver of an aircraft through an L band, and the onboard receiver receives the information sent by the ground-based broadcasting stations, and carries out frequency conversion and demodulation on the information to obtain the identification codes, the longitude, the latitude and the clock, wherein the identification codes, the longitude, the latitude and the clock are contained in the information sent by the ground-based broadcasting stations; comparison between the signal receiving moment of the onboard receiver and the information, obtained through demodulation, of the clock is carried out, the distance between the aircraft and the corresponding ground-based broadcasting station is calculated, and then the position of the aircraft is obtained through calculation. According to the ground-based broadcasting type locating method, anti-interference performance of signals is good, accurate locating and accurate navigation of the aircraft can be achieved, and the ground-based broadcasting type locating method has the advantages of being all-weather, high in accuracy, low in cost, easy to achieve, good in real-time performance, multipurpose and the like.

The invention discloses a water-bottom high-voltage direct current transmission system based on carrier energy extraction and feedback. The system mainly comprises a direct current power transmissioncircuit, an auxiliary carrier power circuit and a carrier voltage signal feedback circuit. The direct current power transmission circuit performs transmission of electric energy from a water surface to a water bottom, the auxiliary carrier power circuit performs power assistance in the circuit at the water bottom, and the carrier voltage signal feedback circuit feeds back the output voltage at thewater bottom to a water source. The water-bottom high-voltage direct current transmission system achieves that the water bottom source separately assists in power supply and direct closed-loop control from the output voltage to the water source, and is good in timeliness, simple in starting process and high in reliability.

The invention belongs to the technical field of high-precision time delay, and particularly relates to a high-precision time delay system and method based on an FPGA and a time delay chip, and the system comprises an external triggering input module, an FPGA module, a low-jitter clock module, a fine time delay generation module, and an ultra-narrow pulse width signal generation module. The external triggering input module is connected with an I/O port of the FPGA module. The FPGA module is connected with a low-jitter clock module, the low-jitter clock module U3 provides a low-jitter clock signal for the FPGA module, the FPGA module is connected with the fine delay generation module, and the fine delay generation module is connected to the ultra-narrow pulse width signal generation module.Coarse time delay is achieved through counting of the FPGA module, and the time delay range is large; the fine time delay generation module can realize fine time delay through a special time delay chip, and the time delay resolution is high and can reach a time delay range of 5 ps to 5.115 ns; and the low-jitter clock module is adopted to generate low-jitter clock signals, and low-jitter and high-quality reference clock signals are provided for the FPGA. The system and the method are used for signal delay.

The invention relates to the field of welding, and discloses a magneto-electricity induction-type welding line tracking device, aiming at providing a welding line tracking device which reflects the position variation of a welding line accurately. The magneto-electricity induction-type welding line tracking device comprises a detection part, an induction part and a micro processor, which are sequentially connected. The magneto-electricity induction-type welding line tracking device provided by the invention is high in tracking accuracy, low in distortion degree and high in signal anti-interference capability according to a magneto-electricity induction principle, can set a tracking mode to track the welding line automatically, and timely rectify the position deviation of a welding gun relatively to the welding line so as to guarantee that the welding gun is aligned at the welding line for performing uninterrupted automatic welding operation, improve the welding productive efficiency, and lower the welding production cost.

The invention discloses a hydraulic machinery cavitation and gas-liquid two-phase flow monitoring method and device, and particularly relates to a method and a device by the aid of active ultrasonic technology, digital signal demodulation technology and non-contact measurement technology supporting vector machine identification technology. The method includes the steps: placing an ultrasonic transducer; building a flow-state classifier; acquiring data; analyzing and identifying the data and the like. The device comprises the ultrasonic transducer, an acoustic acquisition card, a computer, a signal acquisition system, a signal analysis system and the like. The method and the device have the advantages that disassembly is convenient, interference of non-intervention installation to system operations is less, the anti-jamming capability of signals is high, flow states are accurately judged and the like. The method and the device can be applied to real-time monitoring of operation states of hydraulic machinery.

The invention discloses a DC voltage type PLC photovoltaic shutoff device circuit, which includes a photovoltaic module VPV, an input capacitor C4, a switch tube Q1, a freewheel diode D1, a first LC notch filter, an output capacitor C5, a transformer T1, a coupling capacitor C6, a third LC notch filter, a signal filter resistor R1, a signal filter capacitor C7 and a second LC notch filter. The twoends of the output capacitor C5 are output terminals. When the switch tube Q1 is opened, a series current and a PLC signal pass through the freewheel diode D1 to realize normal power line carrier communication; and when the switch tube Q1 is closed, power line carrier communication is stopped, and a series current passes through the switch tube Q1, without affecting the efficiency of the system and the stability of the system. The efficiency of the system, the stability of the system and the reliability of communication can be improved.

The object of the invention is to provide a driving circuit of a diesel engine position control type actuator. The driving circuit of the diesel engine position control type actuator includes a driving signal input circuit, an over-current protective circuit, a driving current feedback circuit, a pulse feedback circuit and an emergency stop signal input circuit. The driving circuit of the diesel engine position control type actuator has the advantages that (1) the output of a driving logic is realized by using a photoelectric coupler and MOSFET as main logic conversion elements, and the selection of element types is simple and easy to realize; (2) a system can adjust PWM control signals according to a feedback driving current and a driving pulse, thus the self-control of the system is realized; (3) the driving the circuit of the diesel engine position control type actuator has an over-current protection function, when a current is too large, the over-current protective circuit can turnoff a Q8 control switch at the lower end of the actuator to prevent the damage to the circuit caused by the excessive current; and (4) when the driving circuit fails, the actuator can be turned off independently in time through the emergency stop signal input circuit, and the driving the circuit of the diesel engine position control type actuator has a function of safety protection.

The invention discloses a liquid level monitoring system, and relates to the technical field of control. The liquid level monitoring system mainly aims to solve the problems that the traditional wired control wiring is complex, the signal anti-interference capability is weak, the cost is high, the upgrading and maintenance are difficult, the wireless control network is high in power consumption, and the wireless monitoring problem of a mobile terminal cannot be realized. The liquid level monitoring system comprises a processor, a controller and a server, wherein the processor is used for sending a liquid level setting value to the controller by establishing a first thread in double threads, and receiving a liquid level measurement value fed back by the controller by establishing a second thread in the double threads, and performing displaying; the controller is used for calculating a liquid level control parameter and outputting according to the received liquid level setting value sent by the processor by adopting a PID control algorithm, and sending the detected liquid level measurement value to the processor and the server in a wireless communication mode when the control operation of the liquid level control parameter is operated; and the server is used for storing the liquid level measurement value sent by the controller and generating historical data of the liquid level measurement value.

The invention relates to the technical field of buoyancy balance of underwater vehicles, and discloses a water volume detection and cabin pressure alarm device of a buoyancy balance water cabin, which comprises a sealing barrel, a liquid level meter, an airtight opening sealing head, a guide rod limiting seat, a sealing end cover, a pressure switch, a watertight connector, a floater and a guide rod, one end of the sealing cylinder is open, and a sealing end cover is arranged at the open end; a liquid level meter for detecting water volume, a pressure switch for alarming cabin pressure and a watertight connector respectively connected with the liquid level meter and the pressure switch are arranged in the sealed cylinder, and the watertight connector is used for transmitting a liquid level signal and a cabin pressure alarm signal in a water cabin to the outside; the sealing end cover is provided with an airtight detection port and an airtight port sealing head; one end of the guide rod is connected with the liquid level meter, and the other end of the guide rod is provided with a floater and connected with a guide rod limiting seat. The device can measure a liquid level position signal in the water storage tank and give an overpressure alarm, and is simple in overall structure, reliable in function and easy to realize.

The invention discloses a central lock system for a vehicle. The central lock system for the vehicle comprises a power supply module, an RF receiving module, a breathing light module, a phase line detection module, a one-key starting module, an electronic door lock detection module, a GPRS module, a code learning key module, a central lock detection module, a high beam detection module, a head indicating lamp module, a vibration alarm module, an MCU control module and a relay control module; and the MCU control module is connected with the RF receiving module, the breathing light module, the phase line detection module, the one-key starting module, the electronic door lock detection module, the GPRS module, a code learning key module, the central lock detection module, the high beam detection module, the head indicating lamp module, the vibration alarm module and the relay control module. The central lock system for the vehicle has the advantages that functions such as a window automatic rolling-up and closing function, an automatic locking and unlocking function, a one-key starting function, a headlight delay function, a GPS positioning system function and an APP remote operationsystem function can be realized, and remote operation is additionally provided.

The invention discloses a CAN remote communication system based on an optical transceiver. The system comprises a near-end device and a far-end device which are connected through an optical fiber. The near-end device and the far-end device each comprise an optical module, an optical fiber data transceiver, a CAN controller and a CAN bus local area network which are connected in sequence. According to the invention, the maximum communication distance of the CAN bus is expanded to the transmission distance of dozens of kilometers from the maximum communication distance of 40m through optical transmission; signals are transmitted through optical fibers, so that the signal anti-interference capability of the system is improved; the far-end device and the near-end device can complete network expansion of multiple groups of CAN buses only through one optical fiber, so the problem that the two devices are connected through multiple cables is simplified, and the problems of electromagnetic radiation, electromagnetic shielding and the like caused by cable connection are avoided; and the two optical transceivers are respectively deployed in a far-end device and a near-end device. The limited range of the CAN bus expansion network subnet can be self-defined according to the specific requirements of a user.