38results about How to "Good resistance to electromagnetic interference" patented technology

The invention provides a program on-line programming system for a multimedia card (MMC) flexible direct-current power transmission valve base controller. The program on-line programming system comprises function board cards 1, function board cards 2 and a connecting board, wherein the function board cards 1 and the function board cards 2 are arranged in parallel, and the connecting board is respectively connected with the function board cards 1 and the function board cards 2. The program on-line programming system for the valve base controller for a high-capacity MMC flexible direct-current power transmission converter has the advantages that program programming modes are flexible and diverse and do not interfere with each other.

The invention discloses a perimeter security early warning system based on fiber grating sensing, comprising: a fiber grating displacement sensor, a pulley, a protective steel cable, a transmission optical cable, a wavelength demodulation analyzer, a control host, a display screen, a pan-tilt camera, an acoustic Optical alarm and transmission cable; when working, the steel cable is protected from sensitive intrusion behavior, so that the sensing light signal of the optical fiber grating displacement sensor changes, and the displacement information obtained by the wavelength demodulation analyzer is transmitted to the control host, and the control host analyzes the displacement information; When the perimeter intrusion is found, the control host judges the intrusion location, the pan-tilt camera rotates to the intrusion location, and collects video images. At the same time, the sound and light alarm sends out sound and light alarms, stores video, displacement, and early warning information, and monitors them through the display screen. show. The invention has the advantages of anti-electromagnetic interference, low early warning false alarm rate, convenient deployment and maintenance, suitable for complex terrain layout, and can link video collection and sound and light alarm functions, and has very broad application prospects.

A multifunctional distributed optical fiber sensor for road strain testing and heat conduction snow melting, which relates to an optical fiber sensor. In order to meet the needs of mechanical performance testing of road surface structures in cold regions and anti-skid snow melting in winter, the invention designs a sensor that can simultaneously realize the The internal mechanical response test of the pavement structure in cold regions and the multifunctional distributed optical fiber sensor for the melting of ice and snow on the pavement. The present invention includes a plurality of transverse sensing elements and a plurality of longitudinal sensing elements, and the plurality of transverse sensing elements are arranged side by side in parallel, and the head and tail of the plurality of transverse sensing elements are connected in sequence to form a series structure; The lengthwise direction of the sensing elements is arranged side by side, and the ends of the longitudinal sensing elements are connected sequentially, and the center line of the transverse sensing element along the length direction is perpendicular to the center line of the longitudinal sensing element along the length direction. The stressed optical fiber is responsible for collecting the internal strain data of the pavement structure in the cold area, and the heat conduction resistance melts the snow through electricity and heat, so as to realize the multi-functionality of the road surface monitoring equipment in the cold area.

The invention relates to a bunched frequency conversion submarine cable and a manufacturing method thereof, which legitimately combines a plurality of frequency conversion cable units together and transmits power supplies of different parameters to electric submersible pumps of multiple producing wells on a marine petroleum exploitation platform. The submarine cable comprises frequency conversioncable units, gap filling materials, an armoring cushion layer, a metal armoring layer and a submarine cable outer protective layer, wherein the frequency conversion cable units are twisted into the cable, the gap filling materials are filled among the frequency conversion cable units, the armoring cushion layer is arranged outside the frequency conversion cable units twisted into the cable, the metal armoring layer is arranged outside the armoring cushion layer, and the submarine cable outer protective layer is sheathed outside the metal armoring layer; and each frequency conversion cable unit comprises a power cable core, a control cable core, a gap filler, a metal shield layer and a protective layer, wherein the power cable core comprises a power cable core conductor, a power cable coreinsulation layer, a semiconductive shield layer and a power cable core metal shield layer, and the control cable core comprises a control cable core conductor, a control cable core insulation layer and a control cable core metal shield layer.

A nano-type magnetosensitive rotation speed sensor is composed of sensing unit and post-processing circuit. Said sensing unit consists of magnetic head, Fe-base nano magnetic band wound by coil L, adjustable bias magnet and casing. Said post-processing circuit comprises voltage stabilizer, magnetosensitive oscillator, filter amplifier, shaper and OC gate. Its advantages are high sensitivity, long active distance, high thermal stability and anti-interference power, and long service life.

A voltage signal processing method of a high-voltage frequency converter and a measuring device, the voltage acquisition circuit adopts a resistance voltage division processing method, and is characterized in that: the voltage signal is collected by a resistance voltage division at both ends of the input and output of the high-voltage frequency converter, and respectively The collected voltage signal is sent to an input and output voltage detection device, after differential amplification, isolation and filtering of the conditioning circuit, signal conditioning such as digital processing and conversion processing is performed, and then the digital processing and conversion results after signal conditioning are sent to the The logic processor performs calculation and control; and the signal after the logic processor communicates with the main control board of the high-voltage frequency converter through optical fiber. The resistive voltage sampling circuit of the present invention solves the technical problems of large volume, large error and inaccurate control of the high-voltage transformer in voltage detection, and measures the input and output voltage of the frequency converter by means of resistance voltage division, which is small in size, low in cost and high in reliability .

The present invention provides a road-use optical fiber grating interlayer relative horizontal displacement sensor. According to the technical scheme of the invention, the test on the relative horizontal displacement between layers inside a pavement structure is realized. A top cover is embedded into the bottom of an upper-layer structure. A center column is connected with a top cover and a uniform strength beam, so that the top cover and the uniform strength beam move together. A bottom plate is embedded into the top of a lower-layer structure, and monitors the mutual displacement condition of the above two layers. A fixed ring is used for fixing the top cover and the bottom plate. Under the fixation of the fixed ring, only a tangential displacement is generated between the top cover and the bottom plate, so that the top cover and the bottom plate are not mutually separated. A silica gel pad is placed between the fixed ring and the bottom plate to limit the rotation of the bottom plate and the top cover, so that the top cover and the bottom plate are rebounded after the displacement. A fixed plate is used for fixing the silica gel pad of and other structures, so that the silica gel pad of and other structures are located inside the bottom plate. The uniform strength beam converts the horizontal sliding generated by the sensor into the vertical displacement. A sliding groove is arranged in the bottom plate and a glass cover plate is covered onto the sliding groove to increase the scratch resistance thereof. An optical fiber grating is stuck onto the uniform strength beam by a special structural adhesive, and the deformation of the uniform strength beam is converted into the wavelength change of the optical fiber grating.

The invention belongs to the field of power grid monitoring, and particularly relates to a power distribution network fault detection and location decision system, which comprises an electronic transformer, a data acquisition and merging module, a Zigbee communication module, and an upper computer S3C6410, wherein the electronic transformer communicates with the data acquisition and merging module; the data acquisition and merging module is in signal communication with the upper computer S3C6410; the upper computer S3C6410 is connected with the Zigbee communication module; and the Zigbee communication module is connected with a control terminal. A single chip microcomputer and a sampling and conditioning circuit are used for judging each grid state, the result is transmitted to the S3C6410 chip via a 485 bus, an environmental temperature and a real-time picture are acquired, the workload is greatly reduced, system reliability is improved, the measurement precision is high, the hardware circuit is simple, and the operation is simple.