37results about How to "Reduce external electromagnetic interference" patented technology

The invention provides a coaxial cable power supply system of an electrified railway. The coaxial cable power supply system is composed of a center traction substation, coaxial cables, traction transformers, a contact system, a steel rail, circuit breakers and the like, wherein the center traction substation is connected with the coaxial cables; the coaxial cables are erected parallel with the contact system; the traction transformers are in single-phase connection, and are distributed along the coaxial cables and the contact system at certain intervals; a primary winding of each traction transformer is connected between an inner conductor and an outer conductor of the corresponding coaxial cable in parallel; a secondary winding of each traction transformer is connected between the contact system and the steel rail in parallel; the inner conductors of the coaxial cables are connected in parallel with the contact system by the adjacent traction transformers; the outer conductors of the coaxial cables are connected in parallel with the steel rail by the adjacent traction transformers. According to the coaxial cable power supply system, the power supply capacity and the voltage level are mainly determined by the coaxial cables; therefore the system is applicable for matching between the coaxial cables and various voltage grades of the contact system, and is beneficial to improving the light suspension and the overall quality of the contact system; the coaxial cables are erected along a railway or a subway tunnel without occupying additional corridors, so that interfaces between the railway and the public power grid can be reduced, the external power investment can be saved, and the management is facilitated.

The invention discloses an ultra-wideband radio over fiber positioning system, and belongs to the technical field of ultra-wideband radio communication. In the positioning system, ultra-wideband sensor nodes are sequentially connected by fibers to form an annular ultra-wideband sensor network distributed in a detection area. Optical time division multiplexing is realized by accurately controlling the lengths of the fibers among the sensor nodes, and ultra-wideband signals detected by different sensors are separated to different time slots of a signal period of an ultra-wideband signal source, so that signals of respective sensor nodes are distinguished and recognized. Ultra-wideband signals carrying position information of an object to be detected are received by the ultra-wideband sensor nodes and then transmitted back to a central processing unit through the fibers to process the positioning signals. Complexity of software and hardware of the sensor nodes can be effectively reduced while ensuring high ultra-wideband positioning accuracy, and the positioning system has low transmission loss and high system stability.

A transmitter processing method comprising: when in an all channel mode, do following steps: receiving beacon signals, transmitted by a touch panel, in multiple channels; and switching from the all channel mode to a single channel mode if the beacon signals are received in one channel of the multiple channels; and when in the single channel mode, do following steps: transmitting electrical signals in a time slot after the beacon signals are received; and receiving the beacon signals only in the one channel of the multiple channels.

The present invention discloses a 3D (Three-Dimensional) infrared touch system and a terminal thereof, which comprise an infrared module for establishing two layers of infrared nets over a display device for sensing a user touch operation; and an infrared recognition module for recognizing the user touch operation sensed by the two layers of infrared nets. 3D control is carried out by virtue of the infrared rays and as such, it is easy to be compatible with large-sized and oversized terminals. 3D touch for large-sized terminals is realized and great convenience is brought to the users.

The invention discloses a pressure wave propagation model cable space charge test system. A protection resistor (16), a model cable (18) and a capacitor (19) are disposed inside a metal shielding case (20). A DC generator (11), a high-voltage lead (12) and the protection resistor (16) are sequentially connected. The high-voltage lead (12) penetrates the wall of the metal shielding case (20). The protection resistor (16) is connected to a conductor of the model cable (18). The model cable (18) comprises a first connecting end close to the protection resistor (16) and a second connecting end far from the protection resistor (16), wherein the first connecting end of the model cable (18) is connected to the capacitor (19), and the second connecting end is grounded. The wall of the metal shielding box (20) is provided with a light hole, and the light emitted by a pulse laser (21) can shine on the model cable (18) through the light hole. According to the invention, the system can carry out pressure wave propagation (PWP) model cable space charge tests, strong signals can be obtained, the reliability of the signals can be tested, and the tests can be carried out without temperature limitation.

An electrocardiography (ECG) physiological monitoring system including an ECG sensor assembly further having at least a first capacitive electrode fabric layer configured to electrically couple to the subject's skin and detect ECG signals, a second reference electrode fabric layer that is configured to shield the first capacitive electrode fabric layer from electromagnetic interference, an electronics module that is in direct communication with the ECG sensor assembly and programmed to control the ECG sensor assembly, process ECG signals therefrom, and wirelessly transmit the processed ECG signals, and transmission conductors that are configured to provide a signal communication path between the electronics module and the ECG sensor assembly.

The invention provides an inductor assembly. The inductor assembly is formed by multiple inductors in a packaging manner, wherein each inductor comprises an inductance coil and two E-shaped magnetic cores; each magnetic core comprises a bottom column, and a middle column and two side columns protruding from the bottom column to the same side; the bottom column, the middle column and the side columns jointly form a magnetic core plane; the two side columns are positioned on the two sides of the middle column respectively; the opening ends of the two magnetic cores face each other; the middle columns of the two magnetic cores face each other; the side columns of the two magnetic cores prop against each other; two magnetic cores form two magnetic loops; the inductance coils are wound around the middle columns of the corresponding two magnetic cores; an air gap is formed between the middle columns of the two magnetic cores; the inductors are tightly arranged on the magnetic core planes in a rectangular array manner; and the magnetic cores of every two adjacent inductors prop against each other. The invention also provides a manufacturing method for the inductor assembly. The external electromagnetic interference of the inductor assembly is greatly lowered; the space utilization rate is obviously improved; and the inductor assembly has a good magnetic shielding effect even if the inductor assembly is small in volume.

The invention discloses a high-precision synchronous acquiring device. The high-precision synchronous acquiring device comprises a voltage transformer, a current transformer, a gear shifting control and signal conditioning module and an A / D chip, wherein the voltage transformer is used for sampling voltage signals before the device is connected to an electricity meter; the current transformer is used for sampling current signals before the device is connected to the electricity meter; the gear shifting control and signal conditioning module is used for automatic gain control, filtering and amplifying of the signals sampled by the voltage transformer and the current transformer; and the A / D chip is used for carrying out analog-digital conversion on the signals sampled by the voltage transformer and the current transformer and transmitting the converted digital signals to FPGA for processing. The signals acquired by the device have time mark information, synchronous high-precision acquisition of electric signals is realized, by the voltage transformer and the current transformer, sampling precision of the device is ensured, meanwhile, strong current is completely separated from weak current, electromagnetic interference of the outside is greatly reduced, and reliability and safety of the device are improved; and moreover, the information not only can be used on a foreground in real time, but also can be compressed and packed to be transmitted to a background for various application and analysis.

The invention belongs to the intelligent monitoring field and particularly relates to a three-dimensional motion posture sensing device. The invention provides a three-dimensional motion posture sensing device. A main frequency of a processor of the three-dimensional motion posture sensing device is high (reaching 180M), a resolution ratio of a sensor of the three-dimensional motion posture sensing device is high (an angle resolution ratio is 0.5 degree ) and the accuracy of the three-dimensional motion posture sensing device is high (a full scale relative accuracy reaches 2 / 1000). The three-dimensional motion posture sensing device comprises a master control module, a power supply conversion module, a voltage conversion module providing working power supply to various chips, an RS485 serial communication module, a posture data collection module, an ultralimit data storage module and an USB upper computer communication module; the power supply conversion module is connected to the voltage conversion module; the master control module is connected to the RS485 serial communication module, the posture data collection module, the ultralimit data storage module and the USB upper computer communication module.

The invention discloses an electric measuring device assembly, which comprises an electric measuring assembly, a front panel, a shell, a receiver-transmitter assembly, a stacking assembly and a magnetic coupling antenna assembly, wherein the auxiliary winding of the stacking assembly is respectively electrically connected to the electric measuring assembly and the receive-transmitter assembly, the magnetic coupling antenna assembly is arranged between the inside of the shell and the front panel, the electric measuring assembly is electrically isolated from the receiver-transmitter assembly, and the receiver-transmitter assembly is respectively electrically connected with the magnetic coupling antenna assembly and the electric measuring assembly. The electric induction assembly is low in cost, high in efficiency and simple and attractive in a dismounting structure, the electromagnetic interference among the electric assemblies can be greatly alleviated, and the transmission efficiency of an antenna can be optimized. The invention also discloses an electric induction assembly, a stacking assembly and an electric power transmission device assembly, involved in the electric measuring device assembly. The invention also discloses a single-phase electric measuring device.

The invention discloses a flat four-core composite mineral fire-proof control cable comprising an insulated cable core and a control cable core that are arranged in parallel. Three insulating wire cores are arranged in parallel at the center of the insulated cable core; a plurality of ground wire core conductors are distributed in parallel at the peripheries of the three insulating wire cores; andthe outsides of the ground wire core conductors and the three insulating wire cores are extruded by an inner inorganic mineral metal sheath. A plurality of control wire cores are twisted and then aninner inorganic mineral metal sheath extrudes the outsides of the plurality of control wire cores to form the control cable core. The gap between the insulated cable core and the control cable core isfilled with glass fiber filaments. The outsides of the insulated cable core and the control cable core are extruded by an outer flat inorganic mineral metal sheath. The cable having advantages of compact structure, small outer diameter, and reduced occupied space can be moved repeatedly, be bent, and be used vertically and is also easy to process and convenient to construct.

The invention provides a four-core square cable. The cable is of a square structure, and comprises a square outer sheath and four square cable cores stranded in the outer sheath, wherein each cable core comprises a square insulating layer and one to three wire cores in the insulating layer. According to the four-core square cable provided by the invention, the wire cores and the cable cores are directly towed, and filling materials and wrapping tapes are saved; material wastes caused by the fact that the length is increased through stranding are reduced, and the weight is reduced.

A small form-factor pluggable transceiver includes a housing, which includes an upper cover, a lower cover fastened to the upper cover, and a front plate arranged between an end of the upper cover and an end of the lower cover. The front plate, the upper cover, and the lower cover are assembled together so as to jointly define an accommodating space. The front plate includes a metallic layer defining a main surface thereof and two plastic structures connected to the metallic layer. The front plate has two through holes penetrating through the metallic layer for respectively accommodating two electrical signal connectors, and the two plastic structures are respectively arranged in the two through holes. When the two electrical signal connectors are respectively disposed in the two through holes, the plastic structures are arranged between the metallic layer and the electrical signal connectors separated from the metallic layer.

The invention discloses a five-core composite fireproof flat cable. The cable has a flat structure. Three insulation wire cores arranged in parallel and in a straight manner are arranged in the centerof the cable. Half circle of a plurality of ground wire core conductors and half circle of a plurality of neural wire cores are arranged outside the insulation wire cores in parallel. A ceramic silicon rubber anti-flaming band wraps the ground wire core conductors and the neural wire cores in a coiling manner. A mineral metal outer sheath wraps the ceramic silicon rubber anti-flaming band in an extruded manner. The mineral metal outer sheath is provided with groove holes filled with heat absorbing cotton. The cable provided by the invention has characteristics of being capable of moving, bending, putting into vertical use repeatedly, being compact in structure, small in outer diameter, easy to process, convenient for construction and the like.

The invention discloses an electric measuring device assembly, which comprises an electric measuring assembly, a front panel, a shell, a receiver-transmitter assembly, a stacking assembly and a magnetic coupling antenna assembly, wherein the auxiliary winding of the stacking assembly is respectively electrically connected to the electric measuring assembly and the receive-transmitter assembly, the magnetic coupling antenna assembly is arranged between the inside of the shell and the front panel, the electric measuring assembly is electrically isolated from the receiver-transmitter assembly, and the receiver-transmitter assembly is respectively electrically connected with the magnetic coupling antenna assembly and the electric measuring assembly. The electric induction assembly is low in cost, high in efficiency and simple and attractive in a dismounting structure, the electromagnetic interference among the electric assemblies can be greatly alleviated, and the transmission efficiency of an antenna can be optimized. The invention also discloses an electric induction assembly, a stacking assembly and an electric power transmission device assembly, involved in the electric measuring device assembly. The invention also discloses a single-phase electric measuring device.

The invention discloses a high signal-to-noise ratio pressure wave method model cable space charge test system, the protection resistor (16), the model cable (18), and the capacitor (19) are arranged in a metal shielding box (20), and a DC generator (11 ), the high voltage lead wire (12), and the protection resistor (16) are sequentially connected, the high voltage lead wire (12) passes through the box wall of the metal shielding box (20), and the waveguide (14) is arranged on the high voltage lead wire (12) At the box wall of the entrance, the high-voltage lead wire (12) is connected in series with the anti-interference resistor (15); after the outer layer of the anti-interference resistor (15) is wrapped with a self-adhesive insulating tape, the cable stress cone (13) is wrapped; the present invention adopts Installing a waveguide at the entrance of the high-voltage lead wire, connecting an anti-interference resistor in series in the lead wire, and using a metal shielding box can greatly reduce the impact of external interference signals on the space charge test system and significantly improve the system signal-to-noise ratio.

The invention provides a novel elevator motor connecting assembly and relates to the field of elevator accessory industry. The novel elevator motor connecting assembly comprises a motor main wire group and a control wire group and is characterized in that one end of the main wire group and one end of the control wire group are fixedly arranged on a support frame plate, the main wire group consists of three conducting wires and one grounding wire, a metal net layer is covered on the outer peripheries of the conducting wires and the grounding wire, a sheath is covered outside the metal net layer, the main wire group passes through a first hollow metal cable head, an inner cavity of the first metal cable head is connected with a spring leaf, and the spring leaf is connected with the metal net layer. Elevator motor cable connecting wires are connected through metal cable heads, and the external electromagnetic interference can be reduced, so the operation of the motor is reliable, and the occurrence of the elevator fault phenomenon is avoided.

The invention discloses a power line (10), a power module (100) and an unmanned aerial vehicle (200). The power line (10) comprises a connecting terminal (11) and a core wire (12); the connecting terminal (11) is used for being electrically connected with an electrode terminal (21) of the power panel (20), and a first through hole (111) and a second through hole (112) communicated with the first through hole (111) are formed in the connecting terminal (11); and the core wire (12) is arranged in the first through hole (111) in a penetrating manner, is fixed on the connecting terminal (11) through the second through hole (112), and forms an included angle with the connecting terminal (11). According to the design, the turning radius of the power line (10) can be reduced, wiring of the powerline (10) is simpler and more convenient, space waste and a complex wiring mode during wiring are avoided, and therefore external electromagnetic interference is reduced.

The present invention proposes a magnetic suction wire for storing VR glasses, including a glasses body, the glasses body is provided with a winding groove, a magnetic adsorption pad is provided at the bottom of the winding groove, and a VR wire is provided on the glasses body. The outer wall of the VR cable is spirally wound with a short-twist metal spring wire that is mutually adsorbed to the magnetic adsorption pad. The side of the glasses body is provided with a chute that runs through the winding groove. The slider is provided with a clamping positioning head, and the clamping positioning head is provided with a snap-in port for engaging the released VR line, and the side of the clamping positioning head facing the VR line in the unreleased state is provided with an unreleased VR line. The pressing port where the state VR line is against each other, and the thread management slider is provided with a clamping spring that pushes the line management slider towards the direction of the VR line in the unreleased state. The invention has the advantages of convenient carrying, convenient storage of wire rods, controllable release length of wire rods, effective prevention of wire rod knotting, high compressive strength of wire rods, softness and flexibility.

The invention relates to the field of vehicle electrical motors, in particular to an electromagnetic interference suppression method for a controller of a vehicle electrical motor. The electromagnetic interference suppression method comprises the following steps: embedding magnetic resistance materials in a notch of the vehicle electrical motor so that the vehicle electrical motor is at a flux weakening state; increasing a decoupling capacitor between the power supply of each integrated circuit of a controller and the ground, and bridging an electrolytic capacitor at the input end of the power supply; applying a soft-switching technology so as to carry out the status switching of a switching element during zero voltage and zero current of a switch; correcting the current waveform of the power supply so as to reduce the content of current harmonics and reduce the external electromagnetic interference of the power supply. The magnetic resistance materials are fixed in the notch of the vehicle electrical motor, and through the PCB (Printed Circuit Board) wiring design and the controller design, the electromagnetic interference of the controller of the vehicle electrical motor is effectively inhibited.

The invention provides a four-core triangular cable. The cable has a triangular structure and includes a triangular outer sheath and four triangular cable cores twisted in the outer sheath. Each cablecore includes a triangular insulation layer and one, two or three wire cores arranged in the insulation layer. The wire cores and the cable cores are both arranged in a straight manner, so that filling material and belting are saved, material consumption caused by increased length due to twisting is reduced and weight is reduced.

The invention provides a triangular cable with an optical fiber. The cable is of a triangular shape and comprises a triangular outer protective sleeve and four triangular cable cores which are stranded in the outer protective sleeve, wherein each cable core comprises a triangular insulating layer and one to three wire cores arranged in the insulating layer. According to the triangular cable provided by the invention, optical cable cores are arranged in the innermost layer; the optical cable cores not only can have an effect similar with steel wire armoring, can have a very good protection effect on the optical cable cores; effectively alleviate damages caused by an external force, but also can have a shielding effect, effectively reduce electromagnetic interference to peripheral electricalequipment and external electromagnetic interference.