14results about How to "Reduce electromagnetic radiation" patented technology

The application discloses an environmental protection gas load switch and belongs to the electrical equipment field, which is used to solve the problem of how to inhibit or eliminate the arc generated when the static contact and the moving contact of the load switch are disconnected. The environmental protection gas load switch comprises a shell, a moving contact, an operating mechanism, a first static contact and an arc extinguishing device. The moving contact is rotatably arranged in the interior of the shell, the operating mechanism is used for controlling the rotation of the moving contact, and the first static contact is fixedly arranged in the interior of the shell. The arc extinguishing device comprises a shell body, a rotating arm, a vacuum bubble and a reset spring, the shell body is fixedly arranged on the shell, the rotating arm is rotatably arranged on the shell body and is provided with an electrically conductive part, the electrically conductive part is arranged on the rotating path of the moving contact, the vacuum bubble is arranged on the shell body, and the two ends of the vacuum bubble are electrically connected with the electrically conductive part and the first static contact respectively, and the reset spring is arranged between the rotating arm and the shell body. When the moving contact is disconnected with the first static contact, the moving contact is electrically connected with the electrically conductive part.

The utility model relates to the technical field of heating cables, in particular to a heating cable for a high-grade building, which comprises two heating conductors which are symmetrically arranged, and a high-temperature-resistant insulating heat conductor I with a convex section is arranged between the two heating conductors. The two heating conductors abut against the left side and the right side of the protruding end of the first high-temperature-resistant insulating heat conductor respectively, an insulating block is arranged in the protruding end of the first high-temperature-resistant insulating heat conductor, and a heat insulation layer is arranged at the protruding bottom of the first high-temperature-resistant insulating heat conductor. The upper portions of the two heating conductors are covered with a second inverted-U-shaped high-temperature-resistant insulating heat conductor, the two ends of the U shape of the second high-temperature-resistant insulating heat conductor make contact with the surface of the heat insulation layer respectively, and an electromagnetic shielding layer is arranged outside a ring formed by the second high-temperature-resistant insulating heat conductor and the heat insulation layer. According to the electromagnetic shielding heating cable, the heat dissipation area can be increased, and meanwhile the heat radiation heating efficiency is improved.

This application relates to the field of electrothermal materials, and in particular to a self-regulating heating cloth with low electromagnetic radiation. The self-regulating heating cloth with low electromagnetic radiation includes an insulating silicone protective layer and a base fabric. The base fabric is woven with several self-regulating heating wires, several first conductive strips, and two second conductive strips. The first and second conductive strips are both conductive composite yarns, which are composed of several conductive composite yarns, including S-twist conductive composite yarns and Z-twist conductive composite yarns, which are spaced apart to form the conductive composite yarn. The self-regulating heating cloth of this application has low electromagnetic radiation intensity and better safety performance.

The utility model discloses a printed circuit board, a communication device and a vehicle. The printed circuit board comprises a dielectric related interface, an electrostatic impedor, a common-mode resistor, an alternating-current coupling capacitor, a common-mode filter and a control chip, and a differential signal line is connected to the control chip through the electrostatic impedor, the common-mode resistor, the alternating-current coupling capacitor and the common-mode filter in sequence; wherein the differential signal lines are arranged based on a cross-layer reference mode; wiring of the positive signal line and the negative signal line of the differential signal line, pin bonding pads on wiring paths and via holes in the wiring paths are all symmetrically arranged, and the positive signal line and the negative signal line are matched in equal length. Through the symmetrical arrangement and equal-length matching of the differential signal lines and the use of the electrostatic impedor, the common-mode resistor, the alternating-current coupling capacitor, the common-mode filter and other elements, noise and interference are effectively suppressed, and the integrity of signals is improved. The cross-layer reference and the reasonable wiring strategy help to reduce electromagnetic radiation and sensitivity, and improve the electromagnetic compatibility of the printed circuit board.

This invention belongs to the field of nanomaterials technology, specifically relating to a heating wire, its preparation method, and its application. The method for preparing the heating wire provided by this invention involves impregnating filamentous carbon nanotube fibers in a graphene-containing resin dispersion and then curing it. The resin layer containing graphene material encapsulates the filamentous carbon nanotube fibers. The filamentous carbon nanotube fibers prepared by this invention exhibit stable heating. When used in the heating system of a gas element analyzer, the heating wire exhibits low electromagnetic radiation and minimal interference with the hardware, making it more suitable for high-precision testing. The filamentous carbon nanotube fibers prepared by this invention have the advantages of stable heating and resistance to oxidation. The resin layer encapsulating the filamentous carbon nanotube fibers protects the carbon nanotubes, isolates them from air, and extends the service life of the heating element's carbon nanotubes.

The utility model relates to the technical field of transformers, in particular to a double-shielding boosting transformer which comprises an upper magnetic core and a lower magnetic core which are arranged oppositely. The lower magnetic core comprises a lower bottom column, a first lower middle column, a second lower middle column and a lower side column; the upper magnetic core comprises an upper bottom column, a first upper middle column, a second upper middle column and an upper edge column; a first core column is formed between the first upper middle column and the first lower middle column in an abutting mode. A second core column is formed between the second upper middle column and the second lower middle column in an abutting mode. A peripheral column is formed between the upper side column and the lower side column in an abutting mode. According to the utility model, after the first coil is wound around the first winding groove and the second coil is wound around the second winding groove, electromagnetic interference between the first coil and the second coil can be effectively reduced through a shielding structure formed by the upper bottom column, the lower bottom column and the second core column; in addition, electromagnetic radiation of the transformer can be effectively reduced through a shielding structure jointly formed by the upper bottom column, the lower bottom column and the peripheral column.

The application relates to a preparation process of an electromagnetic protection magnetic health-care fabric. The preparation process of the electromagnetic protection magnetic health-care fabric comprises the following steps: preparation of nano Fe-Co oxide magnetic powder; preparation of graphene-coated nano Fe-Co oxide magnetic particles; and spinning and textile of the magnetic health-care fabric. The spinning process comprises the following main process steps: cotton mixing, carding, drawing, combing, roving, spinning, bobbin winding, beam warping, harness threading and weaving. The nano Fe-Co oxide has excellent electromagnetic wave absorption capacity, the surface performance of the nano Fe-Co oxide is improved by coating nano graphene, the wave absorption capacity of the magnetic health-care fabric is enhanced, the magnetic health-care fabric is prepared by combining the magnetic field of the magnetic material and the magnetic health-care effect on the human body, and the magnetic health-care fabric has the advantages of protecting the human body, reducing the electromagnetic radiation of various electronic devices on the human body, and the like, health, bacteriostasis, magnetic health care and the like.

The utility model discloses a wireless charging device, which comprises a receiving coil, a receiving coil shell, a transmitting coil, a transmitting coil shell and a connecting piece, the receiving coil is arranged in the receiving coil shell; the transmitting coil is arranged in the transmitting coil shell; when the transmitting coil shell is moved to the receiving coil shell and the transmitting coil shell and the receiving coil shell are aligned to a preset position through the connecting piece, the transmitting coil and the receiving coil directly face each other and are in a matched state, and the gap and the offset between the transmitting coil and the receiving coil are smaller than or equal to a set threshold value. According to the utility model, the coil dislocation during charging can be reduced, the coil area can be reduced, the requirement for foreign matter detection can be reduced, and electromagnetic radiation can be reduced, so that the charging safety is ensured while the charging efficiency is ensured, and the manufacturing cost of the charging device is reduced.

The application provides a harmonic suppression radio frequency power amplifier, wherein one end of an input matching circuit is connected with a radio frequency input end; the other end of the input matching circuit is connected with a base of a power amplifier tube; a collector of the power amplifier tube is connected with a power supply voltage through a first matching branch; an emitter of the power amplifier tube is connected with a first connecting point on a packaging substrate; the collector of the power amplifier tube is connected with a radio frequency output end through a second matching branch; the second matching branch is connected with the packaging substrate; a first end of a harmonic control circuit is connected with the collector of the power amplifier tube; a second end of the harmonic control circuit is connected with a second connecting point on the packaging substrate; a metal layer farthest from the power amplifier tube in a plurality of metal layers of the packaging substrate is a first metal layer; the first connecting point and the second connecting point are located on a second metal layer in the plurality of metal layers, and the first connecting point is connected with the second connecting point; and the second metal layer is a metal layer closest to the power amplifier tube in the plurality of metal layers.

The present application relates to a motor with high electromagnetic compatibility level, comprising a stator assembly, a rotor assembly and an end cover assembly, the stator assembly comprises a metal shell, the rotor assembly comprises a rotor core and a rotor shaft, the end cover assembly comprises an end cover, the shell comprises a first end provided with a bearing chamber and an open second end opposite to the first end, the motor is further provided with a metal cover, the cover is provided with a plurality of retaining tabs on its peripheral edge, the end cover is provided with a plurality of positioning protrusions on its peripheral outer surface, a positioning notch for cooperating with the positioning protrusions and a retaining notch for cooperating with the retaining tabs are arranged at the end edge of the second end of the shell, so that the rotor assembly and the end cover assembly are completely encapsulated in the shell by the cover, so that the motor as a whole is in a metal closed structure. The present application also relates to an automobile seat comprising the above motor. By using the motor according to the present application, electromagnetic radiation of the motor can be more effectively suppressed, and a very high EMC level can be obtained.

This application discloses a floor brush motor with built-in leads and inductors, characterized by comprising: a housing, a rotor rotatably disposed within the housing, an end cover mounted at one end of the housing, an inductor installed within the end cover, a wire harness connected to the end cover, the inductor electrically connected to the wire harness, the inductor electrically connected to the windings in the rotor, the wire harness extending outside the end cover, and a connector provided at the end of the wire harness away from the end cover; by placing the inductor in the end cover, the inductor is located at the source of electromagnetic noise, and when current enters, it first passes through the power supply element and then directly enters the working circuit of the windings, effectively reducing electromagnetic radiation. Simultaneously, the pluggable interface makes wire harness connection faster, more convenient, reliable, and plug-and-play, simplifying the installation process and making disassembly quicker.

The utility model relates to the technical field of car light circuit, specifically disclose a miniaturized integrated car light BUCK circuit, including BUCK IC integrated chip, BUCK IC integrated chip includes VIN pin, EN pin, VOUT pin, FB pin, VCC pin and BST pin, has the first capacitor group and second capacitor group on VIN pin, the first resistance formation POWER IN is connected on EN pin, the voltage -division resistance for voltage division is provided with on FB pin, VOUT pin is connected with third capacitor group, the utility model discloses a purpose at to solve the traditional car light circuit reliability problem through car light BUCK circuit, help system improves stability.

This utility model belongs to the field of lighting technology and discloses a lighting fixture with electromagnetic radiation resistance, including: a light source board, a live wire terminal, a neutral wire terminal, a ground wire terminal, and a surge protection device; the light source board includes: a substrate, a rectifier and filter circuit, a driver circuit, and a string of LED beads; the rectifier and filter circuit, the driver circuit, and the string of LED beads are soldered onto the substrate; the surge protection device is equipped with a surge protection circuit; the live wire terminal, the neutral wire terminal, and the ground wire terminal are respectively connected to the surge protection circuit; the live wire terminal and the neutral wire terminal are used to receive AC power from the outside and transmit the AC power to the rectifier and filter circuit through the surge protection circuit; the rectifier and filter circuit is used to convert the AC power into DC power; the driver circuit is used to convert the DC power into a driving current for driving the string of LED beads. This utility model, by setting up a surge protection circuit and utilizing the circuit structure of the surge protection circuit, reduces the surge effect of the mains power and reduces the electromagnetic radiation caused by surge fluctuations. This improves the stability of the entire lighting fixture.

This invention discloses a high-reliability, high-speed connector and cable assembly. The connector includes a bent socket, which includes a retainer. The retainer includes a plastic base and a bent shield. Several grounding pins are disposed inside the plastic base, and a set of signal pins is disposed between two adjacent grounding pins. Through slots are provided on both sides of the bent grounding pins. L-shaped ground plates are provided on both sides of the bent shield. A straight plug is also included. In the bent socket, the bent shield, together with the grounding pins, forms a C-shaped shield. In the straight plug, the ground plate, together with the bent plate, forms a C-shaped shield. This provides 360° surround electromagnetic shielding for the signal pins or signal plates, significantly reducing crosstalk between adjacent differential pairs, reducing electromagnetic radiation from the signal, and improving immunity to external electromagnetic interference. This effectively solves the signal distortion problem caused by electromagnetic coupling in high-speed signal transmission.