323results about "Screening casings" patented technology

An electronic device is provided, the electronic device includes a primary device assembly and an extension assembly. The primary device assembly includes a first housing and a primary body circuit, the first housing has a first accommodation cavity, and the primary body circuit is disposed in the first accommodation cavity. The extension assembly includes a second housing and an extension circuit. The second housing has a second accommodation cavity, the extension circuit is disposed in the second accommodation cavity, and the extension circuit is signal-connected to the primary body circuit, to extend or enhance functionality of the primary device assembly.

The invention provides a magnetic shielding box for weak magnetic signal measurement and a shielding effectiveness estimation method. The magnetic shielding box comprises a non-magnetic supporting frame and a shielding mechanism. The non-magnetic supporting frame is a cuboid, is at least arranged along the edges of the cuboid and is used for supporting the shielding mechanism, and the interior of the non-magnetic supporting frame is hollow so as to accommodate an object to be detected; the shielding mechanism at least comprises N layers of plate layer structures, plate layer fixing pieces and plate layer supporting pieces; the plate layer structures are sequentially arranged outside the non-magnetic supporting frame in a sleeving mode so as to isolate an external magnetic field of the magnetic shielding box. The plate layer fixing piece sequentially penetrates through all the plate layer structures and is fixedly embedded into the non-magnetic supporting frame. The plate layer supporting pieces are at least arranged between the two adjacent plate layer structures and used for controlling the distance between the two adjacent plate layer structures. N is an integer greater than or equal to 2. The problem of complex manufacturing of the magnetic shielding box can be solved, and the shielding effects of different frequency bands are ensured.

The invention provides a magnetic shielding unit hanging positioning and precision adjusting tool and an installation method. The magnetic shielding unit positioning tool comprises a sleeving shell matched with the outer contour of a base and provided with an opening in the lower portion. A guide channel is formed in the middle of the sleeving shell; a guide structure expanding outwards is formed at the inlet end of the guide channel, and a positioning closing opening for clamping a hook of the magnetic shielding unit is formed at the tail part of the guide structure; the parts, on the two sides of the guide channel, of the sleeving shell are connected. The magnetic shielding unit hanging precision adjusting tool comprises a sleeving frame which is matched with the outer contour of a base and provided with an opening in the lower portion. Two threaded driving units are symmetrically arranged in the middle of the sleeving frame, the axes of the two threaded driving units are parallel, and the ends of the two threaded driving units are oppositely arranged. And an adjusting space for accommodating a hook of the magnetic shielding unit is formed between the two threaded driving units. According to the scheme, rapid hanging mounting is achieved through a horn mouth type guide structure of the positioning tool, and the precision is guaranteed through fine adjustment of double screws of the adjusting tool.

The application relates to the technical field of high-voltage switch cabinets, in particular to a high-voltage switch cabinet convenient to maintain, which comprises a cabinet body and a cabinet door arranged on the cabinet body, a through hole extending along the arrangement direction of the cabinet door and the cabinet body is arranged on the cabinet door, an observation window, a shielding plate with mesh holes and a shielding net are arranged on the cabinet door, the mesh holes of the shielding plate and the shielding net are different in size, the observation window, the shielding net and the shielding plate are sequentially arranged along the arrangement direction of the cabinet door and the cabinet body, and the observation window, the shielding plate and the shielding net are all located on the surface of the cabinet door close to the cabinet body and cover the through hole. The shielding plate with mesh holes and the shielding net are arranged to form a multilayer electromagnetic shielding structure, the shielding plate and the shielding net can filter electromagnetic interference of different frequencies in a synergistic manner, and the electromagnetic compatibility is significantly improved.

The invention discloses an EMC filtering electromagnetic shielding structure which comprises a metal casing, a shielding wall integrally formed with the casing, a cover plate arranged on the casing, a filtering assembly and a main power assembly, the filtering assembly and the main power assembly are arranged in the casing, and a filtering cavity and a main power cavity which are separated by the shielding wall are arranged in the casing. The filtering assembly is arranged in the filtering cavity, the main power assembly is arranged in the main power cavity, and the shielding wall is in interference contact connection with the cover plate. The EMC filtering electromagnetic shielding structure has the advantages of being good in electromagnetic shielding effect and low in cost. The invention further provides a vehicle-mounted charger adopting the EMC filtering electromagnetic shielding structure.

A power supply instrument with a protection structure disclosed by the present invention comprises a power supply instrument body, a protection mechanism is installed on the outer side of the power supply instrument body, the protection mechanism comprises a protection shell, a heat dissipation assembly is installed in the protection shell, a dustproof assembly is installed on the protection shell on the outer side of the heat dissipation assembly, and clamping assemblies are installed on the left side and the right side in the protection shell. The power supply instrument body is arranged between the clamping assemblies on the left side and the right side, the protective shell is provided with supporting sliding assemblies on the two sides of the bottom of the power supply instrument body, the protective shell is provided with a moisture-proof box on the top of the power supply instrument body, a plurality of through holes are formed in the two sides of the moisture-proof box, the moisture-proof box is filled with moisture-proof agents, and assembling frames are installed on the two sides of the protective shell. A cover plate is slidably mounted between the two side assembly frames, and a transparent plate is mounted on the cover plate at a position corresponding to the power supply instrument body.

The invention provides an electromagnetic shielding composite material, a preparation method thereof and an electromagnetic shielding shell structure, and belongs to the technical field of electromagnetic shielding. The electromagnetic shielding composite material is prepared from the following raw materials in percentage by mass: 70 to 85 percent of polymer matrix, 14.8 to 29 percent of modified filler, 0.1 to 0.5 percent of antioxidant and 0.1 to 0.5 percent of lubricant, mixing the graphene composite powder with MXene nanosheets, adding a silane coupling agent and absolute ethyl alcohol, and sequentially performing ultrasonic treatment, drying and sieving with a 100-200-mesh sieve to obtain a modified filler; wherein based on the mass of the graphene composite powder, the MXene nanosheet and the silane coupling agent, the mass percent of the graphene composite powder is 70 to 85 percent, the mass percent of the MXene nanosheet is 14 to 25 percent, and the mass percent of the silane coupling agent is 1 to 5 percent. The electromagnetic shielding composite material provided by the invention has more balanced electromagnetic shielding performance and mechanical performance.

The invention discloses a small-size high-power power supply design method and application based on a planar transformer, and the method comprises the following steps: S1, employing a planar transformer structure comprising at least two layers of PCB windings and a low-loss ferrite magnetic core, enabling the windings to be formed through the etching of PCB copper foils, and enabling the leakage inductance of the adjacent winding layers to be reduced in a staggered stacking manner; s2, the planar transformer is integrated into an LLC resonant half-bridge topology circuit, and soft switching operation of a power supply system under high frequency is achieved by adjusting the primary and secondary turn ratio and resonance parameters of the planar transformer. PCB copper foil etching windings and low-loss ferrite magnetic cores are adopted, leakage inductance is reduced by stacking winding layers in a staggered mode, and the reliability of the power supply system is improved; the planar transformer is combined with laser cutting to precisely control an air gap, so that primary and secondary coupling coefficients are improved to a high coupling state, energy loss is reduced, the size of the transformer is effectively reduced, the planar transformer can be popularized to the fields of industrial power supplies, energy storage systems and the like, and balance of small size and high power is achieved through collaborative optimization of the planar transformer and a topological structure.

The invention discloses an electromagnetic shielding intelligent cabinet with medical drug information monitoring identification, which comprises an electromagnetic shielding metal cabinet body, the front side of the electromagnetic shielding metal cabinet body is hinged with a left cabinet door and a right cabinet door through hinges, and a face identification intelligent electronic lock is arranged between the left cabinet door and the right cabinet door. A medical drug information monitoring and identifying assembly is mounted in the electromagnetic shielding metal cabinet body; the medical drug information monitoring and identifying assembly comprises two mounting cylinders which are fixedly connected to the inner wall of the top and the inner wall of the bottom of the electromagnetic shielding metal cabinet body respectively, a rotating shaft is rotationally connected between the two mounting cylinders, and the shaft wall of the rotating shaft is connected with a plurality of placing frames. According to the invention, the RFID scanning read-write instrument can fully cover the medicines at all positions, so that the RFID scanning read-write instrument can monitor and identify the information of all medicines in the intelligent cabinet, part of medicines can be prevented from being missed in reading, and the accuracy of monitoring and identifying the medicine information by the electromagnetic shielding intelligent cabinet is effectively improved.

Provided is a clamshell housing for a human-machine interface comprising a plastic “C” cover assembly and a plastic “D” cover assembly, the plastic “C” cover assembly comprising a plastic keyboard cover or palm rest, having a plurality of snap fittings thereon for attachment to a plastic “D” cover assembly, a keyboard having a keyboard connector electrically connecting the keyboard to a printed circuit board (PCB), a trackpad having a trackpad connector electrically connecting the trackpad to the printed circuit board (PCB). The housing of the invention may be easily disassembled for repair or recycling.

To provide a method for molding a metal-resin composite material that can suppress springback.SOLUTION: In a method for molding a metal-resin composite material that has a laminated structure in which metal layers and resin layers are alternately laminated, and the laminated structure is asymmetrical, the metal-resin composite material is divided into parts (a) and (b) at half of whole layer thickness, and a total layer thickness of the resin layer in part (a) is Tra, the total layer thickness of the metal layer in part (a) is Tma, the total layer thickness of the resin layer in part (b) is Trb, and the total layer thickness of the metal layer in part (b) is Tmb. If Tma / Tra>Tmb / Trb, molding is performed with the part (a) side placed on a surface to which pressing force is applied. If Tma / Tra<Tmb / Trb, molding is performed by placing the part (b) side on the surface to which pressing force is applied. If Tma / Tra=Tmb / Trb, molding is performed by arranging the side on which the metal layer is located on the surface layer or the side close to the metal layer in the surface layer of the part (a) or (b) on the surface to which pressing force is applied.SELECTED DRAWING: None

The invention relates to the technical field of ultrasonic transducers, in particular to an ultrasonic transducer signal anti-interference transmission method and device, and the device comprises a signal preprocessing unit, an anti-interference unit, an isolation driving unit and a receiving demodulation and decoding unit. The signal preprocessing unit receives the original electric signal and performs differential amplification to generate a differential signal; the anti-interference unit collects the working environment temperature in real time through the temperature monitoring module, the coding strategy selection module and the modulation parameter control module dynamically select and optimize coding rules and adjust modulation parameters according to the working environment temperature, and the signal processing module converts differential signals into digital signals and completes coding modulation. The isolation driving unit performs signal isolation and power amplification; the receiving demodulation and decoding unit demodulates and decodes according to a corresponding rule and restores the ultrasonic signal; according to the invention, the coding rule, the modulation parameter and the heat dissipation strategy are dynamically adapted through temperature monitoring, the high-temperature performance drift of the anti-interference unit is inhibited, and reliable transmission of signals of the ultrasonic transducer is ensured.

The invention relates to the technical field of 5G communication modules, in particular to a compact integrated 5G communication module structure and an assembling method thereof.The compact integrated 5G communication module structure comprises a shielding shell, a sealing upper cover is installed at the upper end of the shielding shell, positioning units are installed at the four corners of the inner side of the shielding shell, and PCB stacking daughter boards and positioning middle frames are installed on the outer sides of the positioning units; the sealing upper cover comprises a plate body, the lower end of the plate body is fixedly connected with a buckle and a positioning ring plate, control grooves are formed in the four corners of the lower end of the plate body, and penetrating holes are formed in the four corners of the plate body. The positioning unit comprises a positioning column, vertical grooves are formed in the two sides of the positioning column, a plurality of fixing mechanisms are installed on the inner sides of the vertical grooves, the inner side of the positioning column is rotationally connected with a driving shaft through a circular plate, and edge grooves are formed in the two sides of the driving shaft. And the problems of contact resistance drift, signal integrity deterioration and creep failure after thermal circulation caused by insufficient pre-tightening of the middle layer are avoided.

A computing device includes: a housing having a plurality of outer walls; a first wireless communications assembly supported within the housing and including a first antenna; a wired communications assembly supported within the housing and including a port on one of the outer walls, the port configured to connect with another device; and a second wireless communications assembly supported within the housing and including a second antenna affixed to an electromagnetic shield disposed adjacent to the port of the wired communications assembly, the electromagnetic shield configured to shield the first antenna from electromagnetic noise generated by the wired communications assembly.

The application relates to a convenient-to-assemble and convenient-to-disassemble millimeter wave shielding box in the field of millimeter wave shielding boxes. The millimeter wave shielding box comprises two end frames, a foldable first connecting frame and a second connecting frame arranged between the two end frames, the first connecting frame and the second connecting frame are arranged on a group of opposite side walls of the end frame, a supporting frame is hingedly arranged on another group of opposite side walls of the two end frames, the supporting frame is used for supporting between the first connecting frame and the second connecting frame, and a wave-absorbing panel is detachably and fixedly connected to the end frame, the first connecting frame, the second connecting frame and the supporting frame, and the wave-absorbing panels can cooperatively enclose a closed box body. The application can simplify the process of building the shielding box and improve construction efficiency.

A method of protecting an RF system from destructive effects of hazardous electromagnetic interference (EMI) comprises separating incoming electromagnetic radiation including hazardous electromagnetic interference according to frequency into low frequency spectral components below a selectable cutoff frequency and high frequency spectral components above the selectable cutoff frequency, and routing the low frequency portion of spectral components which include a vast majority of energy contained in the hazardous electromagnetic interference to ground via a low impedance conductor.

The invention provides a multi-channel power supply system in a self-sustaining energy type underwater closed cabin. The multi-channel power supply system comprises a self-sustaining battery, a power supply control board, an integrated communication circuit, a multi-channel output load circuit, a power supply system external trigger on-off controller and a power supply system external communication interface, the self-sustaining battery is connected with the power supply control board through the onboard rectangular connector; the power supply control board comprises an input connector, a filter circuit, an integrated circuit wall-attached heat conduction shell and an output interface; the integrated communication circuit is arranged on the power supply control board, is connected with an external communication interface of a power supply system and is used for receiving an external trigger instruction and sending internal state information; the power supply system external trigger on-off controller is connected with the integrated communication circuit so as to control on-off of the power supply system based on an external trigger signal; the multi-channel output load circuit comprises a plurality of output channels, each output channel comprises a relay, and the relays are connected with the integrated communication circuit so as to control output on-off based on the internal state information and the external state information.

A battery apparatus includes a casing and at least one first insert disposed on the casing. The first inserts has an electromagnetic shielding layer. The battery apparatus further includes at least one second insert disposed on the casing. The first insert and the second insert are arranged at intervals. The electromagnetic shielding layer of the first insert is electrically connected to the casing through the second insert.

The present invention discloses a prefabricated cabin screen cabinet and an integrated installation module thereof, specifically relating to the field of prefabricated cabin assembly, including prefabricated cabin one and prefabricated cabin two, wherein a connector one is installed on the prefabricated cabin one, and a connector two is installed on the prefabricated cabin two, wherein the connector one is adapted to be connected with a sleeve; the connector one includes a sleeve, which is fixedly mounted on the prefabricated cabin one, wherein a hollow conduit is provided inside the sleeve, wherein a cable is provided inside the conduit, and the cable is used to connect the prefabricated cabin one with the prefabricated cabin two in the same frequency communication, and the conduit is coaxially arranged with the sleeve. The present invention realizes the rapid assembly of the prefabricated cabin one and the prefabricated cabin two by inserting an elastic spiral ring into the gap between the sleeve and the conduit, and the sleeve and the conduit fully cover the cable, thereby meeting the shielding requirements of the cable. Moreover, the connection between the connector one and the connector two is completed inside the sleeve, which can also prevent the connection of the cabin body from being located outside for a long time and being corroded and weathered.

The invention provides an outer contour member, a communication device, a protective case, and a metallic style printing sheet, which can suppress the generation of shielding of radio waves caused by communication and improve the designability of metallic luster hue. A metallic printed sheet (51) is disposed on at least a portion of an outer contour member for a communication device, the outer contour member including a mobile device (1) provided with a communication device and being attached to a protective case of the mobile device (1). The metallic style printing sheet (51) includes a metallic portion provided with a metallic reflective layer and a transmissive portion not provided with a metallic reflective layer when viewed from the front side. The metal reflecting layer is provided with a metal concave curved reflecting surface which is curved in a cross-section in the thickness direction of the metallic style printing sheet. The transmissive portion has radio wave transmissivity that transmits radio waves to the communication device.

The camera module includes: a housing configured to accommodate a lens barrel; a first circuit board disposed under the housing and including a first ground pad; a shield cover configured to cover the housing; a second circuit board disposed on one side surface of the housing and including a second ground pad corresponding to the first ground pad; a first welding portion connecting the first ground pad and the second ground pad; and a second welding portion connecting the shield cover and the second ground pad. The second ground pad includes a first connection portion connected to the first ground pad through a first solder portion and a second connection portion connected to the shield cover through a second solder portion.

A terminal device is provided, including a housing, a circuit board, a heat generation component, an air duct, a heat dissipation member, and a fan apparatus. The housing is provided with an air inlet hole and an air outlet hole. The circuit board is disposed in the housing. The heat generation component is disposed on the circuit board. The air duct is disposed between the housing and the circuit board. The air duct includes an air inlet and an air outlet. The air inlet communicates with the air inlet hole. The air outlet communicates with the air outlet hole. The heat dissipation member is disposed at a position that is in the air duct and that is close to the air outlet, to receive heat conducted by the heat generation component. The fan apparatus is disposed at a position that is in the air duct and that is close to the air inlet, to guide an airflow to the heat dissipation member, so that heat of the heat dissipation member is dissipated to an exterior of the housing sequentially through the air outlet and the air outlet hole via the airflow. In this application, a heat dissipation system including the heat dissipation member, the fan apparatus, the air duct, and the like is disposed inside the terminal device. This can implement active heat dissipation to achieve efficient cooling of the heat generation component, thereby enabling the terminal device to achieve good performance during running in a high-load scenario.

The present disclosure relates to a shield box for testing a mobile telecommunication terminal in which an increase in temperature in a shield box is prevented in performing various tests on a mobile telecommunication terminal having multiple antennas in an Over The Air (OTA) method to perform a stable test. The shield box for testing a communication terminal of the present disclosure includes a shield box main body (180) made of metal, having a jig entrance (180a) formed on the front side, and equipped with a vent (120b, 160a) which a plurality of vent holes of 1 to 10 mm in size are formed on the upper and rear sides, respectively; a test jig assembly (200) installed to be able to enter and exit through the jig entrance (180a) while mounting a PCB for non-contact wireless connection in which a plurality of non-contact wireless connection parts that are wirelessly connected to a mobile telecommunication terminal and transmit and receive signals are arranged; and a ventilation fan mounted on the upper vent or the rear vent.

The invention discloses a precision measurement circuit protection method and device, and the method comprises the following steps: providing an electromagnetic shielding housing which is provided with an accommodation cavity for accommodating a precision measurement circuit; a phase-change material layer is arranged on the inner wall of the accommodating cavity, and the phase-change temperature of the phase-change material is in a normal working temperature interval of the precision measurement circuit; the precision measurement circuit is arranged in the accommodating cavity and is connected with a uniform temperature plate through a heat-conducting medium layer, so that heat generated by the precision measurement circuit can be transmitted to the uniform temperature plate through the heat-conducting medium layer; a temperature detection control unit is arranged and used for detecting the temperature of the vapor chamber in real time; and when the temperature of the uniform temperature plate exceeds a preset threshold value, a temperature control execution mechanism is started to carry out active temperature adjustment on the uniform temperature plate.

The invention provides a highly integrated power semiconductor device, and belongs to the technical field of semiconductor devices. The problems that in the prior art, comprehensive consideration of a current loop, power loss and heat management is lacked, and the assembling and connecting strength is insufficient are solved. The highly-integrated power semiconductor device comprises a shell, a substrate, a plurality of loop modules arranged on the substrate and adopting upper and lower bridge design, a plurality of positioning holes arranged on the substrate, and a positioning piece, the lower part of the positioning piece is fixedly connected with the positioning holes, the upper part of the positioning piece is higher than the substrate, and the positioning piece is internally through and is provided with an internal thread. According to the scheme, the circuit layout is optimized, the energy efficiency and heat dissipation are improved, the electromagnetic interference is reduced, the integration level is higher, the overall size is reduced, the material cost is remarkably reduced, the structure is simple, production and assembly are more convenient, and the structural stability is enhanced while the assembly efficiency is improved.

The embodiment of the invention provides a noise reduction device, and relates to the technical field of vehicles, the device comprises a shell and a function part; wherein the shell is made of an electromagnetic shielding material, an inner cavity of the shell is used for containing the high-voltage wire, and the high-voltage wire is used for transmitting electric energy in a vehicle; a function part is attached to the inner wall of the inner cavity and used for absorbing force generated by vibration of the high-voltage wire. Based on the device, the shell made of the electromagnetic shielding material is used for containing the high-voltage wire, electromagnetic radiation generated by the high-voltage wire in the electric energy transmission process is effectively shielded, and vibration noise generated when the electromagnetic radiation acts on parts outside the high-voltage wire is restrained. In addition, vibration of the high-voltage wire in the electric energy transmission process is absorbed through the function part, so that vibration of other parts in contact with the high-voltage wire driven by the high-voltage wire is effectively inhibited, and vibration noise of the whole vehicle is further reduced. The embodiment provided by the invention can be applied to intelligent automobiles or new energy automobiles.

Disclosed is a display device mounted in a vehicle including a display panel, a fixing plate surrounding side surfaces and a rear surface of the display panel and having an opening defined therein, a printed circuit board connected to the display panel and located in the opening, and a back cover covering the fixing plate and the printed circuit board and made of a conductive material, wherein the back cover includes a first protrusion in contact with the printed circuit board. The display device reduces EMI noise caused by electromagnetic waves emitted between electronic components mounted on the printed circuit board via the back cover made of the conductive material.

A control assembly for a vehicle position lamp is provided, including: a lighting device and a sensing unit. The lighting device includes at least one lighting member and a control module connected with the at least one lighting member. The sensing unit is connected with the control module and is configured to sense an external environment and generate a sensing signal. The control module receives the sensing signal and adjusts a brightness of the at least one lighting member accordingly.

The invention discloses a magnetic shielding assembly and a magnetic shielding system, and relates to the technical field of magnetic shielding, the magnetic shielding assembly comprises a magnetic shielding carrier, and the bottom of the magnetic shielding carrier supports a movable wheel; the magnetic shielding cover shell is movably arranged above the magnetic shielding carrier, and a shielding space is formed in the magnetic shielding cover shell; and the shielding coil structure is arranged in the shielding space and can move relative to the magnetic shielding cover shell. According to the magnetic shielding assembly, different magnetic field environments can be shielded, shielding optimization of the different magnetic field environments is achieved, the optimal magnetic field shielding effect is achieved, the working efficiency is greatly improved, operation is convenient, and damage to the human body is reduced.

The invention relates to the technical field of power supply filtering, and discloses a power supply filter with a signal masking function, which comprises a shell module for packaging each functional module and providing electromagnetic shielding; the passive filtering module performs primary filtering on a power supply signal to reduce low-frequency and intermediate-frequency noise; the signal sampling and spectrum analysis module samples and analyzes the frequency domain characteristics of the power supply signal, and extracts a target frequency band signal; the abnormal signal identification module identifies and judges abnormal coupling signals; the interference signal generation module generates a masking signal to suppress an abnormal signal; the closed-loop feedback control module adjusts parameters of the passive filtering and interference signal generation module in real time; and the output and verification module outputs and verifies the processed signal effect. The closed-loop feedback control technology is adopted, the technical effect of optimizing the system performance is achieved by monitoring the working state of the system in real time and dynamically adjusting the parameters of the filter and the interference signal module, and the defect that a traditional method cannot adapt to different working conditions in real time is overcome.