49results about How to "Guaranteed Electromagnetic Compatibility" patented technology

The invention provides an on-board electronic cabinet applied to the technical field of aviation electronic products. A front panel (1), a rear cover plate (2), an upper cover plate (3), a base plate (4), a left side plate (5) and a right side plate (6) of the on-board electronic cabinet form a hollow square frame structure. The inner surfaces of the front panel (1), the rear cover plate (2), the upper cover plate (3), the base plate (4), the left side plate (5) and the right side plate (6) are respectively provided with an oxidation layer (7) which is formed through conductive oxidation treatment. The outer surfaces of the front panel (1), the rear cover plate (2), the upper cover plate (3), the base plate (4), the left side plate (5) and the right side plate (6) are respectively coated with an enamel paint layer (8). According to the on-board electronic cabinet, the structure is simple, the electromagnetic compatibility is guaranteed, the resistance to electromagnetic interference is improved, the heat dissipation effect is improved, it is guaranteed that the on-board electronic cabinet can be operated under severe flight conditions, and work reliability and the adaptability of the on-board electronic cabinet and an airplane where the on-board electronic cabinet is carried are improved.

The invention relates to a multi-channel compound heat radiating sealing chassis which is characterized in that outer sealing plates are arranged on two sides of a chassis frame, an upper cover plate and a lower cover plate are arranged on and under the chassis frame, two ends of the chassis frame are provided with a front panel and a rear sealing plate, a fan is arranged on the rear sealing plate, a connector frame is arranged inside the chassis frame, a separation plate for separating a strong current region and a weak current region is arranged on the connector frame, a side wall heat radiating fin is arranged on the connector frame in the strong current region, an installing plate is arranged on one side of the weak current region, which is positioned on the rear sealing plate, an inner fan is arranged on the installing plate, an inner separation plate is arranged between the inner fan and the rear sealing plate, heat radiating fins are arranged on two ends of the inner separating plate; and two side surface heat exchange plates are arranged on two sides of the chassis frame and positioned between the chassis frame and the outer sealing plates. According to the invention, by adopting a method of combining conduction with secondary forced heat radiation, the problem of heat radiation of a high-density and large-power sealing electronic device can be effectively solved.

The invention relates to a tail clamping and locking mechanism of a low-frequency electric connector, comprising a protective line sleeve and a cable cover, wherein the protective line sleeve is connected with a plug or a socket of the electric connector; the cable cover is matched with the protective line sleeve and locks a cable; a contact line of the cable is welded with a pin of the plug or the socket connected with the protective line sleeve; two or more line clamping lamellas with excircle surfaces as conical surfaces are arranged between the protective line sleeve and the cable cover, and the excircle conical surfaces of the two or more line clamping lamellas face to the protective line sleeve or the cable cover and are in a symmetrical or uniformly distributing cable clamping state. The invention has the advantages of large line clamping area, high friction force between the line clamping lamellas and the cable, drag resistance and high twisting resistance; in addition, the line clamping lamellas can meet the requirement for clamping cables with large diameter differences according to the diameter design of the cables without deformation when used for a long time, is difficult to damage cable surface layers and shielding layers and has the advantages of convenient assembly and disassembly, repeated use, low cost and long service life.

The invention discloses a pure electric automobile energy system structure and a vehicle energy storage control system thereof, wherein the energy system structure comprises a first charging plug and a second charging plug, wherein the first charging plug is connected with a first battery pack, while the second charging plug is connected with a second battery pack; and the first battery pack and the second battery pack are respectively composed of a plurality of batteries connected in series. The energy system structure is characterized in that each battery pack is controlled by controlling a power device with a one-way / two-way switch, so that battery packs discharge simultaneously, and the discharge processes of the battery packs are independent with one another without causing reverse charging; and the discharge of one or more battery packs can be realized by controlling the power device by using an entire vehicle electric control unit; and therefore, an individual battery of each battery pack are monitored. Furthermore, the pure electric automobile energy system structure maximally reduces the charging time, reduces the charging current, and prolongs the service life of an entire vehicle high voltage power consuming component and the service life of each battery pack; and the structure is capable of reducing the entire vehicle voltage so as to guarantee the electromagnetic compatibility of an entire vehicle; and as a result, the electric control technical level of the entire vehicle is greatly improved.

An electronic endoscope (1) is provided with the following: a plurality of metal cylinder members (51, 55, 59, 63) that are connected by electrical conduction so as to electromagnetically shield an internal space formed in an insertion part (2); a treatment tool channel (48) in which the center (O1) is disposed in any one quadrant of an orthogonal coordinate system with the origin thereof being the center (O) of the insertion part (2); and a plurality of small signal cables (31, 32, 33) that extend from an image pickup unit (30) and that have disposed therein, within at least a curved section (7), centers (O2, O3, O4) in quadrants that are different from the above any one quadrant and that are divided from that one quadrant at one axis (Y) of an orthogonal coordinate system which follows the curving vertical direction of the curved section (7). By being provided with the foregoing, the electronic endoscope can secure electromagnetic compatibility (EMC) and make the diameter of the insertion part smaller by efficiently disposing the plurality of cables so that the cables do not buckle within the curved part.

The invention discloses a missile-borne high-speed backplane based on a VPX standard. The backplane comprises a PCB provided with a signal layer, a power layer and a plane layer; a first power connector and a second power connector which are used for providing power input of an external power system are fixed to the PCB; a plurality of module groove positions are further fixed to the PCB; the intervals between the module groove positions are 25.4 mm of the VPX standard; and the module groove positions are in communication with an external device through a reinforced mixed installation type electric connector. The scheme has the beneficial effects that the assembly complexity is low, signal transmission is high in speed and stable, extending and upgrading are easy and convenient, reliability is high, and cost is low, and is applicable to missiles designed to be integrated, universal and small.

The invention discloses a contactless online testing device for an input impedance at each position of a printed circuit board. The device comprises a mechanical scanning holder, a mechanical controlmodule, a microminiature near field signal sensor, a signal obtaining module, a signal analysis module, a display module, a storage module and a power module. Through utilization of the microminiaturenear field signal sensor and the signal obtaining module, near field magnetic field signals around input or output signal lines of a chip, a component and a circuit module at each position of a tested printed circuit board are coupled and obtained. Through utilization of the signal analysis module, the signals are processed, and the input impedances of the chip, the component and the circuit module at each position of the tested printed circuit board are solved, and corresponding amplitude frequency and phase frequency information is output. According to the device, through adoption of the contactless microminiature near field signal sensor, influence on a working state of the printed circuit board is low. The device is applicable to online testing of the input impedances of the chip, thecomponent and the circuit module at each position of the printed circuit board.

The invention discloses a communication antenna and a mounting and detaching method therefor. The communication antenna comprises a mounting base, a back cavity, a microstrip antenna and a radio frequency cable assembly; the mounting base is used for being pasted and fixed in the position of an internal window of a carrying platform, and the back cavity is fixed in the mounting base; one end of a core wire of the radio frequency cable assembly is mounted on a conductive bottom plate of the back cavity while the other end of the core wire is connected with a feed point of the microstrip antenna; a radio frequency cable shielding layer is grounded; a microstrip antenna is fixedly connected with the conductive bottom plate of the back cavity; and the height between the conductive bottom plate and the mounting base is adjustable. The communication antenna provided by the invention is free of transformation on the mounting platform, capable of being mounted and detached rapidly and high in imperceptibility; the communication antenna can be rapidly mounted in a traceless manner when a temporary task is executed; the original shape can be recovered rapidly in retraction, so that high imperceptibility is realized; and meanwhile, electromagnetic interference to other electronic equipment in the platform can be avoided in operation, and electromagnetic compatibility to the equipment is also achieved.

The invention discloses a dual-channel transmitting assembly for a phased array antenna of a carrier rocket relay user terminal, which includes a first channel radio frequency circuit and a second channel radio frequency circuit; the first channel radio frequency circuit includes: a sequentially connected second channel radio frequency circuit A digitally controlled phase shifter for one channel, a driving amplifier for the first channel, a power amplifier for the first channel, a microstrip directional coupler for the first channel, a single-section isolator for the first channel, and a first channel connected to the microstrip directional coupler for the first channel channel detection diode; the second channel radio frequency circuit includes: a second channel digitally controlled phase shifter, a second channel drive amplifier, a second channel power amplifier, a second channel microstrip directional coupler, a second channel A single-section isolator, and a second-channel detection diode connected to the second-channel microstrip directional coupler. Compared with the single-channel phase-shifting transmitting assembly, the present invention has a compact structure, which is beneficial to reducing the front area of ​​the phased array antenna and reducing the weight of the whole machine of the phased array antenna.

The invention relates to a multi-channel compound heat radiating sealing chassis which is characterized in that outer sealing plates are arranged on two sides of a chassis frame, an upper cover plate and a lower cover plate are arranged on and under the chassis frame, two ends of the chassis frame are provided with a front panel and a rear sealing plate, a fan is arranged on the rear sealing plate, a connector frame is arranged inside the chassis frame, a separation plate for separating a strong current region and a weak current region is arranged on the connector frame, a side wall heat radiating fin is arranged on the connector frame in the strong current region, an installing plate is arranged on one side of the weak current region, which is positioned on the rear sealing plate, an inner fan is arranged on the installing plate, an inner separation plate is arranged between the inner fan and the rear sealing plate, heat radiating fins are arranged on two ends of the inner separating plate; and two side surface heat exchange plates are arranged on two sides of the chassis frame and positioned between the chassis frame and the outer sealing plates. According to the invention, by adopting a method of combining conduction with secondary forced heat radiation, the problem of heat radiation of a high-density and large-power sealing electronic device can be effectively solved.

The invention relates to an intelligent type low-voltage in-set draw-out switch device and an anti-interference signal dynamic and static plugins thereof. The dynamic and static plugins are respectively provided with two or multiple signal dynamic or static plug-in pieces and one grounding dynamic and static plug-in piece; the dynamic and static plugins are respectively provided with an insulation shell and a metal shielding body and are respectively in contact with the metal shielding body through a grounding connection post through each grounding plug-in piece of the dynamic and static plugins, and the grounding continuity of signal dynamic and static plugin bodies can be realized; signal dynamic plugins are arranged on a drawer unit, signal static plugins are arranged on a cabinet body, and connection, test and disconnection are realized through a drawer pushing and interlocking mechanism. According to the intelligent type low-voltage in-set draw-out switch device disclosed by the invention, the anti-interference capacity of signal transmission of the signal dynamic and static plugins in connection application is greatly increased, quick connection is realized, the operability and the electromagnetic compatibility of the intelligent type low-voltage in-set draw-out switch device and the reliability of an anti-interference signal transmission application function are increased.

The invention discloses a dust-proof device, which comprises a chassis panel, on which a heat dissipation hole of the chassis is arranged for heat dissipation of the chassis; The overturning of the overturning component seals or opens the opening of the heat dissipation hole; and the dustproof part is arranged in the overturning component. The beneficial effects of the present invention are as follows: one is to adopt the structure that a rotary spring is arranged between the rotating shaft and the dust-proof mesh, which is convenient for opening and closing, and is convenient for maintenance. It is made of metal, which can ensure the electromagnetic compatibility performance of the chassis; the third is to properly set up cooling holes, which can not only ensure the heat dissipation requirements, but also ensure the electromagnetic shielding performance of the chassis.

The invention provides a power assembly, and the power assembly comprises a power supply control conversion circuit, a grid voltage protection circuit and a radio frequency power amplification circuit; the input end of the power supply control conversion circuit is an external power supply port of the power assembly, and the output end comprises a low-voltage output end and a high-voltage output end; the input end of the grid voltage protection circuit is connected with the high-voltage output end of the power supply control conversion circuit; the input end of the radio frequency power amplification circuit comprises a voltage input end and a radio frequency signal input end, wherein the voltage input end is respectively connected with the low-voltage output end of the power supply control conversion circuit and the output end of the grid voltage protection circuit. Through the power supply control conversion circuit, the grid voltage protection circuit and the radio frequency power amplification circuit and reasonable layout design, the size of the assembly is reduced, the electromagnetic compatibility and anti-interference performance of the power assembly are ensured, and the output power is high and adjustable; and various performance indexes of the power assembly in electrical, mechanical and thermal aspects are ensured.

The invention discloses a front-end digitallizer based on an FPGA. The front-end digitallizer comprises a digital front end and an analytical back end, wherein the digital front end is connected to the analytical back end; the digital front end is used for collection, pre-processing, storage and transmission of a spatial electromagnetic signal, packaging an original spatial electromagnetic signal and feature value data into a data frame and transmitting the data frame to the analytical back end; and the analytical back end is used for receiving and analyzing the data frame sent by the digital front end, carrying out data post-processing on the data frame and providing interface management. The device has strong electromagnetic compatibility, and measurement capability of characteristic parameters of the spatial electromagnetic signal of heavy sensitive equipment can be improved.

The invention discloses an electromagnetic compatibility shielding chamber of a KVM all-in-one machine, and specifically relates to the technical field of testing. The electromagnetic compatibility shielding chamber of the KVM all-in-one machine includes a cavity surrounded by an upper cover and a lower cover. The side walls of the upper cover and the lower cover are connected by connecting bars. The outer surface of the connection between the connecting strip and the upper cover and the lower cover is coated with copper foil. foil, and a conductive cloth pad is also pasted on the side wall of the head end of the cavity.

The invention relates to a filtering assembly, which comprises a filtering circuit board, a casing with a chamber, and a cover plate. A shielding plate is arranged in the chamber of the casing, and the shielding plate divides the chamber into left and right chambers. The filtering circuit board Fixed in the left chamber, the filter circuit board is installed with a filter circuit, the right chamber is equipped with a power conversion component, the input end of the filter circuit board is welded with an input lead, the output end of the filter circuit board is connected to the input end of the power conversion component, and the power supply Output leads are welded at the output end of the transformation component, and insulators are respectively arranged on the left and right side walls of the housing, and the insulators are fixed on the side walls of the housing, and the input and output leads pass through the insulators. The invention has the advantages of good shielding effect, high integration, small volume and strong anti-electromagnetic interference ability, improves the stability of the output voltage of the power conversion part, and ensures that the electromagnetic compatibility of the power conversion part meets the requirements of GJB.

The invention discloses a contactless online testing device for an input impedance at each position of a printed circuit board. The device comprises a mechanical scanning holder, a mechanical controlmodule, a microminiature near field signal sensor, a signal obtaining module, a signal analysis module, a display module, a storage module and a power module. Through utilization of the microminiaturenear field signal sensor and the signal obtaining module, near field magnetic field signals around input or output signal lines of a chip, a component and a circuit module at each position of a tested printed circuit board are coupled and obtained. Through utilization of the signal analysis module, the signals are processed, and the input impedances of the chip, the component and the circuit module at each position of the tested printed circuit board are solved, and corresponding amplitude frequency and phase frequency information is output. According to the device, through adoption of the contactless microminiature near field signal sensor, influence on a working state of the printed circuit board is low. The device is applicable to online testing of the input impedances of the chip, thecomponent and the circuit module at each position of the printed circuit board.

The invention relates to a prediction analysis system and method for EMC (Electro Magnetic Compatibility) in a system. The prediction analysis system comprises two main parts, namely a first part and a second part, wherein the first part is an input and initialization part and mainly completes input of predictive parameters, generation of spectrum data and files in the system and establishment of cable topological graphs; the second part is a prediction task analysis module and is mainly combined with a series of data files generated by an input and initialization module to complete generation of an EMC index and EMI(Electro Magnetic Interference)evaluation and analysis functions. The prediction analysis system for EMC breaks the technological monopoly, and the invention provides the new system and method to enable the EMC analysis of equipment to be more convenient. The prediction analysis method for EMC ensures EMC as much as possible in the whole research cycle and even the whole life cycle of the system. The EMI evaluation and trade-off analysis of the system are realized in the research cycle of the system, an economic and effective technological means is provided in the overall life cycle of the system, and the EMC of the system is most likely realized.