47results about How to "Improve the electromagnetic environment" patented technology

The invention relates to the technical field of the terminal LCD (Liquid Crystal Display) screens and in particular relates to an interference debugging method for a terminal LCD bright screen. The interference debugging method comprises detecting an LCD clock frequency and obtaining a harmonic frequency corresponding to the LCD clock frequency, and if any harmonic frequency falls into a preset receiving frequency band of radio-frequency receiving of a terminal, calculating the optimal LCD clock frequency according to the harmonic theory so that the any harmonic frequency falls beyond the preset receiving frequency band and adjusting the LCD clock frequency to the optimal LCD clock frequency. The debugging method is capable of quickly obtaining the position relationship of the harmonic frequency corresponding to the LCD clock frequency to the radio-frequency receiving frequency band of the terminal, and obtaining the optimal LCD clock frequency enabling the harmonic frequency to fall beyond the preset receiving frequency band by virtue of simple calculation, and therefore, the debugging time of the interference of the terminal LCD bright screen is greatly shortened, an electromagnetic environment is effectively optimized and mutual interference phenomena are reduced.

The invention discloses a series-connected bridge-type impedance network power converter. The series-connected bridge-type impedance network power converter is formed by connecting a first inductor (L1), a first capacitor (C1), a second inductor (L2) and a second capacitor (C2) in series from end to end in turn. A two-way switch (33) is diagonally connected to two connecting points (A and B) of a bridge-type impedance network (12); the input node (P1) of the bridge-type impedance network (12) is connected with the positive electrode of an input side power converter (11); the output node (P2) is connected with the positive electrode of an output side power converter (22); and the negative electrode of the input side power converter (11) is connected with the negative electrode of the output side power converter (22). A load (20) is connected with the middle point of a bridge arm of the output side power converter (22); and a power supply (10) is connected with the middle point of the bridge arm of the input side power converter (11). Different conversion aims can be realized by controlling the topology structure of a bridge through the two-way switch (33).

The invention discloses a carrier face wireless ultraviolet light unmanned aerial vehicle landing assisting system which comprises an information processing center. The information processing center is connected with receiving and sending integrated devices, environmental sensors and state sensors. The receiving and sending integrated devices are installed at the corners of a deck landing allowingarea and the bottom of an unmanned aerial vehicle. The invention further discloses a carrier face wireless ultraviolet light unmanned aerial vehicle landing assisting guide method. The problems thatan existing unmanned aerial vehicle landing assisting system is greatly influenced by the climatic environment, the successful carrier landing rate is low, electromagnetic interference exists, and equipment is complex are solved.

The invention provides a calculation and optimization method for a high-voltage alternating current / direct current parallel line mixed electric field. The method comprises the following steps that: determining the relevant information of a high-voltage alternating current / direct current parallel line, and constructing a two-dimensional mixed electric field calculation model according to the relevant information; aiming the voltage class of a corresponding high-voltage alternating current / direct current power transmission circuit and an interval space between an alternating current circuit anda direct current circuit, adopting a meshfree method to carry out a solving operation on a calculation model to obtain mixed electric field intensity when the high-voltage alternating current / direct current is parallel, and changing the height and the parallel interval of the circuit; and obtaining an optimal mixed electric field environment. When the method is implemented, the high-voltage alternating current / direct current parallel line mixed electric field can be predicted, the height and the interval distance of the high-voltage alternating current / direct circuit can be analyzed and regulated so as to lower the mixed electric field intensity of the high-voltage alternating current / direct current power transmission circuit, and a purpose that the electromagnetic environment of the high-voltage alternating current / direct current parallel line is optimized is achieved.

The invention relates to a design method for selecting an installation position of shared iron tower communication equipment. The method comprises the steps of: enabling computer equipment and programs to be used for operation, using an electromagnetic environment simulating model at least once to perform simulation calculation analysis of the preliminarily determined electromagnetic environmentdata of the communication equipment at the installation position of the shared iron tower to generate communication performance index data, and comparing the communication performance index data withthe communication equipment and a human body electromagnetic environment threshold to obtain an accurate and safe installation position of the communication equipment on the shared iron tower. The invention relates to an optimal design method for selecting the installation position of communication equipment of a shared iron tower, which has stronger systematicness and universality, can save design resources and time cost, can meet the performance requirements of the communication equipment and power equipment on the shared iron tower, and ensures that the working environment of the shared equipment meets the requirements of electromagnetic environment, electrical safety distance and the like.

The invention discloses a precision-location stepping motor for a micro-stepping instrument, which comprises a shell upper cover (1), a shell lower cover (2), a permanent magnet rotor (3), a primary transmission gear set driven wheel (5), a secondary transmission gear set driving wheel (6), a primary transmission gear set driven wheel rotary shaft (7), a secondary transmission gear set driven wheel (8), a three-level transmission gear set driving wheel (9), a three-level transmission gear set driven wheel (11), a pointer drive shaft (12), an excitation winding coil XA (13), an excitation winding coil XB (14), a coil pin A (15), a coil pin B (16), a coil pin C (17), coil pin D (18), a stator iron core body (19) and the like. The reduction ratio of a three-level reduction gear system is 720:1, and the minimum location resolution is 0.0833 degrees; and the invention realizes micro-stepping rotation on the aspect of structure, does not need an extra drive circuit when in use and is a stepping motor for the instrument ,which has precision location and can enable a point to smoothly move.

The invention discloses an offset-adaptive reconfigurable wireless power transmission system. The offset-adaptive reconfigurable wireless power transmission system is characterized in that P coils composed of a flux tube are symmetrically disposed in a coil loop gap of a double D transmitting coil, and when the position of the transmitting coil and the position of a receiving coil offset, the number of the switched P coil pairs and the position of the switched P coils are controlled so as to perform compensation of mutual inductance of the transmitting coil and the receiving coil. The offset-adaptive reconfigurable wireless power transmission system compensates the mutual inductance value when the position of the transmitting coil and the position of the receiving coil offset, ensures theconstant output current, improves the energy transmission efficiency when the position of the transmitting coil and the position of the receiving coil offset, and improves the electromagnetic environment when the position of the transmitting coil and the position of the receiving coil offset.

The invention relates to a magnetic isolation type multi-circuit synchronous trigger circuit with negative voltage bias. The multi-circuit synchronous trigger circuit comprises a primary side drivingcircuit used for generating positive and negative dual-polarity pulse signals, a magnetic isolation transformer, secondary side driving control modules and a plurality of controlled semiconductor switches; and the primary side coil of the magnetic isolation transformer is connected with the primary side driving circuit while the secondary side coil generates synchronous driving signals of different time sequences through the multiple secondary side driving control modules to drive the controlled semiconductor switches. Compared with the prior art, the multi-circuit synchronous trigger circuithas the advantages of improving of driving efficiency, lowering of complexity, providing of negative voltage bias and the like.

The invention relates to an electromagnetic charging magnetic rail of a mobile electromagnetic charging station. The electromagnetic charging magnetic rail comprises an electromagnetic charging winding, an electromagnetic charging magnetizer, presser feet, pressing plates, clamping and pressing bolts and magnetic rails and the like. The electromagnetic charging winding as a main component is similar to a primary winding of a transformer and is installed on the electromagnetic charging magnetizer that is connected with the magnetic rails. Because the magnetic rails, which are long, have electromagnetism by introduction and can carry out multiphase operation, a charging magnetizer can be operated for a long time. A charging coil generates secondary currents that are sent to a charging device, so that an electric vehicle that is charged by electromagnetic charging can be driven and charged simultaneously during the vehicle moving process. Therefore, problems that electric power storage and continuous moving capabilities of the present electric vehicle are poor can be solved, thereby ensuring reliable operation of the electric vehicle and improving the practicability and commercial value of the electric vehicle.

The invention discloses a ground train transient impulse interference field intensity analysis system. The system comprises an impulse interference capture module used for capturing impulse interference information of a steel rail on a railway or other interference transmission routes in real time, a frequency domain analysis module used for receiving the impulse interference information and analyzing the frequency domain of the impulse interference information, a time domain analysis module used for analyzing the time domain of a frequency domain analysis result, and a transient interference analysis module used for conducting transient interference analysis according to the frequency domain analysis result and a time domain analysis result. By the adoption of the system, a tester can completely master the characteristics of the time domain and the frequency domain of transient interference generated in the running process of a train, influences generated by the interference on related equipment of a railway signal system can be further analyzed, effective signal equipment anti-interference protective measures are provided, the electromagnetic environment of the signal system is improved, and it is guaranteed that the functions of the signal equipment are normal.

The invention relates to a filter of an impulse power output port of motor speed controllers. The filter comprises a passive filter circuit and whole shielding of the circuit, and the filter is characterized in that the passive filter circuit is an interference reflection circuit which is fixed in a shielding casing, and the interference reflection circuit is formed by a first common mode inductor and a second common mode inductor which are provided with same winding numbers and connected through a tandem connection line. The filter can be suitable to power output ends of the motor speed controllers in different types, protects winding insulation of a motor of servo systems in different types, simultaneously restrains conducted interference of a power output line of the motor speed controller, effectively reduces radiated interference of the servo system, and greatly improves an electromagnetic environment of site sensitive equipment.

The invention discloses a signal conditioning board with an electromagnetic shielding function, which comprises a circuit board which is designed by adopting the appearance of a PCI (peripheral component interconnect) board and a shielded enclosure, wherein the circuit board adopts an electromagnetic compatibility processing mode of a conventional circuit, and the shielded enclosure comprises a front cover plate, a rear cover plate and a baffle plate. According to the signal conditioning board, a signal conditioning circuit in a target simulator is designed into a circuit board with the appearance of the standard PCI board, the shielded enclosure is added on the whole circuit board, therefore, the electromagnetic environment of the signal conditioning board in an industrial personal computer is effectively improved, and the equipment failure caused by a weak signal interfered by other electrical signal in the industrial personal computer is avoided. The signal conditioning board is fixed in a PCI groove in the standard industrial personal computer by using the fixed mode of the PCI board, the power supply of the industrial personal computer is directly used to supply power for the signal conditioning board, the whole signal conditioning board meets the installation requirement of the standard industrial personal computer (40 cm * 30cm * 25cm), so that the portable and integrated design of the equipment is realized, and the signal conditioning board is compact in structure, small and light and convenient to carry and used in different places.

The invention aims at providing an ultra wideband antenna integrated with a stepped impedance tuning bar; the ultra wideband antenna comprises a medium base plate, a radiating element, a stepped impedance tuning bar, a coplanar waveguide feed signal strip line and a coplanar waveguide ground plane, wherein the radiating element, the stepped impedance tuning bar, the coplanar waveguide feed signal strip line and the coplanar waveguide ground plane are arranged on the medium base plate; the coplanar waveguide feed signal strip line and the coplanar waveguide ground plane form a coplanar waveguide feed structure; the radiating element is arranged in the coplanar waveguide ground plane; the radiating element and the coplanar waveguide ground plane form a wide groove structure; and the stepped impedance tuning bar comprises a first stepped impedance tuning bar and a second stepped impedance tuning bar, wherein the first stepped impedance tuning bar is integrated on the radiating element, and the stepped impedance tuning bar is integrated on the coplanar waveguide ground plane. According to the ultra wideband antenna, the mutual interference between an ultra wideband communication system and the traditional narrowband system can be reduced, and the cooperative communication between the two systems is realized.

The invention relates to a 550 kN trigeminy V-shaped pendent insulator string form, at a unilateral side, a single iron tower hanging point is adopted to be connected with the trigeminy 550 kN pendent insulator string, and the hanging point and the insulator string are connected in parallel to form a V-shaped string structure through multiple high-strength connecting armor clamps, and then the structure is connected with a cable clamp hanging plate to form a pendent single-hanging point trigeminy V-shaped 550 kN pendent insulator string form. The string adopts trigeminy 550 kN insulators for parallel connection at each side, has the high strength of 1650 kN, is more reliable and wide in application range, and the requirement of a UHV direct-current transmission line heavy ice area on the strength of the pendent insulator string is met.

The invention relates to a modular unit based on a modular multi-level voltage source converter, which is characterized by comprising two side supports (1), submodules (2), a transverse beam (3), a communication line (4), a cooling water pipeline (5) and a shielding cover (6); the two side supports (1) are positioned at two ends of the module unit; the transverse beam (3) is laid between the two side supports (1), and a plurality of independent submodules (2) are mounted on the transverse beam; the modular unit is easy to expand so as to obtain the converter with higher voltage and larger capacity; the modular unit is a basically independent module, and integrates the submodules, a cooling system, a communication system and a shielding system; and the modular unit is the basically independent module integrating the submodules, the cooling water pipeline, the communication line and the shielding cover, and is a complete expandable unit.

The invention relates to a conductor configuration method for a direct current power transmission circuit; electrode conductors of the direct current power transmission circuit are vertically configured by utilizing an F tower; and the conductor configuration method is characterized in that the configuration manner of the electrode conductors on the F tower is positive electrode at the upper part and negative electrode at the lower part. By the comparison of experimental data obtained from computation and experiments, the method is proven to have relatively high accuracy, be applicable to shrunk corridor for direct current power transmission in the future and improve the total electric field of the power transmission circuit.

The invention provides a power-frequency electric field optimization method for a series reactor region of a 500kV transformer substation, and the method comprises the steps: determining the related information of the series reactor region of the 500kV transformer substation, and constructing a calculation model according to the related information; employing a boundary element method to carry out the simulation solving of the calculation model for each phase sequence array in the range of a preset double-circuit bus phase sequence array, obtaining the power-frequency electric field intensities which are respectively corresponding to each phase sequence array, and screening out the power-frequency electric field intensities meeting a certain condition, and the corresponding phase sequence arrays; obtaining the current phase sequence array of a double-circuit bus of the series reactor region of the 500kV transformer substation, and modifying the current phase sequence array into the screened phase sequence array. According to the invention, the method analyzes and adjusts the phase sequence array of the double-circuit bus of the series reactor region, reduces the power-frequency electric field intensity of the series reactor region, and achieves a purpose of optimizing an electromagnetic environment.

The invention provides a low-noise high-shielding fA-level current signal cable for a radiation environment and a manufacturing process. The cable comprises an inner conductor arranged in the center of the cable, and a wrapping insulating layer, a wrapping semi-conductive layer, an outer conductor, an inner sheath, an outer shielding layer, a wave-absorbing functional layer and an outer sheath which sequentially wrap the outer layer of the inner conductor. According to the technical scheme, the cable has excellent strength, tensile capacity and ideal flexibility, can meet the requirements of low noise, high shielding, high temperature resistance, good flame retardance, radiation resistance and the like required by a radiation environment, and is suitable for stable and high-precision transmission of fA-level weak current signals.

The invention belongs to the technical field of microwave radio frequency and test measurement, and relates to a microwave darkroom with microwave absorbing ridges. With the direction facing a launching point as the reference, the ridges are laid on the ground, the top and / or the side wall of the microwave darkroom, and the laying position of the ridges is determined according to the following method, firstly, the position of a dead zone is determined, and a microwave absorbing ridge laying plane is used as a symmetry plane, a mirror point of the launching point is determined, the mirror pointof the launching point is connected with the two edges of the dead zone, the two connection lines form intersections with the microwave absorbing ridge laying plane, and a connection line of the twointersections is the microwave absorbing ridge laying plane. A new structural design which improves the electromagnetic environment of the microwave darkroom is provided.

The invention discloses a power conversion method and system for a multi-modular electric vehicle charging station. The method comprises the steps that 10 KV high-voltage alternating current introduced from a power grid side passes through a three-phase rectifier module and then is conveyed to a multi-modular charging station, and finally an electric vehicle is charged through a charging gun. The system comprises: a rectifier module used for converting high-voltage alternating current into direct current; and a current conversion module which is used for converting the direct current obtained by conversion of the rectifier module into direct current meeting the charging standard of the electric vehicle. Compared with a traditional 10KV automobile charging station power conversion system, a 10KV / 380V transformer is omitted; 10KV alternating current is directly converted into direct current, the voltage stress of a switch tube is reduced, and harmonic pollution is reduced; transmission is achieved through thin cables, materials are saved, and cost is reduced; and the voltage level of each converter can be reduced to kilovolt level or even lower, so that the switching frequency reaches a higher level, and the power density is further improved.

The embodiment of the invention discloses a robot positioning deployment method and device, equipment and a storage medium. The method comprises the steps: acquiring the positioning confidence degreeof a built-in sensor of the robot to a unit area; and determining whether the unit area is a to-be-deployed auxiliary positioning area or not according to the positioning confidence. The method comprises the following steps: identifying a to-be-deployed auxiliary positioning area, and subsequently selecting a corresponding deployment scheme to perform auxiliary positioning deployment according tothe value of positioning confidence. The deployment scheme includes but is not limited to label adding, pattern texture adding, UWB adding, differential GPS adding, electromagnetic environment improving, static article placing and the like. By adopting the technical means, the purpose of improving the positioning accuracy of the robot can be achieved.

The invention provides a complete machine system of an underwater robot and the underwater robot and relates to the technical field of underwater robots. The complete machine system includes: a powersupply unit, a light control unit, a power unit, a video transmission unit, a wireless image transmission unit and a signal transmission unit. One or more of the power supply unit, the light control unit, the power unit, the video transmission unit, the signal transmission unit and the wireless image transmission unit are provided with EMC modules. By arranging the EMC modules in the complete machine system, irradiation interference is reduced therewith, so that electromagnetic environment of the complete machine system is improved well.

The invention provides a quasi-zero current switch DC / DC converter based on a modular multilevel converter, the DC / DC converter includes a low voltage side modular multilevel converter, an LCL resonant circuit and a high voltage side A modular multilevel converter; the low voltage side modular multilevel converter is connected to the high voltage side modular multilevel converter through an LCL resonant circuit. The technical solution provided by the invention utilizes the LCL resonant circuit to realize the approximate soft switching of the MMC converters on both sides, which reduces the loss; the electrical stress and voltage change of the LCL circuit are reduced by rationally configuring the number of sub-modules and the operating mode of the MMC on both sides rate, improve the electromagnetic environment of the LCL, and improve the reliability of the DC / DC converter.

The invention relates to a transmission conductor coated with an inorganic / polymer composite material and a preparation method of the conductor, which belong to the technical field of electromagnetic environment protection of a power system transmission line. The transmission conductor consists of a steel-cored aluminum stranded wire and a ZnO voltage-sensitive ceramic / polymer composite material coating coated on the steel-cored aluminum stranded wire; ZnO voltage-sensitive ceramic is prepared from ZnO powder, Bi2O3 powder, MnO2 powder and Co2O3 powder which are subjected to the procedures of mixing, sintering and crushing; the weight ratio of ZnO to Bi2O3 to MnO2 to Co2O3 is equal to 95 to 1 to 0.5 to 1; the grain size of the crushed ZnO voltage-sensitive ceramic powder is 10-100 microns; and a polymer material is 705 silicon rubber. By virtue of the transmission conductor, an electric field at the surface of a polar conductor is effectively equalized, and corona is effectively restrained, so that a radio interference value is reduced, and an electromagnetic environment of a direct-current transmission line is optimized. An overhead line structure is designed again according to the transmission conductor disclosed by the invention, so that the width of a transmission corridor can be reduced.

The invention relates to an RFID antenna radiation performance strengthening device. According to the RFID antenna radiation performance strengthening device, a low-radiation brushless motor and a mechanism control module are fixed in a motor shielding cover on the lower surface of a mechanism bracket in parallel. A driving cam arm is fixed on an output shaft of the low-radiation brushless motor through a transmission pin, an inner ring of the driving bearing is fixed in an inner hole of the driving cam arm through a pressing sleeve, an outer ring of the bearing can rotate freely and is embedded into a supporting plate groove frame, the groove width of the supporting plate groove frame is slightly larger than the outer diameter of the driving bearing, and the driving bearing can rotate androll in a groove of the supporting plate groove frame; the supporting plate groove frame is fixed with the antenna supporting plate; the RFDI antenna is fixed on the antenna supporting plate; the supporting plate shaft is fixed on the central plane of the antenna supporting plate, the inner ring of the supporting plate bearing sleeves the supporting plate shaft and is fixed by a shaft check ring,and the inner ring of the supporting plate bearing is embedded into the inner hole of the supporting seat; and the supporting seat is fixed to the upper surface of the mechanism bracket.

The invention relates to a method providing real-time broadcasting services in a WCDMA mobile communication network, which sets up a professional broadcasting network in the existing WCDMA network, and the broadcasting network adopts dedicated carrier frequency and OFDM modulation technique to support high-speed multimedia broadcasting services; sending sets of all cellular cells in the broadcasting network adopt the same frequency, send the same information, realize single-frequency global coverage, and do not need to divide location area; when the dedicated carrier frequency is used for realizing single-frequency global coverage, a mobile terminal does not need cell switching when moving among all the cellular cells of the broadcasting network; a broadcasting system and a communication system coexist with the same frequency band, and can share a station, a device and an interior distribution system; and a broadcasting receiver module of the terminal and the original receiver module coexist with the same frequency band, and can share an antenna.

The invention provides a temperature control system of an analog-to-digital conversion circuit. The temperature control system comprises a small temperature field, a temperature control device, a heating device and a heat dissipation device, wherein the small temperature field is formed by heat sink; the temperature control device adopts a microprocessor in the analog-to-digital conversion circuitto perform digital PID calculation and outputs heating power to the heating device; the heating device is used for heating the heat sink by using a thin film heating sheet; and the heat dissipation device selects a heat conduction pad for natural heat dissipation. According to the temperature control system, the heat balance between heat production and heat dissipation is realized by using a simple and efficient method under the limitations of volume, power consumption, electromagnetic interference and the like, so that the temperature control with the precision of 0.05 DEG C is realized within the temperature range of 65-85 DEG C.

The short-wave machine-shared antenna isolation coupling system includes a three-mode matching feed network and an antenna, and it also includes a multi-channel isolation coupler. The multi-channel isolation coupler and the three-mode matching feed network are connected through a high-frequency transmission line. The multi-channel isolation coupler is formed by cascading more than two signal isolation couplers. The signal isolation coupler consists of two identical broadband transmission line transformer magic Ts, two pairs of identical all-pass network phase shifters and two complete The same filter composition. The invention improves the utilization rate of the antenna, greatly reduces the occupied area of ​​the antenna, and makes full use of the working frequency band of the antenna. #!

The invention discloses an offset-adaptive reconfigurable wireless power transmission system, which is characterized in that a P coil composed of a flux tube is symmetrically arranged in the coil ring gap of a double D transmitting coil, when the transmitting coil and the receiving When the position of the coil deviates, control the number of P coil pairs and the position of the P coil to compensate for the mutual inductance of the transmitting coil and the receiving coil. The present invention compensates the mutual inductance value when the position of the transmitting coil and the receiving coil deviates, ensures the constant output current, improves the energy transmission efficiency when the position of the transmitting coil and the receiving coil occurs, and improves the transmission coil and the receiving coil. The electromagnetic environment when the coil is displaced.