88results about How to "Reduce electromagnetic pollution" patented technology

The invention belongs to the field of intelligent household, relates to an intelligent household control system, and particularly to an intelligent household control system based on ZigBee and cloud computing. A main structure includes an information acquisition and equipment control module, a ZigBee wireless sensing network, a household intelligent gateway, an RFID device, a cloud server, and a mobile terminal device, the information acquisition and equipment control module includes an environment information acquisition sensor and a household equipment controller, a ZigBee coordinator node, a ZigBee router node, and a ZigBee terminal node form a ZigBee three-level tree-shaped wireless sensing network to form an intelligent household network frame. The ZigBee network performs the intelligent regulation and control on the household equipment, the user data is stored and processed via the cloud server, the users' behavior habit is deeply tapped, so that a household control scheme based on the users' behavior habit is generated, the indoor wireless signal radiation maintains at a low level, the main structure is simple, the design conception is ingenious, the application environment is friendly, and the market prospect is wide.

The invention relates to a high-speed electromagnetic valve driver circuit. An input signal buffer unit mainly performs buffering shaping on an input signal from an external central control unit and improves the antijamming capacity thereof; a high side current detection unit realizes current detection by detecting differential voltage of one resistor in a load branch circuit; a PWM signal generator mainly generates a PWM wave with fixed frequency, the current is controlled and kept by regulating the duty cycle of the waveform; a power drive unit mainly supplies enough power drive for a power NMOS tube so that the power NMOS tube can fully operate in a switch state and reduce switch loss and heating; a signal time delay unit outputs a time delay for a current detection signal; in the delay time, the power NMOS tube is cut off, so that a coil can have afterflow; a logical gate circuit unit is a coincidence gate and generates a synchronizing signal required by the PWM signal generator after performing phasing on the current detection signal and a time delay signal thereof.

The invention discloses a composite electromagnetic shielding paint based on a nano carbon material. The composite electromagnetic shielding paint is prepared by mixing composite shielding materials such as nano carbon particles, nano graphene, carbon nanotube, carbon fiber, ferriferrous oxide particles, iron and nickel carbonyl particles with a polymer emulsion, a coupling agent, a dispersant, an antifoaming agent, a film forming auxiliary agent, a thickening agent and the like. The employed electromagnetic shielding paint has the advantages of low density and wide absorption band, and can be widely used in electromagnetic shielding engineering, and thereby, electromagnetic wave can be shielded and absorbed, electromagnetic interference is reduced, and electromagnetic environment pollution can be avoided.

The present invention belongs to the aerial vehicle positioning, tracking and identification technical field and relates to a passive positioning and identification system for civil unmanned aerial vehicles. The system is composed of three parts, namely, a passive radar, a signal detection and receiving part and a fusion processing part. According to the passive positioning and identification system for the civil unmanned aerial vehicles of the present invention, the passive radar is adopted to detect and position an unmanned aerial vehicle at a low altitude and a low velocity; since the passive radar has a good capability of detecting small targets at low altitudes and low velocities, and therefore, a good unmanned aerial vehicle detection effect can be realized; since the characteristicsof different types of unmanned aerial vehicle remote control and telemetry signals have large differences, so that an unmanned aerial vehicle remote control and telemetry signal detection and receiving analysis method can be adopted to identify unmanned aerial vehicles; the passive radar is adopted to guide the system of remote control and telemetry signal detection and receiving, and therefore,a signal detection and receiving acting distance can be prolonged, and the complexity and cost of signal detection and receiving can be improved; and during work, the entire system does not need to radiate out signals, and therefore, the system is free of electromagnetic pollution and environmentally friendly.

The invention discloses a wave-absorbing magnetic-conductive shielding film and a manufacture method thereof. The wave-absorbing magnetic-conductive shielding film has a layered structure. Through reasonable superposition of a wave-absorbing layer, a magnetic conductive layer and a shielding layer, the wave-absorbing magnetic-conductive shielding film has a quite good shielding effect for electromagnetic waves with a frequency of 100MHz to 10GHz, and the electromagnetic shielding efficiency can reach more than 80DB. The preparation method is carried out by use of a mode of combining routine coating and magnetron sputtering, the operation is simple, and a formed film layer is light, thin and compact. Therefore, the wave-absorbing magnetic-conductive shielding film and the manufacture method are applied to various electronic products and communication devices.

The invention discloses data center IT equipment and a cabinet U-bit detection system. The system comprises an identification code memorizer for storing and identifying identification code of the binding IT equipment; an infrared emitter for emitting infrared signals; an infrared receiver for receiving infrared signals; a retaining plate for reflecting the infrared signals emitted by the infrared emitter to the infrared receiver; and a controller which is used for judging corresponding U-bit service condition and outputting a control signal to a status display module according to the judged result, and is used for reading an identification code stored in the identification code memorizer. According to the data center IT equipment and the cabinet U-bit detection system, the service condition of the cabinet U-bit space can be directly detected without depending on attribute parameters of other systems and the IT equipment, so that automatic and visual detection of IT equipment deployment and position change is achieved; moreover, IT equipment change information can be accurately recorded timely through the identification code which is bound with the IT equipment, so that using cost is reduced to the maximum, electromagnetic pollution of a computer room is reduced and work efficiency is greatly improved.

This invention discloses a send / receive and diversity method for an intelligent antenna and a device, in which, a dead zone process of an adaptive intelligent antenna is added to the receiving method. First of all, multiroute search and distribution on time domain to the baseband signals is carried out then to receive every distributed multiroute time delay with one intelligent antenna to process in signal beam weight and tracing de-disturb, de-expansion to renew the beam weight value, finally to carry out multiroute merge to get the data information.

The invention discloses a chemical plating nickel conductive film on polymer thin film surface and method for preparing the same, wherein the conductive film is prepared through the steps of, (1) a pretreatment step of cleaning the surface of the polymer film, (2) carrying out activating and / or sensitization to the polymer film obtained in steps (1), water scrubbing for use later, throwing the polymer film obtained in step (2) into chemical plating liquid, water scrubbing for use later, (4) drying and heat treatment at 120-220 deg. C.

The invention relates to a super high-voltage current transformer transient characteristics tester. Alternating-current equal ampere-turns bus winding and pulse direct current equal ampere-turns bus winding are respectively winding on the toroid coil of the transient current mutual inductor in acircumference homogeneous distribution mode, the turn number of the two windings is equal, the two windings use common decoupling electric impedance; the alternating-current equal ampere-turns bus winding is connected with the output end of a large-capacity step down transformer through a switch, consisting an alternating-current t equal ampere-turns loop; the direct current equal ampere-turns bus winding is connected with one or two capacitor charged with high voltage through a switch, a reactor and a resistor, consisting a direct current equal ampere-turns loop. The discharging time sequence is operated by a measurement and control apparatus, the desired transient experiment current can be obtained on the ring shaped iron core of the tested transient current mutual inductor when the two loops are combined for discharging. The invention possesses the advantages of novel concept, reasonable design, simple structure, easy operation, reduced experimentation cost of the extra-high voltage transient current mutual inductor and reduced electromagnetic pollution of experiment current to surroundings.

The invention provides a wireless power transmission system. The wireless power transmission system comprises a transmission end rectification filtering circuit module, a transmission end inverter circuit module, a transmitting coil, a transmission end control circuit model, a receiving coil, a receiving end rectification filtering circuit module, a loading circuit module, a receiving end control circuit module and a current sampling circuit module, wherein the current sampling circuit module is connected with two ends of the transmitting coil and used for collecting the current of the transmitting coil. The invention further provided a realizing method of the wireless power transmission system, the realizing method comprises a safe loading recognition process, simple interaction is carried out between the receiving end control circuit module and the transmitting coil, and accurate recognition of loyal loading is achieved. According to the wireless power transmission system and the realizing method of the wireless power transmission system, additional communication conditions does not need to be added, a simple and effective loading recognition function is provided, safety risks possibly caused by mistaking heating of metal object in the usage process are effectively prevented, the production cost is low, the electromagnetic pollution is low, and popularization and application are convenient.

The invention discloses an implement system of an access network for loading all information business of resident users, which comprises a main unit, an expansion unit and a remote end unit. The invention further discloses an implement method of the access network for bearing all the information business of the resident users, which comprises the following steps: jointing and combining one or more than one kinds of signals which are sent by an information source, transmitting the signals to one or more than one remote ends through optical fiber after converting the signals into light signal branching, carrying out the electric-to-optical conversion to the light signals which are respectively received by each of the remote ends, radiating the signals to a user end through an antenna, transmitting the light signals through the optical fiber after respectively carrying out the electric-to-optical conversion to electrical signals which are received through the antenna by each of the remote ends, respectively converting the received light signals into the electrical signals, transmitting the electrical signals through dividing the signals into business RF electrical signals in different frequency ranges after integrating the electrical signals into the electrical signals. With the invention, the functions of accessing and exiting all types of user information business and the loading transmission function can be realized in resident areas only through building a physical network.

The invention provides wireless broadcast transmitting and receiving equipment and a communication system. The wireless broadcast transmitting equipment and the wireless broadcast receiving equipmentcommunicate in a time period of a broadcast interval and a control interval, wherein a second time period in the broadcast interval is used for transmitting to-be-broadcasted data broadcasted by the wireless broadcast transmitting equipment, a first time period in the control interval is used for transmitting a control sequence sent by the wireless broadcast transmitting equipment, and a second time period in the control interval is used for transmitting feedback information sent by the wireless broadcast receiving equipment. Due to the fact that an information feedback channel and an information feedback mechanism are established in the wireless broadcast communication system, a broadcast receiving end can inform a broadcast transmitting end of local state information and control information of the broadcast receiving end, and the broadcast transmitting end can know the information in time.

The invention discloses an intermittent pumping constant current air-breathing type aeration device for fish culture. The intermittent pumping constant current air-breathing type aeration device comprises a constant current seal box, a moisture control box and an air-breathing aeration box. The constant current seal box is divided into a filter area and a water storage aeration area by a separating board with holes, wherein the water storage aeration area enables filtered water to obtain first aeration. Parts inside the moisture control box can control the starting and stopping of a water pump which injects water into the constant current seal box and control water flow rate flowing from the constant current seal box. The constant current seal box can ensure that water inside a fish tank can be smoothly pumped to the filter area by the water pump and ensure that water inside the water storage aeration area flows out automatically at a constant speed. Water flowing out of the water storage aeration area enters the air-breathing aeration box to perform second aeration and enters water body where fish lived in. According to the intermittent pumping constant current air-breathing type aeration device for the fish culture, three measures that the water is pumped intermittently, the air is pumped automatically to the water body by water flow and the automatic aeration is performed twice are adopted, the power consumption of water circulation and aeration is reduced greatly.

The invention relates to an airport surface detection radar comprising a power supply system, and an antenna feed system, a channel transmit-receive system and a signal processing system connected in order; the power supply system comprises an emission power supply, a channel transmit-receive power supply, and a signal processing power supply; the emission power supply is connected with a radio frequency transmitter; the channel transmit-receive power supply is connected with the channel transmit-receive system; the signal processing power supply is connected with the signal processing system. The airport surface detection radar is low in emission power, low in cost, easy to repair, small in environment electromagnetic pollution, good in anti-interference performance, high in reception sensitivity, and wide in application prospect.

The invention discloses a relay method and a nodal point of power line communication. The method includes judging whether the target address in a data frame is matched with the address of the nodal point or not after receiving the data frame. The data frame carries the target address, relay hopping times and sent times. If the target address in a data frame is not matched with the address of the nodal point, the method determines whether the data frame satisfies the forward condition. The transfer condition at least comprises that the data frame is not sent and the forwarded times is smaller than the relay hopping times. If the data frame satisfies the forward condition, the forwarded times in the data frame is added by 1 sequentially according to broadcast times and are broadcasted. The broadcast times is obtained by calculating the relay hopping times, the forwarded times in the data frame and the largest sending times of the nodal points, and the largest sending times is larger than the relay hopping times. The relay method and the nodal point improve successful ratio of the power line communication while not sacrificing communication time by combining repeated sending with the flooding technology.

The invention provides carbon fiber-carbonyl iron compound modified wave-absorbing concrete and a production method thereof. The carbon fiber-carbonyl iron compound modified wave-absorbing concrete comprises the following raw materials of, in parts by mass, 100-130 parts of water, 10-15 parts of a carbon fiber-carbonyl iron nanometer compound absorbent produced on the basis of a production methodof the carbon fiber-carbonyl iron nanometer compound absorbent of claim 1, 300-400 parts of silicate cement, 500-600 parts of fine aggregate, 800 parts of aggregate and 1.0-2.0 parts of a water reducer. According to the concrete, not only can a microstructure of the concrete be improved to obtain excellent mechanical performance, but also outstanding wave-absorbing performance can be obtained, sothat the concrete has potential application values.

The invention provides a fast heating device based on microwave energy capture, relating to a heating device, in particular to a fast heating device based on microwave energy capture. The invention provides a fast heating device which is based on microwave energy capture and mainly used for microwave furnaces. The invention can rapidly capture microwave energy uniformly and intensively to a heating article and improves heating efficiency and reduces heating time by utilizing the resonance of a microwave ceramic cylinder; a heating load and a microwave source achieve the best matching and the reflective wave tends to zero; the invention can prolong the service life of a magnetron, reduces the leakage of microwave energy and reduces electromagnetic pollution. The invention is provided with a supporting body and at least one microwave ceramic cylinder which is embedded in the supporting body; the diameter D of the microwave ceramic cylinder is 5-120mm, the height L thereof is 4-20mm; and the relative dielectric constant Epsilon thereof is 5-150.

The invention discloses a composite material shielding power cable. The composite material shielding power cable is divided into two classes including the single-core cable and the multi-core cable, the single-core cable is wrapped by an insulating layer, and the insulating layer is wrapped by a composite material shielding layer; the multi-core cable is characterized in that a shielding layer is arranged outside each core wire insulating layer; or a shielding layer is arranged in a protection layer; or shielding layers are arranged outside the insulating layer and in the protection layer at the same time. The composite material shielding power cable is simple in structure, and the shielding materials are light; meanwhile, the anti-electromagnetic interference capacity of the cable can be effectively improved, potentials can be balanced, power supply quality can be improved, and electromagnetic environment influences generated by electrification wires can be reduced.

The invention belongs to the technical field of wireless charging, and discloses a wireless charging device, system and method, a mobile terminal and a storage medium. The wireless charging device comprises an internal charging system which is installed in an external metal frequency selection box body and used for achieving wireless charging. The four side faces and the top face of the metal frequency selection box body are all band-pass type frequency selection surfaces. A multi-antenna subsystem of the internal charging system comprises N antenna units, wherein N is an integer greater than1. The antenna unit adopts an oscillator antenna, a microstrip patch antenna, a waveguide slot antenna, a spiral antenna or a dielectric resonator antenna; and the N antenna units of the multi-antennasubsystem are uniformly arranged on the inner sides of the four side surfaces of the metal frequency selection box body in a two-dimensional annular manner or are arranged on the three-dimensional curved surface of the whole inner side of the metal frequency selection box body. According to the invention, simultaneous wireless charging of a plurality of mobile communication devices with differentbrands, different device types and different placement modes can be realized, normal communication can be realized, and the device has the advantages of high transmission efficiency, stable transmission, environmental protection and the like.

The embodiment of the invention discloses a transmission device, a transmission system and a transmission method for indoor multisensor data based on optical communication. The transmission device comprises an optical transmission module and an optical receiving module, wherein the optical transmitting module comprises a light emitting diode; the optical receiving module comprises a light sensor;the transmission device further comprises a processor, a memory, an internal control register and an external interface; the processor is electrically connected with the memory, the internal control register, the external interface, the optical transmission module and the optical receiving module; the external interface is used for connecting a plurality of corresponding sensors. According to theembodiment of the invention, optical communication is adopted to replace radio frequency communication and a serial port protocol is compatible with an optical communication protocol by protocol conversion; the transmission device is used as a node of a sensing network, so that interface compatibility of the sensing network node, node layout simplicity, communication reliability of the sensing network and the safety of a sensing network layout environment are improved, and electromagnetic pollution of sensing network layout is reduced.

The invention discloses an intelligent Wi-Fi imaging method and system based on a field programmable meta-material. An intelligent Wi-Fi imaging system based on a field programmable meta-material is built by adopting a Wi-Fi router, a reference receiver, a main receiver and an electric control field programmable meta-material with a working frequency band covering a Wi-Fi frequency band. The method comprises the steps that: a Wi-Fi signal is directly used for detecting a target, electromagnetic waves do not need to be actively emitted to the target, and a deep learning method is used for achieving long-distance and non-line-of-sight real-time imaging on the target. The intelligent Wi-Fi imaging method and system can achieve long-distance and non-line-of-sight real-time imaging, and have the characteristics of low cost, high efficiency and the like.

The invention relates to the technical field of communication shielding. The invention discloses a frequency agile intelligent interference machine comprising a transmission unit, a receiving unit and an interference unit, wherein the transmission unit meets n-path interference signal bandwidth requirements when working in a broadband state; the interference unit comprises a signal detection unit, an n-path interference signal generation circuit, a multiplexer and a frequency agile unit; the signal detection unit generates circuit connections with the n-path interference signals, the n-path interference signal generation circuit is connected with the multiplexer, and the multiplexer transmits n-path interference signals to the transmission unit, the signal detection unit outputs n-path signals matched with environment signal features through detecting an environment signal, and respectively controls the n-path interference signal generation circuit to output corresponding interference signals; and the frequency agile unit is connected with the transmission unit and the receiving unit, used for switching carrier frequency of the transmission unit and the receiving unit, and n is not less than 2. The frequency agile intelligent interference machine is beneficial to protecting environment and human health, and ensures reliability of interference.

The invention discloses a point-to-point wireless power supply coil coupling model and a point-to-point wireless power supply system. The point-to-point wireless power supply coil coupling model comprises a transmitting resonant ring and a receiving resonant ring. The transmitting resonant ring and the receiving resonant ring in the point-to-point wireless power supply coil coupling model are coupled to each other, the resonant frequency of the transmitting resonant ring is identical to the resonant frequency of the receiving resonant ring, that is, the transmitting resonant ring and the receiving resonant ring stay at a magnetic resonance state, and the transmitting resonant ring and the receiving resonant ring, which stay at the magnetic resonance state, can improve the transmission efficiency in the wireless power supply process.

The invention relates to a bistable magnetic clutch; wherein, a permanent magnet and an operating coil are arranged between a driving wheel and a driven wheel; a permanent magnetor type brake is arranged on the driven wheel; the clutch keeps subject to permanent magnetic force in the separating state and the bonding state, but the mutual shift between the separating state and the bonding state is realized on condition that the electromagnetic force of the operating coil overcomes permanent magnetic force to lead a permanent magnetic line to change direction. When the clutch shifts from the bonding state to the separating state, the brake brakes, that is, the stator coil of a permanent magnetor is bonded to form a closed-loop, and the permanent magnet rotor of a permanent magnetor rotating along the driven shaft leads the stator coil to generate an inductive magnetic field which stops the permanent rotor from rotating to realize the brake and generates external power simultaneously. The bistable magnetic clutch has the advantages of quick operation, environmental protection, little maintenance, and long service life, and being suitable for various working conditions on condition that a driven mechanism and a power source are bonded or separated.

The invention relates to a method for providing real-time broadcast service in a CDMA2000 mobile communication network. The method comprises the following steps: setting a professional broadcasting network in the prior CDMA2000 network, the broadcasting network adopting special carrier frequency and OFDM modulation technique to support high-speed multimedia broadcast service; and transmitting identical information by transmitters using the same frequency in all cells in the broadcasting network to achieve single-frequency full-domain coverage without dividing position regions, wherein the mobile terminal can move in among all cells in the broadcasting network without switching cells when achieving the single-frequency full-domain coverage by using the special carrier frequency. The broadcasting system and the communication system coexist in the same frequency band, and can share a station, equipment and an indoor distribution system. A broadcast receiving module in the terminal and the original receiving module can coexist in the same frequency band and can share an antenna.

The invention relates to a novel high-speed magnetic suspension train structure, in particular to a novel high-speed magnetic suspension train and a suspension mechanism with simple structure and lowelectromagnetic pollution. The novel high-speed magnetic suspension train comprises a train body and a track arranged opposite to the train body and extending in the driving direction of the train body; a track groove is formed in the bottom of the train body, and the track is arranged in the track groove; the track groove is of a semi-closed concave groove structure, and an accommodating cavity is formed in the track groove; and a balancing magnet device, a suspension magnetic device, a transverse power-assisted wheel group and a longitudinal active power wheel group are correspondingly arranged in the accommodating cavity, wherein the balancing magnet device and the suspension magnetic device are used for the matching action of the track groove and the track, and the transverse power-assisted wheel group and the longitudinal active power wheel group are used for the sliding matching of the track groove and the track. According to the novel high-speed magnetic suspension train, a permanent magnet provides suspension force for supporting the train, the energy consumption is low, the service life is long, the electromagnetic pollution is low, and maintenance and operation cost is low. The novel high-speed magnetic suspension train has simple structure and good use performance.

The invention relates to wireless communication technologies and multimedia communication technologies, in particular to a wireless mobile communication system effectively applied to an office environment. The wireless mobile communication system can solve the problem that in major hotels, restaurants, commercial buildings, large and medium residential estates, diggings and the like, blind areas exist in terminal wireless communication systems due to channel fading. According to the wireless mobile communication system, the modern electronic technology and advanced communication means are utilized, a low-power and multi-station common wire connecting mode which is the same in sending and receiving frequency and can be used by all stations is ingeniously used, and the blind area problem occurring in interphones in various complex environments is well solved. According to application practices of a plurality of star-grade restaurants, hotels, commercial buildings and residential estates, the effect is good. According to the system, novel auxiliary equipment of the wireless communication system can be developed according to different requirements of clients and a new field is opened for expanding and perfecting an existing wireless communication system.

The invention relates to a disc type reactor-based static synchronous compensator (STATCOM) and a control method. The STATCOM comprises a signal acquisition and processing module, a master control module, a driving module, a power conversion module, a novel disc type reactor module and the like, wherein the signal acquisition and processing module is used for acquiring the voltage and current information of a three-phase power grid and the alternating current side output current and direct current side voltage information of the STATCOM in real time, and processing the acquired information; the master control module performs coordinate transformation and operation on the acquired information to obtain a required carrier phase shifted sinusoidal pulse-width modulation (CPS-SPWM) signal; the driving module generates a triggering pulse; and the power conversion module consists of three full-bridge linked strings. A disc type reactor is used, has the advantage of greatly reducing a size, a weight and electromagnetic pollution compared with a hollow reactor, and has the advantages of greatly reducing vibration and noise and remarkably improving the linearity of an inductor L compared with the conventional open core reactor. Reactive current in a power system can be dynamically compensated, harmonic waves can be suppressed, and the power quality and voltage stability of the power system can be effectively improved.

The invention relates to a linear motor of a communicated magnetic circuit. The linear motor comprises a primary winding (31) and a secondary winding (32). The linear motor is characterized in that: the primary winding (31) is a closed magnetic circuit and comprises at least one primary magnetic circuit (34) and at least one communicated magnetic circuit (35); the primary magnetic circuit (34) and the communicated magnetic circuit (35) are connected to form the closed magnetic circuit; a leakage flux induction coil winding (33) is wound on the communicated magnetic circuit (35); and a linear motor primary winding (36) is wound on the primary magnetic circuit (34). The linear motor of the communicated magnetic circuit can reclaim the leakage flux loss of the longitudinal end effect of the linear motor, improves the power factor, improves the utilization rate of electrical energy and reduces electromagnetic pollution caused by the end effect of the linear motor due to open magnetic circuit.

A novel annealing process for sheet-like Fe-based alloy powder comprises the steps of: (1) uniformly mixing a sheet-like Fe-based alloy coarse powder obtained by high-energy ball milling and drying with nitride powder and oxide powder, and transferring the mixture to an annealing furnace; (2) H2 is introduced into the annealing furnace at the airflow of 200-600 m<3> / h, the temperature is raised to600-1200 DEG C, and the mixture is annealed for 1-2 h and then slowly drops to room temperature and is discharged; (3) the mixed powder obtained after annealing is transferred to a magnetic powder filter, and the sheet-like Fe-based alloy powder is obtained after filtering. As for the sheet-like powder treated by the novel annealing process, obvious change of the shape of the powder caused by theheat treatment process is avoided; the looseness and tap density are improved accordingly; the morphology is more regular; and the powder tends to be flattened, and has the excellent electromagneticwave absorption performance.