32results about How to "Avoid radiation interference" patented technology

The invention discloses a scanning method for a millimeter-wave active three-dimensional holographic-imaging human body security check system. The scanning method comprises the following steps: a rotary scanning and driving device is controlled by a control device to drive a first millimeter-wave switch antenna array and a second millimeter-wave switch antenna array to respectively rotate in parallel in opposite directions in a first scanning zone and a second scanning zone so as to carry out cylindrical rotating scanning to a zone to be scanned; and a parallel image processing device synthesizes the three-dimensional holographic image of a person to be detected according to the collected data from a first millimeter-wave transceiver and a second millimeter-wave transceiver and the spatial position information of the collected data.

The invention discloses a space-division-technology-based scanning method of a human body security check system for avoiding opposite radiation interference. According to the method, during scanning, the detection heights of antenna units in a first millimeter wave switch antenna array and a second millimeter wave switch antenna array are kept different at any time. With the scanning method disclosed by the invention, the opposite radiation interference of the switch antenna arrays on two sides of a millimeter wave active three-dimensional holographic imaging human body security check system is avoided and the imaging definition level is improved.

The invention discloses an electromagnetic compatibility testing load device and a testing system of a new energy automobile electric driving system. The load device comprises a load motor, a load motor controller, a transmission device, a torque rotating speed sensor, a power supply, a first photoelectric signal converter, a second photoelectric signal converter, a monitoring device, a DC high voltage filter and a screening box; the testing system comprises the load device, an electric driving system, a low-voltage artificial network, a high-voltage artificial network, a high-voltage DC source, a DC filter, a testing table and an anechoic chamber. The load device is movable, capable of realizing high-rotating speed large torque and used for performing electromagnetic compatibility testingof the large power motor, thereby preventing an operation of importing the radiation interference from the external and preventing the load device from producing radiation interference on the external testing environment; furthermore, the testing system takes electricity from the AC power grid, and the mechanical energy of the tested motor is converted into the electric energy through the load device, and then is merged into the AC power grid, thereby realizing the cyclic utilization of the energy and reducing the experimental consumption.

The invention discloses a large power wireless charging device detection apparatus. A test bench is arranged in a shielding room. The test bench is provided with a receiving installation seat where a charging receiving unit is installed, and an emission installation seat where a charging emission unit is installed. The test bench is provided with a receiving terminal controller and an isolation transformer which are connected to the charging receiving unit. The test bench is provided with an emission terminal controller connected to the charging emission unit. The large power wireless charging device detection apparatus has the advantages that the large power wireless charging device can be accurately and reliably detected, and the radiation interference to the surrounding environment is avoided.

The invention belongs to the field of hemispherical resonant gyroscopes, and particularly relates to a hemispherical resonator mandrel vibration detection circuit and a hemispherical resonator mandrelvibration detection device. The hemispherical resonator mandrel vibration detection circuit comprises a plurality of pairs of interdigital electrodes arranged around a hemispherical resonator mandrel, wherein each pair of interdigital electrodes and the hemispherical resonator mandrel locally form a detection capacitor; each detection capacitor is connected with a voltage detection circuit; eachvoltage detection circuit comprises an operational amplifier and an operational amplifier capacitor; two ends of each operational amplifier capacitor are connected to an inverting end and an output end of the corresponding operational amplifier respectively; one interdigital electrode of each detection capacitor applies a constant voltage, the other interdigital electrode of the detection capacitor is connected with the inverting end of the corresponding operational amplifier, and the non-inverting end of the operational amplifier is grounded; and an output end of each operational amplifier outputs an operational amplifier output voltage, and whether the mandrel vibrates or not is judged according to whether the voltage is changed or not. The hemispherical resonator mandrel vibration detection circuit and the hemispherical resonator mandrel vibration detection device are simple in structure, and can detect the vibration condition of the mandrel in a non-contact manner.

The invention belongs to weak signal amplification and extraction technology, and relates to a high-sensitivity laser receiver. The high-sensitivity laser receiver of the present invention includes a timing control module, a TGC control module, a constant false alarm control module, and an integrated operational amplification module, wherein, the sequential control module passes through the TGC control module, the integrated operational amplification module, and the constant false alarm control module sequentially. The module is then connected to a bias circuit, the other channel of the timing control module is directly connected to the bias circuit, and the integrated operational amplification module is connected to the bias circuit through a photodetector. It adopts the time/temperature gain automatic control technology to effectively avoid the radiation interference of the laser radiator, uses the constant false alarm control technology to make the photodetector work in the best working state, and increases the timing control part of the circuit to make the receiving amplifier circuit When the gain is large, the avalanche bias voltage is removed, so that the laser rangefinder can effectively reduce the electrical noise of the system when it is working, and achieve the goal of reducing voltage, reducing noise, and increasing gain.

The invention discloses a vehicle-carrying TFT LCD and its driving method, wherein the drive circuit of the display composes an interface box signal processing circuit, a display screen signal processing circuit and transmission cables, An A/D conversion and data compression processing circuit in the interface box signal processing circuit accomplishes the computer VGA or video signal processing and conversion using the mode of voltage difference signal through the transmission cable, the signal is then transmitted to the display screen signal processing circuit for signal restoring through decompression, format conversion, sequence signal formation circuit and DA conversion circuit, thus obtaining the analog data stream needed by the liquid crystal display screen and realizing screen display function.

The invention provides a dual-filter duplexer, relates to the field of electronic technology, and aims to solve the technical problems of a traditional LC duplexer that large radiated interference, large insertion loss and low harmonic suppression exist between two high-and-low-pass filters and difficulty exists in suppressing higher harmonics. The dual-filter duplexer consists of an LC low-pass filter and an LC band-pass filter, wherein the LC low-pass filter is connected with the input terminal of the LC band-pass filter and also connected with an external signal source; and the output terminals of the two filters respectively output outwards.

The present invention provides an antenna structure and a display device including the same. The antenna structure of an exemplary embodiment of the present invention includes a middle frame of the display device, a dielectric layer formed on the middle frame, and a dielectric layer disposed on the dielectric layer and including radiation Patterned antenna electrode layer. By using the middle frame as the ground layer of the antenna electrode layer, a slim display device can be realized, and signal efficiency and reliability can be improved.

The present invention discloses a micro-strip combiner. The micro-strip combiner comprises a high-frequency branch having a frequency range of 2300MHz-2690MHz and a low-frequency branch having a frequency range of 1710MHz-2170MHz which are arranged on a micro-strip board, and the high-frequency branch and the low-frequency branch combine one combiner output port. The cost is reduced while the electrical indexes are ensured, a certain technology difficulty is broke through, and the fine optimization is performed at the aspects of dimension control and installation technology. Besides, a connection port is a welding form, and compared to an N-type screw thread interface used by a general cavity combiner, the micro-strip combiner and the installation structure thereof are better in intermodulation stability.

The embodiment of the invention provides a shielding structure and a terminal. The shielding structure comprises: an interference source comprising an electron radiation region; a shielding cover fixedly connected with the interference source, wherein the shielding cover covers the upper portion of at least part of the electron radiation region of the interference source, and the grounding end ofthe shielding cover is electrically connected with the grounding end of the interference source. The shielding structure provided by the embodiment of the invention can shield and absorb the radiationinterference generated by the shielding structure itself, or can prevent other modules from generation of the radiation interference for the shielding structure so as to solve the interference problem between different electron device modules.

The invention discloses a device for remote transmission control on reactivity of a reactor. The device comprises a driving mechanism, a transmission shaft and a control drum, wherein the output shaftand the transmission shaft of the driving mechanism are sequentially connected with the control drum; an outer sleeve is arranged outside the transmission shaft; the driving mechanism and the controldrum are respectively provided with shells; and both the shell of the driving mechanism and the shell of the control drum are connected with the outer sleeve in a sealed manner to form sealed spaces.The device has the beneficial effects that a mechanical structure is adopted to remotely control rotation of the control drum, then the reactor can be remotely controlled with high reliability, and radiation interference can be avoided. The outer sleeve of the transmission device is filled with a protection gas, a transmission component, bearings and the like are operated in an inert gas environment, and reliable performance of operation components can be ensured. A transmission rod is connected with the combination of a universal joint coupling and a spline, and thus angle deviation betweena power output shaft and the rotating shaft of the control drum and axial stretching and withdrawing caused by temperature change can be compensated.

The invention relate to the technical field of vehicle-mounted wireless charging, in particular to a vehicle-mounted wireless charger with low electromagnetic interference. The vehicle-mounted wireless charger comprises a charging coil, a metal cover and a printed circuit board (PCB) mainboard, wherein the metal cover is arranged below the charging coil, the PCB mainboard is arranged below the metal cover, the charging coil is connected with the PCB mainboard, a ferrite plate is further arranged between the charging coil and the metal cover, and a metal support is further arranged between themetal cover and the PCB mainboard. By arranging the metal cover and the ferrite plate, the inductance of the coil can be improved by the ferrite plate and is more stable, an electromagnetic field alsocan be shielded, the magnetic field is prevented from radiating the metal cover, the electromagnetic interference can be shielded and absorbed by the metal cover, the electromagnetic interference radiated from the charging coil can be reduced under the condition of no influence on normal charging, and the vehicle-mounted wireless charger has a relatively good effect of improving electro magneticcompatibility (EMC) of charging equipment.

The embodiment of the invention provides a common-mode interference suppression device and a variable-frequency electric appliance. The common-mode interference suppression device comprises a live wire branch, a zero line branch, a ground wire branch, a first filter, a second filter and a third filter, wherein one end of the live wire branch is connected with a live wire of the AC power supply, the other end of the live wire branch is connected with the load branch, and the live wire branch is provided with a first filter; one end of the zero line branch is connected with a zero line of the AC power supply, the other end of the zero line branch is connected with the load branch, and the null line branch is provided with a second filter; and one end of the ground wire branch is connected with the ground wire of the AC power supply, the other end of the ground wire branch is grounded, and the ground wire branch is provided with a third filter. Therefore, case common-mode interference is prevented from being coupled from the power ground wire to the power zero wire and the power live wire through idle coupling between the cables, radiation interference generated by the power ground wire is avoided, common-mode interference suppression can be carried out without increasing the number of filtering stages and increasing the number of turns and the number of magnetic rings, and the filtering cost is reduced.

The decoupling unit for two bus systems that are connected to one another includes a connecting circuit between two interface circuits (10,12). The first interface circuit (10) has ports for one of the two bus systems and a bidirectional data port for the connecting circuit. A second interface (12) circuit has ports for the other bus system and a bidirectional data port for the connecting circuit. This connecting circuit includes a filter (14,16) for blocking abnormal dominant signals and passing normal signals between the bus systems.

The invention provides a server multi-slot-position metal line concentration pipe device. The device comprises an outer pipe and an inner pipe concentric with the outer pipe; the inner pipe is arranged in the outer pipe, and at least five partition plates are arranged on the periphery of the inner pipe; one end of each partition plate is fixed to the inner pipe, the other end of each partition plate is fixed to the outer pipe, and the partition plates are arranged outwards in a divergent mode with the center of the inner pipe as the circle center. Through the design, the problem of crosstalk between cables can be solved by utilizing the shielding property of the metal wire collecting pipe, and meanwhile, a relatively concise and attractive design structure is provided for cable arrangement.

The invention relates to a data transmission device and method, a control device and electrical equipment. Through a sending device and a receiving device in the data transmission device, data needing to be transmitted by a data sending end can be firstly converted into communication data in a specific form which does not cause electromagnetic interference, then the communication data are transmitted in a non-contact form, and finally the communication data in the specific form are converted into communication data which can be identified by a data receiving end. Conduction interference in the wired transmission process is avoided in a non-contact mode, and radiation interference in the traditional wireless transmission process is avoided. Moreover, compared with optical fiber transmission, the scheme provided by the invention is relatively low in cost.