39results about How to "Improve electromagnetic anti-interference ability" patented technology

The invention discloses a multi-parallel inverter motor speed regulating system and a control method of the multi-parallel inverter motor speed regulating system. The system is formed by connecting multiple inverter modules in parallel. The direct current sides of multiple inverter sub modules are directly connected with a direct current power supply with a direct current bus capacitor in parallel. The alternating current sides of the multiple inverter sub modules are connected with multiple sets of smoothing reactors respectively in series and then directly connected in parallel to drive an alternating current motor. By the adoption of the structure, modularization expansion of the motor speed regulating system is easily conducted, and the fault-tolerance performance of the motor speed regulating system is enhanced. By means of a random SVPWM method based on carrier phase shifting, switching frequency of parallel inverters is equivalently improved, switching subharmonic energy within narrow frequency bands is equalized, the harmonic performance of output currents of the parallel inverters is improved, and electromagnetic interference resistance of the motor speed regulating system is enhanced. By the adoption of a space vector synthetic technology for dynamically allocating SVPWM zero vectors, zero-sequence circulating currents between the parallel inverter modules are effectively eliminated, and normal operation of the system is guaranteed.

The invention discloses a self-supporting lightning-proof optical cable. The self-supporting lightning-proof optical cable comprises a cable core, a covered layer and a suspension wire, wherein the cable core is used for transmitting an optical signal and power; the covered layer is covered with the cable core; and the suspension wire is connected with the covered layer. The covered layer comprises a shielding layer, an outer sheath and a ground layer, wherein the shielding layer shields the cable core; the outer sheath coats the shielding layer; and the ground layer is arranged between the cable core and the shielding layer. The self-supporting lightning-proof optical cable of the invention can prevent communication equipment from being damaged by thunder and lightening, effectively prevent an electromagnetic field generated by the shielding cable from disturbing other communication cable signals and prevent external electromagnetic field from disturbing the cable core.

The invention discloses a multigroup lightning protection optical cable which comprises cables and a coating layer covering the cables, wherein the cables are made of multigroup cable cores covered by an inside liner; and the coating layer comprises a shielding layer for shielding the cables, an outer jacket covering the shielding layer and a grounding layer arranged between the inside liner and the shielding layer. The multigroup lightning protection optical cable can prevent lightning from damaging communication equipment, and can effectively shield the interference of an electric magnetic field generated by the cables on other communication cable signals and the interference of an external magnetic field on the cables.

The invention relates to a high-voltage divider and belongs to the technical field of power industry devices. The high-voltage divider of the invention is mounted on a ceramic rod. Imported raw slurries and imported production process are adopted in the production of a resistance film; in order to eliminate the influence of capacitance distributed capacitance on the divider, the outer layer of the divider is sleeved with an equal-altitude high-voltage thick-filmed resistor; in order to adapt to integrated pour encapsulation of resin and silica gel of the divider, the middle layer of the divider is filled with a buffer material; and the outermost layer of the divider is coated with a buffer film, and therefore, the divider has excellent adhesion and stress resistant performance. According to the high-voltage divider of the invention, technological measures such as of compensation and shielding are adopted for the divider, and therefore, standard output of the divider can be ensured.

The invention relates to a high-voltage resistor type voltage dividing device, comprising a voltage dividing device body, a resistor layer, a buffering film, a high-voltage electrode and a grounding electrode, wherein the voltage dividing device body is in a cylindrical shape; the resistor layer covers the outside of the voltage dividing device body and is used for carrying out equal potential shielding on the voltage dividing device body; the buffering film covers the outside of the resistor layer and enables the voltage dividing device to have sticking and anti-stress performances; the high-voltage electrode is arranged at one end of the voltage dividing device body, which is connected with a high-voltage lead wire, in an upper cover shape, and is used for receiving a voltage signal sent by the high-voltage lead wire; and the grounding electrode is arranged on a grounding end of the voltage dividing device body in a lower cover shape and is used for replacing a ground wire. According to the high-voltage resistor type voltage dividing device, technical measures including compensation, shielding and the like are adopted for the voltage dividing device, so that the standard output of the voltage dividing device is guaranteed.

The invention relates to a nuclear magnetic resonance spectrometer gas circuit and temperature control system based on an LAN (Local Area Network) and a CAN (Controller Area Network) bus, belonging to a nuclear magnetic resonance spectrometer and providing a nuclear magnetic resonance spectrometer gas circuit and temperature control system based on the LAN and the CAN buses, with characteristics of strong independence and reliability, simpler structure, easy expansion, convenient maintenance, and the like. The nuclear magnetic resonance spectrometer gas circuit and temperature control system is provided with a central processing unit, a display unit, a CAN interface circuit, a rotating speed measuring circuit, a pneumatic valve drive circuit, a temperature measuring unit and a heating unit, wherein the central processing unit is connected with a computer; the central processing unit is connected with the display unit, the CAN interface circuit, the rotating speed measuring circuit, the pneumatic valve drive circuit, the temperature measuring unit and the heating circuit by adopting a standard CAN bus cable; the input end of the rotating speed measuring circuit is externally connected with a photoelectric rotating speed sensor, and the output end of the pneumatic valve drive circuit is externally connected with an electronic air valve; and the temperature measuring unit is externally connected with a thermoelectric couple, and the heating circuit is externally connected with a heating wire.

The invention provides an ignition cable shield which comprises a cable shielding layer composed of an outer layer, a middle layer and an inner layer in a combined mode. The cable shielding layer is composed of a stainless steel mesh sleeve (1), a corrugated metal belt (2), an insulating bush (3) and an anti-wave copper sleeve (4). According to the ignition cable shield, the cable shielding layer is excellent in quality and low in electromagnetic leakage; the outer cable protection layer is high in insulation strength, low in transmission loss, high in severe environment adaptability, capable of shielding stray radiation of ignition energy and also capable of effectively avoiding and preventing electromagnetic interference on other weak current equipment and electronic equipment on site; the defect that a traditional shielding mesh sleeve has a lot of electromagnetic leakage points is overcome, or the defects that the electromagnetic compatibility of a mesh sleeve plus a hose does not meet standards, the weight exceeds the standards and the bending performance is poor are overcome.

The invention relates to a film viewing device used for a medical image based on the internet of things. The film viewing device comprises a shell, a film viewing window which is arranged at the front surface of the shell and a lighting mechanism which is arranged in the shell. The lighting mechanism comprises a first lighting component and a second lighting component. The first lighting component comprises a vertically arranged fixing plate and multiple first lighting lamps. According to the film viewing device used for the medical image based on the internet of things, transmission gears are driven to rotate by driving gears and then transmission shafts correspondingly rotate in a following way, and the transmission shaft control transmission rods to realize angle adjustment of second lighting lamps so that lighting of a specific area can be realized and reliability of film viewing can be enhanced. Besides, the model type of an integrated circuit is BTS432D in a state indicating circuit, and the integrated circuit has high electromagnetic anti-interference capability so that anti-interference capability is ensured to be enhanced in the working process of the device and reliability of the device is enhanced.

The invention is applied to the field of invisible radomes, and particularly relates to a low-profile absorption / transmission integrated anti-interference device with an ultra-wide absorption band. The device comprises an absorption type metasurface, a band-pass type metasurface and two layers of dielectric substrates, wherein the absorption type metasurface is printed on the upper surface of the upper-layer dielectric substrate; the band-pass metasurface is printed on the upper surface of the lower-layer dielectric substrate; an air layer is arranged between the upper-layer dielectric substrate and the band-pass metasurface. A unit structure of the absorption type metasurface is composed of four 90-degree arc-shaped metal patches, and a patch resistor is loaded in a gap between every two adjacent arc-shaped metal patches. Each unit of the band-pass metasurface is formed by etching a cross-shaped gap in the center of a square metal patch. According to the invention, ultra-wideband absorption can be realized at a lower frequency band, low-loss transmission can be realized at a higher frequency band, the problem that a traditional metamaterial wave absorber cannot transmit signals is solved, and the anti-interference device has great significance in development of the fields of electromagnetic protection and invisible radomes.

The invention discloses an optical fiber liquid level sensor and a measuring method thereof. The optical fiber liquid level sensor comprises an elastic wafer, a threaded cylinder, an incident optical fiber and a receiving optical fiber, wherein the elastic wafer is stuck on the bottom part of the cylinder; the incident optical fiber and the receiving optical fiber are symmetrically stuck on the elastic wafer along the diameter direction; a gap is formed between the incident optical fiber and the receiving optical fiber. The optical fiber liquid level sensor and the measuring method have the beneficial effects that influence factors of liquid density variation and accelerated velocity on liquid level measurement can be eliminated, so that more accurate liquid level information is obtained. According to the optical fiber liquid level sensor, the liquid level information is measured in a non-contact manner, so that the measurement is not restricted by properties of to-be-measured liquid, the possibility of explosion risk caused by electric sparks generated due to electrical measurement is prevented, therefore the anti-explosion performance is realized; meanwhile, a sensing part is easily installed, the price is low, the situation that the sensing part of the optical fiber sensor is polluted by the liquid is prevented, the stability of the sensor in the measurement process is guaranteed to a certain extent, and the electromagnetic interference resistance performance is good.

The invention provides a high-temperature- and high-voltage-resistant high-insulating-property ignition cable, and aims to provide an electromagnetic shielding ignition cable which has strong adaptability to severe environment, small in electromagnetic leakage, high in medium insulation strength and low in transmission loss, can shield stray radiation of ignition energy, can reach high insulation of 20kV in direct current withstand voltage, and can achieve shielding effectiveness of above 50dB. The ignition cable is realized through the following technical scheme: a nickel-core conductor penetrates through an inner-layer insulator, a glass fiber which serves as one of the insulators wraps the nickel-core conductor, the insulator passes through a middle layer corrugated metal hose whose outer layer has a mesh sleeve woven and is wrapped between the nickel-core conductor and the corrugated metal hose, alumina powder is filled in an inner gap between an outer surface of the glass fiber that penetrates into an inner wall of the corrugated metal hose and an inner surface of the corrugated metal hose, and an outer layer shielding body has the metal stainless steel mesh sleeve woven. The high-temperature- and high-voltage-resistant high-insulating-property ignition cable overcomes the defects that a traditional ceramic insulator cable is poor in bending performance, high-altitude performance and anti-mechanical vibration capability and electromagnetic leakage cannot be avoided.

The invention discloses a lightning-protection optical cable comprising a cable core and a coating layer, wherein the cable core is used for transmitting optical signals and electric power; and the coating layer comprises a shielding layer for shielding the cable core, an outer sheath for covering the shielding layer, and a grounding layer arranged between the cable core and the shielding layer. In the invention, the lightning-protection optical cable can prevent lightning from damaging communication equipment, and effectively shield an electromagnetic field generated by the cable from interfering other communication cable signals and an outer electromagnetic field from interfering the cable.

The invention relates to a method for controlling an LED lamp (100) and to an LED lamp (100) suitable therefor. The LED lamp (100) comprises at least a first LED assembly (1) and a second LED assembly (2). During operation, the first LED assembly (1) and the second LED assembly (2) emit light having different light spectra and the first LED assembly (1) preferably emits a higher blue light component than the second LED assembly (2). The components of the light emitted by the first LED assembly (1) and the second LED assembly (2) within a total light spectrum of the LED assemblies (1, 2) are controlled in accordance with a specified spectrum control curve (STK). When a change signal is received from a user interface, the spectrum control curve (STK) is at least locally modified and said local modification is automatically taken into consideration, at least partially, in a subsequent new run of the spectrum control curve (STK).

The invention discloses a controller of an electric compressor. Among them, it includes: a weak electric area, a strong electric area, and an isolated optocoupler; wherein, the weak electric area and the strong electric area are connected through the isolated optocoupler; the weak electric area is powered by a low-voltage power supply, and the strong electric area is powered by A high-voltage power supply supplies power, and the weak current area and the strong electric area do not share the same ground. Applying the technical scheme of the present invention can realize the complete isolation of strong current and weak current of the electric compressor controller without mutual influence, improve the reliability of the product, improve the electromagnetic immunity of the product, and the main control chip will not be affected by the electromagnetic interference of the motor. interference.

The invention discloses a multigroup lightning protection optical cable which comprises cables and a coating layer covering the cables, wherein the cables are made of multigroup cable cores covered by an inside liner; and the coating layer comprises a shielding layer for shielding the cables, an outer jacket covering the shielding layer and a grounding layer arranged between the inside liner and the shielding layer. The multigroup lightning protection optical cable can prevent lightning from damaging communication equipment, and can effectively shield the interference of an electric magnetic field generated by the cables on other communication cable signals and the interference of an external magnetic field on the cables.

The invention discloses an optical fiber liquid level sensor and a measuring method thereof. The optical fiber liquid level sensor comprises an elastic wafer, a threaded cylinder, an incident optical fiber and a receiving optical fiber, wherein the elastic wafer is stuck on the bottom part of the cylinder; the incident optical fiber and the receiving optical fiber are symmetrically stuck on the elastic wafer along the diameter direction; a gap is formed between the incident optical fiber and the receiving optical fiber. The optical fiber liquid level sensor and the measuring method have the beneficial effects that influence factors of liquid density variation and accelerated velocity on liquid level measurement can be eliminated, so that more accurate liquid level information is obtained. According to the optical fiber liquid level sensor, the liquid level information is measured in a non-contact manner, so that the measurement is not restricted by properties of to-be-measured liquid, the possibility of explosion risk caused by electric sparks generated due to electrical measurement is prevented, therefore the anti-explosion performance is realized; meanwhile, a sensing part is easily installed, the price is low, the situation that the sensing part of the optical fiber sensor is polluted by the liquid is prevented, the stability of the sensor in the measurement process is guaranteed to a certain extent, and the electromagnetic interference resistance performance is good.

The present invention belongs to the field of radiation detection technology. The radiation imaging array solid detector includes flash crystal of cesium iodide or cadmium tungstate, photodiode coupled with the flash crystal and casing holding the flash crystal and the photodiode. The casing consists of metal cover plate, metal bottom plate, front end cover, back end cover and two side plates. The metal cover plate is provided with several slots for heavy metal partitions to set in and to separate flash crystals to form several solid detectors. The photodiode is led out through insulators penetrating the metal bottom plate and rubber pad, and there are rubber pads for insulation between different parts. Compared with available technology, the present invention has high detection efficiency, simple production process, less dead area and other advantages.

The invention discloses an acoustomagnetic anti-theft system capable of resisting electromagnetic interference. The system comprises an antenna body and at least two wave absorption layers used for absorbing electromagnetic wave signals within a first frequency range; the antenna body is provided with a first surface used for transmitting an electromagnetic wave signal to an acoustomagnetic sensorand / or receiving the electromagnetic wave signal transmitted by the acoustomagnetic sensor, and at least two second surfaces used for corresponding to at least two electromagnetic interference sources one to one; the second surfaces and the first surface are located on different sides of the antenna body; the wave absorption layers are used for being correspondingly arranged between the second surfaces and the electromagnetic interference sources, facing the corresponding second surfaces or covering the electromagnetic interference sources; the first frequency range is consistent with the work frequency range of the antenna body and electromagnetic interference frequency ranges of the electromagnetic interference sources. The detection distance between the acoustomagnetic anti-theft system and an acoustomagnetic soft label cannot be greatly reduced, and therefore the acoustomagnetic anti-theft system is beneficial for being matched with acoustomagnetic soft labels for using.

The invention discloses a multi-parallel inverter motor speed regulating system and a control method of the multi-parallel inverter motor speed regulating system. The system is formed by connecting multiple inverter modules in parallel. The direct current sides of multiple inverter sub modules are directly connected with a direct current power supply with a direct current bus capacitor in parallel. The alternating current sides of the multiple inverter sub modules are connected with multiple sets of smoothing reactors respectively in series and then directly connected in parallel to drive an alternating current motor. By the adoption of the structure, modularization expansion of the motor speed regulating system is easily conducted, and the fault-tolerance performance of the motor speed regulating system is enhanced. By means of a random SVPWM method based on carrier phase shifting, switching frequency of parallel inverters is equivalently improved, switching subharmonic energy within narrow frequency bands is equalized, the harmonic performance of output currents of the parallel inverters is improved, and electromagnetic interference resistance of the motor speed regulating system is enhanced. By the adoption of a space vector synthetic technology for dynamically allocating SVPWM zero vectors, zero-sequence circulating currents between the parallel inverter modules are effectively eliminated, and normal operation of the system is guaranteed.

The invention relates to a power inductor core with a closed magnetic circuit structure. The power inductor core comprises a magnetic base and a magnetic cover, wherein the magnetic cover is fastened to the magnetic base; a magnetic core integrated with the magnetic base is arranged at the center part of the magnetic base; a groove for placing a coil is formed in the periphery of the magnetic core; notches for leading out a coil connector are formed in the edge parts of the groove; and gaps for installing a terminal are reserved at the parts, corresponding to the notches, of the magnetic cover. The invention provides a low-loss and high-current Ni-Zn ferrite core applied to a design of a power inductor product; the design of the low-loss power inductor is achieved; and the product achieves simultaneous matching of low loss, high power and production automation.

The invention relates to a medical image viewing device capable of being applied in internet of things. The medical image viewing device comprises a shell, a viewing window arranged at the front of the shell, and an illumination mechanism arranged in the shell; the illumination mechanism comprises a first illumination module and a second illumination module; the first illumination module comprisesa vertically arranged fixed plate and a plurality of first illuminating lamps; in the medical image viewing device based on the internet of things, a transmission gear is driven to rotate by a driving gear, and then a transmission shaft can correspondingly rotate, the transmission shaft controls a transmission rod to realize the angle adjusting of a second illuminating lamp, thereby illuminatinga specific region and improving viewing reliability. Not only that, the model of an integrated circuit is BTS432D in a state indication circuit, and the integrated circuit has high electromagnetic interference resistance, thereby guaranteeing that the interference resistance and the device reliability are improved in the work process of the device.

The invention provides a method for operating an LED lamp (100) and an LED lamp (100) suitable for the method. The LED lamp (100) comprises at least one first LED assembly (1) and a second LED assembly (2), wherein the first LED assembly (1) and the second LED assembly (2) emit lights with different spectrums during operation , and it is preferred that the proportion of blue light emitted by the first LED component (1) is higher than that of the second LED component (2). Controlling the light emitted by the first LED assembly (1) and the second LED assembly (2) in the LED assembly (1, 2) according to the preset spectral control curve (STK) with respect to time, preferably physiological periodicity The specific gravity within the total spectrum. In case a change signal is received from the user interface, the spectral control curve (STK) is changed at least locally, and this local change is at least partially taken into account automatically when the spectral control curve (STK) is subsequently re-run.

The utility model belongs to the technical field of fire detection, and discloses an anti-interference temperature and gas composite linear fire detector, which comprises an anti-interference temperature sensing cable, a temperature and gas detection unit and a signal processing unit, and is characterized in that the anti-interference temperature sensing cable comprises a power wire core, a metal wire core and a grounding metal wire core; the temperature and gas detection unit is in cascade connection with a grounding metal wire core of the anti-interference temperature sensing cable, the temperature and gas detection unit is configured to collect the combustible gas content, the temperature value and the position information of a protected object, and the signal processing unit is electrically connected with the temperature and gas detection unit and used for receiving data collected by the temperature detection unit for early warning. According to the anti-interference temperature and gas composite linear fire detector, numerical values collected by the temperature and gas detection unit are transmitted to the signal processing unit through the power line core, so that the signal processing unit can display the operation state, a fire alarm signal and a fault signal in real time, fire characteristics are extracted in time, and the occurrence of large-scale fire disasters is reduced.

The invention relates to a nuclear magnetic resonance spectrometer gas circuit and temperature control system based on an LAN (Local Area Network) and a CAN (Controller Area Network) bus, belonging to a nuclear magnetic resonance spectrometer and providing a nuclear magnetic resonance spectrometer gas circuit and temperature control system based on the LAN and the CAN buses, with characteristics of strong independence and reliability, simpler structure, easy expansion, convenient maintenance, and the like. The nuclear magnetic resonance spectrometer gas circuit and temperature control system is provided with a central processing unit, a display unit, a CAN interface circuit, a rotating speed measuring circuit, a pneumatic valve drive circuit, a temperature measuring unit and a heating unit, wherein the central processing unit is connected with a computer; the central processing unit is connected with the display unit, the CAN interface circuit, the rotating speed measuring circuit, the pneumatic valve drive circuit, the temperature measuring unit and the heating circuit by adopting a standard CAN bus cable; the input end of the rotating speed measuring circuit is externally connected with a photoelectric rotating speed sensor, and the output end of the pneumatic valve drive circuit is externally connected with an electronic air valve; and the temperature measuring unit is externally connected with a thermoelectric couple, and the heating circuit is externally connected with a heating wire.

The present invention relates to radiation detection technology. The connecting device for detector module circuit in container detecting system includes comprehensive cable, connectors connected to two ends of the comprehensive cable and connecting sockets mounted onto the end oft detector module and matching the connectors. Structurally, the connecting device features the comprehensive cable including several power source lines and several signal lines, the connectors with several convex contacts in the ends for connection with the power source lines and the signal lines, and the connecting sockets with corresponding concave contacts intelligent ends. Compared with available technology, the present invention has simple cable installation and connection, low cost, raised safety and raised electromagnetic interference resisting performance.

The invention discloses a packaging substrate magnet burying method and a packaging substrate. The magnetic embedding method for the packaging substrate comprises the following steps: S100, forming a first mounting hole in a core plate; s200, filling the first mounting hole with a magnetic material and carrying out curing treatment to form a magnetic core; s300, forming a second mounting hole in the core plate, wherein the second mounting hole penetrates through the magnetic core; s400, carrying out copper deposition and electroplating treatment on the core plate; s500, the second mounting hole is filled with a resin material, and curing treatment is carried out; and S600, carrying out copper deposition and electroplating treatment on the core plate. According to the packaging substrate magnetic embedding method, the flexible magnetic material is embedded, so that the magnetic material is efficiently embedded into the packaging substrate, and remarkable performance improvement and efficiency optimization are realized. The requirement of embedding of the magnetic material on the precision of a mounting hole is low, the attaching effect of the magnetic material and the hole wall is good, a gap is not prone to being generated between the magnetic core and the hole wall, and therefore the good electromagnetic anti-interference effect is achieved.

The invention is suitable for the technical field of Bluetooth antennas and provides a Bluetooth antenna device of a three-dimensional structure and Bluetooth equipment. The Bluetooth antenna device comprises a PCB substrate of a multi-layer structure which is provided with a first antenna reference ground and a second antenna reference ground, a first metal edge covering structure, a second metaledge covering structure, a third metal edge covering structure, a first antenna structure, a second antenna structure and a through hole having a conductor characteristic, wherein the first antenna reference ground and the second antenna reference ground are connected through the first metal edge covering structure, the first antenna structure comprises at least two antenna line segments etched on the PCB substrate, in the first antenna structure, two adjacent antenna line segments are connected through the second metal edge covering structure and the third metal edge covering structure, thesecond antenna structure comprises an antenna line segment etched on the PCB substrate,, and the first antenna structure is connected with the second antenna structure through the through hole. The Bluetooth antenna device has the advantages of being small in structural size, low in cost, good in parameter consistency, high in anti-electromagnetic interference capacity and the like.

The invention belongs to the technical field of instrument detection, and provides an anti-interference detection method, circuit and electronic equipment for leak detection equipment, wherein the anti-interference detection method for leak detection equipment comprises the steps of: selecting a frequency band for a collected input signal , obtain a target frequency segment, the input signal includes an audio signal and a display signal; amplify the audio signal of the target frequency segment through the first branch and output the target audio information, and convert all the target frequency segment. The display signal is amplified by the second branch and then outputs the target display information. The invention achieves the effect of improving the anti-interference ability of the environment by selecting the frequency band of the collected input signal according to the on-site environment; and divides the input signal into two independent signals and processes them through two independent branches to prevent the interference between the signals. Mutual interference, thereby improving the electromagnetic anti-interference ability of the instrument itself, ensuring the authenticity of the audio signal, thereby improving the accuracy of the instrument test.

A hands-off detection pad assembly for a steering wheel includes a shield layer including shield elements in a mesh or continuous form, and a detection layer including detection elements in a mesh form arranged around the shield elements. The detection elements have a line width less than or equal to 0.30 millimeters and a line spacing less than or equal to 0.30 millimeters. A steering wheel including the hands-off detection pad assembly is also disclosed.

The invention discloses a method and a device for checking electromagnetic compatibility of a stabilized voltage power supply of a switch. The method comprises the following steps: bridge connecting an RC loop between a primary and a secondary of the power supply; checking the voltage waveform at the both ends of resistators on the RC loop; and judging the electromagnetic compatibility of the stabilized voltage power supply of the switch according to the checked voltage waveform. By the invention, the electromagnetic compatibility of the stabilized voltage power supply of the switch can be checked conveniently and rapidly in a low cost.