175results about How to "Shield electromagnetic interference" patented technology

The invention belongs to the field of online monitoring of transformers, and particularly relates to a device and a method for monitoring the grounding current of a transformer core/clamp based on wireless communication. A straight-through current transformer and a device working circuit board are arranged in a shell. The upper part of the shell is connected with a housing top cover. A display screen is arranged on the housing top cover, and is connected to a controller. An external wireless communication module antenna is led from the shell. The device and the method can be used for monitoring data in real time, have functions of current ultralimit alarming, data information storage, system clock synchronization, parameter configuration and the like, and can be widely applied to the online monitoring of the grounding current of a core/clamp of electric equipment such as a transformer and a reactor, possible failures can be timely discovered, and the routing inspection work of an operator can be reduced or replaced.

The invention discloses a socket connector, a plug connector and a combination structure thereof. The socket connector includes a first insulating body, a first shielding sheet, two rows of first contact terminals and a first shielding casing. The plug connector includes a second insulating body, a second shielding sheet, two rows of second contact terminals, at least one contact spring sheet and a second shielding casing. Through arrangement of the contact spring sheets in the plug connector, contact faces of the first shielding sheet are cooperated to expose side faces of a first clapper and during mutual-insert combination, the front ends of the contact spring sheets elastically abut against the contact faces so that a grounding circuit is formed through the contact connection and thus electromagnetic interferences, between the upper and lower rows of the contact terminals, caused when high-frequency signals are transmitted can be well shielded and the stability of transmission of the high-frequency signals is ensured better; and at the same time, the plug-in and plug-out forces of the connectors can be strengthened effectively and because the contact spring sheets and the contact faces are all made of metal materials, a demand of long plug-in and plug-out service lives of the connectors is met and the service life of the product is longer. The socket connector, the plug connector and the combination structure thereof are also capable of satisfying positive and reverse plug-in and plug-out.

The invention discloses a method for testing low-frequency noise of an amorphous silicon membrane, and specifically relates to a testing technology of low-frequency current noise of the amorphous silicon membrane. A testing system adopted by the testing technology comprises a biasing circuit, an electromagnetic shielding device, a noise amplifying system and a data acquisition and processing system. Firstly, the low-frequency current noise of the amorphous silicon membrane is motivated through the biasing circuit, sample low-frequency noise is amplified through a low-frequency noise current amplifier, amplified noise signals are acquired through a data acquisition card, corresponding current noise signal power spectral density is calculated, finally data are analyzed and processed through a computer, and a power spectral density curve of the low-frequency noise of the amorphous silicon membrane is obtained. The method for testing the low-frequency noise of the amorphous silicon membrane can be used for testing the low-frequency noise of the amorphous silicon membrane repeatedly and accurately, and is fast and convenient.

The invention belongs to the field of mobile communication, and relates to a wireless communication module, in particular to a high-performance small-sized module of a code division multiple access (CDMA) evolution-data optimized (EV-DO) mobile terminal. The small-sized module is applicable to a third generation (3G) user terminal. The wireless communication module is characterized in that: board-level connection is carried out by ball grid array (BGA) package; the level of integration is high; the size is small; good electrical performance and an external interface function are realized; and requirements of a customer can be well met. The wireless communication module comprises a radio frequency front end, a transmitting and receiving channel, a base band processing part, a memory and a power manager, wherein the base band processing part and the radio frequency front end are placed on a top layer of a circuit board; a shielding cover is arranged on the top layer to guarantee an excellent electromagnetic compatibility function of the module; the memory is placed on a bottom layer of the circuit board; and the bottom layer adopts an advanced BGA technology to guarantee reliable connection during the application of the module.

The invention discloses an electrocardiogram cable and a manufacturing method thereof. The electrocardiogram cable comprises a strengthening wire on which a plurality of side-by-side copper wires are spirally wound, wherein an acrylic insulating resin is covered on the outer surface of the strengthening wire to form an electrocardiogram inductor. An ethylene carbon resin layer and an insulated vinyl resin layer can be coated on the outer surface of the electrocardiogram conductor in turn, and the side-by-side copper wires are spirally wound on the outer surface of the electrocardiogram conductor; a human body connection terminal can be connected to one end of the electrocardiogram conductor in a pressing mode, the other end of the electrocardiogram conductor is connected with an electric wire tail end of a multi-core electromagnetic shielding wire through a resistor, and the resistor is subjected to shielding treatment; and a plug and an annular magnetic ring for an electrocardiogram machine are connected to the other end of the multi-core electromagnetic shielding wire. A signal amplifier and an analog/digital (A/D) converter are arranged between the electrocardiogram conductor and the multi-core electromagnetic shielding wire in turn. By the electrocardiogram cable, the bending resistance and the tensile strength of the cable are enhanced, and the using cost is reduced; electromagnetic interferences can be well shielded, and the signal stability and the accuracy are improved; lead pollution is avoided, so that the electrocardiogram cable is relatively environment-friendly; and the electrocardiogram cable can be connected with a personal computer (PC) to manufacture electrocardiograms.

The invention belongs to the technical field of atomic clocks and frequency standards and particularly relates to a single electron atom light clock and a preparation method thereof. In the technical scheme adopted by the invention, transition of a laser frequency band between a ground state and a second excited state of a single electron atom is used as a quantum frequency standard of an optical frequency band and an optical comb is combined to obtain the light clock implemented after the frequency is transferred. In the scheme, a cesium atom is used as an example, the narrow spectrum line width characteristic of the second excited state of the cesium atom can be utilized, and a magnetic sub energy level in an outer magnetic field generated by a coil can be decomposed out for laser frequency stabilization. Temperatures of the magnetic field and an atomic furnace can be controlled to optimize a system to enable the system to be in a good working state. Additionally, due to the housing design of the system, electromagnetic interference of the outside can be shielded. By regulating the current and the temperature of a semiconductor laser and controlling the voltage of a piezoelectric ceramic with a cavity length, the final output frequency of laser is stabilized on a transition spectral line of the cesium atom, which has a wavelength of 459nm from 6S to 7P1/2 or 455nm from 6S to 7P3/2.

The invention relates to a power joint device. The device comprises a joint body, a power device and a measuring device; the measuring device comprises a first angular measuring device, the first angular measuring device comprises a first magnet and a first magnetic field induction circuit, the first magnet is connected with one end of a motor output shaft, and is close to a first motor cover plate, the first magnetic field induction circuit is arranged on the inner side of the first motor cover plate and is close to the first magnet, a motor rotates to drive the motor output shaft to rotate,and further drive the first magnet to rotate, and the first magnetic field induction circuit induces the rotating angle of the first magnet so as to measure the rotating angle of the motor. Through the first magnet and the first magnetic field induction circuit which are in the non-contact coupling manner, measuring of the motor rotating angle is achieved, mechanical friction losses are avoided, simpleness, lightness, thinness and low cost are achieved, compared with an existing integrated type encoder scheme, mechanical structural design complexity is greatly simplified, a magnetic field generated by the magnet is a static magnetic field, the environment interference influence is avoided, and reliability is high.

The invention features the following: using metallic filament ball to fill the gap between cables or between cable and bulkhead, and filling the conducting daub and sealant at both side of the metallic filament ball; and further, the cable, conducting daub, sealant and metallic filament are loaded together into a cable pipe, and the cable pipe passes through the bulkhead and makes a sealed connection with the bulkhead.

The invention provides an on screen display data electromagnetic compatible test system and method. The system comprises a test unit, a data acquisition unit, a shooting monitoring unit, and an on screen control unit, wherein the data acquisition unit is used for obtaining first test data generated by the test unit, extracting the target data in the first test data to generate second test data, and sending the second test data to the on screen control unit; the shooting monitoring unit is used for performing video monitoring on the area to be tested, and sending obtained video data to the on screen control unit; the on screen control unit is used for displaying received second test data and video data on a same screen. The on screen display data electromagnetic compatible test system can realize simultaneous display of test data and monitoring videos, and provide great convenience for test personnel.

The present invention provides a photoelectric sensor package and a package method thereof, and relates to the field of sensors. The photoelectric sensor package comprises an upper housing with a light transmitting window and a lower housing being in seal connection with the upper housing; the light transmitting window is provided with a light transmitting quartz glass sheet; a location thermal insulation seal cover is arranged between the quartz glass sheet and a photoelectric sensor and is configured to fix the photoelectric sensor and the light transmitting quartz glass sheet, and the location thermal insulation seal cover is internally provided with a cavity configured to hold anhydrous nitrogen and oxygen mixed protection gas; the photoelectric sensor package further comprises a semiconductor refrigeration sheet, a cold end plane of the semiconductor refrigeration sheet is provided with an electromagnetic shielding temperature guidance plate made of metal materials with a good temperature guidance effect, and one side of the electromagnetic shielding temperature guidance plate is butted against the photoelectric sensor to transmit a low temperature at the cold end of the semiconductor refrigeration sheet to the photoelectric sensor.

The present invention provides a plastic laser front case penetrating welding vehicle-mounted camera, the front case and a rear case are welded together, and no additional waterproof components are needed, and external moisture is completely prevented from entering inside of a body, and overall heat dissipation performance is good, and external electromagnetic interference can be shielded. The vehicle-mounted camera includes the front case, the rear case, a first substrate, and a second substrate. The front case and the rear case are both made of plastic materials, a front end of the front case is fixedly arranged with a front convex lens, an inner groove is disposed on an outer circumference of a rear end surface of a front case side convex for positioning the rear case, and a front end surface of the side convex end corresponding to the inner groove is a plane, and a portion of the rear case facing the inner groove is a bulge for positioning, the first substrate is fixedly installedon a rear substrate mounting member of the front case, the second substrate is fixedly installed on a corresponding substrate mounting member of the rear case, and a first rear end connector of the first substrate is connected to a front end slot of the second substrate.

The invention discloses a display screen gesture control circuit and method based on capacitive sensing. The circuit includes a display screen and sensors arranged around the display screen. The sensors are arranged in strips, and a shielding layer is provided around each sensor. Multiple sensors output sensing signals to the detection circuit; the ground terminal of the display screen is disconnected from the ground, and the ground terminal of the display screen, the sensor and the shielding layer are all connected to the oscillating signal source. The method comprises the detection circuit detecting the signal output by the sensor, and determining the current working sensor; loading an oscillating voltage signal to the non-working sensor, so that the non-working sensor and the current working sensor are loaded with the voltage signal Synchronous oscillation; the detection circuit detects the signal output by the currently working sensor, and determines the gesture according to the change of the signal output by the currently working sensor. The invention can accurately detect the change of the gesture of the user, and the production cost is low.

The invention aims at providing an air conditioner for an electric coach with improvement of reliability of an electric appliance component; a compressor, a power transforming device and an electric appliance control part are provided with a closed metal shell for an electric cabinet with shielding function; a core body of an evaporator and an evaporating blower are provided with a shell of the evaporator outside; a cooling metal pipeline is arranged between the metal shell of the electric cabinet; one interface of the cooling metal pipeline is arranged on the shell of the core body of the evaporator and the other interface is arranged on the metal shell of the electric cabinet; the other end of the metal shell of the electric cabinet is provided with an air outlet with an downward opening.

The invention discloses a low-smoke halogen-free polyolefin insulated and shielded cable, which comprises a conductive core, an isolating guide layer, an insulating sheath layer, a shielding sheath layer and an outer protecting sleeve layer. A preparation method of the low-smoke halogen-free polyolefin insulated and shielded cable comprises a wire drawing procedure, a wire bundling procedure, a compound stranding procedure, an isolating guide layer process, an insulating sheath layer process, a shielding sheath layer process and an outer protecting sleeve layer process. By the low-smoke halogen-free polyolefin insulated and shielded cable and the preparation method thereof, the cable can have good anti-stretching and anti-bending properties, high temperature resistant and flame retardant properties and good insulating and shielding properties, can effectively shield the interference of external electromagnetism and the like, improves the transmission quality of the cable and is long in service lifetime and beneficial to popularization and application.

The invention discloses an electronic throttle valve body of a diesel engine. The electronic throttle valve body comprises a main body, a printed circuit board of a control circuit, a throttle valve sheet, a limiting block, a bearing, a throttle valve shaft assembly, a magnet assembly, a socket assembly, a resetting gear assembly, a direct-current motor, a resetting spring and a dustproof cover. The printed circuit board of the control circuit is welded on the socket assembly; a limiting board is formed on a throttle valve shaft through injection molding so as to form the throttle valve shaft assembly; a resetting gear is welded on the throttle valve shaft assembly; the throttle valve shaft assembly is assembled on the throttle valve body through the bearing; and the throttle valve sheet is inserted into the throttle valve shaft and is linked through a screw. The direct-current motor is mounted in the main body through the socket assembly in a pressing manner. The resetting spring is located below the resetting gear assembly. One stand bar of the resetting spring is hung on the main body, and the other stand bar is hung on the resetting gear assembly. The electronic throttle valve body disclosed by the invention is not influenced by a magnetic field. Furthermore, an entire control system is sealed in a cavity. Compared with the prior art, a protection cover is manufactured by a metal board with higher magnetic conductivity, so that the electronic throttle valve body can be used for shielding external electromagnetic interferences.

The invention is suitable for the technical field of public address systems, and provides a microphone, which comprises a power supply module, an audio signal amplification unit connected with the power supply module, an input module used for inputting reminding time information by a user, a microcontroller connected with the input module and used for monitoring the reminding time information input by the user and sending a reminding control signal when reaching the reminding time, and a reminding module connected with the microcontroller and used for controlling the work by the reminding control signal of the microcontroller, wherein the input module, the microcontroller and the reminding module are connected with the power supply module. The reminding module is arranged in the microphone, when the set reminding time reaches, the reminding module reminds the user, and therefore, the user can be well helped to control the time and the rhythm of a speech, and can be applied to a wired microphone and a radio microphone.

The invention discloses a large-capacity inverter module with high-current/high-voltage IGBTs directly connected in parallel. The large-capacity inverter module comprises a water-cooled plate, discrete IGBT devices, a laminated busbar, a first absorbing capacitor, a driving loop, an AC side convergence busbar, a current sensor, a DC side laminated busbar, a second absorbing capacitor, a DC side negative convergence busbar and a DC side positive convergence busbar, wherein the number of the discrete IGBT devices is six, and the six discrete IGBT devices are sequentially and evenly arranged on the water cooling plate from top to bottom. The large-capacity inverter module with the high-current/high-voltage IGBTs directly connected in parallel have the advantages that the calculation of current impedance of the branch circuits connected in parallel is precise, the consistency is guaranteed, a high current sharing coefficient is realized, the cable lengths of the devices of different phasesof the driving loop are identical, and the paths are separated and do not interfere with one another; and the large-capacity inverter module adopts a main loop layout design, makes full use of space,optimizes circuit paths, is high in power density, has small overall module size, is simple, is convenient to maintain and install, and has good electrical properties.

The invention relates to an orthogonal signal quadruplicated frequency counting method with a filter function, and relates to an orthogonal signal quadruplicated frequency counting method. The invention aims at solving the problem of the prior art that counting mistake is caused by interference of burrs which are easily introduced by shortage of a filter function. A counter, a signal shifting register A and a signal shifting register B are initialized, the signal shifting register A and the signal shifting register B are shifted for one bit at each clock edge, and values stored in the signal shifting register A and the signal shifting register B are used for analyzing whether the edge of a signal A or a signal B exists or not. If the edge of the signal A or the signal B exists, the level of another phase of signal is detected according to the edge of the current signal A or the signal B so as to judge the steering of a motor; when the motor rotates in reverse, the counter is minus one; and when the motor rotates normally, the counter is plus one and waits for a next clock. The method is used for counting the orthogonal signal quadruplicated frequency.

The invention discloses an anti-electromagnetic interference system for an electric car compressor. A filter is connected to a high-voltage power supply wire harness of the compressor in series; useless or even harmful frequency components in a signal are filtered out; the interference to the compressor in the electrifying process of a direct-current bus of the compressor is removed; and in addition, grounding treatment is carried out on a compressor housing, so that the effects on the electric compressor caused by electromagnetic interference which propagates through space are effectively inhibited.

The invention discloses a high-strength aviation impact-resistant anti-vibration shielding cabinet, and relates to the technical field of aviation shielding cabinet equipment. The cabinet comprises two parallel side plates (1) and a rectangular frame (2), and the rectangular frame (2) is installed between the two parallel side plates (1) in a parallel manner. The rectangular frame (2) comprises a sealing cross beam (3) and a reinforcing vertical beam (4), which are connected through a riveting block to form the rectangular frame (2). The sealing cross beam (3) comprises a cross beam main body (31), and the cross beam main body (31) is provided with a circular bottom hole (32) for installing a steel wire thread sleeve, a flat hole (33) for installing a riveting block (5), a irregularly-shaped hole (34) for installing a nut bar (6), wherein the irregularly-shaped hole (34) is located at an inner side of the cross beam main body (31). The cabinet is advantageous in that the cabinet guarantees the overall strength of the cross beam main body (3) and the reinforcing vertical beam, and improves the work stability.

The invention discloses a flame-proof type frequency conversion integrated permanent-magnet synchronous motor, which comprises a motor base and a frequency conversion control cabinet, wherein the frequency conversion control cabinet is welded on the motor base; and a frequency converter is mounted in the frequency conversion control cabinet. The inside of the frequency conversion control cabinet is divided into a first cavity, a second cavity and a third cavity through separation plates; the motor base comprises a cylinder and an end cap; the cylinder is formed by an inner cylinder and an outer cylinder which are sleeved together; the inner cylinder and the outer cylinder are integrally welded in an interference fit manner; a spiral groove is formed on the outer cylinder surface of the inner cylinder; the end cap comprises a first end cap and a second end cap which are respectively located at two ends of the cylinder and a third end cap located inside the cylinder; a rotor and a stator are arranged between the first end cap and the third end cap; and an input reactor and an output reactor are arranged between the third end cap and the second end cap. The permanent-magnet synchronous motor is novel in structure, is reasonable and compact, can effectively utilize the limited space, is compact in product structure, high in power factor, efficiency and power density, and can effectively reduce the motor volume and the energy consumption.