1585results about How to "Avoid electromagnetic interference" patented technology

The present invention is directed to an improved pulse oximetry sensor device, in which the top and bottom portions of the sensor housing are affixed at a crease point, and are foldable towards each other to create an enclosure therebetween for retaining the optical elements of the device. The sensor housing may then be affixed to a patient by any number of methods, including using adhesive on a flexible strap, or by using a Velcro® strap on a flexible strap. Additionally discussed is a method of manufacturing such a device, and methods to reduce the manufacturing costs of an otherwise disposable device.

A compound touch panel comprises a capacitive touch panel unit; a resistive touch panel unit and a signal processing unit; the capacitive touch panel unit is overlapped with the resistive touch panel unit; sensing signals from the capacitive touch panel unit and resistive touch panel unit being transferred to the signal processing unit; the signal processing unit having at least one signal determining loop for determining the sensing signals being from the capacitive touch panel unit or the resistive touch panel unit so as to select a predetermined signal processing mode. Or the signal processing unit having a manual operated signal switch for selecting a signal processing mode based on whether sensing signals are from the capacitive touch panel unit or resistive touch panel unit. When the capacitive touch panel unit is selected from receiving signals, the conductive films of the resistive touch panel unit are jumped for grounding.

The invention provides a speed changing magnetic pump, which comprises a pump body, a speed changing magnetic transmission device installed in a casing cavity and a driving motor. The speed changing magnetic transmission device comprises an inner magnetic rotor, an outer magnetic rotor, an isolation sleeve and a magnetic field adjusting ring. The inner magnetic rotor comprises an inner magnetic rotor magnet ring and an inner magnetic rotor magnet core, the outer magnetic rotor comprises an outer magnetic rotor magnet core and an outer magnetic rotor magnet ring which forms an annular cavity with the inner magnetic rotor magnet ring, and the isolation sleeve fixedly connected with a pump body is arranged in the annular cavity. The magnetic field adjusting ring fixedly installed on the isolation sleeve is an annular body formed by connecting a plurality of magnet core blocks and a plurality of epoxy blocks at intervals and used for adjusting magnetic fields of the inner magnetic rotor and the outer magnetic rotor to enable the rotating speed of an output rotating shaft connected to an impeller in a pump body to be different from the rotating speed of an input rotating shaft connected to the driving motor.

An integrated circuit device has a substrate, an interconnection level, a shielding level and a plurality of stitching studs. The substrate has a plurality of active devices, and the stitching studs pass through the substrate. The interconnection level is on the substrate, having a plurality of metal lines to provide interconnections between the active devices with a plurality of plugs. The shielding level is on the interconnection level, having an electromagnetic shielding pattern. The electromagnetic shielding pattern, the plugs, and the stitching studs are connected to form an electromagnetic shielding housing of the integrated circuit device.

An advantage of the present invention is to provide an adapter power supply which varies a link voltage of DC power serving an input power of a DC / DC converter according to variation of a load current estimated by measuring a secondary current using a lossless current measurement technique at a primary terminal of a transformer of the DC / DC converter and thus presuming a load current of an output power.An adapter power supply according to present invention may include an AC / DC converter converting a commercial AC power into a DC power; a DC / DC converter including a transformer composed of a primary terminal and a secondary terminal in order to output an output power by converting a link voltage of the DC power; and a controller presuming a load current of the output power through a primary current of the transformer and varying the link voltage of the DC power according to variation of the estimated load current.

The system relates to an indoor positioning method, an indoor positioning apparatus and an indoor positioning system. The method comprises the steps of taking an indoor picture; acquiring characteristic information of an image of an LED light source according to the picture; taking at least preset number of communication images of the LED light source at a speed of a preset frame to acquire identification information uniquely corresponding to the LED light source; determining a position of a picture-taking spot in relative to the LED light source according to the characteristic information corresponding to the LED light source and an image-forming principle; determining an indoor position of the LED light source according to the identification information of the LED light source and an indoor layout diagram; and acquiring the indoor position of the picture-taking spot according to the indoor position of the LED light source and the position of the picture-taking spot in relative to the LED light source. Electromagnetic interference can be prevented because the indoor positioning method is in no need of installing wireless signal transmitting device. The indoor positioning system for realizing the indoor positioning method is simpler in structure and lower in cost.

A magnetic core member, an antenna module, and a portable communication terminal having this, which have a configuration capable of satisfying enhancement of communication characteristics of antenna coils as well as their sufficient electromagnetic shielding function from a shield plate. A magnetic core member (4) is disposed between an antenna substrate having antenna coils (11), (12) formed therein and a conductive shield plate (3), and is formed by filling an insulating material (30) with a magnetic powder (31). The magnetic core member (4) has a two-layered structure including a first layer (4A) and a second layer (4B), thereby making a filling rate of the magnetic powder (31) in the first layer (4A) be lower than that of the magnetic powder (31) in the second layer (4B) so that a first surface (4a) on a side opposed to the antenna substrate (2) and a second surface (4b) on a side opposed to the shield plate (3) have magnetic properties different from each other.

The present invention relates to a distributed optical-fibre sensing detection method for cast-in-place pile foundation. It is characterized by that it utilizes the sensing property of optical fibre for strain, so that the optical fibre can be implanted in the cast-in-place pile. When the concrete is solidified or loaded externally, said concrete and its peripheral concrete can produce synchronous deformation, its produced strain extent is the strain valve of said pile-body concrete. The invented sensing technique is a distributed data acquisition, namely, it can obtain the strain data of every point of pile-body. Said invention can utilize these data to implement detection and analysis of cast-in-place pile.

The invention provides an intelligent control system for LED tunnel lamps and a method for controlling the LED tunnel lamps. The system comprises a control center PC computer, a tunnel lamp controllerand lamps, wherein a brightness / temperature / current sensor is connected with the controller via a transmission medium; the control center PC computer is connected with a plurality of drive control modules via the controller and a bus structure; and each drive control module is connected with a constant-current driving power supply of each LED tunnel lamp. Therefore, the system detects the intensity and weakness of light at the entrance and exit of a tunnel in real time via optical detectors distributed in the tunnel by applying highly accurate intelligent detection measure based on an advanced RISC microprocessor, and feeds processed data back to a control center; the control center processes the data and controls various tunnel lamps at different positions so as to control the brightnessof the LED tunnel lamps at different positions and finally achieve the aim of saving energy source.

The invention discloses an integrated protection system of a transformer substation based on IEC61850. The information about voltage, current and the like of the transformer substation marks GPS clock information by a combination unit; the switch state information of the transformer substation is collected by an intelligent operation box and marks the GPS clock information; and the information about voltage, current and switch state is sent to a protective main station system by Ethernet. The protective main station system judges whether the transformer substation has a failed electrical component according to the uploading information; a tripping operation order is sent to the intelligent operation box by Ethernet if a failure occurs; and the intelligent operation box trips off the corresponding breaker and is insulated from the failure. The protective main station comprises four host computers, wherein, two are used as the main protection for the transformer substation, and the other two are used as the standby protection for the transformer substation. Either host computer of the two used as the main protection can give a tripping operation order if detecting a failure. The two host computers for the standby protection are directly connected by special network, and can give a tripping operation order if detecting a failure at the same time, so that standby protection misoperation is avoided.

The present invention provides a frequency converter for driving a motor, comprising: a circuit board, having at least one first heat-generating element mounted thereon; a heat sink, connected to the at least one first heat-generating element; a fan, facing the heat sink; and a bracket, for positioning the at least one heat-generating element relative to the heat sink and the circuit board. The frequency converter further comprises: a separating member for separating the at least one portion of the main body of the at least one second heat-generating element from the circuit board, so as to prevent the cooling air guided to the at least one second heat-generating element from flowing to the circuit board; an airflow guiding member placed between the fan and the heat sink, for guiding the cooling air flowed from the fan to the heat sink and the at least one second heat-generating element respectively; and a flow guiding gate guiding the airflow from the fan to the heat sink, and dispensing more airflow to flow through the region corresponding to the at least one first heat-generating element.

A shielding structure for optical sub-assembly for transceivers includes a housing and a movable board. The housing has a bottom board, a front end board upward extending from a front end of the bottom board and two sideboards upward extending from a left side and a right side of the bottom board. The movable cover includes a plate main body. The plate main body has a connection end connected with the front end board of the housing and a press end opposite to the connection end. The movable cover further includes two sideboards downward extending from a left side and a right side of the plate main body. When installing the optical sub-assembly for transceivers into the shielding structure, the press end of the movable cover is pressed down until the movable cover is engaged with the housing in a closed state so as to avoid electromagnetic interference.

A radio-frequency connector consisting of a socket member and a plug member electrically connectable to the socket member is disclosed. The socket member or plug member has an impedance element mounted therein such that the impedance element is electrically connected to the metal casing and metal center pin of the socket member or plug member that carries the impedance element when the plug member is disconnected from the socket member, causing the impedance element to provide a terminal effect to insolate external electromagnetic noises; the impedance element is separated from the metal casing and metal center pin of the socket member or plug member that carries impedance element when the plug member is connected to the socket member.

A negative ion generator for improving the air quality of a room or space and may be conveniently incorporated into a lighting apparatus, appliance or other house item. The anion generator includes a metal fiber brush which reduces or eliminates ozone production. The lighting apparatus may take a variety of forms and may also include a photocatalyst coating to further purify the air.

A radio-frequency connector consisting of a socket member and a plug member electrically connectable to the socket member is disclosed. The socket member or plug member has an impedance element mounted therein such that the impedance element is electrically connected to the metal casing and metal center pin of the socket member or plug member that carries the impedance element when the plug member is disconnected from the socket member, causing the impedance element to provide a terminal effect to insolate external electromagnetic noises; the impedance element is separated from the metal casing and metal center pin of the socket member or plug member that carries impedance element when the plug member is connected to the socket member.

The invention relates to the field of an electric connector and especially relates to a full-shielding-type difference connector. The full-shielding-type difference connector comprises a housing and more than two difference modules. Each difference module comprises an insulator, differential pairs and grounding pins. The housing is provided with plugging holes corresponding to the differential pairs and the grounding pins; at least one side of the insulator is provided with a wiring shielding member; the wiring shielding member is arranged between any two difference modules; at least one side of the plug section of each differential pair is provided with an end shielding member; the end portion shielding member is arranged between the corresponding differential pairs of any two difference modules; the end portion shielding members are electrically connected with the corresponding wiring shielding members; the housing is provided with openings corresponding to the end portion shielding members; and the openings and the plug holes are mutually isolated. In the using process, the end portion shielding members block between the plug sections of the differential pairs of the two adjacent difference modules, so that electromagnetic interference between the plug sections of the differential pairs of the two difference modules can be prevented, and furthermore, the problem that an existing difference connector damages signal integrity of a transmission line is solved.

A USB connector includes an connector body holding first and second conducting terminals on top and bottom sides of a tongue plate of a first connection port thereof, a bottom positioning member located on the bottom side of the first connection port, an adapter board having first contacts located on the front side for the bonding of rear bonding portions of the first and second conducting terminals and first metal pads located on the rear side thereof for the bonding of the bonding portions of adapter terminals and electronic components electrically connected between the first contacts and the first metal pads, and a rear cover fastened to the rear side of the first connection port and the top side of the bottom positioning member to shield the first and second conducting terminals and the adapter terminals.

The invention discloses an electronic mutual inductor test system and a test method. The electronic mutual inductor test system comprises a standard device, a signal conversion device, an error measuring device, a test power supply, a merging unit and a tested electronic mutual inductor, wherein the standard device is used for providing a standard signal serving as a test reference; the signal conversion device is used for receiving the standard signal and converting the standard signal into an analog signal which can be acquired by the error measuring device; the test power supply is used for outputting a primary voltage and a primary current for test use; the merging unit is used for receiving a digital signal output by the tested electronic mutual inductor and processing the digital signal; and the error measuring device is used for receiving the standard signal output by the signal conversion device and the digital signal output by the merging unit, and acquiring the ratio difference and the phase difference of the tested electronic mutual inductor. The electronic mutual inductor test system is particularly suitable for a field error test of the electronic mutual inductor, andhas the advantages of convenient test work, high reliability, small equipment volume, light weight, high test result accuracy and the like.

The invention provides an FPGA (field programmable gate array) control-based all-solid-state high-voltage nanosecond pulse generator, and belongs to the field of bio-electromagnetic technology. The nanosecond pulse generator mainly comprises a power supply system, a pulse forming system, a pulse measurement system, an FPGA control system, a signal conversion system and a portable computer. In the generator, the output pulse amplitude is between 0 and 10kV, the pulse width is between 200 and 1000ns, the pulse frequency is between 1 and 1000Hz, the falling edge is between 30 and 40ns, the number of pulse is between 1 and 1000, and particular parameters are determined according the requirement of tumor treatment. The FPGA control-based all-solid-state high-voltage nanosecond pulse generator has the characteristics of intelligent regulation of pulse parameters (pulse amplitude, width, frequency and number), optical fiber transmission, high parameter accuracy, long service life, small size, low failure rate, good security and the like; and the generator outputs high pulse frequency, and is advantageous to quick searching of the optimal window parameters for inducing tumor cell apoptosis by virtue of intelligent regulation, so that the tumor treatment effect is improved. The FPGA control-based all-solid-state high-voltage nanosecond pulse generator can be widely applied to tumor treatment.

The invention relates to a system and a method in which an electrophysiological signal is sensed capacitively with at least two closely spaced electrodes such that the electrodes experience strongly correlated skin-electrode distance variations. To be able to derive a motion artifact signal, the capacitive coupling between the electrodes and skin is made intentionally different. With a signal processing means the motion artifact signal can be removed from the measured signal to leave only the desired electrophysiological signal. Since the measured quantity is dependant on the electrode-skin distance itself, the system and method do not need to rely on the constancy of a transfer function. Hereby, they give reliable motion artifact free output signals.

The invention provides an ultra-wideband antenna. The ultra-wideband antenna comprises a dielectric substrate, wherein a radiation unit, a feeding structure and a ground plane are printed on the dielectric substrate; the radiation unit is a forked chip; the feeding structure is a coplanar waveguide feeding structure; and the ground plane is a coplanar waveguide ground plane. The ultra-wideband antenna has a coplanar waveguide structure, so that a single planar printed antenna structure can be realized; the ultra-wideband antenna can be easily integrated with a microwave integrated circuit; the coplanar waveguide ground plane can serve as the ground plane of the whole antenna, and particularly for the coplanar waveguide structure with a wideband slot structure, wideband work can be realized, and the electromagnetic interference of outside on the antenna can be effectively avoided; and wideband impedance bandwidth can be easily realized, and the efficiency of the antenna is improved, so that higher antenna gain can be achieved.

An electrical connector has an insulative housing, a plurality of first terminals, a plurality of second terminals and a terminal shield. The first and second terminals are mounted in the insulative housing and each terminal has a soldering segment. The terminal shield substantially shields the soldering segments of the second terminals and prevents electromagnetic interference so that transmitting high frequency signals on the second terminals is stable.

The invention relates to an automatic measurement range switching device of an electronic current transformer, which comprises a current sensor, a single-pole two-throw electronic changeover switch, an A / D converter and a microprocessor. The two outputs with different transformation ratios of the current sensor are both connected with one input end of the electronic changeover switch, the output of the electronic changeover switch is converted to digital quantity through the A / D converter and then read-in by the input end of the microprocessor, and the measurement range control output end of the microprocessor is connected with the changeover control end of the electronic changeover switch. The automatic measurement range switching device provided by the invention can conduct automatic switchover according to the signal variation amplitude; and in case of low current, the A / D converter adopts large measurement input to increase signal-to-noise ratio, and in case of heavy current, the switch is switched to protecting signal input to ensure large A / D input range. Through the use of the automatic measurement range switching device, the electronic current transformer can use the same A / D channel to realize high precision and large-range measurement at the same time, so as to enhance the antijamming capability of small signals.

The invention discloses an electric pulse rock-breaking dill bit and an experimental facility thereof. The electric pulse rock-breaking experimental facility comprises a confining pressure pumping station, a pulsed power supply, a PLC control device, a confining pressure cylinder horizontal-moving device, a water inlet and outlet pump, a confining pressure cylinder assembly, a high-pressure electric pulse rock-breaking drill bit body, and the like. The high-voltage pulsed power supply is used for transmitting high-voltage pulse electricity from a high voltage electrode to a low voltage electrode through a cable, the high-voltage pulse electricity meeting certain conditions breaks through rocks firstly to generate a discharge channel, a plasma channel expands when heated, when the pressureexceeds the stress intensity of the rocks, and the rocks are broken and the high-voltage pulse discharge drilling is realized. The high-pressure electric pulse rock-breaking experimental facility cansimulate the high voltage environment of deep drilling in the earth, electric pulse drilling experiments carried out on high temperature and high pressure deep wells and ultra-deep wells are more close to actual drilling environments, experimental studies on the geometrical shape, distribution, spacing and electrode materials of electrodes of high-voltage electric pulse rock-breaking drill bit inthe deep wells and the ultra-deep wells can be realized, and the high-voltage pulse discharge drilling has broad development prospects.

Disclosed is a display apparatus including a front cover, a rear cover coupled the front cover and forming an accommodating space, a display panel disposed inside the accommodating space, a main PCB having a signal processor and transmitting a video signal to the display panel, and a PCB supporting member supporting the main PCB. The display apparatus includes a TV tuner unit having a TV tuner receiving the TV video signal, a casing accommodating the TV tuner, and a connector electrically connected with the TV tuner, a tuner unit accommodating part accommodating the TV tuner unit, and a connection port provided at the tuner unit accommodating part for transmitting the TV video signal from the TV tuner unit to the signal processor.

The invention discloses a phase noise measurement method based on radio frequency cancellation. The method comprises the following steps: dividing reference microwave signals at the same frequency as to-be-measured microwave signals into two channels; using one channel of reference microwave signals to cancel the to-be-measured microwave signals so as to convert carrier phase modulation by phase noise into suppression of carrier amplitude modulation; then, performing coherent demodulation on the canceled signals and the other channel of reference microwave signals; and finally, making a spectrum analysis of the low-frequency component of the signals after coherent demodulation to get the phase noise of the to-be-measured microwave signals. The invention further discloses a phase noise measurement device based on radio frequency cancellation. Compared with the prior art, the measurement sensitivity is higher, and the calibration process is easier.

The invention provides a double-network digital mobile communication terminal and a double-network communication method thereof. The communication terminal comprises a private network communication unit, which is used for private network signal communication; a public network communication unit, which is used for public network signal communication; and a central control processing module, which is respectively coupled with the private network communication unit and the public network communication unit to control the private network communication unit and the public network communication unit.