529results about How to "Reduce electromagnetic interference" patented technology

The invention discloses a high efficiency incandescent and Compact Fluorescent (CFL) bulb replacement LED lamp having a good color reproduction. The LED light bulb includes two groups of semiconductor light emitters and a luminescent material to emit four different spectrums of light. The two groups of semiconductor light emitters are enclosed around an interior wall of the light bulb housing, which has a plurality of fins at an exterior surface for effective heat dissipation. A high reflective member having a dome shape in the center is disposed under the two groups of semiconductor light emitters to redirect the emission and excitation lights from the two groups of semiconductor light emitters and recycle the backscattered light for multi-spectrum light mixing. The LED-light bulb further includes a single power line connecting to the two groups of semiconductor light emitters and a high efficiency electrical AC/DC conversion and control device. The light bulb has a diffuser dome for an output window and a conventional Edison-mount screw-type light bulb socket, a conventional fluorescent tube coupler arrangement or a conventional halogen MR-16 socket arrangement connecting to an AC power base. If a voltage is supplied to the AC/DC conversion and control device, a mixture light from the diffuser dome produces a warm white light with a color rendering index of at least 85 and a luminous efficacy of at least 80 lumens per watt.

The invention discloses a microminiature personal combined navigation system as well as a navigating and positioning method thereof. The system is composed of a subsystem installed on the foot part of a human body and a subsystem installed on the trunk position, wherein the subsystem installed on the foot part comprises an MEMS IMU (Micro-electromechanical Systems Inertial Measurement Unit), a magnetometer and a communication module; and the subsystem installed on the trunk position comprises a satellite navigation receiver, a Doppler velometer, an atmospheric pressure altimeter, a communication module and a microminiature navigation computer. The positioning method comprises the following steps of: collecting the MEMS IMU signal; modeling and correcting the random error of a gyroscope and an accelerometer; initially aligning an MEMS inertial navigation system; resolving strapdown inertial navigation, and correcting zero speed; carrying out combined navigation of the MEMS inertial navigation system/ satellite navigation receiver/ the Doppler velometer/ the magnetometer/ and the atmospheric pressure altimeter; and displaying the navigation result in real time. The microminiature individual combined navigation system is convenient to individually carry, individual real-time gesture fixing, velocity measurement and positioning can be realized, and whole and precise real-time navigation positioning information can be provided for pedestrians, operating personnel, soldiers, rescue workers and the like in the complex electromagnetic environment.

A method and system for facilitating focusing of a miniature camera are disclosed. One or more lenses can be attached to a MEMS stage. The MEMS stage can be moved by a Lorentz actuator. The MEMS stage can be configured to limit movement of the lens(es) to a single degree of freedom to inhibit misalignment thereof with respect to an imaging sensor. The stage can be biased to a predefined position thereof, e.g., for focus at infinity. A metal cover can inhibit electromagnetic interference and can limit movement of the lens(es).

The invention discloses an electric field coupling-based wireless power transmission system. The system comprises a power supply circuit, a high-frequency inverter circuit, a tuning circuit, an electric field coupling polar plate, a rectifier filter circuit and a load circuit and is characterized by also comprising a coupling capacitance detection module, a controller and a fixed frequency drive circuit; a capacitance compensation array is arranged in the tuning circuit; the controller detects parameters of the electric field coupling polar plate and controls compensation values of the capacitance compensation array through the coupling capacitance detection module, and outputs fixed frequency control signals; and the fixed frequency signals are transmitted to the fixed frequency drive circuit, and then the high-frequency inverter circuit is driven to work. The electric field coupling-based wireless power transmission system has the advantages that based on the electric field coupling, the transmission capacity and efficiency of the system are improved by adopting an E amplifier; and by arranging the coupling capacitance detection module, the electric field coupling polar plate of the system is detected in real time, and the capacitance compensation value can be effectively controlled, so that the system is kept in the soft switching state, and the power transmission stability and reliability of the system are improved.

There is provided a display driver device (liquid crystal driver) causing no degradation in display image quality even when a plurality of signal lines (source lines) of a display panel are divided into a plurality of groups as a countermeasure against EMI. With a liquid crystal display driver device (the liquid crystal driver) for generating image signals to be impressed to respective signal lines of a display panel upon receiving display image data, and outputting the image signals in a lump, corresponding to every one line, according to an output timing signal inputted from outside, output amplifiers, in the last stage of the liquid crystal driver, for outputting the image signals, respectively, are divided into a plurality of groups, and the output amplifiers of respective groups are caused to undergo a periodical change in output sequence while the respective image signals are slightly staggered in output timing by the group.

A radio frequency antenna system and high-speed digital data link are disclosed to, among other things, reduce electromagnetic interference (“EMI”) at relatively high data rates while reducing the manufacturing complexities associated with conventional data links. In one embodiment, a radio frequency (“RF”) antenna system includes an antenna and an RF radio coupled to the antenna for receiving wireless RF signals. In particular, the RF radio is configured to digitize RF signals at a fixed data rate to form digitized data signals and to apply the digitized data signals at a variable data rate to a high-speed digital link. The variable data rate distributes the signal energy of the digitized data signals over one or more bands of frequencies, thereby beneficially altering an EMI spectral profile describing emissions that develop as the digitized data signals are transported through a channel.

System and method for providing frequency control to a power converter. The system includes a pseudorandom signal generator configured to generate a digital signal. The digital signal is associated with at least an N-bit datum, and N is a positive integer. Additionally, the system includes a digital-to-analog converter configured to receive the digital signal and generate a first control signal, an output signal generator configured to receive the first control signal and generate at least a first output signal associated with a frequency, and a pulse-width-modulation generator configured to receive at least the first output signal. The N-bit datum represents a pseudorandom number.

An apparatus and method for altering the electromagnetic environment of ophthalmic tissues, cells, and molecules comprising, establishing baseline thermal fluctuations in voltage and electrical impedance at a target pathway structure depending on a state of at least one of the ophthalmic tissue components, configuring at least one waveform to have sufficient signal to noise ratio to modulate at least one of ion and ligand interactions whereby the at least one of ion and ligand interactions are detectable in the target pathway structure above the established baseline thermal fluctuations in voltage and electrical impedance, generating an electromagnetic signal from the configured at least one waveform, and coupling the electromagnetic signal to the target pathway structure using a coupling device whereby enhancing the release of second messengers, such as NO, growth factors and cytokines at the target pathway structure. The use of the within specified electromagnetic waveforms can have particular utility in the prophylactic treatment of ophthalmic tissue and the treatment of ophthalmic diseases such as macular degeneration, glaucoma, retinosa pigmentosa, repair and regeneration of optic nerve prophylaxis and other related diseases that respond positively to the physiological effects of these waveforms.

The present invention relates to a microwave absorbing composition comprising:

• • a) magnetic nanoparticles, dispersed in
  • b) a polymer matrix comprising at least one highly branched polymer comprising nitrogen atoms,

a method for the production of such a microwave absorbing composition and the use thereof.

A capacitance touch-sensitive screen comprises an upper substrate, a lower substrate and an inductive module, which is characterized in that a clearance between the upper substrate and the lower substrate is filled with insulating liquid to control distance between these two substrates, thus eliminating uneven distance between these two substrates, avoiding ineffective touch-sensitive screens and prolonging service life of the touch-sensitive screen. As for production method of the capacitance touch-sensitive screen, it is necessary to firstly produce a row inductive module on the upper substrate and a column inductive module on the lower substrate and then glue two substrates with glues through side frames and reserve an opening. The opening is filled with insulating liquid through vacuumizing and liquid filling and finally sealed with sealing compounds.

The configurations of a parallel-connected UPS circuit are provided in the present invention. The proposed circuit includes a neutral, a battery having a positive and a negative terminals, and a plurality of PFC boost converters, each of which includes a PFC circuit including an inductor having a first terminal coupled to the positive terminal and a second terminal, a rectifying bridge coupled to the second terminal of the inductor, and having a first terminal and a second terminal coupled to the negative terminal, a switch bridge having a first terminal coupled to the first terminal of the rectifying bridge and a second terminal coupled to the second terminal of the rectifying bridge, and a control switch having a first terminal and a second terminal coupled to the neutral.

The invention discloses an isolated high-power factor flyback type primary-side constant-current control device of an LED driver. The output end of a peak value sampling and keeping module in the primary-side constant-current control device is connected with the input end of an auxiliary-side current simulating module, the output end of the auxiliary-side current simulating module is connected with one input end of an average current ring, the other input end of the average current ring is connected with a half-sinusoid reference module, the output end of the average current ring is connectedwith one input end of a multiplication module, the other input end of the multiplication module is connected with a half-sinusoid generating module, the output end of the multiplication module is connected with one input end of a comparison module, the output end of the comparison module is connected with one input end of a driving pulse generating module, an inductive current zero-passage detecting module is connected with the other input end of the driving pulse generating module, and the output end of the driving pulse generating module is connected with a driving module. The primary-side constant-current control device can realize high-power factor control and output constant-current control without an optical coupling circuit and an auxiliary-side feedback circuit.

The invention provides a generating device for an atmospheric bare electrode cold plasma jet. The generating device comprises a working gas source, a pressure reducing valve, an adjustable flow meter, a high-voltage power supply, a cylindrical shell, a nozzle electrode and a pin electrode, wherein the tail part of the cylindrical shell made of insulating material is connected with a gas supply system; the front end of the cylindrical shell is connected with the nozzle electrode through a thread; the pin electrode is fixedly arranged in a central hole of the cylindrical shell; a certain discharging clearance is kept between the tip of the pin electrode and the nozzle electrode; a plurality of through holes parallel to the central hole of the cylindrical shell are distributed around the central hole; the through holes are used for conveying the working gas to a discharging area in the nozzle electrode; a high-voltage output end of the high-voltage power supply is connected with the pin electrode; and a low-voltage output end of the high-voltage power supply is connected with the nozzle electrode and is grounded. Cold plasma is generated at the tip of the pin electrode by adjusting the high-voltage power supply and the flow of the working gas, and the cold plasma is jetted from an outlet of the nozzle electrode so as to form the cold plasma jet. According to the generating device provided by the invention, uniform and stable cold plasma jet can be obtained under an atmospheric open air environment.

A liquid crystal display (LCD) device having an LCD panel with a plurality of pixels is disclosed. The LCD device includes gate and data driving circuits to provide a gate pulse and a data voltage to the pixels, respectively, and a timing controller to control the gate and data driving circuits. The LCD device also includes a backlight unit to provide light to the liquid crystal panel. The backlight unit includes a light source having at least one LED channel, a driving voltage generator to supply a driving voltage to the LED channel, and an LED driver to supply a conditional pulse width and amplitude modulation (CPWAM) signal to the LED channel. The CPWAM signal has a pulse with an amplitude and a width that are both variable from one period of a predetermined length to another period of the predetermined length.

The embodiment of the invention discloses a composite magnetic core structure and a magnetic element, which are used for reducing magnetic core loss and increasing the frequency of application. In the embodiment of the invention, the composite magnetic core structure consists of a first magnetic core part and a second magnetic core part, the first magnetic core part is made of low-magnetic permeability soft magnetic material, the second magnetic core part is made of high-magnetic permeability soft magnetic material, and the first magnetic core part and the second magnetic core part are combined and formed into a magnetic flux loop.

Disclosed is a high-efficiency phase shift modulation method suitable for use in a traditional DC/AC single-phase full-bridge inverter. In this method, phase-shifted signal timing is used to modulate a duty cycle so that a power transistor is operated in a zero voltage switching state. As such, noises and switching loss of a switching device when turned on or off, may be reduced and thus efficiency of the inverter may be promoted. With this high-efficiency phase shift modulation method, at least the following advantages may be achieved: lower switching stresses, lower switching losses and thus increased conversion efficiency, lower electromagnetic interferences (EMIs) and no additional circuit required and thus easier realization of a controller for the inverter.

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.

For a phase-locked loop, disclosed is a method (and corresponding apparatus) for reducing electromagnetic interference caused by a clock signal produced by a voltage controlled oscillator, the method comprising: generating a control signal having a first type, e.g., sinusoidal, of slight variation in magnitude relative to a nominal magnitude value thereof; and providing the slightly varying control signal to a voltage-controlled oscillator (“VCO”) to obtain a clock signal exhibiting a second type, e.g., sinusoidal, of slight variation in frequency relative to a nominal frequency value thereof. The slight variation is non-negligible.

A chemical and biological transducer is prepared by setting two long period fibre gratings, fibre covering and fibre core on one piece of fibre to form a MZ interferometer and then plating a metal film on fibre covering surface to form SPR transducer of fibre MZ interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer formed as above, fibre spectrograph and computer as said transducer is set in gas or solution of chemical composition or biological molecule to be tested.

A shielding assembly includes a cage (40), a shielding plate (10), and a gasket (50). The cage includes a front end portion (41), a rear end portion (43) opposite to the front end portion, a plurality of clips (45) protruding from the front end portion, a pair of sidewalls (44), and a back wall (46). The shielding plate attached to the front end portion of the cage, includes a main portion (12), a plurality of resilient tabs (14) projecting from an inner surface of the main portion, and a plurality of through hatches (16) in the main portion for receiving the clips. The gasket is attached to the rear end portion and abuts against outer surfaces (49) of the sidewalls and the back wall.

A transceiver module for optical communications is provided in which the leadframe assembly includes at least first and second die attach regions to which the laser diode driver IC and the laser diode IC are secured, respectively. A slot formed in the leadframe between the first and second die attach regions provides an air gap that at least partially thermally isolates the laser diode IC from the laser diode driver IC. This air gap results prevents heat generated by the laser diode driver IC from appreciably affecting the temperature of the laser diode IC, and thus from detrimentally affecting the performance of the laser diode IC. This slot also allows contact pads of the laser diode IC to be directly connected by leads to contact pads of the laser diode driver IC, which reduces the lengths of the leads and thus their inductances, which prevents EMI problems from occurring.

A receptacle connector comprises an inner housing, multiple first pins, multiple second pins, an outer housing, an inner casing and an outer casing. The first pins and the second pins are mounted through the inner housing. The outer housing is mounted around the inner casing. The outer casing is a folded sheet of metal and is mounted around the outer housing.

The invention discloses a high-frequency transformer. The high-frequency transformer comprises a magnetic core and windings, wherein the magnetic core and the windings are arranged on a skeleton; and two shielding layers are arranged on the windings. The invention further discloses an electronic magnetic interference (EMI) suppression circuit including the high-frequency transformer. The EMI suppression circuit comprises a common-mode capacitor, an alternating current (AC) input, a common-mode inductor, a rectifier filter, an LLC converter, a high-frequency transformer and a rectified output, wherein one end of the common-mode capacitor is connected to a zero end of the common-mode inductor; and the other end of the common-mode capacitor is connected to a negative port of the rectified output. The two shielding layers are arranged on the high-frequency transformer, so that the electronic magnetic interference of the high-frequency transformer is suppressed to the minimum. According to the EMI suppression circuit including the high-frequency transformer, the problem of electronic magnetic interference is efficiently solved; the high-frequency common-mode interference current shock is relatively well suppressed; the size and the weight are reduced; and the cost is reduced.

The converter includes six pieces of three phase bridge arm including full controlled main switch with diode connected in inverted parallel, input inductance connected between power source and middle point of each phase bridge arm, and output capacitance connected to output end of three phase bridge arm. Characters are that capacitance is connected to six main switches respectively. Resonant inductance is connected to DC bus of three-phase bridge arm and output capacitance. Cascaded circuit of auxiliary switch and clamping capacitance is cross-connected on two ends of resonant inductance. Two ends of the auxiliary switch are connected to diode in inverted parallel as well as connected to capacitance. Features of the converter are simple structure, restraining backward recovery of diode connected in inverted parallel, realization of soft switch and high efficiency of circuit.

The present invention provides a shield and a connector with the shield. The shield includes a top surface, a bottom surface and two lateral surfaces to receive the connector. A plurality of first cantilever elastic slices is formed at the top and lateral surfaces of the shield. A second cantilever elastic slice is formed at the top surface of the shield. The second cantilever elastic slice is longitudinally incised to form two slots. A simple supporting beam is formed between the two slots. The simple supporting beam projects and props a mated connector. The received connector further includes a plastic casing. The plastic casing inserts into the shield and receives a plurality of contacts. So that the reliable and steady insertion function between the shield and the connector is obtained, the integral and continuous shielding function of the shield is achieved too.

An electrical receptacle connector includes a metallic shell, an insulated housing received in the metallic shell, receptacle terminals, and a grounding plate. The receptacle terminals and the grounding plate are at the insulated housing. The insulated housing includes a base portion and a tongue portion extending from the base portion. The grounding plate includes a plate body, extension arms, and contact regions. The front of the plate body is near to a front lateral surface of the tongue portion, and the rear of the plate body is extending to the base portion. The plate body is between the receptacle terminals. The extension arms are extending from the plate body. The contact regions are formed on the extension arms and in contact with an inner wall of the shell body. Accordingly, the grounding plate is in contact with the metallic shell for providing grounding and reducing the electromagnetic interference.

An integrated touch panel structure and manufacturing method thereof are described. The integrated touch panel structure is integrated by a first sensing layer, a displaying layer, a backlight plate and a composite component layer. The composite component layer includes a second sensing layer and a processing circuit layer. The processing circuit layer further includes a metal area for preventing a touch signal from electromagnetic interference to increase the precision of the touch signal.

A stacked modular jack (100) mounted on a mother printed circuit board includes an insulative casing (3), a magnetic subassembly (2) disposed within the casing and an outer shield (1) enclosing the casing. The magnetic subassembly includes a single molded housing (21) having a receptacle (212) forwardly extending from a main body (211) thereof. A plurality of barriers (218) are formed in a bottom surface of the receptacle for retaining magnetic coils and transformers. The magnetic subassembly further includes an optional magnetic box liner (25) defining a plurality of channels (255) for cooperating with corresponding barriers of the housing for shielding the coils and transformers from other inside components of the modular jack, thereby effectively reducing electromagnetic interference.

A system for reducing electromagnetic interference between two or more co-located antennas is described herein. In one embodiment, the system includes a first antenna for transmitting a first signal within a first frequency band, and a second antenna for operating within a second frequency band during transmission of the first signal. The first and second frequency bands may be substantially identical, or may occupy overlapping or nearby channels within the radio frequency spectrum. The system also includes an apparatus. In one embodiment, the apparatus is positioned proximate to the second antenna for intercepting the electromagnetic energy radiated from the first antenna during transmission of the first signal. In other embodiments, the apparatus may be positioned proximate to the first antenna for intercepting the electromagnetic energy radiated from the second antenna during transmission of a second signal. In either embodiment, the apparatus is able to reduce electromagnetic interference between the first and second antennas by scattering (or redirecting) radiated energy away from either the first antenna or the second antenna.

The invention provides a pre-charging and fault protection integrated device of a frequency converter, and relates to the technical field of frequency converters. A pre-charging circuit and a fault protection circuit are integrated to realize pre-charging and fault protection functions of the frequency converter. After that a system has a fault, a contactor of a main loop is disconnected; and after that the fault is removed, the system is re-electrified, the pre-charging function is recovered rapidly, and a normal work state is recovered. The pre-charging circuit and the fault protection circuit of the frequency converter are considered in a unified manner, a protective measure is added to a protection method of carrying out fault blocking and wave generation on the switch tube of the inverter, and the device is safer and more reliable; the pre-charging and fault protection circuits are separated from the control unit, and electromagnetic interference of strong power signals on weak control signals is reduced; and a charging resistor is controlled by both a power electric switch and a charging threshold signal, a supporting capacitor is prevented from repeated charging and discharging, and the service life of the charging resistor is ensured.