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

High efficiency incandescent bulb replacement lamp

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.
Owner:LEDNOVATION

Microminiature personal combined navigation system as well as navigating and positioning method thereof

InactiveCN102445200AReduce electromagnetic interferenceSuitable for personal portabilityNavigation instrumentsAccelerometerGyroscope
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.
Owner:NANJING UNIV OF SCI & TECH

Electric field coupling-based wireless power transmission system

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.
Owner:重庆华创智能科技研究院有限公司

Electromagnetic apparatus for prophylaxis and repair of ophthalmic tissue and method for using same

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.
Owner:RIO GRANDE NEUROSCI

Isolated high-power factor flyback type primary-side constant-current control device of LED driver

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.
Owner:ZHUHAI HUASAI ELECTRONICS TECH CO LTD

Generating device for atmospheric bare electrode cold plasma jet

InactiveCN102625557ASimple structureLow jet temperaturePlasma techniquePlasma jetJet flow
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.
Owner:DALIAN UNIV OF TECH

High-frequency transformer and electronic magnetic interference (EMI) suppression circuit including same

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.
Owner:JIANGSU KEGU ELECTRONICS CO LTD

Pre-charging and fault protection integrated device of frequency converter

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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
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