1425results about How to "Improve electromagnetic compatibility" patented technology

A multi-band antenna includes a resonance frequency regulator, a ground device, a short-circuiting device and a feed-in line. The resonance frequency regulator provides a first resonance mode and a second resonance mode respectively corresponding to the first band and the second band. The ground device includes a main ground surface, a first ground regulator, and a second ground regulator. The main ground surface includes a first ground point corresponding to the first resonance mode, and a second ground point corresponding to the second resonance mode. The short-circuiting device has one end connected to the resonance frequency regulator, and the other end connected to the second ground point. The short-circuiting device has a feed-in point connected to the feed-in line for transmitting electromagnetic signals and the feed-in line connects with the first ground point.

A Wireless power transmission system comprises a base unit (1) with multiple magnetic field generator circuits and a device (10), separable from said base unit (1) having a receiving inductor, adapted to receive power inductively when said device (10) is in proximity to one of said generator circuits, wherein said base unit (1) comprises a controller (3), configured to determine a transmission circuit (2′) from said generator circuits when said receiving inductor is in proximity to said transmission circuit (2′), whereupon said transmission circuit (2′) is operated to generate a first magnetic field (8), having a first phase, to induce a current in said receiving inductor and at least one of the remaining generator circuits is operated as a compensation circuit (2″, 52, 82) to generate a second magnetic field (21), having an opposite phase to said first phase.

The robustness of hearing aid devices in terms of electromagnetic disturbances and chemically aggressive surroundings should be improved. For this purpose, provision is made to equip a hearing aid apparatus with optical microphones. Since no metal parts must be used for these optical micro-phones, corrosion can be largely excluded. Furthermore, no EMC problems occur as a result of the optical signal processing.

In a flat-type blower unit disposed in a narrow space between a bottom portion of a front seat and a vehicle floor in a vertical direction, a motor-attachment bracket part for attaching a fan motor is integrally formed with a drive circuit cover part for covering a motor drive circuit to construct a motor attachment bracket having heat-generating components which generate heat when being operated. The motor attachment bracket is disposed to protrude radial outside from the fan motor, so that a dimension of the motor attachment bracket in the vertical direction can be reduced.

The invention discloses a method and device for measuring the mixing electric vehicle running ability parameter. The method uses the controller to do real-time collecting during the running course of the mixing electric vehicle, stores the relative parameters of the running course by the storage medium, and uses MATLAB software to impact the collected parameter into each capacity corresponding curve and then uses the curve to overall merit the vehicle capacity index. The device comprises an embedded CAN controller, an A / D transfer module, an I / O module CPU, a serial port communicating module, a LIN bus module, a RTC real-time clock module, a USB module and a CPLD module.

A method and apparatus for supporting a patient on a mattress. The apparatus includes a mattress which has at least one controlled release chamber with a top face and a bottom face. A flexible film of a thin metal foil is linked to the top face, while at least one impedance varying device is linked to the bottom face of the chamber. The impedance varying device is an integral part of a measuring electronic bridge. Changes in the impedance as a result of movement of the top face with respect to the bottom face activates a servo control which increases or decreases the inflation pressure within the chamber to make certain that the distance between the top face and the bottom face of the chamber is maintained at a predetermined distance. The method of this invention includes the steps of providing a mattress having at least one closed or controlled release chamber having a top face and a bottom face, providing a measurement device which includes a flexible film of a thin metal foil linked to the top face of the chamber and cooperating with at least one impedance varying element linked to the bottom face of the chamber, the impedance varying element being integral with a measuring electronic bridge, and measuring spacing between the top face and the bottom face to provide control of the supporting action of the mattress as a function of the patient's morphology and position on the mattress.

A DC / AC converter is disclosed having two DC voltage connections (1,2), between which are provided in a parallel circuit configuration, an intermediate energy storage (C1) and a bridge circuit providing at least two parallel branches, each branch providing two in-series-connected switch units (A,B and C,D), to each of which a rectifier diode (DA,DB,DC DD) is connected in parallel, and having at least two AC connections, of which each single AC connection is connected via a connecting line, in each of which an inductor (L1 respectively L2) is provided, to one of the parallel branches of the bridge circuit between two the switch units (A,B respectively C,D) via one connecting node. In at least two connecting lines, two separate electrical connecting paths are provided, in each of which a switch (E respectively F) and an in-series-switched rectifier diode (DE respectively DF) are provided. The rectifier diodes (DE,DF) in the single connecting paths are switched in an opposite conducting direction.

The invention discloses a symmetrical half-bridge LLC resonant bidirectional DC-DC converter, which belongs to the technical field of power electronic application. Topological structures on the two sides of the converter are symmetrical, and adopted components adopt a complex function design. When a switching network and a resonant network on one side of a high frequency transformer function, the switching network and the resonant network on the other side are automatically evolved into a rectifier-load network, and the networks on the two sides commonly form the whole LLC resonant converter to realize power conversion in a corresponding direction. Because the structures are completely symmetrical, reverse conversion can be possible; and in the reverse conversion, the topological structures can be automatically reconstructed to form a reverse LLC resonant converter to realize reverse power conversion. The symmetrical half-bridge LLC resonant bidirectional DC-DC converter achieves effective improvements in conversion efficiency, power density, dynamic performance and electromagnetic compatibility, reduces the electrical stress of components at work, has a reduced volume and a reduced weight, and realizes highly-efficient, isolated and bidirectional DC / DC power conversion.

A power supply circuit has an LLC converter stage for converting a DC voltage input into a DC voltage output, and at least one hysteretic converter stage. Each hysteretic converter stage has a DC voltage input coupled to the DC voltage output of the LLC converter stage, and a DC current output. The LLC converter stage lacks a feedback control, and is operated at its load independent point. A ripple on the DC voltage output of the LLC converter does not affect the output current of the hysteretic converter stage. The stable DC current output of the hysteretic converter stage is coupled to a load having one or more LED strings.

The invention relates to an in-situ high-frequency fatigue material mechanical test platform under a scanning electron microscope based on a stretching / compressing mode and belongs to the field of machinery and electronics. The test platform comprises a precise loading unit, a precise motion conversion unit, a load / displacement signal acquisition and control unit, a high-frequency driving unit and a test piece clamping and connecting unit. The test platform provided by the invention has the advantages that the structure is compact, the test precision is high, the strain rate and the test frequency are controllable, an in-situ high-frequency test based on the stretching / compressing mode can be performed on a three-dimensional test piece aiming at centimeter-scale or above in characteristicdimension under the condition of observation of various imaging instruments, the on-line monitoring can be carried out on the microcosmic deformation, damage and breaking process of a material under a fatigue stress, and a novel test method for revealing microcosmic deformation behaviors and a damage system of the material is provided.

The invention relates to the technical field of human body fall-down detecting and intervening and provides a human body fall-down prevention early warning and intervening method and system. The human body fall-down prevention early warning and intervening method includes the steps that real-time detection is performed on the body posture of a monitored object, body posture information of the monitored object is collected, and detection data are obtained; fusion processing is performed on the detection data so as to obtain the processed signal data; the processed signal data are compared with a set threshold so as to judge whether the monitored object inclines to fall down or not, and when the monitored object inclines to fall down, early warning information is sent out before the monitored object falls down; fall-down prevention shoes work, intervening measures are carried out, and fall-down prevention is performed. The human body fall-down prevention early warning and intervening method and system achieve early warning and intervening before the human body falls down.

The invention relates to a comprehensive automation integrated protecting method and a system which adopt an integrated IED to carry out automation functions such as protection, measurement and control, computation and the like of all bay units in a substation; state quantity, analog quantity and digital quantity which are output in interval by primary equipment on a process layer of the substation are respectively uploaded to the integrated IED through an ethernet switcher by a dual Ethernet (100mega / 1000mega), and the protection and automation function of the substation are realized by calculating and processing the state quantity, analog quantity and digital quantity which are output in interval respectively by the integrated IED, therefore, a spacing layer and a substation layer of the substation are unified into one layer according to IEC61850 standard, and a plurality of IEDs are integrated into one integrated protecting IED, and two same integrated IEDs are provided for hot spare for improving the reliability. The comprehensive automation integrated protecting system leads the substation integrated protecting functions to share a uniform information platform, and communication network is used for replacing control cables, thus improving the reliability of the signal transmission, further improving automation and management level and reducing comprehensive construction cost.

An electrical distribution box for vehicles with two networks at different voltage levels, comprising centralized electronic signal and power control means, including a microprocessor and electrical protection means, arranged on printed circuit boards in a casing, electrically connected to at least one DC supply source and to parts of the vehicle, incorporating at least one voltage converter (5) inside the distribution box (1), on an independent printed circuit board (10) or in a differentiated area of a supporting plate of the control means, which board (10) or differentiated area is in a clear area of said casing, both in its upper part and in its lower part, electromagnetic screening means having been provided for the converter (5) inside the casing, and thermal dissipation means for the supporting plate of the converter (5).

The invention relates to a topological structure of a multi-level photovoltaic power generation system and a control method of the topological structure. The topological structure comprises M photovoltaic arrays, the boost DC / DC (direct current / direct current) converters of the M photovoltaic arrays, 3n isolation flyback DC / DC converters and 3n H-bridge voltage source inverters. The PWM (pulse-width modulation) control signals of the first to nth H-bridge voltage source inverters of the three phases A, B and C of the cascade H-bridge multi-level voltage source inverters are obtained through an active power calculation method of a super-capacitor direct-current bus voltage controller and a photovoltaic array, and current tracking control of a dq synchronous coordinate system; the PWM control signals of the electronic power switches S2 of the wth and kth isolation flyback DC / DC converters are obtained through a control method of the isolation flyback DC / DC converters; the PWM control signals of the electronic power switches S1 of the j boost DC / DC converters are obtained through a control method of the boost DC / DC converters. The topological structure has the benefits that the shortcomings of large volume and high cost of power-frequency boosting transformers used when existing large-scale photovoltaic power generation systems are connected to a power grid are overcome.

The invention concerns generally the technological field of antenna arrangements in mobile stations. The invention also concerns a mobile station equipped with such an antenna arrangement. One idea of the present invention is providing a planar antenna in which the printed wired board (PWB) of the mobile station is used. The planar antenna has preferably an air gap between the radiator element (216) and the ground plate (218). In order to reduce the effects of the RF fields to other phone electronics there is a sheet of low reluctance material (245) for reducing the RF fields. The sheet of low reluctance material is so located that it covers an area of the printed wired board which is not covered by the radiator element or the ground plane of the planar antenna. The low reluctance material is preferably ferrite material, such as flexible ferrite sheet, and it may be attached to the display unit (208a, 208b) or on the PWB (234).

The invention relates to an in-situ digitization method and a device of primary equipment of a substation; the in-situ digitalizer is arranged in each gap of the primary equipment on a spacing layer of the substation; the in-situ digitalizer respectively collects the status quantity such as a switch and a disconnecting link and the like in the same gap to convert into GOOSE format message, and respectively collects mutual inductor digital quantity and analog quantity information in the same gap to convert into sampling value transport format message, and the information processed by the in-situ digitization is sent out to a local area network in a process layer of the substation; the local area network in the process layer receives the GOOSE format message for converting into the open-closed operation control of the switch and the disconnecting link. The in-situ digitization method and the device thereof of the substation share the information in a uniform information platform, and the communication network is used for replacing control cables, thus being convenient for the design, construction, extension-construction of the substation, improving the reliability, further improving automation and management level and reducing comprehensive construction cost.

An electrowetting system including a display device having a plurality of electrowetting elements, including a first electrowetting element and a second electrowetting element, each being configurable in a plurality of different display states; and a display controller for electrical addressing of the plurality of electrowetting elements in order to switch the plurality of electrowetting elements between different display states. The display controller is arranged to address the first electrowetting element twice subsequently, separated by a first addressing interval, and to address the second electrowetting element twice subsequently, separated by a second addressing interval, the second addressing interval being longer than the first addressing interval. The present invention further relates to a display controller, a driver stage and a method of controlling a display device.

The invention relates to a lighting system with a high-pressure discharge lamp and a control unit (W, FS, C1, W) for the high-pressure discharge lamp (1), where the lamp base (10) has at least two housing parts (10a, 10b) which are connected to one another by a releasable closure (22). The first housing part (10a) has fastening means (24) for the at least one lamp vessel (11). The high-voltage part (TR) of the ignition device (TR, FS, C1) is accommodated in the first housing part (10a), whilst the second housing part (10b) is provided with the electrical connections (20) for the high-pressure discharge lamp (1) and preferably contains the remaining components (FS, C1) of the ignition device and the voltage converter (W) of the control unit.

The invention discloses a broadband bandpass filter with frequency and bandwidth reconfigurable. The broadband bandpass filter comprises an upper-layer microstrip line structure, an active circuit, a middle-layer dielectric substrate, a lower-layer grounding metal paster and a metal through hole, wherein the metal through hole sequentially penetrates through the microstrip line structure, the dielectric substrate and the grounding metal paster so that the microstrip line structure and the grounding metal paster can be connected through the dielectric substrate, the microstrip line structure comprises a first port feeder line, a second port feeder line, a first resonator and a second resonator, the first port feeder line and the second port feeder line are symmetrical left and right, the first resonator is arranged above the first port feeder line and the second port feeder line, the second resonator is arranged below the first port feeder line and the second port feeder line, and the whole microstrip line structure is of a cross-shaped structure. The frequency and the bandwidth of the broadband bandpass filter can be independently reconfigurable, the two sides of a passband are each provided with a transmission zero point, the rectangularity and the selectivity of the filter are improved, and overall performance is good.

An in-the-ear hearing aid is to have a more compact design. For this purpose there is inserted into a housing shell an electronics module having all the electronic components of the hearing aid, the electronic components being secured to a flexible supporting structure. As a result of the open construction of the electronics module, the individual electronic components can be compactly inserted with short stranded wires, thus also increasing electromagnetic compatibility. The flexibility of the supporting structure enables allowance to be made for individually differing auditory canal shapes.

The invention relates to a light-dimmer driving circuit. The light-dimmer driving circuit comprises a power supply input module, a transformer, a current output driving module, a pulse width modulation (PWM) module, an input voltage sampling module, an output voltage sampling module and a control center, wherein the power supply input module is mainly used for rectification and filtering of an input voltage signal, the transformer is used for voltage reduction of the voltage signal output by the power supply input module, the current output driving module is used for driving of current output according to the voltage signal which is transformed, the PWM module is used for adjusting output power of the current output driving module according to a control signal in the control center, the input voltage sampling module is used for sampling of the input voltage signal and transmitting the input voltage signal to the control center, the output voltage sampling module is used for sampling of output voltage and transmitting the output voltage to the control center, and the control center is used for controlling a PWM signal according to an input voltage sampling signal, an output voltage sampling signal and an input current signal. According to the light-dimmer driving circuit, due to the fact that the control center is used for controlling the PWM signal according to the input voltage sampling signal, the output voltage sampling signal and the input current signal, the output power of the current output driving module is enabled to change evenly, flicker-free light adjusting is achieved, constant current output is achieved, and range of the light adjusting is wide.

The invention provides a single-frequency network-based passive radar system and a signal processing method for the same. A plurality of illumination sources for the system are used for simultaneously transmitting the same signals at the same frequency, and namely work in a single-frequency network system. A plurality of transmission stations and one or more receiving stations form a MISO (multiple-input single-output) or MIMO (multiple-input multiple-output) detection system, wherein the MIMO system is provided with a fusion center for performing communication and data transmission with each receiving station through a communication link and fusing processing results of each receiving station, and works at the same frequency; each transmission station is in the same form, and each receiving station is in the same form. A one-stop space-domain processing and single-frequency network defuzzification method is adopted for the signal processing method. According to the system and the method, a conventional broadcasting single-frequency network is used under the condition of no interference on broadcasting, so that the problems of severe clutter caused by the single-frequency network and fuzziness of the single-frequency network are solved, and the advantages of single-frequency network detection in frequency power reduction, hardware saving, detection stability and tracking continuity are fully exerted.

In a flat panel display (FPD), a conductive heat proof plate is inserted between the back surface of a display panel, on which printed circuit boards (PCBs) and signal lines are formed, and signal lines. A back frame positioned on the back surface of the display panel is provided to cover the printed circuit boards and the signal lines. A shield can is formed in the internal surface region of the back frame corresponding to the printed circuit board on which a timing controller is mounted. The shield can is electrically coupled to the heat proof plate to improve resistance against the electromagnetic compatibility of a large flat panel display and to improve a thermal characteristic.

The invention relates to a multifunctional phased array radar device. The multifunctional phased array radar device includes an antenna feeder extension, a transceiver extension, a frequency synthesisand system monitoring extension, an integrated signal and information processing extension, an integrated display and control extension and a power extension, wherein the antenna feeder extension includes a radar array surface and an antenna network, the antenna feeder extension completes radiation and reception of an electromagnetic wave signal, the transceiver extension performs digital-to-analog conversion and up and down conversion of the electromagnetic signal, the frequency synthesis and system monitoring extension generates an excitation signal, a system clock and a local oscillator and performs system monitoring, the integrated signal and information processing extension completes beamforming, radar signal processing and data processing, the integrated display and control extension is for human-computer interaction and information display, and the power extension provides the DC power. The multifunctional phased array radar device is advantaged in that through primary radar and secondary radar data fusion, the real-time information of all air targets can be acquired, target comprehensive information messages and the comprehensive situation information are formed, and display and report of the comprehensive information are further performed.

The invention discloses a reconfigurable dual-band band-pass filter which comprises an upper microstrip line structure, a middle dielectric substrate, a lower grounding metal patch and a metal through hole, wherein the metal through hole penetrates through the microstrip line structure, the dielectric substrate and the grounding metal patch in sequence to enable the microstrip line structure to be connected with the grounding metal patch through the dielectric substrate; the microstrip line structure comprises a first resonator, a second resonator, a third resonator and a fourth resonator; the first resonator and the second resonator are coupled to form a group of resonators after being folded; the third resonator and the fourth resonator are coupled to form another group of resonators after being folded; through the two groups of resonators, the microstrip line structure integrally forms a grid-shaped structure; one end of each resonator is loaded with a variable capacitance diode. According to the reconfigurable dual-band band-pass filter provided by the invention, the integration level and the electromagnetic compatibility of the system are improved; two pass bands are independently reconfigurable and the absolute bandwidth is basically constant, so that the application requirement of the conventional dual-band wireless communication system can be better satisfied.

A pressure measuring module for recording an absolute pressure or a relative pressure. Pressure measuring module includes a housing produced preferably as a premold, in which a pressure measuring chip is accommodated. The latter is contacted electrically either to a lead frame or to at least one printed circuit trace, at least one electronic component being provided, which is connected to a section of the lead frame or of the at least one printed circuit trace, exiting laterally from the housing that is produced as a premold, and is covered by a partition of a cover.

The invention discloses a novel vehicle control unit suitable for a pure electric vehicle. The novel vehicle control unit comprises a power source, a main MCU, an auxiliary MCU, a first signal processing circuit, a second signal processing circuit, a communication module and a power driving circuit; the output end of the first signal processing circuit is connected with the input end of the main MCU, the communication module and the power driving circuit are connected with the output end of the main MCU at the same time, the auxiliary MCU is connected with the main MCU to achieve bidirection communication, the second signal processing circuit is connected with the input end of the auxiliary MCU, and the output end of the auxiliary MCU is connected with the input end of the power driving circuit and the input end of the communication module. In the working process, the main MCU collects signals, calculates and processes the signals and then outputs a corresponding control instruction to a controlled mechanism, the auxiliary MCU collects heartbeat signals of the main MCU in real time, and when the main MCU breaks down, the auxiliary MCU executes the collection control process of the main MCU. Problems of a traditional vehicle control unit in resources, loading capacity, safety monitoring and the like are effectively solved.