72results about How to "Reduce radiation interference" patented technology

The invention discloses an intelligent universal light modulator which comprises a main supply interface, a load interface, a light modulation circuit, a current zero crossing point detection circuit, a voltage zero crossing point detection circuit and a controller. The light modulation circuit is sued for controlling breakover time and interval within each mains supply period through the controller so as to achieve regulation on a load device. The current zero crossing point detection circuit is used for acquiring and inputting a current zero crossing point signal on a mains supply live wire to the controller. The voltage zero crossing point detection circuit is used for acquiring and inputting a voltage zero crossing point signal into the controller. The controller is used for analyzing the current zero crossing point signal and the voltage zero crossing point signal and judging whether a device connected to the load interface is a capacitive device or a sensitive device, controlling the light modulation circuit in a leading edge phase-cut mode when the device connected to the load interface is the sensitive device and controlling the light modulation circuit in a lagging edge phase-cut mode when the device connected to the load interface is the capacitive device.

The invention discloses a phase type laser distance measuring system. The system comprises a laser for generating laser signals; an emission signal unit for generating emission signals and sending the emission signals to the laser after amplitude adjustment and power amplification are successively performed on the emission signals; a returning light receiving unit for receiving reflection signals of laser signals; a bias driving unit for providing offset voltages for driving the laser to emit the laser signals; and a controller for outputting PWM pulse voltage signals with an adjustable duty ratio to the bias driving unit to form the offset voltages and receive the emission signals. When the controller receives that the emission signals involves weak reflection, the controller reduces the duty ratio of the PWM pulse voltage signals and improves the amplitude of the emission signals in a linkage mode; and when the controller receives that the emission signals involves strong reflection, the controller increases the duty ratio of the PWM pulse voltage signals and reduces the amplitude of the emission signals in a linkage mode. The system provided by the invention has the advantages of simple system, high anti-interference capability and high distance measuring accuracy.

This invention relates to a single-board RF system used in microwaves and millimeter waves, especially to an X band chip integrated waveguide single-board RF system including a medium chip set with an antenna, a duplexer, a RF receive noise amplifier, a RF receive filter, a lower converter, a local power splitter, an upper converter, a RF emission filter, an emission power amplifier, an IF emission circuit, a RF local phase lock loop and an IF receiving circuit.

The invention relates to the technical field of navigation radars, and specifically relates to a detecting method of a cognitive cable frequency modulation pulse navigation radar system. The method comprises steps of emitted signal waveform of a cable frequency modulation pulse radar with controllable parameters, control rule of emission of pulse waveform parameters, control algorithm of emissionof pulse waveform parameters, control process of emission of pulse waveform parameters, multi-diversity solution associated processing of clutter and target detection processing, and information sensing of radar target and environment echo thereof. The method has strong clutter (particularly sea clutter) suppression capability, better target distinguishing performance and smaller distance dead zone and more stable target detection and tracking performance, thereby being an environment-friendly radar detecting method.

The invention provides a decontamination plant for radioactive aerosol and a treatment method thereof. The plant mainly comprises equipment body parts, wherein one side of the equipment body is provided with an air inlet, the other side of the equipment body is provided with an air outlet, and the equipment body is internally provided with a preposed filtering part, an electrocoagulation and collection part, a draught fan and a tail end filtration and adsorption part in turn from the side where the air inlet locates to the other side. The decontamination plant for the radioactive aerosol and the treatment method thereof have the advantages that filtration technology, electrocoagulation and collection technology and adsorption technology are coupled to decontaminate gas containing radioactive aerosol, submicron particles are coagulated into micron particles, the particle size range of to-be-removed particles is enlarged, and the removal rate of the radioactive aerosol particles in the gas reaches up to 99% or above. The decontamination plant for radioactive aerosol and the treatment method thereof have the advantages that each part of the plant is differently designed, parts of theparts are designed into drawer type structures, the structure optimization and layout optimization are used to achieve high-efficiency combination, each part can be dismounted separately, and the operation and maintenance are convenient.

The invention relates to a filter of an impulse power output port of motor speed controllers. The filter comprises a passive filter circuit and whole shielding of the circuit, and the filter is characterized in that the passive filter circuit is an interference reflection circuit which is fixed in a shielding casing, and the interference reflection circuit is formed by a first common mode inductor and a second common mode inductor which are provided with same winding numbers and connected through a tandem connection line. The filter can be suitable to power output ends of the motor speed controllers in different types, protects winding insulation of a motor of servo systems in different types, simultaneously restrains conducted interference of a power output line of the motor speed controller, effectively reduces radiated interference of the servo system, and greatly improves an electromagnetic environment of site sensitive equipment.

The embodiment of the invention provides an unmanned aerial vehicle shielding cable grounding point determination method and device, a cable and an unmanned aerial vehicle. The method comprises: obtaining the working wavelength corresponding to each airborne device in the unmanned aerial vehicle; and determining a grounding unit length based on the obtained shortest working wavelength in the working wavelengths, determining a grounding interval point of the shielding cable by taking the joint of the shielding cable and each airborne device as a starting point and taking a length smaller than or equal to the grounding unit length as an interval, and determining a point where the grounding interval point is connected with the reference ground as a grounding point. The embodiment of the invention can improve the electromagnetic compatibility of the unmanned aerial vehicle.

The invention provides an EMC solution for an inverter welding machine. The EMC solution comprises an EMI filter rectifier circuit, an active power correction circuit, a flyback switching power circuit, a double-switch single-ended forward driving circuit and a switching power synchronization circuit, wherein the EMI filter rectifier circuit is used for filtering various interference signals entering the inverter welding machine through a power grid; the active power correction circuit is used for correcting current input into the welding machine, reducing harmonics caused by current distortion, and increasing the utilization rate of the welding machine over the electric energy of the power grid; the flyback switching power circuit is used for providing stable direct current voltage output; the double-switch single-ended forward driving circuit is used for performing power amplification on a PWM signal output by the flyback switching power circuit in the manner that the double-switch single-ended forward driving circuit can be driven by the PWM signal subjected to power amplification to work; the switching power synchronization circuit is used for filtering a negative signal output by the double-switch single-ended forward driving circuit, and stabilizing, amplifying and feeding the negative signal back to the flyback switching power circuit to synchronize the working frequency and the working frequency of a switching power supply.

A subscriber station for a bus system and a method for reducing line-conducted emissions in a bus system are provided. The subscriber station includes a first delay element for delaying a signal of a bus of the bus system and a second delay element for delaying a signal of a bus of the bus system, the delay time of the first and second delay element being capable of being digitally set as a function of the bus state or independently for rising and falling signal edges at the bus of the bus system in order to carry out a signal symmetrization during the rising and falling signal edge at the bus.

The invention discloses a category 5 enhanced shielding network cable. The category 5 enhanced shielding network cable comprises an outer protective sleeve, a plurality of winding and pairing sets, aluminum foil polyester tape layers and a tensile wire. The aluminum foil polyester tape layers are arranged on the inner side of the outer protective sleeve, the plurality of winding and pairing sets and the tensile wire are arranged inside the aluminum foil polyester tape layers, each winding and pairing set is formed by two sets of wire cores being twisted, and the wire cores comprise guide cores and inner protective layers wrapping outside the guide cores. Through the method, the category 5 enhanced shielding network cable can reduce radiation interference, is high in shielding performance and is long in service life.

The invention discloses a hanging ironing machine. The hanging ironing machine comprises a shell, a steam generator, a spraying head, a sub-ultrasonic generator and a receiver. The steam generator is arranged inside the shell, the spraying head is arranged outside the shell and connected with the steam generator so that steam can be provided for the spraying head, and multiple spraying holes are formed in the spraying head. The sub-ultrasonic generator is arranged on the spraying head, the receiver is arranged inside the shell and used for receiving sub-ultrasonic waves emitted by the sub-ultrasonic generator, and the steam generator is started or stopped after the receiver receives the sub-ultrasonic waves. According to the hanging ironing machine, the sub-ultrasonic generator is arranged on the spraying head, in this way, a user is effectively prevented from frequently bowing for operation, and operation is convenient and rapid; because the sub-ultrasonic generator is in a passive mode, a complex power source, an installing circuit and a driving circuit are omitted, then energy is saved, the structure of the spraying head is simplified, installing is convenient, and the cost is low. In addition, the control reliability of the sub-ultrasonic generator is high, and radiated interference is small.

The invention discloses a 3D switching type PCB. The circuit board comprises a PNL board and a PCB arranged on the PNL board. The PCB is provided with at least one inner groove, the edge of each innergroove is provided with an edge covering groove and a connecting position, the connecting positions are used for connecting the inner grooves and connecting the inner grooves and the PNL board, the PCB is reasonable in design, the edge covering grooves can reduce board edge radiation interference, and transmission of high-speed signals is guaranteed. The invention further provides a manufacturingmethod of the 3D switching type PCB, all the steps are easy to control, the problems of burrs and burrs of the edge covering groove are effectively avoided, the precision of the sizes and positions of the edge covering groove and the inner groove is improved, and the reliability of long-term use of a product is improved.

A power tube driver of a class-D audio amplifier includes high-side and low-side fixed charge/discharge gate driving circuits, high-side and low-side power tubes, a dead time generation circuit based on gate voltage detection, high-side and low-side gate charge/discharge accelerating circuits, and high-side and low-side gate voltage detection circuits. The class-D audio amplifier with the features of low radiation interference, and high efficiency, linearity and robustness can be balanced easily.

The invention relates to an apparatus and method for eliminating electromagnetic interference. The apparatus for eliminating the electromagnetic interference comprises a time sequence control chip anda lock phase loop module, wherein the lock phase loop module is electrically connected with the time sequence control chip and comprises a phase detection unit which is used for detecting frequency generated by a clock period and generating a frequency difference, a charge pump unit which is used for generating an adjusting voltage, a voltage control oscillator unit which is used for controllingthe oscillation frequency when the adjusting voltage is input, a plurality of frequency divider units which are used for converting an input clock frequency to a novel output clock frequency, and a selector unit which is used for selecting an appropriate frequency divider unit, and the other end of the selector unit is electrically connected with a needed power supply circuit.

The invention provides a complete machine system of an underwater robot and the underwater robot and relates to the technical field of underwater robots. The complete machine system includes: a powersupply unit, a light control unit, a power unit, a video transmission unit, a wireless image transmission unit and a signal transmission unit. One or more of the power supply unit, the light control unit, the power unit, the video transmission unit, the signal transmission unit and the wireless image transmission unit are provided with EMC modules. By arranging the EMC modules in the complete machine system, irradiation interference is reduced therewith, so that electromagnetic environment of the complete machine system is improved well.

The embodiment of the invention discloses an LED driving circuit and an LED display device, and belongs to the technical field of LEDs. Comprising a receiving card and at least one backboard signal driving unit. The receiving card sends a group of control signals to each backboard signal driving unit; the backboard signal driving unit comprises a plurality of groups of output ports connected with the lamp panel connector, receives a group of control signals, divides the control signals into a plurality of groups of sub-control signals, and outputs a group of sub-control signals to each group of output ports; wherein the signal type contained in one group of sub-control signals is consistent with the signal type contained in one group of control signals. According to the technical scheme, the control signals are transmitted from the receiving card to the lamp panel connector in the form of groups, so that the crossing among the control signal wires can be reduced, the generation of signal cross-division can be reduced, the quality of the control signals is ensured, and the radiation interference of a product can be reduced.

The invention discloses a variable period cycle controller for triggering thyristors, which comprises a case and further comprises a V-F converter circuit, an R-S trigger circuit, a two-way frequencydivider circuit, a pulse stretcher circuit, a zero-crossing pulse inverter circuit, a trigger board circuit, a signal conversion circuit, a power supply circuit and a terminal strip. The invention discloses a variable period cycle controller for triggering a thyristor. the number of output cycles can be changed to realize the function of continuously adjusting the output power; meanwhile, the temperature control is more accurate; temperature fluctuation is small, the variable-period cyclic waves are controlled at intervals in a minimum period; the sine wave zero-crossing trigger is adopted, the thyristor outputs complete sine waves, the radiation interference, conduction interference and transient surge of load current of the thyristor are minimum, and under the operation mode, the triggerboard circuit emits a series of pulse sequences when the sine wave zero-crossing occurs, so that the thyristor can be conducted quickly and is not prone to damage.

The invention relates to a two-way driving recorder. The two-way driving recorder comprises a front lens main machine, a back lens auxiliary machine, a sensing device and a vehicle power supply, wherein the front lens main machine is mounted on the front side of a vehicle body and is connected with a built-in video and audio main machine in a vehicle; the back lens auxiliary machine is mounted onthe back side of the vehicle body and is connected with the video and audio main machine; the sensing device is used for collecting environmental data inside and outside the vehicle body and outputting a detection signal to the front lens main machine and/or the back lens auxiliary machine; the vehicle power supply supplies power to the video and audio main machine, the front lens main machine, the back lens auxiliary machine and the sensing device; a 200w-pixel and high-dynamic range camera is arranged on each of the front lens main machine and the back lens auxiliary machine; the front lensmain machine and the back lens auxiliary machine are connected with the video and audio main machine through fully shielded high-definition cables. Through adoption of the 200w-pixel and high-dynamicrange cameras, full high-definition images can be shot; the fully shielded high-definition cables are used for equipment connection, radiation interference is low, radiation requirements in safety regulations are met, and no harm is done to a human body.