28results about How to "Reduce peak" patented technology

The invention discloses a common-mode EMI noise suppression method combining a passive filter and a modulation strategy, and belongs to the technical field of power electronics and electricians. According to the method, an improved random switching frequency SVPWM (Space Vector Pulse Width Modulation) method is used, a common-mode voltage frequency spectrum without an EMI (Electro-Magnetic Interference) filter is obtained through measurement, a common-mode voltage amplitude is reduced from the source, the reduction of a common-mode electromagnetic interference frequency spectrum is further realized, required insertion loss is determined according to an EMC (Electro Magnetic Compatibility) standard, and an intersection point of the insertion loss and the minimum frequency is reached. And taking the frequency corresponding to the point as the cut-off frequency of the EMI filter, determining the element parameters of the filter according to the cut-off frequency, and verifying the element parameters. By using a common-mode interference comprehensive suppression means combining the filter and the random PWM strategy, the design margin of the filter can be reduced, the cut-off frequency of the EMI filter can be increased, the weight and the size of the inductor can be reduced, the light weight and the miniaturization of the filter can be realized, and the cost can be reduced. And meanwhile, the improved random switching frequency SVPWM is adopted, so that the filtering effect of the EMI filter is guaranteed.

The invention discloses a data synchronization method and device, and relates to the technical field of computers. The specific implementation mode of the method comprises the steps of obtaining a business change log in real time, and determining one or more pieces of first change data corresponding to the business change log; determining a timestamp of each piece of first change data, and determining a first minimum timestamp corresponding to the current preset time period based on each timestamp; in response to the fact that the first minimum timestamp does not reach the preset time node, storing the first change data corresponding to the current preset time period into an intermediate database according to the timestamp; and in response to the first minimum timestamp reaching the preset time node, obtaining second change data corresponding to a historical preset time period before the current preset time period in the intermediate database, and performing zipper operation on the second change data and historical data in the data warehouse. According to the embodiment, streaming processing is realized, and meanwhile, the data integrity in the data zipper process is ensured.

The invention discloses a switching power supply, and aims to generate a small current to charge an output capacitor by controlling the working state of a bus protection switch in a short circuit detection stage, so as to judge whether a short circuit occurs by detecting whether an output voltage can rise to a preset value or not. According to the short circuit detection method, bus detection resistance and differential sampling are not needed, the design difficulty of chip pins and chips can be reduced, secondly, in the soft start stage, the power-on time is prolonged, the peak value of the charging current of the output capacitor is reduced, the voltage of the output capacitor is made to rise slowly, the rising slope of the output voltage is reduced, and therefore the output voltage is improved. Therefore, the output voltage reaches the level equal to the input voltage, loss in the soft start process is reduced, the system efficiency is improved, and the safety is high.

The invention discloses an interleaved parallel flyback micro inverter control method and device, and a readable medium. The method comprises the steps of obtaining a direct current voltage and a direct current of a photovoltaic module at an input end of a micro inverter, and performing maximum power point tracking calculation to obtain a reference output power; obtaining a power grid voltage instantaneous value and carrying out effective value calculation to obtain a power grid voltage effective value; calculating a grid-connected reference current effective value according to the reference output power and the grid voltage effective value; by setting a secondary side current overlapping factor and calculating and adjusting the switching frequency and the duty ratio, a secondary side current overlapping area is reduced to the greatest extent, and the peak value of the secondary side current can be reduced as far as possible, so that the current stress of a flyback diode and a power frequency flip circuit switching tube is reduced, and the grid-connected current quality is improved.

The invention discloses a structure for improving plasma stability. The structure comprises a radio frequency generator, a matcher, a discharge adjusting resistor and a plasma load structure. The output end of the radio frequency generator is connected with the input end of the matcher, the output end of the matcher is connected with the first end of the discharge adjusting resistor, and the second end of the discharge adjusting resistor is connected with the plasma load structure. The discharge adjusting resistor is used for providing a discharge adjusting voltage in direct proportion to a discharge current when the discharge current is generated in the plasma load structure, so that the discharge voltage on the plasma load structure is reduced, and the plasma stability is improved. The invention further discloses a method for improving plasma stability. According to the invention, the discharge voltage of the plasma can be controlled, so that the plasma discharge is stable, the arc generation probability is reduced, and the product process and the productivity can be improved.

The invention relates to a sponge storage yard arrangement structure of an automatic container and an implementation method thereof, and relates to the field of drainage. The structure comprises a box corner foundation, a filling area, an open drain, two groups of PMG tracks and a surrounding net. The implementation method comprises the steps that a plurality of prefabricated open trench modules and filling area modules are produced in a factory and transported to a construction site to be rapidly assembled; the filling area integrally sinks horizontally, and the pavement is formed by permeable pavement; a multi-stage filtering system is arranged on the stepped open drain; when the storage yard encounters rainstorm, rainwater is naturally accumulated and permeated in the sunken filling area, and if the rainstorm exceeds a certain amount, the rainwater enters the stepped open drain. The mode of'natural accumulation, natural permeation and natural purification 'of a sponge city is met by combining the elevation of the filling area of the container area, the paving of the filling area and the open trench structure of the filling area, and the manufacturing cost and the construction time are saved.

The invention discloses a power dispatching strategy determination method and device and electronic equipment. The method comprises the following steps: acquiring region parameters of a target power region; according to the region parameters, determining a target function with the purpose of minimizing the power consumption cost of the target power region and a first constraint condition for constraining the target function; and determining a power dispatching strategy corresponding to the target power region according to the target function under the first constraint condition. According to the method and the device, the technical problems that only the adjustable load equipment is adjusted when the power dispatching strategy of the target power area is determined, the number of adjustable resources is small, and the power operation cost is high in the prior art are solved.

The present invention is an ultra-low nitrogen gas burner, comprising a burner housing, a flame tube, a central gas distributor assembly, a bypass ignition gun assembly, a central gun mechanism, a damper adjustment mechanism assembly and a burner control box, wherein the flame tube is installed at the front end of the burner housing through a rotating flange assembly, the central gas distributor assembly is arranged at the center of the inner cavity of the rotating flange assembly, the bypass ignition gun assembly is fixedly installed on the central gas distributor assembly, the central gun mechanism is arranged at the center of the inner cavity of the central gas distributor assembly, the damper adjustment mechanism assembly is arranged on one side of the burner housing, the gas burner control box is arranged on the other side of the burner housing, the first gas supply channel is connected to the central gas distributor assembly, the second gas supply channel is connected to the central gun mechanism through a central metal hose, and the third gas supply channel is connected to the bypass ignition gun assembly through a bypass ignition metal hose. Beneficial effect: The furnace temperature can be reduced, thereby reducing the generation of NOX.

The present invention belongs to the field of electromagnetic compatibility, and relates to an anti-rebound interference power supply filter for suppressing the counter-interference generated by the current surge during the operation of electrical equipment with high-power IGBT elements as the core on the DC power bus. It is mainly used in the DC power supply system of Dongfeng diesel locomotives to suppress the counter-interference generated by the current surge during the operation of the air-conditioning inverter connected to the locomotive power bus on the bus, and improve the reliability and safety of other electrical equipment in the same power bus. The power supply filter includes: a group of π-type low-frequency filter circuits for suppressing electromagnetic interference of low-frequency components, a group of fourth-order Butterworth high-frequency filter circuits for suppressing electromagnetic interference of medium and high-frequency components, and a group of RDC damping absorption circuits with redundancy for suppressing high-amplitude DC current surges. The low-frequency filter circuit and high-frequency filter circuit of the present invention adopt a fully balanced circuit structure, so that the surge of counter-interference can be suppressed when it is connected to the bus from the positive terminal or the negative terminal.

The invention relates to the technical field of display, in particular to a power supply control system and a display device. The power supply control system comprises a battery management chip and a display driving chip; the display driving chip comprises a first pin and a second pin, the first pin is used for at least outputting a first control signal, the second pin is used for at least outputting a second control signal, the first control signal is used for enabling the battery management chip to output a first voltage signal to the display driving chip, and the second control signal is used for enabling the battery management chip to output a second voltage signal; the second control signal is used for enabling the battery management chip to output a second voltage signal to the display driving chip; the battery management chip comprises a third pin and a fourth pin, the third pin is used for at least receiving the first control signal, and the fourth pin is used for at least receiving the second control signal; at least one first resistor is connected in series between the first pin and the third pin, and / or at least one first resistor is connected in series between the second pin and the fourth pin; the first resistor and the display driving chip are arranged adjacently. According to the invention, the product yield is effectively improved.

The invention provides an HEMT device and a preparation method thereof, the HEMT device comprises a semiconductor structure, a gate structure, a source electrode, a drain electrode, a strain compensation layer and a source field plate structure, the semiconductor structure comprises a substrate, a buffer layer, a channel layer and a barrier layer; the gate structure comprises a cap layer located on the upper surface of the barrier layer. The source electrode and the drain electrode are located on the opposite sides of the gate structure in the X direction and electrically connected with the barrier layer. The strain compensation layer comprises a first strain compensation layer and a second strain compensation layer, the first strain compensation layer is located on the upper surface of the barrier layer between the source and the gate structure and is adjacent to the gate structure, and the second strain compensation layer is located on the upper surface of the barrier layer between the drain and the gate structure and is spaced from the gate structure by a preset distance; the source field plate structure is electrically connected with the source electrode and comprises a first field plate, a second field plate and a third field plate which are arranged at intervals. Through the arrangement of the strain compensation layer and the source field plate structure, the on resistance of the device is reduced, and the voltage endurance capability of the device is improved.

This invention discloses a composite-terminated vertical Schottky diode combining a BaTiO3 / Si3N4 dielectric field plate and ion implantation. A composite dielectric layer composed of Si3N4 and BaTiO3 layers is used, with an anode field plate disposed on the composite dielectric layer. Fluorine ions are implanted into a drift layer below the anode to form a fluorine implantation region. Part of the fluorine implantation region is located below the anode, and another part is located below the composite dielectric layer, forming a composite termination. This composite termination structure effectively modulates the electric field distribution on the device surface and within the device bulk, ultimately effectively reducing the electric field strength at the anode edge and achieving a higher breakdown voltage. This provides an effective solution for the termination design of high-performance high-voltage Schottky diode power devices.

The invention relates to a time-delay acceleration feedback control method for improving vehicle driving smoothness. The time-delay acceleration feedback control method comprises the steps that a target vehicle active suspension mathematical model under time-delay acceleration feedback control is established; based on the target vehicle active suspension mathematical model, sprung mass, suspension dynamic stroke and tire dynamic load under simple harmonic road excitation are obtained; establishing a characteristic model of the suspension system, and obtaining a relation curve of a feedback gain coefficient g and a time lag tau which meet a preset condition on a g-tau plane; based on the relation curve of g and tau and the mathematical model of the active suspension of the target vehicle, a stability partition map of the suspension system on the g-tau plane is obtained; constructing a target function; determining an optimization target based on the amplitude of the target function; and in combination with the stability partition map and the optimization target, obtaining an optimization value of tau. According to the invention, the vibration control effect of the suspension system can be optimized within the broadband of 4-12.5 Hz.

The invention relates to an electromechanical actuator for actuating a shading device, such as a roller blind or a blind, comprising a housing, a head intended to be fastened to a fixed structure, a synchronous motor, a speed reducer and a motor control unit, the motor, the speed reducer and the control unit being inserted into the housing of the electromechanical actuator, the motor comprising: a cylindrical rotor; a cylindrical stator disposed coaxially around the rotor and including a plurality of teeth extending radially toward the rotor; and a coil wound around each of the teeth of the stator; the stator has an outer diameter of less than 55 mm, the rotor is formed from an assembly of sheet metal plates and comprises recesses around a longitudinal axis of the rotor, the rotor comprises an arrangement of recesses forming four magnetic poles, each magnetic pole of the rotor comprising two or three recesses.

The invention relates to the field of building construction, in particular to a space truss supporting system which comprises space truss supporting structures arranged between surrounding purlins, and each space truss supporting structure is provided with a space truss structure, adjusting pieces at the two ends and a prestress device connected with the adjusting pieces. The space truss structure is composed of a plurality of space truss standard units which are sequentially connected, each unit comprises a node, a steel support standard section, a transverse stabilizer bar, an oblique stabilizer bar and the like, and at least one layer of rectangular pyramid connecting rod structure is composed of the transverse stabilizer bar and the oblique stabilizer bar. The adjusting piece is formed by connecting an L-shaped hanging arm and an adjusting head, and the prestress device and the node can be adjustably connected. Compared with the prior art, the space truss system is constructed, the calculated length of the steel support is reduced, the horizontal and vertical stability is improved, self-weight internal force deformation is reduced, free combination can be achieved to adapt to various foundation pits, universal joints of nodes are high in adaptability, and an efficient and reliable supporting solution is provided for underground structure construction and foundation pit safety guarantee.

The application relates to a medical image processing method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring a sample artifact image set; each sample artifact image in the sample artifact image set is obtained by performing magnetic resonance scanning on each scanning sample by using an echo imaging sequence; a template magnetic resonance image corresponding to each scanning sample is determined by using a reference echo scanning method; a neural network to be trained is trained according to the sample artifact image corresponding to each scanning sample and the corresponding template magnetic resonance image, so as to obtain a trained image artifact elimination model; and the image artifact elimination model is used for performing peak correction on a magnetic resonance image to be eliminated. The method can improve the artifact removal efficiency of the magnetic resonance image.

The invention relates to the technical field of power systems, and particularly discloses a power distribution network interval voltage regulation method considering multi-dimensional meteorological factor coupling, which comprises the following steps: S1, introducing the uncertainty of meteorological factors through an improved non-parametric kernel density estimation method of multi-meteorological factor coupling, and performing estimation by using a joint probability density function, generating a confidence interval of the meteorological factors; s2, through an affine algorithm based on a forced boundary and spatial approximation, calculating an interval of photovoltaic power generation power and load demand based on a meteorological factor confidence interval; and S3, constructing a power distribution network interval voltage regulation optimization model by taking the minimum total voltage regulation cost as a target, inputting the photovoltaic power generation power interval and the load demand interval into the power distribution network interval voltage regulation optimization model, and outputting an optimized voltage regulation scheme. The method has the advantages that the uncertainty caused by the previous correlation of a plurality of meteorological factors is solved, the voltage regulation optimization model is constructed to obtain an accurate voltage regulation scheme, and the voltage regulation cost is effectively reduced.

The present invention relates to the field of high-speed train vehicle equipment technology and aerodynamic noise control technology, and provides a high-speed train snowplow, including a snowplow body, the snowplow body is a flat streamlined structure, the end of the snowplow body close to the bogie cabin is the rear end, and an active jet module for adding three-dimensional disturbance to the airflow is provided, and the other end of the snowplow body is the windward surface. Compared with the prior art, the present invention has an active jet module, which can effectively add three-dimensional disturbance to the airflow through multiple jet ports, thereby reducing the excitation of the airflow on the acoustic mode inside the bogie cabin, and effectively reducing the peak value of the top of the bogie cabin, the peak value of the rear wall and the amplitude of broadband aerodynamic noise.

The invention belongs to the technical field of blasting engineering, and particularly discloses a novel non-coupling smooth blasting method. The blasting method comprises the steps that a row of peripheral holes are formed in the junction of a roadway driving working face and a surrounding rock retaining area, and slotting holes and auxiliary holes are formed in the inner sides of the peripheral holes; designing peripheral hole parameters and a charging structure; a blast hole arrangement diagram is drawn, and holes are distributed; according to the parameter design, peripheral holes, slotting holes and auxiliary hole cartridge bags are manufactured; according to the parameter design, the peripheral holes are filled with the explosive packages in an axial and radial non-coupling explosive loading mode, and the slotting holes and the auxiliary holes are filled with the explosive packages in an axial continuous explosive loading mode; a blasting network is connected and checked, then the slotting holes and the auxiliary holes are detonated firstly, and then the peripheral holes are detonated; a blasting vibration tester is arranged outside the blasting source, and the blasting vibration speed is collected to monitor the blasting vibration magnitude. The explosive loading amount of the peripheral holes and the peak pressure of detonation on the hole walls can be reduced, so that the smooth blasting effect is improved, and the blasting harm caused by blasting vibration is reduced.

The present application relates to a kind of continuous zoom lens, belong to the field of optoelectronic technology, solve the problem of not enough smooth, stable in continuous zooming process in prior art.A kind of continuous zoom lens includes lens, lens barrel, cam, zoom motor and gear;Cam includes inner and outer cams, outer cam is rotatably sleeved on inner cam, inner cam is sleeved on zooming, compensation group lens barrel, zooming group, compensation group lens barrel is respectively fixed with zooming, compensation group pin;Outer cam side wall has the zooming guide slot according to zooming group outer cam curve processing, the compensation guide slot according to compensation group outer cam curve processing, zooming group outer cam curve and compensation group outer cam curve are the curve obtained by optimization algorithm of particle swarm optimization.8 times continuous zooming is realized, optical system structure is compact, volume weight is smaller, and zooming group and compensation group are moved according to optimal curve mode, the suppression of the maximum pressure angle of cam curve is realized, and the zooming process is smooth, stable, and the imaging quality is good.

The invention discloses an arched multiple anti-collision buffering device, and relates to the technical field of building structure collision resistance, an arched anti-collision layer comprises an arched outer plate, an arched foamed aluminum plate, an arched inner plate, an end limiting square steel pipe and an anti-collision layer high-strength bolt; the energy absorption layer comprises a middle foamed aluminum plate, end foamed aluminum plates, Z-shaped positioning plates, a bottom plate and energy absorption layer high-strength bolts. The device can effectively perform impact protection on the building structure, has multiple anti-impact buffering effects, avoids direct collision between an impact object and the protected building structure, reduces impact load to protect the impact object, reduces load peak and energy transmitted to the protected building structure, and improves the safety of the building structure. And the risk of collision damage of the protected building structure is reduced. If the building structure is damaged in the process of protecting the building structure under the impact load effect by using the device, the function of the device can be recovered by directly and simply replacing the damaged part, and the economic cost and the time cost of protection can be greatly reduced.

The vibration absorption structure is installed on a motor body so as to absorb vibration generated by a motor, the vibration absorption structure comprises a plurality of vibration absorption units arranged on the circumferential surface of the motor body at intervals, each vibration absorption unit comprises an elastic piece and a balancing weight, and the elastic pieces are arranged on the circumferential surface of the motor body. The elastic piece is attached to the surface of the motor body, and the balancing weight is connected to the tail end, in the axial direction of the motor body, of the elastic piece; the first ratios of the at least two vibration absorption units are different, and the first ratio is the ratio of the length of the elastic piece to the mass of the balancing weight. According to the vibration absorption structure, the fan comprising the vibration absorption structure and the range hood comprising the vibration absorption structure, through the vibration absorption structure, vibration of the motor body is reduced from the source, noise is effectively reduced, the peak value of multi-frequency vibration is effectively reduced in an elastic vibration absorption mode, abnormal noise is avoided, and the sound experience effect is improved.

The electric vehicle coordinated charging scheduling method based on the micro-grid comprises the following steps: based on collected charging information, simulating randomness of electric vehicles in combination with a Monte Carlo simulation (MCS) method, and obtaining a charging demand of each electric vehicle; establishing a coordinated charging scheduling optimization model by taking minimization of the overall peak-valley load difference as a target function, and considering various limitations of slow charging of the electric vehicle, quick charging of the electric vehicle and operation of the micro-grid; solving the coordinated charging scheduling optimization model, generating a scheduling strategy and transmitting the scheduling strategy to an electric vehicle aggregator; and the electric vehicle aggregator charges different electricity demands according to the scheduling instruction. The result shows that the charging mode selection of the electric vehicle owner and the peak load shifting of the micro-grid operation are realized, and the peak value, the range and the variance of the load are reduced, so that the safety and the reliability of the micro-grid are improved.

The present invention provides a resonance structure and a silencer composed of the same, wherein the resonance structure includes surrounding sealing plates, internal side resonance plates and two side surface resonance plates, the internal side resonance plates are at least one group, and the setting direction is consistent with the sound propagation direction; the two side surface resonance plates are composed of microporous sound absorbing plates, and / or panels, and / or perforated plates. The silencer containing the resonance structure can greatly improve the low-frequency and high-frequency sound absorbing effects and broaden the frequency band of sound absorbing while ensuring that the mid-frequency sound absorbing effect meets the requirements; resistive sound absorbing materials can also be filled in the resonance structure as needed to further improve the high-frequency and mid-frequency sound absorbing effects; in addition, the applicability of different sound absorbing frequencies can be improved by adjusting the internal structure of the resonance structure.

The invention relates to a switching power supply ripple detection technology, aims to solve the problems that an existing detection device is low in sampling precision and detection precision, poor in output ripple stability and the like, and provides a detection device and a suppression method for direct-current output high-frequency ripples, and the detection device comprises a device mounting plate, a positive conductive strip and a negative conductive strip. Two ends of the device mounting plate are respectively a direct-current input end and a direct-current output end; the positive and negative conductive strips are fixed on the device mounting plate and are connected with positive and negative electrodes of the direct-current input end; a filter capacitor, a common-mode balance magnetic ring, an output capacitor and a sampling detection device are sequentially connected in parallel between the direct-current input end and the direct-current output end of the device mounting plate, and a resistor-capacitor damping unit is connected in parallel between the sampling detection device and the direct-current output end and used for absorbing high-frequency resonance; positive and negative electrodes of the direct current output end are respectively connected with a plurality of capacitors for reducing common-mode noise; the detection device can effectively reduce the effective value and the peak-to-peak value of high-frequency ripples and improve the sampling precision and the detection precision.

This invention relates to the field of integrated circuit technology, specifically to a Class F series resonant voltage-controlled oscillator, which consists of four identical unit circuits connected end to end to form a closed loop structure. Each unit circuit includes an active circuit and an LC series resonant network. The LC series resonant network includes a main resonant cavity and an auxiliary resonant cavity. This invention achieves a systematic improvement in phase noise performance through the series resonant topology and harmonic shaping mechanism.

The invention discloses a micro light emitting diode dynamic control system, control method and control device based on a multi-core heterogeneous chip. A task management and light field analysis unit TMU writes an analyzed light field descriptor set into an on-chip shared memory and sends a doorbell signal to a neural mimicry computing cluster NPU; a neural mimicry computing cluster NPU receives the light field descriptor from a task management and light field analysis unit TMU, reads historical data from a distributed shared memory, writes a processing result into the distributed shared memory, and triggers a high-precision driving computing cluster HPU and a distributed pixel driving network DPS; the high-precision driving calculation cluster HPU receives the instruction and the data, reads accurate parameters from the distributed shared memory and issues a final driving micro instruction to the distributed pixel driving network DPS; and the distributed pixel driving network DPS is used for receiving microinstructions and local parameters from the high-precision driving calculation cluster HPU. And inherent contradictions among power consumption, bandwidth, service life and display quality are solved.

The application provides a super-high-voltage junction field-effect tube device with high lightning surge tolerance and a manufacturing method thereof. The super-high-voltage junction field-effect tube device comprises a substrate, the substrate has a first deep well, a second deep well, a first high-doped well and a second high-doped well, the second high-doped well is in communication with the first deep well and the second deep well; the substrate has a one-well connected with the first high-doped well, the one-well has a first body region formed therein; the substrate has a two-well connected with the second high-doped well, the two-well has a second body region formed therein; the first deep well has a source electrode formed therein, the second deep well has a drain electrode formed therein, the second deep well has an isolation layer formed thereon, and the isolation layer has a gate electrode formed thereon; the first body region is in communication with the gate electrode through a contact hole, the source electrode and the drain electrode each has a contact hole, and the second body region has no contact hole. The application removes the contact hole of the second body region, adds a high-doped well, increases the length of the lightning current path, and improves the lightning surge performance.