40results about How to "Small cross-coupling" patented technology

A single-inductance double-output switch power supply based on ripple control comprises a power level module, a filter and voltage sampling module, a secondary voltage sampling module, a secondary ripple control module, a primary voltage sampling module, a primary control module and a driving module, wherein the output of the power level module is connected with the filter and voltage sampling module, the output of the filter and voltage sampling module is connected with each of the secondary voltage sampling module and the primary voltage sampling module, the output of the secondary voltage sampling module is connected with the secondary ripple control module, the output of the primary voltage sampling module is connected with the primary control module, the outputs of the secondary ripple control module and the primary control module are connected with the driving module, and the output of the driving module is connected with the power level module and the secondary ripple control module and also outputs a slope compensation power source Islope signal to the secondary voltage sampling module.

The application exposes a miniature four-channel circular flow type triaxial silicon jet gyro; the jet gyro comprises a four-channel circular flow type triaxial angular velocity sensitive element and a PCB, and the sensitive element is electrically connected with the PCB, wherein the sensitive element comprises a PMMA upper cover, an upper silicon board, a lower silicon board, a PMMA bottom cover and a piezoelectric ceramic round oscillator; the piezoelectric ceramic round oscillator is embedded in the PMMA upper cover; the upper silicon board is provided with a jet network; the lower silicon board is provided with a jet network and a hot line; the PMMA upper cover, the upper silicon board, the lower silicon board and the PMMA bottom cover are successively bonded to form the sensitive element. The jet gyro adopts one piezoelectric ceramic round oscillator to drive four-channel circular flow, not only is simple in structure, long in life and low in power consumption, and implements deformation direction of the piezoelectric ceramic round oscillator and direction turning of jet flow network planes; the area of the piezoelectric ceramic round oscillator is large, the driving ability is strong, the jet velocity is high, and the jet gyro sensitivity is high; and angular velocities of three orthogonal directions can be sensitive at the same time, and multi-axis integration is achieved.

The invention provides a rotor punching structure for a permanent-magnet servo motor, and the structure comprises a rotor punching body. The peripheral surface of the rotor punching body is provided with permanent magnet tanks, and the interior of each permanent magnet tank is provided with a permanent magnet in an embedded manner. The external circle of the rotor punching body above the permanent magnet tanks is not concentric with the internal circle of a stator. The rotor punching body above the permanent magnet tanks is provided with magnetic isolation holes which are arranged horizontally, and the rotor punching body below the permanent magnet tanks is provided with an axial cooling channel. The permanent magnet tanks are radially arranged in a layered manner, and magnetic isolation tanks are respectively disposed between the adjacent permanent magnet tanks. Magnetic isolation bridges are disposed among the magnetic isolation tanks and the permanent magnet tanks. Through the improvement of the rotor punching structure and the control of the direction of a magnetic field, the nonlinear impact, caused by the coupling of quadrature-axis and direct-axis magnetic circuits, on motor parameters is reduced, and the space of a rotor punching is used fully for placing permanent magnets as many as possible. Moreover, the capability of resistance to demagnetizing and the overbearing capability of the permanent-magnet servo motor are improved, and the operation performance of the permanent-magnet servo motor is effectively improved.

The present invention discloses a silicon MEMS piezoresistive acceleration sensor which belongs to the art of micro-mechanical sensors. The present invention comprises a silicon frame, a quality block, a torsion girder, a sensitive girder and a voltage dependent resistor; wherein, the left and the right sides of the quality block are provided with sensitive girders in symmetry which are connected with the silicon frame, and the end part on the upper surface of the sensitive girder is provided with the voltage dependent resistor; the front and the rear sides of the quality block are provided with a pair of symmetrical torsion girders which are connected with the silicon frame, the height of the quality block is vertically higher than that of the sensitive girder. The piezoresistive acceleration sensor provided by the present invention is a micro sensor using the voltage dependent resistor that is arranged on the upper surface of the structure to test the lateral acceleration signal; can avoid the sophisticated technique making the voltage dependent resistor on the profile of the structure; reduces the difficulty of processing; improves the accuracy, consistency and good yield of resistor processing; and easily realizes three-axial integration. The sensor has the advantages of small body, light weight, small crossover coupling, high reliability, low cost and easy combination.

Disclosed is an array ultrasonic probe, including a plurality of channels arranged with spaces, each channel having a piezoelectric element and a laminated acoustic matching layer structure formed of at least three layers and arranged on the piezoelectric element, a backing on which the piezoelectric element of each channel is mounted and having trenches in which are formed at places corresponding to the spaces, and an acoustic lens formed to cover at least the surface of the uppermost acoustic matching layer of each channel, wherein the uppermost acoustic matching layer comprises a silicone resin-containing mixture having a Shore hardness D not lower than 40 at 25 DEG C., and exhibits an acoustic impedance of 1.8 to 2.5 MRayls at 25 DEG C.

The invention discloses a system for measuring loss of an optical resonant cavity based on an optical cavity ring-down method and mainly overcomes the defect that the conventional system cannot measure the loss of a ground mode and a high-order mode simultaneously. The whole measurement system comprises a laser (1), an acousto-optic switch (2), an optical system (3), a resonant cavity fixing device (8), a ring-down light signal measurement device (15) and a main control computer (14); the laser sends a laser beam which enters the resonant cavity to be measured through the acousto-optic switchand the optical system to form resonant light; when the light intensity of the resonant light is greater than the preset turn-off threshold value of the acousto-optic switch, the acousto-optic switchis turned off to ensure that the resonant cavity to be measured generates ring-down light in a plurality of modes; the ring-down light is subjected to photoelectric conversion and analog-to-digital conversion and then is transmitted to the main control computer; and the main control computer fits and calculates the acquired data so as to obtain the loss of a plurality of laser modes. The system has the advantage of measuring the loss of the plurality of laser modes of the optical resonant cavity simultaneously and is suitable for high-efficiency measurement of the loss of the optical resonantcavity.

The invention discloses an error matrix compensation method of a monopulse tracking receiver system, relating to compensation for system errors in a two-dimensional self-tracking system in the field of communication. The method comprises the following steps: analyzing the reason causing the error of the tracking receiver system; obtaining a system error compensation matrix through formula deduction; measuring and analyzing a large amount of test data to determine specific parameters of the compensation matrix; and finally introducing the compensation matrix into a ground digital tracking receiver to eliminate the system error. The method has the characteristics that the equipment is simple, the use and maintenance are convenient, the performance is stable and reliable and the like; and the method is especially suitable for a two-dimensional tracking receiver in a measurement and control system for the measurement and control of unmanned aerial vehicle and the like.

The invention discloses a vehicle five-phase permanent magnet fault-tolerant motor considering position sensor compensation. The vehicle five-phase permanent magnet fault-tolerant motor includes a stator, a rotor and a rotating shaft, armature teeth and fault-tolerant teeth are evenly distributed on an inner ring of the stator in the circumferential direction at intervals, armature windings are wound on the armature teeth, and every two adjacent armature windings are separated by the corresponding fault-tolerant teeth; the tooth width of the armature teeth are larger than that of the fault-tolerant teeth, and the tooth tops of the armature teeth and the fault-tolerant teeth are flattened; permanent magnets and iron core poles are arranged evenly in the circumferential direction of the rotor at intervals, the permanent magnets are placed in a V shape to form permanent magnet pairs, and V-shaped openings face air gaps; the iron core poles in the middles of the permanent magnet pairs aresecond iron core poles, the iron core poles between the adjacent permanent magnet pairs are first iron core poles, and the edges of the first iron core poles and the second iron core poles are all arcsurfaces; and air magnetic barriers are formed between the arc surfaces and stator teeth, zero low speed operation of five-phase permanent magnet fault-tolerant motor without position sensor controlcan be realized, and while improving basic performance of the motor, reliability and fault-tolerance performance of a motor driving system are further improved.

The present invention discloses a micro accelerator. The device comprises an upper cover plate, a mass block, a lower cover plate, a cantilever beam and an enclosure frame. The upper cover plate and the lower cover plate are oppositely arranged to form a space, one end of the enclosure frame is connected with the lower surface of the upper cover plate, and the other end of the enclosure frame is connected with the upper surface of the lower cover plate; the mass block is connected with the enclosure frame though the cantilever beam and is arranged in the space formed by the upper cover plate and the lower cover plate; and the cantilever beam has a bending shape and is configured to support the mass block to move up and down in the space formed by the upper cover plate and the lower cover plate. The present invention further discloses the manufacturing method of the micro accelerator. The method comprises curtain coating, punching and through-hole filling, alignment, lamination, cofiring, assembling and detection, etc. The LTCC difference capacitive micro accelerator has the cantilever beam which has a bending shape such as a U-shaped structure, and is simple in preparation; and moreover, the micro accelerator is low in measurement result drifting, small in temperature effect and high in sensitivity, small in detection modal stiffness, small in cross coupling and good in combination property.

The invention discloses an S-frequency-band monopulse self-tracking antenna system which comprises an antenna and a feed source system. The feed source system comprises an antenna feed source and a beam forming network (12). The antenna feed source comprises five crossed vibrators (8) which are arranged in a rhombus distribution structure. One crossed vibrator (8) is a central vibrator unit arranged on the point of intersection of diagonal lines of the rhombus. The other four crossed vibrators (8) are outside vibrator units which are arranged on the four vertexes of the rhombus respectively. The five crossed vibrators (8) receive signals. The beam forming network (12) comprises a sum signal forming circuit and a difference signal forming circuit. The sum signal forming circuit is connected with the central vibrator unit. The difference signal forming circuit is connected with the outside vibrator units. According to the S-frequency-band monopulse self-tracking antenna system, the central vibrator unit receives a formed sum signal, the outside vibrator units receive formed difference signals, and therefore monopulse self-tracking is achieved.

The invention provides a method for enhancing the tracking convergence of an angle tracking system simulator. Through utilization of the method, cross coupling and an error accumulation can be reduced, and the convergence of an angle tracking process is improved. The method is achieved through the following technical scheme: after accurate amplitude adjustment, precision of which is better than 0.01dB, is performed on an intermediate frequency signal by a simulator signal processing unit, the adjusted intermediate frequency signal is divided into three signals, i.e., a sum signal, an azimuth sub signal and an elevation sub signal, via a demultiplexer, amplitude attenuations are performed on the three signals through the numerical control attenuators receiving an attenuation control command corresponding to simulator monitoring software, the sum signal after the corresponding amplitude attenuation directly sends to a tracking receiver, the azimuth and elevation sub signals send polarity switching respectively via 0 / [Pi] switchers under the control of the simulator monitoring software, the switched azimuth and elevation sub signals are synthesized into a difference signal in a quadrature synthesizer, the difference signal is sent to the tracking receiver, and the tracking receiver extracts an angle error signal according to the sum signal and the difference signal and sends the angle error signal to an antenna servo feedback system so that an antenna is controlled to rotate in a direction facing to a target.

The invention provides a 0 / pi modulated angle-measurement method based on phase accumulative Doppler frequency offset compensation. Two completely same CP data segments (the symbol length is 128) andFrank sequences are inserted after a synchronous sequence in a frame structure; after detecting that a data frame arrives through the synchronous sequence, a receiving end performs complex correlationoperation of the received two Frank sequences; the phase difference of the two Frank sequences is calculated according to an obtained complex correlation value; therefore, the size of frequency offset is calculated, so that frequency offset compensation is completed; and, influence of frequency offset on the angle-measurement performance is reduced by adoption of a non-coherent demodulation-amplitude envelope detection technology. A frequency offset estimation algorithm in the invention is high in precision; influence of the frequency offset on the angle-measurement performance and requirements of a tracking receiver on the phase consistency of sum and difference channels can be reduced; and anti-multipath functional expansion under a time-varying channel can be supported.

The invention discloses a measuring system of relative position of a laser mode and an aperture and a measuring method thereof, and mainly solves the disadvantage of low measurement precision of present systems. The whole system comprises a laser (1), an optical system (15), a resonator to be measured (6), a spectroscope (7), a total reflective mirror (8), an image acquisition and data acquisition system (16), a main control computer (13), and a piezoelectric ceramics driver (14); the piezoelectric ceramics driver drives the laser to output laser; the optical system is adjusted to allow the laser outputted by the laser to be coupled to the resonator to be measured; the laser outputted by the resonator to be measured are divided into two paths by the spectroscope and the total reflective mirror; the two-path laser is collected and transmitted to the main control computer by the image acquisition and data acquisition system; the main control computer processes images of the aperture andthe laser mode by using a high-precision image processing algorithm, and calculates the central coordinates of the aperture and the laser mode respectively. The invention has the advantages of synchronous CCD camera acquisition and sawtooth wave signals, and high measurement precision, and is applicable to the high-precision automatic regulation of the laser.

The invention provides an information processing model generation method based on target attribute decoupling and related equipment, and the method comprises the steps of obtaining feature maps outputby a hidden layer, carrying out the coding of the feature maps through Hash codes, and obtaining coordinate values corresponding to all feature maps; clustering the feature maps according to the coordinate values to obtain a feature map group, respectively calculating orthogonal loss and / or inhibition loss corresponding to the feature graphs in each feature graph group, obtaining a total loss value of the model according to the calculated orthogonal loss and / or inhibition loss, adjusting model parameters by utilizing the total loss value of the model, and repeating the above steps until the training is completed, so as to obtain a generated information processing model. According to the method provided by the embodiment of the invention, the attribute coupling is reduced by mining the semantic attributes of the latent layer and constructing the orthogonal loss of the clustering group, and the cross coupling according to the attributes is reduced by performing intersection suppressionon the feature maps in the intersection region, so that the attribute coupling between the feature maps is reduced, and the generalization ability of the network is improved.

The invention belongs to the technical field of microwave communication, and specifically relates to a high-temperature superconductive diplexer. The technical scheme of the high-isolation high-temperature superconductive diplexer is that two filter channels are respectively arranged at the left and right sides of a common port, and form a T-shaped structure together with the common port, and are mutually connected with each other through a microstrip line; the filter channels, the common port and the microstrip line are processed on an upper layer (1) of a substrate (2); an lower layer of the substrate (2) is a ground layer (3); the substrate (2) is made of magnesium oxide MgO material, or lanthanum aluminate LaAlO3 material and sapphire material; the dielectric constant of the substrate (2) is set as 9.7, and the thickness of the substrate (2) is set as 0.5mm; and both the upper layer (1) and the ground layer (3) are yttrium barium copper oxygen (YBCO) superconductive films. The high-isolation high-temperature superconductive diplexer and the design method thereof can effectively improve the isolation and avoid discontinuity of the microstrip line because of spot welding connection so as to enable the impedance characteristic of a transmission line after preparation to be identical to the design. Therefore, a diplexer with high performance can be obtained.

The invention discloses a miniature microphone of a FBAR structure on a diaphragm. The miniature microphone comprises a substrate, a detection element, and a composite elastic supporting layer. The substrate is disposed on the lower part of the composite elastic supporting layer, the detection element is disposed on the upper part of the composite elastic supporting layer, and the composite elastic supporting layer is used to support the detection element. The substrate comprises a Si substrate and a cavity. The Si substrate is in the shape of a cuboid, and the middle part of the Si substrate is provided with a trumpet-shaped through hole. The smaller end of the aperture of the through hole is disposed on the upper surface of the Si substrate, and the upper surface of the Si substrate is tightly attached to the lower surface of the composite elastic supporting layer, and the cavity can be formed between the through hole and the composite elastic supporting layer. The part of the composite elastic supporting layer corresponding to the top surface of the cavity is the elastic diaphragm, which is used to form the vibration diaphragm, and the top surface and the side surface of the cavity can be used to form the acoustic wave reflection interfaces. The detection element comprises a FBAR, a lead, and a pad, and the FBAR is connected with the pad by the lead. The miniature microphone is advantageous in that the manufacturability is good, the temperature stability is high, the intermodal cross coupling is small, and the mechanical strength is high.

The application discloses a four-wire sensitive structured silicon microchemical triaxial jet gyroscope, comprising a four-wire sensitive structured jet angular velocity sensing element and a PCB (printed circuit board) electrically connected to the same, wherein the sensing element comprises a pressure ring, a piezoelectric ceramic circular vibrator, a PMMA (polymethyl methacrylate) plate and a silicon plate; the piezoelectric ceramic circular vibrator is embedded onto the PMMA plate, and the edge of the vibrato is fixed through the pressure ring; the PMMA plate is provided with an air passage; the silicon plate is provided with an air passage and hot wires; the PMMA plate and the silicon plate are boned in sequence to form the four-wire sensitive structured jet angular velocity sensing element. A novel triaxial sensing principle that may sense angular velocities of three orthogonal axes, X, Y and Z axes, just by using four hot wires; the sensing element only has two layers; therefore, the jet gyroscope has few hot wires, simple structure, high yield and low power consumption and can the angular velocities of three orthogonal directions (X, Y and Z), the multiple axes are integrated, the sensitivities of the three directions are of same order of magnitude, and the practicality is high.

A double-end DDQ type three-phase wireless dynamic charging system for an electric automobile comprises a primary side rectifying circuit, an inversion and primary compensation circuit, a primary side coil, a receiving end secondary side coil on the automobile, a secondary compensation and rectifying circuit and a DC / DC circuit, which are electrically connected. The primary side coil and the secondary side coil are respectively provided with a group of Q-type coils and two groups of DD coils, the Q-type coils, the first group of DD coils and the second group of DD coils of the primary side coil and the secondary side coil are respectively wound on iron cores of the primary side coil and the secondary side coil, and the second group of DD coils and the first group of DD coils of the primary side coil and the secondary side coil are distributed at 90 degrees; and the size ratio of the Q-type coil and the DD coil of the primary side coil to the size ratio of the Q-type coil and the DD coil of the secondary side coil is 1: 2. According to the invention, the charging cost is reduced, the power supply conversion efficiency is improved, the anti-offset characteristic of the whole equipment is enhanced, the reduction of the charging efficiency caused by horizontal offset is reduced, the cross coupling of the power supply is effectively reduced, and the transmission power of electric energy is improved.

The invention provides a method for enhancing the tracking convergence of an angle tracking system simulator. Through utilization of the method, cross coupling and an error accumulation can be reduced, and the convergence of an angle tracking process is improved. The method is achieved through the following technical scheme: after accurate amplitude adjustment, precision of which is better than 0.01dB, is performed on an intermediate frequency signal by a simulator signal processing unit, the adjusted intermediate frequency signal is divided into three signals, i.e., a sum signal, an azimuth sub signal and an elevation sub signal, via a demultiplexer, amplitude attenuations are performed on the three signals through the numerical control attenuators receiving an attenuation control command corresponding to simulator monitoring software, the sum signal after the corresponding amplitude attenuation directly sends to a tracking receiver, the azimuth and elevation sub signals send polarity switching respectively via 0 / [Pi] switchers under the control of the simulator monitoring software, the switched azimuth and elevation sub signals are synthesized into a difference signal in a quadrature synthesizer, the difference signal is sent to the tracking receiver, and the tracking receiver extracts an angle error signal according to the sum signal and the difference signal and sends the angle error signal to an antenna servo feedback system so that an antenna is controlled to rotate in a direction facing to a target.

The invention discloses a five-phase permanent magnet motor position-sensorless driving method and device capable of meeting variable working conditions of an electric vehicle, and the implementation comprises the steps: providing a five-phase magnetic flux enhanced permanent magnet fault-tolerant motor which is more suitable for position-sensorless control and electric vehicle operation characteristics based on a compensation idea; a rotor position self-detection method is used for compensating the function of a position sensor, and position-sensorless operation in a full-speed domain is achieved; a disturbance self-adaptive controller with high robustness is designed, and it is ensured that high-quality torque can still be obtained when the motor breaks down; when the motor breaks down, redundant coordinate transformation and voltage compensation are not needed, non-reconstruction of the driving system under different faults is achieved, the complexity of the driving system under composite faults is reduced, and the reliability of the driving system under multiple operation conditions is improved. The technical constraints of fault tolerance and no position sensor of a traditional permanent magnet motor are broken through, the motor and the driving controller are comprehensively considered, and a new thought is provided for improving the performance of a vehicle motor driving system.