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 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 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 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 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.

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.