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134results about How to "Reduce design difficulty" patented technology

High-voltage pulse power supply for plasma sewage treatment system

ActiveCN103219913AReduce design difficultyReduce lossPower gridPlasma reactor
The invention discloses a high-voltage pulse power supply for a plasma sewage treatment system. The high-voltage pulse power supply comprises a power frequency rectifying and filtering circuit, a first-stage boosted circuit, a second-stage boosted circuit and a voltage coupling circuit. The power frequency rectifying and filtering circuit is connected with a municipal power grid to convert power frequency alternating current into direct current. An input end and an output end of the first-stage boosted circuit are respectively connected with an output end of the power frequency rectifying and filtering circuit and an input end of the second-stage boosted circuit to achieve the functions of boosting and rectifying and filtering. The second-stage boosted circuit is boosted again and outputs stable high-voltage direct current and stable high-voltage alternating current. The voltage coupling circuit couples and superimposes the alternating current and the direct current and loads the alternating current and the direct current to equivalent loads of a plasma reactor. According to the high-voltage pulse power supply for the plasma sewage treatment system, the traditional method that two independent alternating-current power supply and direct-current power supply are used for carrying out coupling discharging is changed, the number of needed hardware components is decreased to a great extent, space and cost are saved, loss is reduced, and reliability and stability of a power supply system are improved.
Owner:SOUTHEAST UNIV

Projection type planar waveguide helmet-mounted displayer

ActiveCN103885184AReduce design difficultyReduce stray lightOptical light guidesHelmet-mounted displayWaveguide
The invention discloses a projection type planar waveguide helmet-mounted displayer. The projection type planar waveguide helmet-mounted displayer comprises a mini-type display device, a projection optical system, a planar waveguide and a reflection type projection screen, the planar waveguide is internally provided with an optical coupling-in end and an optical coupling-out end, and light rays sent by the mini-type display device are imaged through the projection optical system and are transmitted to enter the optical coupling-in end of the planar waveguide. The optical coupling-in end reflects the received light rays to enable the reflected light rays to be totally reflected between two reflection planes of the planar waveguide many times to be transmitted to the optical coupling-out end of the planar waveguide. The optical coupling-out end reflects the received light rays to the reflection type projection screen. The reflection type projection screen reflects the received light rays to enable the light rays to return according to the original path, then the light rays are transmitted to the human eyes from the optical coupling-out end of the planar waveguide. By means of the method, the problem that an existing helmet-mounted displayer is large is solved, the observing view field can be expanded by designing different structures, and the designing difficulty of the projection optical system is reduced.
Owner:BEIJING NEDPLUSAR DISPLAY TECH CO LTD

Semi-underground large-size horizontal vacuum container for plume test

The invention discloses a semi-underground large-size horizontal vacuum container for plume test research, which comprises a vacuum container, a vacuum acquiring system, a propellant supply system and a matching foundation, belongs to the field of brand-new tests, is different from the traditional ring die devices and is specially used for the plume effect test research of an engine. The semi-underground large-size horizontal vacuum container is designed into a semi-underground structure, the low-half part of the vacuum container is positioned below the horizontal plane, the vertical distance from the central axis of the vacuum container to the horizontal plane is 1.3m and is controlled to be within a range of the body height of an adult, and thus, a worker conveniently installs and maintains test devices such as an engine at the central axis in the vacuum container; and the diameter of a door is about 2.4m, the design difficulty of the door is lowered, the door is conveniently opened or closed, people enters or exits from the door, and thus, the demand of the flume test is met. The lower end of a rear saddle is fixed firmly by using a base plate and a rear bearing foundation, and thus, the radial movement of the vacuum container is avoided, and the height of the rear saddle can be regulated through the thickness of the base plate.
Owner:BEIHANG UNIV

LLC resonant converter and control method

The invention discloses an LLC resonant converter and a control method, and the LLC resonant converter is lower in design difficulty, and comprises an inverter circuit, an LLC resonant cavity, a transformer and a rectification network which are sequentially connected from the input to the output. The LLC resonant cavity comprises a resonant inductor Lr, an excitation inductor Lm and a resonant capacitor Cr, and is additionally provided with a two-way switch; the resonant inductor Lr and the resonant capacitor Cr are connected in series between the first output end of the inverter circuit and the first end of the primary side coil of the transformer. The second output end of the inverter circuit is connected with the second end of the primary side coil of the transformer, the excitation inductor Lm is connected with the primary side coil of the transformer in parallel, the first end of the two-way switch is connected with the first end of the primary side coil of the transformer by being connected between the resonance inductor Lr and the resonance capacitor Cr, and the second end of the two-way switch is connected with the second end of the primary side coil of the transformer; theresonant inductor Lr is connected between the first end of the two-way switch and the first end of the primary side coil of the transformer, and the resonant capacitor Cr is connected between the first end of the two-way switch and the first output end of the inverter circuit.
Owner:MORNSUN GUANGZHOU SCI & TECH

Sampling time error correction method for multi-channel parallel analog-digital converter (ADC) system

ActiveCN104393872AEliminate aliasing issuesReduce design difficultyAnalogue/digital conversion calibration/testingVIT signalsCorrection method
The invention discloses a sampling time error correction method for a multi-channel parallel ADC system. The method comprises the steps that the output end of an analog low-pass filter and the input end of the multi-channel parallel ADC system are connected through a switching circuit, and an analog input signal x (t) enters the analog low-pass filter to obtain a narrow-band analog signal d (t), the multi-channel parallel ADC system samples the d (t) to obtain a multi-channel sampling output signal yd (n), and LMS-frequency domain self-adaption estimation is performed on the yd (n) to obtain a sampling time error omega (n); sending the analog input signal x (t) into the multi-channel parallel ADC system through the switching circuit, performing sampling to obtain a sampling output signal y (n) which is processed by a digital differential analyzer and then subjected to a first multiplying unit with omega (n) to obtain a system error signal c (n), and y (n) and c (n) are subjected to a subtractor to obtain the corrected output signal yc (n). According to the method, the problems of aliasing and the difficulty in achieving of high-rate hardware circuits are solved on the basis of error correction.
Owner:DATANG MICROELECTRONICS TECH CO LTD

Device for adjusting laser beam divergence angle in real time

The invention discloses a device for adjusting a laser beam divergence angle in real time. In the device, a beam expander secondary mirror, a fixed wedged mirror, a guide rail and a beam expander main mirror are sequentially fixed on a base, the vertical light transmission surface of the fixed wedged mirror is arranged opposite to the beam expander secondary mirror; the guide rail is parallel to the inclined light transmission surface of the fixed wedged mirror, a translation platform is arranged on the guide rail, an adjustable wedged mirror is arranged on the translation platform; the inclined light transmission surface of the adjustable wedged mirror is arranged opposite to the inclined light transmission surface of the fixed wedged mirror in parallel; the translation platform is used for carrying the adjustable wedged mirror to move along the guide rail, and laser varies with the changes of the lens thickness of the adjustable wedged mirror so as to change a light path between the beam expander main mirror and the beam expander secondary mirror and achieve the aim of changing the laser beam divergence angle. In the process of changing the laser beam divergence angle by the device for adjusting the laser beam divergence angle in real time, which is provided by the invention, a laser transmitter optical axis can be kept stable so that the emitted laser stably irradiates on a target favorably. The device for adjusting the laser beam divergence angle in real time, provided by the invention, has the advantages of simple structure and convenience in use and is suitable for application to a high-accuracy focusing system.
Owner:INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS

Magneto-acoustic coupling imaging excitation and detection method and device based on low-frequency continuous waves

ActiveCN104013388AThe experimental setup is simpleReduce design difficultyDiagnostic recording/measuringSensorsVIT signalsContinuous wave signal
Disclosed are a magneto-acoustic coupling imaging excitation and detection method and device based on low-frequency continuous waves. The method comprises the two steps of generation of excitation signals of the low-frequency continuous waves and detection of the low-frequency continuous magneto-acoustic waves. According to generation of the excitation signals, the low-frequency continuous waves are used for conducting excitation on an imaging sample, the excitation waveform is realized by adopting continuous sine waves or continuous sine pulses with a duty ratio, and the frequency of the excitation signals is determined according to the imaging sample and spatial locating precision. Detection of the low-frequency continuous magneto-acoustic waves is realized by the adoption of a continuous wave signal detection method or a lock-in amplifying method. The device comprises a function generator used for generating the excitation signals of the low-frequency continuous waves and a power amplifier connected with the output end of the function generator and used for conducting amplifying on the output excitation signals, the output end of the power amplified is connected to the detected sample placed in a magnetic field and the output end of the function generator is further connected with a detector. The magneto-acoustic coupling imaging excitation and detection method and device have the advantages that the test devices are simplified, the excitation source designing difficulty is lowered and the application safety of the imaging method is improved to some extent.
Owner:INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI

Three-terminal atom switching device and preparing method thereof

The invention discloses a three-terminal atom switching device and a preparing method thereof, and belongs to the technical field of microelectronic manufacturing and memorizers. The three-terminal atom switching device comprises a stacking structure comprising a source end and a drain end, a vertical groove formed by etching the stacking structure, an M8XY6 channel layer formed on the inner wall and the bottom of the vertical groove, and a control end formed on the surfaces of the M8XY6 channel layer, the vertical groove is full of the control end, and a source end resistor and a drain end resistor are regulated through the control end. On the basis of the three-terminal atom switching device, the high switching ratio characteristic is achieved in the height nonlinearity changing characteristic of the resistance between the source end and the drain end along with the voltage of the control end, the structure is simple, integration is easy, density is high, cost is low, the three-terminal atom switching device can be applied to a gating tube of a cross array structure, and the crosstalk phenomenon caused by leakage current is restrained. The three-terminal atom switching device is also suitable for a plane stacking cross array structure and a vertical cross array structure, and the high-density three-dimensional storage is achieved.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI

Cryptographic device and implementation method thereof

The present invention discloses a cryptographic device and an implementation method thereof. A field programmable gate array system-level chip integrates an embedded ARM processor, and the field programmable gate array system-level chip is internally provided with a finite state machine; the ARM processor is connected with and communicates with the field programmable gate array system-level chip through an external memory interface; a nonvolatile flash memory is connected with the ARM processor and is configured to store firework programs, first secret keys and data of the ARM processor; and the finite state machine is connected with a plurality of cryptographic algorithm modules and a plurality of random number generators, the finite state machine is configured to schedule the cryptographic algorithm modules and the random number generators, and the random number generators are configured to generate true random numbers. The implementation method comprises the steps that: the ARM processor analyzes control instruction information and data to be decrypted received by the cryptographic device, determines whether the first secret keys are needed to be used or not, different secret keys are used in different conditions, and encryption and decryption operation and operation data transmission are completed.
Owner:AEROSPACE INFORMATION

Anti-collision 77GHz millimeter wave radar antenna for automobile

The invention relates to an anti-collision radar antenna for an automobile, in particular to an anti-collision 77GHz millimeter wave radar antenna for the automobile, and belongs to the technical field of radar. A way of combining an antenna and lenses is adopted. The radar antenna consists of a lens support plate, a microwave circuit support plate, a plurality of dielectric lenses, a transmission antenna, a plurality of receiving antennae and corresponding wireless transmission and reception control modules, wherein the wireless transmission and reception control module integrates a transmission control module and a reception control module; the transmission antenna is a single wide-beam antenna; the reception antenna is a multi-beam antenna formed by adopting a plurality of narrow beam antennae; the beamforming of the transmission antenna and the receiving antennae is realized by adopting the dielectric lenses; the dielectric lenses are independently hanged on the lens support plate; and the transmission antenna and the receiving antennae are all arranged on the microwave circuit support plate. The anti-collision 77GHz millimeter wave radar antenna for the automobile has a flexible design and a simple structure, ensures system stability, sensitivity and accuracy and can realize the highly-accurate angle measurement and rapid switching of the receiving antennae.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1

AMOLED column driving circuit and driving method thereof

The invention provides an AMOLED column driving circuit and a driving method thereof. The AMOLED column driving circuit comprises a linear digital-analog conversion circuit; a Gamma correction output stage circuit used for carrying out Gamma correction on analog signals output by the linear digital-analog conversion circuit and driving an OLED pixel array to emit light; a clock control signal generation circuit used for providing clock signals and control signals; and a bias circuit used for providing a reference voltage. The AMOLED column driving method comprises the steps of: converting digital signals into the analog signals, carrying out Gamma correction on the analog signals, and then inputting the analog signals after the Gamma correction into the OLED pixel array so as to drive the OLED pixel array to emit light. According to the invention, the linear DAC does not generate precision losses in the AMOLED column driving circuit, complex matching work is not needed by a resistor string when a resistor string DAC is used, and the design difficulty is lowered; in addition, the DAC relatively small in size can be adopted, the integral area of the circuit is further reduced, and the AMOLED column driving circuit has the advantages of simple design, small area, high precision, good image displaying effect and the like.
Owner:SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI

Energy safeguard design method for an inertial space observation satellite

The invention provides an energy safeguard design method for an inertial space observation satellite. The energy safeguard design method comprises the following steps: (1) determining an inertial space observation satellite body coordinate system and a fixed sun-facing surface according to a satellite basic configuration and a solar wing mounting direction; (2) designing an attitude control algorithm on the basis of a fixed sun alignment surface, and minimizing an included angle between a solar vector and a vertical plane of a sailboard mounting shaft in a single observation process on the premise of ensuring observation direction and observation coverage required by observation; (3) designing a solar wing tracking algorithm according to the change rule of solar vectors based on an attitude control algorithm design result, so that the whole satellite obtains the maximum energy in the whole observation process; And (4) judging whether the energy design requirement is met by the satellites in the whole observation process or not, if so, ending, and otherwise, re-executing the steps (1)-(4). Excellent solar cell illumination conditions can be provided for the satellite system, the design difficulty of the satellite energy system is reduced, and energy supply of the whole satellite is ensured.
Owner:BEIJING INST OF SPACECRAFT SYST ENG

Antenna component and mobile terminal

The invention relates to the technical field of communication, and particularly relates to an antenna component and a mobile terminal. The antenna component comprises a rear cover provided with a closed metal middle frame free of breakpoint, and a circuit board which is arranged in the rear cover. The metal middle frame comprises a top plate and a side plate which curvely extends from the tail end of the top plate. The top plate is used for forming a diversity antenna. The circuit board is located in the metal middle frame. The circuit board comprises a grounding point and a feeding point. The feeding point and the grounding point are respectively electrically connected with the metal middle frame. A clearance area is arranged between the circuit board and the side plate along the extending direction of the circuit board. The circuit board and the clearance area form a three-in-one antenna. The three-in-one antenna is composed of a GPS antenna, a WIFI-2.4G antenna and a WIFI-5G antenna. According to the invention, the three-in-one antenna is arranged on the side; the diversity antenna is arranged on the top plate; the layout space of the diversity antenna is increased; the design difficulty of the diversity antenna is reduced; and the performance of the diversity antenna is ensured.
Owner:AAC TECH NANJING
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