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40results about How to "Reduce volume cost" patented technology

Brushless direct current motor driving system for capacitor-less direct-current converter

The invention discloses a brushless direct current motor driving system for a capacitor-less direct-current converter. The converter is evolved from a conventional Buck converter; and in an evolution process, Buck bus capacitors are removed, and a switch tube is in parallel connection with an inductor so as to provide a continuous current circuit for the inductor at the commutation moment of a motor. The driving system employs a speed and current double closed-loop control manner, and inner and outer loops are controlled by PI regulators. According to the invention, the switch tube is subjected to PWM chopping, and charging and discharging of the inductor are controlled, so that phase currents of the brushless direct current motor are controlled. The driving topology simplifies the pre-stage topology structure of a conventional Buck circuit brushless direct current motor driving system, conventional voltage control is replaced by current control, and the driving topology is suitable for driving the brushless direct current motor whose ideal current waveforms are square waves. Compared with the Buck converter, the converter topology does not need the bus capacitors, so that the cost and size of the driving system are greatly reduced.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

X-band high-integration-level two-dimensional phased array radar radio frequency front end

The invention belongs to the technical field of phased array radars, and relates to an X-band high-integration-level two-dimensional phased array radar radio frequency front end. The X-band high-integration-level two-dimensional phased array radar radio frequency front end comprises an antenna housing, active phased array subarrays adopting a silicon-based TR chip, a heat dissipation shell, a power division and synthesis network, a wave control power supply board, a sum-difference network, a frequency synthesizer receiver and a data acquisition board, the heat dissipation shell serves as a main body support, the multiple active phased array subarrays are installed on the heat dissipation shell, heat generated by the active phased array subarrays is conducted to the heat dissipation shell, and the heat is conducted to the two sides of the heat dissipation shell through heat pipes on the back of the heat dissipation shell. The sum-difference network and the wave control power panel are correspondingly arranged on the same plane, and the wave control power panel and the sum-difference network are installed on the back face of the heat dissipation shell and share the back area. The X-band high-integration-level two-dimensional phased array radar radio frequency front end has the characteristics of low cost, high integration level, modularization, strong heat dissipation capability and high reliability, and has rapid maintenance capability.
Owner:西安天安电子科技有限公司

AC-DC chip and high-voltage free-wheel diode integrated chip structure and power module group

The invention provides an AC-DC chip and high-voltage free-wheel diode integrated chip structure, and belongs to the technical field of electronic device. The structure is characterized in that the interior of a plastic package body is provided with a first chip, a second chip, at least one lead frame, and a plurality of metal leads. The first chip is an AC-DC chip, and the second chip is a free-wheel diode chip. One bonding pad of the first chip is connected with a high-voltage power supply pin of the plastic package body through the metal leads, and a drain electrode of the first chip is connected with an anode of the second chip, wherein the surface of the cathode of the second chip is provided with a bonding pad, and is connected with the high-voltage power supply pin. The anode of thesecond chip is connected with a lead frame, and is lead out of the plastic package body to serve as a drain electrode pin. The invention also discloses the power module group employing the above integrated chip. Two core devices in a power drive board are integrated into one chip, and the number of pins of the new integrated chip and the pin positions still can be completely compatible with an original AC-DC chip, thereby avoiding the increase of the size of the chip while reducing the number of drive power devices, improving the production efficiency, and reducing the size and cost of the power supply.
Owner:SHANDONG JINGDAO MICROELECTRONICS +1

Small integrated YTF non-linear characteristic testing system and method

The invention discloses a small integrated YTF non-linear characteristic testing system and method. The mall integrated YTF non-linear characteristic testing system includes a PC machine connected to a processor, the processor is connected to a YIG tuned filter through a digital-to-analogue conversion module and a current-to-voltage conversion module in sequence, the processor is further connected to a first radio-frequency switch through a broadband signal generator, the first radio-frequency switch is connected to a second radio-frequency switch which is connected to the YIG tuned filter, and the second radio-frequency switch is further connected to a third radio-frequency switch; the output end of the YIG tuned filter is connected with the third radio-frequency switch which is connected to a broadband signal electrical-level detection module, and the broadband signal electrical-level detection module is connected to the processor through the digital-to-analogue conversion module. Compared with a traditional testing method, the system greatly reduces the complexity and does not rely on other external instruments or equipment any more, the volume cost is greatly reduced, and actual tests show that the system can accurately extract non-linear characteristics of a YTF.
Owner:南京南环自动化技术有限公司

Magnetic loop of high-speed motor of electric vehicle

A magnetic loop of a high-speed motor of an electric vehicle is formed in an injection molding and mold pressing mode by sleeving a mold with a magnetic ring. The magnetic loop is characterized in that an inner hole is formed in the magnetic loop, a salient pole pin is manufactured in the inner hole, the inner hole is matched with a motor shaft, the salient pole pin is limited by a motor shaft pin groove, the magnetic ring is located on the radial peripheral wall of the magnetic loop, two end faces of the radial outside of the magnetic ring are provided with steps, the edges of the steps are covered with plastic, and the steps are used for straight limiting; at least one salient pole pin body is arranged on the inner diameter portion of the magnetic ring and used for circumferential limiting of the magnetic ring, and 180-degree line-connection alignment is carried out on the salient pole pin bodies and the salient pole pin of the inner hole with the circle center of the inner hole as the center; a fan is arranged at the joint of the inner hole and an outer ring and used for heat dissipation of the motor, the magnetic loop is straightly aligned with a Hall ring in a balanced mode when assembled and installed, and the magnetic loop shows the angle and position of a Hall element through rotation of the motor shaft.
Owner:金碧波

In-situ quasi synchronous detection method for detecting physicochemical properties of micro and nano structures

The invention relates to a method for detecting physicochemical properties of micro and nano structures on the surface of a material, in particular to an in-situ quasi synchronous detection method for detecting physicochemical properties of micro and nano structures by adopting an atomic force microscope-ion migration spectrometer (AFM-IMS) or atomic force microscope-high-field asymmetric waveform ion mobility spectrometer (AFM-FAIMS) combined technology under the atmospheric environment. The method comprises the following steps of: scanning and imaging a detected sample on an atomic force microscope (AFM) to acquire physical property data, desorbing the chemical substances of the sample by using corona discharge, ionizing the chemical substances into charged ions, sending the charged ions to an ion migration spectrometer (IMS) or a high-field asymmetric waveform ion mobility spectrometer (FAIMS) in a mode of migrating the electric field or using artificial airflow by using a micro electromechanical interface device, performing separation and detection, and determining the chemical components. The method can directly correspondingly analyze the physical properties of the sample and the chemical components, and has in-situ (quasi) synchronous fixed point analysis function of the micro and nano structures; and the whole process is performed under the atmospheric environment, themethod has low limit on the sample, the analysis efficiency and the test efficiency are greatly improved, the operation is convenient and flexible, the volume cost is low, and the method is convenient for popularization and application in the field of material analysis and test.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Frequency converter harmonic suppression circuit

The invention discloses a frequency converter harmonic suppression circuit, and belongs to the technical field of rectification circuits. The frequency converter harmonic suppression circuit comprisesa phase-shifting capacitor, a phase-shifting reactor, a first group of three-phase rectifier bridges, a second group of three-phase rectifier bridges, a first filter capacitor, a second filter capacitor and a boost contactor, three wire inlet ends of the alternating-current power supply of the first group of three-phase rectifier bridges are respectively connected to corresponding phase lines ofthe three-phase alternating-current power supply through three same phase-shifting capacitors; three wire inlet ends of the alternating-current power supply of the second group of three-phase rectifier bridges are respectively connected to corresponding phase lines of the three-phase alternating-current power supply through three same phase-shifting reactors; and the direct current output ends ofthe first group of three-phase rectifier bridges and the second group of three-phase rectifier bridges are connected in parallel to a frequency converter direct current bus. The frequency converter harmonic suppression circuit has the advantages of good filtering effect, convenience in installation, the small size, low cost and the like, and improves the low-voltage ride-through capability of thefrequency converter.
Owner:上海华电奉贤热电有限公司 +1

Microglass hemisphere resonant gyroscope and wafer-level fabrication method thereof

The invention discloses a micro-glass hemispherical resonator gyro and a wafer level preparation method thereof. The micro-glass hemispherical resonator gyro comprises a composite structure substrate; a glass hemispherical resonator; a silicon non-planar electrode embedded in the composite structure substrate; and a packaging glass shell cover; wherein the glass hemispherical resonator consists of a hemispherical shell and a self-aligned column, and the inner surface of the hemispherical shell and the surface of the self-aligned column are coated with a metal conductive layer which is led out by connecting with a silicon leading out channel through another metal layer; the silicon leading out channel and the silicon non-planar electrode are led out on the back of the composite structure substrate by a metal wire. The preparation method includes wafer-level preparing the micro-glass hemispherical resonator by using a thermal foaming process, wafer-level preparing a glass-type silicon non-planar electrode by using a hot reflux process, assembling the glass hemispherical resonator and the glass-type silicon non-planar electrode, and performing vacuum packaging. The hemispherical resonator prepared by the invention has a diameter of 1-10mm, and has high electrode resonator alignment accuracy at the same time.
Owner:SOUTHEAST UNIV

Impedance source type battery energy storage power electronic conversion device

The invention provides an impedance source type battery energy storage power electronic conversion device. The device comprises a battery energy storage unit, a bidirectional DC / AC converter, a filtering inductor, an impedance source network, a full-control type device and a control system; the positive pole of the battery energy storage unit is connected with the positive end of the bidirectional DC / AC converter; the negative end of the bidirectional DC / AC converter is connected with the input end of the impedance source network; the output end of the impedance source network is connected with the negative pole of the battery energy storage unit, and the other two ports of the impedance source network are connected with the full-control type device; and the bidirectional DC / AC converter outputs three-phase alternating current and is connected with a power grid through the filtering inductor. With the device of the invention adopted, voltage boosting and voltage reduction transformation is realized, and direct current-side input voltage can change in a wide range; and the upper full-control type power device and lower full-control type power device of the same bridge arm in the bidirectional DC / AC converter can be switched on simultaneously, and therefore, the reliability of the work of converter is high. Dead zones are not required to be added in modulation, so that output harmonic content is low. Compared with a traditional impedance source inverter, the device can achieve bidirectional energy flow and is smaller in capacitance and voltage stress under the same voltage boosting capacity.
Owner:CHINA ELECTRIC POWER RES INST +1
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