715results about How to "Solve loss" patented technology

The invention relates to a digital control device and method for an LLC (logical link control) synchronously-rectified resonant converter. The device comprises a digital signal processor, a primary high-frequency driving circuit, a current sampling detection circuit, a voltage sampling detection circuit and a secondary high-frequency driving circuit, wherein the digital signal processor judges an operation area of a circuit according to an output voltage fed back by the voltage sampling detection circuit, after the circuit performs three-pole two-zero compensation, the values of an on-chip period register are respectively changed so as to generate high-frequency driving signals which are then output to the primary and secondary high-frequency driving circuits by the digital signal processor; the current sampling detection circuit detects a secondary output current which is then output to the digital signal processor, then the digital signal processor judges whether an overloading or overcurrent phenomenon (generated in the process of area switching) occurs according to the size of the current so as to cut off the primary and secondary high-frequency driving circuits in time. In the invention, the LLC resonant converter is subjected to the following digital control by a digital signal processing chip-peripheral timer combined circuit: the advanced conduction of secondary synchronous rectifying tubes is realized by the design of software/hardware auxiliary circuits, and the control on secondary driving signals is performed by adding a 555 timer, so the application of a timer in a DSP (digital signal processing) chip is reduced, thereby effectively solving the problem of conduction loss of synchronous rectifying tubes introduced in the process of underloading in the traditional control strategy; and the application of a PWM (pulse-width modulation) port of the digital signal processing chip is reduced, thereby improving the reliability of the whole device.

The invention discloses an audio processing method for a bone conduction headset, the bone conduction headset and an audio playback device based on the bone conduction headset. The bone conduction headset comprises a human bone and tissue model modeling module, a digital pre-corrector, a delay estimation unit, a digital-to-analog converter, an analog-digital converter, a first low-pass filter, a second low-pass filter, an audio amplifier, an audio driving amplifier, at least one bone conduction microphone, and at least one bone conduction vibrator. In the method, human bone and tissue attenuation effect information of different users is detected in real time; a compensating transfer function is generated based on the attenuation effect information; and an input audio signal is subjected to digital pre-correction via the compensating transfer function, and then the processed input audio signal is transmitted in human bones and tissues. Through adoption of the method, a problem that experience of the bone conduction headset is different caused by different tissue thickness of the different users is solved.

The invention discloses an uninterrupted power supply system, which comprises a main power supply, a bypass power supply, at least two power modules, at least one battery pack, a monitoring module, a manual maintenance switch, an output switch, wherein the power modules are connected in parallel and connected to a load through the output switch; the bypass power supply is connected to the load through the manual maintenance switch. The invention reduces consumption and cost of the system, and reduces failure rate of the system.

The invention relates to an active left-handed transmission line formed by a lumped element and a diode and belongs to the technical field of microwaves. The transmission line comprises an SMA (Shape Memory Alloy) joint and micro-strip lines and is formed in a mode that N stages of units are cascaded. Each active left-handed transmission line unit consists of a series chip capacitor, a radio frequency choke inductor, a bias voltage, a negative differential resistance diode, a parallel chip inductor, a metal through hole, a dielectric substrate and a metal earth plate. The active left-handed transmission line units are connected through the micro-strip lines. An anode of each bias voltage is connected with a metal wire on the top layer of the joint of the corresponding micro-strip line and a cathode of the bias voltage is connected with the corresponding metal earth plate on the bottom layer of the micro-strip line. Each bias voltage is connected with a radio frequency signal transmission part of the active left-handed transmission line through the corresponding radio frequency choke inductor. The active left-handed transmission line not only has the characteristics that the active left-handed transmission line has the advantages of wide band, small size and simple structure, is easy to match and is easy for circuit integration, but also has the characteristic of net gain, i.e. transmission amplification, and can be applied to design of an antenna, a filter, a power divider, a phase shifter, a directional coupler, an amplifier, a sub-wavelength resonator, a perfect lens and the like.

The invention discloses a formation method of two-color or multi-color jacquard warp knitting cloth. The warp knitting cloth is knitted on a jacquard warp knitting machine. The formation method comprises the following steps that (1) jacquard patterns are designed by the adoption of a computer; (2) knitting is prepared; (3) parameters are input to the jacquard warp knitting machine, knitting is achieved through the machine, and the warp knitting cloth with preset patterns is obtained. The knitted warp knitting cloth can be of two colors or multiple colors, yarns in each color independently form jacquard and other patterns, the appearance is attractive, and the problems of cost and loss increasing, environmental protection, the physical property, quality and the like caused by the fact that the two colors or the multiple colors of the warp knitting cloth is obtained by the adoption of post processing are resolved. Meanwhile, more than seven yarn guide bars are adopted to knit, the formed warp knitting cloth not only has the function of irregular pattern jacquard but also displays different colors of different patterns, patterns of a cloth cover of the warp knitting cloth are complex and changeable, the different colors are mutually combined to form the cloth cover with distinct levels and distinguished in flexibility.

The invention relates to an emergency traction system applied to urban mass transit. The system comprises a power supply network, an auxiliary system of an urban mass vehicle, a main traction invertor, a traction motor, a power conversion device, an energy storage component and a master controller; the output end of the power supply network is connected with the power conversion device, the main traction invertor and the auxiliary system of the urban mass vehicle respectively; one end of the energy storage component is connected with the high-voltage side of the power supply network, and one end of the energy storage component is connected with the power supply network; the high-voltage side of the power conversion device is connected with the main traction invertor and the auxiliary system of the urban mass vehicle, and the low-voltage side of the power conversion device is connected with the energy storage component; and the traction motor is connected with the output end of the main traction invertor, and drives a train to run; and the power supply network, the auxiliary system of the urban mass vehicle, the main traction invertor, the traction motor, the power conversion device and the energy storage component are connected with the master controller through a communication bus. The system is suitable for high voltage grades, has a smaller volume and long service life, is high in reliability, and wide in an application range, and can be controlled flexibly, the traction load and distance are larger; and time of return on investment is short.

The invention discloses a method for extracting blueberry anthocyanin. The method comprising the following steps of: (1) pretreating raw materials; (2) extracting blueberry anthocyanin to obtain a blueberry anthocyanin crude extraction solution; and (3) refining the blueberry anthocyanin, and performing vacuum concentration on the blueberry anthocyanin until the content of the blueberry anthocyanin is 50% to obtain a finished product of a blueberry anthocyanin concentrated solution. According to the method for extracting the blueberry anthocyanin, the problems of low concentration of a blueberry anthocyanin extract and higher loss of the blueberry anthocyanin during extraction can be solved, and the defects of large solvent usage amount, long extraction time and high production cost of the existing extraction method can be overcome, so that the method disclosed by the invention is beneficial for environmental protection, energy conservation and development of cyclic economy, and has very significant economic and social benefits.

The invention relates to a digital microwave transmission device and a digital microwave transmission method. The device comprises a main unit and a remote unit which are arranged at each station. The main unit and the remote unit at one station are connected through an optical fiber cable. Remote units between two stations are wirelessly connected. Each main unit comprises an interface processing unit, a main transmission link, a main receiving link, a main wavelength division unit and a remote control unit. Each remote unit comprises a remote wavelength division unit, a remote transmission link, a remote receiving link, a duplexer unit and an antenna unit. The main unit adopts digital modulation-demodulation and shaping filtering to convert user digital signals into optical signals which are transmitted through optical fibers. After the optical signals reach the remote unit, the optical signals are restored to radio-frequency signals which are converted into wireless signals through power amplification for transmission. The device provided by the invention has the advantages that the transmission distance is long, the cost is low, the main functions are completed on the main units, the power consumption of the remote units is low, and the problems that the transmission through optical fibers at complex terrains is inconvenient to realize and the loss of long-distance wireless transmission is great are solved.

The invention belongs to the technical field of white spirit ageing, in particular to white spirit ageing process and device thereof, solving the problems of long aging time, large spirit consumption and the like of the traditional white spirit ageing. The device comprises an ageing device, wherein the ageing device is internally provided with a rotating padding and a guide cylinder, the guide cylinder is internally provided with a liquid lifting device, a liquid outlet and a gas outlet as well as a liquid inlet and a liquid outlet are arranged on a shell, the liquid inlet is connected with a closed vessel, the gas inlet is connected with an oxidizing gas source, and the liquid outlet is connected with a spirit storage vessel. The process comprises the following steps: sending green spirit into the ageing device; introducing an oxidizing gas, processing for 3-5min; then discharging the gas; introducing the oxidizing gas, processing for 10-60min; and sending the aged white spirit into the spirit storage vessel. The white spirit aged by the invention has mellow, soft taste and basically unchangeable processed alcoholic strength; and the content of effective components in the white spirit is equal to that of the years-aged white spirit, and the white spirit is processed for 10-60min, and the effect of the processed white spirit is equivalent to that of a 1-3 years naturally aged white spirit.

The invention discloses a driving control system and a control method thereof based on a dual-power supply open-type winding permanent magnet synchronous motor. An open-type winding permanent magnet synchronous motor structure with dual power supplies and dual inverters for power supply is adopted, an electronic switch group is added, a delta winding connection is realized, the structure can be used for a dual-power supply structure of different power types, and voltage of two power supplies can be allowed to be different and change in real time. through torque saturation determination and rotation speed threshold control, automatic switching is realized among a star winding mode, a delta winding mode and a dual-inverter common control mode, and switching loss is reduced. A dual-inverter current hysteresis control algorithm in a low switching frequency mode and a large power differential mode is provided for the dual-inverter common control mode, and effects of realizing multi-level control and providing different dual-power supply energy allocation can be realized.

The invention discloses a Linux system-based serial RapidIo data transmission method. By utilizing a few quantity of DMA (direct memory access) controller resources, adopting a DMA linked list mode and mapping a register space of a DMA controller to an FPGA (field programmable gate array), the [CC]bit of the FPGA is realized by writing a DMA mode register MRn of a CPU (central processing unit), so as to start the DMA linked list transmission and initialize the data transmission of a rapidio link; during the whole data transmission process, the CPU does not need to join no matter in writing the DMA resister, transferring DMA data or the last rapidio link data transmission, so that the CPU efficiency is greatly improved; and the data transmission is realized in accordance with time sequence demands strictly, so that the dilemma of performance reduction caused by the fact that the time sequence is realized through interruption and the interruption is responded constantly; the mapping of an internal-core space address to a user space address is realized through a uio technique, so that the internal-core space address can be directly operated at the user space, and the data copy at the user space and the internal-core space is avoided; and moreover DMA linked list nodes can be designed so as to realize the flexible control in data transmission of a rapidio link output window.

The invention discloses a mixed induction type active electric power filter system. The mixed induction type active electric power filter system comprises a rectifier transformer, a filtering branch, a rectifier and the other filtering branch, wherein the other filtering branch comprises three passive filters and a voltage source inverter, the passive filters are connected to the voltage source inverter, the primary side of the rectifier transformer is connected to a three-phase power grid through connecting impedor, an epitaxy winding of the secondary side of the rectifier transformer is connected with the rectifier, and the passive filters are connected to three junction points between a delta winding and the epitaxy winding of the secondary side of the rectifier transformer in parallel respectively. According to the mixed induction type active electric power filter system, influence of frequency fluctuation of the power grid side and the high-capacity nonlinear load side on electric power filtering performance is eliminated; meanwhile, the problems that serious harmonic pollution, high additional loss of a master device, high vibration and noise, low system power factor and low system operation efficiency are caused by harmonic waves and idle work to an industrial power distribution and consumption system are effectively solved on the premise that electric power quality on the power grid side meets the national standard of China.

The invention relates to a digital control device and method of an LLC (Logic Link Control) synchronous rectification resonant converter. The digital control device comprises a digital signal processor, a primary side high-frequency drive circuit, a current sampling detection circuit, a voltage sampling detection circuit and a secondary side high-frequency drive circuit. The digital control method comprises the step of: carrying out digital control on the LLC resonant converter by using a digital signal processing chip: when in light load, a secondary side synchronizing rectifier tube is switched on in advance, the problem of conduction loss of the synchronizing rectifier tube, caused by introducing a light load by the traditional control strategy, is effectively solved; and when in heavy load, a secondary side drive signal is immediately switched off according to circuit parameters, and an overcurrent protection circuit is designed for monitoring output overcurrent caused by smaller equivalent impedance when a working region is switched.

The invention discloses a low-dielectric LTCC green tape as well as a preparation method and use thereof. The low-dielectric LTCC green tape is composed of a powder, a solvent, a dispersing agent, a binder and a plasticizer, wherein the powder is in a mass fraction of 40-60%, and prepared from 10-40wt% of a glass material, 1-10wt% of a low melting point oxide sintering aid and the balance of a ceramic material; the chemical composition of the ceramic material is Zn2-xSiO4-x, where x=0.05-0.3. In the present invention, the problem of low-temperature sintering ofZn2-xSiO4-x ceramic is solved byadding the crystallizable glass material and the sintering aid together, and the mechanical properties and the high-frequency electrical characteristics of the system can be improved.

The invention provides an optical fiber laser outputting head, which comprises an outputting optical fiber, an end cap, an optical fiber guide sleeve and a guide sleeve fixing seat. The end cap is arranged on the tail end of the outputting optical fiber and is used for carrying out optimization treatment on output of the outputting optical fiber; the optical fiber guide sleeve is used for guiding the outputting optical fiber, and the outside end surface of the optical fiber guide sleeve is aligned with or slightly higher than the outside end surface of the end cap; the guide sleeve fixing seat is used for fixing the optical fiber guide sleeve, and a first fixing structure for movably fixing the outputting optical fiber is arranged on the guide sleeve fixing seat. By adopting the optical fiber laser outputting head, the fixed cooling on the outputting optical fiber is realized according to the matching structure of the end cap and the optical fiber guide sleeve, the isolation degree of the optical fiber laser outputting head is promoted, the loss of the optical fiber laser outputting head is reduced, and meanwhile the maintenance cost of the optical fiber laser outputting head is lower.

The invention is applicable to the technical field of inverters and provides a grid-connected inverter which comprises a direct current power supply, a storing module which is connected with the direct current power supply, an inversion module which is connected with the storing module, an output module which is connected with the inversion module and a grid respectively and a continuing current circuit which is connected with the inversion module and the output module respectively. In the invention, on the basis of a traditional single-phase full-bridge grid-connected inverter, the grid-connected inverter introduces the continuing current circuit and is matched with a corresponding modulation mode, thus solving the existing problems of the traditional single-phase full-bridge grid-connected inverter when adopting double-polarity modulation and single-polarity modulation and increasing the inversion efficiency and the electromagnetic compatibility of the inverter effectively.

The invention provides a wireless terminal performance test method and a wireless terminal performance test device. According to the method, a performance test on an LTE-V2X terminal under an anechoicchamber environment is achieved. Firstly, a test system including an anechoic chamber, and first test equipment, a sending end, a channel simulator, an adjustable attenuator, a receiving end and second test equipment connected in sequence along a signal transmission direction in the anechoic chamber is built. When a test is performed, a signal propagation path loss value under a scene is determined according to channel models corresponding to the different scenes, when a signal propagation path loss value can be simulated by the channel simulator cannot reach the signal propagation path lossvalue needed by the scene, the actual signal propagation path loss value under the scene is simulated by the sum of the signal propagation path loss value of the channel simulator and an attenuation value of the adjustable attenuator, a simulated path loss range is increased, and the problem that when a performance test is performed in a laboratory, the channel simulator cannot simulate the signalpropagation path losses under all the scenes is solved.

The invention discloses a control method of a high-stability heat pump system. The control method comprises the following steps that main valve control parameters are detected, and the opening degreeof a main electronic expansion valve is adjusted according to the main valve control parameters; auxiliary valve control parameters are detected, and the opening degree of an auxiliary electronic expansion valve is adjusted according to the auxiliary valve control parameters; and compressor control parameters are detected, and stopping of a compressor is controlled according to the compressor control parameters. According to the control method, the opening degrees of the related expansion valves and stopping of the compressor in the heat pump system can be controlled, then the flow of a refrigerant fluid is adjusted so that the compressor is prevented from running in a dangerous state, and the problems that the heat pump system is unstable in heating effect and the compressor is lost can be solved.

The invention discloses a fire fighting device intelligent tour inspection system and method based on internet of things GIS; the system includes a system management platform, a database server, an RFID label, a hydraulic pressure sensor for reading the hydraulic pressure of a fire hydrant, a read head, an android intelligent mobile phone as a bluetooth-communication signal converter, and a mobile terminal intelligent tour inspection subsystem; the mobile terminal intelligent tour inspection subsystem includes a registration module, a tour inspection module, and a map checking module; the hydraulic pressure sensor and the RFID label are both mounted in a fire fighting device; the hydraulic pressure sensor reads a hydraulic pressure value, and then the value is transmitted to the read head; the RFID label transmits a label ID value to the read head; the hydraulic pressure and the ID are in one-to-one correspondence in the read head, then are read through the android intelligent mobile phone, are transmitted to the system management platform, and are saved in the database server; the mobile terminal intelligent tour inspection subsystem can inquire a latest tour inspection result from the system management platform in real time, and the latest tour inspection result is displayed on a map. The system and the method effectively improve the scientificity and effectiveness of the management.

The present invention provides a charging control circuit which can compensate the charging for battery with lower voltage in series battery set during charging and enables the terminal voltage of independent battery in series battery set to tend to uniform. The charging control circuit can detect the terminal voltage of the independent battery in series battery set in real time during charging and compensate charging for the battery with lower terminal voltages through a compensation charging circuit, thereby making up the differences of the initial state and the charging/discharging characteristics for independent battery in the battery set, unleashing the loading capability of the independent battery while making sure the independent battery has no over-charging and improving charging and discharging efficacy of the power battery.

The invention provides a firewall based on a DPDK virtualization management system and an implementation method thereof. According to the invention, interruption is intercepted by using a DPDK pollingtechnology; according to the working principle that the UIO technology bypasses the kernel protocol stack and the message received by the network card is mapped to the user mode protocol stack f-stack through the UIO technology, the performance consumption during data packet capture is greatly reduced, and the data packet processing performance of the firewall is improved. A quick forwarding pathis added before a data packet enters an f-stack protocol stack; according to the method, session check is carried out on the data packet captured by the DPDK, and the flow of which the session is established is directly forwarded from the recorded port, so that the performance loss of the data packet in the process of passing through the protocol stack is reduced, the packet forwarding rate is improved, and the data processing performance of the firewall of the virtualization management system is further improved.

The invention requests for protecting a method for safely optimizing a physical layer in a multi-relay cognitive radio network, and relates to the technical field of cognitive wireless communication systems. For a scene that multiple mutually colluded wiretapping nodes exist in the multi-relay cognitive radio network, the invention provides a safe transmission scheme of a zero-space artificial noise and amplified forwarding (AF) relay beam forming physical layer. Firstly, a system is modelled, and designed into a secrecy rate maximization problem; secondly, due to introduction of a slack variable, the fact that the secrecy rate maximization problem can be converted into the tight and slack problem is proved theoretically; furthermore, joint optimization solution of a relay beam forming weighting matrix and an artificial noise covariance matrix is carried out by utilizing a semi-definite programming method; and finally, due to MATLAB simulative verification and analysis, the secrecy rate of the system can be increased to a great degree.

The invention provides a backboard device and a communication device. The backboard device comprises a line card arranged on one side of the backboard device with a switch board and vertical to the switch board; the switch board arranged to be orthogonal to a plurality of backboards; the plurality of backboards arranged on the other side of the backboard device and arranged to be parallel to the line card, wherein the line card and the switch board are in high speed signal connection through the plurality of backboards. By adoption of the backboard device, the problems of high high-speed channel insertion loss, high cost, depth requirements meeting difficulty, poor heat dissipation and constraint system bandwidth volume scale of the backboard framework system in related art are solved.

The invention provides a method and equipment for establishing a GRE channel. The method comprises the steps of transmitting a GRE channel establishing request message by HG to an HAAP, wherein the GRE channel establishing request message comprises a first IP address which is the IP address of WAN of the HG; receiving a GRE channel establishing request response message by the HG, wherein the GRE channel establishing request response message is transmitted by the HAAP, the GRE channel establishing request response message comprises a second IP address which is the source IP address of the GRE channel establishing request message that is received by the HAAP; and establishing the GRE channel between the HG and the HAAP by the HG according to the GRE channel establishing request message, and determining whether network address translation (NAT) is performed in the establishing process of the GRE channel between the HG and the HAAP according to the first IP address and the second IP address. Therefore the method of the invention reduces unnecessary network overhead caused by compulsory adding of UDP message head in a subsequently transmitted data message through NAT in a GRE channel establishing process.

A technology combining magnetic field with electrospark for machining the magnetically nonconductive metallic material includes such steps as designing the magnetic supply unit of electromagnet, connected to the electrode terminals of electrospark machine, debugging and installing, connecting the workpiece to be machined with the positive electrode of pulse power supply, connecting the machining tool to its negative electrode, supplying the running water as its working liquid, optimizing technological parameters, measuring the machining speed and surface roughness, and observing the chip discharging state.