Research and design of a solar charging system based on FPGA

In order to meet the special application requirements of photovoltaic power system for contamination monitoring system in high voltage transmission line, this paper presents a charging system suitable for fast charging of supercapacitor with low-power solar cells. This design uses BUCK-BOOST circuit as the main charging circuit topology, uses a novel MPPT tracking method, Weighted Variable-Step Voltage-Hysteresis Perturbation & Observation MPPT(WVV P&O MPPT), and achieves control by FPGA. The system’s configuration and control strategy are theoretically verified by Matlab/Simulink, and the production and testing of the charging system are completed. Test results show that the charging system uses low-power solar cells and charges 2F and 5F super capacitors under normal weather conditions, and all of these charging works can be finished during a relatively short time. Compared with the previous research of our task force, this design effectively reduces the charging time and improves the utilization of solar energy.     

Design of subretinal artificial chip based on standard CMOS technology

A chip with smaller size and higher pixel density was designed to increase the chip’s pixel density in subretinal prosthesis. This chip was designed on 0.35 μm standard CMOS(complementary metal oxide semiconductor) technology of CHRT company, while the double inverter relaxation oscillator was chosen as the basic pixel circuit. By creating layout on Cadence software, the circuit was debugged and simulated. The experiment results show that the pixel circuit provide effective pulse signals whose values and frequencies can vary with photocurrent to stimulate retinal nerve cells. For the simulated layout, the pulse width was 0.26 ms, the frequency was 18～503 Hz, the pixel size was 65 μm×65 μm, and the chip size was 1.1 mm×1.1 mm. All of the parameters can satisfy the requirement to stimulate retinal nerve cells in physiology. The experiment results provide a good foundation for the following research.     

基于FPGA的多路伺服电机的智能控制

采用基于FPGA(Field Programmable Gate Array)多路伺服电机的智能控制系统,利用FPGA的并行处理能力,同步控制多路伺服电机。该套系统运用了PID控制算法,实现多个叶片位置和速度的智能控制,完全满足叶片运动的控制要求,并给出较好的控制策略,具有较高的推广应用价值。     

基于LabVIEW的潜油电泵数据采集系统

应用LabVIEW虚拟仪器现场可编程门阵列(FPGA)对潜油电泵的电压、电流参量进行实时数据采集,通过上位机对采样数据进行分析处理,得到潜油电泵的视在功率、有功功率、无功功率和功率因数,并与电能质量检测仪检测数据进行对照。系统硬件采用NI sbRIO-9606和NI9683夹层板配合使用,突破了传统的依靠DAQ助手的硬件采集,基于现场可编程门阵列(FPGA)的数据采集系统,由软件构成采集功能芯片,可控性强,准确性高,应用性好。实验表明,该系统在误差允许范围内能够对数据进行准确采集。     

Application of Improved Fast-LADT Arithmetic Based on FPGA

This paper puts forward an improved fast-LADT arithmetic in application of electrocardiogram(ECG) compression.The arithmetic has much less mathematical operation and much easier to be implemented in hardware.With the artificial and experimental verification,it turns to be that the arithmetic keeps rather high compress ratio,has the advantages of small distortion and has the nicer results in real tine.The hardware system of ECG data compression is designed,implements the improved fast-LADT arithmetic,the experiment of ECG data compression also has been carried out,and the experiment results prove the validity of the arithmetic.     

Disign and Implementation of Speaker Recognition System Based on FPGA

Aiming at the shortcoming of low recognition and training speed in embedded speaker - recognition system based on DS Phard-core processor, a new scheme of system based on FPGA and vector quantization principle is presented. In the speaker-recognition system based on the vector quantization and generation algorithm, a fitness parallel process hardware structure is presented by the scheme which consumes much less time than software processing while getting the fitness. The test shows that the system uses this method obtains both high recognition rate and higher speed in training and recognition.     

Target pre-detection based on visual attention

An improved integration model combining the bottom-up and top-down cues for visual attention is proposed. It uses an integrated outline as the symbol for object recognition and overcomes the shortcomings of the top-down visual attention method     

Schedule of Two level Multi object based on Relatively Prior Weight

The default of conventional schedule is expounded, which only emphasizes on system's overall object but overlooks sub system's local object. A mathematical model of two level multi object is put forward. The concept of relatively prior weight is defined, and a heuristic algorithm is given out. The results of computer simulation show that the algorithm is effective.     

Realization of high speed transmission system of ICT based on USB 2.0

Aiming at solving the problems existing in the traditional data transmission system of Industrial Computerized Tomography (ICT), which usually uses PCI and ISA bus, resulting in high price, poor scalability, low transmission rate, complex fixing and complex routing, and cannot fulfill the demand for research and production, a set of ICT based USB 2.0 high speed data transmission system model is proposed. The system takes a FPGA chip as core logic control module, which controls communications with the USB chipset. The whole hardware designation is described in terms of the performance of reliable data transmission, high speed and stability. Experimental results show that the proposed method improves the system’〖KG*8〗s stability and reliability. It can satisfy the requirements of ICT transmission .     

Rear throttle Optimization based on the Hall element

A car rear throttle mounts on rear of the car,it works poor working conditions,Its waterproof, moisture-proof, shock-proof, dust-proof,reliable,longevous and other performance requirements can not meet the use requirements. Through research, a design scheme based on the Programming triaxial Hall element rear throttle is proposed. In view of the rear throttle performance requirements, chose the MELEXIS company’s MLX90316 dual output linear hall element,optimized the mechanical structure and anti-interference circuit of the rear throttle , calculated the data of spring. Made the rotating parts and sensor of the rear pedal independent of each other, no rotor connected to the rotating part in the sensor. The rear pedal’s various performance indicators meet the design requirements.     

考虑驾驶员视觉适应的公路隧道入口段亮度确定方法

驾驶员的视觉适应过程直接影响交通安全。为考虑驾驶员的视觉适应过程,在确定公路隧道入口段亮度时,通过实测得到驾驶员驾车进入隧道过程中的瞳孔大小变化数据,建立了描述驾驶员驾车进入隧道过程中瞳孔面积变化速率最大值与各相关参数之间关系的数学模型。以驾驶员不发生视觉障碍的瞳孔面积变化临界速率为基准,计算得到了驾驶员瞳孔面积变化达到临界速率时,隧道入口段的最低亮度,分析了隧道入口段所需最低亮度与洞外亮度之间的关系,通过回归分析建立了隧道入口段亮度与洞外亮度之间关系的数学模型,得到了考虑驾驶员视觉适应的公路隧道入口段亮度确定方法。     

Control strategy of regenerative braking for hybrid electric vehicle based on engine braking

Focusing on a continuously variable transmission(CVT) hybrid electric vehicle with integrate starter generator(ISG), modeling and simulating of engine braking was conducted. An optical control strategy of regenerative braking was put forward. When there is no regenerative braking, engine brake force can be used effectively by changing the CVT ratio to reduce the braking force requirements for wheel brakes based on the calculated results of engine braking. When there is regenerative braking, the braking priority sequence is generator braking, engine braking, and finally frictional braking. A forward simulation model for regenerative braking system of hybrid electric vehicle was built. The simulation and analysis under typical driving cycles was conducted. The result shows the control strategy and the models are reasonable and feasible.     

Nominal electric field calculation at the ground level of UHV DC transmission lines based on radial basis function method

Nominal electric field at ground level is one of the important factors for the design of transmission lines. FEM meets two big challenges in electromagnetic field computation. One comes from the mesh generation, which is a big difficulty especially in complex geometry. The other is the long time calculation. So the radial basis function method is introduced to calculate the nominal electric field at the ground level of UHVDC transmission lines. Not only the definition and ideas, but also the detailed implementation procedure of radial basis function method are presented. Computer programs are developed to simulate the model and the influences of conductor configuration on nominal electric field intensity are analyzed. Examples of calculation show that the results are accorded with those available literatures, and agreed satisfactorily with analytic solutions of the coaxial cable model. The height of the polar lines and conductor inter-spacing has a remarkable influence on ground nominal electric field intensity while the sub-conductor radius and number of sub-conductors have little influence.     

多尺度积角点检测和视觉颜色特征的鲁棒车牌定位算法

为解决生鲜产品配送过程中的质量控制问题,将质量功能展开(QFD)与计划-实施-检查-处理(PDCA)循环相结合,运用QFD获得生鲜产品配送质量控制的关键指标,针对关键控制指标,将PDCA循环模型运用到预防措施和纠偏措施的制定和持续改进中,为生鲜产品配送中的质量控制提供指导,从而保证生鲜产品的质量。     

Coordinated pressure control of a regenerative braking system based on a hybrid electric vehicle with an integrated startor and generator

With a focus on a Changan hybrid electric vehicle (HEV) with an integrated startor and generator (ISG), strategies for braking force distribution and coordinated pressure control are put forward, and a dynamic braking control model is constructed for off