The linear optical coupling has a wide range in industrial applications,with its good electromagnetic isolation function and linearity,but there is no special equipment to measure the special curve which is to show the linear optical coupling output character.The linear optical coupling and transistors have the same circuit model of the flow control current source,then using this principle,the linear optical coupling with four-terminal components is connected to the three-terminal components which are corresponding to the transistors,the output curve of the linear optical coupling can be measured by the transistor chart equipment.The good measuring result is presented in this paper.

Light-emitting diode (LED) is an ideal energy-efficient lighting source. Because of its unique light-emitting principle, LED needs constant current power source driver. The drive circuit to a large extent determines the efficiency of the energy efficiency of LED lighting. This paper analyses the efficiency of PCC BUCK circuit of LED lighting driver using simulation and experimental method, as well as compares the energy consumption of the various parts of the circuit. Following analysis, this paper gives specific measures to improve the drive efficiency.

The model of energy recycling DC electronic load based on power electronics converter was presented in this paper.The designed electronic load was used for low-voltage,high-current power supply testing.The stability of the mathematical model was analyzed using Routh criterion.The simulation model was created in Matlab/Simulink,and the constant control of input current was realized by S-function.According to different DC bus capacitance,the simulation result verified the correctness and feasibility of the proposed model,and provided a reference and basis for designing the electronic load system.

The adaptive second-order band-pass filters is constituted with a switch capacitance filter and phase lock loop constitute,using phase lock loop principle to provide the clock signal to the switch capacitance filter,make center frequency of the band-pass filters follow the input signal frequency variation,overcome traditional band-pass filter to change the shortcomings of center frequency.Experimental results show that the device can realize the function with adaptive tracking input signal frequency,and can be applied in the teaching and scientific research of periodic signal decomposition.

Research-oriented experiments are designed to the cultivation of students' application knowledge and allocate knowledge.Through the introduction of several research-oriented experiments often used in research methods,the observation method,the imitate method,the method of duality,the combining method and transplantation method can strengthen students' autonomy before completing the research-oriented experiments,enabling them to apply these methods to design more innovative experiments.

With the consideration of fusion and mutualism,this paper summarizes some reform measures that are adopted in construction of the open experimental environment,such as the structure layout,the experiment contents,the construction of the teaching group,etc.The reform can further boost the sustainable development of the open experimental environment under mutual-benefit and win-win guidelines.

The research-oriented experiments are the important course contents which develop student's innovating research ability.There are many differences between traditional and existing ideas in the teaching goal,the teaching model,the teaching environment,the teaching method and the evaluating way.The discussion of these ideas not only is advantageous to the development of these experiments,but also can promote the standardization and the routinizations.

It's necessary to store a mass of data with high-speed in many cases when using embedded systems,for example,high-resolution inspection system for oil gas transmission pipelines.Normal data bus and flash memory is difficult to meet the requirements.To solve the problem,this article introduces a design of data store system based on SATA connection,controlled by high speed DSP and using FlashDisk as store medium.The storage speed can reach 32 Mbit / s and storage capacity is up to 120 GByte.This design solves the problem of a large number of data fast storage in embedded systems very well.

给出了采用集成芯片SG3525和IR2110设计脉宽调制功率放大器的电路设计方法,针对芯片特点给出了合理的外围电路。同时根据功率管的模型,分析了电路中可能存在的干扰以及应采取的措施。最后给出了用MSP430单片机对系统进行监控和保护的具体电路。

This article mainly introduce the hardware system and arithmetic designing of Power factor meas- ure system based on MSP430F149.This designing would do low wave filtering and DFT process,so as to estimate the frequency of the signal..Therefor the system can change it's sample cycle according the signal frequency. The system uses PC screen to show the result momentarily though RS232 serial communication as well as using LCD.The interface is very friendly.

A new method based on dual slop integrating was introduced in the phase difference measurement.The theory and error were analyzed.The new method was applicable in the phase difference measurement of medium and high frequency signals.

The design and primary study of vanadium battery were introduced.The vanadium battery with carbon-silicon rod as electrodes was designed and the design was simple,pratical,and low cost. The electrolyte was prepared by based academic analysis. The time of electrolyzing vanadium battery and the time of electricizing it by constant current were calculated. The results of experiments show that the battery works well,the elecrtolyte can accord with the demand of the experiments,and the test time of electolyzing vanadium battery and electricizing is nearly equal with that of calculating. After a number of experiment periods,the anode is eroded a bit.

With the development of electrical and electronic technology,better and better frequency synthesizers are needed.This leads to continuous development of frequency synthesis technology.The three eras of frequency synthesis technology after the foundation of frequency synthesis theory are introduced.

Combining with the demanding of establishing the high-class college in the world and culturing the research talents with innovation,this paper introduces that the experimental course of circuit theory is transformed from the single validating course to all-round experiment of open and designing.The contents and implementing process of all-round experiment of open and designing in circuit theory is expounded in detail,and the feature of open and design about this experiment is discussed.

Direct digital frequency synthesis(DDFS)is an advanced technique for frequency synthesis. By means of this technique, the signal frequency can be controlled with facility, accuracy, continuous phase and fine frequency resolution. The double channel arbitrary wave generator based on direct digital frequency synthesis is introduced.

为了在生成物理样机前获取高速公路清扫车清扫效果的特性,应用计算流体力学(CFD)技术,实现了对高速公路清扫车气路系统流场的仿真分析.基于有限容积方法采用了非结构网格和k-(湍流模型,给出了气路系统流场的仿真模型和典型气路系统的优化设计,如改变吸盘的水平截面形状,改变料箱的隔板形状和位置,并对优化设计下的CFD仿真结果进行了详细深入的讨论,分析了吸尘系统、除尘系统的设计优化以及二者的相互影响.研究表明利用CFD技术结合具体工程对流场进行仿真,能够有效的对清扫车虚拟样机气路系统进行优化分析.

目前的虚拟仪器系统开发多以美国NI公司LabView和LabWindows/CVI为开发平台和数据采集卡.这里介绍的一个主从式虚拟仪器系统,其软件和硬件都摆脱了NI开发环境的限制,具有更大的开放性和扩展空间.该系统利用基于单片机的数据采集器,通过RS-232串口与PC进行信息传送,插拔方便.安装在PC机中的数据处理软件对数据进行处理和分析.用户可以通过主机的虚拟面板对数据采集器进行控制.

利用FFT变换进行谐波分析,非整周期采样会带来较大的误差.传统的解决方法是采用频率跟踪技术实现采样的整周期性.提出了一种新的解决方法,有效的利用计算机的计算能力,用数值计算的方法极大地节省硬件的开销.在虚拟仪器软件开发过程中使用,证明了该方法的可靠性.

目前的虚拟仪器系统大多采用美国NI公司LibView平台,采用PCI总线结构的数据采集卡进行数据采集.主从式虚拟仪器技术在软件和硬件都摆脱了IabView的框套.该技术利用基于单片机的数据采集器进行A/D转换和预处理,通过RS-232串行口与主机进行信息传送,插拔方便.主机通过数据处理软件对数据进行处理和分析.用户可以通过主机的软件界面对单片机(从机)进行控制,使之能按照不同的要求对信号进行数据采集和处理.

本文介绍了一种简便的相位超前滞后指示仪，介绍了它的原理、硬件结构，分析了它的一些主要特性。在对同频的交流信号的超滞相关的测定中，（如在对工频三相交流电网的相序的测定中），这种相位超前滞后指示仪充分体现了它简单方便的优点。