The content of this theme is as follows : without time , without open , without stopping railway transport , and without interrupting traction current of block tested , meanwhile track circuit parameters in electrical and no electrical blocks is measured of on - line , dynamic and real - time . these parameters include voltage of fsk signal , voltage of industrial and harmonic wave interference , upper frequency , lower frequency , carrier frequency and low frequency 18 messages frequency 本课题研究内容:在不要点,不开天窗,不中断行车,不中断被测区段牵引电流的情况下,在线、动态、实时测量电化区段和非电化区段的移频信号电压、工频干扰电压,移频信号(调频信号)的上边频、下边频、载波频率、以及低频18信息频率等参数。
Principle of dc - dc flyback converter , technique of single - stage power - factor - correction and lead - acid battery charge are analyzed and studied . the steady principle of these ac / dc converters and the design criterions of key circuit parameter are analyzed in detail 对构成这类变换器的三大关键技术? ?反激dc - dc变换技术、单级功率因数校正技术和铅酸蓄电池充电技术进行了分析研究,详细论述了这类单级不间断高功率因数ac dc变换器的稳态工作原理和关键电路参数的设计准则。
The main research work include ( 1 ) introduces the gemal method and steps of asteroidal magneto design , especially the method and steps of electromagnetism compute , follow these steps , the design parameters such as relative structure dimensions , coil and magnetic circuit parameters can be obtained . this method is easy to use . this thesis also provides a series of experiential coef ficients for the mode 本文主要工作如下: ( 1 )本文指出了星形磁电机设计的一般步骤和方法,重点讨论了电磁计算的方法步骤,据此可以得出有关机械结构尺寸、绕组及磁路参数等设计参数;本文提出的磁路计算方法,简单适用;本文还提出了一系列关键参数规范化设计模型的经验系数。
And in microwave circuit design , the model can be used for the design of coplanar waveguides , transistors , transmission line , filters and amplifiers , etc . besides , after in microwave circuit optimization , a neural network model can be used to optimize circuit parameters and match the microwave impedances , etc . under this background , with the support of the project entitled " modeling of wireless nonlinear channel and analysis of its characteristics " of of uestc youth funddation , this dissertation is intended to develop some techniques for application of neural networks in the fields of nonlinear microwave circuit modeling and optimization . the main contributions of the dissertation are as following : 1 本文工作正是在这样的应用背景下,基于电子科技大学青年科技基金《无线非线性信道建模及特性分析方法研究》 ,对神经网络在非线性微波电路建模和优化中的应用,展开了一些研究工作,作者的主要贡献和创新如下: 1 )将神经网络应用于微波电路的时域非线性特性建模,通过分析了一个功率放大器的时域瞬态和稳态的非线性特性,并用hp - ads对其非线性特性进行了仿真,然后把其仿真输入和输出数据来训练神经网络。
The twelve kinds of modes and equivalent circuits of voltage mode ac - ac mode ac / ac converters with high frequency link within one high frequency switching period are carefully analyses . by using the state - space averaging approach , the converter ' s averaging model is presented , and the design criterion of key circuit parameters and the output characteristic curve are given 以全桥桥式拓扑为例,论述了单极性移相控制的原理、单极性移相控制电压源交?交型高频环节ac ac变换器在一个高频开关周期内的十二个工作模式及其等效电路。采用状态空间平均法建立了变换器平均模型,获得了关键电路参数的设计准则和变换器的外特性曲线。
Then summarize the merits and shortcomings of these hybrid pfc topologies . by combining these practical hybrid pfc circuits and the systematic method for deriving pfc , this paper bring up some new hybrid pfc circuits . in these new pfc circuits , this paper focuses on the circuit belong to topology i - iia , establish mathematics model , analyze the control method , and discuss the relationship between power spit and circuit parameters 结合这些已有的实际混合pfc电路和系统的推导pfc拓扑的方法,在本文中推出了一些新的混合pfc ,着重分析探讨了属于拓扑i - iia的电路,建立了相应的数学模型,分析其控制策略,并根据具体的电路分析了能量分流与电路参数的关系。
The topologies family include single four - quadrant power switch mode , push - pull mode , half - bridge mode , and full - bridge mode circuits . taking full - bridge mode circuit as an example , the operational mode , steady principles , transient voltage feedback control strategy of the converter are investigated . the output characteristic curve , the design for the key circuit parameters and the reference sinusoidal circuit which is synchronous with the signal of n or 1 / n times line voltage frequency are given 该电路拓扑族包括单四象限功率开关式、推挽式、半桥式、全桥式电路,以全桥式电路为例分析研究了这类换器工作模式、稳态原理与电压瞬时值反馈控制策略,给出了变换器的外特性曲线、关键电路参数、与电网电压n倍频或n分频信号同步的基准正弦电路的设计。
And then , the different demands of position detecting on different light source and different distance are discussed . the different effects of position detecting on different circuit parameters and different center - filter frequencies are compared experimentally . after analyzing the factors that influence the speed and the precision of position detecting , the paper put forward the improving measures 本文对不同环境光照和不同测试距离下的位置测量要求进行了探讨,对不同的电路匹配参数和不同滤波中心频率的位置测量结果进行了实验比较,认真分析了影响位置测量响应速度和精度的因素,提出了提高psd器件的抗杂光干扰能力和位置测量精度的措施。
Then , the theoretical analysis of the 3 - phase reversible rectifier circuit is performed in detail . after that a 1kw 3 - phase pwm rectifier is designed in theory and hi practical . in the third chapter , the computer simulation based on matlab is carried out through the simulation , a number of simulation data are gained for studying the relation between the circuit parameters and the reversible rectifier characteristics 首先对三相功率因数校正技术作了分析和比较,确定本课题研究的内容,指出其研究价值和意义;然后对三相高功率因数可逆整流电路作了理论分析,并在此基础上,对一个1kw的三相高功率因数可逆整流电路进行了理论设计;利用matlab软件,建立了计算机仿真模型,对系统的整流和逆变工作特性进行了仿真研究,得到了各电路参数和控制参数与系统性能之间的关系。