计算电路

The working process , the principle and the parameter calculation method of the Undeland buffer circuit .

分析了Undeland 缓冲电路的工作过程及原理，并介绍了缓冲电路参数计算方法，最后用仿真的方法验证了电路的缓冲效果。

First, the necessity of the filter capacitor was discussed, And then further theoretical analyses computing were made.

文章首先阐述了研究滤波电容选取的必要性，其次对电路进行了理论上的分析和计算，并根据理论计算结果编写程序，模拟电路的工作过程。

This paper uses a new method in which a intermediate variable is used to solve the problem of the controlled circuits. This method can make the calculation simpler.

本文介绍一种通过计算中间变量来求解含受控源电路的方法，这种方法可使含受控源电路的分析计算更加简便、灵活。

Circuit bandwidth may be calculated in the same manner as for the inverting amplifier, but input impedance is somewhat more complicated.

电路带宽的计算方式和反相电路相同。输入阻抗的计算方式相对复杂。

College of Electrical Engineering, Zhengzhou University摘要: In order to understand and calculate the reactive power of the nonsinusoidal electric circuit accurately and analyses the the influence of the reactive power in the nonsinusoidal electric circuit on reactive energy measurement .the calculation formula of the reactive power is concluded by means of the Fourier analysis method.

为了能够准确地理解和计算非正弦电路的无功功率，分析非正弦无功对无功电能计量的影响，本文采用傅立叶分析方法，导出非正弦电路的无功功率的计算公式，分析了公式中每一项的物理意义。

MATLAB language is used to develop the computer simulation program by means of the dynamic mathematical model of three - phase induction motors in phase quantities, The program is applied to series asymmetrical resistance starting operation process of three - phase cage - type induction motors in one phases or two phases of the stator circuit.

为了得到起动特性，根据三相异步电动机在相坐标系下的瞬态数学模型，编写计算机仿真程序，通过实例对三相笼型异步电动机的定子电路一相串联电阻以及两相串联电阻时的起动过程进行仿真计算，对仿真结果进行比较分析；用对称分量法分析定子电路一相串联电阻以及两相串联电阻时的不对称系统，初步计算起动电阻的数值，然后通过计算机仿真的调整来较准确地加以确定。

Through theoretic reckoning and simulating analyzing, several control strategies for shunt APF were compared and chose ip-iq arithmetic ofthe instantaneous reactive power theory control strategy as the right scheme to produce the instructing current. Based on it, some new control arithmetic was subjoined to suppress the resonance in system and balance the dc side capacitor voltage. Two topologies of main circuit were compared and chose the three-phase voltage-source converter with a split-capacitor as its main circuit structure. The numerical scales of the dc side capacitor and inductance of reactors were calculated. The high-pass filters were designed to eliminate effectively the highfrequency harmonics produced by APF.

通过理论计算和仿真分析，比较了并联型APF的几种控制策略的优点和缺点，从中选择瞬时无功理论控制策略i_p-i_q计算方式为指令电流产生的算法，并在此基础上增加了抑制系统谐振和平衡直流侧电容电压的控制；比较了并联型APF主电路的两种常见形式，从中选择了三相电压型变流器的主电路形式；算出适合该APF的直流侧电容和出线电感的参数；设计出能有效消除APF产生的高次谐波的高通滤波器。

Cuit model are derived. The model and the corresponding formulations facilitate leading the ladder type and the

等值电路模型，并推导了模型参数的计算公式，根据这些计算公式和多边形等值电路模型，可进一步推导出

By comparison and Fourier analysis of the waveshapes of the input current with different values of the inductor in the experiment, the valuable references are attained in the same type circuit design.

所以对电感值的计算就显得尤为必要。Boost型APFC电路中的升压电路部分不同于传统的Boost电路。传统Boost型电路的输入电压是直流电，在设计电感值时比较容易。

The hardware includes four parts: preposed circuit, sampling circuit, DSP circuit and display circuit. The software includes four parts: main program, FFT program, power algorithm program.

硬件分为四个部分，前置电路、采样电路、DSP电路和显示电路；软件也分四部分，分为主程序、采样子程序、FFT子程序和功率电能计算子程序。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。