A new high - speed ert experiment system based on the bi - directional current pulse technique is designed and developed . on - line observation is realized for simulating gas / liquid two - phase flow using this experiment system 提出并研制成功了一种新型的基于双极性脉冲电流激励的高速电阻层析成像系统并实现了垂直管道的气液两相流的在线监测。
The effect of parameters such as preparing process of positive and negative electrode , capacity ratio of positive and negative electrode , electrolyte , sealant , etc . is studied . the basic processing parameters of bipolar ni / mh battery are specified 研究了正负电极制备工艺、容量配比、电解液、密封胶等参数对电池性能的影响,并且确定了双极性mh / ni电池制作的基本工艺参数。
In this paper , the bias - magnetic of ppfc and the parameters effect on the bias - magnetic are all studied . firstly , the bias - magnetic principle of ambipolar converter and some basic relations are analysed under two different conditions ( different von and different ton ) 首先在导致偏磁的两种情况下(管压降不同和导通时间不同)下,从理论上分析了双极性变换器变压器偏磁原理及基本关系。
The methods of determination bipolar inputting control signal , optic - electron coder feedback signal connecting with mcu , dimension ' s unity of inputting signal between feedback signal , zero position orientation , and logical drive are proposed and realized 提出并实现了系统双极性输入控制信号采样、编码器反馈信号与单片机接口、输入信号与反馈信号的量纲统一化、零位定位、以及逻辑驱动等处理方法。
Bipolar battery has the following advantages : compact structure , high energy density and high power density . it can better meet the requirement of hybrid electric vehicles . in this thesis , we focus on the problems that appear during battery design and manufacture 双极性mh / ni电池是一种具有叠层结构的新型电池,这种电池内部没有专用连接体,具有结构紧凑、比能量高、比功率高等优点,因而更适合于混合动力车的使用。
Abstract : a vertical sandwich deep trench with a field limiting ring is proposed to improve the breakdown voltage of power devices and high voltage devices . simulation result shows that nearly 100 breakdown voltage of the plane junction can be realized 文摘:提出一种二氧化硅/多晶硅/二氧化硅夹心深槽场限制环新结构来提高晶体管的击穿电压.模拟结果显示,该结构可以使射频功率双极性晶体管的击穿电压几乎100达到平行平面结的理想值
This paper simulates and analyses the torque pulsation because of the modulation frequency and speed variation under ambipolar pulse width modulation ; the influence of snubber circuit , dead time effects , and modulation frequency to igbt pwm inverterbridge is taken into account , too 本文对双极性调制的无刷直流电动机仿真，分析了转速和调制频率对转矩影响；并综合考虑缓冲电路、控制死区及载波频率对pwm逆变电路中igbt开关损耗的影响。
The characteristics of the full bridge series resonant converter with the separate transformer are analyzed . the resonant frequency and other circuit characteristics are discussed . the full bridge series resonant converter is analyzed by circuit simulation 对带可分离变压器的全桥串联谐振变换器的电路特性进行了分析,分析了变换器的谐振频率,利用正弦等效的方法分析了变换器的电路特性,对双极性控制和移相控制全桥串联谐振变换器进行了电路仿真。
Digital control has been becoming one direction of modern power electronics development . first , three modes of spwm modulation were introduced in the paper , including bi - polarity spwm modulation , uni - polarity spwm modulation and double - frequency uni - polarity spwm modulation . after comparing , double - frequency uni - polarity spwm modulation is used in the paper 首先,本文介绍了三种经典的spwm调制方式,包括双极性spwm调制法,单极性spwm调制法,倍频单极性spwm调制法,通过比较最终选择了倍频单极性spwm调制法作为本文所研究逆变器的调制方式。
Abstract : to against the fact of the commercial available white noise generators are very expensive which is not good for general operations , a simple and effective limited band white noise generator is design . the generator is using the feature of dual polarity transistor , i . e . , the power spectrurn density of particulate noise is not related to frequency in very wide band and close to white noise . the concrete circuit is also given 文摘:针对市售白噪声发生器价格昂贵，不利于一般场合使用的问题，介绍利用双极性晶体管散粒噪声功率谱密度在非常宽的范围内与频率无关，属白噪声这一特性，设计了一种简捷、有效的限带白噪声发生器，并给出了具体电路。
