查询词典 Ac

At last, 2KVA - experimental prototypes of AC power supplies of multiple-loop analog and digital control system have been made. Fast dynamic response and load compatibility have been verified by the experiment of step change in the load and under rated full-wave diode bridge rectifier load.

最后各研制了一台2KVA的多环模拟控制系统逆变电源实验样机和数字化控制系统逆变电源实验样机，切换负载实验和负载适应性实验分别验证了逆变电源系统具有良好的动态性能和负载适应性。

The article makes a comparison among different types of bus, bus transmission signal and several familiar topologies of front-end converters and load-end converters. Finally, the half bridge converter with full-wave rectifier based on the high-frequency parallel-type AC bus bar is chosen as circuit structure and optimized. The working mode under different condition of the circuit is analyzed and a mathematical model is set up under continuous current mode. Simulation result is used as comparison.

通过对比不同类型的母线、母线传输信号以及各种常见的前端变换器拓扑和负载变换器拓扑，确定了基于并联型高频交流母线的半桥变换器加全波整流作为电路拓扑，并优化了电路的结构，分析了基于不同工作状态下的电路结构并建立电流连续模式的数学模型，并与软件仿真结果进行对比。

The Full-Wave Rectifier and Averaging Filter 全波整流器和平均值滤波器: The circuit shown in Figure 25 is the heart of an average reading, rms calibrated AC voltmeter.

它由一个整流器和一个平均值滤波器构成。

The objective of the thesis is to present newly developed AC driver and protection circuits for light emitting diode. The LED modules for each upper and low arm are with pulse-width modulation control in every half fundamental cycle. The indication and protection circuits act whenever short circuit and open circuit of LED module occur. Moreover, the current path is switched off when there is a short circuit of LED module.

目前一般白光发光二极体的驱动器，皆是使用直流电源驱动，本文利用发光二极体本身单向导通的特性，将发光二极体串接成桥式整流器的方式，只需控制流经中间路径的电流周期，就可达到调整发光二极体亮度之目的，并且增加发光二极体故障时的保护指示电路。

A series ac voltage regulator based on a new fundamental positive sequence calculation method, which is utilized to generate the compensation voltage reference, is introduced in this paper.

针对串联型交流电压调节器，提出了一种新的基波正序计算方法以获取补偿电压的参考信号。

In an interview with BBC Radio Scotland UEFA's communications and public affairs director William Gaillard spoke about the updates to the San Siro: 'Although we have not received any official news from the Italian FA, I would imagine that what happened yesterday was a good rehearsal and the stadium would be at its normal capacity for the game between AC Milan and Celtic.

在一次对苏格兰BBC Radio 关于欧冠的访谈中，公共事务司长 William Gaillard 对圣西罗的翻新做出了评论：尽管我们并没有收到意大利足协的官方新闻，但我相信昨天进行的比赛是一次很好的预演，这座球场将以正常的容量承接AC米兰和凯尔尔特人之战。

To further understand mechanisms that control male gametogenesis and embryo development,we performed an genetic screen for mutations that caused distorted Mendelian segregation in Ac/Ds transposon system in Arabidopsis thaliana.

通过卡那霉素抗性(由突变体中标记基因编码)非孟德尔分离，从Ds插入的拟南芥突变体库中筛选到一个雄配子体发育突变体：ovp1和一个早期胚胎发生突变体eed1，我们对这两个突变体的表型和相关基因进行了研究。

Test results indicate that: AC VF drive can well meet the needs of load characteristics of GDR. It′s one of the best drive system for GDR.

试验结果表明：交流变频调速驱动能很好地满足岩心钻机的负载特性要求，是岩心钻机用比较理想的动力驱动方案。

Model JC-70DB AC variable-frequency gear-driven single shaft drawworks is developed to meet the need of the modern drilling technology.

为此 ，研制了JC— 70DB新型交流变频齿轮传动单轴绞车。

The design of the device using NC Lathe CA6140 control, part of the main transmission system using AC spindle motor and graded by the pulley driven spindle gearbox, through the inverter and gearbox to achieve sub; Feed System used by stepper motor driven ball screw slowdown after campaign vertical feed system through a gear after the ball screw drive, in the horizontal feed system through two gear-driven ball screw; Tool to automatically transfer tool carrier (4-position), thus achieving automatic tool change; by MCS-51 series 8051 data to be dealt with. from the I / O interface stepper pulse output signal to control the feed rate and itineraries; In order to maintain the function of cutting thread, to the outer end of spindle or other appropriate location loaded pulse generator; Lathe will be transformed into Tailstock manually controlled electric Tailstock.

本设计利用数控装置对CA6140普通车床进行控制，主传动系统部分采用交流调频主轴电动机经带轮及分级齿轮变速箱驱动主轴，通过变频器和齿轮变速箱实现分段无级变速；进给系统采用步进电机通过减速后驱动滚珠丝杠运动，在纵向进给系统中通过一级齿轮减速后驱动滚珠丝杠，在横向进给系统中通过二级齿轮减速驱动滚珠丝杠；刀架改为自动转位刀架从而实现自动换刀；通过MCS-51系列8051单片机对数据进行计算处理，由I/O接口输出步进脉冲信号控制进给速度和行程；为了保持切削螺纹的功能，要在主轴外端或其它适当部位装上脉冲发生器；将车床的手动尾座改造成为可控电动尾座。

If you were not , and OS X just booted normally, have no fear.

如果你没有，和OS X刚刚启动通常，没有恐惧。

I only want to preserve our all .

我只想保存好我们的一切