交流电

Alternating current reverse from negative to positive about 60 times a second .

交流电由负到正一秒钟大约变换六十次。

The first thing to do in an AC motor is to create a rotating field.

关于交流电机要做的第一件事就是制造旋转磁场。

The PV system only consists of a single phase full-bridge pulse width modulation inverter with an auxiliary LC series resonance circuit. DC power generated by the solar cells can be converted into AC power and fed to the utility line.

本系统利用四组全桥式直到交流转换器，配合一组LC串连滤波电路，即可将太阳电池所产生之直流电能转换成交流电送入电力系统中。

It also introduces working principle and developing tendency of the shearer with AC electric traction .

阐述了变频调速技术在采煤机中的应用，介绍了交流电牵引采煤机工作原理及发展趋势。

A circuit for detecting the phase angle of a three-phase alternating current includes a plurality of low-pass filters, a plurality of multipliers, a subtracter, a loop filter, an integrator, and a phase delay compensator installed between the subtracter and the loop filter, for compensating for phase delay of the input signal caused by the low-pass filters.

一种检测三相交流电相位角的电路，包括：若干个低通滤波器；若干个乘法器；一个减法器；一个环路滤波器；一个积分器；和安装在减法器与环路滤波器之间的相位延迟补偿器。

according to the users′ actually demand for uninterruptible power supply for loads,the internal structure of digital generator is analysed and the reason for its uninterruptible function can′t be achieved.a design of the uninterrupted power supply system which transformed from the digital generator is proposed.the system uses the inverter of generators,ac through inverter for loads,at the same time,charges the battery as ac is normal.inverter the battery dc converters to ac for load,meanwhile,starting generator,when power failure.the system applies uninterruptible power for load,whether the ac is normal or abnormal,and design voltage and frequency stabilization,output zero-interrupted,battery charging and discharging management.without requiring purchase an uninterruptible power supply separately,this design can avoid duplication of investment and wasting of resources.

快速安全提高汽轮发电机转子检修质量。。。摘要：针对用户对负载供电不间断的实际需求，分析了数码发电机的内部结构及其不能实现供电的不间断性能的原因，提出一种由数码发电机改造组成的交流不间断供电系统的设计方法。该设计利用发电机内部的逆变器，在市电正常时，由市电经过逆变器给负载供电，同时给蓄电池充电；在市电断电时，一边启动发电机，一边由蓄电池的直流电通过逆变器转换成交流电供负载使用，实现无论市电正常还是异常，系统对负载提供不间断电源。设计对市电进行稳压、稳频、输出零切换、蓄电池的充放电管理等新功能。此设计无需单独购买不间断电源，避免重复投资和资源浪费。

Inventor Nikola Tesla developed fluorescent lighting and wireless telegraphy, and was the first to channel alternate current.

发明家Nchangeikola Tesla发明了荧光灯照明和无线电信并成为引导交流电的第一人。

The present invention relates to an AC plasma display panel, and it is formed from several picture elements, several material electrodes and several column electrodes, in which every picture element in composed of three subpicture elements which are arranged in the triangular form, and the form of subpicture element is dependent on an isolating wall, and is suitable for emitting several visible lights.

本发明是关于一种交流电浆显示面板，其由多个画素、多个资料电极以及多个列电极所构成。其中，每个画素是由呈三角排列的三个次画素所构成，而次画素的形状是由一阻绝壁所决定，并且适于发出多种可见光。

The AC drive control system of the trolley bus with two kinds of power supply in Beijing is presented.

介绍了北京双源无轨电车交流传动控制系统，分析了无轨电车交流电传动系统的特点。

In order to control the AC with the chopping method, MOSFET is used to design a pair of two-way electronic switch and an AC Buck-Boost circuit is formed.

采用MOSFET构成一对双向导电型电力电子开关，对交流电进行斩波控制，形成交流Buck-Boost电路。

I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援，我们正徵召国家所有各种的力量：我们的外交及发展，我们的经济力量与道德劝说，所以你们与其他军人不须要孤独地负起国家安全的责任。