电源电压

A phase-shifted controlling PWM DC/DC full bridge converter with softswitching is proposed and used to realize a constant current power of20A(5～48V).This full bridge converter utilizes the transformer leakageinductance(or the resonant inductance in series with transformersprimary)and the autoecious capacitance of MOSFET to achieveZVS(Zero-Voltage-Switching),as a result it can decrease the switchingwaste,increase the switching frequency,and diminish the power bulk.

本文使用一种通过移相控制进行脉宽调制的软开关全桥变换器来实现20A(5～48V)恒流源，这种全桥变换器利用变压器的漏感、原边串联谐振电感和功率管的寄生电容来实现开关管的零电压开通，降低了开关损耗，提高了开关频率，减小了电源体积。

As for charging for Intelligent Power Storage Mobile Power Supply, insert 5P end of data wire into 5P end of Intelligent Power Storage Mobile Power Supply, then connect USB end of data wire to computer and charger with USB interface to electricize before keeping a large quantity of power please always remember to switch from ON gear to OFF gear after finishing electricizing in case that a charger with voltage of 5V-6V is adopted.

给智能储电宝移动电源存储电量，将数所线5P 头插入智能储电宝5P 母头，然后将数据线一端 USB 头接上电脑和带有 USB 的充电器进行充电（切记电压在5V-6V 的充电器，充电完成后将开关 ON 档移动到 OFF 档）锁住电量。

According to the analysis of reasons of transformer mal-operation in Pingdingshan Electric Power Bureac for years , and according to the present situation of transformer protection studies and applications at home and abroad. This paper points out the shortcomings of discrimination between internal faults and magnetizing inrush, the problems existing in differentiating the slight faults of turn-to-turn in transformer are also advanced. On the base of the electromagnetic characteristics of transformer, the relations between fluxional differential current and voltage of source side analyzed, all the operating states of transformer simulated by EMTP/ATP, the criterion of magnetizing inrush in transformer is got. Through the wavelet analysis of current waveform, using the intense reaction of wavelet transform to the little change of signal, the internal faults of transformer are distinguished by testing local extremum.

本文根据平顶山市电业局历年来变压器保护误动的原因分析，并根据国内外变压器保护使用和研究的现状，指出了现有变压器保护在区分变压器励磁涌流和内部故障方面以及在判断变压器匝间轻微故障方面存在的问题和不足；从变压器电磁特性出发，分析了电源侧电压和电流微分之间的关系，利用电磁暂态仿真程序对变压器各种运行状态进行了仿真，并以此建立了判断变压器是否含有励磁涌流的判据；通过对电流波形的小波分析，利用小波变换对信号微小变化极强的反映能力，通过检测电流的局部极值点来区分变压器运行状态，并作为上述判据的补充。

In order to control the forementioned switching power supply to accomplish an adjustable pulse voltage, the microcontroller W77E58 is combined with some programs to form an intelligent control system whose primary function is regulating and driving pulse signal.

结合一定的软件程序，建立了以W77E58为核心的智能控制系统，实现脉冲信号的调整和驱动，从而对前述的开关电源进行控制，以获得可调整的脉冲电压。

Li-ion battery is preferred in the demand of high dependency and safety because of its high energy-weight ratio, high voltage and memoryless effect .

中文摘要微小卫星的发展对其电源系统设计提出了小型化和集成化的要求，而锂离子电池以高能比，高电压和无记忆效应等优点，很好的满足这些要求。

As a result of the frequency conversion electrical machinery particularity, uses the junction to hand over the frequency changer power supply the electrical power system, caused the electric current and the voltage waveform has the distortion, the profile turned the nonsine wave by the original sine wave.

由于变频电机的特殊性，采用交交变频器供电的电源系统，使得电流和电压波形发生了畸变，波形由原来的正弦波变成非正弦波。

By a voltage-traced SPWM technology, the sine pulse width modulation wave was derived and the project of voltage output was designed. Resultantly, the microcontroller was fully used in the variable-frequency power system.

讨论了系统的硬件、软件设计和正弦脉宽调制波的生成和输出稳压方案的设计，采用了实时电压跟踪SPWM技术，使单片机在变频电源系统中得到了有效的应用。

Soaraway completely automatic clean ball machine: Four the silk pair the ball completely automatic clean ball's machine performance is as follows, voltage: 380V(220V) power power source, power: 1.5(2.2)kw, installs the silk: 4(6) 2(3) ball, divides the ball way: The completely automatic electricity fuse is divided the ball way, the characteristic: The completely automatic operating mode, uses the most advanced guide block, will protect the tinsel the surface not by the abrasion, will cause the tinsel surface not to have the gloss rustily, will produce the product flower even, will be bright, is artistic, output for each hour 8(10)kg about.

腾飞全自动清洁球机：四丝双球全自动清洁球机的性能如下，电压： 380V(220V)动力电源，功率：1.5(2.2)kw，装丝：4(6)丝2(3)球，分球方式：全自动电熔断分球方式，特点：全自动操作方式，采用最先进的导丝器，保护金属丝的表面不会被刮伤，造成金属丝表面生锈没有光泽，生产出来的产品花型均匀、明亮、美观，产量为每小时8(10)kg左右。

Connect the luminaire to a supply adjusted to the voltage recorded in Subitem (1) and let it operate; and

将灯具的电源的接通，按小项（1）那样调整电压，让其一直亮着。

Connect the luminaire to a supply adjusted to the voltage recorded in Subitem (1) and let it operate; and

将灯具的电源的接通，按小项（1）那样调整电压，让其一直亮子。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。