诞生于上个世纪60年代的开关电源是一种利用现代的电力电子技术来控制开关管导通和关断的时间比，从而使输出电压保持稳定的一种电源。一般而言，开关电源的组成部分为PWM（脉冲宽度调制）控制IC和电力MOSFET。 你这个是翻译？？？什么都没有啊 那个不准的 能看懂就行了
开关电源从诞生问世以来，由于其无论在效率、体积，还是在重量方面都要优于线性电源，所以在半个世纪以来，伴随着电力电子技术的飞速发展，开关电源的发展也是日新月异，逐步在小功率场合取代了线性电源。
由于具有较小的体积，较轻的重量，高效率、小波纹、低噪音等特性，使得开关电源的应用非常广泛，大到军事、航天，小到家电用器，现在都已经离不开开关电源了。
开关电源的发展是基于电力电子器件的发展的。在过去的半个多世纪中，电力电子器件的发展是飞速的，更新换代更是让人眼花缭乱。所以，开关电源的发展更是迅速。在过去的时间里，开关电源经历了功率半导体化、高频化和软开关技术及开关电源系统的集成技术三个主要发展阶段。而从上个世纪八十年代开始研究的高频化和软开关技术，是过去二十年国际电力电子界研究的热点之一。
在目前，开关电源也已经成为了当今电力和电子产业飞速发展而不可缺少的一种电源方式。国内外对开关电源技术在不同领域都有了很多新的研究热点。而当今开关电源正向着集成化、智能化的方向发展，高度集成、功能强大的单片开关电源代表着当今开关电源发展的主流方向。
近年来开关电源的高频变换器出现了推挽、全桥、半桥、单端正激和单端反激等多种形式，新型的软开关控制技术也有零电压和零电流两种。本文介绍了一款小功率双管正激式软开关控制方式的开关电源，采用市电供电，带隔离变压器，给出了双管正激式DC-DC变换器、PWM控制及驱动电路的详细设计方法及设计思路,并使用ORCAD/Pspice软件对开关电源主电路系统性能进行了仿真，根据仿真结果显示,该开关电源效率高，输出电压稳定，电路设计较完善，性能稳定。
如果有完美解答可速发到我291572354@qq.com邮箱 十万火急 万分感谢 ！！！！！！
参考知识1
Born in the s of switch power supply is a use of modern power electronic technology to control switch tube conduction and shut off than the time, so that the output voltage stability of a power supply. Generally speaking, part of switch power supply for PWM (pulse width modulation) control IC and power MOSFET.
From birth, switch power supply since the advent, because its no matter in efficiency, volume, or in weight than linear power supply, so in half a century, with the rapid development of the power electronic technology, the development of switch power supply is also changing gradually in small power occasions instead of linear power supply.
Because it has a small volume and the lighter weight, high efficiency, low noise, small ripple properties. Make the switch power supply is widely applied to the military and aerospace, small to home appliance apparatus, have now without switching power supply.
The development of switch power supply is based on the development of the power electronics device. In the past half century, the development of the power electronics device is rapid, renewal is to let a person dazzling. Therefore, the development of switch power supply is more quickly. In the past time, switch power supply power semiconductor melt, the experience of high frequency and soft switch technology and switch power supply system integration technology three main stages of development. And from the eighty s research of soft switch technology and high frequency, is the past twenty years international power electronics industry one of the hot spot in the research.
In the present, switch power have also become the electricity and electronics industry rapid development and indispensable a power supply mode. Domestic and foreign switch power technology in different domain has a lot of new hotspot. But in today's switch power supply is toward integration, intelligence the direction of development, highly integrated, powerful single piece of switch power supply represents the switch power supply the mainstream of development direction.
In recent years of switch power supply high frequency converter appeared the push-pull, bridge, half bridge, single straight shock and the ocl flyback and so on many kinds of form, the new type of soft switch control technology is also with zero voltage and zero current two kinds. This paper introduces a little power two pipe is shock type soft switch control mode of switch power supply, using the utility power supply, take the isolated transformer, give the two pipe is shock type DC-DC converter, PWM control and power circuit of the detailed design method and design ideas, and use ORCAD/Pspice software to the circuit switching power supply system performance simulation, according to the simulation results show that the switch power supply, high efficiency, the output voltage stability, circuit design is more perfect, stable performance.
参考知识B
随着经济体制改革的不断深入,我国传统的企业业绩评价体系已不能适应需要。本你好，以下是我的翻译，希望对你有所帮助： Executive summary The rapid追问