1、 I 摘要摘要 针对晶体管串联提供稳压电源的具有体积很大而且笨重的工频变压器，体积 和重量都很大的滤波器，占用较大空间，质量较大，效率较低不适用现在电子技 术的发展的的缺点，提出了发展新型电源的意见。为了能够适用电力电子越小型 化、 轻型化的要求， 开关电源随之出现。 开关电源采用功率半导体作为开关元件， 通过周期性通断开关，控制开关元件的占空来调整输出电压，因为开关电源是直 接对电网电压进行整流、滤波、调整，不需要电源变压器，工作频率高，滤波电 容小、电感小，所以体积相对较小，而且开关电源的功耗较低，对电网的适用能 力强，所以开关电源的应用逐渐取代了传统的电源。开关电源的发展促使了电力 电子
2、器件朝着轻薄化的发展，开关电源有多种拓扑结构，选择合适的拓扑结构， 合适的器件，是设计开关电源的重中之重。 关键字：开关电源；拓扑结构；稳压管；芯片 II Abstract Series to provide power supply for the transistor with large and bulky size-frequency transformers, size and weight are great filters, occupy a larger space, the quality of larger, less efficient not apply to the
3、development of electronic technology is now thepaper proposed the development of new power views.In order to apply more power electronics miniaturization and light requirements, switching power supply soon.Switching power supply using power semiconductor devices as switches, through periodic on-off
4、switch, control switch to adjust the air component of the total output voltage, because switching power supply is directly rectified mains voltage, filter, adjustment, no power transformer, high frequency, filter capacitance, inductance is small, so relatively small size, low power consumption and switching power supply on the application of strong power, so switch power gradually replaced the traditional power.Switching power supply prompted the development of power electronic devices toward t
