摘 要反激式开关电源因其结构简单，成本低被广泛应用。本文介绍了反激式开关电源的工作原理，比较了电流控制，电压控制和 V2控制三种控制模式，重点阐述了电流控制模式的原理和优点。介绍了 UC3843 的特点，并基于该芯片从数学上建立稳态模型，得到有力的理论依据，为高频变压器和其它电路设计提供了技术参数。最后在硬件实现了一个有很好电压调整率，负载调整率，纹波小的反激式开关电源。关键词：反激式开关电源，UC3843，高频变压器，纹波ABSTRACTFor simple circuit and low cost, flyback switching power supply is widely used. This paper introduce the introduces the working principle of current-mode flyback switching power supply ,made a Comparison of several regular controlling methods of it ． Based on the comparison between the different mode ， it emphasizes the working principle and advantages of the current—mode switching power supply. And then introduce the internal structure and working principal of UC3843．Based on it, a stable mathematical mode of current was built. It provides the evidence to design ， analyse ， and calculate the stability and dynamic characteristic of the following circuit.At last, produced a flyback switching power supply with good voltage regulation, load regulation, small ripple was produced.Key word: flyback switching power supply, UC3843, high frequency transformer, ripp目 录第 1 章 绪论...................................................................................................................11.1开关电源概述...........................................................................................................11.1.1开关电源进展历史...........................................................................................11.1.2开关电源分类...................................................................................................31.1.3开关电源的进展趋势................................................................
