反激式开关电源设计学位论文.docVIP

ABSTRACT 摘 要 PAGE 42 PAGE I Ⅲ 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 ABSTRACT For 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 PAGE I Ⅲ 目 录  TOC \o 1-3 \h \z \u  HYPERLINK \l _Toc263270671 第1章 绪论  PAGEREF _Toc263270671 \h 1  HYPERLINK \l _Toc263270672 1.1 开关电源概述  PAGEREF _Toc263270672 \h 1  HYPERLINK \l _Toc263270673 1.1.1 开关电源发展历史  PAGEREF _Toc263270673 \h 1  HYPERLINK \l _Toc263270674 1.1.2 开关电源分类  PAGEREF _Toc263270674 \h 3  HYPERLINK \l _Toc263270675 1.1.3 开关电源的发展趋势  PAGEREF _Toc263270675 \h 7  HYPERLINK \l _Toc263270676 1.2 本课题选题的依据和现实意义  PAGEREF _Toc263270676 \h 8  HYPERLINK \l _Toc263270677 1.2.1 选题来源  PAGEREF _Toc263270677 \h 8  HYPERLINK \l _Toc263270678 1.2.2 选题的意义  PAGEREF _Toc263270678 \h 9  HYPERLINK \l _Toc263270679 1.3 本文的主要内容及工作  PAGEREF _Toc263270679 \h 10  HYPERLINK \l _Toc263270680 1.3.1 课题内容  PAGEREF _Toc263270680 \h 10  HYPERLINK \l _Toc263270681 1.3.2 课题拟解决的主要问题  PAGEREF _Toc263270681 \h 1