LED灯驱动电源的设计与制作

黄河科技学院毕业设计说明书 第I页

LED灯驱动电源的设计与制作

摘 要

近年来，电源技术无论在理论研究，还是生产应用方面都取得了许多成果和长足的进步。开关电源的研究涉及电力电子、自动控制等技术领域，软开关、高效率是开关电源的重要研究方向。因此，PFC（Power Factor Correction）技术和软开关PWM（Pulse Width Modulation）技术作为成熟的技术，近些年来在中、小功率乃至大功率开关电源中得到普遍的应用。

本文介绍了一种具有功率因数校正和软开关技术的大功率开关电源的结构、原理和设计过程等。整个电源由输入电路、整流电路、反馈电路、过压保护电路、过流保护电路、输出电路等，还具有软启动功能。开关电源具有效率高、体积小、重量轻、可靠性高、负载分担容易等一系列特点。本课题采用的开关方式是全桥全控整流滤波，而且电源还运用了软开关技术，使它的损耗明显降低，DC-DC变换使用斩波升压电路来实现，结构简单，转换效率高。

关键词：功率因数校正，PWM技术，保护，效率

黄河科技学院毕业设计说明书

Design And Production Of LED Lamp’s Drive Power 第II页

Author:Yang Longwei

Tutor:Pang Baotang

ABSTRACT

In recent years,power supply technique has developed very quickly and it has obtain very big of progress in theories researching and produced application.The research of power supply technique involves many realma such as the electric power electronics and the auto control.The soft switch technique and the high efficiency are important research contents of power supply.Therefore,Power Factor Correction(PFC) technique and soft-switching PWM technique are both widely applied in low power SMPS and high power SMPS.

This article introduced a high power SMPS’s structure, the principle and the design process and so on with PFC and soft-switching PWM technique.The entire power source by the input circuit, the leveling circuit, the feedback circuit, the overvoltage protection electric circuit, the overflow protection circuit, the output circuit and so on, but also has the soft start function. The switching power supply has the efficiency to be high, the volume is small, the weight is light, the reliability is high, the load shares and so on easily a series of characteristics. This topic uses the switching mode is the entire bridge all controls the rectification filter, moreover the power source has also utilized the soft switch technology, causes its loss to reduce obviously, the DC-DC transformation use cuts the wave boosted circuit to realize, the structure is simple, the transfer efficiency is high.

Key words: PFC，PWM technique，protection，efficiency

目 录

1绪论 ......................................................................................................................................... 1

1.1开关电源技术发展概况 .............................................................................................. 1

1.1.1电力电子技术的发展 ....................................................................................... 1

1.1.2开关电源技术的应用领域 ............................................................................... 2

1.1.3开关电源的发展趋势 ....................................................................................... 3

1.2研究背景和意义 .......................................................................................................... 5

2开关电源原理 ......................................................................................................................... 7

2.1原理简介 ...................................................................................................................... 7

2.2电路原理 ...................................................................................................................... 9

2.3脉宽调制（PWM）技术 ............................................................................................. 9

2.4反激变换器 ................................................................................................................ 10

2.5功率因数校正 ............................................................................................................ 11

2.5.1功率因数校正技术 ......................................................................................... 11

2.5.2谐波的产生及防范措施 ................................................................................. 11

2.5.3谐波补偿和功率因数校正概念的提出 ......................................................... 12

3设计过程 ............................................................................................................................... 13

3.1主要元器件介绍 ........................................................................................................ 13

3.1.1 L6562引脚说明 ........................................................................................... 13

3.1.2 LM358引脚说明 ............................................................................................ 14

3.2输入电路的设计 ........................................................................................................ 14

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