学
号 14052101086
毕业设计（论文）
题目：基于UC3854 的功率因数校正电路设计
½
系
者
½ 杨 滨
届
别
业
称
2009 届
自动化
讲 师
别
机械与电气工程系
专
荣
军
职
指导教师
完成时间
2009 年5 月21 日
毕业设计（论文）
摘要
本文介绍了功率因数校正Boost变换器的基本工½原理和Boost变换器常用控制芯片UC3854的
工½原理，设计了基于UC3854的Boost变换器的控制电路。该电路采用平均电流模型，它通过脉½
调制输出的一连串脉冲信号来控制电路中开关晶½管的导通与截止, 从而将输入电流与输出电压
的相½重新调整到同相的状态, 最终达到功率因数校正的目的。
通过比较和分析得知，
该电路在有
源功率因数校正方面有着结构简单，适应范围广等优点。
关键词
：
有源功率因数校正（PFC）； Boost控制电路； UC3854
I
毕业设计（论文）
ABSTRACT
This paper introduces the Power Factor Correction Boost converter's basic working principle and the
working principle of common control chip UC3854 of Boost converter , designing the control circuit
what based on the UC3854 of Boost converter . Using the average current model, UC3854 controls the
state of the switching transistor in the circuit by outputting a series of PWM(Pulse Width Modulation)
signals. By this mean, it readjusts input current and output voltage to synchronization, thus fulfilling
power factor correction. Through comparison and analysis we know that the circuit in the active power
factor correction has a simple structure and wide range adaption and so many advantages.
Keywords:
active power factor correction(PFC); boost control circuit; UC3854
II
毕业设计（论文）
目½
摘要
...................................................................................................................................................................................... I
ABSTRACT......................................................................................................................................................................... II
目½
....................................................................................................................................................................................III
1
绪论
..................................................................................................................................................................................1
1.1
开关电源概述.......................................................................................................................................................2
1.2
谐波电流对电½的危害.......................................................................................................................................2
1.3
功率因数校正的意义...........................................................................................................................................3
1.4
总½方案设计与论证...........................................................................................................................................4
1.5
系统的技术指标和系统构成...............................................................................................................................4
1.5.1 系统的技术指标.......................................................................................................................................5
1.5.2 系统的总½构成.......................................................................................................................................5
2 Boost
升压型变换器的主功率电路的设计....................................................................................................................5
2.1
功率因数（FC）的定义和实现方法...................................................................................................................5
2.1.1 功率因数的定义.......................................................................................................................................5
2.1.2 功率因数校正(PFC)实现方法.................................................................................................................6
2.2
有源功率因数校正校正（APFC）原理...............................................................................................................6
2.2.1 有源功率因数校正技术的研究现状.......................................................................................................6
2.2.2 有源功率因数校正原理...........................................................................................................................7
2.2.3 有源功率因数校正技术的分类...............................................................................................................8
2.3 Boost
升压型变换器工½原理和控制方式........................................................................................................9
2.3.1 Boost 变换器的工½原理........................................................................................................................9
2.3.2 Boost 变换器常用控制方式..................................................................................................................11
2.4
主功率电路主要元器件的参数设计.................................................................................................................12
2.4.1 升压电感设计.........................................................................................................................................12
2.4.2 输出电容
C
0
的选择................................................................................................................................13
2.4.3 功率开关与二极管.................................................................................................................................14
3
基于
UC3854
控制电路的设计........................................................................................................................................14
3.1 UC3854
控制器的内部结构和功½特点............................................................................................................14
3.1.1 UC3854 控制器的内部结构介绍............................................................................................................14
3.1.2 UC3854 控制器各引脚的功½................................................................................................................15
3.2 UC3854
控制电路各参数的设计........................................................................................................................17
3.2.1 UC3854 中的前馈½用..........................................................................................................................17
3.2.2 电流的感测...........................................................................................................................................18
3.2.3 峰值电流限制.......................................................................................................................................19
3.2.4 乘法器的设定.......................................................................................................................................20
3.2.5 前馈电压信号.........................................................................................................................................21
3.2.6 乘法器的输入电流.................................................................................................................................22
3.2.7 振荡器的频率.........................................................................................................................................23
3.2.8 电流误差放大器的补偿.........................................................................................................................23
3.2.9 电压误差放大器的补偿.........................................................................................................................24
3.3
谐波失真预计.....................................................................................................................................................25
3.3.1 谐波的产生.............................................................................................................................................25
III
毕业设计（论文）
3.3.2 衰减量
G
ff
.............................................................................................................................................25
4
结束语
.............................................................................................................................................................................26
参考文献
............................................................................................................................................................................27
致谢
....................................................................................................................................................................................28
附½
....................................................................................................................................................................................29
IV
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