MOSFET升压斩波电路设计说明书.doc

电力电子技术课程设计说明书 MOSFET升压斩波电路设计 （纯电阻负载） 院 、 部： 电气与信息工程学院 学生姓名： 彭世平 指导教师： 肖文英 职称 专 业： 自动化 班 级： 自本1101班 完成时间： 2014-05-28  摘 要 直流斩波电路作为将直流电变成另一种固定电压或可调电压的DC-DC变换器,在直流传动系统、充电蓄电电路、开关电源、电力电子变换装置及各种用电设备中得到普通的应用.随之出现了诸如降压斩波电路、升压斩波电路、升降压斩波电路、复合斩波电路等多种方式的变换电路。MOSFET升压斩波电路又称为boost变换器，它对输入电压进行升压变换。通过控制电路的占空比即通过MOSFET来控制升压斩波电路的输出电压。直流斩波技术已被广泛用于开关电源及直流电动机驱动中，使其控制获得加速平稳、快速响应、节约电能的效果。全控型电力电子器件MOSFET在牵引电传动电能传输与变换、有源滤波等领域得到了广泛的应用。本文设计的是一个可调的直流升压斩波电源，利用MOSFET升压直流斩波电路原理,将直流电变为另一固定电压或可调电压的直流电，也称为直流-直流变换器（DC/DC Converter）。直流斩波电路的控制电路用PWM控制芯片SG3525为核心构成，控制电路输出占空比可调的矩形波。 关键词：升压斩波；占空比；变换器 ABSTRACT DC chopping circuit as a fixed voltage or adjustable voltage DC-DC converter DC into, in the DC drive system, charging a storage circuit, switching power supply, power electronic converter and the common application of electrical equipment. Appeared such as down converter circuit means pressure chopper circuit, chopper circuit, Buck chopper circuit, chopper circuit, composite.MOSFET chopper circuit is also known as the boost converter, it is boosted to transform the input voltage. The output voltage cycle through the MOSFET to control the boost chopper control circuit. DC chopper technology has been widely used in the switching mode power supply and DC motor, the acceleration is smooth, fast response, energy saving control. Full controlled power electronic devices MOSFET in traction electric drive power transmission and transformation, active power filter has been widely used. This design is an adjustable DC chopper power, using the principle of MOSFET boost DC chopper circuit, the DC to DC voltage or other fixed adjustable voltage, also known as the DC to DC converter (DC/DC Converter). Control circuit for DC chopper circuit with the PWM control chip SG3525 as the core, the control circuit outputs adjustable duty cycle rectangular wave. Key words boost chopper; duty cycle; converter 目 录 第1章 绪论 1 1.1直流