直流斩波电路设计

电力电子课程设计直流斩波电路的设计

系、部：电气与信息工程学院学生姓名：刘宗泉

指导教师：肖文英职称副教授专业：自动化

班级： 1102 班

完成时间： 2014年5月28日

摘要

直流斩波电路（DC Chopper）的功能是将直流电变为另一固定电压或可调电压的直流电，也称为直接直流-直流变换器（DC/DC Converter）。直流斩波电路一般是指直接将直流电变为另一直流电的情况，不包括直流-交流-直流的情况。习惯上，DC-DC变换器包括以上两种情况。

直流斩波电路的种类较多，包括6种基本斩波电路：降压斩波电路，升压斩波电路，升降压斩波电路，Cuk斩波电路，Sepic斩波电路和Zeta斩波电路，其中前两种是最基本的电路。一方面，这两种电路应用最为广泛，另一方面，理解了这两种电路可为理解其他的电路打下基础。

利用不同的基本斩波电路进行组合，可构成复合斩波电路，如电流可逆斩波电路、桥式可逆斩波电路等。利用相同结构的基本斩波电路进行组合，可构成多相多重斩波电路。

直流斩波电路广泛应用于直流传动和开关电源领域，是电力电子领域的热点。全控型器件绝缘栅双极晶体管（Insulated-Gate Bipolar,IGBT）综合了电力晶体管（Giant Transistor,GTR）和电力场效应管（Power Field Effect,MOSFET）的优点，具有良好的特性。目前已取代了原来GTR和一部分电力MOSFET的市场，应用领域迅速扩展，成为中小功率电力电子设备的主导器件。

本课程设计使用全控型器件IGBT做降压斩波电路控制器件；SG3525作为控制芯片，EXB841作为驱动芯片讨论降压斩波主电路、控制电路、驱动电路和保护电路的原理与设计。

关键词：IGBT；降压斩波电路；SG3525；EXB841

ABSTRACT

DC Chopper circuit (DC Chopper) is the function of the direct current (DC) to a fixed voltage or adjustable voltage direct current (DC), also known as direct dc-dc Converter (DC/DC Converter). Generally refers to the dc chopper circuit directly to the direct current into another, does not include dc - ac - dc.

Traditionally, DC - DC converter includes the above two cases.Dc chopper circuit sort is more, including six basic chopper circuit: buck chopper circuit, boost chopper circuit, buck chopper circuit, Cuk chopper circuit, Sepic chopper circuit and Zeta chopper circuit, including the first two are the most basic circuit. On the one hand, the most widely used two kinds of circuit, on the other hand, to understand these two circuits can lay the foundation to understand the other circuit.

Are combined with different basic chopper circuit, can constitute a composite chopper circuit, such as current reversible chopper circuit, bridge type reversible chopper circuit, etc. Using basic chopper circuit on the structure of the same combination, can constitute a heterogeneous multiple chopper circuit.

Dc chopper circuit is widely used in dc transmission and switching power supply, is a hotspot in the field of power electronics. All control type device select insulated gate bipolar transistor (IGBT) integrated the advantages of GTR and power MOSFET, has the good properties. Has replaced the original GTR and part of the power MOSFET market, rapidly expanding application areas, the small and medium-sized power power electronics equipment has become the dominant device.

Therefore, the curriculum design topic is: the design using the control device for IGBT buck chopper circuit. Mainly discuss buck chopper main circuit, control circuit sg3525, drive circuit exb841 and protect circuit principle and design.