文档介绍：编号
南京工程学院
毕业设计(论文)
题目:大功率直流弧焊电源——控制电路部分
南京工程学院(系)电气工程及其自动化专业
学号: 0531150844
学生姓名:
指导教师:
摘要
软开关技术是解决逆变弧焊电源可靠性的核心技术。本文提出了一种软开关逆变弧焊电源的设计方案,设计主要分为两个部分:主电路和控制回路。计算出了主电路各个部分元件的参数,以及几个主要谐振参数的设计方法。本文分析了超前臂的关断功耗与并联电容之间的关系,串联电容及回路电感对环流期的电流变化的影响。在实践中采用本方案表明,降低了开关应力及损耗,提高了整机可靠性,降低了弧焊电镐的成本。
为减小开关器件的开关损耗,提高开关频率,减小开关电源的体积、重量,提高效率,介绍了新型移相控制零电压开关PWM变换器(PSZVS—PWM)工作原理,实现零电压开关的条件,并给出了由控制芯片UC3875构成的实用高频开关电源电路。
本文也对目前在电力电子技术中广泛使用的IGBT驱动模块EXB841的使用方法进行了改进,克服了EXB841本身的缺陷,提高了保护的可靠性和延长模块的使用寿命,对使用好新型电力模块有一定的借鉴作用。
关键词:逆变电源;移相控制;UC3875;驱动电路;弧焊电源
Abstract
Soft switch is the key technology to solve the problem of invert welding power article introduces a design plan of soft switch invert welding power source,there are two part:the main circuit and the control also analyzes the parameter of the main circuit,and the design methods about the main resonance parameter,and the cost of the leading arms and the parallel C, series C and loop L affect the loop shows that can lower the switch stress,wastage, and cost and even improves the reliability.
It also introduce the control loop .reducing the switching loss of transistors and increasing the switching frequency,So that the volume and weight of switching power supply can be reduced and the efficiency of the switching power supply can be improved,by introducing the operation principle of shifting phase,zero voltage switching,the condition for realizing the ZVS and a practical high frequency switching power supply with UC3875 were given.
the improvement of IGBT driving module EXB841 widely used to current electric power and electronic es the limitation of EXB841 itself,enhances the reliability of protection and prolongs the service life of the module,which provides a reference at a certain extend to use new electric power modules.
Key word:inverter;arc welding;soft switch;UC3875
目录
摘要 II
ABSTRACT III
目录 IV
第1章绪论 1
电源发展的历程 1
弧焊电源的分类、特点及运用 1
弧焊电源技术的现状与发展 2
弧焊