发布时间 : 星期一 文章感应加热电源论文更新完毕开始阅读
课题：
洛阳理工学院
毕业设计（论文）
小功率高频炉设计
系（部）：电气工程与自动化系 专业：应用电子技术 姓名：王超 指导教师：张刚
时间：2013 年 5月 8日
洛阳理工学院毕业设计（论文）
小功率高频炉设计
摘要
本文以高频炉的电源部分为研究对象，阐述了高频炉（感应加热电源）的优点、应用、基本原理和加热过程中的三种效应，以及感应加热电源的现状与发展趋势；介绍了本课题主要的研究内容及任务。本文分析了感应加热电源的总体结构；通过对常用的进线滤波电路的描述，选择了合适的滤波器；通过对感应加热电源常用的谐振回路和拓扑结构进行了分析，以及对串、并谐振电路的对偶特性和优缺点的比较，选择了更适合高频感应加热电源及本课题的串联谐振型逆变器。在功率的调节方面，分析了几种常用的调功方式、选用了移相脉冲宽度调制调功，可以通过芯片UC3895来实现，此外该芯片还具有设置死区，简化了死区电路。
本文主要对200KHz/10KW的高频炉进行设计，计算了整流和逆变部分的元器件参数；在计算结果的基础上选择了合适的三相不控整流模块、滤波电容、MOSFET开关模块和谐振电路的元器件；通过对几种驱动电路的比较，结合容量和开关器件，设计了合适的驱动电路。为保证电源正常运行，并使逆变器始终工作在功率因数接近或等于1的准谐振或谐振状态，以实现逆变器开关器件的零电流或零电压开关，设计了以传统模拟锁相环CD4046为核心的频率跟踪电路，并研究了电路的启动方式。为了使电源系统稳定运行，还设计了过流、过压和欠压保护。
关键词：感应加热，UC3895，移相调功，频率跟踪
I
洛阳理工学院毕业设计（论文）
Design OfLow Power High Frequency Furnace
ABSTRACT
This paper took supply of high-frequency furnace as the research object，introduced advantages and application and basic principles and three effects and situation and development trend of the high-frequency furnace（induction heating supply）；introduced the main subject of research and mission．The paper analyzed the overall structure of induction heating supply；described the filter circuit，selected the appropriate filter；through analyzing the induction heating supply used resonant circuit and topology structure，and compared the dual characteristics of the series and parallel resonant circuit，chosen the series resonant inverter，which is more suitable for high-frequencyinduction heating supply．For power regulation，paper analyzed several commonly used ways of power regulation，selected phase-shift pulse width modulation power regulator，which could be achieved with a chip—UC3895，it has the die zone setting feature．
Thepaper aimed at designing a highfrequency furnace of 200KHz/10KW and calculated parameters of some components；selected appropriate three-phase rectifier module, the filter capacitor，theMOSFETswitch module and the resonant circuit components；comparison of several different drive circuits，combined with the capacity and switching devices，the paper designed a suitable drive circuit．In order to ensure the normal operation of power and the inverter is always working inquasi-resonant and resonant state of power factor close to or equal one，achieving zero current or zero voltage switch ofswitch devices，the paper designed a frequency trackingcircuit which used the traditional analog phase-locked loop CD4046 as the core．In order to ensure the system stability operate，the paper also designed over-current, over-voltage and under-voltage protection．
Key words：Induction heating,UC3895,Phase-shifted power regulation,Frequency tracking
II
洛阳理工学院毕业设计（论文）
目录
前言 ........................................................................................................... 1 第1章绪论 ............................................................................................... 2 1.1 感应加热的基本知识 .................................................................. 2 1.1.1高频炉简介 .......................................................................... 2 1.1.2 感应加热优点及应用 ......................................................... 2 1.1.3 感应加热基本原理 ............................................................. 2 1.1.4 感应加热中的三种效应和穿透深度 ................................. 3 1.2 感应加热电源发展现状及趋势 .................................................. 4 1.2.1 感应加热电源频率划分 ..................................................... 4 1.2.2 国外高频感应加热电源发展现状 ..................................... 4 1.2.3 国内高频感应加热电源发展现状 ..................................... 5 1.2.4 感应加热电源发展趋势 ..................................................... 5 第2章感应加热电源总体设计 ............................................................... 8 2.1 感应加热电源总体结构 .............................................................. 8 2.2 线路滤波器的作用和结构 .......................................................... 8 2.3 负载分析及谐振谐振电路 ........................................................ 10 2.3.1 负载等效电路 ................................................................... 10 2.3.2 串联谐振电路 ....................................................................11 2.3.3 并联谐振电路 ................................................................... 13 2.4 逆变器的选择 ............................................................................ 14
III