摘要：感应加热电源拥有加热效率较高，可控性好，速度高，容易实现高温与局部加热，便于实现机械化与自动化等优点，现已在金属的熔炼、淬火、工件透热、焊接、弯管、铸造、表面热处理行业取得广泛的应用。该文介绍了中频感应加热与其相关技术的发展、现状以及趋势，并在比较全面的论述基础上，设计了一款新型的20kHz/15kW可控硅中频感应加热电源，并使用MATLAB进行了仿真。该电源由整流器，逆变器以及控制电路，保护电路组成。整流电路用三相桥式全控整流电路，电路结构简单，电源易于推广；逆变部分采用串联谐振逆变器，控制电路采用SG3525A作为主控芯片，双闭环反馈控制系统，可以改善信号迟滞的缺点，为以后研制超音频、大功率的感应加热电源打下了基础。66443

毕业论文关键词：可控硅中频电源，感应加热，逆变，保护电路

Abstract: Induction heating power is equipped with lots of advantages such as high heating efficiency, fast speed, good controllability, which is prone to make heating of high and partial temperature ，and realize mechanization and automation. At present metal melting, work piece heat penetration, quenching, welding, casting, elbow piece, surface heating processing has been widely applied. 

Induction heating of medium frequency and development, current situation, and tendency related technology has been studied，and have made quite comprehensive and in the profound elaboration foundation, this article has carried on the design to main circuit and the inversion control of the 20kHz/15kW silicon-controlled rectifier intermediate frequency induction heating power. This design is used for big facility of mechanical heating processing. Structure of rectification circuit is easy, which makes power popularized easily. Three-phase bridge rectification circuit is used in Rectification circuit. Rectification circuit uses SG3525A  as control ship feedback control of two closed loop, improving the disadvantages. The foundation for inventing induction heating power of big power and super audio is made.

Key words: Controllable silicon medium power, Induction heating, Inverter, Protect circuit

目  录

1  绪论 4

2  感应加热电源工作原理 4

3  感应加热电源基本结构及控制策略 5

3.1 整流部分 6

3.2逆变部分 7

4 感应加热电源电路设计 8

4.1 主要设计参数 8

4.2整流部分设计 8

4.3逆变部分设计 11

4.4控制部分设计 11

4.5 过流和过压保护电路 16

5 仿真 17

结 论 22

致谢 23

参考文献 24

1  绪论

感应加热技术是在20世纪初才开始应用于工业生产的，其具有加热速度快、物料内部发热与热效率高、加热均匀并且具有选择性、产品质量好、无环境污染、可控性好以及易于实现生产自动化等优点，因此近年来得到了快速发展。在现代工业的金属熔炼、热处理、焊接等过程中，感应加热被广泛的应用。感应加热是根据电磁感应原理，利用工件中涡流产生热量进行加热的，它加热效率高、速度快、可控性好，易于实现高温和局部加热。随着电力电子技术的不断成熟，感应加热技术得到了迅速发展。