摘要
感应加热电源具有加热效率高，速度快，可控性好，易于实现高温和局部加热，易于实现机械化和自动化等优点，目前已在金属熔炼、工件透热、淬火、焊接、铸造、弯管、表面热处理等行业得到了广泛的应用。
本设计研究了中频感应加热及其相关技术的发展、现状和趋势，并在较全面的论述基础上，对2.5kHz/250kW可控硅中频感应加热电源的整流电路以及控制电路进行了设计。
本文设计的电源电路可用于大型机械热加工设备的感应加热电源。
整流电路采用三相桥式全控整流电路，其电路结构简单，使电源易于推广；控制策略选用双闭环反馈控制系统，改善了信号迟滞的缺点，为以后研制大功率、超音频的感应加热电源打下了基础。
关键词：可控硅中频电源；感应加热；逆变；保护电路
Design of Induction heating power of medium
frequency
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 2.5kHz/250kW 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 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....................................................... 错误!未定义书签。
1.1 感应加热电源的特点和应用 (1)
1.2 感应加热电源的发展阶段 (1)
1.3 感应加热电源发展的主要因素 (2)
1.4 感应加热电源的发展趋势 (2)
2.感应加热电源 (5)
2.1 基本工作原理 (5)
2.2 基本结构 (6)
3.整流电路设计 (6)
3.1 整流电路的分类 (6)
3.2 整流电路的选择 (7)
3.3 三相桥式全控整流电路 (7)
3.4整流电路的参数设计 (9)
4.控制电路设计 (10)
4.1 控制电路系统的概述 (10)
4.2 控制电路的结构与原理 (10)
4.3 控制电路的作用 (12)
4.4 控制策略 (13)
4.5 2.5kHz/250kW感应加热电源控制电路结构 (15)
4.6 控制触发回路频率跟踪调节 (15)。