Induction heating is based on the principle of electromagnetic induction, heats the workpiece to the workpiece using the heat generated by the workpiece. Due to the high induction heating efficiency, fast speed, good controlability, easy to achieve high temperature and local heating, easy to achieve mechanization and automation, has been widely available in smelting, casting, eluting pipe, hot forging, welding and surface heat treatment. application. In foreign countries, induction heating technology has matured. In terms of casting, the double melting process is rapidly developing, that is, using the medium frequency furnace insulation modification, precision casting of ball ink or alloy steel; in terms of forging, fast heat transfer hot forging, using induction heating, and its material utilization is up to 85%, the surface of the forgings can be less than 50 um; in the welding, quenching, China is committed to developing high-power full solid high frequency power supplies, on the one hand, it is committed to the development of highly automated heat treatment kit. my country's casting is large, and the foundry industry is still based on the turbine, the temperature and ingredients are large, and the waste rate is high. At present, my country's better foundry waste rate is also between 6% to 15%, while the general foundry's waste rate is as high as 30%. With the improvement of electricity supply in my country, the improvement of environmental protection requirements, development and expansion of induction heating, in large-scale enterprises promoted double melting process, transforming my country's casting industry is an effective way to comply with my country's coal resources. Ways. This renovation project not only involves the design and manufacturing of the insulation furnace, but also the optimization control system design of the double melting process, and also involves the high-power frequency sensing heating power supply. Similarly, in a comprehensive promotion of foreign advanced technologies in forging, welding, and hardening heat treatment, it is an inevitable trend in the transformation of my country's traditional industries. In recent years, in the research and development of some high-techs, induction heating is also used. The promotion and development of these advanced technologies is closely related to the research and development of induction heating power supply technology.