Induction heating comes from the phenomenon of electromagnetic induction discovered by Faraday, which is that the alternating current produces an inductive current in the conductor, leading to a conductor.
Fever. In 1890, Swedish technicians invented the first induction melting furnace, which had a core furnace. In 1916, the American invented the closed slot with a core furnace, and the induction heating technology gradually entered the practical stage. The rapid development of power electronics devices and technology in the 20th century greatly promoted the development of induction heating technology.
In 1957, the United States developed the thyristor, a milestone in power electronics, marking the beginning of modern power electronics technology and revolutionized the induction heating technology. In 1866, Switzerland and west Germany first developed the induction heating device using thyristor, and the induction heating technology began to develop rapidly.
After the 1980s, power electronic devices developed rapidly again, and devices such as GTO, MOSFET, IGBT, MCT and SIT appeared successively. The induction heating device also gradually abandoned the thyristor and began to adopt these new devices. Nowadays, IGBT and MOSFET are commonly used, and IGBT is used for higher power occasions, while MOSFET is used for higher frequency. It is reported that IGBT can be used in foreign countries to achieve power over 1000kW and more than 50kHz. However, MOSFET is more suitable for high frequency applications. It is usually used in small and medium power occasions of several kilowatts, which can reach up to 500kHz and even a few megahertz. However, there is also an induction heating device with high power of MOSFET, such as the 2000kW/400kHz device developed in the United States.
The real application of induction heat treatment technology in China began in 1956, when the former Soviet union was introduced, mainly in the automobile industry. With the manufacture of power supply equipment in the 20th century, the induction quenching process equipment is also closely followed. Now domestic induction quenching process of the equipment manufacturing industry is also growing, product variety, originally need to import equipment, gradually replaced by goods, save foreign exchange for countries at the same time, the development of domestic related enterprises. At present, the service object of induction heating manufacturing industry is mainly automobile manufacturing, and the modern metallurgical industry will have a great demand for induction heating.