Application and Development of Induction Heating Technology at Home and Abroad

1. The status quo of induction heating abroad

With the development of power semiconductor devices and power electronic technology, the appearance of induction heating devices is also changing with each passing day, especially the changes in the volume, quality, and performance of the device. For example, the transistor type frequency conversion device of the same capacity is reduced by 2/3 in volume, 2/3 in weight, 1/2 in cooling water, 1/3 in power consumption, and 35% in efficiency compared with the tube-type frequency conversion device. It has a longer service life, is safer and more reliable, and is easy to realize automatic control. It is helpful to improve heating efficiency and quality. In addition, induction heating device has a smaller maintenance workload and can be opened at any time.

The technological development and induction heating application devices in industrially developed countries such as Germany, the United States, the United Kingdom, France, Japan, Italy, Spain, Belgium, and Russia are in the forefront of the world.

2. Domestic development and current situation

The application of domestic induction heating technology began in the 1950s, and the development was mainly after the reform and opening up, and it was mainly used in the manufacturing of machine tools, automobiles, and tractors. Induction heating is concentrated on the surface quenching of the workpiece, while the application of smelting and diathermy is less. Almost all of the induction heating technology comes from the former Soviet Union and the Czech Republic. In the 1980s, Zhejiang University independently developed the first parallel thyristor intermediate frequency power supply and promoted it nationwide.

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