Toroidal transformer is a major type of electronic transformer, which has been widely used in household appliances and other electronic equipment with high technical requirements, and its main use is as a power transformer and isolation transformer. Toroidal transformers have a complete series in foreign countries, which are widely used in computers, medical equipment, telecommunications, instruments and lighting. In the past ten years, China's toroidal transformer has grown from scratch, and has formed a considerable production scale so far, in addition to meeting domestic demand, it has also exported a large number of them. In China, it is mainly used for audio equipment and automatic control equipment of home appliances, as well as quartz lighting.