Since Mitchell Faraday invented the transformer, the transformer production process and the materials used have undergone major changes. At first, laminated transformers were widely used because of the easy winding on the coil skeleton. However, due to the air gap in the magnetic circuit of the laminated transformer, the effectiveness of the magnetic circuit is not high. Although the C-core transformer reduces the air gap and retains the advantage of easy winding on the coil skeleton, there is still an air gap in the magnetic circuit.

In 2010, domestic and foreign computer giants have launched low-cost notebook computers, the domestic TD-SCDMA trial commercial began to issue numbers, color TV manufacturers to promote digital TV to guide the concept of digital TV deeply into the people's heart, the market was once described the rapid rise in demand for network communication transformers market beautiful picture. However, a United States subprime mortgage financial storm swept the global market consumption power fell rapidly, even the network communication transformer companies optimistic about the growth of the most robust laptop industry has also appeared "peak season is not prosperous, off-season is weaker" situation. The depression of the market and the unmarketable products of the whole machine have directly affected the market demand for network communication transformer products.

The report shows that in 2018, China's auto market was cold in the short term, while new energy vehicles bucked the trend, the market size expanded rapidly, and it is expected to achieve the ownership target of 5 million vehicles in 2020. With the continuous introduction of new energy vehicle policies, the new energy vehicle industry has also entered a deeper marketization process.

Judging from the entry barriers and competition pattern of China's inverter industry, the profit margin of the industry is at an upper medium level, and there is still an opportunity to obtain a higher return on investment. Inverter is a high-tech product with high technology content, high added value and high benefit return, which is in line with the national industrial development policy. Frequency conversion speed regulation technology has developed rapidly in recent years, in the energy shortage, environmental problems are increasingly serious today, energy conservation and emission reduction has a quantitative assessment index. With the development and comprehensive utilization of frequency conversion high-speed technology, the inverter industry in cement, elevator, printing, electricity and so on