Power supply is a technology product centered on power electronics. Power supply "is a terminal product, and" power supply "product is a specific product embodiment of" power electronics "application technology. Power electronic power supplies usually refer to power products that use power electronic technology and are an important component of power electronic equipment. The power supply industry, with power electronics as its core technology, is the foundation for the development of various high-tech industries. All high-precision and cutting-edge technology equipment requires technical support from power electronic power supplies. With the rapid development of the IT industry, CI industry, and PC machine. Drive the takeoff of the power supply industry. The power supply industry is widely used in various industries and is inseparable from the national economy. Chinese power supply enterprises have generally been established for a relatively short period of time, with only 11.3 percentage points of enterprises having been established for more than 10 years. At the same time, with the deepening of China's reform and opening up, foreign-funded enterprises and joint ventures are gradually increasing, promoting competition and also providing opportunities and challenges for local enterprises. For the operational status of power supply enterprises, due to strong overall demand, although competition intensifies, the industry's average revenue and profit have both increased. At the same time, in order to have the potential for further competition in the future, Chinese power companies are increasing their research and development efforts and increasing their research and development personnel. Since the 1990s, the power supply industry has experienced explosive development, with the number of enterprises increasing from a few hundred in the early 1990s to tens of thousands today. The production has increased from over a billion yuan in the 1990s to tens of billions of yuan today. And it is still developing rapidly.