Power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances, which is generally composed of shell, transformer, inductor, capacitor, control IC, PCB board and other components. Its working principle is to convert AC input into DC output. According to the connection mode, it can be divided into wall-inserting type and desktop type. Widely used in security cameras, set-top boxes, routers, light bars, massagers and other equipment. Power adapter, also called external power supply, is a power supply voltage conversion device for small portable electronic devices and electronic appliances, which is commonly used in small electronic products such as mobile phones, LCD monitors and notebook computers. With the development of the times and the progress of society, the application of power adapter is more and more extensive. 1. With the implementation of the national energy conservation and emission reduction policy, LED energy-saving lamps have been accepted by consumers, and their brightness and energy-saving effect are acceptable to people. In this case, the usage of power supply adaptation will definitely increase further. There are more than one billion people in China, and their lighting consumption is a huge number, so is the use of power adapters. Second, there are power adapters in many household appliances. We know that the power adapter plays the most important role in the use of computer LCD. Many electronic devices can't be used at normal mains voltage, so a power adapter must be used. The normal operation of LCD is also inseparable from the power adapter. Third, electronic products have flooded our lives. In daily life, the use of mobile phones, tablet computers and notebook computers is gradually increasing. At this time, the use of power adapters is also increasing. It can be said that the market development of digital products has promoted the development of power adapter industry. The huge user base is the foundation of the industry development. With the rapid development of science and technology, the explosive growth of various electronic products will definitely lead to the vigorous development of affiliated industries, and the power adapter, as the basis for the operation and use of these electronic products, has irreplaceable functions. It is doomed that the market of power adapter will expand with the continuous expansion of electronic products market, and high-quality power adapter will become the first choice of consumers. After all, power adapter is not a disposable product, and only by ensuring the quality will it be recognized by consumers. This is the premise of the development of the power supply market, and it is also a problem that every power adapter manufacturer needs to pay attention to. It is an eternal truth to survive by quality and develop by innovation.