The field of power supply and charger is an important application area for semiconductor discrete devices. As an important accessory of smart electronic products, chargers charge devices through AC/DC conversion, making them portable and easy to use. In recent years, with the rapid development of smart electronic devices, especially smartphones, the demand for charger products has continued to grow. Semiconductor discrete devices, as the main components of chargers, still have huge market development space in the future. In addition, as the power source of electronic devices, semiconductor discrete devices play a role in rectification and voltage regulation in power adapters, and also realize the conversion of industrial power supplies.