Smart meters and instruments are important terminal products of smart grids, and their market penetration rate has gradually increased in recent years. As an essential household item, smart meters operate 24 hours a day to record users' electricity consumption data. It requires semiconductor discrete devices such as diodes and bridge rectifiers internally to achieve data processing in the circuit. Therefore, with the rapid development of the smart meter market, it is expected to drive the growth of market demand for semiconductor discrete device products.