The power adapter is a small portable electronic device and a power conversion device for electronic appliances. It is generally composed of components such as a housing, transformer, inductor, capacitor, control IC, and PCB board. Its working principle is to convert AC input to DC output; According to the connection method, it can be divided into wall type and desktop type. It is widely used in security cameras, set-top boxes, routers, light bars, massage machines, and other equipment.

When active voltage stabilizing components are used inside the power supply, even if the mains voltage fluctuates, the output is constant. Like small transformers on the market, such as Walkman power supplies, if the mains voltage fluctuates, the output of the power supply will not fluctuate with it.