Switching power supply, also known as Power Supply Source Adapter, is a high-frequency electric energy conversion device and a type of power supply. Its function is to convert a level of voltage into the voltage or current required by the user through different forms of architecture. The input of the switching power supply is mostly AC power (such as commercial power) or DC power, and the output is mostly equipment that requires DC power, such as personal computers, and the switching power supply converts the voltage and current between the two.