DC power adaptors utilize modern power electronics technology to control the time ratio of switching transistors on and off to maintain a stable output voltage. The function of the DC power adaptor is to convert the original ecological power supply (coarse power) with poor power quality, such as mains power or battery power, into a high-quality DC voltage (fine power) that meets the requirements of the equipment.
The heart of a DC power adaptor is a DC/DC converter. Therefore, the classification of DC power adaptors is dependent on the classification of DC/DC converters. That is to say, the classification of DC power adaptors is basically the same as that of DC/DC converters, and the classification of DC/DC converters is basically the classification of DC power adaptors.