According to the power supply voltage, there are: wide voltage power supply, narrow voltage power supply; according to input and output: isolated power supply, non-isolated power supply.
Narrow voltage power supply: The so-called narrow voltage is actually relative, and the narrow voltage range is mostly: 185-265V. Some say 85-180V.
Wide voltage power supply: The so-called wide voltage refers to the voltage that can adapt to the normal operation of most countries. Generally speaking, the range of wide voltage is: 85V-265V.
Isolated power supply: Generally speaking, the isolated power supply means that the mains and the********* power supply device are not directly connected, but are powered by the transformer before being supplied to the********* electronic device. The safety performance is higher, but because the circuit is slightly more complicated, the conversion efficiency of the isolated power supply is lower than that of the non-isolated power supply. The conversion efficiency is generally about 85%.