Single-phase/three-phase full-voltage power adapter

The invention relates to a single-phase/three-phase full-voltage power adapter. The single-phase/three-phase full-voltage power adapter comprises a three-phase rectifier bridge, a voltage detection circuit and two switches. The single-phase/three-phase full-voltage power adapter is characterized in that the three-phase rectifier bridge rectifies an input single-phase-voltage or three-phase-voltage alternating current into a direct current, a neutral line is arranged at the power input end, a first terminal (A), a second terminal (B), a third terminal (C) and a neutral line (N) of three-phase power source connection are formed, and the first terminal (A) and the second terminal (B) are used as the input end of a single-phase power source at the same time; the voltage detection circuit controls combination of switching on and switching off of two switches according to the voltage range of the input end, and the voltage detection circuit is adapted to a wide voltage input range. The single-phase/three-phase full