AC-DC dual power supply module for data acquisition terminal

The utility model discloses an AC-DC dual power supply module for a data acquisition terminal. The AC-DC dual power supply module comprises a master power supply, a standby power supply, a dual power supply switching device and a switch power supply. The master power supply and the standby power supply are connected to the switch power supply through a normally open switch and a normally closed switch of the dual power supply switching device. The switch power supply is an AC-DC input and has 5V, 12V and 24V three-way outputs. The master power supply is an AC 220V power supply, and the standby power supply is a DC 220V or AC 220V power supply. An AC relay is adopted by the dual power supply switching device. The input of two power supplies is achieved through the dual power supply switching device, and thus one power supply can be automatically switched to the other power supply once the power supply breaks down. Therefore, the running reliability of the data acquisition terminal is improved. Moreover, the AC-DC dual power supply module has the characteristics of low power dissipation and low cost.