110V / 220V power supply automatic switching circuit

摘要

The present invention relates to a 110V / 220V power supply automatic switching circuit, which is characterized in that the rectified bridge rectification element (14) for rectifying the power supply level of a commercial AC power supply, and the rated voltage for the rectified power supply level of the bridge rectification element (14). A power supply level detecting means which is set and controlled by the level of the commercial AC power supply and detects the level of the commercial AC power supply; a semiconductor switching element controlled by the detected power supply level for switching and controlling the path of the commercial AC power supply; And a triac element 25 connected to a connection point of the double voltage means for activating and controlled by the semiconductor switching element to set a power path adapted to the level of the commercial AC power source. Is maintained at the conduction state at a commercial AC power supply level of 220 V and inoperable at a power supply of 110 V, when the light emitting element 21 and the light emitting element 21 are operated. It is operated to form a path of 220V power source and when the light emitting device 21 is inoperative, it is composed of a phototriac with a light receiving element 23 which forms a path of 110V power source. It is to switch the / 220V power supply.