220 V power source electronic voltage step-down device

A 220 V power source electronic voltage step-down device is disclosed and comprises an adjustable voltage step-down rectifying circuit which is externally connected with the mains supply, an output end of the adjustable voltage step-down rectifying circuit is electrically connected with an input end of a one-chip microcomputer, the 220 V power source electronic voltage step-down device also comprises a control box and a silicon controlled rectifier trigger circuit, the control box is provided with a wave band switch, an output end of the one-chip microcomputer is electrically connected with an input end of the wave band switch, the control box is connected with power source plug head through a power source line, the outer surface of the control box is provided with a socket used for connecting with an electricity consuming load plug head, a moving contact head of the wave band switch is connected with a silicon controlled rectifier control end of the silicon controlled rectifier trigger circuit, an input end of the silicon controlled rectifier trigger circuit is externally connected with the mains supply, and the wave band switch is provided with a plurality of voltage gears. The 220 V power source electronic voltage step-down device is simple in structure and reliable in work. Through use of the 220 V power source electronic voltage step-down device, an electronic product such as a television, a neon light, a lamp box, sound equipment and the like can work at a power source voltage less than 220 V; heating intensity of the electronic product can be lowered, a fault occurrence rate can be reduced, service life can be prolonged and good energy saving benefits can be realized.