Full-voltage control circuit of double-channel silicon controlled rectifier air duct and air duct

The utility model relates to a double-channel silicon controlled rectifier air duct full-voltage control circuit and an air duct, which are used for controlling a heating wire of the air duct, the control circuit comprises a first control circuit, a second control circuit, a third control circuit, a fourth control circuit and a fifth control circuit, and one end of the first control circuit is connected with a control chip while the other end is connected with a first heating wire; one end of the second control circuit is connected with the control chip, and the other end of the second control circuit is connected with the second heating wire; the voltage connected to the control chip is recorded as U, and when U is larger than 110 and smaller than 220 V, the control chip switches on any one of the first control circuit and the second control circuit; and when U is less than or equal to 11V, the control chip simultaneously switches on the first control circuit and the second control circuit. Therefore, full-v