On-state power taking circuit, intelligent single-live-wire switch module and intelligent single-live-wire switch

The embodiment of the invention provides an on-state power taking circuit, an intelligent single-live-wire switch module and an intelligent single-live-wire switch, wherein the on-state power taking circuit comprises a power taking input end, a power taking output end, a first rectification circuit, a second rectification circuit and a comparison circuit. When comparison circuit outputs first level signal, in full cycle of alternating current, a first electricity taking loop is formed between the electricity taking input end and the electricity taking output end through the first rectifying circuit and the second rectifying circuit to take electricity; and when the comparison circuit outputs a second level signal, a second electricity taking loop is formed between the electricity taking input end and the electricity taking output end through the first rectifying circuit to take electricity in the negative half cycle of the alternating current; and in the positive half period of the alternating current, a thir