Linear isolating circuit controlled by high voltage power supply and used for electric-bag composite dedusting

A linear isolating circuit controlled by a high voltage power supply and used for electric-bag composite dedusting relates to an electric-bag composite dust remover. A pre-stage input circuit, a linear optical coupling circuit, a post-stage output circuit and an isolation power supply circuit are arranged. An input terminal of the pre-stage input circuit is externally connected with a sampling signal output terminal. An output terminal of the pre-stage input circuit is connected with an input terminal of the linear optical coupling circuit. An output terminal of the linear optical coupling circuit is connected with an input terminal of the post-stage output circuit. An output terminal of the post-stage output circuit outputs a voltage signal. The isolation power supply circuit is arranged between the pre-stage input circuit and the post-stage output circuit. A size of an optocoupler is small. The price is cheap. The isolating circuit is simple and can completely eliminate mutual interferences of the pre-stage