Abstract: A multi-channel alternating current conversion circuit, a power supply apparatus and an electronic device are disclosed. The multi-channel alternating current conversion circuit includes an AC input terminal, an AC-AC conversion unit, an AC-AC voltage reduction unit and an AC-DC voltage reduction unit. The AC-AC conversion unit includes a thyristor voltage reduction circuit, a no-load freewheeling voltage stabilizing circuit and a first AC output terminal. The AC input terminal is connected to an input terminal of the thyristor voltage reduction circuit and an input terminal of the no-load freewheeling voltage stabilizing circuit. An output terminal of the thyristor voltage reduction circuit and an output terminal of the no-load freewheeling voltage stabilizing circuit are connected to an output terminal of the first AC output terminal.

Abstract: An alternating current step-down circuit comprises an AC input, a DC output, an AC output, a full-bridge rectification and filtering circuit, a flyback step-down circuit, a DC-DC step-down unit and an inverting unit. The AC input is connected with an input of the full-bridge rectification and filtering circuit; an output of the full-bridge rectification and filtering circuit is connected with an input of the flyback step-down circuit and an input of the DC-DC step-down unit, respectively; an output of the flyback step-down circuit is connected with the DC output, the input of the DC-DC step-down unit and an input of the inverting unit, respectively; an output of the DC-DC step-down unit is connected with the input of the inverting unit; and an output of the inverting unit is connected with the AC output.

Abstract: An AC-AC conversion circuit with AC-AC conversion control and AC voltage conversion including a voltage feedback circuit, a voltage detection circuit, a first drive circuit, a current detection circuit, a second drive circuit and a main control circuit. By using the main control circuit as the main control center, which has strong reliability and good circuit stability, the defects of complicated circuit structure and low reliability, and poor stability of the supply circuit in the existing AC-AC conversion circuit may be overcome. Also disclosed is an AC-AC conversion device which has good stability due to the highly reliable AC-AC conversion circuit thereof.

Abstract: An alternating current step-down circuit comprises an AC input, a DC output, an AC output, a full-bridge rectification and filtering circuit, a flyback step-down circuit, a DC-DC step-down unit and an inverting unit. The AC input is connected with an input of the full-bridge rectification and filtering circuit; an output of the full-bridge rectification and filtering circuit is connected with an input of the flyback step-down circuit and an input of the DC-DC step-down unit, respectively; an output of the flyback step-down circuit is connected with the DC output, the input of the DC-DC step-down unit and an input of the inverting unit, respectively; an output of the DC-DC step-down unit is connected with the input of the inverting unit; and an output of the inverting unit is connected with the AC output.

Abstract: Disclosed is an alternating current conversion circuit including an AC input end, an AC output end, an intelligent conversion circuit, a voltage sampling circuit and a master control circuit. The intelligent conversion circuit is configured to output a standard voltage inputted by the AC input end to the AC output end, and convert a non-standard voltage inputted by the AC input end into a standard voltage and output the standard voltage converted to the AC output end, under the control of the master control circuit. The voltage sampling circuit is configured to sample the voltage inputted by the AC input end and the voltage outputted by the intelligent conversion circuit. The invention provides an intelligent AC conversion, allowing the electronic devices which are designed for a single power grid to be adapted to various power grids.