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 emergency power supply control system includes a main control module, a power storage module, a charge module, and a discharge module. The main control module is respectively connected to the power storage module, the charge module, and the discharge module. The charge module, the power storage module, and the discharge module are connected in sequence. The power storage module includes a power storage control unit and a power storage management unit, an input end of the power storage management unit is connected to an output end of the charge module, an output end of the power storage management unit is connected to an input end of the discharge module. The input end of the power storage management unit is connected to an output end of the power storage control unit, an input end of the power storage control unit is connected to the main control module.

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.