Abstract: The present invention discloses a large-current power supply and a constant-current control method and system thereof. The large-current power supply provided by the present invention includes: a primary power supply, an energy-feedback circuit and a direct-current (DC) large-current generator; the energy-feedback circuit includes a freewheel diode and a magnetic reset winding; and a secondary coil of the DC large-current generator is connected to a load. Without an output rectifier diode and a filter capacitor at a load end of the large-current power supply provided by the present invention, the power consumption problem of the output rectifier diode at a large current is unnecessarily considered, and an electrolytic capacitor does not need to be used for filtration; and therefore, the service life of the power supply is greatly prolonged, a larger current is output easily by extending, and the power supply has the advantages of simple circuit, small size, easy control and high working reliability.

Abstract: Disclosed is a system and method for large-current power supply and constant-current control. Large-current power supply includes: primary power supply, energy-feedback circuit and direct-current (DC) large-current generator; energy-feedback circuit includes freewheel diode and magnetic reset winding; and secondary coil of DC large-current generator is connected to load. Without output rectifier diode and filter capacitor at load end of large-current power supply provided herein, power consumption problem of output rectifier diode at large current is unnecessarily considered, and electrolytic capacitor is not needed for filtration; and therefore, service life of power supply is greatly prolonged, larger current is output by extending, and power supply has advantages of simple circuit, small size, easy control and high working reliability.