Wenzhou University

Yu Xu

Yuxing Dai

Xiang'ou Zhu

Zhiwen He

Qi Tang

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. By adopting control method and system provided herein, an output voltage of Buck circuit in primary power supply is accurately controlled, and thus large-current power supply obtains a constant output current at load end.

Large-current power supply and constant-current control method and system thereof

The present invention discloses a quick start control method and system for a Buck circuit. According to the control method and system provided by the present invention, by controlling a duty ratio of a switch of the Buck circuit within an initial start time period, i.e., a total-on (Ton) time period, at 1, an output voltage can rise at a fastest rate and a capacitor can be charged; and then, by controlling the duty ratio of the switch of the Buck circuit within a Toff time period at 0, the output voltage keeps to rise and simultaneously is stabilized at an expected value. With the adoption of the control method and system provided by the present invention, the overshoot and oscillation caused by the output voltage in a start process of the Buck circuit can be effectively reduced, and the start time of the Buck circuit is shortened.

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Wenzhou, China

Yu Xu