High-efficiency low-voltage large-capacity direct-current power supply and control method thereof

Abstract

The invention discloses a high-efficiency low-voltage large-capacity direct current power supply and a control method thereof, the high-efficiency low-voltage large-capacity direct current power supply comprises an AC / DC converter, a plurality of groups of DC / DC converters and controllers thereof, each DC / DC converter comprises two groups of single-phase half-bridge synchronous rectification circuits, and each single-phase half-bridge synchronous rectification circuit comprises a single-phase half-bridge intermediate-frequency DC / AC circuit, an intermediate-frequency transformer and a synchronous rectification and driving circuit. The AC / DC converters rectify AC voltage into first DC voltage, the input ends of the multiple sets of DC / DC converters are cascaded to share the first DC voltage into multiple sets of second DC voltage, and the output ends of the multiple sets of DC / DC converters are connected in parallel to form third DC voltage. The controller controls two-phase orthogonal output of the two single-phase half-bridge intermediate-frequency DC / AC circuits in each group of DC / DC converters, and staggered output of different groups of DC / DC converters is realized. The intermediate frequency transformer realizes voltage grade conversion. And the synchronous rectification and driving circuit realizes intermediate-frequency alternating-current rectification. The synchronous rectification technology and the direct current cascade and two-phase orthogonal output strategy are adopted, the control frequency is not high, the output direct current voltage ripple is low, and the system efficiency and the cost performance can be improved.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a high-efficiency low-voltage large-capacity DC power supply and a control method thereof. Background technique [0002] Low-voltage large-capacity DC electrolytic power supplies are widely used in electrolysis, electroplating and other electrochemical-related industries. Electrolysis of different metals requires different voltage levels, and there are strict restrictions on the magnitude of DC voltage ripple. Providing high-quality DC electrolysis power supply is a necessary condition for obtaining high-quality metal electrolysis products. At present, in order to obtain a high-quality DC electrolytic power supply, there are mainly the following different schemes: directly use a fully controlled rectifier circuit or a DC step-down circuit to provide power supply, and reduce the output voltage ripple by increasing the operating frequency of the switching device; use...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of large loss and complex structure in the current technology and improve the cost performance of the system, the present invention proposes a high-efficiency low-voltage large-capacity DC power supply and its control method

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