A high degree of freedom dc/dc converter with automatic current sharing

Abstract

The present invention provides an automatic current-sharing high-degree-of-freedom DC-CD converter. Compared to a current converter, the number of input phases and the number of gain units are adjustable, the automatic current sharing can be realized after the number of input phases and the number of gain units are changed, and control of lots of sensors and the complex control strategy design are omitted. When the automatic current-sharing high-degree-of-freedom DC-CD converter is applied to different occasions, the number of input phases and the number of gain units can be flexibly regulated, several times of gain are improved through adding one input phase or one gain unit, the ratio of the output voltage and the input voltage is m*n, wherein D is a duty ratio, and m and n are the number of input phases and the number of gain units. The automatic current-sharing high-degree-of-freedom DC-CD converter can satisfy large-scale, high-power and high-gain occasions. Compared to the current high-gain technology, the automatic current-sharing high-degree-of-freedom DC-CD converter has no a coupling inductor or an isolation transformer, and the current stress and the voltage stress of a switch and a diode are reduced so as to improve the whole work efficiency of the converter.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a high-degree-of-freedom DC / DC converter with automatic current sharing. Background technique [0002] In the prior art, there are few studies on DC / DC converters used in large-capacity and high-power transmission system applications, and most of them are isolated converters. This type of converter generally adopts the method of changing the turns ratio of the intermediate isolation transformer. To achieve high gain, the resulting complex control strategy and low energy transmission efficiency limit its application in applications such as offshore wind power, and high-frequency transformers are also heavy, occupy a large area, and have high investment costs. Therefore, there is an urgent need for a light and simple large-capacity DC / DC converter that can achieve high gain. At present, there are mainly three types of converters researched for this problem: the first one is to use switched res...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention solves the problems of the existing converters such as complex control strategy, difficulty in current sharing, unadjustable input phases, too many components, excessive voltage stress of power switches and diodes, and reduced energy conversion efficiency. Provide a high degree of freedom DC / DC converter with automatic current sharing

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