Large-capacity high-boost isolated DC-DC converter with adjustable number of bridge arms

Abstract

The invention provides a large-capacity high-boost isolated DC-DC converter with an adjustable number of bridge arms. If the converter is configured to have m bridge arms, the converter comprises a DCinput voltage source and m bridge arms, each bridge arm comprises two power switches, a DC power supply is connected to the upper and lower sides of the bridge arms, two capacitors C1, C2 and 2m high-frequency transformers T1, T2, T3...T2m having a transformation ratio of 1: N are connected in parallel, n high-boost gain units, a load RL, a filter capacitor C0 and a diode D0 are provided at the other end of the transformers, the gain unit 1 in the high-boost gain units includes 2m-1 capacitors and diodes, and the remaining gain units include 2m capacitors and diodes. Compared with the existing bridge-type isolated DC / DC converter, the number of the bridge arms can be freely adjusted, the current of each input phase is automatically equalized, the input and output gains are high and adjustable, and the voltage and current stress of the switch device are low and also adjustable, so the large-capacity high-boost isolated DC-DC converter can be applied to large-capacity high-boost applications that require electrical isolation.

Description

technical field [0001] The invention relates to a bridge-based large-capacity, high-boost DC / DC converter, in particular to a large-capacity, high-boost isolated DC-DC converter with adjustable bridge arms. Background technique [0002] In recent years, due to the continuous expansion of wind farm scale and offshore distance in offshore wind power DC confluence and transmission technology, the DC confluence field usually requires tens of times or even higher voltage gain, and the processed power capacity is as high as several megabytes. Watts are even higher, and the existing solutions are difficult to apply, and converters with higher gain and capacity are required. [0003] On the one hand, the output voltage gain of the currently studied converters is usually achieved by enlarging the turns ratio of the primary and secondary windings of the transformer. However, the design and manufacture of large-capacity high-turn ratio high-frequency transformers are difficult. It is ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the prior art that the number of input phases of the converter cannot be adjusted, the voltage and current stress is too high, the input and output gain is low, and the voltage stress of the diode on the rectification side is high, the present invention proposes a large-capacity high-boost converter with adjustable bridge arms Isolated DC-DC Converter

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