An analysis of bidirectional superposed dual active bridge DC-DC converter with synchronous rectifier

TENCON 2010 - 2010 IEEE Region 10 Conference Pub Date : 2010-11-01 DOI:10.1109/TENCON.2010.5686356

Toshiro Hirose, Takayuki Kimura, K. Harada, H. Matsuo

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引用次数: 8

Abstract

This paper describes the principles and characteristics of a novel bidirectional superposed dual active bridge DC-DC converter with synchronous rectifier, which has a mechanism formed from two bridge-type converters that are linked through superposition in additive polarity in series. Conventionally, for an isolated dual active bridge DC-DC converter, the rated voltage of its switching elements is decided according to the DC power source voltage and load current. Therefore, as the voltage and current specifications of a DC-DC converter become higher, physical size becomes larger, conduction and switching losses increase and power efficiency reduces. To solve this problem, the authors devised the proposed DC-DC converter capable of lowering the rated voltage of switching elements, by means of sharing DC power source voltage and load current between two converters. Further, the capacity of the high frequency transformer becomes small, making the DC-DC converter more efficient and smaller. We designed and constructed a lkW DC-DC converter prototype, and conducted performance evaluation testing. As a result, a conversion efficiency of 98.2% at a rated output of lkW was obtained. A detailed analysis of power flow was also carried out, to identify the characteristics of the converter developed.

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带同步整流器的双向叠加双有源桥式DC-DC变换器分析

本文介绍了一种新型双向叠加双有源桥式同步整流器DC-DC变换器的原理和特点，该变换器是由两个桥式变换器通过加性极性串联叠加连接而成的。传统上，对于隔离式双有源桥式DC-DC变换器，其开关元件的额定电压是根据直流电源电压和负载电流确定的。因此，随着DC-DC变换器电压和电流规格的提高，其物理尺寸会变大，导通和开关损耗会增加，功率效率会降低。为了解决这一问题，作者设计了一种能够降低开关元件额定电压的DC-DC变换器，其方法是在两个变换器之间共享直流电源电压和负载电流。此外，高频变压器的容量变小，使DC-DC变换器的效率更高，体积更小。设计并搭建了lkW DC-DC变换器样机，并进行了性能评估测试。结果表明，在额定输出功率为1kw时，转换效率可达98.2%。通过对功率流的详细分析，确定了所研制的变流器的特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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TENCON 2010 - 2010 IEEE Region 10 Conference

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