Clarification of relationship between current ripple and power density in bidirectional DC-DC converter

2016 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2016-03-20 DOI:10.1109/APEC.2016.7468130

H. Le, K. Orikawa, J. Itoh

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引用次数: 4

Abstract

This paper clarifies the relationship between the current ripple and the power density in bidirectional DC-DC converters. In the conventional power density design method, in order to obtain the pareto-front curve of the power density and the efficiency, the current ripple is designed as constant value, whereas the switching frequency is varied. As a result, the possibilities of higher power density or higher efficiency at different current ripple are not considered. Therefore, in this paper, the current ripple is also varied in order to evaluate all the designable power density. Specifically, a design flow chart is introduced to show step-by-step how to express all the losses and the volume of the converter as functions of the current ripple. Several 1-kW prototypes are constructed in order to confirm the validity of the design flow chart. By varying the current ripple, the highest power density of 10.1 kW/dm3 with the efficiency of 98.55% is achieved at the current ripple of 60%. Furthermore, the maximum error between the calculated and experimental power density and efficiency are 19.5% and 0.22 pt. respectively.

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澄清双向DC-DC变换器中电流纹波与功率密度的关系

本文阐述了双向DC-DC变换器中电流纹波与功率密度的关系。在传统的功率密度设计方法中，为了得到功率密度和效率的帕累托前曲线，将电流纹波设计为恒定值，而开关频率是变化的。因此，没有考虑不同纹波电流下更高的功率密度或效率的可能性。因此，在本文中，电流纹波也被改变，以评估所有可设计的功率密度。具体地说，设计流程图介绍了如何一步一步地表示所有的损耗和转换器的体积作为电流纹波的函数。为了确认设计流程图的有效性，构建了几个1千瓦的原型。通过改变电流纹波，在电流纹波为60%的情况下，实现了最高功率密度10.1 kW/dm3，效率为98.55%。功率密度和效率与实验值的最大误差分别为19.5%和0.22 pt。

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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2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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