A bidirectional and isolated DC/DC converter connecting mobile battery systems to a DC grid in commercial buildings

2019 IEEE 4th International Future Energy Electronics Conference (IFEEC) Pub Date : 2019-11-01 DOI:10.1109/IFEEC47410.2019.9014976

Matthias Schulz, Moritz Wild, Raphaël Chacon, Bernd Wunder, M. März

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引用次数: 1

Abstract

This paper introduces a novel modulation scheme for an isolated DC/DC converter in step-down direction, which enables a wide input and output voltage range. Losses in the semiconductors on the 380 V bus side are reduced due to zero voltage switching. At charging the battery, the converter works as a buck converter. In this power flow direction the discontinuous and continuous conduction mode of the bidirectional converter are discussed. For a power flow from the safety extra low voltage respectively battery side the converter works in continuous conduction mode as a boost converter. After introducing the specification of the mobile battery application, the topology and the modulation scheme are presented. The operating behavior of the DC/DC converter and the EMI spectrum with the novel modulation scheme are shown to verify the feasibility of the proposed theory. The 500 W prototype of the converter achieves a high peak efficiency of 97.7% in step-down and of 97.5% in step-up direction.

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一种将移动电池系统连接到商业建筑直流电网的双向隔离DC/DC转换器

本文介绍了一种新颖的降压方向隔离型DC/DC变换器调制方案，该方案可实现宽输入输出电压范围。380 V母线侧半导体的损耗由于零电压开关而降低。在给电池充电时，转换器作为降压转换器工作。在此潮流方向上讨论了双向变换器的断续导通和连续导通方式。对于来自电池侧的安全特低电压电流，变换器作为升压变换器工作在连续导通模式。在介绍移动电池应用规范的基础上，给出了其拓扑结构和调制方案。通过对新调制方案下DC/DC变换器的工作特性和电磁干扰频谱的分析，验证了该理论的可行性。500w变换器样机在降压方向峰值效率为97.7%，在升压方向峰值效率为97.5%。

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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2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)

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