A bidirectional isolated DC-DC converter as a core circuit of the next-generation medium-voltage power conversion system
A bidirectional isolated DC-DC converter as a core circuit of the next-generation medium-voltage power conversion system
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DOI：
10.1109/tpel.2006.889939
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发表时间：
2007-03-01
影响因子：
6.7
通讯作者：
Akagi, Hirofumi
中科院分区：
文献类型：
--
作者：
Inoue, Shigenori;Akagi, Hirofumi
本文介绍了一种双向隔离式直流 - 直流转换器，它被视为下一代3.3千伏/6.6千伏高功率密度功率转换系统的核心电路。该直流 - 直流转换器旨在采用基于碳化硅（SiC）和/或氮化镓的功率开关器件，这些器件在不久的将来将投放市场。设计、搭建并测试了一款350伏、10千瓦、20千赫兹的直流 - 直流转换器。它由两个采用最新沟槽栅绝缘栅双极型晶体管的单相全桥转换器，以及一个采用纳米晶软磁材料磁芯和利兹线的20千赫兹变压器组成。该变压器在实现两个全桥转换器之间的电气隔离方面起着至关重要的作用。精确测量得出，从直流输入到直流输出端的总效率高达97%（计算总损耗时未计入栅极驱动和控制电路的损耗）。此外，还进行了损耗分析，以评估使用碳化硅基功率开关器件的有效性。损耗分析表明，使用碳化硅基功率器件可显著降低直流 - 直流转换器的导通损耗和开关损耗。因此，总效率有望达到99% 甚至更高。
This paper describes a bidirectional isolated dc-dc converter considered as a core circuit of 3.3-kV/6.6-kV high-power-density power conversion systems in the next generation. The dc-dc converter is intended to use power switching devices based on silicon carbide (SiC) and/or gallium nitride, which will be available on the market in the near future. A 350-V, 10-kW and 20 kHz dc-dc converter is designed, constructed and tested. It consists of two single-phase full-bridge converters with the latest trench-gate insulated gate bipolar transistors and a 20-kHz transformer with a nano-crystalline soft-magnetic material core and litz wires. The transformer plays an essential role in achieving galvanic isolation between the two full-bridge converters. The overall efficiency from,the dc-input to dc-output terminals is accurately measured to be as high as 97%, excluding gate drive and control circuit losses from the whole loss. Moreover, loss analysis is carried out to estimate effectiveness in using SiC-based power switching devices. Loss analysis clarifies that the use of SiC-based power devices may bring a significant reduction in conducting and switching losses to the dc-dc converter. As a result, the overall efficiency may reach 99% or higher.