Abstract: The increasing demand for more efficient high power supplies have forced to draw attention towards high frequency isolated threephase DCDC converter. Herein, a high frequency isolated threephase DCDC converter was studied, which can be used in the applications that require very low voltage conversion ratio, isolation, good regulation against load and line disturbances, and fast dynamic response. In this paper, modeling, control and design of highfrequency isolated threephase DCDC converter is carried out under asymmetrical control with fixed frequency operation and its steady state analysis is presented according to the description of the operation stages of the converter. A 750 W/5 V/150 A prototype model of proposed DCDC converter is built and tested under different operating conditions. Based on experimental results under the control method, performances of proposed converter have been investigated in view of low voltage high current applications.

Key words: Line frequency isolated rectifiers, DCDC converters, High frequency isolated, Interleaved control techniques, Asymmetrical control methods

摘要： 为了使高频三相隔离D C - D C变流器适应低电压高功率的电力需求, 研究了高频隔离三相 D C - D C变
流器, 它可以应用在较低的电压转换比, 对负载和线路干扰有良好的隔离、 调节和快速的动态响应。并且对高频隔
离三相D C - D C变流器进行了建模、 控制和设计, 在固定工作频率下变流器进行非对称控制, 根据变流器工作过程对
变流器进行稳态分析。建立了一个7 5 0W/ 5V / 1 5 0A的D C - D C变流器模型, 在不同的条件下对模型进行了测试。
实验结果表明, 所提出的低电压高电流变流器在对称控制下具有很好的应用前景。

关键词: 工频隔离整流器, D C - D C变流器, 高频隔离, 交叉控制技术, 非对称控制方法