一种全桥直流变压器抑制偏磁方法研究

Research on a Method of Suppressing Magnetic Bias in Full-Bridge DC Transformer

随着大功率直流输电和直流分布式供电系统的发展,直流变压器得到了广泛应用和研究。在最大占空比下,直流变压器中高频变压器偏磁问题影响着直流变压器工作。因此,在简述功率变压器偏磁产生机理的基础上,研究了一种带偏置电压互补驱动偏磁抑制闭环控制方法。该方法不但能够实现尽可能大的占空比,而且能够抑制变压器偏磁。实验结果表明,该偏磁抑制方法是正确可行的。

With the development of high-power DC transmission and DC distributed power supply system,DC transformer has been widely used and studied. At the maximum duty cycle,the magnetic bias of medium and high frequency transformers affects the operation of DC transformers. Therefore,based on a brief description of the mechanism of magnetic bias in power transformer,a closed-loop control method of magnetic bias suppression driven by complementary bias voltage is studied. This method can not only achieve the maximum duty cycle,but also restrain the magnetic bias of transformer. The experimental results show that the method is correct and feasible.