IPM自举电路设计过程中的关键问题研究

Some key issues in the research process of bootstrap circuit design of IPM

介绍了IPM自举电路的基本拓扑结构和原理,并在理论分析的基础上,研究和探讨了自举电阻、自举二极管和自举电容的选型方法,重点对自举电容初始充电展开研究,提出了一种简单实用的初始充电方法,在实际项目应用中取得良好的充电效果。实验结果表明,这种初始充电方法简单、实用、安全可靠,解决了初始充电可能导致IPM上下管直通的问题。

This paper introduced the basic topology structure and principle of a bootstrap circuit of IPM, and on the basis of the- oretical analysis and research, explored the application sizing method of bootstrap capacitance, bootstrap resistance and bootstrap diode, especially focus on the initial charge problem of bootstrap capacitance. Then provide a simple and practical way to achieve the initial charge, and the method made good charging effect in practical project application. Experiments demonstrate that the initial charging method is simple, practical and reliable, and there is inexistent risk of break-though of the bridge caused by initial charge.