載人航天器大功率智能配電單元電磁兼容性設計

EMC design of large capacity intelligent power distribution units for manned spacecraft

摘要: 大功率智能配電單元是載人航天器的核心設備，其原理復雜，電磁兼容問題突出。文章針對大功率智能配電單元的3個主要功能模塊，分別采取吸收、濾波、元器件合理選擇、印刷電路板設計和屏蔽設計等多種措施，有效抑制了大功率智能配電單元的電磁干擾，同時解決了多個大功率DC/DC變換器并聯(lián)工作時干擾疊加的問題。經(jīng)測試驗證，優(yōu)化改進后的大功率智能配電單元的電磁兼容性能無超標點，滿足電磁兼容性設計要求。

Abstract: The large capacity intelligent power distribution unit is a kind of core equipment on manned spacecrafts. Its complex working principle involves a conspicuous issue of electromagnetic compatibility. With regard to the three main functional blocks of such a unit, the method of absorbing, filtering, and reasonable choice of components, the PCB board design and the shielding design are used, to effectively inhibit the electromagnetic interference. Meanwhile, the problem of the interference superimposition generated when high-power DC/DC converters are working in parallel is solved. The modification is verified by experiments and it is shown that there are no overrun work points, which indicates that the EMC design of the large capacity intelligent power distribution unit meets the EMC requirements.