文章列举了航天器二次电源中常用的冗余设计方式,并针对某航天器热备份冗余二次电源在轨出现的“备压主”现象进行了详细分析,说明了其产生的机理,并通过多个产品的地面试验进行了验证和分析,对热备份冗余二次电源的工作模式有了进一步的认知,指出“备压主”是这种冗余设计方式的一种特定工作模式,而非产品故障。 This paper lists the redundant design methods commonly used in the secondary power supply of spacecraft and analyzes the phenomenon of “backup pressure main” appearing on the orbit of a hot backup redundant secondary power supply of a spacecraft, Mechanism, and through a number of products on the ground test was verified and analyzed on the hot standby redundant secondary power supply mode of operation has been further recognized, pointed out that “backup main” is a redundant design approach A specific mode of operation, not a product failure.