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关于Passive to Active Leg 与 Active to Passive Leg的疑问

在《PSFB Control Using C2000 Microcontrollers.pdf》中,Passive to Active Leg 与 Active to Passive Leg得定义如下所示:

左侧桥臂式Passive to Active Leg,右侧桥臂是Active to Passive Leg

而在DP Lib中,是这么定义的:

从死区的定义看,左侧桥臂DbAtoP ----->左侧桥臂是Active to Passive Leg


为什么这两份文档的定义是相反的呢???