公开(公告)号：US20180261999A1

公开(公告)日：2018-09-13

申请号：US15462913

申请日：2017-03-20

申请人： NXP USA, INC.

发明人： CHANGHAO SHI ,  RUI LV ,  DECHANG WANG

IPC分类号： H02H7/04 ,  H02H3/20 ,  H02H7/045 ,  G01R31/02

CPC分类号： H02H7/042 ,  G01R31/027 ,  H02H3/20 ,  H02H7/045

摘要： An apparatus for detecting disconnection of a secondary side of a current transformer includes a sampling circuit coupled to the secondary side of the current transformer that samples signals from the secondary side of the current transformer. A pull-up circuit is switchably coupled to the sampling circuit in response to a coupling signal in a diagnostic phase. A processor is coupled to the sampling circuit for receiving sampled signals from the sampling circuit. The processor extracts corresponding signal information from the sampled signals and stores the extracted signal information in a memory. The extracted signal information corresponds to statuses that the secondary side of the current transformer is connected or disconnected to a load. A detector is coupled to the processor and the memory, and accesses the memory using the signal information of the sampled signals.