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1. (WO2018042328) CONTROL CIRCUIT CONFIGURED TO DETERMINE WHEN A DIRECT CURRENT COMPONENT IN AN ALTERNATING CURRENT POWER LINE PASSES A DESIGNATED THRESHOLD

Pub. No.:    WO/2018/042328    International Application No.:    PCT/IB2017/055179
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 30 01:59:59 CEST 2017
IPC: H02H 3/33
H02H 3/50
Applicants: TE CONNECTIVITY CORPORATION
Inventors: MISHRIKEY, Matthew D.
Title: CONTROL CIRCUIT CONFIGURED TO DETERMINE WHEN A DIRECT CURRENT COMPONENT IN AN ALTERNATING CURRENT POWER LINE PASSES A DESIGNATED THRESHOLD
Abstract:
Control circuit 110 includes a current sensor 112 that is configured to detect alternating current transmitted through a power line 104. The alternating current includes an alternating current (AC) component and a direct current DC offset component. The control circuit 110 also includes a filter sub-circuit 114 that is configured to receive a sensor output from the current sensor 112 that is representative of the AC component and the DC component. The AC component has a frequency higher than a frequency of the DC component. The filter sub-circuit 114 is configured generate a DC output that is based on the DC component. The control circuit 110 also includes an analysis sub-circuit 122 that is configured to receive the DC output and determine that the DC output has passed a designated threshold. The analysis sub-circuit 122 is configured to trip a relay or output a signal when the DC output passes the designated threshold.