公开(公告)号：US11108223B2

公开(公告)日：2021-08-31

申请号：US16413274

申请日：2019-05-15

Applicant: JOHNSON CONTROLS FIRE PROTECTION LP

Inventor： Alexandre Gouin ,  Sébastien Choquette

IPC: H02H3/08 ,  H02H3/16 ,  H02H1/00 ,  G01R19/165 ,  H03K5/24 ,  G01R31/50 ,  G01R31/08

Abstract: In an aspect, a fire detection system is described. The first detection system may include isolation circuit having an isolation switch coupled with a system line of the fire detection system and configured to isolate a first side of the system line from a second side of the system line. The isolation circuit may also include a controller coupled with the isolation switch. The controller may be configured to detect a short circuit on the system line and control the isolation switch based on a calculated impedance on the system line in response to detecting the short circuit.