Short-circuit isolator

Details Short-circuit isolator Short-circuit isolator

H - Electricity

02

H

H02H 3/06 (2006.01) G08B 17/00 (2006.01) H04B 3/02 (2006.01)

Patent

CA 2727483

Provided is a short-circuit isolator capable of earlier detection of recovery from short circuit of a disconnected line and reconnecting the line. The short-circuit isolator includes: a switch (SWB) for switching a connection state between a primary signal line and a secondary signal line; a short- circuit monitor circuit (B) which is connected to a primary wiring of the switch (SWB) through a resistor (RB3) as a current limiting section and connected to a secondary wiring of the switch (SWB), for detecting short circuit when a voltage of the secondary signal line is lower than a short-circuit detection threshold and detecting recovery from the short circuit when the voltage of the secondary signal line is higher than a short-circuit recovery threshold which is a voltage value lower than the short-circuit detection threshold after the short circuit is detected; and a switch control section (B) for turning off the switch (SWB) when the short circuit is detected by the short-circuit monitor circuit (B) and turning on the switch (SWB) when the recovery from the short circuit is detected by the short-circuit monitor circuit (B).

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