Fault detection in self checking circuit - uses line monitoring and polarity reversal of supply to circuits via diode bridges

摘要

The power supply (6) has two connected devices (4,5) with a fault associated with device (4). In partic. each device (2,3) is connected to the power supply (6) via a diode bridge (4,5). The remote power supply (6) monitors the line voltage and reverses the polarity at the latest possible moment, if a partic. threshold value is not maintained. Pref., the polarity of the supply voltage will be cyclically reversed; also an alarm signal will be generated following a short circuit in either the circuit (1) or devices (2,3). ADVANTAGE - Detection of all simple faults.