Detector circuit locates tripped fuse in complex supply equipment - by detecting voltage on RC circuit that shunts diode in series with fuse

摘要

The detector circuit locates a tripped fuse in complex power supply equipment containing many fuses each of which is in series with a diode. Each fuse (S2) is connected to a high input impedance detector (M) and has its series diode (D2) shunted by an RC circuit (RC2). The detector responds when the fuse trips out. The fuse is coupled to a full wave rectifier bridge (G) inside the detector. The bridge output is smoothed (C) and it is electrooptically coupled (OK) to a failure indicator (SM). The bridge output also lights an LED (LD) coupled after the smoothing capacitor.