Auxiliary energy source for static inverter - has resistance with high ohmic value via which capacitance is charged at slow rate to avoid blowing of input fuse

摘要

The auxiliary circuit provides a source of reserve energy to sustain a static inverter operation during periods of power interruption. In the auxiliary circuit, there is provided a capacitance normally charged from the source of power (catenary) via a resistance. The ohmic value of the resistance assures a slow rate of charge to avoid blowing the input fuse in the event of a short in the auxiliary circuit capacitance and to permit use of the desired capacitance with a reduced voltage rating. A diode arrangement statically connects the higher of the catenary voltage or the stored energy reserve of the auxiliary circuit to the inverter.