Desensitization of dc power supplies to momentary ac power fluctuations

At the present time, dc power supplies generally are not designed to maintain continuous and steady voltages during momentary disturbances in their ac power-transmission-supply line. Yet, during lightning storms, or through some line fault, electrical disturbances can occur within transmission lines that tend to depress dc power-supply voltages. There are methods for desensitizing the dc power supplies to these ac disturbances. One way-if the power supply does not make use of SCRs-is to use larger capacitors in the rectifier circuit. In any event, and especially if SCRs are used, the best method for sustaining dc output power is to use an auxiliary energy-reservoir circuit.