Circuit for bridging supply failures for circuits with switching regulators, especially step-down converters, discharges buffer capacitor via switching regulator input if voltage drops

摘要

The circuit has electronic circuit elements that amplify the voltage at one point in the circuit in unregulated manner with constant gain and feed it to a buffer capacitor(s) (6) as a charging voltage; the amplified voltage lies between the maximum operating voltage and the switching regulator input voltage. Other elements detect a drop in the operating voltage and enable a discharge of the buffer capacitor via the switching regulator input.