Regulated static dc to dc converter start-up means

Claim 1

In a static DC to DC converter having an output converter stage controlled by pulses from a variable phase synchronous pulse generator, the improvement wherein said variable phase synchronous pulse generator is controlled by the output of an operational amplifier having a first input connected to a reference voltage source and a second input connected to feedback means connected across the output of said DC to DC converter whereby a variation in the output of said DC to DC converter from a set level causes the output of said operational amplifier to change in a manner such that the output of said variable phase pulse generator effects the output converter stage to bring the output of the DC to DC converter back to said set level, said converter including start-up means which, during start-up of the DC to DC converter, prevents the initially high output of the operational amplifier from being applied to the variable phase synchronous pulse generator, but gradually increases the proportion of the output of the operational amplifier applied to the variable phase synchronous pulse generator until, after a short time delay, the full output of the operational amplifier is applied to the variable phase synchronous generator, said startup means comprising a diode and a capacitor connected in series combination across the output of said operational amplifier, charging means being connected to said capacitor whereby, during said time delay, the capacitor charges to a voltage equal to the output of said operational amplifier and then back-bias said diode, whereupon the full output of said operational amplifier is applied to the input of said variable phase synchronous pulse generator.