Backup power stage associated with a dual input power supply and method of operating the same

A method of operating a dual input power supply to provide primary and backup power, comprising:

• receiving primary power subject to interruption in a single stage power converter and providing therefrom DC power to a DC bus;
• conditioning said DC power in an output power stage coupled to said DC bus to develop output power for delivery to an output of said power supply;
• providing backup power during said interruption with a backup power stage comprising a bi-directional DC-DC converter couplable to a backup power source and having an output coupled to said DC bus;
• and
• restricting a reverse flow of said backup power through said single stage power converter during said interruption.

A telecommunications power plant, comprising:

• a backup power source;
• a dual input power supply having an input and an output, including:
• a single stage power converter, coupled to said input that receives primary power subject to interruption and provides therefrom DC power to a DC bus,
• an output power stage, coupled to said DC bus, that conditions said DC power for delivery to said output of said power supply, and
• a backup power stage comprising a bi-directional DC-DC converter, coupled to said backup power source and having an output coupled to said DC bus, that provides backup power during said interruption, said single stage power converter restricting a reverse flow of said backup power therethrough during said interruption;
• and
• telecommunications equipment coupled to said output of said power supply.