Patent ID: 8593113

Claim:
A system for backup power supply, the system comprising: a backup power supply circuit comprising: a supercapacitor for backing up a potential node; an inductor coupled between a first terminal of the supercapacitor and the potential node, the inductor operating in a bi-directional mode to charge and discharge the supercapacitor; a first switch connected in a first parallel circuit with a first diode, the first parallel circuit coupled between the inductor and the potential node; and a second switch connected in a second parallel circuit with a second diode, the second parallel circuit coupled between the inductor and a second terminal of the supercapacitor, the first switch being used to modulate flow of current from a power source to the supercapacitor via the inductor when the power source is available at the potential node, and the second switch being used to modulate flow of current from the supercapacitor to the potential node via the inductor when the power source is lost at the potential node.