Patent ID: 6774602
Filing Date: 2004-08-10
Classification: H02J

Abstract:
A backup power supply for an electrical device, comprising:a storage medium for holding an electrical charge being configured to be connected and disconnected from the electrical device; a source of intermittent power coupled to a power supply and the electrical device, said source of intermittent power being configured to provide an amount power to the electrical device for a period of time long enough to connect said storage medium to the electrical device; an operating system for determining whether the electrical device requires power from said storage medium, said operating system comprises a controller employing a control algorithm for determining whether the backup power supply is in one of a plurality of states; said plurality of states comprises a discharge state, a float state and a recharge state; and wherein said operating system monitors the current of said source of intermittent power and if said current of said source of intermittent power supply exceeds a predetermined limit said operating system couples said storage medium to said electrical device and the backup power supply is in said discharge state, wherein said source of intermittent power is a plurality of capacitors connected to each other in series.