Uninterruptible power supply with direction of DC electrical energy depending on predetermined ratio

A method of providing redundant power to a source of DC power, comprising the steps of:

• (a) providing a source of restorable stored energy;
• and
• (b) coupling the restorable stored energy source to the DC power source in a manner to direct energy either toward the source of DC power from the source of stored energy or toward the source of stored energy from the source of DC power using a plurality of switch devices that change between open and closed states, wherein the direction of electrical energy flow depends upon the deviation of the ratio of the potential of the source of DC power and the potential of the source of stored energy from a predetermined ratio and in which the direction of DC electrical energy is independent of said states of said switch devices.

An apparatus for providing redundant power to a source of DC power, comprising:

• (a) means for providing a source of restorable stored energy;
• and
• (b) means for coupling, which includes means for transforming having a turns ratio, the restorable stored energy source to the DC power source in a manner to direct energy either toward the source of DC power from the source of stored energy or toward the source of stored energy from the source of DC power, wherein the direction of electrical energy flow depends upon the deviation of the ratio of the potential of the source of DC power and the potential of the source of stored energy from a predetermined ratio that is related to said turns ratio.