Patent ID: 8788109

Claim:
A power system comprising: a bridge to convert alternating current to direct current, wherein the bridge has input terminals and output terminals, wherein the inputs are configured to be coupled to a utility grid; a first capacitor having a first terminal and a second terminal, wherein the first terminal of the first capacitor is coupled to an output terminal of the bridge, and the second terminal of the first capacitor is coupled to ground; a second capacitor having a first terminal and a second terminal, wherein the first terminal of the second capacitor is coupled to the second terminal of the first capacitor and ground, and the second terminal of the second capacitor is coupled to another output terminal of the bridge; a first switch coupled to first terminal of the first capacitor; a second switch coupled to the second terminal of the second capacitor; a main electrical energy storage unit having first and second input terminals and first and second output terminals, wherein: the first input terminal of the main electrical energy storage unit is coupled to the first switch; the second input terminal of the main electrical energy storage unit is coupled to the second switch; and the main electrical energy storage unit includes an electrical energy storage unit comprising a first dielectric layer disposed between first and second electrode layers, the first dielectric layer comprising a high permittivity ceramic material; a backup electrical energy storage unit having a first output terminal and a second output terminal; a third switch coupled to first output terminal of the backup electrical energy storage unit; a fourth switch coupled to the second output terminal of the backup electrical energy storage unit; an electrical energy storage unit buffer coupled to the first and second output terminals of the main electrical energy storage unit and the third and fourth switches; an output coupled to the electrical energy storage unit buffer; a control computer configured to determine that the electrically energy storage unit buffer has a sufficient charge, and in response to determining that the electrically energy storage unit buffer has a sufficient charge, to control the first and second switches to deactivate the main electrical energy storage unit, and to control the third and fourth switches to activate the backup energy storage unit.