Patent ID: 7307360
Filing Date: 2007-12-11
Classification: G06F,H02J,Y02B

Abstract:
1. An uninterruptible power supply (UPS) for supplying power to a personal computer, the UPS comprising: a charging unit connected to a rechargeable battery comprising a battery output, a control circuit for providing power from the battery output to the personal computer when receiving AC power from a utility grid; a fuel cell stack comprising a fuel cell output connected to a three-way switch and in parallel with the rechargeable battery with a blocking diode located between the battery output and the fuel cell output to block the battery output when the fuel cell output is greater than the battery output, wherein a DC-AC inverter is absent from the UPS, wherein the UPS is configured to output DC power and connect to the personal computer; and wherein the three-way switch is connected to the battery output and to a resistive load to rehydrate the fuel cell to bring the fuel cell to normal power output.