Patent ID: 7265458

Claim:
A power supply apparatus, comprising: an uninterruptible power supply (UPS) having an input configured to be coupled to a first power source and an output configured to be coupled to a load; a first static switch configured to provide a switchable bypass path from the first power source to the load; a second static switch controllable to provide a switchable path between the load and a second power source other than the UPS; and a controller circuit configured to cooperatively control the first and second static switches to transfer the load to the second power source, wherein the controller circuit is operative to transition the load from a first state wherein the load receives power from the first power source via the first static switch to a second state wherein the load receives power from the second power source while isolated from the first power source, and wherein the UPS comprises a first UPS having an output configured to be coupled to a first load, and wherein the apparatus further comprises a second UPS having an input configured to be coupled to the second power source and an output configured to be coupled to a second load and a third static switch controllable to provide a switchable bypass path between the second power source and the second load, wherein the controller circuit is further configured to control the first and second static switches to transition the first load from the first state to the second state, and wherein the first load in the second state receives power from the second power source via the second UPS and/or the third static switch while isolated from the first power source.