Patent ID: 7466573

Claim:
An apparatus for power supply input connection, said apparatus comprising: first and second switch modules connected to respective first second power supply inputs; first and second controller modules connected to respective said first and second power supply inputs and to a secondary power connection; first and second driver modules connected to respective said first and second controller modules and to respective said first and second switch module; wherein the first and second controller modules and the first and second driver modules put said first switch module in a first operating state when a parameter relating to said first or second power supply input is larger than a parameter relating to said secondary power connection; wherein the first and second controller module and the first or second driver module put said first switch module in a second operating state when said parameter relating to said first or second power supply input is smaller than said parameter relating to said secondary power connection; and a change of operating state of the second switching module develops prior to a change of operating state of the first switching module upon removal of the first power supply input and a change of operating state of the first switching module develops prior to a change of operating state of the second switching module upon removal of the second power supply input, whereby backfeeding associated with either of such removals is precluded.