Redundant power supply apparatus for multi-input it loads
A power system for a data center is presented, the power system including a first rack; a first power converter coupled to a first rack first input, the first power converter being configured to adjust a first output voltage of the first power converter based on a first portion of the first DC power; a second power converter coupled to a first rack second input, the second power converter being configured to provide second DC power to the first rack and to the second rack, the second power converter further being configured to adjust a second output voltage of the second power converter based on a first portion of the second DC power and a second portion of the second DC power; a first asymmetric-conductance device coupled between the first power converter and first rack; and a second asymmetric-conductance device coupled between the second power converter and first rack.
1 . A power system for a data center, the power system comprising:
a first rack having a first rack first input and a first rack second input;
a second rack having a second rack first input and a second rack second input;
a third rack having a third rack first input and a third rack second input;
a first power converter coupled to the first rack first input and the second rack first input, the first power converter being configured to provide a first portion of first DC power to the first rack and a second portion of the first DC power to the second rack, the first power converter being configured to adjust a first output voltage of the first power converter based at least in part on the first DC power, wherein the first power converter is not coupled to the third rack;
a second power converter coupled to the first rack second input and the third rack first input, the second power converter being configured to provide a first portion of second DC power to the first rack and a second portion of the second DC power to the third rack, the second power converter being configured to adjust a second output voltage of the second power converter based at least in part on the second DC power, wherein the second power converter is not coupled to the second rack;
a first asymmetric-conductance device coupled between the first power converter and the first rack;
a second asymmetric-conductance device coupled between the second power converter and the first rack.
2 . The power system of claim 1 further comprising a first droop controller coupled to the first power converter and a second droop controller coupled to the second power converter.
3 . The power system of claim 2 wherein the first droop controller is configured to control the first power converter to adjust the first output voltage based at least in part on the first DC power.
4 . The power system of claim 2 wherein the first droop controller is configured to control the first power converter to adjust the first DC power based on the first output voltage.
5 . The power system of claim 2 wherein the first droop controller is configured to control the first power converter to reduce the first output voltage as the first DC power increases and to increase the first output voltage as the first DC power decreases.
6 . The power system of claim 2 wherein the second droop controller is configured to control the second power converter to adjust the second output voltage based at least in part on the second DC power.
7 . The power system of claim 6 wherein the second droop controller is configured to control the second power converter to adjust the second DC power based on the second output voltage.
8 . The power system of claim 7 further comprising:
a third power converter coupled to the second rack second input and third rack second input, the third power converter configured to provide a first portion of third DC power to the second rack and a second portion of the third DC power to the third rack, the third power converter being configured to adjust a third output voltage of the third power converter based at least in part on the third DC power, wherein the third power converter is not coupled to the first rack;
a fifth asymmetric-conductance device coupled between the third power converter and the second rack; and
a fourth asymmetric-conductance device coupled between the third power converter and the third rack.
9 . The power system of claim 8 wherein the third power converter includes a third droop controller configured to control the third power converter to reduce the third output voltage as the third DC power increases and to increase the third output voltage as the third DC power decreases.
10 . The power system of claim 8 further comprising:
one or more non-transitory computer-readable media containing thereon instructions for instructing one or more droop controllers, the instructions instructing:
the first droop controller to control the first DC power converter to output the first output voltage, determine the first DC power associated with the first output voltage, and responsive to the first DC power increasing, decreasing the first output voltage;
the second droop controller to control the second DC power converter to output the second output voltage, determine the second DC power associated with the second voltage, and responsive to the second DC power increasing, decreasing the second output voltage.
11 . The power system of claim 10 wherein the instructions further instruct a third droop controller to
control the third DC power converter to output the third output voltage,
determine the third DC power associated with the third voltage, and
responsive to the third DC power increasing, decreasing the third output voltage.
12 . The power system of claim 6 wherein the second droop controller is configured to control the second power converter to reduce the second output voltage as the second DC power increases and to increase the second output voltage as the second DC power decreases.
13 . The power system of claim 1 further comprising:
a third asymmetric-conductance device coupled between the first power converter and the second rack; and
a fourth asymmetric-conductance device coupled between the second power converter and the third rack.
14 . The power system of claim 1 wherein each of the first rack and second includes a plurality of subracks coupled in parallel with one another relative to a power converter.