3-phase high power ups
AssigneeAmerican Power Conversion Corporation
InventorHenning Roar Nielsen
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Abstract
According to one aspect, embodiments of the invention provide a UPS comprising a plurality of electrical buses, a first AC/DC converter coupled to the electrical buses and configured to convert a first input AC voltage to a plurality of DC voltages, a second AC/DC converter coupled to the electrical buses and configured to convert a second input AC voltage to the plurality of DC voltages, a third AC/DC converter coupled to the electrical buses and configured to convert a third input AC voltage to the plurality of DC voltages, a first DC/AC converter configured to convert the plurality of DC voltages into a first output AC voltage, and a DC bus balancer configured to maintain voltages present on the electrical buses by transferring energy between the plurality of electrical buses.
Claims21
An uninterruptible power supply (UPS) comprising:
- a plurality of electrical buses;
- a first AC/DC converter coupled to the electrical buses and configured to receive a first input AC voltage and to convert the first input AC voltage to a plurality of DC voltages, the first AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;
- a second AC/DC converter coupled to the electrical buses and configured to receive a second input AC voltage and to convert the second input AC voltage to the plurality of DC voltages, the second AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;
- a third AC/DC converter coupled to the electrical buses and configured to receive a third input AC voltage and to convert the third input AC voltage to the plurality of DC voltages, the third AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;
- a first DC/AC converter coupled to the plurality of electrical buses and configured to receive the plurality of DC voltages and to convert the plurality of DC voltages into a first output AC voltage;
- and
- a DC bus balancer configured to maintain voltages present on the electrical buses at desired levels, the DC bus balancer being configured to transfer energy between the plurality of electrical buses.
The UPS of claim 50 wherein:
- the DC/DC converter is configured to convert the plurality of DC voltages to the battery DC voltage when the first, second, and third input AC voltages are within a predetermined range;
- and
- the DC/DC converter is configured to convert the battery DC voltage to the plurality of DC voltages when the first, second, and third input AC voltages are not within the predetermined range.
The UPS of claim 50 wherein a battery is coupled to the DC/DC converter and is configured to:
- receive and be charged by the battery DC voltage;
- and
- convey the battery DC voltage to the DC/DC converter.
-49. (canceled)
A method for providing uninterruptible power to a load, the method comprising:
- receiving a first, second and third input AC voltage;
- converting, with a first AC/DC converter, the first input AC voltage into a plurality of DC voltages;
- converting, with a second AC/DC converter, the second input AC voltage into the plurality of DC voltages;
- converting, with a third AC/DC converter, the third input AC voltage into the plurality of DC voltages;
- providing, with the first, second and third AC/DC converters, the plurality of DC voltages to a plurality of electrical buses;
- converting, with a first DC/AC converter, the plurality of DC voltages from the plurality of electrical buses into a first output AC voltage;
- and
- transferring energy, with a DC bus balancer, between the plurality of electrical buses to maintain voltages present on the plurality of electrical buses at desired levels.
An uninterruptible power supply (UPS) comprising:
- a plurality of electrical buses;
- a first AC/DC converter coupled to the electrical buses and configured to receive a first input AC voltage and to convert the first input AC voltage to a plurality of DC voltages, the first AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;
- a second AC/DC converter coupled to the electrical buses and configured to receive a second input AC voltage and to convert the second input AC voltage to the plurality of DC voltages, the second AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;
- a third AC/DC converter coupled to the electrical buses and configured to receive a third input AC voltage and to convert the third input AC voltage to the plurality of DC voltages, the third AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;
- a first DC/AC converter coupled to the plurality of electrical buses and configured to receive the plurality of DC voltages and to convert the plurality of DC voltages into a first output AC voltage;
- and
- means for transferring energy between the plurality of electrical buses to maintain voltages present on the electrical buses at desired levels.
Dependencies are inferred from the claim text.