Unintteruptible power supply systems and methods employing on-demand energy storage
AssigneeEaton Corporation
InventorsJoseph Charles Paulakonis, Pradeep Kumar Nandam
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Abstract
An uninterruptible power supply (UPS) system includes first and second busses, a first switching circuit configured to selectively couple an AC source to the first and second busses and a second switching circuit configured to selectively couple the first and second busses to a load. The system also includes a storage capacitor and a third switching circuit configured to couple the storage capacitor between the first and second busses. The system further includes a control circuit configured to control the first, second and third switching circuits to generate an AC voltage at the load.
Claims20
An uninterruptible power supply (UPS) system comprising:
- first and second busses;
- a first switching circuit configured to selectively couple an AC source to the first and second busses;
- a second switching circuit configured to selectively couple the first and second busses to a load;
- a storage capacitor;
- a third switching circuit configured to couple the storage capacitor between the first and second busses;
- and
- a control circuit configured to control the first, second and third switching circuits to generate an AC voltage at the load.
A UPS system comprising:
- a boost rectifier circuit having an input port configured to be coupled to an AC source;
- first and second busses coupled to an output port of the boost rectifier circuit;
- a first capacitor having a first terminal coupled to the first bus and a second terminal coupled to the second bus;
- a buck converter circuit having an input port coupled to the first and second busses and an output port configured to be coupled to a load;
- an inverter circuit configured to selectively couple the first and second busses to a neutral to generate an AC output at the output of the buck converter circuit;
- a second capacitor having a substantially greater capacitance than the first capacitor;
- and
- a switching circuit configured to couple and decouple the second capacitor to and from at least one of the first and second busses responsive to a state of the AC source.
A method of operating a UPS system comprising a first switching circuit configured to selectively couple an AC source to first and second busses and a second switching circuit configured to selectively couple the first and second busses to a load, the method comprising
- detecting a state of the AC source;
- and
- coupling a storage capacitor between the first and second busses responsive to the detected state of the AC source.
Dependencies are inferred from the claim text.