Unintteruptible power supply systems and methods employing on-demand energy storage
First Claim
Patent Images
1. 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;
a fourth switching circuit configured to couple an auxiliary power source to the first and second busses; and
a control circuit configured to control the first, second, third, and fourth switching circuits to generate an AC voltage at the load, wherein the control circuit is further configured to cause the third switching circuit to couple the storage capacitor between the first and second busses to maintain the AC voltage at the load while transitioning from supplying power to the load from the AC source to supplying power to the load from the auxiliary power source and to decouple the storage capacitor from at least one of the first and second busses after transitioning to supplying power to the load from the auxiliary power source.
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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.
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Citations
16 Claims
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1. An uninterruptible power supply (UPS) system comprising:
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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; a fourth switching circuit configured to couple an auxiliary power source to the first and second busses; and a control circuit configured to control the first, second, third, and fourth switching circuits to generate an AC voltage at the load, wherein the control circuit is further configured to cause the third switching circuit to couple the storage capacitor between the first and second busses to maintain the AC voltage at the load while transitioning from supplying power to the load from the AC source to supplying power to the load from the auxiliary power source and to decouple the storage capacitor from at least one of the first and second busses after transitioning to supplying power to the load from the auxiliary power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A UPS system comprising:
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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; a first 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; and a second switching circuit configured to couple an auxiliary power source to at least one of the first and second busses, wherein the first switching circuit is configured to couple the second capacitor between the first and second busses to maintain the AC output while transitioning from supplying power to the load from the AC source to supplying power to the load from auxiliary power source and to decouple the second capacitor from at least one of the first and second busses after transitioning to supplying power to the load from the auxiliary power source. - View Dependent Claims (10, 11, 12, 13)
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14. 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:
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detecting a state of the AC source; coupling a storage capacitor between the first and second busses responsive to the detected state of the AC source to maintain an AC output to the load; coupling a battery to at least one of the first and second busses to provide power to the load from the battery; and
thendecoupling the storage capacitor from at least one of the first and second busses. - View Dependent Claims (15, 16)
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Specification