Uninterruptible power supply
First Claim
1. An uninterruptible power supply (UPS), comprising:
- (a) a dc bus;
(b) a first uncontrolled rectifier in combination with a first filter for coupling a main ac power supply to the dc bus with a first power factor;
(c) a second uncontrolled rectifier in combination with a second filter for coupling an auxiliary generator to the dc bus with a second power factor; and
(d) a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to a load;
wherein the first and second power factors are greater than or equal to approximately 0.95.
3 Assignments
0 Petitions
Accused Products
Abstract
An electronic circuit, such as a UPS, interfaces a main ac power source and at least one secondary power source to a load. The secondary power source(s) may include one or more auxiliary generators, a flywheel motor generator or microturbine with high speed motor generator, and/or any of a variety of dc storage devices. The electronic circuit includes a dc bus, a first uncontrolled rectifier in combination with a first filter for coupling the main ac power supply to the dc bus, one or more additional uncontrolled rectifier(s) and filter(s) for coupling the auxiliary generator(s) to the dc bus, and a dc-to-ac inverter (between the dc bus and the load) for providing ac output power to the load. The advantages of reduced parts count, increased compatibility between the generator(s) and the electronic circuit, and a simpler method for paralleling many storage and generation devices with a very high power factor to the sources, regardless of the load power factor, are provided.
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Citations
19 Claims
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1. An uninterruptible power supply (UPS), comprising:
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(a) a dc bus;
(b) a first uncontrolled rectifier in combination with a first filter for coupling a main ac power supply to the dc bus with a first power factor;
(c) a second uncontrolled rectifier in combination with a second filter for coupling an auxiliary generator to the dc bus with a second power factor; and
(d) a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to a load;
wherein the first and second power factors are greater than or equal to approximately 0.95.
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2. An uninterruptible power supply (UPS), comprising:
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(a) a dc bus;
(b) a first uncontrolled rectifier in combination with a first filter for coupling a main ac power supply to the dc bus with a first power factor;
(c) a second uncontrolled rectifier in combination with a second filter for coupling an auxiliary generator to the dc bus with a second power factor;
(d) a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to a load; and
a dc bus capacitor circuit operatively coupled to the dc bus and the dc-to-ac inverter. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An uninterruptible power supply (UPS), comprising:
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(a) a dc bus;
(b) a first uncontrolled rectifier in combination with a first filter for coupling a main ac power supply to the dc bus with a first power factor;
(c) a second uncontrolled rectifier in combination with a second filter for coupling an auxiliary generator to the dc bus with a second power factor;
(d) a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to a load; and
a dc bus capacitor circuit operatively coupled to the dc bus and the dc-to-ac inverter, wherein the dc bus capacitor circuit comprises means for controlling the charging and discharging of the capacitor C1 in such a way as to produce high nominal power factors as seen by the ac sources connected to the dc bus through the uncontrolled rectifiers, and wherein the nominal high power factors are greater than or equal to approximately 0.95.
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13. A power system, comprising a main ac supply, an auxiliary generator, a load, and an electronic circuit operatively coupled to the main ac supply auxiliary generator and load;
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
further comprising a flywheel motor generator and a second inverter interfacing the flywheel motor generator to the electronic circuit, whereby dc bus voltage may be used to start the motor generator for the purpose of storing energy with the flywheel.
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
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14. A power system, comprising a main ac supply;
- an auxiliary generator;
a load;
an electronic circuit operatively coupled to the main ac supply auxiliary generator and load;
wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
further comprising a microturbine with a high speed motor generator and a second inverter interfacing the motor generator to the electronic circuit, whereby dc bus energy may be used to turn the motor generator for the purpose of starting the microturbine.
- an auxiliary generator;
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15. A power system, comprising a main ac supply, an auxiliary generator, a load, and an electronic circuit operatively coupled to the main ac supply auxiliary generator and load;
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
further comprising a dc storage device and a dc-to-dc converter interfacing the dc storage device to the dc bus of the electronic circuit. - View Dependent Claims (16)
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
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17. A power system, comprising a main ac supply, an auxiliary generator, a load, and an electronic circuit operatively coupled to the main ac supply auxiliary generator and load;
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
further comprising means for producing a high nominal power factor as seen by the main ac supply and auxiliary generator, wherein the high nominal power factor is at least approximately 0.95.
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
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18. A power system, comprising a main ac supply, an auxiliary generator, a load, and an electronic circuit operatively coupled to the main ac supply auxiliary generator and load;
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
further comprising means to provide clamping of surges on the dc bus.
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
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19. A power system, comprising a main ac supply, an auxiliary generator, a load, and an electronic circuit operatively coupled to the main ac supply auxiliary generator and load;
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
further comprising means to prevent voltage sagging on the dc bus.
- wherein the electronic circuit comprises a dc bus, a first uncontrolled rectifier for coupling the main ac supply to the dc bus, a second uncontrolled rectifier for coupling the auxiliary generator to the dc bus, a dc-to-ac inverter operatively coupled to the dc bus for providing ac output power to the load; and
Specification