UPS systems and methods using coordinated static switch and inverter operation for generator walk-in
First Claim
1. An uninterruptible power supply (UPS) comprising:
- an AC output;
an inverter coupled to the AC output and configured to provide power at the AC output;
a switch configured to selectively couple a generator to the AC output; and
a control circuit configured to alternately turn on the switch and activate the inverter in respective separate intervels to gradually increase power flow from the generator to the AC output.
2 Assignments
0 Petitions
Accused Products
Abstract
An uninterruptible power supply (UPS) system includes an AC output, an inverter coupled to the AC output and configured to provide power at the AC output, and a switch configured to selectively couple a generator (e.g., an engine-generator set) to the AC output. The system further includes a control circuit configured to variably modulate the switch to gradually increase control power flow from the generator to the AC output while causing the inverter to concurrently provide power to the AC output. The switch may be a static switch that includes at least one silicon controlled rectifier (SCR), and the control circuit may be configured to control a conduction interval of the at least one SCR to control power flow from the generator to the AC output.
13 Citations
19 Claims
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1. An uninterruptible power supply (UPS) comprising:
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an AC output; an inverter coupled to the AC output and configured to provide power at the AC output; a switch configured to selectively couple a generator to the AC output; and a control circuit configured to alternately turn on the switch and activate the inverter in respective separate intervels to gradually increase power flow from the generator to the AC output. - View Dependent Claims (2, 3, 4, 5, 6, 17)
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7. A system comprising:
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a utility power source; an engine-generator set; a static switch configured to couple the engine-generator set to a load; an inverter having an output configured to be coupled to the load; and a control circuit operatively coupled to the engine-generator set, the static switch, and the inverter and configured to detect a failure of the utility power source, to activate the engine-generator set and to alternately turn on the switch and activate the inverter in respective separate intervals to gradually increase power flow from the engine-generator set to the load. - View Dependent Claims (8, 9, 10, 11, 18)
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12. A method comprising:
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providing AC power to a load from an AC power source; detecting a loss of the AC power source; transitioning the load to an inverter of a UPS responsive to the detected loss of the AC power source; activating a generator responsive to detected loss of the AC power source; and alternately coupling the generator to the load via a switch and activating the inverter in respective separate intervals. - View Dependent Claims (13, 14, 15, 16, 19)
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Specification