Uninterruptible power supply
First Claim
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1. A method of detecting a failure of a DC power system included in an uninterruptible power supply (UPS), the method comprising acts of:
- sampling a voltage provided by the DC power system;
comparing at least two samples to determine whether the voltage provided by the DC power system is decreasing;
adjusting in a first direction, based on a result of the act of comparing, a value that corresponds to an accumulated amount of time during which the voltage provided by the DC power system is less than a threshold voltage and is decreasing;
adjusting the value in a second direction, based on the result of the act of comparing, to account for an amount of time during which the voltage provided by the DC power system is less than the threshold voltage and is increasing; and
generating a signal indicating that the DC power system has failed if the value reaches a predetermined value.
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Abstract
An uninterruptible power supply (UPS) system includes an AC power input configured to receive AC power from a single-phase AC power source or a multi-phase AC power source, a DC power source, an output circuit including a power output, a controllable switch configured to selectively couple at least one of the AC power input and the DC power source to the output circuit, and a processor coupled and configured to affect operation of the output circuit depending upon which of single-phase and multi-phase operation of the UPS is indicated.
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Citations
24 Claims
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1. A method of detecting a failure of a DC power system included in an uninterruptible power supply (UPS), the method comprising acts of:
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sampling a voltage provided by the DC power system; comparing at least two samples to determine whether the voltage provided by the DC power system is decreasing; adjusting in a first direction, based on a result of the act of comparing, a value that corresponds to an accumulated amount of time during which the voltage provided by the DC power system is less than a threshold voltage and is decreasing; adjusting the value in a second direction, based on the result of the act of comparing, to account for an amount of time during which the voltage provided by the DC power system is less than the threshold voltage and is increasing; and generating a signal indicating that the DC power system has failed if the value reaches a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A UPS comprising:
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an AC input configured to receive power from a source of AC power; a DC power system configured to provide DC power; an AC output configured to provide AC power derived from at least one of the source of AC power and the DC power system; and a system configured to detect a failure of the DC power system, the system including; a memory device configured to maintain a value that corresponds to an accumulated amount of time during which a voltage provided by the DC power system is less than a threshold voltage and is decreasing; and a processor coupled to the memory device, wherein the processor is configured to adjust the value in a first direction based on a comparison of at least two samples of a voltage provided by the DC power system if the voltage is less than the threshold voltage and is decreasing, and to adjust the value in a second direction based on the comparison if the voltage provided by the DC power system is less than the threshold voltage and is increasing, wherein the processor is configured to generate a signal indicating that the DC power system is in a failed condition if the value reaches a predetermined value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A UPS comprising:
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an AC input configured to receive power from a source of AC power; a DC power system configured to provide DC power; an AC output configured to provide AC power derived from at least one of the source of AC power and the DC power system; and a system configured to detect a failure of the DC power system, the system including; means configured to maintain a value that corresponds to an accumulated amount of time during which a voltage provided by the DC power system is less than a threshold voltage and is decreasing, to adjust the value in a first direction based on a comparison of at least two samples of a voltage provided by the DC power system if the voltage is less than the threshold voltage and is decreasing, and to adjust the value in a second direction based on the comparison if the voltage provided by the DC power system is less than the threshold voltage and is increasing, wherein the means configured to maintain the value is further configured to generate a signal indicating that the DC power system is in a failed condition if the value reaches a predetermined value. - View Dependent Claims (23, 24)
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Specification