Uninterruptible power supply
First Claim
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1. A short-circuit response device for use in an uninterruptible power supply (UPS) system, the device comprising:
- an inverter coupled to an output of power circuitry of the UPS, the inverter including an output configured to be coupled to a load to provide power to the load; and
a processor coupled to the inverter and configured to turn off the inverter if the inverter is determined to be coupled to a short circuit for longer than a threshold amount of time, wherein a determination of whether the inverter is coupled to the short circuit is based on a waveshape of an output voltage of the inverter,wherein the processor is configured to provide a signal to inhibit the UPS from being connected in a bypass configuration coupling an input power source of the UPS directly to the load if the load has been determined to include a short circuit.
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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.
46 Citations
19 Claims
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1. A short-circuit response device for use in an uninterruptible power supply (UPS) system, the device comprising:
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an inverter coupled to an output of power circuitry of the UPS, the inverter including an output configured to be coupled to a load to provide power to the load; and a processor coupled to the inverter and configured to turn off the inverter if the inverter is determined to be coupled to a short circuit for longer than a threshold amount of time, wherein a determination of whether the inverter is coupled to the short circuit is based on a waveshape of an output voltage of the inverter, wherein the processor is configured to provide a signal to inhibit the UPS from being connected in a bypass configuration coupling an input power source of the UPS directly to the load if the load has been determined to include a short circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of short circuit protection for an uninterruptible power supply (UPS) that includes an inverter having an output which is coupled to a load, the method comprising acts of:
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monitoring a waveshape of an output voltage of the inverter to determine whether the load includes a short circuit; turning the inverter off if the waveshape of the output voltage indicates that the short circuit exists; providing a predetermined threshold amount of time that the waveshape indicates the short circuit exists before turning the inverter off; and establishing the predetermined threshold amount of time to turn the inverter off before the short circuit propagates to an AC power source coupled to an input of the UPS. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A short-circuit response device for use in an uninterruptible power supply (UPS) system, the device comprising:
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an inverter coupled to an output of power circuitry of the UPS, the inverter including an output configured to be coupled to a load to provide power to the load; means for monitoring a waveshape of an output voltage of an inverter to determine whether the inverter is coupled to a short circuit for longer than a threshold amount of time; means for turning off the inverter responsive to a determination that the inverter is coupled to the short circuit for longer than the threshold amount of timer; and a processor, wherein the processor includes the means for monitoring the waveshape and the means for turning off the inverter, and wherein the means for monitoring the waveshape of the output voltage comprises means for providing a waveshape indication of whether the waveshape is valid to the means for turning off the inverter. - View Dependent Claims (14, 15)
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16. A short-circuit response device for use in an uninterruptible power supply (UPS) system, the device comprising:
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an inverter coupled to an output of power circuitry of the UPS, the inverter including an output configured to be coupled to a load to provide power to the load; a processor coupled to the inverter and configured to turn off the inverter if the inverter is determined to be coupled to a short circuit for longer than a threshold amount of time, wherein a determination of whether the inverter is coupled to the short circuit is based on a waveshape of an output voltage of the inverter; and a waveshape detector included in the processor, wherein the waveshape detector is configured to provide a waveshape indication indicative of whether the waveshape of the output voltage is valid. - View Dependent Claims (17)
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18. A method of short circuit protection for an uninterruptible power supply (UPS) that includes an inverter having an output which is coupled to a load and a waveshape detector coupled to the output of the inverter, the method comprising acts of:
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monitoring a waveshape of an output voltage of the inverter to determine whether the load includes a short circuit; turning the inverter off if the waveshape of the output voltage indicates that the short circuit exists; providing a predetermined threshold amount of time that the waveshape indicates the short circuit exists before turning the inverter off; monitoring the waveshape with the waveshape detector; generating, based on the waveshape and with the waveshape detector, an output signal indicative of whether the short circuit exists; and establishing the predetermined threshold amount of time to avoid a false determination that the short circuit exists which would otherwise result from load transients expected during a normal operation of the load. - View Dependent Claims (19)
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Specification