Apparatus for and method of UPS operation
First Claim
1. An uninterruptible power supply adapted to receive power from a polyphase AC source, the uninterruptible power supply comprising:
- power conversion circuitry adapted to convert the power supplied by the polyphase AC source to DC power, the power conversion circuitry including phase conductors;
a neutral coupled to an output of the uninterruptible power supply;
a plurality of input capacitors coupling the phase conductors to the neutral;
a DC system including a positive DC bus having a positive DC bus voltage and a negative DC bus having a negative DC bus voltage; and
a control system adapted to control a difference between a magnitude of the positive DC bus voltage and a magnitude of the negative DC bus voltage by controlling a DC voltage across the input capacitors.
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Abstract
A UPS is adapted to receive power from a polyphase AC source. The UPS includes power conversion circuitry adapted to convert the power supplied by the polyphase AC source to DC power. The power conversion circuitry includes phase conductors. The UPS also includes a neutral coupled to an output of the UPS, a plurality of input capacitors coupling the phase conductors to the neutral, a DC system including a positive DC bus with a positive DC bus voltage and a negative DC bus with a negative DC bus voltage, and a control system. The control system is adapted to control a difference between a magnitude of the positive DC bus voltage and a magnitude of the negative DC bus voltage by controlling a DC voltage across the input capacitors.
75 Citations
42 Claims
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1. An uninterruptible power supply adapted to receive power from a polyphase AC source, the uninterruptible power supply comprising:
power conversion circuitry adapted to convert the power supplied by the polyphase AC source to DC power, the power conversion circuitry including phase conductors;
a neutral coupled to an output of the uninterruptible power supply;
a plurality of input capacitors coupling the phase conductors to the neutral;
a DC system including a positive DC bus having a positive DC bus voltage and a negative DC bus having a negative DC bus voltage; and
a control system adapted to control a difference between a magnitude of the positive DC bus voltage and a magnitude of the negative DC bus voltage by controlling a DC voltage across the input capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of controlling an operation of a polyphase uninterruptible power supply comprising power conversion circuitry, a neutral, and a DC system including the neutral, where the neutral is coupled to the power conversion circuitry and an output of the uninterruptible power supply, the method comprising acts of:
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determining an imbalance of the DC system; and
responding to the imbalance by controlling a DC voltage across input capacitors coupling each of a plurality of phase conductors included in the power conversion circuitry to the neutral. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An uninterruptible power supply adapted to receive power from a polyphase AC source, the uninterruptible power supply comprising:
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power conversion circuitry adapted to convert the power supplied by the polyphase AC source to DC power at both a positive DC bus having a positive DC bus voltage and a negative DC bus having a negative DC bus voltage, the power conversion circuitry including phase conductors;
a neutral coupled to an output of the uninterruptible power supply;
a plurality of input capacitors coupling the phase conductors to the neutral;
means for controlling a difference between a magnitude of the positive DC bus voltage and a magnitude of the negative DC bus voltage by controlling a DC voltage across the plurality of input capacitors. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification