AC power supply apparatus, methods and computer program products using PWM synchronization
First Claim
1. A method of operating a plurality of paralleled uninterruptible power supplies (UPSs), the UPSs including respective pulse-width modulation (PWM) power converter circuits coupled in common to an AC load bus, the method comprising:
- synchronizing PWM cycles of the PWM power converter circuits.
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Accused Products
Abstract
Paralleled uninterruptible power supplies (UPSs) including respective pulse-width modulation (PWM) power converter circuits coupled in common to an AC load bus have PWM cycles that are synchronized. In particular, sampling of control inputs of the PWM power converter circuits may be synchronized, such that, for example, sampling of control inputs to the PWM power converter circuits occurs at substantially the same time for each of the PWM power converter circuits. A common phase reference corresponding to an AC voltage phase for the AC load bus may be provided, and the PWM cycles of each of the power converter circuits may synchronized, e.g., phase locked, to the common phase reference. More particularly, the respective PWM cycles of the UPSs may be phase locked to phase locked sinusoidal reference signals generated at each of the UPSs. Sampling for other control functions may also be synchronized to the PWM cycles.
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Citations
51 Claims
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1. A method of operating a plurality of paralleled uninterruptible power supplies (UPSs), the UPSs including respective pulse-width modulation (PWM) power converter circuits coupled in common to an AC load bus, the method comprising:
synchronizing PWM cycles of the PWM power converter circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system, comprising:
a plurality of paralleled UPSs, the UPSs including respective PWM power converter circuits coupled in common to an AC load bus and operating according to synchronized PWM cycles. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An uninterruptible power supply (UPS), comprising:
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a first PWM power converter circuit configured to be coupled to an AC load bus; and
a PWM cycle synchronizer circuit operative to synchronize PWM cycles of the PWM power converter circuit to PWM cycles of a second PWM power converter circuit coupled to the AC load bus. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A computer program product for controlling a UPS having a first PWM power converter circuit configured to be coupled to an AC load bus, the computer program product comprising a computer readable storage medium having computer readable program code embodied therein, the computer readable program code comprising:
program code configured to synchronize PWM cycles of the PWM power converter circuit to PWM cycles of a second PWM power converter circuit coupled to the AC load bus. - View Dependent Claims (48, 49, 50, 51)
Specification