Systems and methods for uninterruptible power supply control
First Claim
1. A method of distributing power to a load using an uninterruptible power supply having an output inverter and a filter, the filter having an inductor and a capacitor, comprising:
- applying a pulse width modulation control signal to the output inverter;
sampling inductor current at a first sampling time at a beginning of one switching cycle and a second sampling time at an end of the one switching cycle, the one switching cycle having a time period extending from the beginning of the one switching cycle to the end of the one switching cycle;
comparing the inductor current at the first sampling time with a reference current at the first sampling time;
adjusting a duty cycle of the pulse width modulation control signal during the time period to drive the inductor current at the second sampling time towards a value of the reference current at the first sampling time; and
applying an output voltage of the uninterruptible power supply to the load.
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Accused Products
Abstract
Systems and methods are provided for distributing power to a load by controlling an uninterruptible power supply that has an inverter and a filter, where the filter has an inductor and a capacitor. The systems and methods apply a pulse width modulation control signal to the inverter, sample inverter inductor current and compare the inductor current to a reference current. A duty cycle of the pulse width modulation control signal is adjusted to drive the inductor current at a second sampling time to a value substantially equal to a reference current at a first sampling time. The systems and methods can filter harmonic distortion from output signals and control uninterruptible power supply output.
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Citations
56 Claims
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1. A method of distributing power to a load using an uninterruptible power supply having an output inverter and a filter, the filter having an inductor and a capacitor, comprising:
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applying a pulse width modulation control signal to the output inverter; sampling inductor current at a first sampling time at a beginning of one switching cycle and a second sampling time at an end of the one switching cycle, the one switching cycle having a time period extending from the beginning of the one switching cycle to the end of the one switching cycle; comparing the inductor current at the first sampling time with a reference current at the first sampling time; adjusting a duty cycle of the pulse width modulation control signal during the time period to drive the inductor current at the second sampling time towards a value of the reference current at the first sampling time; and applying an output voltage of the uninterruptible power supply to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 52)
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26. An uninterruptible power supply having an output inverter and a filter, the filter having an inductor and a capacitor, comprising:
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a processor configured to apply a pulse width modulation control signal to the output inverter; the processor configured to sample inductor current at a first sampling time at a beginning of one switching cycle and a second sampling time at an end of the one switching cycle, the one switching cycle having a time period extending from the beginning of the one switching cycle to the end of the one switching cycle; the processor configured to compare the inductor current at the first sampling time with a reference current at the first sampling time; and the processor configured to adjust a duty cycle of the pulse width modulation control signal during the time period to drive the inductor current at the second sampling time towards a value of substantially equal to the reference current at the first sampling time; and the uninterruptible power supply configured to apply an output voltage for a load. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 53)
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45. An uninterruptible power supply, comprising:
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an input module configured to receive a pulse width modulation control signal; a control module including an output inverter and a filter, the filter having an inductor; an output module coupled to the input module and to the control module to provide output power to a load in response to the pulse width modulation control signal; and means for adjusting a duty cycle of the pulse width modulation control signal to drive current through the inductor towards a reference current value within a time period less than or equal to a switching cycle time period of a carrier signal associated with the pulse width modulation control signal. - View Dependent Claims (54)
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46. A computer readable medium having stored thereon sequences of instruction including instructions that will cause a processor to:
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apply a pulse width modulation control signal to an output inverter of a power supply, the power supply including a filter having an inductor and a capacitor; sample inductor current at a first sampling time at a beginning of one switching cycle and a second sampling time at an end of the one switching cycle, the one switching cycle having a time period extending from the beginning of the one switching cycle to the end of the one switching cycle; compare the inductor current at the first sampling time with a reference current at the first sampling time; adjust a duty cycle of the pulse width modulation control signal during the time period to drive the inductor current at the second sampling time towards a value of the reference current at the first sampling time; and apply an output voltage of the uninterruptable power supply to the load. - View Dependent Claims (47, 48, 55)
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49. A system for distributing power to a load, the system having an output inverter and a filter, the filter having an inductor and a capacitor, the system comprising:
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a processor configured to apply a pulse width modulation control signal to the output inverter; the processor configured to sample inductor current at a first sampling time at a beginning of one switching cycle and a second sampling time at an end of the one switching cycle, the one switching cycle having a time period extending from the beginning of the one switching cycle to the end of the one switching cycle; the processor configured to compare the inductor current at the first sampling time with a reference current at the first sampling time; the processor configured to adjust a duty cycle of the pulse width modulation control signal during the time period to drive the inductor current at the second sampling time towards a value of the reference current at the first sampling time; and the processor configured to apply an output voltage for the load. - View Dependent Claims (50, 51, 56)
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Specification