MONITORING POWER-RELATED PARAMETERS IN A POWER DISTRIBUTION UNIT
First Claim
1. A power distribution unit comprising:
- a power distribution unit housing disposable in an electrical equipment rack of the type in which a plurality of electrical components are removably mountable;
a power input penetrating the housing;
a voltage sensor;
a plurality of power outputs disposed in the housing, each in electrical communication with the power input and each connectable to an electrical load;
a plurality of current sensors each in electrical communication with one of the power outputs; and
a power monitoring section in electrical communication with the voltage sensor and the current sensors and responsive to signals provided by the sensors to (1) sample the signals to obtain samples of voltage and current during one cycle of input power, (2) calculate raw RMS values of voltage and current from the samples, and (3) scale the raw RMS values according to a predetermined calibration factor to obtain corrected RMS voltage and current values for the load connected to each power output.
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Accused Products
Abstract
A power distribution unit (PDU) disposable in an electrical equipment rack. The PDU has a housing, a power input penetrating the housing, outlets in the housing, a processor disposed in the housing, voltage and current sensors, and a voltage calculation procedure communicable with the processor. The processor samples voltage and current waveforms and calculates RMS values and other power parameters. A method of managing electrical loads each drawing electrical power from a PDU includes repeatedly sampling voltage across and current flowing through each of the loads, calculating raw RMS values of voltage and current, and scaling the raw RMS values to obtain corrected RMS voltage and current values and other power parameters.
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Citations
45 Claims
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1. A power distribution unit comprising:
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a power distribution unit housing disposable in an electrical equipment rack of the type in which a plurality of electrical components are removably mountable; a power input penetrating the housing; a voltage sensor; a plurality of power outputs disposed in the housing, each in electrical communication with the power input and each connectable to an electrical load; a plurality of current sensors each in electrical communication with one of the power outputs; and a power monitoring section in electrical communication with the voltage sensor and the current sensors and responsive to signals provided by the sensors to (1) sample the signals to obtain samples of voltage and current during one cycle of input power, (2) calculate raw RMS values of voltage and current from the samples, and (3) scale the raw RMS values according to a predetermined calibration factor to obtain corrected RMS voltage and current values for the load connected to each power output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 44)
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20. A power distribution unit comprising:
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a power distribution unit housing disposable in an electrical equipment rack of the type in which a plurality of electrical components are removably mountable; a power input penetrating the housing; a plurality of power outputs disposed in the housing; a processor disposed in the housing; a voltage calculation procedure communicable with the processor; a voltage sensor communicable with the processor; and a plurality of current sensors each communicable with one of the power outputs and with the processor. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 45)
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31. A method of managing a plurality of electrical loads each drawing electrical power from a power distribution unit, the method comprising:
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sampling voltage across and current flowing through each of the loads repeatedly during one cycle of input power; calculating raw RMS values of voltage and current from the samples; and scaling the raw RMS values according to a predetermined calibration factor to obtain corrected RMS voltage and current values for each of the loads. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification