Method and apparatus of obtaining power computation parameters
First Claim
1. A method for obtaining power computation parameters comprising:
- generating a single analog signal from a plurality of multi-phase analog signals, wherein said single analog signal takes on a value of one of said plurality of multi-phase analog signals at each cycle of a first clock signal;
converting said single analog signal to a digital representation using a second clock signal;
generating a plurality of digital signals from said digital representation, wherein each one of said plurality of digital signals represents a digital form of one of said plurality of multi-phase analog signals; and
obtaining power computation parameters by compensating said plurality of digital signals for differences in sample interval thereby providing digital values of all signals in each phase of said plurality of multi-phase analog signals at the same sample time.
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Abstract
A method and apparatus for obtaining power computation parameters is presented. Accurate computation of power requires multiplying voltage and current at the same instant of time and integrating the results over time. The present invention provides a method of using a single Analog to Digital Converter to convert both voltage and current for all the phases of any electrical system and then digitally compensating for the phase error caused by the non-simultaneous sampling of the current and voltage signals. The compensating filter could be implemented as a simple interpolator, an all-pass filter, or a combination of both. A single multiplexer is used to select which signal is processed by the Analog to Digital Converter. By scheduling and converting the voltage and analog signals one at a time, potential for crosstalk is significantly reduced, power requirement is reduced, and die size requirement is reduced.
22 Citations
27 Claims
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1. A method for obtaining power computation parameters comprising:
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generating a single analog signal from a plurality of multi-phase analog signals, wherein said single analog signal takes on a value of one of said plurality of multi-phase analog signals at each cycle of a first clock signal;
converting said single analog signal to a digital representation using a second clock signal;
generating a plurality of digital signals from said digital representation, wherein each one of said plurality of digital signals represents a digital form of one of said plurality of multi-phase analog signals; and
obtaining power computation parameters by compensating said plurality of digital signals for differences in sample interval thereby providing digital values of all signals in each phase of said plurality of multi-phase analog signals at the same sample time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for computing power comprising:
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selecting a first analog signal from two analog signals comprising a current signal and a voltage signal;
converting said first analog signal to a first digital representation using an analog to digital converter at a first sample interval;
making said first digital representation available as a first digital signal;
selecting a second analog signal of said two analog signals;
converting said second analog signal to a second digital representation using said analog to digital converter at a second sample interval;
computing a second digital signal representing said second analog signal at said first sample interval using said second digital representation; and
computing electrical power consumption using said first digital signal and said second digital signal. - View Dependent Claims (9, 10, 11)
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12. An apparatus for obtaining power computation parameters comprising:
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a multiplexer for generating a single analog signal from a plurality of multi-phase analog signals, wherein said single analog signal takes on a value of one of said plurality of multi-phase analog signals at each cycle of a first clock signal;
an analog to digital converter converting said single analog signal to a digital representation using a second clock signal;
a demultiplexing device generating a plurality of digital signals from said digital representation, wherein each one of said plurality of digital signals represents a digital form of one of said plurality of multi-phase analog signals; and
a phase correction circuit compensating said plurality of digital signals for sample skew associated with said converting in said analog to digital converter to obtain digital samples values at the same sample interval, wherein said phase correction circuit is not a phase delay. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for computing power comprising:
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a multiplexer selecting a first analog signal from two analog signals at a first sample interval, said multiplexer selecting a second analog signal of said two analog signals at a second sample interval;
an analog to digital converter converting said first analog signal to a first digital representation at said first sample interval, said analog to digital converter converting said second analog signal to a second digital representation at said second sample interval;
a demultiplexing device parsing said first digital representation as a first digital signal said second digital representation as a second digital signal; and
a power computation circuitry having a phase correction circuit for generating a third digital signal representing a digital equivalent value of said second analog signal at said first sample interval using said second digital signal, said power computation circuitry computing electrical power consumption using said first digital signal and said third digital signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification