SYSTEM AND METHOD FOR RIPPLE-FREE AC POWER DETERMINATION
First Claim
1. A power metering circuit, comprising:
- a current input path for receiving an analog current input at a first analog to digital converter;
a voltage input path for receiving an analog voltage input at a second analog to digital converter;
a multiplier configured to multiply an output of the current input path and the voltage input path;
a notch filter configured to receive an output of the multiplier, the notch filter having a stop band based on a line frequency; and
a control circuit for setting a sampling frequency of the first analog to digital converter and the second analog to digital converter to a multiple of the line frequency.
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Abstract
A power metering circuit includes a current input path for receiving an analog current input at a first analog to digital converter; a voltage input path for receiving an analog voltage input at a second analog to digital converter; a multiplier configured to multiply an output of the current input path and the voltage input path; a notch filter configured to receive an output of the multiplier, the notch filter having a stop band based on a line frequency; and a control circuit for setting a sampling frequency of the first analog to digital converter and the second analog to digital converter to a multiple of the line frequency.
40 Citations
18 Claims
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1. A power metering circuit, comprising:
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a current input path for receiving an analog current input at a first analog to digital converter; a voltage input path for receiving an analog voltage input at a second analog to digital converter; a multiplier configured to multiply an output of the current input path and the voltage input path; a notch filter configured to receive an output of the multiplier, the notch filter having a stop band based on a line frequency; and a control circuit for setting a sampling frequency of the first analog to digital converter and the second analog to digital converter to a multiple of the line frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power metering circuit, comprising:
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a first input path for receiving one of an analog current input or an analog voltage input at a first analog to digital converter; a second input path for receiving another of the analog voltage input or the analog current input at a second analog to digital converter; a multiplier configured to multiply an output of the first input path and the second input path; and a notch filter configured to receive an output of the multiplier, the notch filter having a stop band based on a line frequency. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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receiving an analog current input at a first analog to digital converter; receiving an analog voltage input at a second analog to digital converter; multiplying an output of the current input path and the voltage input path; notch filtering an output of the multiplier with a stop band based on a line frequency; and setting a sampling frequency of the first analog to digital converter and the second analog to digital converter to a multiple of the line frequency. - View Dependent Claims (15, 16, 17, 18)
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Specification