DIGITAL CIRCUIT AND METHOD FOR MEASURING AC VOLTAGE VALUES
First Claim
1. An AC measurement circuit comprising;
- a rectifier for receiving an AC signal;
a peak detection circuit;
a voltage divider, interconnected with an output of said rectifier, and the input of said peak detection circuit to provide said peak detection circuit with a voltage value equal to a fraction of said AC signal;
an analog to digital converter, having its analog input interconnected with an output of said peak detection circuit, for providing a digital output corresponding to its analog input;
a summing circuit to sum n samples of said digital output;
wherein said voltage divider is configured so that said summing circuit calculates an average measurement of said AC signal by summing n samples and without floating point division.
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Accused Products
Abstract
An AC measurement circuit includes a rectifier for receiving an AC signal; a peak detection circuit; and a voltage divider, interconnected with an output of the rectifier, and the input of the peak detection circuit to provide the peak detection circuit with a voltage value equal to a fraction of the AC signal. An analog to digital converter, has its analog input interconnected with an output of the peak detection circuit, for providing a digital output corresponding to its analog input. A summing circuit sums n samples of the digital output. The voltage divider is configured so that the summing circuit calculates an average measurement of the AC signal by summing n samples and without floating point division.
5 Citations
18 Claims
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1. An AC measurement circuit comprising;
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a rectifier for receiving an AC signal; a peak detection circuit; a voltage divider, interconnected with an output of said rectifier, and the input of said peak detection circuit to provide said peak detection circuit with a voltage value equal to a fraction of said AC signal; an analog to digital converter, having its analog input interconnected with an output of said peak detection circuit, for providing a digital output corresponding to its analog input; a summing circuit to sum n samples of said digital output; wherein said voltage divider is configured so that said summing circuit calculates an average measurement of said AC signal by summing n samples and without floating point division. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring an AC input voltage, comprising:
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providing said AC signal to a rectifier to provide a rectified output; providing said rectified output to the input of a voltage divider that outputs a fraction of said rectified output; detecting a peak of said output of said voltage divider over time; sampling said peak of said output at an analog to digital converter to produce a digital value; summing n of said digital values; wherein said voltage divider is configured so that an average measurement of said AC signal is calculated by summing said n of said digital values without floating point division. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification