Intelligent Electronic Device Having Circuitry for Noise Reduction for Analog-to-Digital Converters
First Claim
1. A hybrid-differential analog-to-digital converter, comprising:
- a first single-ended analog-to-digital converter having a first input from a voltage signal;
a second single-ended analog-to-digital converter having a second input from a signal ground wherein said signal ground is a first reference voltage for said voltage signal; and
a programmable device in communication with a first output of said first single-ended analog-to-digital converter and a second output of said second single-ended analog-to-digital converter, said programmable device provides a digital result that is said second output subtracted from said first output, wherein said digital result is free from common-mode noise.
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Abstract
An intelligent electronic device (IED), e.g., an electrical power meter, having circuitry for an input structure of an analog-to-digital converter (ADC) that reduces noise of a signal from a sensor in the device, resulting in a highly accurate power measurement, is provided. The circuitry includes a first single-ended analog-to-digital converter with an input from a voltage signal and a second single-ended analog-to-digital converter with an input that is the reference voltage used by the voltage signal. A programmable device subtracts the digital output of the second single-ended analog-to-digital converter from the digital output of the first single-ended analog-to-digital converter to produce a digital result of the voltage signal that is free from common-mode noise.
57 Citations
20 Claims
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1. A hybrid-differential analog-to-digital converter, comprising:
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a first single-ended analog-to-digital converter having a first input from a voltage signal; a second single-ended analog-to-digital converter having a second input from a signal ground wherein said signal ground is a first reference voltage for said voltage signal; and a programmable device in communication with a first output of said first single-ended analog-to-digital converter and a second output of said second single-ended analog-to-digital converter, said programmable device provides a digital result that is said second output subtracted from said first output, wherein said digital result is free from common-mode noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for reducing noise in an intelligent electronic device, comprising:
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inputting a voltage signal into a first single-ended analog-to-digital converter; inputting a signal ground into a second single-ended analog-to-digital converter wherein said signal ground is a first reference voltage of said voltage signal; and subtracting a second digital output of said second single-ended analog-to-digital converter from a first digital output of said first single-ended analog-to-digital converter wherein said second digital output corresponds to said signal ground and said first digital output corresponds to said voltage signal, said subtracted result is free from common-mode noise. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An intelligent electronic device, comprising:
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a sensor having a sensor output wherein said sensor senses a voltage across a load; a first single-ended analog-to-digital converter having a first input from a voltage signal wherein said voltage signal corresponds to said sensor output; a second single-ended analog-to-digital converter having a second input from a signal ground wherein said signal ground is a first reference voltage for said sensor; a programmable device in communication with a first output of said first single-ended analog-to-digital converter and a second output of said second single-ended analog-to-digital converter, said programmable device provides a digital result that is said second output subtracted from said first output, wherein said digital output is free from common-mode noise; and a processor that receives said digital result and determines a value for said voltage across said load. - View Dependent Claims (17, 18, 19, 20)
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Specification