Digital dynamic filtering and beat frequency reduction for power monitoring
AssigneeSquare D Company
InventorAvery Long
Life of this patent
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Abstract
A power metering apparatus meters a power signal in a powered system. A low-pass filter receives the power signal and outputs a filtered signal. The filter implements a corner frequency programmable based on a first clocking signal and anti-aliases high frequency components of the power signal. An A/D converter receives the filtered signal and outputs a digital signal. The A/D converter samples the filtered signal according to a system clock based on a second clocking signal. A clocking element generates and outputs each of the first clocking signal and the second clocking signal. The first clocking signal is synchronous with the second clocking signal.
Claims20
A power metering apparatus to meter a power signal in a powered system, comprising:
- a low-pass filter to receive the power signal being metered by the power metering apparatus and output a filtered signal, wherein the low-pass filter implements a corner frequency programmable based on a first clocking signal and anti-aliases high frequency components of the power signal;
- an A/D converter to receive the filtered signal and output a digital signal, the A/D converter sampling the filtered signal according to a system clock based on a second clocking signal;
- and
- a clocking element to generate and output each of the first clocking signal and the second clocking signal, wherein the first clocking signal is synchronous with the second clocking signal.
A method of metering a power signal in a powered system, comprising:
- generating each of a first clocking signal and a second clocking signal wherein the first clocking signal is synchronous with the second clocking signal;
- receiving the power signal being metered in the powered system, filtering the power signal to generate a filtered signal, wherein a programmable corner frequency is implemented based on the first clocking signal and the filtering anti-aliases high frequency components of the power signal;
- and
- digitizing the filtered signal via an analog-to-digital converter to generate a digital signal, a system clock of the analog-to-digital converter being based on the second clocking signal.
Dependencies are inferred from the claim text.