Power-meter apparatus, circuits and methods
AssigneeNXP USA, Inc.
InventorsLukas Vaculik, Radek Holis
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Abstract
A power-meter includes a digital signal processor (DSP) configured to determine a respective consumed energy within each of a plurality of predetermined contiguous time intervals, a dequantizer, and a pulse generator. The dequantizer is configured to, for each time interval, determine a sum of a remainder and the consumed energy, calculate an integer pulse-count by dividing the sum of the remainder and the consumed energy by a predetermined pulse-quantum, calculate a new remainder by subtracting the product of the integer pulse-count and the pulse-quantum from the sum, and replace the remainder by the new remainder The pulse generator is configured to, for each time interval, generate the integer pulse-count number of pulses of an indicator signal.
Claims20
A power-meter apparatus comprising:
- a digital signal processor (DSP) configured to determine a respective consumed energy within each of a plurality of predetermined contiguous time intervals;
- a dequantizer configured to, for each time interval:
- determine a sum of a remainder and the consumed energy,
- calculate an integer pulse-count by dividing the sum of the remainder and the consumed energy by a predetermined pulse-quantum,
- calculate a new remainder by subtracting the product of the integer pulse-count and the pulse-quantum from the sum, and
- replace the remainder by the new remainder;
- and
- a pulse generator configured to, for each time interval, generate the integer pulse-count number of pulses of an indicator signal.
A method of metering power consumption, the method comprising:
- determining a respective consumed energy within each of a plurality of predetermined contiguous time intervals;
- and
- for each time interval:
- determining a sum of a remainder and the consumed energy,
- calculating an integer pulse-count by dividing the sum of the remainder and the consumed energy by a predetermined pulse-quantum,
- calculating a new remainder by subtracting the product of the integer pulse-count and the pulse-quantum from the sum,
- replacing the remainder by the new remainder, and
- generating the integer pulse-count number of pulses of an indicator signal.
Dependencies are inferred from the claim text.