Nxp Usa, Inc.

Radomir Kozub

Martin Mienkina

Lukas Vaculik

Ludek Slosarcik

An electric power meter for measuring electric power is provided. The power meter has a frequency domain converter arranged to convert a sequence of digital voltage samples from the time domain to a frequency domain obtaining digital voltage frequency components, and to convert a sequence of digital current samples from the time domain to the frequency domain obtaining digital current frequency components. The electric power meter also has a frequency domain correction unit arranged to correct the voltage frequency components and the current frequency components by multiplying at least one frequency component of the current frequency components and the voltage frequency components with a complex correction factor using a complex multiplication unit. Electric power is computed by an energy calculation unit.

Electric power meter

There is provided an energy consumption meter device comprising including a processor arranged to receive input data from the sampling unit. The processor calculates at a calculation step [n] an energy contribution value using &#x394;E using a sampled voltage value and a sampled current value. The processor will calculate an energy value E[n] using a reminder value which was calculated at a previous calculation step [n&#x2212;1]. The processor will then calculate a relative delay Td' using the threshold value, the reminder value and the energy value, and generate an output pulse at an output time tpulse which is delayed for the relative delay Td&#x2032; with respect to the calculation time step[n]. By delaying the output pulse with a value which is a closest proximity of Td, the cycle-by-cycle jitter is less or equal to the clock frequency of the timer tclk.

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Ostrava-Poruba, Czechia

Radomir Kozub