ADE7878A and Raspberry PI capeabilities

Hi, I am a final year student studying electrical and electronic engineering. I
am busy building a 3 phase power logger but it must be able to measure DC as
well. A typical application would be measuring on both sides of an inverter on
a PV plant. My question is if the ADE78878A is able to measure DC. I would also
like to know if the waveform sampling on the ADE7878A gives the instantaneous
voltage and current of each phase and can it be used to recreate the actual
voltage and current wave-forms as well as calculate things like total harmonic
distortion. I am planning on using a Raspberry PI 3 model B as the controller.
It has 2 I2C channels and only one SPI channel but the documentation states
that the PI can interface with 2 SPI devices simultaneously. Is it possible to
connect 2 ADE7878A chips to the PI and use the i2C for communication and the
SPI port for HSDC (Waveform Sampling) Thank you in advance.

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  • Hi Dlath,

    Thank you very much for the reply. I am doing my final year project and my topic is building a three phase power logger with a Raspberry PI and it was later added on that it should be able to read DC as well as I described above. I probably wouldn't need a complete energy measuring IC like the AD7878A because I can do all of the power calculations on the PI. Would it be possible  to rather use a ADC like the AD7265 with 12 inputs because I convert the 3 phase currents and neutral current as well as 2 DC currents (one for each MPPT on an inverter) to voltages (with CT's and Hall effect sensors) and I then step down the 3 phase voltages and the 2 DC voltages to a range within the ADC, to then sample that at a fast enough rate. The AD7265 has simultaneous sampling so I can maybe sample each phase voltage and current simultaneously and then send all that raw data to the PI via SPI to the process the data to get current and voltage waveforms, power quality parameters like THD ect and to calculate the power (active reactive and apparent) and log it.

    Any advice would by highly appreciated.

    Thank you

    Eduan 

Reply
  • Hi Dlath,

    Thank you very much for the reply. I am doing my final year project and my topic is building a three phase power logger with a Raspberry PI and it was later added on that it should be able to read DC as well as I described above. I probably wouldn't need a complete energy measuring IC like the AD7878A because I can do all of the power calculations on the PI. Would it be possible  to rather use a ADC like the AD7265 with 12 inputs because I convert the 3 phase currents and neutral current as well as 2 DC currents (one for each MPPT on an inverter) to voltages (with CT's and Hall effect sensors) and I then step down the 3 phase voltages and the 2 DC voltages to a range within the ADC, to then sample that at a fast enough rate. The AD7265 has simultaneous sampling so I can maybe sample each phase voltage and current simultaneously and then send all that raw data to the PI via SPI to the process the data to get current and voltage waveforms, power quality parameters like THD ect and to calculate the power (active reactive and apparent) and log it.

    Any advice would by highly appreciated.

    Thank you

    Eduan 

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