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Energy harvesting to power the CC2640

PATRICK OHARA
Genius 3205 points
Other Parts Discussed in Thread: CC2640

We've been asked to design the front end of a wireless power meter. The meter takes inputs from three current transformers (CTs). The CT converts the current flowing through the "mains" to voltage. The voltage is directly proportional to the current in the "mains" line. We intend to use the CC2640 to digitize the input of 0.0 - .333V RMS from each of the CTs. The CTs have an internal impedance of 46 ohms. So, the current generated by the CTs is 0.0 - 7.0 mA.

Here's the question: Is there a way for us to use the current generated by the CTs to power an energy harvesting system capable of powering the CC2640? The three CTs tethered to a module containing little else than the CC2640 are permanently installed inside the electrical cabinet and not intended to be accessed (including to change batteries).

Thoughts?

Patrick

  • 0
    TI__Guru** 106705 points
    Hi Patrick,

    This is really dependent on the use case. How often do you intend to run the radio? Will it be broadcasting only?

    Keep in mind that the minimum supply voltage for CC2640 is 1.7 V (in 1.8 V configuration), so it seems like you will need some kind of boost circuit or voltage doubler. Combine this with a super-cap or something similar and it should definitely be doable.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Genius 3205 points

    Hi Fredrik,

    Thanks for the suggestions. I'll keep this in mind as we continue to investigate this design.

    Patrick