Thermoelectric Charging

Hi Guys, quick disclaimer my Particle knowledge is minimal. However I am trying to investigate the viability of using a Boron (or other model) Particle Board that can autonomously charge itself via thermoelectric generator. My minimum delta temperature is 125 deg.F. The temperature gradient can become greater, however this is the minimum my process will generate in order to operate. Below this delta-temp I need the board to output a cold/blocked condensate flow alarm and then simply turn off. If the battery has juice to remain on that’s fine but has no use to the sensor application. Once this minimum delta-t threshold is surpassed, I than require a constant output from the Particle Board via wireless sim to my cloud control system. My question is what is the required electric power input to power the Boron and what is the most optimal way to wire the hardware to achieve this. My available power supply wattage can vary as I have substantial surface area to play with. I really appreciate any insight you guys can provide. Also what maximum temperature requirements are the electrical components rated for ? This is an industrial application so I will need to work out the appropriate enclosure.

You can certainly use a Thermomelectric generator chip and accessories to keep the battery charged up.

Ideally your temp chip would have an interrupt pin that you could program to trigger to wake up a sleeping Boron once the temp reading passed your threshold. That way you would only need to power the Temp sensor and let the Boron sleep in low power until needed.

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Hi RWB. Thank you so much for your reply. The super capacitor will work well. The documentation states there are three power output options (below):

  • a LDO voltage regulator with fixed 2.2V output
  • Vout with selectable voltage and
  • Vout2 which follows Vout in terms of voltage

What would be the optimal boron voltage input required ?

Technically my system can run without a temp sensor, as the distance of my steam trap bimetallic element is directly proportional to process temperature. But measuring inlet steam versus outlet condensate temp are vital parameters and probably the easier way to go.

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