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Ask an Expert Forum Ultra-Thin Energy Harvesting Circuit for RFID Timestamp Logging
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Ultra-Thin Energy Harvesting Circuit for RFID Timestamp Logging

alejo05
alejo05 10 months ago
Hi!

I'm are looking for a battery-free hardware solution that can generate enough energy upon handling to log a timestamp into an RFID chip’s internal memory. The key requirements are:

No battery – The device should harvest energy when the envelope is moved or handled (piezoelectric, RF, or other energy harvesting methods).

Ultra-thin form factor – Must fit inside an envelope with a maximum thickness of 1 cm.

Energy-efficient – Must generate just enough power to store a timestamp in an RFID chip.

Scalability – We plan to produce 16,000 units, so the solution should be cost-effective for mass production.

Do you know about any existing components that meet these requirements? If not, would you be able to suggest a different approach?
 
I was thinking about the PPA line but it might be too expensive for what I'm looking for. 
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  • dougw
    dougw 10 months ago +2
    What kind of handling is supposed to trigger this time stamp? It is unlikely you will have a reliable source of scavengable energy at the time of trigger, unless the handler is trying to intentionally…
  • shabaz
    shabaz 10 months ago +2
    "Must generate just enough power to store a timestamp in an RFID chip" "The device should harvest energy when the envelope is moved or handled " But where does the power come from to continuously run…
  • anniel747
    anniel747 10 months ago +1
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  • anniel747
    0 anniel747 10 months ago
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  • alejo05
    0 alejo05 10 months ago in reply to anniel747

    Good to hear! I have found most components are a couple of MM so it is good that is not a hard requirement to fulfill 

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  • anniel747
    0 anniel747 10 months ago in reply to alejo05
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  • alejo05
    0 alejo05 10 months ago in reply to anniel747

    Thank you for your answer. To clarify, I am specifically looking for an energy harvesting component that can generate power when an envelope is handled or moved. This energy will be used to activate a small circuit that writes a timestamp into an RFID chip’s memory.

    The circuit and the RFID are already "decide"

    My main focus is on identifying an ultra-thin energy harvesting component that can power the circuit. Do you have any components that could work for this?

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  • anniel747
    0 anniel747 10 months ago in reply to alejo05
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  • alejo05
    0 alejo05 10 months ago in reply to anniel747

    Thanks again for your reply anniel747  I see that it works with a photovoltaic cell, since this will be inside an envelope, I don't think it will work, or am I missing something? 


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  • dougw
    0 dougw 10 months ago

    What kind of handling is supposed to trigger this time stamp? It is unlikely you will have a reliable source of scavengable energy at the time of trigger, unless the handler is trying to intentionally trigger a time stamp. If that is the case, there are all kinds of options. 

    Otherwise you might explore paper thin batteries (0.4mm) on a 0.6mm circuit board with a piezo film trigger. The battery might be cheaper and way more reliable (even lasting years) than a fancy but unreliable energy scavenging system.

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  • alejo05
    0 alejo05 10 months ago in reply to dougw

    Hi Doug!

    I appreciate your insights. We are exploring battery-free energy harvesting solutions to power a small circuit for timestamp logging when an envelope is dropped into a mailbox.

    We are open to piezoelectric, RF, or other harvesting methods, but the solution must work without light (since it's inside an envelope) and without lithium batteries (strict client restriction). We’ve explored non-lithium thin batteries, but manufacturers have discontinued most viable options.

    Would you have any recommendations for energy harvesting solutions that could generate ~0.5mJ reliably under these constraints?

    Looking forward to your thoughts.

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  • shabaz
    0 shabaz 10 months ago

    "Must generate just enough power to store a timestamp in an RFID chip"

    "The device should harvest energy when the envelope is moved or handled "

    But where does the power come from to continuously run the real-time clock circuit? You're going to need some sort of energy storage, either a battery or perhaps a supercap.I don't think you can hope to continuously power something in an envelope if you only plan to harvest energy when it is moved. What if it's not moved for days?

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  • shabaz
    0 shabaz 10 months ago

    "maximum thickness of 1 cm."

    "We’ve explored non-lithium thin batteries, but manufacturers have discontinued most viable options"

    Varta make non-Lithium coin cells under 10 mm thickness:

    https://www.conrad.com/en/p/varta-v-80-h-button-cell-rechargeable-80h-nimh-80-mah-1-2-v-1-pc-s-254215.html

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