Wireless Charging EMF Emissions

EMF Measurement Of A Rezence Wireless Charger

After CES 2015, I wrote a post, concerned about the increasing prevalence of wireless charging technology, but I didn’t have any measurement tools with me to gauge the actual EMF emissions. CES 2016 I did bring my meters.

I measured chargers based on the two primary tech standards battling for dominance in the consumer device charging market (e.g., phones, tablets, etc.) where the device is intended to make contact with the charger. I have not had the opportunity to measure emissions from any wireless chargers that are designed to charge at a distance.

The two technologies I measured are Qi (pronounced ‘chi’) and Rezence. And it turns out that there are massive differences in emissions from these two technologies.

The wireless chargers I measured based on the Qi standard emitted, at max, 3 milligauss (mG). And when no phone was touching the charger, the emissions were effectively 0 (meaning, when nothing was being charged, the charger emitted nothing, which is a great feature). I measured multiple devices based on the Qi standard, from different manufacturers, and found the same results. And, as expected, the power of those emissions diminished significantly with distance. A few inches away, and you’re already under 1mG.

EMF Measurement Of A Rezence Wireless Charger
The Rezence-based chargers I saw were emitting at least 100 mG

Then I measured emissions from Rezence chargers, and the results were far more concerning. In stark contrast to the Qi chargers, the chargers I measured based on the Rezence standard emitted at least 100 mG. I say ‘at least’ because 100 mG is the max measurement on the Trifield meter I brought with me. Even more troubling, I measured that same reading whether any devices were charging or not. In other words, the wireless chargers I measured based on the Rezence standard, emitted at least 100 mG all the time, whether or not they were actually charging anything.

100 mG is 100x the maximum exposure recommended by the BioInitiative Working Group. So, Rezence chargers emit 2 orders of magnitude above the exposure recommended by this group of international scientists based on their review of thousands of peer-reviewed scientific studies. It really is a massive level of EMF emissions in the ELF (extremely low frequency) range of the spectrum.

I did reach out to both Qi and Rezence. Rezence did not reply. In contrast, Qi replied that their lower emissions are intentional, the product of their superior engineering, a fact that they attempt to explain in greater detail in this post.

While I believe any additional EMF exposures are of potential concern (precisely because they are additive to all the other exposures we already have from our phones, WiFi, smart meters, cell towers and so forth), there is clearly a massive difference between the risks of these two standards. Until Rezence changes their basic engineering design, I would strongly recommend avoiding any wireless chargers based on that standard.

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5 thoughts on “Wireless Charging EMF Emissions

  1. Qi standard includes a protective protocol that verifies existence of proper charged device. If fails ping protocol , then there is no power radiation.
    However, there can be fringing RF during proper charging process.

  2. To be fair, what worries me the most is the radiation that will be created once we get real wireless charging like WiTricity. I mean I don’t see it being possible to charge a smartphone over the air without any radiation. Plus how it will affect us in the long run…

    1. I was in the US Army for 12 years and my job a Comms expert, my time in the military exposed me and my other colleagues to hundreds of hours around RF systems. Be warned it does effect the body. How long you may ask well that’s a matter of expose time your body’s reaction. It will effect you be careful with anything and everything wireless. We are now at the mercey of technology so we now see it as a necessity. But why create more health problems for yourself. I created an ergonomic USB CHARGING port for the hospitality and residential industry that you don’t have to use EMF. Keep your body clear of EMF and RF. Just because you don’t see it doesn’t mean it’s not there and can’t hurt you.

  3. The wireless chargers that was measured in CES2016 should be based on the Qi standard and emitted, at max, 3 milligauss (mG): was a low Power wireless Charger (5W)?
    What about the new extended Power 15W ? are any measurement done?
    The 5W Wireless charger is over the precaution limit (>1mG)
    and the 15W can be more&more.
    BioInitiative Working Group:<>

    1. Hello Karim:

      Thank you for your comment. Unfortunately, I have not yet done any more tests on wireless chargers. Hopefully soon.

      Thank you.

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