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EMI-Reduction-Techniques
Engagement
  • Author Author: ctammann
  • Date Created: 16 Apr 2021 7:41 PM Date Created
  • Views 1151 views
  • Likes 9 likes
  • Comments 5 comments
  • ultra96-v2
  • microzed
  • xilinx
  • wireless power
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Wireless power experiments

ctammann
ctammann
16 Apr 2021

I'm a huge fan of wireless power. I'm looking forward to the advancement of longer range wireless power as well. For now I've been trying to figure out ways to introduce it to our Avnet products. The typical application is obviously wireless charging, whether it be cell phones, accessories, whatever. I've been thinking a lot about environmentally sealed applications. Like a pole or a wall plate that has transmit coils built in along with magnets or threaded holes. Then you could have an environmentally sealed "node", whether that be a camera, proximity or motion sensor, security light, whatever. A while back I experimented with trying to power our MicroZed product wirelessly. One of the pictures on my profile page is of this setup, here it is again:

image

Here I took our MicroZed and an IDT (now Renesas) wireless power demo kit, ran it through a multimeter and was able to deliver 5W to our board. Unfortunately at the time I wasn't really able to take it further than that. I still have that kit, as well as a 15W transmitter kit with a 12V receive coil. I quickly mocked up another experiment using the 12V receive coil to see if I could power up an Ultra96-V2. I was able to power it and boot it, but when I tried to run the AI demo with my Dual Camera Mezzanine accessory it went into overcurrent reset. I'm going to wire it up with the meter so I can see how much power I can get out of it. I'm not sure how much current it was actually delivering. I may also try using the 5V coil and bypassing the 12V to 5V regulator on Ultra96-V2.

 

I'm also going to look into some newer demo kits. The ones I have are several years old and newer devices will obviously be more efficient and provide higher output levels.

 

Anybody have some cool wireless power applications they have worked on? I'd love to hear about them in the comments.

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Top Comments

  • dougw
    dougw over 4 years ago +5
    I worked on wireless power to an artificial heart once, but on element14 there are different projects: The KLINGMAGON Subspace Probe LED Road Test - 3D Printed Housings - blog 2 Nov 10
  • shabaz
    shabaz over 4 years ago +3
    Hi Chris, Another useful although indirect application is with NFC, where an unpowered device can have part of its circuitry powered up sufficiently enough for transferring data (could be credentials,…
  • ctammann
    ctammann over 4 years ago +2
    Thanks for the comments! You remind me I did leave out that market segment for only applying temporary power to a sensor node. I worked at a company briefly that used an energized coil to wirelessly power…
  • ctammann
    ctammann over 4 years ago in reply to bhfletcher

    This is the kit from Renesas that I was experimenting with - https://www.renesas.com/us/en/products/power-management/wireless-power/wireless-power-transmitters/p9242-r-wpc-122-compl…

     

    I need to tweak some things and see how much current I can get out of that 12V receive coil. I don't know what kind of efficiency I was actually seeing.

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  • bhfletcher
    bhfletcher over 4 years ago

    Hey, ctammann which specific renesas kit was this? Do they have a newer one that offers more power?

     

    One big reason that I switched over to my latest phone with wireless charging was to avoid wearing out the connector, which is what I did on my last phone.

     

    Bryan

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  • ctammann
    ctammann over 4 years ago

    Thanks for the comments! You remind me I did leave out that market segment for only applying temporary power to a sensor node. I worked at a company briefly that used an energized coil to wirelessly power an implantable device to read back data. It was very cool technology. Periodic power rather than constant power is another great application for wireless.

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  • shabaz
    shabaz over 4 years ago

    Hi Chris,

     

    Another useful although indirect application is with NFC, where an unpowered device can have part of its circuitry powered up sufficiently enough for transferring data (could be credentials, or say log data). I'm thinking of devices that are in their shipping cartons, or that are inconvenient to attach to. These are things that are misusing NFC though, I don't think it was originally designed for it : ) Having a way of using wireless power to do it on the other hand, (say in conjunction with BLE or WiFi and crypto or other security related features in processors or other devices) could be very interesting, because then you've got the resources to implement things a lot more securely. And only low power may be needed (especially with BLE) so it could be very compact.

    Maybe it's a new use-case : ) Not sure.

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  • dougw
    dougw over 4 years ago

    I worked on wireless power to an artificial heart once, but on element14 there are different projects:

    The KLINGMAGON Subspace Probe

    LED Road Test - 3D Printed Housings - blog 2 Nov 10

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