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  • Author Author: ctammann
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Wireless power experiments

ctammann

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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  • 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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  • 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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