Wireless Power Transfer Demo Kit

6 Mar 2018

For one of my courses this year we have to design a demo/educational kit demonstrating an electromagnetic phenomenon, our group has chosen Wireless Power transfer.

Our current idea is to design a kit with two WPT antennas on a slider to demonstrate the effect of distance on the efficiency of the coils, and to have the coils interchangeable. The biggest problem we are currently facing is finding examples online of simple WPT systems proving numerical theory, we either find basic wound coil systems on the likes of instructables, or full thesis on designing an complex WPT system. I would like to ask if anyone knows of a relatively simple WPT paper (or website) which we could use as a starting point?

Here is a quick screenshot from Fusion 360 on Android of the initial design for the kit.

Top Comments

djfraz over 6 years ago

Thank you everyone for the information, sorry for the late reply to them

Thankfully my group have agreed that i will do the mechanical design and write the report, as i am not the best when it comes to electromagnetic theory, but i will pass on the information to them and hopefully post the completed project here as i want the demo kit to be an open source design. Maybe even someone in the e14 community would like to build and use it.
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sleuz over 6 years ago

Hey Duncan

We have an app note up on e14 covering alignment, coupling and proximity of wireless power coils.
ANP014: Wireless Energy Transmission Coils as Key Components

We have a few more on WPT, which might also be of interest for you and are worth having a look.
Wireless Power Charging Coil Changing Considerations

Proprietary Wireless Power Transfer Solution for High Performance including Data Transmission

Hope, this helps. Let me know, if there is anything else you needed.

Regards
Simon

P.S.: Thanks mcb1 for the mention!
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mcb1 over 6 years ago

There was some experiments done during the "Beyond the Phone: design challenge.
Depending on the WPT protocols, you may find the communication during the negotiating phase limits the distance, rather than efficiency losses.

sleuz may be able to assist with your question.

Cheers
Mark
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dougw over 6 years ago

You can also explore how and why having the both coils operating at the same resonant frequency improves power transfer.
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shabaz over 6 years ago

Hi Duncan,

You may also want to experiment with a larger diameter, so that you need less tolerance in the physical design for accurate placement of the individual pieces.
Also, since you may want to allow the experimenter to be able to plot the efficiency versus distance, some way of easily changing the distance, when the coils are close. An example could be somewhere known thickness shim could be placed (e.g. multiple 1mm thick plastic strips, etc).
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