Contactless Energy Transfer - components ?

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#1
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Hello,

I want to make a product that is completely water-tight but can be charged. On-board energy storage is done with supercaps (50F/2V5) and IO want to charge them via some kind of contactless energy transfer like the way you see in electronic toothbrushes.

Charger and product can be placed on each other to charge but I dont want connectors. Are there any standard components/coils or application notes for this application ? Charge current=100 to 500 mA

I'm mostly worried about CE/UL testing

Thanks

paddy

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Idea: have a hole in the bottom. Charger 'primary' has a ferrite rod that sticks in the hole, but its a waterproof cylinder. Secondary gets the flux from the ferrite rod. Shottky diode half wave recifier charges the cap.

Imagecraft compiler user

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Pot core transformer. Drive with high frequencies. 1/2 in the charger base and 1/2 in the product. Keep the intervening layers as thin as practical.

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or have a look on how it is done on an electrical toothbrush.....

also have a look at recharchable lithium batteris instead of the super cap... for power holding capasity after mains power failure.

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Thanks for the information. I also found P2110 modules which might be usable for wireless energy transfers.

The reason for me to use supercaps is that I want to charge the product within max 2 minutes. Or I should use some construction where I can replace (lithium) batteries and deliver with 2 battery packs.

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beware that super caps have a rather high self discharge current ( although they have improved over the years)

so charging is to be done in 2 minutes, and how long should it be up and running then?

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Charging for 2 minutes, up and running for 45 minutes each time. Works great for my application. We use this principle now for a couple of years without trouble.

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Check this site - I think this technology/products are quite interesting.

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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Thanks MBedder, This might be a solution

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Reaction to my own question... I also found
http://garden.seeedstudio.com/index.php?title=Wireless_Power_Supply