Inductive charger

I'm going to design an inductive charger and I have a lot of open questions and don't really where to start. I know about the principle how it works. I need help with several things.

The idea is to get 5-7VDC out oin the secondary side, and something like 100mA would be nice.

First of all, what switching frequency is suitable concerning size and efficency of components, and also regarding type approval issues? I think electrical toothbrushes uses approx. 60 kHz so maybe that is a suitable frequency.

Secondly, does anyone know about a design example I can use for a start?

Does anyone have any suggestions for suitable inductors? Supplier, part number etc?

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0 SteveH over 15 years ago

These can be quite simple and use 60 Hz - Just think of it as a transformer with really bad coupling or high leakage inductance. It may not be the most efficient, but for the kind of application it does not really matter much. My toothbrush uses just this simple of an approach. A 60 Hz, poorly coupled transformer to charge the batteries in 24 hours.

Also see,

http://en.wikipedia.org/wiki/Inductive_charging

HTH - Steve H.
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0 SteveH over 15 years ago

These can be quite simple and use 60 Hz - Just think of it as a transformer with really bad coupling or high leakage inductance. It may not be the most efficient, but for the kind of application it does not really matter much. My toothbrush uses just this simple of an approach. A 60 Hz, poorly coupled transformer to charge the batteries in 24 hours.

Also see,

http://en.wikipedia.org/wiki/Inductive_charging

HTH - Steve H.
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