Description
Inductive powering is a way of getting power into a device without a direct wire connection. Inductive charging is commonly used in rechargeable electric toothbrushes – you may have noticed that you recharge it by placing it into the holder, but there’s no direct plug. These chargers work by taking a power transformer and splitting it in half, an AC waveform is generated into one, and couples into the second coil.
You can draw as much as 1A if the coils are approx. 3 mm apart. As the distance increases, the current transmission will reduce. If you need very little current, the coils can be up to 15mm apart. Any non-ferrous/non-conductive material (ex. air, wood, leather, plastic, paper, glass) can be used between the two coils. The material doesn’t affect the distance or efficiency. The coils do need to be fairly co-axial, try to get them to be parallel and have the circles line up for best power-transfer.