Wirelessly powering an LED strip

You will need a power oscillator.

I did a project that used a single chip power oscillator for wireless power that might work - depending on how much power you need.

You can see the circuit here:

 The KLINGMAGON Subspace Probe 

I did a higher power oscillator for this project:

 Polymer Cap Charge Pump 

Thanks a lot! This is really helpful. I have a question. The coils you used were printed on a circuitboard. I want to make the coils myself using coilwire. Do you have any advice regarding the size that I should make the coil? 

Not sure if it helps any but there was a student project doing something similar for a POV display. The power was wirelessly coupled to allow the LED pixel strip to rotate.

https://michael-crum.com/pov_display/

They used a $25 power supply from Amazon.

There is a photo of the secondary coil winding to show the size.

There is a video of it in action here:
https://www.youtube.com/watch?v=vRa5mGe45jk  

Wire coils work even better than PCB coils. I made the receiving coil resonant at the oscillator frequency (by adding a capacitor) to maximize efficiency.

The larger the number of turns the higher the impedance.(less drive current needed, but less power transferred) 

The larger the diameter of the coil, the longer the transmission distance.

Thanks! Any tips on where to get the max256? I was looking online but dont really see them available. I am from belgium

This one may help too: www.youtube.com/watch

They are in stock at multiple distributors. You can search for MAX256ASA+

Would I be able to use something like this? This would be delevired withing 2 days. The max256 chips would take a long time to arrive. 

www.amazon.com.be/.../

To be honest, I think you're better off to use a commerical Qi wireless transmitter and receiver, although depending on the distance and power, maybe it is a stretch as some will do quite a few watts, but not at any distance!

Doing something like you proposed is potentially very dangerous because what you're doing is essentially building an unregulated radio transmitter! If your signal is switched quickly (square waves) for efficiency, your 100kHz carrier will have (theoretically) infinite harmonics at every 100kHz (i.e. 200, 300, 400, etc.) but with somewhat decreasing power. This will cause interference to radio transmissions and potentially may generate stray electric fields that may cause equipment nearby to malfunction. Sure, a small coil at such low frequencies is not an efficient radiator and you're probably relying more on inductive coupling rather than on radiation, but the unintended effect can make your device very unwelcome especially in sensitive environments (e.g. labs) or if you cause disruption to legitimate services (e.g. aviation NDBs, long-wave, short-wave and medium-wave broadcast radio).

- Gough

The oscillator would work, but it needs a power amplifier to drive the coil.