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Forum Wirelessly powering an LED strip
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  • Replies 10 replies
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  • wireless energy transfer
  • colpitts
  • wpt
  • led
  • transfer
  • wireless
Related

Wirelessly powering an LED strip

MisterPonda
MisterPonda over 2 years ago

Hello everyone

I want to make a little project so I can wirelessly (just a few centimeters) power an LED strip (just a short section) using a transmitter and reciever coil.

I have a 6V 4Ah lead acid battery. I want to use this as the input. I want to convert this to an AC signal around 100kHz and connect the transmitter coil to it. 
On the other side I will have the reciever coil that goed to a rectifier and then to the LED strip (5V 1.9W).

What is the best (and most simple) way to do this? I was thinking about using a Colpitts Oscillator. Can this work?
Also is the battery ok or should I just start with a 12V voltage from a bench psu to make my life easier?

imageimage

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  • dougw
    dougw over 2 years ago +3
    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: …
  • dougw
    dougw over 2 years ago in reply to MisterPonda +2
    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…
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  • dougw
    dougw over 2 years ago

    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 

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  • MisterPonda
    MisterPonda over 2 years ago in reply to dougw

    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? 

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  • dougw
    dougw over 2 years ago in reply to MisterPonda

    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.

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  • MisterPonda
    MisterPonda over 2 years ago in reply to dougw

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

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  • dougw
    dougw over 2 years ago in reply to MisterPonda

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

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  • MisterPonda
    MisterPonda over 2 years ago in reply to dougw

    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/.../

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  • dougw
    dougw over 2 years ago in reply to MisterPonda

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

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  • dougw
    dougw over 2 years ago in reply to MisterPonda

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

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