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Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
Hello guys. I'm working on a power transmitter. The transmitter will be an series LC drived by a full-bridge and a pulse-skip controller. The L will be the transmition coil. This appear to be working fine.
My problem is at the receiver. I tryed a parallel LC with a lamp in paralel. It worked. But I wanna to power a small PC, so I need to rectificate the power and charge a capacitor with DC.
I tryed a recitifier in parallel but it appear to not work. I think is because this is changing the ressonant mode of the receiver LC because its not a resistive load.
My idea is to use a PFC boost to charge this capacitor. The input of the PFC in parallel with the receiver LC, so any load will appear resistive to the LC. But this have some problens too. The PFC need to run at least 10x faster then the ressonant frequency of the transmitter.
Here's the basic rectification circuit for a wireless receiver. Note that the four diodes have to be very fast diodes, not your standard mains type. The parallel LC on the left is your receiver coil and resonant capacitor.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
My simulations suggest inductively coupling to the receiver circuit with a step down works reasonably well. If you just take off the LC circuit it tends to draw too much current and kills the resonance.
If you do a step down, you can match the impedance more easily.
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
My simulations suggest inductively coupling to the receiver circuit with a step down works reasonably well. If you just take off the LC circuit it tends to draw too much current and kills the resonance.
If you do a step down, you can match the impedance more easily.
I think you are right. I will do some simulation here.
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Power Transmitter
