View Single Post
Old 06-11-2011, 02:03 PM
cody cody is offline
Senior Member
Join Date: Jun 2008
Posts: 407
Yeah I will need to use Mhz to get it into resonance. I can only play for now but I can learn some things. Putting my hand near it does afect the transfer but I have to get it within a few inch's.

Yeah today I make a base for the receiver for testing the distance transfer.

I am using a square wave but it isn't 50/50. Rectifying and storing the output is proving to be difficult. I have an idea from the testatika machine, U shaped magnetised transformer core's or just a steel core transformer might work.

I guess when the transmitter is in resonance the receiver will output a sine wave so that will be much easier to use than the scratchy wave's at the receiver now. An Ultra fast recovery FWBR might also help with storing the output.

I am thinking my Bob Boyce transformer might be good to use on it if I construct a resonant AC tank with series inductors and caps. It will idle with very low standby input and the output is kind of AC but I have it pulsing about 18 times at 2 us then a pause to the next group, could be worth a look for the fun of it I should maybe reconfigre the controller to three phase (three single pulses).

This is what the waveform from the secondary of my transformer looks like. I can make it so there is no pause and all 2 us pulses with 2 us between, well I think I can. However if I reconfigure the controller to three phase I can tripple the effective frequency and hex it if the output is AC.

What happens if I use AC to excite the primary ? Is it better or worse than DC for the primary power ?
I prefer using AC for these small tests, you get twice the voltage on the primary that way. Even better is AC square wave, that will smack it real good and get an even greater voltage gain on the secondary. Also with AC you can insert a series capacitor with the primary to form a series tank circuit and that will ramp up the voltage on the primary much higher if designed correctly. But your setup seems to be working real good, Im not really familiar with the circuit you are using but it appears it is inputting a higher voltage than the 12V battery you are running with. Have you measured the voltage it outputs to the primary? DC setups in my opinion seem to become advantageous for overcoming the engineering difficulties of getting really high voltage onto the primary at high frequency. For your recovery on the receiver try to hunt down some 1n4148 diodes. You can usually find them in junk electronics, they are very small and glass. I find them to work great for these little setups.
Reply With Quote