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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
So no one knows why that kind of voltage is showing? I re set up everything on peg board for ease, and I still get 100v out. I did get a 12v 7W car headlight bulb to light brightly, but it was no great thing considering the coil was right up to it, and the source coil was drawing massive current (enough to make the capacitor lead glow orange and IGBT instantly boil water). The light turns on when I use a square wave, and adjust the offset, though the offset causes massive heating on the IGBT.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Getting higher efeciancy is possiable, I just wanted to push the limit and see what would happen. From my tests, square wave gives a better output due to the gate drive, but the end result will always be sine due to the resonant action.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
The whole point of using parallel resonance in this circuit is to allow for great reactive current to circulate in the loop while having amplifier provide only the real power required.
If you take a a closer look at my video, you can see that I used a 10mm copper pipe for my 'coil', and 8 paralleled capacitors to assure highest possible current handling capability. Capacitors are 6.8nF 1000V wima fkp1, and they get hot in the circuit. It's pretty obvious that little ceramic capacitors aren't going to last in this kind of use -they are mostly intended for DC filtering and have high dielectric losses at these frequencies.
There is over 25 amperes continuously flowing in the tank circuit and 6mm copper pipe I used previously would actually get hot in prolonged operation. The receiver coil is rather undersized 3mm copper wire, which gets hot and apparently wastes as much as 5 watts of power.
I don't want to be evil, but I just don't think you guys have enough xp points to actually even produce 1kW of power in low Mhz range for extended periods of time. I'm not sure if I have either, despite the simplicity of the intended topology.
The resonator itself must be designed to be able to dissipate majority of this power as heat.
The simplest approach for higher power levels would be to basically build a SSTC, and then replace the secondary with a low impedance resonator and take current feedback from it.
You could perhaps use some simple Vaccum tube oscillator as well, like the original MIT experiment did.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
I do not think I have enough experience yet either, but that is my long term goal. I do realise that ceramic capacitor's are not very good, hopefully i can get my hands on a induction heater capacitor. I am not going high power now at all, I am just trying things with low power, less than 5W.
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Wireless power- my own setup and questions
