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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
First I'd try making the feedback transformer with larger amount of turns, maybe 50+50? It could be just that it isn't reaching the threshold voltage?
Actually I reduced the ratio by half by pulling the ground lead again through the core, and got somewhat better. If I get inot need to use such large amounts of turns I may probably just go for a cascaded CT - the base current is still pretty low and I don't think I need that.
Secondly, I recommend using a 555 to kick it to oscillation. I haven't had any trouble doing this and it seems reliable.
If I use oscillator start, the coil will turn on whenever the bridge gets powered and my remote is turned on. I was thinking how to eliminate that possibility and make the coil controllable only by remote.
It would actually work as is if I was running CW, but oscillation would stop if voltage gets too low, unless my feedback is very sensitive (which it apparently isn't).
This would also give free short circuit protection of the output.
I'm thinking if I could stuff in some kind of simple logic to preserve all these ideas.
Also, when you use an interrupter, the gate driver should send out a small pulse every time it's enabled at the beginning of each interrupter cycle, kicking it into oscillation. Atleast I think it does that.
When inverting and non-inverting UCC's are enabled the output of inverting one is driven permanently high, and if oscillation doesn't start and there is no DC blocking capacitor, mosfets die.
That is one of situations I wanted to avoid.
Just enabling the drivers in my scheme would do nothing because both inputs are held low by the CT. I start the circuit by putting a small pulse, only few microseconds long, into input of one UCC.
I think that is a much more proper way of startup, + I got rid of 5V logic and propagation delays.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
It looks that the topic of this thread went little bit far away from the wireless powering and turned to designing problems of an, otherwise very interesting, full bridge SSTC. I think it's a pity because as I can see here Marko just have made a real progress in wireless energy transfer using his coil and I’m sure not only me would like to know more about it…
Marko please, would it be possible to refresh this thread or start a new one giving the explanation to your pictures in the “cool pics†thread?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
for nearly everyone
Well.. ''where's everybody?'' -fermi
OK, I'll see what I can do, I'd like to cover everything which takes some time.
My professor over here is probably the most amazed - he wants me to patent my ''invention'' O_o I really need to stay away from the press if I get onto this competition.
This particular SSTC is having some trouble I'd like to fix first, it's main inverter wasn't running in pics on chatting board but little one nearby.
I built some kind of stand for receiver resonator, still have to do capacitive ground points... that's going to be something simple, probably AL foil on PVC sheet, or something like that.
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Wireless powering SSTC
