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Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Uzzor, i tried it at 12v and it still doesn't work, also before the ps I was using a workbench ps at 30v 3A and it ran fine. AS for the semi's the 555 sends out a good square wave, the buz11 right after the 555 inverts the wave and its still a good square wave, and its a goodsquare wave into both fets, when I scope the connection at d5 and d6 and its a ramp wave form like a cap charge and discharge cycle, when I measure from the drains of the fets then the wave form gets all ripply, when its not connected to the primary.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
That proves the interrupter is working. You say the primary wire melts, which implies it is carrying lots of current. So either your primary drive fets are short, or the snubber system. Have you checked those too? Take scopeshots of the BUZ11 gates and drains. They should have a high frequency square-wave on them, modulated by the low frequency interrupter.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Since getting my new scope I thought I'd try it out on setting up the class E and Class E\F coil, but soon realized I didn't have the inductor I needed So I decided to try and see if I could fix the skori coil.
To jog folks's memory Most of us who watch Youtube know Skori as, , for details here's his website with Schematic, parts list in both semi english and I think Chek , after observing on a few of his pics and one or two of his videos I spotted my 1st mess up on the circuits interpretation ( or at least I think) originally I thought his primary was like this
, then basic coil theory ran threw my mind, if you have 2 coils going in a parallel fashion your not going to get a bigger voltage, so then I switched the primary to the correct way
, However I still had the problem with primary wires heating and melting the insulation. So I figured I'd take some scope shots and make a more thought out post with better descriptions and more info.
Anyways The interrupter works heres the Scope shot of the 555's output and after its gone through T4
, Then here's the wave forms at both T2 and T3's gates
, Now here is where the waveforms get real messed up, this next one is of the Gnd clamps of the scope probes are connected to the drains of T2 and T3 respectively and the probe themselves are connected to the (+) wire that leads up to the primary
, this next one is what the wave forms look like if I switch the probes and their ground clamps
. Now In uzzors last post he said test the snubber How would I check the snuber and\or where and which parts the active parts or the passive parts and this is the snuber part of the circuit correct?
Oh almost forgot all scope shots are without the coil connected!
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Disconnect the interrupter, that'll make testing easier. In the first picture, is that how you had the primary wound? The windings have to be out of phase to work, so wind one winding and tap it in the center like in the second pic. Give us the gate/source waveform of one mosfet, with no interrupter running/ disconnected, that will be enough to confirm/disprove any suspicions.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Yes the 1st picture is the way my Primary was. Here is the requested wave form shot (its actually both G-S) with no Interrupter and with the Primary connected.
I thought I'd take a Scope shot of G-s with the interrupter and the TC connected.
Also to note In both cases With the scope probes connceted the coil ran fine.
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