Get a cheap DSO 138 oscilloscope :D
So the magnet wire roll have arrive,0.3mm,636m.
My question is that 110mm diameter,550mm long,1850 turns or 160mm diameter,380mm long,1260 turns secondary coil would work better for a SSTC or for a DRSSTC?
As a SSTC operates with long on-time, compared to a DRSSTC, I think the higher impedance secondary coil circuit would perform better. But I would someone else to comment on this, because I am not completely sure.
Now i have the components for the secondary let's see what can I do :D
The coil,as calculated should be:125mm dia.,485mm long(1:3.88),1620 turns.
I hope,that if I can make it,it will work with a SSTC driver,then maybe upgrade to DRRSSTC...
Mads: Secondary Q depends mostly on arc loading, so it is probably much lower than that calculated from wire gauge and skin effects.
I don't quite understand your remark on loading down the slayer exciter. I'm not familiar with that circuit. How do you load it down aside from blowing up the transistor or overloading the power source?
IGBT | Vce____ | Vce(sat)125Cmax | Icm____ | Gate charge___ | Combined switching time___ | Switchng losses |
HGTG30N60A4 | 600 V | 2 V | 240 A | 300 nC | 225 ns | 1 mJ |
IRGP50B60PD1 | 600 V | 3.6 V | 150 A | 250 nC | 180 ns | 1.25 mJ |
IGW60N60H3 | 600 V | 2.2 V | 180 A | 375 nC | 350 ns | 3.5 mJ |
IGZ100N65H5XKSA1 | 650 V | 1.9 V | 400 A | 210 nC | 480 ns | 2 mJ |
While I'm making the DRSSTC,I also rebuilt a fullbridge of 2xIRFP460 and 2xIRFP240,since I had these transistors.It still works very good.The power supply is around 120V,by putting some transformers in series,and it's still working after two days,which is a record for me :)
The interrupter is my scope's built in,connected to the UCC's enable pin,but I want to audio modulate it.The audio modulator in the Kazier SSTC 2 looks promising,but I would like to have cleaner sound,not the midi-interrupted type.Do you have any idea?
So basically a capacitor in the primary circuit doesn't effects the primary resonant frequency,and the important thing is to drive it at the secondary's resonant frequency?
I calculated my designs properties.At 150kHz,330VDC rectified mains,the 3×0,22uF caps have 23 ohm reactance.So if I remove one from the three,the current and the arcs size should increase?
After two days running at 180V,two IGBT died when I connected the inverter to rectified mains.Probably because I just hooked up a capacitor to make it double resonant,or because the GDT flashed over(I noticed this yesterday).Anyways as last attempt I replaced the failed halfbridge with a capacitor voltage divider and it is working now for 3 days!Well,it is not working now,because the driver has an issue;a smoothing tantalum capacitor shorted out and I have to replace it,but also upgrade a bit on the design and use a transformer instead of the ATX PSU.
I tried several things with this inverter,so far so good,it works like a charm expect the flashovers from secondary to primary even after decreasing the turns on the conical primary.
Yesterday I was looking for those fake QCW interrupters to create long and straight sparks and ended up with a combined Kaizer VTTC staccato controller and loneocean's RSSTC3 interrupter.I made this circuit on a breadboard,it was not working as it was supposed to,but probably due to bad connections on the breadboard.While testing it produced 40cm straight arcs to ground,which I think is really good.Sadly at this point the capacitor blew up and I couldn't make a video of it.
I have a video with 8 primary turns and with the complete conical primary.With that amount of turns doesn't exist flashovers,but with 4-5 turns the flashovers were significant.
I don't know why is the inverted working better with 2 transistors instead of 4!?In comparison with the fullbridge now it has +-325V/2 so like +-162V across the primary instead of the +-325V.Double the voltage,double the size of the arcs,if the inverter is working correctly,right?
https://mega.nz/#!ZeJVnKoR!FvYfJYxrESm7BmyOdQYU9mSWFapb9-rF1G6Ag1iQua4