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Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Some of those scope shots do look very familiar!
I will try to see what happens if i put a power resistor across the bridge output. This may just explain why it works on ud1.3 since it has much more sensitive feedback.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
This is very exciting news :)
I hope Steve Ward will one day find time to update his website to contain all links to the vast amount of useful information he have online but unlinked :)
I will report back when I have my driver back from Sync.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hehe, good to hear you got it fixed. Strange that since I started thinking about DRSSTCs (though still not built a serious one), I've always seen the need for a discharge resistor which sets the initial charge on the cap. But I have not linked it with your problem, even though the solution was at the back of my head all the time.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Glad to have been able to help sort this frustrating problem. On the bright side, it sounds like Kizmo has a spare bridge and controller for another coil (twins?)!
In testing my coil I hadn't noticed any issue with startup at certain initial voltages, but I had noticed changes in the voltage spikes for the first cycle or two, depending on initial voltage. As this wasn't causing me any issue I didn't bother investigating further at the time.
I subsequently came across Steve's paper while looking for something else, and it inspired me to add a resistor to my bridge when I made some other changes to it. I haven't yet investigated the effect it had, though I intend to do so, as it could be helpful for perfecting phase lead on early cycles.
Anyway, credit is definitely due to Steve Ward for his investigation, and to the other contributors to this thread, it was just good luck that I'd been thinking about the capacitor voltage issue when the thread got new replies and I checked it!
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Aaand the plot thickens.
After getting this UD2.1 i got from slawinski running fine I went ahead and took my trusty old trouble maker UD2.5 out and guess what: It still wont work correctly!
Now it starts fine but still skips half cycles, switching several times at transitions and other weirdness described before. Then i swapped Slawinskis UD2.1 back and it works really well again.
Registered Member #2694
Joined: Mon Feb 22 2010, 11:52PM
Location: Russia, Volgograd (Stalingrad).
Posts: 97
check the interrupter output PWM generator signal. 555's out or whatever you use.. once upon a time, I had issue, that some positions of uSec had in 1 pulse multiply - 20-30 same uSec pulses with few off time parts inside 1 pulse. that's was bad 555 timer.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
I think this issue is finally fixed for good.
For some reason with phase lead enabled it required even heavier bleeder resistor. Right now everything works just beautiful and phase lead does its thing.
Final bleeder resistor was 4x 10k in parallel. Works well up to 700V bus.
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Weird intermittent problem with a DRSSTC driver (edit4: fixed?)
