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4hv.org :: Forums :: Tesla Coils
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SSTC polarity

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Avi
Sun Aug 09 2009, 01:37PM Print
Avi Registered Member #580 Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
I have an SSTC setup in which the driver is a manually adjusted frequency oscillator which drives the GDT of a full bridge.
The full bridge is powered by an isolated transformer.
The question is, when i adjust everything such that it is functioning, why is it when I reverse the polarity of the primary coil or the GDT input does it barly work at all.
Note: re adjusting the frequency does not cause it to work.
Since there is no feedback, and it is fullwave squared AC, i can not come up with any simple explanation.
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Mads Barnkob
Sun Aug 09 2009, 02:21PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
It is caused by your primary and secondary circuit being 180 degrees out of phase, so very little power is transfered.
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Avi
Sun Aug 09 2009, 03:49PM
Avi Registered Member #580 Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
MadsKaizer wrote ...

It is caused by your primary and secondary circuit being 180 degrees out of phase, so very little power is transfered.

Avi wrote ...

Since there is no feedback, and it is fullwave squared AC

No feedback, therefore phase is irrelevant.
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Sulaiman
Sun Aug 09 2009, 05:57PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Sounds peculiar to me,
what happens when you reverse BOTH the GDT and the primary phase?
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HV Enthusiast
Sun Aug 09 2009, 06:14PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Doesn't make sense.

Sounds to me like you may be inadvertently affecting something else or not making a proper connection when you are switching polarity.
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LithiumLord
Mon Aug 10 2009, 11:20AM
LithiumLord Registered Member #1739 Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Just a guess - your control electronics are unshielded, right? If they are, you already know what to do ;)
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Avi
Fri Aug 14 2009, 12:12PM
Avi Registered Member #580 Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
Sulaiman wrote ...

what happens when you reverse BOTH the GDT and the primary phase?
then it works again

i also don't get a sharp resonant response in the not working polarity if that signifies anything?

LithiumLord wrote ...

Just a guess - your control electronics are unshielded, right? If they are, you already know what to do ;)
hm, but it can be unshielded if i connect it a particular polarity?
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