 DRSSTC PRIMARY WAVEFORM
|
|
|
Claude
|
|
Fri Oct 28 2011, 11:16AM
|
|
|
Registered Member #3379
Joined: Mon Nov 01 2010, 06:34AM
Location: Sydney, Australia
Posts: 24
|
Hi, just finished my drsstc. runs great producing 36" arcs to a target.I decided to scope the primary waveform and noticed that it had a strange shape. It has the correct number of cycles according to the pulsewidth but it dips halfway through the on time.I have attached a scope shot. Sorry about the quality.
I don't know what could be going on here. I was hoping someone could help. I've seen pictures of other primary waveforms and they rise to peak current then continue evenly until shutdown.
Specs are:4.5"x12" secondary with 30awg wire 4"x13" spun torroid
Flat primary with 0.25" copper tubing tapped at 4.9 turns
coupling 0.179
halfbridge with voltage doubler 400v buss voltage
resonant frequency 175Khz
primary current 350 amps
Thanks
Claude.
|
|
Back to top
|
|
|
Uspring
|
|
Registered Member #3988
Joined: Thu Jul 07 2011, 03:25PM
Location:
Posts: 711
|
I posted a similar question recently. See the reply in
Back to top
|
|
|
Gregory
|
|
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
|
What is happening is that yours primary are tunned at the same frequency of the secondary. You need to low a bit the primary frequency
|
|
Back to top
|
|
Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob
|
|
Powered by e107 Forum System
|
![Back to top](http://4hv.org/e107_plugins/forum/forum_viewtopic.php?126503<a class='bbcode bbcode-link' href='hyperlink"' rel='external' >https://4hv.org/e107_images/generic/bbcode/link2.png[/img]</a> url]</a><br /><br />My primary current looks much like yours. I believe the waveform comes from capacitive streamer<br />loading after rampup of the secondary voltsge. The loading capacitance changes the resonance<br />frequency of the secondary tank.
</td>
</tr>
<tr>
<td class='nforumthread2'>
<span class='smallblacktext'>
<a href='https://4hv.org/e107_plugins/forum/forum_viewtopic.php?id=127128#top' onclick=){kind=link}