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PSQCW DRSSTC

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BSVi

Wed Jun 08 2011, 04:38PM

Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83

I'm started my new project. Essentially, it's QCW DRSSTC, but instead of controlling bus voltage, i'm going to skip some pumping periods (that's what PS stands for).

What I have up to date is a part of future schematic, swcad model, and main part of cpld firmware.

Simulation demonstrates really good perfomance, so i'm going to build this in "metal". The resonator itself is 75mm diameter 150mm long pipe, winded with 0.18mm wire + small toroid. Resonant frequency is 377kHz. The primary will be high-impedance one - 30turns@3mm litz + 3.2nF cap.

Just wanted to open project thread :)
]svarog.pdf[/file]

BSVi

Wed Jun 08 2011, 04:43PM

Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83

Sorry for double posting, but the the forum doesnt allow to upload rar's and jpeg's (yes, jpg are allowed, and jpeg's are not). And I for some reason can't add files to my previous post, so doubleposting.

]svarog_model.zip[/file]

Ash Small

Wed Jun 08 2011, 05:34PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

You can add files by posting them in the 'attachments' section, then using the 'edit' facility, and 'copy' and 'paste' to copy them into the original post.

It's a bit long winded, but it generally works in the end.

Goodchild

Wed Jun 08 2011, 07:53PM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

Hmm interesting idea. Looking foreword to seeing more.

Mathias

Wed Jun 15 2011, 07:23AM

Registered Member #1381 Joined: Fri Mar 07 2008, 05:24PM
Location: Hungary
Posts: 74

The controller will set the allowed maximum current after the first trip ?

Steve Conner suggested , by feeding a ramped signal into the OCD comparator, that should simulate somewhat QCW-ish mode of operation.

Goodchild

Thu Jun 16 2011, 09:00AM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

Mathias wrote ...

The controller will set the allowed maximum current after the first trip ?

Steve Conner suggested , by feeding a ramped signal into the OCD comparator, that should simulate somewhat QCW-ish mode of operation.

You know I'm interested to see if that would have the same effect, because in my work whit the QCW the current don't really change or "ramp" much over the period of the burst. As seen here.

5592614645 7a97939afd

This is true for the primary circuit at least. As for the secondary current and voltage well that gets a bit more complex but, from what I have seen from Steve Ward the voltage of the spark itself also doesn't change or "ramp" much over the period of the burst. SO what changes as the spark gets bigger? Well the secondary current would be an indicator but I still need to do more thinking on this.

So in short what I'm tiring to say is that I don't think you would get the same effect by slowly adding cycles to the burst to control current. I think practically the way to do it would be with voltage control.

But we will see! Interested to see more. keep up the good work!

Eric

BSVi

Thu Jun 16 2011, 10:07AM

Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83

>The controller will set the allowed maximum current after the first trip ?
The controller sets maximum allowed current all the time, regardless of trip count.

>in my work whit the QCW the current don't really change or "ramp" much over the period of the burst
Thank you for this information. I thought primary current is changing druing voltage ramp.

Anyway, I'll try my approach. If linear current ramp wouldnt work, I'll be able to reproduce your primary current shape to mimic conventional QCW.

BSVi

Fri Jun 17 2011, 01:29PM

Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83

Finished layout for my prototype. The PCB is fairly complex, but i think i'll manage to manufacture it at home.

101111

Sat Jun 18 2011, 07:49AM

Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263

This is great, always love to see something new here at 4hv!

BSVi

Mon Jun 20 2011, 12:19PM

Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83

I have some progress since last post:
1. I have manufactured PCB, it turned out not as complicated as I thought it to be.

2. I wrote firmware to have something to get up and running quickly when parts arrives.

The blue trace is "interrupter". Tesla starts up at 0->1 transition and runs till 1->0 transition occurs. After that controller waits for zerocrossing and shuts down.

The yellow trace is desired secondary current. You can notice a little offset at te begining - it was introduced to allow tesla to start up.

The white trace is "nRESET" signal. This signal is required to reset interrupter logic if no zerocrossing occured after interrupter's 1->0 transition.

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