Author Topic: Pulse skip coil using profdc9 tht ud2.9  (Read 990 times)

Offline oneKone

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Pulse skip coil using profdc9 tht ud2.9
« on: April 16, 2020, 02:25:19 AM »
Sooooo.

This is going to be my attempt at a pulse skip coil! I've wanted a pulse skip coil for a while now, and also *hopefully* after I finish building this coil the AUD would have recovered a little bit and I can continue in my drsstc 4.

Basically I don't have a real direction as of yet, I do have a secondary, an idea of what I want to use as a bridge, But most importantly I know what driver I'm going to use! @profdc9 tht ud2.9.

Specs so far:
Secondary: 230mm diameter, 530mm winding length with temco 22awg wire.
Primary: probably 6.35mm copper tube, Unknown if helical, spiral or an inside down U.
Bridge: for the time being a parallel half bridge of skm100gb125dn, mostly to help and to see heat dissipation.
MMC: for the beginning I'll just borrow them from the drsstc 3.
Driver: profdc9 tht ud2.9

No idea on bus yet. I do have a few solar inverters. I might just parallel "a few" capacitors I salvage from those.


The build:

I decided to build a winding jig on the router (the CNC router write-up is coming), in the end this will be multi purpose for all future coils, unless I build a CNC coil winder. The winder is just the cheapest drill I could find plugged in to a variac for speed/torque control, and the other side is just a housing with 2 X 608zz bearings with an er11 reduced shank.



I think winding took about 1/2 an hour from setup to finish.


« Last Edit: April 16, 2020, 02:26:54 AM by oneKone »

Offline profdc9

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #1 on: April 16, 2020, 03:44:33 AM »
Cool.  Let us know how it turns out.  I may try building another coil, especially if I can get access to more power than available in residential mains in the USA.  We have about a limit of 1800 W per circuit.  That is very easy to exhaust using skip pulse if you have long pulse times.  I have thrown the breaker many times and blown many fuses operating my coil. :)

Dan


Sooooo.

This is going to be my attempt at a pulse skip coil! I've wanted a pulse skip coil for a while now, and also *hopefully* after I finish building this coil the AUD would have recovered a little bit and I can continue in my drsstc 4.


Offline Hydron

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #2 on: April 16, 2020, 04:58:45 AM »
In theory in NZ we are limited to 10A*230V=2300VA per device, but 16A or 20A circuit breakers are common, so you can push it to 4+kVA pretty easily, though I've certainly tripped breakers there.
The UK has even more headroom - the plug is fused internally at 13A max (giving ~3100VA at 240V), but would literally handle hundreds of amps given the huge pins, and the circuits can be up to 32A or so. Kettles etc certainly work better in the UK (at 3kW) than in the US!
The northern europeans probably all have 16A 230V circuits in addition to 3 phase 10kVA+ options even domestically, lucky bastards!

Regarding keeping a long pulse time coil happy on a limited mains circuit, I've plans on the back burner to build a software-controlled active PFC with input current limiting. As long as the voltage on the DC bus caps at the end of a pulse is above the peak mains voltage (easy at 120V) you'll always have control of power, and in addition you'll draw your current as real rather than reactive power, also maximising the use of a limited mains supply.

Offline davekni

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #3 on: April 16, 2020, 06:17:39 AM »
Yes, US power is limiting, and no 3-phase to residences. :(  I've just started making a Y extension for my dryer outlet, which is 240V at 40A.  Previously I've been "cheating", using two different 120V 15A circuits to get 240V at 15A.  To help with power, I made a crude PFC, which has good power factor at full load only.

For an alternative, my original SSTC has one controller running two independent H-Bridges on two independent 120V 15A line circuits (8-output GDT).  That's a bit safer, and can use any two outlets even they are of the same side of the 240V.  Here's that coil:  https://highvoltageforum.net/index.php?topic=1021.msg7119#msg7119
David Knierim

Offline oneKone

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #4 on: April 16, 2020, 07:22:27 AM »
Will do dan, tbh I'm not sure why I haven't seen anyone use your tht boards. They work flawlessly.

I think I'm just semi luck in Aus. I do have a 15a circuit with a 25a rcbo. So in theory a max of 5.7KW, one guy in my neighbourhood had 3 phase 85A line installed when he first built. It's interesting to see what other countries have, seems like a standard is out the window!

Offline John123

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #5 on: April 16, 2020, 07:51:01 AM »
The UK has even more headroom - the plug is fused internally at 13A max (giving ~3100VA at 240V), but would literally handle hundreds of amps given the huge pins, and the circuits can be up to 32A or so. Kettles etc certainly work better in the UK (at 3kW) than in the US!

Assuming both legs of the ancient ring mains are both intact! That's one of the problems with a country of old housing stock, so many things are in a state of decay and hidden from view.

Offline Netzpfuscher

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #6 on: April 16, 2020, 11:33:56 AM »
In Germany 3 phase 400V is very common. A house is normally fused with 63A NH00, which is 43kW continuous. For around 1 minute you can peak to 100kW until the fuse blows ^^ It's a very nice country for coilers  ;D The 400V results in 565V on the DC bus, so you don't need any step up.


Offline profdc9

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #7 on: April 16, 2020, 02:27:42 PM »
The device could use an improvement from PFC, but I think the trip is primarily from overload and not from peak instantaneous current.   I can run briefly with high power before the breaker trips, for example, I can go as high as 30 A temporarily until the breaker trips or the fuse blows in the variac. 

One interesting thing I would like to try with the skip pulse circuit is to make a very high impedance primary like you would with a QCW DRSSTC, with may turns on the primary flat coil and less capacitance.  This would increase the number of cycles needed to reach peak voltage before the pulse skip kicks to be more like a QCW tesla coil.  Other aspects of the design would have to be more like a QCW tesla coil too, such as a high resonance frequency, so very small primary capacitance and a low inductance, short secondary coil.

Also another place I think the skip pulse behavior could be useful is for induction heating.   The tesla coil driver could be easily adapted for this purpose, even if it is overkill.  If there is a great dissipative load in a work coil (hunk of metal), the current through the work coil can potentially be quite high because the tank resonance is damped.  Skip pulse can prevent excess current from flowing in the primary circuit, feeding the power to the secondary at the rate at a rate limited by the overcurrent trip value.  Therefore it might serve as a simple way to regulate power to the inductive load.

In theory in NZ we are limited to 10A*230V=2300VA per device, but 16A or 20A circuit breakers are common, so you can push it to 4+kVA pretty easily, though I've certainly tripped breakers there.
The UK has even more headroom - the plug is fused internally at 13A max (giving ~3100VA at 240V), but would literally handle hundreds of amps given the huge pins, and the circuits can be up to 32A or so. Kettles etc certainly work better in the UK (at 3kW) than in the US!
The northern europeans probably all have 16A 230V circuits in addition to 3 phase 10kVA+ options even domestically, lucky bastards!

Regarding keeping a long pulse time coil happy on a limited mains circuit, I've plans on the back burner to build a software-controlled active PFC with input current limiting. As long as the voltage on the DC bus caps at the end of a pulse is above the peak mains voltage (easy at 120V) you'll always have control of power, and in addition you'll draw your current as real rather than reactive power, also maximising the use of a limited mains supply.

Offline oneKone

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #8 on: May 05, 2020, 12:11:39 AM »
@profdc9, I like the idea about the induction heater,

So this project is moving a bit more slowly than i.first anticipated! I ended up ordering capacitors vs using the ones I have, I didn't really want to break down a coil for another project. I got the tip for the capacitors from Tesla explorer, they're 0,1uF 2000V MKP+ RIFA PHE 450.

I've also almost completed the ud2.9 board, I'm just waiting on a fibre receiver.... Unless for the time being I use a toslink receiver.

Offline oneKone

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #9 on: May 13, 2020, 04:47:28 AM »
So this project is going to take a massive turn! Some time has past on the original build. I've switched to a smaller secondary and have tested the driver.... And boy does it work!

Secondary specs are 110mm diameter, 170mm winding length 0.25mm double build copper wire. I've driven an skm100gb125dn over 350khz at 500a, 1.2ms on time!

Teaser picture!

The streamers are over 760mm! On a very lash up build.

I understand my format for posting is very messy, but with this build that's going to change! I plan to take pictures and document every aspect of this build, the way I work things out, the way I design and make parts, with the exception of the driver and feedback current transformers.

Looking forward on finally getting properly started in this build,
Chris

Offline Mads Barnkob

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #10 on: May 14, 2020, 11:31:44 AM »
I understand my format for posting is very messy, but with this build that's going to change! I plan to take pictures and document every aspect of this build, the way I work things out, the way I design and make parts, with the exception of the driver and feedback current transformers.

Looking forward on finally getting properly started in this build,
Chris

Congratulations on the great results, you are really getting something out of that small SKM100!

Looking forward to see the building progress, did you get in videos of those 76 cm sparks?  8)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
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Offline oneKone

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #11 on: May 15, 2020, 05:33:30 AM »
Cheers,
Tbh these bricks have surprised me! After probing VCE I've found the max for these bricks are 300khz, beyond that the waveform become, for the lack of a better word, trash 😂. I do have a video but it's only 8 seconds long, I'm going to push to get the new MMC and a proper primary support made this weekend. Along with some videos of it running.

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Re: Pulse skip coil using profdc9 tht ud2.9
« Reply #11 on: May 15, 2020, 05:33:30 AM »

 


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