Author Topic: DRSSTC impedance  (Read 1139 times)

Offline Marty

  • High Voltage Enthusiast
  • *
  • Posts: 8
  • Karma: +0/-0
    • View Profile
DRSSTC impedance
« on: July 12, 2018, 08:14:38 PM »
Hi everyone!

After a lot of reading, learning, doing calculations etc. I chose these specs for my medium DRSSTC:

Secondary coil: 20x80cm (8x32"), 0.5mm (24AWG), about 1454 turns, with toroid 81kHz and 48.5kOhm impedance (I want "smaller", but with low frequency about 70-80kHz)
I will be using CM300DY-24H, so I need low frequency to lower switching losses.
I wanted to use 16cm dia secondary, but the frequency will be a bit to high and if I use for example 0.35mm wire dia (27AWG) the frequency will be about the same, but impedance will be far away from "magic 50k".

But I saw other coilers (loneocans etc.) using 16x70cm secondary with 0.35mm wire (1850turns,f=80kHz, Z=61kOhm), so
I´m asking what is better, lower impedance (about 50k) or higher with more turns and more suitable h/d raito ?

Thank you for answers
« Last Edit: July 12, 2018, 11:46:33 PM by Marty »

Offline Teravolt

  • High Voltage Technician
  • ***
  • Posts: 101
  • Karma: +2/-0
    • View Profile
Re: DRSSTC impedance
« Reply #1 on: July 13, 2018, 03:22:21 AM »
a 4:1 is a good ratio and 80KHz I have calculated as 1/4 wavelength   http://www.procato.com/calculator-wavelength-frequency/     when you add a toride to the top and take in consider the distributive capacitance it will be less. when you have an arc from the top it will bring it down farther if you are concerned you could add another foot to the 8" coil or use smaller wire. At resonance your measured impedance should be the resistance of the wire witch is around 25.6 ohm per 1000 Ft. In reality it will be more    https://www.allaboutcircuits.com/textbook/alternating-current/chpt-6/q-and-bandwidth-resonant-circuit/

 I would use a tesla calculator to find your baseline coil and build the secondary and then tailor a primary with the resonant frequency to match using a o-scope and a sweep generator. there is plethora of projects hear

Offline Hydron

  • Administrator
  • High Voltage Engineer
  • *****
  • Posts: 291
  • Karma: +9/-0
    • View Profile
Re: DRSSTC impedance
« Reply #2 on: July 13, 2018, 09:08:00 AM »
Everything will still work if you don't hit the "magic" 50k - this is not an exact number by any means. The 160*700*.35mm type design worked well for me with the exact same IGBTs (pre "magic 50k" knowledge).

If you have the 20cm pipe though then bigger is better!

Offline Marty

  • High Voltage Enthusiast
  • *
  • Posts: 8
  • Karma: +0/-0
    • View Profile
Re: DRSSTC impedance
« Reply #3 on: July 13, 2018, 12:45:17 PM »
Thanks for your reply,
I didn´t buy the pipe yet because they dont have it (maybe some sign :D ).. so if the impedance is not that crucial, I will use 16x70cm and nice skeleton toroid which will also lower f and Z... Again, thank you for helping me with understanding this mystery :D

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1236
  • Karma: +17/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: DRSSTC impedance
« Reply #4 on: July 13, 2018, 09:00:52 PM »
Hi Marty and welcome to HVF

You got a good plan, known and proven to work components.

For a DRSSTC, a coil with a impedance around 50k is just a well-proven design and the performance is documented from numerous builds. Something like the high impedance and arbitrary waveform driven QCW coils really show that the impedance is by far not a determining factor for the performance.

As long as you don't get outside +/- 25k of the 50k, you are in the "safe" zone where it will be able to produce sparks, getting outside these boundaries should only be with experimentation in mind and not to build a well performing DRSSTC.

Looking forward to see much more about your build, please keep us update :)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

High Voltage Forum

Re: DRSSTC impedance
« Reply #4 on: July 13, 2018, 09:00:52 PM »

 


* Recent Topics and Posts

post Re: GM tube hv transformer
[Detection, Counting and Measurements]
shrad
Today at 12:32:39 PM
post Re: WTS:Power diodes "hockey Puck" MDF 652 02
[Sell / Buy / Trade]
rikkitikkitavi
January 27, 2020, 09:01:23 PM
post Re: WTS:Power diodes "hockey Puck" MDF 652 02
[Sell / Buy / Trade]
Da_Stier
January 27, 2020, 05:56:32 PM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
T3sl4co1l
January 27, 2020, 12:54:42 AM
post WTS:Power diodes "hockey Puck" MDF 652 02
[Sell / Buy / Trade]
rikkitikkitavi
January 26, 2020, 10:13:38 PM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
davekni
January 26, 2020, 04:55:49 AM
post Re: GM tube hv transformer
[Detection, Counting and Measurements]
futurist
January 25, 2020, 11:01:24 AM
post Re: CT performance investigations (Pearson and DIY)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
T3sl4co1l
January 25, 2020, 06:44:21 AM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
T3sl4co1l
January 25, 2020, 06:37:47 AM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
Andrew321
January 25, 2020, 02:22:09 AM
post Re: GM tube hv transformer
[Detection, Counting and Measurements]
haversin
January 25, 2020, 01:15:21 AM
post Re: GM tube hv transformer
[Detection, Counting and Measurements]
klugesmith
January 24, 2020, 10:53:42 PM
post Re: WTB [EU]: Cellular Sector Antenna
[Sell / Buy / Trade]
Da_Stier
January 24, 2020, 10:52:48 PM
post Re: GM tube hv transformer
[Detection, Counting and Measurements]
haversin
January 24, 2020, 10:29:14 PM
post Re: Problems with my first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
January 24, 2020, 08:16:12 PM
post GM tube hv transformer
[Detection, Counting and Measurements]
AlexanderHun
January 24, 2020, 06:24:25 PM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
rikkitikkitavi
January 24, 2020, 05:17:01 PM
post Re: My 833A VTTC
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
January 24, 2020, 04:37:25 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
justin66
January 24, 2020, 04:15:41 PM
post Re: My 833A VTTC
[Vacuum Tube Tesla Coils (VTTC)]
Mads Barnkob
January 24, 2020, 01:15:46 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
January 24, 2020, 01:10:38 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
January 24, 2020, 12:39:01 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
justin66
January 24, 2020, 11:43:08 AM
post Re: My 833A VTTC
[Vacuum Tube Tesla Coils (VTTC)]
kilovolt
January 24, 2020, 11:10:55 AM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
kamelryttarn
January 24, 2020, 10:11:51 AM
post Re: Doorknob vs Ceramic Disk
[Voltage Multipliers]
kilovolt
January 24, 2020, 09:03:52 AM
post Re: CT performance investigations (Pearson and DIY)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
January 23, 2020, 11:50:22 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
January 23, 2020, 11:42:56 PM
post Re: WTB [EU]: Cellular Sector Antenna
[Sell / Buy / Trade]
Mads Barnkob
January 23, 2020, 11:35:07 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
justin66
January 23, 2020, 11:15:12 PM
post Re: Doorknob vs Ceramic Disk
[Voltage Multipliers]
MRMILSTAR
January 23, 2020, 10:42:22 PM
post Re: CT performance investigations (Pearson and DIY)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
T3sl4co1l
January 23, 2020, 10:03:17 PM
post Re: Doorknob vs Ceramic Disk
[Voltage Multipliers]
kilovolt
January 23, 2020, 09:55:05 PM
post Re: Doorknob vs Ceramic Disk
[Voltage Multipliers]
MRMILSTAR
January 23, 2020, 08:39:10 PM
post Re: Universal bus precharge & fan speed controller
[Dual Resonant Solid State Tesla coils (DRSSTC)]
acobaugh
January 23, 2020, 08:37:43 PM
post Re: simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
acobaugh
January 23, 2020, 08:16:02 PM
post simple confusion about UD2.7c LEDs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
justin66
January 23, 2020, 07:48:39 PM
post Re: Bipolar high voltage multiplier project - more than 70cm hot arc discharge
[Voltage Multipliers]
kilovolt
January 23, 2020, 05:07:46 PM
post Re: My 240kv voltage multiplier
[Voltage Multipliers]
kilovolt
January 23, 2020, 05:05:40 PM
post Re: Doorknob vs Ceramic Disk
[Voltage Multipliers]
kilovolt
January 23, 2020, 05:01:27 PM
post WTB [EU]: Cellular Sector Antenna
[Sell / Buy / Trade]
Da_Stier
January 23, 2020, 04:34:34 PM
post Re: My X-Ray Machine
[X-ray]
Agent Smith
January 23, 2020, 03:47:06 PM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
rikkitikkitavi
January 23, 2020, 02:24:07 PM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
kamelryttarn
January 23, 2020, 01:29:01 PM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
rikkitikkitavi
January 23, 2020, 12:45:40 PM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
kamelryttarn
January 23, 2020, 11:38:18 AM
post Re: DIY SMAW welder (stick welding)
[Electronic Circuits]
rikkitikkitavi
January 23, 2020, 10:43:36 AM
post DIY SMAW welder (stick welding)
[Electronic Circuits]
kamelryttarn
January 23, 2020, 08:32:56 AM
post Re: Doorknob vs Ceramic Disk
[Voltage Multipliers]
davekni
January 23, 2020, 06:06:20 AM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
davekni
January 23, 2020, 05:57:18 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal