Author Topic: DRSSTC impedance  (Read 861 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: 100
  • 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: 243
  • Karma: +7/-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: 1071
  • Karma: +16/-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: adventures in homemade flyback bobbins.
[Transformer (ferrite core)]
ElectroXa
Today at 02:22:09 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
August 19, 2019, 09:08:12 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
August 19, 2019, 02:27:06 PM
post Flashing light prize 2019
[Electronic circuits]
Avalanche
August 19, 2019, 02:12:41 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Hydron
August 19, 2019, 10:44:35 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
August 19, 2019, 07:37:07 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
August 19, 2019, 03:29:24 AM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
erdal
August 18, 2019, 05:05:24 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
August 18, 2019, 01:04:35 PM
post Re: You would think this would be easy to find.
[Spark gap Tesla coils]
thedoc298
August 17, 2019, 11:09:16 PM
post Re: You would think this would be easy to find.
[Spark gap Tesla coils]
thedoc298
August 17, 2019, 11:00:32 PM
post Re: You would think this would be easy to find.
[Spark gap Tesla coils]
Fumeaux
August 17, 2019, 09:44:07 PM
post You would think this would be easy to find.
[Spark gap Tesla coils]
thedoc298
August 17, 2019, 09:01:00 PM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
August 17, 2019, 08:06:42 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Lane
August 17, 2019, 10:45:26 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Lane
August 17, 2019, 06:21:45 AM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
Hydron
August 17, 2019, 12:59:20 AM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
fnordest
August 17, 2019, 12:18:48 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
August 16, 2019, 10:34:46 PM
post Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
[Electronic circuits]
Mads Barnkob
August 16, 2019, 10:26:19 PM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
August 16, 2019, 10:19:18 PM
post Re: [Development] Project of an SSTC driver.
[Solid state Tesla coils]
Mads Barnkob
August 16, 2019, 10:07:31 PM
post Re: Suitable capacitors and switches? 10kV
[Capacitor banks]
T3sl4co1l
August 16, 2019, 09:28:35 PM
post Re: Suitable capacitors and switches? 10kV
[Capacitor banks]
ElectroXa
August 16, 2019, 09:17:04 PM
post Re: ESAB Power TIG 200 Welder Teardown
[Electronic circuits]
T3sl4co1l
August 16, 2019, 09:14:36 PM
post ESAB Power TIG 200 Welder Teardown
[Electronic circuits]
Mads Barnkob
August 16, 2019, 08:03:18 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
August 16, 2019, 01:49:53 PM
post Suitable capacitors and switches? 10kV
[Capacitor banks]
MrFox
August 16, 2019, 12:21:36 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Lane
August 16, 2019, 11:22:45 AM
post Re: Small Phase change build R600a
[General chatting]
DashApple
August 15, 2019, 06:23:40 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
rikkitikkitavi
August 15, 2019, 06:17:55 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Lane
August 15, 2019, 01:51:04 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
August 14, 2019, 07:05:57 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
August 14, 2019, 03:42:34 PM
post Re: Van de Graaf is leaking charge
[Static electricity]
Patric
August 14, 2019, 02:56:49 PM
post Re: Van de Graaf is leaking charge
[Static electricity]
ElectroXa
August 14, 2019, 01:42:21 PM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
erdal
August 14, 2019, 12:53:10 PM
post Van de Graaf is leaking charge
[Static electricity]
Patric
August 14, 2019, 09:22:21 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
August 14, 2019, 04:39:11 AM
post Re: MMC orientation and variac
[Spark gap Tesla coils]
thedoc298
August 13, 2019, 07:10:31 PM
post Re: MMC orientation and variac
[Spark gap Tesla coils]
MRMILSTAR
August 13, 2019, 05:17:23 AM
post MMC orientation and variac
[Spark gap Tesla coils]
thedoc298
August 12, 2019, 09:54:35 PM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
erdal
August 12, 2019, 08:40:16 PM
post Re: Small Phase change build R600a
[General chatting]
Hydron
August 12, 2019, 07:27:23 PM
post Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
[Electronic circuits]
klugesmith
August 12, 2019, 09:18:15 AM
post Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
[Electronic circuits]
shrad
August 12, 2019, 09:06:34 AM
post Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
[Electronic circuits]
klugesmith
August 12, 2019, 09:02:38 AM
post Re: A problem solved with hand tools
[General chatting]
klugesmith
August 12, 2019, 08:29:20 AM
post Re: Ebay [US]: MITSUBISHI CM300 1200V-300A IGBT (30$ a piece)
[Sell / Buy / Trade]
oneKone
August 12, 2019, 05:25:24 AM
post Re: Ebay [US]: MITSUBISHI CM300 1200V-300A IGBT (30$ a piece)
[Sell / Buy / Trade]
acobaugh
August 10, 2019, 08:14:35 PM

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