Author Topic: Completed my pulsed power generator  (Read 236 times)

Offline MRMILSTAR

  • High Voltage Experimenter
  • **
  • Posts: 55
  • Karma: +2/-0
  • Cedar Rapids, Iowa
    • View Profile
Completed my pulsed power generator
« on: July 11, 2019, 05:43:31 AM »
After 6 months of low-level effort I have finally finished my pulsed power generator (quarter shrinker, can crusher, disk launcher). I tested it today and it worked perfectly the first time. Currently I am only using it as a quarter shrinker. Here are some pictures. The shrunken quarter is a 6000 joule shot according to the voltmeter.

The pink lines are just 10 foot nylon strings (lanyards) used to trigger the following events:

1. Charge capacitor (charging circuit is disconnected from capacitor by pulling this lanyard)
2. Fire (closes the HV spark gap when this lanyard is pulled)
3. Discharge capacitor (dumps capacitor output into 35K ohm power resistors when this lanyard is pulled)

I do not use any electrical parts to trigger events because I don't trust them at these power levels. I use simple mechanical devices which are triggered by the 3 nylon lanyards. I use large Simpson analog microammeters as voltmeters because they do not require external power and are more readable than digital displays from a distance of 10 feet.

The power supply consists of a 15KV, 60 ma neon sign transformer. Rectification is performed by a full wave bridge rectifier consisting of 8 HV diodes (2 diodes per leg).

My HV firing switch was inspired by Bert Hickman's spark gap switch used in his quarter shrinker. I can get the brass electrodes to as small as 0.5 mm spacing with excellent parallelism for low voltage firing if needed (future disk launcher). It is a simple spring-loaded design which I can cock and then release via a lanyard.

The containment cage is made of steel plates, G10 plates, and HDPE plates. The top, bottom, and two sides are made of 3/8 inch steel. The other 2 sides are made of a sandwich of 3/8 inch G10 and 3/8 inch HDPE. The HDPE facing is intended to be sacrificial and can be easily replaced if it gets too beat up. The lid is held in place by 2 inserted stainless steel rods. The volume of the containment box is 0.67 cubic feet.

The mouse trap switch seen in the pictures is the capacitor bleed switch. The discharge resistor bank consists of seven 5K ohm power resistors in series, each of which is rated for 200 watts. The total resistance is 35K ohms.

The capacitor is an Aerovox Aerostor unit with the following specifications:

1. Maximum voltage = 22 KV
2. Capacitance = 100 uF
3. Maximum voltage reversal = 20%
4. Maximum energy = 24 KJ

The maximum voltage that I intend to use is 15 KV so as to not over-stress the capacitor. This corresponds to 11.25 KJ.
« Last Edit: July 11, 2019, 06:45:02 AM by MRMILSTAR »

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1113
  • Karma: +17/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Completed my pulsed power generator
« Reply #1 on: July 11, 2019, 02:58:13 PM »
Very nice machine you have put together here!

Do you have any links to Bert Hickmanns design for the spark gap?

What is the black cable with a clamp lying on the ground for? Grounded negative rail of the capacitor?

The Discharge voltage meter, is that to get an indication of the voltage reversal? I seem to recall that a way to avoid this is using a thin enough wire for the work coil that it goes open loop before voltage reversal happens.

I only ever tried firing 4 kJ indoor and that was scary, 6kJ is in the same ball park, but at 10+ kJ even the mechanical stiffness of your current path wants to rip itself apart and what is it with that white piece of plastic pipe on the laminated copper bars?

Got any video of it firing?

http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline MRMILSTAR

  • High Voltage Experimenter
  • **
  • Posts: 55
  • Karma: +2/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Completed my pulsed power generator
« Reply #2 on: July 11, 2019, 05:48:27 PM »
Here is a link to Bert Hickman's quarter shrinker. I only had pictures of his spark gap to go by. I have also been communicating with him via E-Mail.

http://www.capturedlightning.com/frames/shrinkergallery.html

The heavy black cable is the ground (earth) wire. I attach it to a ground rod during operation. It is connected to one terminal (negative) of the capacitor and the case.

The discharge meter is dual polarity to allow for the possibility of the capacitor being left in either polarity after voltage reversal. The charging meter is only connected during charging. Prior to firing, the charging  meter is disconnected to avoid damaging it. The discharge meter is only connected when the excess capacitor voltage is to be bled off after firing.

The white piece of plastic is just a flash-over precaution because that conductor dips close to the discharge mouse-trap switch. Its just an odd piece of PVC pipe that I had lying around. I may remove it because I don't like the way that it looks. The heavy conductors (laminated copper bars) are oddly shaped because they are salvaged items from a huge 500 KVA distribution transformer. I used them as-is because the fit was close enough and the price was right (free).

The maximum voltage that I intend to use is 15 KV which corresponds to 11.25 KJ. I don't want to run it any higher so as to not over-stress the capacitor with excessive voltage reversals.

The noise isn't that bad because my containment box is very tight. Its not quite as loud as a pistol. I wouldn't operate it indoors. Outdoors only.
I need to make a video. When I do I will post it.
« Last Edit: July 11, 2019, 05:57:55 PM by MRMILSTAR »

High Voltage Forum

Re: Completed my pulsed power generator
« Reply #2 on: July 11, 2019, 05:48:27 PM »

 


* Recent Topics and Posts

post Re: UD2.7 Gate Signals
[Dual Resonant Solid State Tesla coils]
coilinator
September 17, 2019, 08:24:59 PM
post Re: Blast from the past!
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
MRMILSTAR
September 17, 2019, 08:19:45 PM
post Re: Blast from the past!
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Mads Barnkob
September 17, 2019, 06:53:52 PM
post Blast from the past!
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
MRMILSTAR
September 17, 2019, 05:52:00 PM
post Re: CM300 coil build questions
[Dual Resonant Solid State Tesla coils]
acobaugh
September 17, 2019, 05:00:47 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
davekni
September 17, 2019, 06:48:38 AM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
erdal
September 16, 2019, 11:07:27 PM
post Re: 750W solar offgrid 24V/150Ah battery setup with Victron charger
[Electronic circuits]
johnf
September 16, 2019, 09:48:37 PM
post Re: adventures in homemade flyback bobbins.
[Transformer (ferrite core)]
AlexanderHun
September 16, 2019, 10:42:44 AM
post Re: Offgrid 48V solar to 24V battery setup
[Electronic circuits]
Mads Barnkob
September 16, 2019, 09:40:27 AM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
September 16, 2019, 09:28:43 AM
post Re: Large Ferrite Core with IGBT-Brick Driver
[Transformer (ferrite core)]
Mads Barnkob
September 16, 2019, 09:24:17 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
T3sl4co1l
September 16, 2019, 06:59:12 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
davekni
September 16, 2019, 04:18:26 AM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
davekni
September 16, 2019, 02:49:28 AM
post Re: Large Ferrite Core with IGBT-Brick Driver
[Transformer (ferrite core)]
davekni
September 16, 2019, 02:43:18 AM
post Re: Homemade HV transformer
[Transformer (ferrite core)]
davekni
September 16, 2019, 02:36:17 AM
post Re: adventures in homemade flyback bobbins.
[Transformer (ferrite core)]
davekni
September 16, 2019, 02:26:40 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
September 16, 2019, 01:50:19 AM
post Re: UD2.7 Gate Signals
[Dual Resonant Solid State Tesla coils]
coilinator
September 15, 2019, 08:22:47 PM
post Re: My second DRSSTC
[Dual Resonant Solid State Tesla coils]
erdal
September 15, 2019, 02:09:17 PM
post Re: Homemade HV transformer
[Transformer (ferrite core)]
AlexanderHun
September 15, 2019, 10:39:29 AM
post Re: Homemade HV transformer
[Transformer (ferrite core)]
ElectroXa
September 14, 2019, 07:01:28 PM
post Re: adventures in homemade flyback bobbins.
[Transformer (ferrite core)]
AlexanderHun
September 14, 2019, 06:59:13 PM
post Re: Homemade HV transformer
[Transformer (ferrite core)]
AlexanderHun
September 14, 2019, 06:43:15 PM
post Re: Homemade HV transformer
[Transformer (ferrite core)]
ritaismyconscience
September 14, 2019, 06:35:32 PM
post Homemade HV transformer
[Transformer (ferrite core)]
AlexanderHun
September 14, 2019, 05:05:00 PM
post Re: UD2.7 Gate Signals
[Dual Resonant Solid State Tesla coils]
profdc9
September 14, 2019, 04:50:10 PM
post Re: UD2.7 Gate Signals
[Dual Resonant Solid State Tesla coils]
coilinator
September 14, 2019, 08:42:55 AM
post Re: Transistors good for DRSSTC?
[Dual Resonant Solid State Tesla coils]
ritaismyconscience
September 13, 2019, 05:50:53 AM
post Re: Transistors good for DRSSTC?
[Dual Resonant Solid State Tesla coils]
Max
September 12, 2019, 12:47:03 PM
post Re: Transistors good for DRSSTC?
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
September 12, 2019, 11:07:39 AM
post Re: "karma", "applause/smite" button meaning and use
[General chatting]
Mads Barnkob
September 12, 2019, 11:01:05 AM
post Re: Transistors good for DRSSTC?
[Dual Resonant Solid State Tesla coils]
Hydron
September 12, 2019, 08:44:48 AM
post Transistors good for DRSSTC?
[Dual Resonant Solid State Tesla coils]
ritaismyconscience
September 12, 2019, 05:53:51 AM
post Re: "karma", "applause/smite" button meaning and use
[General chatting]
oneKone
September 12, 2019, 05:37:11 AM
post "karma", "applause/smite" button meaning and use
[General chatting]
MRMILSTAR
September 12, 2019, 05:07:24 AM
post Re: Why did 4HV die??
[General chatting]
oneKone
September 12, 2019, 04:50:24 AM
post Drsstc 4, I'm never stopping
[Dual Resonant Solid State Tesla coils]
oneKone
September 12, 2019, 02:36:00 AM
post Re: Why did 4HV die??
[General chatting]
Hydron
September 12, 2019, 12:34:10 AM
post Re: Why did 4HV die??
[General chatting]
MRMILSTAR
September 11, 2019, 09:29:40 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
MRMILSTAR
September 11, 2019, 09:00:31 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
coilinator
September 11, 2019, 07:54:30 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
freq_out
September 11, 2019, 05:40:14 PM
post Re: SSTC not getting interrupted
[Solid state Tesla coils]
Fumeaux
September 11, 2019, 02:38:40 PM
post Re: SSTC not getting interrupted
[Solid state Tesla coils]
Saattvik24
September 11, 2019, 01:54:59 PM
post Re: Induction Heater schematic modification
[Electronic circuits]
ritaismyconscience
September 11, 2019, 07:48:43 AM
post Re: Using static electricity in the car painting
[Static electricity]
johnf
September 11, 2019, 07:00:03 AM
post Re: Voltage Multipliers keep destroying drivers
[Voltage Multipliers]
MRMILSTAR
September 10, 2019, 10:02:25 PM
post Re: I need a developed circuit for induction heater
[Electronic circuits]
Mads Barnkob
September 10, 2019, 09:14:17 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