If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Regulated High Voltage PS, 15kV, 200 watts.
Im pondering how to accomplishish this task:
make a Push-Pull ferrite transformer SMPS. This first attempt will be a 15kV, 200 Watt device, which is a prototype for a larger multi-transformer SMPS to be built from the lessons learned with this prototype.
All advice, oppinions and help is wanted.
Purpose: An HV SMPS for Lifter/Ionocraft research.
The specific requirments are as follows : --- 15 kV regulated to within about 5-10% --- 100 kHz transformer freq, with a Push-pull Primary, and at least one secondary of 18-20kV --- each transistor will have a max on time of about 49% --- current monitoring, individual pulse by pulse limit, via primary current transformer. --- Hopefully a 20-22 volt primary conducting 10 or so Amps. --- full flux swing both + and -, thus the secondary must be rectified to HVDC, with a moderate ripple. --- It must operate no-load without killing itself, and be secondary short circuit resistant (occasional arcing, and sparking) --- I have the ability to totally make the transformer, its everything else i need help with. (like the compensation loop circuit and math, and the voltage feedback division circuit.) --- Must use the UC28025 current mode control IC, and have the clock pin preserved for syncing multiples together in the future.
Clarifications: Obviously, the ripple and regulation percentage are closely related, as is the compensation/feedback circuit and math. so the 5-10% number and ripple factor i have left as free as possible early in the design phase of this prototype.
I expect that my HV O-scope probe will be needed for any feedback circuit response and division ratio issues.
Also the IC must be able to SYNC with other IC sections, this also applies to the feedback loop. While no single failure of any module should cuase the system to catastrophically fail. since this is a first attempt, it will not include these syncing or power sharing functions yet, but the final future circiut will.
Datasheets and PDF's : Paralleling power: ]slup207.pdf[/file] TI UC28025: ]uc28023_best.pdf[/file]
Ive really got my work to do on this one. I dont see many examples of HV regulated schematics online. there is an application schematic in the PDF so ill start with that....
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
You probably need more voltage. At least 20 kV. A minimum of 1 mA for a light 2 g "lifter", more in proportion to the desired weight. Apparently more power is required for takeoff. Once the lifter is flying, the power can be reduced. A flyback power supply requires a simpler transformer. It's simple to regulate the HV output with reasonable precision by observing another low-voltage winding, producing a voltage proportional to the HV output.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Antonio wrote ...
You probably need more voltage. At least 20 kV. A minimum of 1 mA for a light 2 g "lifter", more in proportion to the desired weight. Apparently more power is required for takeoff. Once the lifter is flying, the power can be reduced. A flyback power supply requires a simpler transformer. It's simple to regulate the HV output with reasonable precision by observing another low-voltage winding, producing a voltage proportional to the HV output.
As for your extra secondary idea, yeah i was thinking of verifying that it would work, so ill draw up some specs to try it.
As to the higher than 15kV point, yes i realize i need higher voltage for my real testing. But i wanted to make it easier on the prototype and control loop by only requiring 15 kV, later variants will be in the 30-40kV range .
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Regulated High Voltage PS, 15kV, 200 watts.
