TL494 and 5kV power supply / General Science and Electronics / Forums

Welcome

Online

Members Birthdays:

All today's birthdays', congrats!
Capper (60)
cereus (73)
Mcanderson (43)

Next birthdays
11/05 Capper (60)
11/05 cereus (73)
11/05 Mcanderson (43)

Contact

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.

Forums

4hv.org :: Forums :: General Science and Electronics

« Previous topic | Next topic »

TL494 and 5kV power supply

Move Thread

LAN_403

Thomas F

Thu Feb 10 2011, 03:18PM

Registered Member #503 Joined: Sun Nov 19 2006, 06:37PM
Location:
Posts: 59

Hi ,

I am trying to make a 0~5kV variable PS using the TL494. I have attached the schematic in case someone wants to help me out.
The problem I am facing is that,the control is not linear but jerky.Like it shows 4.5kV and then falls down to 3.kV.The voltage also keeps jumping about below 1kV. Is there any error in my circuit ?
I am using 30kHz and set the maximum duty cycle to 20%,since the load is an open circuit except for the feedback divider.Since I need only one feedback loop,I have paralleled the two comparators ( is this ok ?).
In one of the circuits on our website I have seen that the INV pins of the feedback opamps is directed shorted to the
Feedback pin.But the circuits in the appnotes do it through a 51k resistor.What is the right method ?

Thanks
Thomas

Thomas F

Tue Feb 22 2011, 01:47PM

Registered Member #503 Joined: Sun Nov 19 2006, 06:37PM
Location:
Posts: 59

Hi,

Well I managed to get it working as wanted. The glaring error I had made was using a 0~5V as my set point.The TL494 saturates above 3.5V as per the TI appnote.I modified to work at 0~2.5V and now it behaves as wanted.
Also I reduced the 100M in my feedback divider to 10M(1Mx10 chain),which also makes a big improvement.

Thanks
Thomas

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Legal Information