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 #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
From my understanding, you're not ready to play with mains.
Try building a simple 555 timer oscillator. Get the pinout of the chip, and then find some schematics for it labeled "555 Timer flyback driver". It's easy enough. Just make sure you understand the pinouts of the MOSFET you use, along with the pinout of the 555 timer.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi platinum
This sounds more like extreme lack of self esteem and depression more than anything else. If you can indentify parts like mosfets and resistors and know how to conenct a flyback to HF output of an SMPS I have too hard time understanding why you are afraid of building a ZVS driver.
One bit of advice - don't build those NE555 flyback drivers, and similar single-switch whatevers. They just plain suck, and one day soon you'll understand why :)
The 555 is fine...sort of...if you use a gate driver between the 555 and the mosfet....
But then again... a tl494 is much better, it's a lot easier to independently control the frequency and duty cycle, but just as with a 555, you need a gate driver IC.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys
Please just don't recommend NE555 flyback drivers for beginner projects, OK? They are jet another source of electronics failure depression and their propagators should be punished for heresy!
Now seriously, once you get an understanding of some SMPS and transformer theory you'll realize how bad it is... Of course it is possible to build a very well working flyback converter once you know this all, though you'll probably want to use a proper current mode control chip like UC3842 (I think there's such a circuit around this forum, buried within depths of unsearchableness)
I can't think of a better flyback driver for starters than a mazzili driver. If you use a current limited 12V supply it's practically impossible that you'll blow it up no matter what you do. Hundreds if not thousands of people already replicated the circuit succesfully.
BTW, I've been pondering the possibility of an offline oscillator based on HOT's, but I wouldn't recommend that for a beginner project at all, it's problematic enough for me already!
Stick to low voltage mosfets such as IRFP260's, 250's, 150's, even IRFZ44 and like will work with up to 18V supply or so.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Marko, I have tried the offline driver with HOTs, but they are just so terribly slow (Tstg of around 7us !!) that the waveform gets greatly distorted and the circuit operates inefficiently.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I mainly want a reliable flyback driver, I've powered flybacks from CFL ballasts, SMPS from PC's and other things, from small PSU's from router, phones, chargers, but never any of them were good.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Platinum wrote ...
I mainly want a reliable flyback driver, I've powered flybacks from CFL ballasts, SMPS from PC's and other things, from small PSU's from router, phones, chargers, but never any of them were good.
The ZVS driver is the way to go for a reliable flyback driver, trust me!
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Platinum wrote ...
I mainly want a reliable flyback driver, I've powered flybacks from CFL ballasts, SMPS from PC's and other things, from small PSU's from router, phones, chargers, but never any of them were good.
The ZVS driver is the way to go for a reliable flyback driver, trust me!
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.
Help with Flyback driver?
They are jet another source of electronics failure depression and their propagators should be punished for heresy!
