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Registered Member #3108
Joined: Thu Aug 12 2010, 05:37PM
Location: Worthing, England
Posts: 72
Hi all,
After weeks of researching and experimenting, I finally got a flyback being driven by an TL494 halfbridge driver working beautifully! It is based on Mads Barnkob's work:
It works well up to 160VDC making large white fiery arcs and the IFRP450's stays relatively cool after short runs.
The problem is when I increase the input voltage to 200VDC, the arcs starts getting a little bit too long for my taste, the MOSFET's heats up more quickly than I wished it to and i don't want to risk burning out my one-and-only 2A variac.
So basically, how do I run this driver at 325VDC without blowing up anything? I want to be able to power it directly off the mains in the UK.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi,
to me it looks like your flyback is getting saturated. How many turns are you using for your primary winding? I found 60 to 80 turns to work well for 325V DC. I used frequency of 66kHz. You'll probably either have to increase your working frequency or increase the number of primary turns.
Registered Member #3108
Joined: Thu Aug 12 2010, 05:37PM
Location: Worthing, England
Posts: 72
Osama Ma'mon wrote ...
change the capacitor to 220uf 400v
Why 220uF capacitor? I am planing to build a 1000uF capacitor bank out of various 450v capacitors I got lying around to get rid most of the buzzing noise to make this driver audio modulated.
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How to run an TL494 halfbridge driver at higher input voltage?
