The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: firstname.lastname@example.org (Bob Wilson)
Subject: Re: My flyback experiment is on the web
Date: Tue, 15 Oct 2002 02:48:11 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
References: <3DAA0563.9040507@BOGUS.earthlink.net> <email@example.com>
In article <firstname.lastname@example.org>,
>Assuming your core and windings are indeed of the correct type, a little
>of the trade.......
>Monitor the current waveform as you have been doing and, keeping it at 50%
>cycle, reduce the frequency of operation until you see the sudden rise in
>current on the ramp. This, obviously, coincides with the core running into
>saturation. Now increase the frequency and monitor the efficiency. You
>see a peak in efficiency at some frequency. You could of course caculate
>single parasitic and arrive at the same frequency but I know which method I
>Look at the top of your current waveform...... the short section after the
>gatedrive begins to turn off but before the drain voltage starts to rise. I
>would be asking myself where those huge spikes of current are going. I
>the core is fine at 150KHz but quite lossy at the frequencies indicated in
Saturation is not likely his problem. The use of a cheap and inappropriate
core material (Iron) is more likely it.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup