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From: firstname.lastname@example.org (Gibbo)
Date: 15 Oct 2002 09:07:13 GMT
Organization: AOL, http://www.aol.co.uk
Subject: Re: My flyback experiment is on the web
email@example.com (Bob Wilson) wrote:
>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.
I didn't say it was.
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