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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: nico@nctdevpuntnl.niks (Nico Coesel) Newsgroups: sci.electronics.design Subject: Re: My flyback experiment is on the web Date: Mon, 14 Oct 2002 09:58:53 GMT Organization: NCT Message-ID: <3daa93b3.10091420@news.cistron.nl> References: <3DAA0563.9040507@BOGUS.earthlink.net> NNTP-Posting-Host: ipd50a9318.speed.planet.nl NNTP-Posting-Date: Mon, 14 Oct 2002 10:00:33 +0000 (UTC) X-Newsreader: Forte Free Agent 1.21/32.243 Chris Carlen <crobc@BOGUS.earthlink.net> wrote: >Hi folks: > >Here is the URL to my web page showing the results of my most recent >experiments with a flyback converter. I still haven't gotten a PWM chip >hooked up yet, as my first goal was to buy some inductors that look like >they are designed for switching supplies, and see if they'd work better >than the hand wound transformer I made from a PC power supply core. > >Actually, the inductor seems a bit worse :-( > >All the details are on the web page. > >http://home.earthlink.net/~crobc/flyback/flyback.html > >My main question is why does the inductor get so warm? I figured I >wasn't really pushing it too hard, so it shouldn't loose much power. >but it seems most of my losses are occurring in the inductor. I was >hoping to avoid complex topologies such as a two transistor flyback, >which requires a transformer, but lends itself to easily shunting the >remaining core energy back to the input rail. Can that be done with the >simple flyback that I am working with? I figured I could get 75% or >better, so I'm not really far off. But I don't like heating the >inductor, and I want to push up the power another 25% from what I'm >testing at before I finish. > >I have a smaller inductor, and a larger one too, but all of the toroidal >type, designed for 150kHz switchers. > >Comments appreciated on what steps I might take to make this simple >circuit move in the direction of something worth committing to FR-4. Strange; I've designed a similar converter (48V in, 168V / 100mA @100kHz) but didn't have problems with the inductors. I've used 2 newport power filtering 100uH inductors in series (didn't have 200uH at hand). I see there is also some ringing in your circuit. Did you try to put a small snubber accross the drain and ground? Did you also consider simulating the circuit? -- Reply to nico@nctdevpuntnl (punt=.) </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>