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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: "Dennis O'Connor" <doconnor@chartermi.net> Newsgroups: rec.aviation.misc,rec.aviation.owning,sci.electronics.design Subject: Re: (Avionics) How can this circuit produce an "inductive surge"? Date: Sun, 29 Sep 2002 13:19:20 -0400 Organization: Posted via Supernews, http://www.supernews.com Message-ID: <upedgokpvfbdb@corp.supernews.com> References: <hv26pu09osj2tvk2js0hgrk2reo059qkpq@4ax.com> <up6nb2h6vsmf03@corp.supernews.com> <bou6puk18s2qkbo47l395rit77sc9qheql@4ax.com> <an00vj$4vs$1@mail.specsol.com> <43cbd38a.0209271648.17ce1e84@posting.google.com> <an3jor$q2a$1@mail.specsol.com> <43cbd38a.0209280616.654f62@posting.google.com> X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 Dan, me boy, I gotta say you would not have gotten a passing grade in the industrial electronics courses I taught, with that answer... Back to the drawing board, guy... Get a copy of the ARRL Ham Radio Handbook... Best freshman level electrical physics and electronics text ever produced... Denny "Dan Thomas" <Dan_Thomas_nospam@yahoo.com> wrote in message news:43cbd38a.0209280616.654f62@posting.google.com... > Jim Pennino <jimp@specsol.com> wrote in message news:<an3jor$q2a$1@mail.specsol.com>... > > In rec.aviation.owning Dan Thomas <Dan_Thomas_nospam@yahoo.com> wrote: > > >> The inductive caused transients from things like turning off the starter > > >> relay can easily be thousands of volts for a short period of time; i.e. > > >> microseconds. > > > > > I once measured the spike off the master solenoid at 600 volts. Some > > > here are saying that the avionics are designed to withstand this; that > > > is likely true. However, if the internal protection isn't working, the > > > pilot is taking his chances. > > > > > > > >> To make matters worse, when you turn off an inductive load such as the > > >> starter relay/solenoid, the polarity of the induced voltage is the opposite > > >> polarity of the applied voltage. > > > > > No, it's the same polarity. An inductor resists an increase in > > > current, and resists any decrease by giving the flow a shove as the > > > field collapses. The result is a spike of the same polarity. The diode > > > across the Cessna solenoids doesn't allow any current flow during > > > normal operation, but shorts the spike. Drawing it on paper makes it > > > clear. > > > > Yes, drawing it on paper makes it quite clear the voltage reverses and > > what happens. > > > > The cathode of the diode is connected to the (normally) positive side of > > the inductor, the anode to the negative side. Under normal operation, the > > diode is back biased and no current flows through it. > > > > When the switch is opened, the voltage across the inductor reverses, the > > diode is now forward biased and limits the voltage to one diode drop, or > > about .7 Volts. The initial magnitude of the current through the diode will > > equal the steady state current that was flowing before the switch was opened. > > > > If the voltage didn't reverse, the diode would never do anything. The diode > > across the inductor is an ordinary diode, not a zener diode or anything > > else. > > > > Without the diode and with an ordinary switch, the voltage instantaneously > > tries to go to infinity (which doesn't happen in the real world, but > > it gets large fast) and at some point the switch contacts arc and you have > > a very large negative voltage across your bus. > > > > If you still don't believe it, get any basic electronics book and look up > > inductive loads and diode protection. I suggest "The Art of Electronics" > > by Horowitz and Hill. > > > > <rest snipped for brevity> > > The operational flow through the solenoid coil is from ground to > the positive. The diode is connected as you say, so there is no flow > through it. At shutdown, the spike flows in the same direction, but > instead of going through the battery it flows through the diode to the > coil's ground terminal and back into the coil. > An inductor wouldn't be an inductor if it did the opposite. > Dan </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>