Ltspice Error Analysis Failed Matrix Is Singular
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Singular Matrix Check Node Proteus
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Ltspice Node Is Floating
question Anybody can answer The best answers are voted up and rise to the top Why does LTSpice say that my “Matrix is singular” for this ideal-transformer circuit? up vote 11 down vote favorite 2 I'm trying to do find the voltage over R1 in the following circuit, where L1/L2 is an ideal transformer. LTSpice complains that the "Matrix is singular". Why? I've tried to ltspice find node play around with lots of different values in order to see if it's a problem with approximation. The numbers after "AC" are the max amplitude and phase (in degrees). transformer ltspice share|improve this question edited Oct 12 '11 at 21:19 asked Oct 12 '11 at 13:32 Karin 117119 The analysis works fine if I remove R1 (replacing it with a gap). –Karin Oct 12 '11 at 13:33 Can you make L1 and L2 non ideal by a very small amount. Maybe add a milliohm of less. I've had something similar happen a few decades ago :-) –Russell McMahon Oct 12 '11 at 13:51 @LeonHeller: That did it -- thank you very much! –Karin Oct 12 '11 at 13:57 1 @RussellMcMahon: I tried to set their "parallell resistances" to 1m, if that's what you meant. It resulted in a current over R1 on the order 10^-10A. –Karin Oct 12 '11 at 14:01 Is it working? Did the 10M between ccts make it work? If you emove the 10M does it work? If you add parallel R does it wiorK. What current are you getting / expecting? &
Posts Today's Posts 1Next > Nov 20, 2010 #1 tom66 Thread Starter Senior Member May 9, 2009 2,613 213 I am designing a buck regulator LED power supply in LTspice. I'm trying to add an optocoupler on/off switch to it (which will be an option.)
Dynamic Gmin Stepping Failed
When the opto is ON, the output should be OFF (which is controlled by turning off the standby supply reducing consumption to a few microamps), and vice-versa. However, LTspice is giving me odd errors: WARNING: Node N012 is floating. WARNING: Less than two connections to node NC_01. This node is used by S:U4:1. Singular matrix: Check node q5#collector Iteration No. 2 Fatal Error: Singular matrix: check node q5#collector Iteration No. 2Click to expand... Does anyone know what's wrong? Attached Files: Screenshot-1.png File http://electronics.stackexchange.com/questions/20800/why-does-ltspice-say-that-my-matrix-is-singular-for-this-ideal-transformer-cir size: 5.4 KB Views: 349 #1 Like Reply Nov 20, 2010 #2 mik3 Senior Member Feb 4, 2008 4,846 63 Put a ground on V1. #2 Like Reply pfg23 likes this. Nov 20, 2010 #3 retched AAC Fanatic! Dec 5, 2009 5,201 312 That should do it. Post your asc file, as well as any non-standard models. It will make following along that much easier. #3 Like Reply Nov 20, 2010 #4 tom66 Thread Starter Senior Member May 9, 2009 http://forum.allaboutcircuits.com/threads/ltspice-singular-matrix.45862/ 2,613 213 mik3 said: ↑ Put a ground on V1.Click to expand... Okay, but doesn't that make it non-isolated? (I presume this is only a simulation bug/limitation?) retched said: ↑ That should do it. Post your asc file, as well as any non-standard models. It will make following along that much easier.Click to expand... See attached. Attached Files: buck-reg-led.asc File size: 5.1 KB Views: 184 #4 Like Reply Nov 20, 2010 #5 retched AAC Fanatic! Dec 5, 2009 5,201 312 Spice requires a ground reference. It checks to see if there is a ground in the schematic, but doesn't check to see if it is in the proper places. #5 Like Reply Nov 20, 2010 #6 mik3 Senior Member Feb 4, 2008 4,846 63 I am not sure if you can tell spice to use to different grounds. In reality it will work with two isolated grounds but here it needs to have ground every where to work. #6 Like Reply Nov 20, 2010 #7 SgtWookie Expert Jul 17, 2007 22,182 1,728 Tom66, I can't load that .asc file; my LTSpice doesn't like it one bit. Did you upload a shortcut to the .ASC file instead of the actual .asc file? #7 Like Reply Nov 20, 2010 #8 retched AAC Fanatic! Dec 5, 2009 5,201 312 I couldn't get it to load either. Ahh... You uploaded the plot setting file: Code ( (Unknown Language)): Title: * C:\Documents and Settings\Thomas\My Documents\LED driv
Translate This Thread From English to Detect language -- Afrikaans Albanian Arabic Armenian Azerbaijani Basque Belarusian Bengali Bulgarian Catalan http://www.electrondepot.com/cad/spice-error-masseges-2979-.htm Chinese Croatian Czech Danish Dutch English Estonian Filipino Finnish French Galician Georgian German Greek Gujarati Haitian Creole Hebrew Hindi Hungarian Icelandic Indonesian Irish Italian Japanese Kannada Korean Latin Latvian Lithuanian Macedonian Malay Maltese Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swahili Swedish Tamil Telugu Thai Turkish Ukrainian Urdu singular matrix Vietnamese Welsh Yiddish Threaded View Subject AuthorPosted on Spice Error Masseges ali electronic Contact options for registered users 12-14-2004 Re: Spice Error Masseges Jim Thompson12-14-2004 Re: Spice Error Masseges Kevin Aylward12-14-2004 Re: Spice Error Masseges Steve12-16-2004 Re: Spice Error Masseges ali12-16-2004 ali electronic Contact options for registered users posted on December 14, singular matrix check 2004, 10:23 am rate this thread EXCELLENT VERY GOOD GOOD FINE BAD Reportit Reply Save Print Circuit Maker uses spice. What do following messages mean?! Float overflow exception in simulation. Warning: singular matrix:check nodes lakt1#branch and lakt1#branch Warning: source stepping failed doAnalyses: Matrix is singular thanks Other Related Threads LT spice error in »Electronics Design power dissipation in LT Spice in »Electronics Design SPICE results; questions.. in »Electronics Design [Help!!] P-spice Error --> Time step too small.. in »Electronics Design Jim Thompson Contact options for registered users posted on December 14, 2004, 3:52 pm Permalink Reply Save Print Re: Spice Error Masseges You most likely failed to include "ground", a node numbered 0 (zero). Most "Spices" tend to give utterly meaningless error messages... just like Windows ;-) ...Jim Thompson -- |James E.Thompson, P.E. |mens | |Analog Innovations, Inc. | et| We've slightly trimmed the long signature. Click to see the full one. Other Rel