Error Singular Matrix Spice
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us Electrical Engineering Questions Tags Users Badges Unanswered Ask Question _ Electrical Engineering Stack Exchange is a question and answer site error singular matrix ti 89 for electronics and electrical engineering professionals, students, and enthusiasts. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted comsol error singular matrix up and rise to the top Why does LTSpice say that my “Matrix is singular” for this ideal-transformer circuit? up vote 9 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 play around with lots of different values in order to see if it's a
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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 107118 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 @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? –Russell McMahon Oct 12 '11 at 15:59 add a comment| 2 Answers 2 active oldest votes up vote 10 down vote accepted You need a DC path betwe
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 singular matrix error matlab it (which will be an option.) When the opto is ON, the output should be what does error singular matrix mean OFF (which is controlled by turning off the standby supply reducing consumption to a few microamps), and vice-versa. However, LTspice is giving me
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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. http://electronics.stackexchange.com/questions/20800/why-does-ltspice-say-that-my-matrix-is-singular-for-this-ideal-transformer-cir 2Click to expand... Does anyone know what's wrong? Attached Files: Screenshot-1.png File 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 http://forum.allaboutcircuits.com/threads/ltspice-singular-matrix.45862/ that much easier. #3 Like Reply Nov 20, 2010 #4 tom66 Thread Starter Senior Member May 9, 2009 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 R
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& Smart Home PC-Programmierung PC Hard- & Software Ausbildung & Beruf Offtopic Webseite Artikelübersicht Letzte Änderungen Forum: Analoge Elektronik und Schaltungstechnik Rectifiier LTspice Single - Singular matrix error- Ltspice Forenliste Threadliste Neuer Beitrag Suchen Anmelden Benutzerliste Bildergalerie Hilfe Login Rectifiier LTspice Single - Singular matrix error- Ltspice Autor: Stef (Gast) Datum: 19.04.2011 22:31 Angehängte Dateien: rect.png 6,2 KB, 535 Downloads rectsub.png 6,6 KB, 628 Downloads Bewertung 0 ▲ lesenswert ▼ nicht lesenswert Hallo, Ich hab auch ein Problem in LTspice. Ich möchte einen stinknormalen Brückengleichrichter simulieren. Jedoch kommt von LTspice die Fehlermeldung Singularity Matrix--- check node n001 oder so. Das ganze kam erst als ich den Kondensator in die Schaltung eingebaut habe. Aber was ist denn daran falsch???? gruss Beitrag melden Bearbeiten Thread verschieben Thread sperren Thread löschen Thread mit anderem zusammenführen Markierten Text zitieren Antwort Antwort mit Zitat Re: Rectifiier LTspice Single - Singular matrix error- Ltspice Autor: Helmut S. (helmuts) Datum: 19.04.2011 22:47 Bewertung 0 ▲ lesenswert ▼ nicht lesenswert Mach mal auf der rechten Seite einen R mit 1G gegen Masse an einen der Ausgänge. Beitrag melden Bearbeiten Löschen Markierten Text zitieren Antwort Antwort mit Zitat Re: Rectifiier LTspice Single - Singular matrix error- Ltspice Autor: Helmut S. (helmuts) Datum: 19.04.2011 22:48 Bewertung 0 ▲ lesenswert ▼ nicht lesenswert Sehe gerade du hast zwei ideale Dioden. Ersetze die durch deine Dioden mit dem Modell. Dann gehts auch ohne den extra Widerstand nach Masse. Beitrag melden Bearbeiten Löschen Markierten Text zitieren Antwort Antwort mit Zitat Re: Rectifiier LTspice Single - Singular matrix error- Ltspice Autor: Dan My (luizaranha) Datum: 19.04.2011 22:50 Bewertung 0 ▲ lesenswert ▼ ni