Trying to learn Circuit maker

Ryssen · 14th May 2006, 10:27 PM

Trying to simulate a simple regulator.It works if I connect a battery after the rectifier.It is the trafo I can´t get to work ,and the mains in.how??

sreten · 15th May 2006, 09:18 AM

Hi,

I'm not familiar with CM, but the circuit seems OK.

At a guess I'd say with the battery DC analysis works,
but DC analysis doesn't work with the AC input.

So I'm guessing you need to use AC analysis.

/sreten.

Ryssen · 15th May 2006, 09:58 AM

Well,I get no AC at the rectifier at all.

PM650 · 16th May 2006, 12:48 AM

Perhaps you need to enter a turns ratio for the transformer? Thats about the only thing that I could think of.

Ryssen · 16th May 2006, 09:27 AM

I have now entered the trafo ratio,and if i dissconnect the bridge I get
22v ac out from the trafo,it is when i connect the bridge i get zero.It says timestep to small.

How do I fix that?

powerbecker · 16th May 2006, 11:36 PM

Hi Ryssen,

You can try a 1000k between secondary and ground and /or use more realistic diodes for the bridge,
or You download from here
http://www.linear.com/designtools/so...gistration.jsp
Lt-SwitcherCAD.
Here You find many examples/tutorials:
http://groups.yahoo.com/group/LTspice

Regards
Heinz!

Ryssen · 17th May 2006, 05:55 AM

Didn´t work with the resistors,it´s sommeyhing with the diods.Even tried with one 1N4004,nope!

There is a ac before the diode.

lndm · 17th May 2006, 11:24 AM

Ryssen. I too have had problems with transformers in cm. I don't know what it is. If you remove the transformer and replace it with the sig gen adjusted to what you expect the secondary voltage to be, you'll be right.

If you want to incorporate leakage inductance and DCR, you'll need discreet components.

Ryssen · 17th May 2006, 04:14 PM

If I remove the diode bridge and connect a batteri instead it works,I´ll
be running bateries herafter.

AlexK · 17th May 2006, 06:26 PM

Ryssen,

There is a mistake in the schematic - transformer's primary should NOT be connected to groung.

Hope this helps.

Alex.

15th May 2006, 09:58 AM	#3
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Well,I get no AC at the rectifier at all. __________________ Regards Åke

16th May 2006, 09:27 AM	#5
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	I have now entered the trafo ratio,and if i dissconnect the bridge I get 22v ac out from the trafo,it is when i connect the bridge i get zero.It says timestep to small. How do I fix that? __________________ Regards Åke

17th May 2006, 05:55 AM	#7
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Didn´t work with the resistors,it´s sommeyhing with the diods.Even tried with one 1N4004,nope! There is a ac before the diode. __________________ Regards Åke

17th May 2006, 04:14 PM	#9
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	If I remove the diode bridge and connect a batteri instead it works,I´ll be running bateries herafter. __________________ Regards Åke

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15th May 2006, 09:18 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, I'm not familiar with CM, but the circuit seems OK. At a guess I'd say with the battery DC analysis works, but DC analysis doesn't work with the AC input. So I'm guessing you need to use AC analysis. /sreten.

16th May 2006, 12:48 AM	#4
PM650 diyAudio Member Join Date: Jul 2005 Location: Tennessee	Perhaps you need to enter a turns ratio for the transformer? Thats about the only thing that I could think of.

16th May 2006, 11:36 PM	#6
powerbecker diyAudio Member Join Date: Dec 2004 Location: Berlin	Hi Ryssen, You can try a 1000k between secondary and ground and /or use more realistic diodes for the bridge, or You download from here http://www.linear.com/designtools/so...gistration.jsp Lt-SwitcherCAD. Here You find many examples/tutorials: http://groups.yahoo.com/group/LTspice Regards Heinz!

17th May 2006, 11:24 AM	#8
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	Ryssen. I too have had problems with transformers in cm. I don't know what it is. If you remove the transformer and replace it with the sig gen adjusted to what you expect the secondary voltage to be, you'll be right. If you want to incorporate leakage inductance and DCR, you'll need discreet components.

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