Am Fr, 17.08.2007, 23:08, schrieb Karl Hiramoto:
Hi!
>>>>> Trying to do analyis of a simple inverter with a transformer and keep
>>>>> getting these warnings:
>>>>>
>>>>>
>>>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected
>>>>> to
>>>>> [R3,R2]
>>>>> WARNING: TR1: inserted virtual resistance at node `_net9' connected
>>>>> to
>>>>> [R3,R2]
>>>>>
>>>>> Schematic file is at http://karl.hiramoto.org/qucs/Inverter_PWM1.sch
>>>>>
>>>>> I have QUCS 0.0.12 on gentoo linux
>>>>>
>>>>> Anyone help me figure out how to get around this?
>>>>>
>>>>>
>>>> The warning tells that there is a floating node. The node is
>>>> aobviously
>>>> the one between the two 1 Ohm resistors in the 3rd winding of the
>>>> transformer. The winding is completely floating... Change this and
>>>> you
>>>> get rid of it.
>>>>
>>>> Hope this helps, Stefan.
>>>>
>>>>
>>>>
>>> I tried grounding that point and got the same thing.
>>>
>>
>> I did the same (see attachment) and the warning disappeared.
>>
> I have QUCS 0.0.12 to open the file I opened it in an editor and
> changed 0.0.13 to 0.0.12 . Hopefully that did not corrupt my file.
No it does not.
> In this attachment, I changed the V2 pulsed from 1V to 5V (U=5V)
>
> Starting the simulation, but it hangs. I see that there is a process on
> my system "qucsator" using 100% of the CPU.
The qucsator process is the actual simulation engine.
You can set the rise/fall times (Tr/Tf) of the V2 source to 1u instead of
1ns... Then it should work.
> I tred the nightly snapshot from
> http://qucs.sourceforge.net/download.html but running autogen.sh
> qucs-core i get:
> checking for gperf... /usr/bin/gperf
> checking for admsXml... :
> configure: error: The qucs-core package requires an installed adms.
You can get adms from:
<http://sourceforge.net/projects/mot-adms>
Hope this helps, Stefan.
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