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regarding bug
ellendula
Member
10-03-2009 03:54 AM
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hi....
i'm facing one problem when i simulating one ckt...i.e,
i'm using the component TS_XFMR2, one primary and two secondary....
i'm giving switching pulses of frequency 15KHz from 555 timer wizard to transformer primary......and i want two isolated identical PWM's......that is why i used two secondaries....
and what ever the pulses i'm getting from the transformer i'm giving to thyristor full bridge converter....
then i'm not getting any output.............
and when i connect switching pulses to the thyristor circuit....
amplitude of switching pulse is changing from 15v to 0.8V
so i'm thinking that because of ground ,i'm getting the problem....
because at the transformer secondary when i'm grounding the return path of each secondary then it is simulating ,otherwise it is
showing error....
this grounding only effecting the output....
so please suggest me:
1. whether i'm using any wrong transformer ..........(i want high frequency transformer)...suppose if i have to use other transformer
...where i can get....
2. how can i get isolated grounds in the multisim.......(if i'm not providing any ground in the return path ...it is showing error...)
so please help me ...i have to complete it .......
i'm facing one problem when i simulating one ckt...i.e,
i'm using the component TS_XFMR2, one primary and two secondary....
i'm giving switching pulses of frequency 15KHz from 555 timer wizard to transformer primary......and i want two isolated identical PWM's......that is why i used two secondaries....
and what ever the pulses i'm getting from the transformer i'm giving to thyristor full bridge converter....
then i'm not getting any output.............
and when i connect switching pulses to the thyristor circuit....
amplitude of switching pulse is changing from 15v to 0.8V
so i'm thinking that because of ground ,i'm getting the problem....
because at the transformer secondary when i'm grounding the return path of each secondary then it is simulating ,otherwise it is
showing error....
this grounding only effecting the output....
so please suggest me:
1. whether i'm using any wrong transformer ..........(i want high frequency transformer)...suppose if i have to use other transformer
...where i can get....
2. how can i get isolated grounds in the multisim.......(if i'm not providing any ground in the return path ...it is showing error...)
so please help me ...i have to complete it .......
_user32
NI Employee (retired)
10-04-2009 02:05 PM
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Try and put a high value resistor between the ground and the isolated side's ground (i.e. non net '0')... try 100M and then reduce to see at what value the thyristor works. If this works, I have added some symbols and methods for creating an isolated ground here:
http://forums.ni.com/ni/board/message?board.id=370&thread.id=6739
Another issue may be that the Thyristor may have a net '0' within the model and this may be incorrectly referencing some voltage in the circuit. This is common for many isolated circuits since net '0' is treated as a universal net - therefore you may need to be careful of how the models on the isolated side are structured.
If this doesn't work, please share the circuit and the group can have a look.
Regards,
Patrick Noonan
Business Development Manager
National Instruments - Electronics Workbench Group
50 Market St.
S. Portland, ME 04106
