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Old 09-30-2009, 05:24 PM
Nick29 Nick29 is offline
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Exclamation Thyristor firing angle in multisim or Pspice

Hi,

I am trying to simulate a single phase semi converter in multisim.
I can't work out what to use as the trigger for the thyristors.

What do i use as the trigger and also how do you set the firing angle for a thyristor to eg 30 60?
If it is simpler to do it in Pspice i could use that.

Thanks,
Nick
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Old 11-13-2009, 11:05 AM
fly-boy fly-boy is offline
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Hi!

U have to send a pulse signal with a certain pulse width duration in order to activate the thyristor. U can set ur firing angle by delaying the pulse signal so as to match the required angle corresponding to ur source voltage. I guess ur using an ac source n i suppose u know its frequency, u can find its time period, T.

2pi = T , in case α = 30 = pi/6

Delay time of pulse signal, DT = T/12

There you go firing angle set!

Actually im doing the same simulations right now, but im just getting started with pspice n its driving me crazy. Lazy me waited for the end of the semester to complete my simulations and the dead line expired 1 minute ago! I should figure out my way thru pspice during the weekend and discretely slide my report into the lab 1st hour Monday before the professor comes to collect them :P

For the pulse signal use "VPULSE".

Last edited by fly-boy; 11-13-2009 at 02:33 PM.
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