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Lead/Lag compensator  lead and lag time to pole and zero locations 
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#1
Apr1310, 08:46 AM

P: 4

Hi,
I am having difficulty understanding how to convert pole and zero locations of a lead lag compensator into lead and lag time and vise versa. I have a digital lead and lag compensator which requests: gain, lead time (min) and lag time (min). However i have the gain zeros and poles of the compensator. If someone can tell me how to do this i would be most grateful. Adam 


#2
Apr1310, 07:08 PM

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P: 41,353

http://en.wikipedia.org/wiki/Bode_plot Although I notice that the concept of leadlag compensation may be treated a bit differently in control theory, compared to the circuit design context that I'm familiar with: http://en.wikipedia.org/wiki/Leadlag_compensator Hope that helps. 


#3
Apr1410, 02:47 AM

P: 4

yes i know that you can draw a bode plot from it to get the phase and gain margins but my specs are in the time domain so I have it in transfer function form like K.(s+zd)(s+zg)/(s+pd)(s+pg) where d is for lead and g is for lag. I don't understand how I can get this lag or lead time from either the bode plot or the root locus.



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