A transfer function block that has only zeros
A transfer function block that has only zeros
(OP)
I am trying to model a current mode dc/dc converter as shown by Dr Ray Ridley, which requires a block that has a double zero and no poles. (http://www.ridleyengineering.com/downloads/curr.pdf page 9)
The block is H=1+s/(wn*Q)+s^2/(wn^2) where wn and Q are constants and s is the laplace variable. How can I make this block in simulink? The built in functions won't allow more zeros than poles.
The block is H=1+s/(wn*Q)+s^2/(wn^2) where wn and Q are constants and s is the laplace variable. How can I make this block in simulink? The built in functions won't allow more zeros than poles.
RE: A transfer function block that has only zeros
which is at least legal if not very clever.
Cheers
Greg Locock
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RE: A transfer function block that has only zeros
just a thought,
Fe
RE: A transfer function block that has only zeros
You could model the inverse function
Hinv=1/[1+s/(wn*Q)+s^2/(wn^2)]
Then plug Hinv into where it says H in the negative feedback loop here:
http://e
Now you have transfer function:
Y/X = G / [1+G*Hinv]
Make G a really big scalar gain constant so that the 1<< G*Hinv and the denominaotr becomes approximately G*Hinv and
Y/X ~ G / [G*Hinv] = H
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