I'm trying and want to learn how to use the PWM Switch Model by DR.Vorpérian , both for the voltage mode(VM) and current mode (CM) model. I've read some about the models in "Switched-mode power supplies" by Christophe Basso. However a book can't answer questions, so I hope this thread will be useful on the the way of learning.
Question 1) If I've understood the PWM Switch Model correctly for both the VM and CM case, the model can be directly inserted in any simulation so long it's "rotated" correctly for the current topology, without any modification or calculation necessary because the model is just a linear model of the switch?
Question 2) Which means I can add an infinity amount components outside the so called PWM switch model without the need of modifying the function of the model?
If the answear to the above questions is "Yes" wouldn't it be possible to use the models presented at Bassos webpage which are derived for LTspice?
The model I'm talking about can briefly be found here: https://www.onsemi.com/site/pdf/pcim_basso.pdf
Yes I do wonder if the LTspice models available on bassos webpage is complete. In that way that they can toggle between CCM and DCM operation and do not need any modifications.
The idea off the model is to simulate the SMPS behavior in a much quicker way than actually components to analyze the circuit in a big scope. To be able to look at the transition between CCM & DCM and to analyze the transfer function and make the circuit stable before moving on to a more real component simulation.
My question do need knowledge about the “PWM switch model” to be answered correctly. If I’ve understood the PWM switch model correctly it only need to be derived once to be implemented in any topology, which in that case means that I don’t have to derive every model to be able to simulate a circuit quickly and tweak them. Which you have to do with the state space averaging (SSA) method which requires that you rederive the average model every time you add or take away any component.
So my questions are; if the PWM-switch model is correctly described for LTspice att Basso’s webpage, can they be used directly? Without any derivation? For any topology? for both the CCM & DCM case for the VM & CM-model?