4-Switch Buck-Boost Converter

Dear Jeanja,

Jeanja said:

NOW, I WANT TO SIMULATE IT USING CADENCE VIRTUOSO BUT IT WON'T OPERATE. CAN YOU HELP ME FIX THIS PROBLEM?

Speaking for myself, you have not provided enough information for me to be able to make any suggestions why your realization of your Matlab/Simulink switching converter in Cadence Virtuoso is not providing your expected response. For example, the performance of any switched-mode converter is highly dependent on the properties of its switches - in your case MOS devices. However, I have no idea what you used to model your MOS devices in your Matlab/Simulink model. Are they ideal? Did you assign any losses to them? I also do not know the parameters of you Virtuoso models - only their geometry - so I could not even compare them to your models in Simulink/Matlab.

I also do not know your inductor parameters - whose losses and capacitances are also critical to a switched-mode converter's operation and efficiency.

My only suggestion to you is that you compare a few parameters of your Matlab/Simulink MOS devices in a simulation with those of a simple Virtuoso circuit schematic of the same MOSFET and start by verifying the two behave similarly and have similar parameters (gm, rds, Cgs, etc..). I would do a similar exercise for your inductors in Matlab/Simulink and Cadence. Once you are satisfied the devices you are using appear to be modeled correctly and similarly, then build up your circuit.

Shawn