For the control subsystem of the Four-Switch Buck-Boost Converter, may I know what are the functions of vRef, v, FF, and Reset?

Question

Mark Ceasar Cubelo 2023-6-7

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回答： Sabin 2023-6-26

Hello,

I am a Matlab beginner and I want to ask what are vRef, v, FF, and Reset, and their respective functions as part of the Controller of the Four-Switch Buck Boost Converter. Attached is the simulik file of the circuit retrieved from https://www.mathworks.com/help/sps/ug/four-switch-buck-boost-converter-control.html. Thank you!

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Answer 1

Sabin 2023-6-26

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Vref is the reference voltage, v is the measured voltage, FF is the feed-forward value that we may want to add to the output of the voltage controller. Considering the PI controller output u_pi=(Kp+(Ki/s))*(Vref-v) we can add a feed-forward precontrol term to u_pi such that the controller output is u=u_pi+FF. Reset input is used if we want to reset the controller, such that when we switch between Buck and Boost modes.

More insights about this block can be found in the documentation:

https://www.mathworks.com/help/sps/ref/dcdcvoltagecontroller.html

I hope this helps.