Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

why PI compensator in Boost Feedback Control

Status
Not open for further replies.
M

mengghee

Full Member level 3
Joined
Nov 29, 2005
Messages
163
Helped
8
Reputation
16
Reaction score
5
Trophy points
1,298
Location
United Kingdom
Activity points
3,105
pi compensator

I am just wondering why do we need a pi compensator in boost control scheme. In Voltage control mode ? thank you.
 

boost feedback control

Typically PI is not enough in Boost DC/DC. Perhaps unless you set the dominant pole way inside (close to DC), and have a small bandwidth. The power train pole and right half plane zero are just too difficult to handle since they are functions of Vout/Vin, L & C, which means the compensation can be difficult to be cancelled off.
 

    M

    mengghee

    Points: 2
    Helpful Answer Positive Rating
compensator for boost

Typically PI is not enough in Boost DC/DC. Perhaps unless you set the dominant pole way inside (close to DC), and have a small bandwidth. The power train pole and right half plane zero are just too difficult to handle since they are functions of Vout/Vin, L & C, which means the compensation can be difficult to be cancelled off.
Click to expand...
hoonsk,

forgive my newbieness... haha but what is the dominant pole ? and what bandwidth ? power train pole and right half plane zero ? i am very poor in control system.

regards,
mengghee
 

Dominant pole is the pole you have (or set) at the lowest frequency. You want to design it to have good phase margin. I think it would be good if you can refer to some info from textbook...as my explanations are not (obviously) as good as theirs. I recommend "Fundamentals of Power Electronics" by Erickson, the book says everything I mentioned, plus much more, and with great diagrams to illustrate the points.

mengghee said:
Typically PI is not enough in Boost DC/DC. Perhaps unless you set the dominant pole way inside (close to DC), and have a small bandwidth. The power train pole and right half plane zero are just too difficult to handle since they are functions of Vout/Vin, L & C, which means the compensation can be difficult to be cancelled off.
Click to expand...
hoonsk,

forgive my newbieness... haha but what is the dominant pole ? and what bandwidth ? power train pole and right half plane zero ? i am very poor in control system.

regards,
mengghee
Click to expand...
 

    M

    mengghee

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top