Digital load current feed-forward control method for a dc-dc converter

Author

Chae, S.Y. ; Hyun, B.C. ; Kim, W.S. ; Cho, B.H.

Author_Institution

Dept. of Electr. Eng., Seoul Nat. Univ., Seoul

fYear

2008

fDate

24-28 Feb. 2008

Firstpage

498

Lastpage

502

Abstract

This paper describes a new digital feed-forward control method to enhance the dynamic performance of a dc-dc converter. The feed-forward duty ratio is calculated based on the charge balance of the output capacitor using the load current, and it is combined with the output of the digital PED feedback compensator. The feed-forward duty ratio propagates to the consecutive switching cycles during the load transient interval to immediately supply the required energy. The propagation length is decided by comparing the feed-forward duty ratio with the switching period. The performance improvement of the proposed digital control method is experimentally verified on a 200 W buck dc-dc converter.

Keywords

DC-DC power convertors; digital control; electric current control; feedback; feedforward; three-term control; buck dc-dc converter; digital PID feedback compensator; digital load current feed-forward control method; feed-forward duty ratio; output capacitor; power 200 W; Bandwidth; Capacitors; DC-DC power converters; Digital control; Feedforward systems; Linear feedback control systems; Plasma displays; Switches; Three-term control; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE

Conference_Location

Austin, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-1873-2

Electronic_ISBN

1048-2334

Type

conf

DOI

10.1109/APEC.2008.4522767

Filename

4522767